diff options
| -rw-r--r-- | src/process.c | 3 | ||||
| -rw-r--r-- | src/process.c-dl | 4976 |
2 files changed, 4978 insertions, 1 deletions
diff --git a/src/process.c b/src/process.c index 71e244fc7f..9fe2c5af94 100644 --- a/src/process.c +++ b/src/process.c @@ -1023,7 +1023,6 @@ static Lisp_Object start_process_unwind (); DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0, "Start a program in a subprocess. Return the process object for it.\n\ -Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\ NAME is name for process. It is modified if necessary to make it unique.\n\ BUFFER is the buffer or (buffer-name) to associate with the process.\n\ Process output goes at end of that buffer, unless you specify\n\ @@ -2835,6 +2834,7 @@ read_process_output_error_handler (error) Vinhibit_quit = Qt; update_echo_area (); Fsleep_for (make_number (2), Qnil); + return Qt; } /* Read pending output from the process channel, @@ -4263,6 +4263,7 @@ exec_sentinel_error_handler (error) Vinhibit_quit = Qt; update_echo_area (); Fsleep_for (make_number (2), Qnil); + return Qt; } static void diff --git a/src/process.c-dl b/src/process.c-dl new file mode 100644 index 0000000000..58d2518016 --- /dev/null +++ b/src/process.c-dl @@ -0,0 +1,4976 @@ +/* Asynchronous subprocess control for GNU Emacs. + Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 98, 1999 + Free Software Foundation, Inc. + +This file is part of GNU Emacs. + +GNU Emacs is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Emacs is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Emacs; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + + +#define _GNU_SOURCE /* to get strsignal declared with glibc 2 */ +#include <config.h> +#include <signal.h> + +/* This file is split into two parts by the following preprocessor + conditional. The 'then' clause contains all of the support for + asynchronous subprocesses. The 'else' clause contains stub + versions of some of the asynchronous subprocess routines that are + often called elsewhere in Emacs, so we don't have to #ifdef the + sections that call them. */ + + +#ifdef subprocesses + +#include <stdio.h> +#include <errno.h> +#include <setjmp.h> +#include <sys/types.h> /* some typedefs are used in sys/file.h */ +#include <sys/file.h> +#include <sys/stat.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#ifdef WINDOWSNT +#include <stdlib.h> +#include <fcntl.h> +#endif /* not WINDOWSNT */ + +#ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */ +#include <sys/socket.h> +#include <netdb.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#ifdef NEED_NET_ERRNO_H +#include <net/errno.h> +#endif /* NEED_NET_ERRNO_H */ +#endif /* HAVE_SOCKETS */ + +/* TERM is a poor-man's SLIP, used on GNU/Linux. */ +#ifdef TERM +#include <client.h> +#endif + +/* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */ +#ifdef HAVE_BROKEN_INET_ADDR +#define IN_ADDR struct in_addr +#define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1) +#else +#define IN_ADDR unsigned long +#define NUMERIC_ADDR_ERROR (numeric_addr == -1) +#endif + +#if defined(BSD_SYSTEM) || defined(STRIDE) +#include <sys/ioctl.h> +#if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5) +#include <fcntl.h> +#endif /* HAVE_PTYS and no O_NDELAY */ +#endif /* BSD_SYSTEM || STRIDE */ + +#ifdef BROKEN_O_NONBLOCK +#undef O_NONBLOCK +#endif /* BROKEN_O_NONBLOCK */ + +#ifdef NEED_BSDTTY +#include <bsdtty.h> +#endif + +#ifdef IRIS +#include <sys/sysmacros.h> /* for "minor" */ +#endif /* not IRIS */ + +#include "systime.h" +#include "systty.h" + +#include "lisp.h" +#include "window.h" +#include "buffer.h" +#include "charset.h" +#include "coding.h" +#include "process.h" +#include "termhooks.h" +#include "termopts.h" +#include "commands.h" +#include "frame.h" +#include "blockinput.h" +#include "keyboard.h" +#include "dispextern.h" +#include "composite.h" +#include "atimer.h" + +#define max(a, b) ((a) > (b) ? (a) : (b)) + +Lisp_Object Qprocessp; +Lisp_Object Qrun, Qstop, Qsignal, Qopen, Qclosed; +Lisp_Object Qlast_nonmenu_event; +/* Qexit is declared and initialized in eval.c. */ + +/* a process object is a network connection when its childp field is neither + Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */ + +#ifdef HAVE_SOCKETS +#define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp)) +#else +#define NETCONN_P(p) 0 +#endif /* HAVE_SOCKETS */ + +/* Define first descriptor number available for subprocesses. */ +#ifdef VMS +#define FIRST_PROC_DESC 1 +#else /* Not VMS */ +#define FIRST_PROC_DESC 3 +#endif + +/* Define SIGCHLD as an alias for SIGCLD. There are many conditionals + testing SIGCHLD. */ + +#if !defined (SIGCHLD) && defined (SIGCLD) +#define SIGCHLD SIGCLD +#endif /* SIGCLD */ + +#include "syssignal.h" + +#include "syswait.h" + +extern void set_waiting_for_input P_ ((EMACS_TIME *)); + +extern int errno; +#ifdef VMS +extern char *sys_errlist[]; +#endif + +#ifndef HAVE_H_ERRNO +extern int h_errno; +#endif + +/* t means use pty, nil means use a pipe, + maybe other values to come. */ +static Lisp_Object Vprocess_connection_type; + +#ifdef SKTPAIR +#ifndef HAVE_SOCKETS +#include <sys/socket.h> +#endif +#endif /* SKTPAIR */ + +/* These next two vars are non-static since sysdep.c uses them in the + emulation of `select'. */ +/* Number of events of change of status of a process. */ +int process_tick; +/* Number of events for which the user or sentinel has been notified. */ +int update_tick; + +#include "sysselect.h" + +extern int keyboard_bit_set P_ ((SELECT_TYPE *)); + +/* If we support a window system, turn on the code to poll periodically + to detect C-g. It isn't actually used when doing interrupt input. */ +#ifdef HAVE_WINDOW_SYSTEM +#define POLL_FOR_INPUT +#endif + +/* Mask of bits indicating the descriptors that we wait for input on. */ + +static SELECT_TYPE input_wait_mask; + +/* Mask that excludes keyboard input descriptor (s). */ + +static SELECT_TYPE non_keyboard_wait_mask; + +/* Mask that excludes process input descriptor (s). */ + +static SELECT_TYPE non_process_wait_mask; + +/* The largest descriptor currently in use for a process object. */ +static int max_process_desc; + +/* The largest descriptor currently in use for keyboard input. */ +static int max_keyboard_desc; + +/* Nonzero means delete a process right away if it exits. */ +static int delete_exited_processes; + +/* Indexed by descriptor, gives the process (if any) for that descriptor */ +Lisp_Object chan_process[MAXDESC]; + +/* Alist of elements (NAME . PROCESS) */ +Lisp_Object Vprocess_alist; + +/* Buffered-ahead input char from process, indexed by channel. + -1 means empty (no char is buffered). + Used on sys V where the only way to tell if there is any + output from the process is to read at least one char. + Always -1 on systems that support FIONREAD. */ + +/* Don't make static; need to access externally. */ +int proc_buffered_char[MAXDESC]; + +/* Table of `struct coding-system' for each process. */ +static struct coding_system *proc_decode_coding_system[MAXDESC]; +static struct coding_system *proc_encode_coding_system[MAXDESC]; + +static Lisp_Object get_process (); + +extern EMACS_TIME timer_check (); +extern int timers_run; + +/* Maximum number of bytes to send to a pty without an eof. */ +static int pty_max_bytes; + +extern Lisp_Object Vfile_name_coding_system, Vdefault_file_name_coding_system; + +#ifdef HAVE_PTYS +/* The file name of the pty opened by allocate_pty. */ + +static char pty_name[24]; +#endif + +/* Compute the Lisp form of the process status, p->status, from + the numeric status that was returned by `wait'. */ + +Lisp_Object status_convert (); + +void +update_status (p) + struct Lisp_Process *p; +{ + union { int i; WAITTYPE wt; } u; + u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16); + p->status = status_convert (u.wt); + p->raw_status_low = Qnil; + p->raw_status_high = Qnil; +} + +/* Convert a process status word in Unix format to + the list that we use internally. */ + +Lisp_Object +status_convert (w) + WAITTYPE w; +{ + if (WIFSTOPPED (w)) + return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil)); + else if (WIFEXITED (w)) + return Fcons (Qexit, Fcons (make_number (WRETCODE (w)), + WCOREDUMP (w) ? Qt : Qnil)); + else if (WIFSIGNALED (w)) + return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)), + WCOREDUMP (w) ? Qt : Qnil)); + else + return Qrun; +} + +/* Given a status-list, extract the three pieces of information + and store them individually through the three pointers. */ + +void +decode_status (l, symbol, code, coredump) + Lisp_Object l; + Lisp_Object *symbol; + int *code; + int *coredump; +{ + Lisp_Object tem; + + if (SYMBOLP (l)) + { + *symbol = l; + *code = 0; + *coredump = 0; + } + else + { + *symbol = XCAR (l); + tem = XCDR (l); + *code = XFASTINT (XCAR (tem)); + tem = XCDR (tem); + *coredump = !NILP (tem); + } +} + +/* Return a string describing a process status list. */ + +Lisp_Object +status_message (status) + Lisp_Object status; +{ + Lisp_Object symbol; + int code, coredump; + Lisp_Object string, string2; + + decode_status (status, &symbol, &code, &coredump); + + if (EQ (symbol, Qsignal) || EQ (symbol, Qstop)) + { + char *signame; + synchronize_system_messages_locale (); + signame = strsignal (code); + if (signame == 0) + signame = "unknown"; + string = build_string (signame); + string2 = build_string (coredump ? " (core dumped)\n" : "\n"); + XSTRING (string)->data[0] = DOWNCASE (XSTRING (string)->data[0]); + return concat2 (string, string2); + } + else if (EQ (symbol, Qexit)) + { + if (code == 0) + return build_string ("finished\n"); + string = Fnumber_to_string (make_number (code)); + string2 = build_string (coredump ? " (core dumped)\n" : "\n"); + return concat2 (build_string ("exited abnormally with code "), + concat2 (string, string2)); + } + else + return Fcopy_sequence (Fsymbol_name (symbol)); +} + +#ifdef HAVE_PTYS + +/* Open an available pty, returning a file descriptor. + Return -1 on failure. + The file name of the terminal corresponding to the pty + is left in the variable pty_name. */ + +int +allocate_pty () +{ + struct stat stb; + register int c, i; + int fd; + + /* Some systems name their pseudoterminals so that there are gaps in + the usual sequence - for example, on HP9000/S700 systems, there + are no pseudoterminals with names ending in 'f'. So we wait for + three failures in a row before deciding that we've reached the + end of the ptys. */ + int failed_count = 0; + +#ifdef PTY_ITERATION + PTY_ITERATION +#else + for (c = FIRST_PTY_LETTER; c <= 'z'; c++) + for (i = 0; i < 16; i++) +#endif + { +#ifdef PTY_NAME_SPRINTF + PTY_NAME_SPRINTF +#else + sprintf (pty_name, "/dev/pty%c%x", c, i); +#endif /* no PTY_NAME_SPRINTF */ + +#ifdef PTY_OPEN + PTY_OPEN; +#else /* no PTY_OPEN */ +#ifdef IRIS + /* Unusual IRIS code */ + *ptyv = emacs_open ("/dev/ptc", O_RDWR | O_NDELAY, 0); + if (fd < 0) + return -1; + if (fstat (fd, &stb) < 0) + return -1; +#else /* not IRIS */ + if (stat (pty_name, &stb) < 0) + { + failed_count++; + if (failed_count >= 3) + return -1; + } + else + failed_count = 0; +#ifdef O_NONBLOCK + fd = emacs_open (pty_name, O_RDWR | O_NONBLOCK, 0); +#else + fd = emacs_open (pty_name, O_RDWR | O_NDELAY, 0); +#endif +#endif /* not IRIS */ +#endif /* no PTY_OPEN */ + + if (fd >= 0) + { + /* check to make certain that both sides are available + this avoids a nasty yet stupid bug in rlogins */ +#ifdef PTY_TTY_NAME_SPRINTF + PTY_TTY_NAME_SPRINTF +#else + sprintf (pty_name, "/dev/tty%c%x", c, i); +#endif /* no PTY_TTY_NAME_SPRINTF */ +#ifndef UNIPLUS + if (access (pty_name, 6) != 0) + { + emacs_close (fd); +#if !defined(IRIS) && !defined(__sgi) + continue; +#else + return -1; +#endif /* IRIS */ + } +#endif /* not UNIPLUS */ + setup_pty (fd); + return fd; + } + } + return -1; +} +#endif /* HAVE_PTYS */ + +Lisp_Object +make_process (name) + Lisp_Object name; +{ + struct Lisp_Vector *vec; + register Lisp_Object val, tem, name1; + register struct Lisp_Process *p; + char suffix[10]; + register int i; + + vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct Lisp_Process)); + for (i = 0; i < VECSIZE (struct Lisp_Process); i++) + vec->contents[i] = Qnil; + vec->size = VECSIZE (struct Lisp_Process); + p = (struct Lisp_Process *)vec; + + XSETINT (p->infd, -1); + XSETINT (p->outfd, -1); + XSETFASTINT (p->pid, 0); + XSETFASTINT (p->tick, 0); + XSETFASTINT (p->update_tick, 0); + p->raw_status_low = Qnil; + p->raw_status_high = Qnil; + p->status = Qrun; + p->mark = Fmake_marker (); + + /* If name is already in use, modify it until it is unused. */ + + name1 = name; + for (i = 1; ; i++) + { + tem = Fget_process (name1); + if (NILP (tem)) break; + sprintf (suffix, "<%d>", i); + name1 = concat2 (name, build_string (suffix)); + } + name = name1; + p->name = name; + XSETPROCESS (val, p); + Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist); + return val; +} + +void +remove_process (proc) + register Lisp_Object proc; +{ + register Lisp_Object pair; + + pair = Frassq (proc, Vprocess_alist); + Vprocess_alist = Fdelq (pair, Vprocess_alist); + + deactivate_process (proc); +} + +DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0, + "Return t if OBJECT is a process.") + (object) + Lisp_Object object; +{ + return PROCESSP (object) ? Qt : Qnil; +} + +DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0, + "Return the process named NAME, or nil if there is none.") + (name) + register Lisp_Object name; +{ + if (PROCESSP (name)) + return name; + CHECK_STRING (name, 0); + return Fcdr (Fassoc (name, Vprocess_alist)); +} + +DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, + "Return the (or a) process associated with BUFFER.\n\ +BUFFER may be a buffer or the name of one.") + (buffer) + register Lisp_Object buffer; +{ + register Lisp_Object buf, tail, proc; + + if (NILP (buffer)) return Qnil; + buf = Fget_buffer (buffer); + if (NILP (buf)) return Qnil; + + for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) + { + proc = Fcdr (Fcar (tail)); + if (PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf)) + return proc; + } + return Qnil; +} + +/* This is how commands for the user decode process arguments. It + accepts a process, a process name, a buffer, a buffer name, or nil. + Buffers denote the first process in the buffer, and nil denotes the + current buffer. */ + +static Lisp_Object +get_process (name) + register Lisp_Object name; +{ + register Lisp_Object proc, obj; + if (STRINGP (name)) + { + obj = Fget_process (name); + if (NILP (obj)) + obj = Fget_buffer (name); + if (NILP (obj)) + error ("Process %s does not exist", XSTRING (name)->data); + } + else if (NILP (name)) + obj = Fcurrent_buffer (); + else + obj = name; + + /* Now obj should be either a buffer object or a process object. + */ + if (BUFFERP (obj)) + { + proc = Fget_buffer_process (obj); + if (NILP (proc)) + error ("Buffer %s has no process", XSTRING (XBUFFER (obj)->name)->data); + } + else + { + CHECK_PROCESS (obj, 0); + proc = obj; + } + return proc; +} + +DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0, + "Delete PROCESS: kill it and forget about it immediately.\n\ +PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ +nil, indicating the current buffer's process.") + (process) + register Lisp_Object process; +{ + process = get_process (process); + XPROCESS (process)->raw_status_low = Qnil; + XPROCESS (process)->raw_status_high = Qnil; + if (NETCONN_P (process)) + { + XPROCESS (process)->status = Fcons (Qexit, Fcons (make_number (0), Qnil)); + XSETINT (XPROCESS (process)->tick, ++process_tick); + } + else if (XINT (XPROCESS (process)->infd) >= 0) + { + Fkill_process (process, Qnil); + /* Do this now, since remove_process will make sigchld_handler do nothing. */ + XPROCESS (process)->status + = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil)); + XSETINT (XPROCESS (process)->tick, ++process_tick); + status_notify (); + } + remove_process (process); + return Qnil; +} + +DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0, + "Return the status of PROCESS.\n\ +The returned value is one of the following symbols:\n\ +run -- for a process that is running.\n\ +stop -- for a process stopped but continuable.\n\ +exit -- for a process that has exited.\n\ +signal -- for a process that has got a fatal signal.\n\ +open -- for a network stream connection that is open.\n\ +closed -- for a network stream connection that is closed.\n\ +nil -- if arg is a process name and no such process exists.\n\ +PROCESS may be a process, a buffer, the name of a process, or\n\ +nil, indicating the current buffer's process.") + (process) + register Lisp_Object process; +{ + register struct Lisp_Process *p; + register Lisp_Object status; + + if (STRINGP (process)) + process = Fget_process (process); + else + process = get_process (process); + + if (NILP (process)) + return process; + + p = XPROCESS (process); + if (!NILP (p->raw_status_low)) + update_status (p); + status = p->status; + if (CONSP (status)) + status = XCAR (status); + if (NETCONN_P (process)) + { + if (EQ (status, Qrun)) + status = Qopen; + else if (EQ (status, Qexit)) + status = Qclosed; + } + return status; +} + +DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status, + 1, 1, 0, + "Return the exit status of PROCESS or the signal number that killed it.\n\ +If PROCESS has not yet exited or died, return 0.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + if (!NILP (XPROCESS (process)->raw_status_low)) + update_status (XPROCESS (process)); + if (CONSP (XPROCESS (process)->status)) + return XCAR (XCDR (XPROCESS (process)->status)); + return make_number (0); +} + +DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0, + "Return the process id of PROCESS.\n\ +This is the pid of the Unix process which PROCESS uses or talks to.\n\ +For a network connection, this value is nil.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->pid; +} + +DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0, + "Return the name of PROCESS, as a string.\n\ +This is the name of the program invoked in PROCESS,\n\ +possibly modified to make it unique among process names.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->name; +} + +DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0, + "Return the command that was executed to start PROCESS.\n\ +This is a list of strings, the first string being the program executed\n\ +and the rest of the strings being the arguments given to it.\n\ +For a non-child channel, this is nil.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->command; +} + +DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0, + "Return the name of the terminal PROCESS uses, or nil if none.\n\ +This is the terminal that the process itself reads and writes on,\n\ +not the name of the pty that Emacs uses to talk with that terminal.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->tty_name; +} + +DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer, + 2, 2, 0, + "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).") + (process, buffer) + register Lisp_Object process, buffer; +{ + CHECK_PROCESS (process, 0); + if (!NILP (buffer)) + CHECK_BUFFER (buffer, 1); + XPROCESS (process)->buffer = buffer; + return buffer; +} + +DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer, + 1, 1, 0, + "Return the buffer PROCESS is associated with.\n\ +Output from PROCESS is inserted in this buffer unless PROCESS has a filter.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->buffer; +} + +DEFUN ("process-mark", Fprocess_mark, Sprocess_mark, + 1, 1, 0, + "Return the marker for the end of the last output from PROCESS.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->mark; +} + +DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter, + 2, 2, 0, + "Give PROCESS the filter function FILTER; nil means no filter.\n\ +t means stop accepting output from the process.\n\ +When a process has a filter, each time it does output\n\ +the entire string of output is passed to the filter.\n\ +The filter gets two arguments: the process and the string of output.\n\ +If the process has a filter, its buffer is not used for output.") + (process, filter) + register Lisp_Object process, filter; +{ + CHECK_PROCESS (process, 0); + if (EQ (filter, Qt)) + { + FD_CLR (XINT (XPROCESS (process)->infd), &input_wait_mask); + FD_CLR (XINT (XPROCESS (process)->infd), &non_keyboard_wait_mask); + } + else if (EQ (XPROCESS (process)->filter, Qt)) + { + FD_SET (XINT (XPROCESS (process)->infd), &input_wait_mask); + FD_SET (XINT (XPROCESS (process)->infd), &non_keyboard_wait_mask); + } + XPROCESS (process)->filter = filter; + return filter; +} + +DEFUN ("process-filter", Fprocess_filter, Sprocess_filter, + 1, 1, 0, + "Returns the filter function of PROCESS; nil if none.\n\ +See `set-process-filter' for more info on filter functions.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->filter; +} + +DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel, + 2, 2, 0, + "Give PROCESS the sentinel SENTINEL; nil for none.\n\ +The sentinel is called as a function when the process changes state.\n\ +It gets two arguments: the process, and a string describing the change.") + (process, sentinel) + register Lisp_Object process, sentinel; +{ + CHECK_PROCESS (process, 0); + XPROCESS (process)->sentinel = sentinel; + return sentinel; +} + +DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel, + 1, 1, 0, + "Return the sentinel of PROCESS; nil if none.\n\ +See `set-process-sentinel' for more info on sentinels.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->sentinel; +} + +DEFUN ("set-process-window-size", Fset_process_window_size, + Sset_process_window_size, 3, 3, 0, + "Tell PROCESS that it has logical window size HEIGHT and WIDTH.") + (process, height, width) + register Lisp_Object process, height, width; +{ + CHECK_PROCESS (process, 0); + CHECK_NATNUM (height, 0); + CHECK_NATNUM (width, 0); + if (set_window_size (XINT (XPROCESS (process)->infd), + XINT (height), XINT (width)) <= 0) + return Qnil; + else + return Qt; +} + +DEFUN ("set-process-inherit-coding-system-flag", + Fset_process_inherit_coding_system_flag, + Sset_process_inherit_coding_system_flag, 2, 2, 0, + "Determine whether buffer of PROCESS will inherit coding-system.\n\ +If the second argument FLAG is non-nil, then the variable\n\ +`buffer-file-coding-system' of the buffer associated with PROCESS\n\ +will be bound to the value of the coding system used to decode\n\ +the process output.\n\ +\n\ +This is useful when the coding system specified for the process buffer\n\ +leaves either the character code conversion or the end-of-line conversion\n\ +unspecified, or if the coding system used to decode the process output\n\ +is more appropriate for saving the process buffer.\n\ +\n\ +Binding the variable `inherit-process-coding-system' to non-nil before\n\ +starting the process is an alternative way of setting the inherit flag\n\ +for the process which will run.") + (process, flag) + register Lisp_Object process, flag; +{ + CHECK_PROCESS (process, 0); + XPROCESS (process)->inherit_coding_system_flag = flag; + return flag; +} + +DEFUN ("process-inherit-coding-system-flag", + Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag, + 1, 1, 0, + "Return the value of inherit-coding-system flag for PROCESS.\n\ +If this flag is t, `buffer-file-coding-system' of the buffer\n\ +associated with PROCESS will inherit the coding system used to decode\n\ +the process output.") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->inherit_coding_system_flag; +} + +DEFUN ("process-kill-without-query", Fprocess_kill_without_query, + Sprocess_kill_without_query, 1, 2, 0, + "Say no query needed if PROCESS is running when Emacs is exited.\n\ +Optional second argument if non-nil says to require a query.\n\ +Value is t if a query was formerly required.") + (process, value) + register Lisp_Object process, value; +{ + Lisp_Object tem; + + CHECK_PROCESS (process, 0); + tem = XPROCESS (process)->kill_without_query; + XPROCESS (process)->kill_without_query = Fnull (value); + + return Fnull (tem); +} + +DEFUN ("process-contact", Fprocess_contact, Sprocess_contact, + 1, 1, 0, + "Return the contact info of PROCESS; t for a real child.\n\ +For a net connection, the value is a cons cell of the form (HOST SERVICE).") + (process) + register Lisp_Object process; +{ + CHECK_PROCESS (process, 0); + return XPROCESS (process)->childp; +} + +#if 0 /* Turned off because we don't currently record this info + in the process. Perhaps add it. */ +DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 1, 1, 0, + "Return the connection type of PROCESS.\n\ +The value is nil for a pipe, t or `pty' for a pty, or `stream' for\n\ +a socket connection.") + (process) + Lisp_Object process; +{ + return XPROCESS (process)->type; +} +#endif + +Lisp_Object +list_processes_1 () +{ + register Lisp_Object tail, tem; + Lisp_Object proc, minspace, tem1; + register struct Lisp_Process *p; + char tembuf[80]; + + XSETFASTINT (minspace, 1); + + set_buffer_internal (XBUFFER (Vstandard_output)); + Fbuffer_disable_undo (Vstandard_output); + + current_buffer->truncate_lines = Qt; + + write_string ("\ +Proc Status Buffer Tty Command\n\ +---- ------ ------ --- -------\n", -1); + + for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) + { + Lisp_Object symbol; + + proc = Fcdr (Fcar (tail)); + p = XPROCESS (proc); + if (NILP (p->childp)) + continue; + + Finsert (1, &p->name); + Findent_to (make_number (13), minspace); + + if (!NILP (p->raw_status_low)) + update_status (p); + symbol = p->status; + if (CONSP (p->status)) + symbol = XCAR (p->status); + + + if (EQ (symbol, Qsignal)) + { + Lisp_Object tem; + tem = Fcar (Fcdr (p->status)); +#ifdef VMS + if (XINT (tem) < NSIG) + write_string (sys_errlist [XINT (tem)], -1); + else +#endif + Fprinc (symbol, Qnil); + } + else if (NETCONN_P (proc)) + { + if (EQ (symbol, Qrun)) + write_string ("open", -1); + else if (EQ (symbol, Qexit)) + write_string ("closed", -1); + else + Fprinc (symbol, Qnil); + } + else + Fprinc (symbol, Qnil); + + if (EQ (symbol, Qexit)) + { + Lisp_Object tem; + tem = Fcar (Fcdr (p->status)); + if (XFASTINT (tem)) + { + sprintf (tembuf, " %d", (int) XFASTINT (tem)); + write_string (tembuf, -1); + } + } + + if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)) + remove_process (proc); + + Findent_to (make_number (22), minspace); + if (NILP (p->buffer)) + insert_string ("(none)"); + else if (NILP (XBUFFER (p->buffer)->name)) + insert_string ("(Killed)"); + else + Finsert (1, &XBUFFER (p->buffer)->name); + + Findent_to (make_number (37), minspace); + + if (STRINGP (p->tty_name)) + Finsert (1, &p->tty_name); + else + insert_string ("(none)"); + + Findent_to (make_number (49), minspace); + + if (NETCONN_P (proc)) + { + sprintf (tembuf, "(network stream connection to %s)\n", + XSTRING (XCAR (p->childp))->data); + insert_string (tembuf); + } + else + { + tem = p->command; + while (1) + { + tem1 = Fcar (tem); + Finsert (1, &tem1); + tem = Fcdr (tem); + if (NILP (tem)) + break; + insert_string (" "); + } + insert_string ("\n"); + } + } + return Qnil; +} + +DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 0, "", + "Display a list of all processes.\n\ +Any process listed as exited or signaled is actually eliminated\n\ +after the listing is made.") + () +{ + internal_with_output_to_temp_buffer ("*Process List*", + list_processes_1, Qnil); + return Qnil; +} + +DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0, + "Return a list of all processes.") + () +{ + return Fmapcar (Qcdr, Vprocess_alist); +} + +/* Starting asynchronous inferior processes. */ + +static Lisp_Object start_process_unwind (); + +DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0, + "Start a program in a subprocess. Return the process object for it.\n\ +NAME is name for process. It is modified if necessary to make it unique.\n\ +BUFFER is the buffer or (buffer-name) to associate with the process.\n\ + Process output goes at end of that buffer, unless you specify\n\ + an output stream or filter function to handle the output.\n\ + BUFFER may be also nil, meaning that this process is not associated\n\ + with any buffer.\n\ +Third arg is program file name. It is searched for in PATH.\n\ +Remaining arguments are strings to give program as arguments.") + (nargs, args) + int nargs; + register Lisp_Object *args; +{ + Lisp_Object buffer, name, program, proc, current_dir, tem; +#ifdef VMS + register unsigned char *new_argv; + int len; +#else + register unsigned char **new_argv; +#endif + register int i; + int count = specpdl_ptr - specpdl; + + buffer = args[1]; + if (!NILP (buffer)) + buffer = Fget_buffer_create (buffer); + + /* Make sure that the child will be able to chdir to the current + buffer's current directory, or its unhandled equivalent. We + can't just have the child check for an error when it does the + chdir, since it's in a vfork. + + We have to GCPRO around this because Fexpand_file_name and + Funhandled_file_name_directory might call a file name handling + function. The argument list is protected by the caller, so all + we really have to worry about is buffer. */ + { + struct gcpro gcpro1, gcpro2; + + current_dir = current_buffer->directory; + + GCPRO2 (buffer, current_dir); + + current_dir + = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir), + Qnil); + if (NILP (Ffile_accessible_directory_p (current_dir))) + report_file_error ("Setting current directory", + Fcons (current_buffer->directory, Qnil)); + + UNGCPRO; + } + + name = args[0]; + CHECK_STRING (name, 0); + + program = args[2]; + + CHECK_STRING (program, 2); + +#ifdef VMS + /* Make a one member argv with all args concatenated + together separated by a blank. */ + len = STRING_BYTES (XSTRING (program)) + 2; + for (i = 3; i < nargs; i++) + { + tem = args[i]; + CHECK_STRING (tem, i); + len += STRING_BYTES (XSTRING (tem)) + 1; /* count the blank */ + } + new_argv = (unsigned char *) alloca (len); + strcpy (new_argv, XSTRING (program)->data); + for (i = 3; i < nargs; i++) + { + tem = args[i]; + CHECK_STRING (tem, i); + strcat (new_argv, " "); + strcat (new_argv, XSTRING (tem)->data); + } + /* Need to add code here to check for program existence on VMS */ + +#else /* not VMS */ + new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *)); + + /* If program file name is not absolute, search our path for it */ + if (!IS_DIRECTORY_SEP (XSTRING (program)->data[0]) + && !(XSTRING (program)->size > 1 + && IS_DEVICE_SEP (XSTRING (program)->data[1]))) + { + struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; + + tem = Qnil; + GCPRO4 (name, program, buffer, current_dir); + openp (Vexec_path, program, EXEC_SUFFIXES, &tem, 1); + UNGCPRO; + if (NILP (tem)) + report_file_error ("Searching for program", Fcons (program, Qnil)); + tem = Fexpand_file_name (tem, Qnil); + new_argv[0] = XSTRING (tem)->data; + } + else + { + if (!NILP (Ffile_directory_p (program))) + error ("Specified program for new process is a directory"); + + new_argv[0] = XSTRING (program)->data; + } + + for (i = 3; i < nargs; i++) + { + tem = args[i]; + CHECK_STRING (tem, i); + new_argv[i - 2] = XSTRING (tem)->data; + } + new_argv[i - 2] = 0; +#endif /* not VMS */ + + proc = make_process (name); + /* If an error occurs and we can't start the process, we want to + remove it from the process list. This means that each error + check in create_process doesn't need to call remove_process + itself; it's all taken care of here. */ + record_unwind_protect (start_process_unwind, proc); + + XPROCESS (proc)->childp = Qt; + XPROCESS (proc)->command_channel_p = Qnil; + XPROCESS (proc)->buffer = buffer; + XPROCESS (proc)->sentinel = Qnil; + XPROCESS (proc)->filter = Qnil; + XPROCESS (proc)->command = Flist (nargs - 2, args + 2); + + /* Make the process marker point into the process buffer (if any). */ + if (!NILP (buffer)) + set_marker_both (XPROCESS (proc)->mark, buffer, + BUF_ZV (XBUFFER (buffer)), + BUF_ZV_BYTE (XBUFFER (buffer))); + + { + /* Decide coding systems for communicating with the process. Here + we don't setup the structure coding_system nor pay attention to + unibyte mode. They are done in create_process. */ + + /* Qt denotes we have not yet called Ffind_operation_coding_system. */ + Lisp_Object coding_systems = Qt; + Lisp_Object val, *args2; + struct gcpro gcpro1; + + val = Vcoding_system_for_read; + if (NILP (val)) + { + args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof *args2); + args2[0] = Qstart_process; + for (i = 0; i < nargs; i++) args2[i + 1] = args[i]; + GCPRO1 (proc); + coding_systems = Ffind_operation_coding_system (nargs + 1, args2); + UNGCPRO; + if (CONSP (coding_systems)) + val = XCAR (coding_systems); + else if (CONSP (Vdefault_process_coding_system)) + val = XCAR (Vdefault_process_coding_system); + } + XPROCESS (proc)->decode_coding_system = val; + + val = Vcoding_system_for_write; + if (NILP (val)) + { + if (EQ (coding_systems, Qt)) + { + args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof args2); + args2[0] = Qstart_process; + for (i = 0; i < nargs; i++) args2[i + 1] = args[i]; + GCPRO1 (proc); + coding_systems = Ffind_operation_coding_system (nargs + 1, args2); + UNGCPRO; + } + if (CONSP (coding_systems)) + val = XCDR (coding_systems); + else if (CONSP (Vdefault_process_coding_system)) + val = XCDR (Vdefault_process_coding_system); + } + XPROCESS (proc)->encode_coding_system = val; + } + + XPROCESS (proc)->decoding_buf = make_uninit_string (0); + XPROCESS (proc)->decoding_carryover = make_number (0); + XPROCESS (proc)->encoding_buf = make_uninit_string (0); + XPROCESS (proc)->encoding_carryover = make_number (0); + + XPROCESS (proc)->inherit_coding_system_flag + = (NILP (buffer) || !inherit_process_coding_system + ? Qnil : Qt); + + create_process (proc, (char **) new_argv, current_dir); + + return unbind_to (count, proc); +} + +/* This function is the unwind_protect form for Fstart_process. If + PROC doesn't have its pid set, then we know someone has signaled + an error and the process wasn't started successfully, so we should + remove it from the process list. */ +static Lisp_Object +start_process_unwind (proc) + Lisp_Object proc; +{ + if (!PROCESSP (proc)) + abort (); + + /* Was PROC started successfully? */ + if (XINT (XPROCESS (proc)->pid) <= 0) + remove_process (proc); + + return Qnil; +} + +void +create_process_1 (timer) + struct atimer *timer; +{ + /* Nothing to do. */ +} + + +#if 0 /* This doesn't work; see the note before sigchld_handler. */ +#ifdef USG +#ifdef SIGCHLD +/* Mimic blocking of signals on system V, which doesn't really have it. */ + +/* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */ +int sigchld_deferred; + +SIGTYPE +create_process_sigchld () +{ + signal (SIGCHLD, create_process_sigchld); + + sigchld_deferred = 1; +} +#endif +#endif +#endif + +#ifndef VMS /* VMS version of this function is in vmsproc.c. */ +void +create_process (process, new_argv, current_dir) + Lisp_Object process; + char **new_argv; + Lisp_Object current_dir; +{ + int pid, inchannel, outchannel; + int sv[2]; +#ifdef POSIX_SIGNALS + sigset_t procmask; + sigset_t blocked; + struct sigaction sigint_action; + struct sigaction sigquit_action; +#ifdef AIX + struct sigaction sighup_action; +#endif +#else /* !POSIX_SIGNALS */ +#if 0 +#ifdef SIGCHLD + SIGTYPE (*sigchld)(); +#endif +#endif /* 0 */ +#endif /* !POSIX_SIGNALS */ + /* Use volatile to protect variables from being clobbered by longjmp. */ + volatile int forkin, forkout; + volatile int pty_flag = 0; + extern char **environ; + Lisp_Object buffer = XPROCESS (process)->buffer; + + inchannel = outchannel = -1; + +#ifdef HAVE_PTYS + if (!NILP (Vprocess_connection_type)) + outchannel = inchannel = allocate_pty (); + + if (inchannel >= 0) + { +#ifndef USG + /* On USG systems it does not work to open the pty's tty here + and then close and reopen it in the child. */ +#ifdef O_NOCTTY + /* Don't let this terminal become our controlling terminal + (in case we don't have one). */ + forkout = forkin = emacs_open (pty_name, O_RDWR | O_NOCTTY, 0); +#else + forkout = forkin = emacs_open (pty_name, O_RDWR, 0); +#endif + if (forkin < 0) + report_file_error ("Opening pty", Qnil); +#else + forkin = forkout = -1; +#endif /* not USG */ + pty_flag = 1; + } + else +#endif /* HAVE_PTYS */ +#ifdef SKTPAIR + { + if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0) + report_file_error ("Opening socketpair", Qnil); + outchannel = inchannel = sv[0]; + forkout = forkin = sv[1]; + } +#else /* not SKTPAIR */ + { + int tem; + tem = pipe (sv); + if (tem < 0) + report_file_error ("Creating pipe", Qnil); + inchannel = sv[0]; + forkout = sv[1]; + tem = pipe (sv); + if (tem < 0) + { + emacs_close (inchannel); + emacs_close (forkout); + report_file_error ("Creating pipe", Qnil); + } + outchannel = sv[1]; + forkin = sv[0]; + } +#endif /* not SKTPAIR */ + +#if 0 + /* Replaced by close_process_descs */ + set_exclusive_use (inchannel); + set_exclusive_use (outchannel); +#endif + +/* Stride people say it's a mystery why this is needed + as well as the O_NDELAY, but that it fails without this. */ +#if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS)) + { + int one = 1; + ioctl (inchannel, FIONBIO, &one); + } +#endif + +#ifdef O_NONBLOCK + fcntl (inchannel, F_SETFL, O_NONBLOCK); + fcntl (outchannel, F_SETFL, O_NONBLOCK); +#else +#ifdef O_NDELAY + fcntl (inchannel, F_SETFL, O_NDELAY); + fcntl (outchannel, F_SETFL, O_NDELAY); +#endif +#endif + + /* Record this as an active process, with its channels. + As a result, child_setup will close Emacs's side of the pipes. */ + chan_process[inchannel] = process; + XSETINT (XPROCESS (process)->infd, inchannel); + XSETINT (XPROCESS (process)->outfd, outchannel); + /* Record the tty descriptor used in the subprocess. */ + if (forkin < 0) + XPROCESS (process)->subtty = Qnil; + else + XSETFASTINT (XPROCESS (process)->subtty, forkin); + XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil); + XPROCESS (process)->status = Qrun; + if (!proc_decode_coding_system[inchannel]) + proc_decode_coding_system[inchannel] + = (struct coding_system *) xmalloc (sizeof (struct coding_system)); + setup_coding_system (XPROCESS (process)->decode_coding_system, + proc_decode_coding_system[inchannel]); + if (!proc_encode_coding_system[outchannel]) + proc_encode_coding_system[outchannel] + = (struct coding_system *) xmalloc (sizeof (struct coding_system)); + setup_coding_system (XPROCESS (process)->encode_coding_system, + proc_encode_coding_system[outchannel]); + + if ((!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters)) + || (NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters))) + { + /* In unibyte mode, character code conversion should not take + place but EOL conversion should. So, setup raw-text or one + of the subsidiary according to the information just setup. */ + if (!NILP (XPROCESS (process)->decode_coding_system)) + setup_raw_text_coding_system (proc_decode_coding_system[inchannel]); + if (!NILP (XPROCESS (process)->encode_coding_system)) + setup_raw_text_coding_system (proc_encode_coding_system[outchannel]); + } + + if (CODING_REQUIRE_ENCODING (proc_encode_coding_system[outchannel])) + { + /* Here we encode arguments by the coding system used for + sending data to the process. We don't support using + different coding systems for encoding arguments and for + encoding data sent to the process. */ + struct gcpro gcpro1; + int i = 1; + struct coding_system *coding = proc_encode_coding_system[outchannel]; + + coding->mode |= CODING_MODE_LAST_BLOCK; + GCPRO1 (process); + while (new_argv[i] != 0) + { + int len = strlen (new_argv[i]); + int size = encoding_buffer_size (coding, len); + unsigned char *buf = (unsigned char *) alloca (size); + + encode_coding (coding, (unsigned char *)new_argv[i], buf, len, size); + buf[coding->produced] = 0; + /* We don't have to free new_argv[i] because it points to a + Lisp string given as an argument to `start-process'. */ + new_argv[i++] = (char *) buf; + } + UNGCPRO; + coding->mode &= ~CODING_MODE_LAST_BLOCK; + } + + /* Delay interrupts until we have a chance to store + the new fork's pid in its process structure */ +#ifdef POSIX_SIGNALS + sigemptyset (&blocked); +#ifdef SIGCHLD + sigaddset (&blocked, SIGCHLD); +#endif +#ifdef HAVE_VFORK + /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal', + this sets the parent's signal handlers as well as the child's. + So delay all interrupts whose handlers the child might munge, + and record the current handlers so they can be restored later. */ + sigaddset (&blocked, SIGINT ); sigaction (SIGINT , 0, &sigint_action ); + sigaddset (&blocked, SIGQUIT); sigaction (SIGQUIT, 0, &sigquit_action); +#ifdef AIX + sigaddset (&blocked, SIGHUP ); sigaction (SIGHUP , 0, &sighup_action ); +#endif +#endif /* HAVE_VFORK */ + sigprocmask (SIG_BLOCK, &blocked, &procmask); +#else /* !POSIX_SIGNALS */ +#ifdef SIGCHLD +#ifdef BSD4_1 + sighold (SIGCHLD); +#else /* not BSD4_1 */ +#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX) + sigsetmask (sigmask (SIGCHLD)); +#else /* ordinary USG */ +#if 0 + sigchld_deferred = 0; + sigchld = signal (SIGCHLD, create_process_sigchld); +#endif +#endif /* ordinary USG */ +#endif /* not BSD4_1 */ +#endif /* SIGCHLD */ +#endif /* !POSIX_SIGNALS */ + + FD_SET (inchannel, &input_wait_mask); + FD_SET (inchannel, &non_keyboard_wait_mask); + if (inchannel > max_process_desc) + max_process_desc = inchannel; + + /* Until we store the proper pid, enable sigchld_handler + to recognize an unknown pid as standing for this process. + It is very important not to let this `marker' value stay + in the table after this function has returned; if it does + it might cause call-process to hang and subsequent asynchronous + processes to get their return values scrambled. */ + XSETINT (XPROCESS (process)->pid, -1); + + BLOCK_INPUT; + + { + /* child_setup must clobber environ on systems with true vfork. + Protect it from permanent change. */ + char **save_environ = environ; + + current_dir = ENCODE_FILE (current_dir); + +#ifndef WINDOWSNT + pid = vfork (); + if (pid == 0) +#endif /* not WINDOWSNT */ + { + int xforkin = forkin; + int xforkout = forkout; + +#if 0 /* This was probably a mistake--it duplicates code later on, + but fails to handle all the cases. */ + /* Make sure SIGCHLD is not blocked in the child. */ + sigsetmask (SIGEMPTYMASK); +#endif + + /* Make the pty be the controlling terminal of the process. */ +#ifdef HAVE_PTYS + /* First, disconnect its current controlling terminal. */ +#ifdef HAVE_SETSID + /* We tried doing setsid only if pty_flag, but it caused + process_set_signal to fail on SGI when using a pipe. */ + setsid (); + /* Make the pty's terminal the controlling terminal. */ + if (pty_flag) + { +#ifdef TIOCSCTTY + /* We ignore the return value + because [email protected] says that is necessary on Linux. */ + ioctl (xforkin, TIOCSCTTY, 0); +#endif + } +#else /* not HAVE_SETSID */ +#ifdef USG + /* It's very important to call setpgrp here and no time + afterwards. Otherwise, we lose our controlling tty which + is set when we open the pty. */ + setpgrp (); +#endif /* USG */ +#endif /* not HAVE_SETSID */ +#if defined (HAVE_TERMIOS) && defined (LDISC1) + if (pty_flag && xforkin >= 0) + { + struct termios t; + tcgetattr (xforkin, &t); + t.c_lflag = LDISC1; + if (tcsetattr (xforkin, TCSANOW, &t) < 0) + emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39); + } +#else +#if defined (NTTYDISC) && defined (TIOCSETD) + if (pty_flag && xforkin >= 0) + { + /* Use new line discipline. */ + int ldisc = NTTYDISC; + ioctl (xforkin, TIOCSETD, &ldisc); + } +#endif +#endif +#ifdef TIOCNOTTY + /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you + can do TIOCSPGRP only to the process's controlling tty. */ + if (pty_flag) + { + /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here? + I can't test it since I don't have 4.3. */ + int j = emacs_open ("/dev/tty", O_RDWR, 0); + ioctl (j, TIOCNOTTY, 0); + emacs_close (j); +#ifndef USG + /* In order to get a controlling terminal on some versions + of BSD, it is necessary to put the process in pgrp 0 + before it opens the terminal. */ +#ifdef HAVE_SETPGID + setpgid (0, 0); +#else + setpgrp (0, 0); +#endif +#endif + } +#endif /* TIOCNOTTY */ + +#if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY) +/*** There is a suggestion that this ought to be a + conditional on TIOCSPGRP, + or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)). + Trying the latter gave the wrong results on Debian GNU/Linux 1.1; + that system does seem to need this code, even though + both HAVE_SETSID and TIOCSCTTY are defined. */ + /* Now close the pty (if we had it open) and reopen it. + This makes the pty the controlling terminal of the subprocess. */ + if (pty_flag) + { +#ifdef SET_CHILD_PTY_PGRP + int pgrp = getpid (); +#endif + + /* I wonder if emacs_close (emacs_open (pty_name, ...)) + would work? */ + if (xforkin >= 0) + emacs_close (xforkin); + xforkout = xforkin = emacs_open (pty_name, O_RDWR, 0); + + if (xforkin < 0) + { + emacs_write (1, "Couldn't open the pty terminal ", 31); + emacs_write (1, pty_name, strlen (pty_name)); + emacs_write (1, "\n", 1); + _exit (1); + } + +#ifdef SET_CHILD_PTY_PGRP + ioctl (xforkin, TIOCSPGRP, &pgrp); + ioctl (xforkout, TIOCSPGRP, &pgrp); +#endif + } +#endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */ + +#ifdef SETUP_SLAVE_PTY + if (pty_flag) + { + SETUP_SLAVE_PTY; + } +#endif /* SETUP_SLAVE_PTY */ +#ifdef AIX + /* On AIX, we've disabled SIGHUP above once we start a child on a pty. + Now reenable it in the child, so it will die when we want it to. */ + if (pty_flag) + signal (SIGHUP, SIG_DFL); +#endif +#endif /* HAVE_PTYS */ + + signal (SIGINT, SIG_DFL); + signal (SIGQUIT, SIG_DFL); + + /* Stop blocking signals in the child. */ +#ifdef POSIX_SIGNALS + sigprocmask (SIG_SETMASK, &procmask, 0); +#else /* !POSIX_SIGNALS */ +#ifdef SIGCHLD +#ifdef BSD4_1 + sigrelse (SIGCHLD); +#else /* not BSD4_1 */ +#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX) + sigsetmask (SIGEMPTYMASK); +#else /* ordinary USG */ +#if 0 + signal (SIGCHLD, sigchld); +#endif +#endif /* ordinary USG */ +#endif /* not BSD4_1 */ +#endif /* SIGCHLD */ +#endif /* !POSIX_SIGNALS */ + + if (pty_flag) + child_setup_tty (xforkout); +#ifdef WINDOWSNT + pid = child_setup (xforkin, xforkout, xforkout, + new_argv, 1, current_dir); +#else /* not WINDOWSNT */ + child_setup (xforkin, xforkout, xforkout, + new_argv, 1, current_dir); +#endif /* not WINDOWSNT */ + } + environ = save_environ; + } + + UNBLOCK_INPUT; + + /* This runs in the Emacs process. */ + if (pid < 0) + { + if (forkin >= 0) + emacs_close (forkin); + if (forkin != forkout && forkout >= 0) + emacs_close (forkout); + } + else + { + /* vfork succeeded. */ + XSETFASTINT (XPROCESS (process)->pid, pid); + +#ifdef WINDOWSNT + register_child (pid, inchannel); +#endif /* WINDOWSNT */ + + /* If the subfork execv fails, and it exits, + this close hangs. I don't know why. + So have an interrupt jar it loose. */ + { + struct atimer *timer; + EMACS_TIME offset; + + stop_polling (); + EMACS_SET_SECS_USECS (offset, 1, 0); + timer = start_atimer (ATIMER_RELATIVE, offset, create_process_1, 0); + + XPROCESS (process)->subtty = Qnil; + if (forkin >= 0) + emacs_close (forkin); + + cancel_atimer (timer); + start_polling (); + } + + if (forkin != forkout && forkout >= 0) + emacs_close (forkout); + +#ifdef HAVE_PTYS + if (pty_flag) + XPROCESS (process)->tty_name = build_string (pty_name); + else +#endif + XPROCESS (process)->tty_name = Qnil; + } + + /* Restore the signal state whether vfork succeeded or not. + (We will signal an error, below, if it failed.) */ +#ifdef POSIX_SIGNALS +#ifdef HAVE_VFORK + /* Restore the parent's signal handlers. */ + sigaction (SIGINT, &sigint_action, 0); + sigaction (SIGQUIT, &sigquit_action, 0); +#ifdef AIX + sigaction (SIGHUP, &sighup_action, 0); +#endif +#endif /* HAVE_VFORK */ + /* Stop blocking signals in the parent. */ + sigprocmask (SIG_SETMASK, &procmask, 0); +#else /* !POSIX_SIGNALS */ +#ifdef SIGCHLD +#ifdef BSD4_1 + sigrelse (SIGCHLD); +#else /* not BSD4_1 */ +#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX) + sigsetmask (SIGEMPTYMASK); +#else /* ordinary USG */ +#if 0 + signal (SIGCHLD, sigchld); + /* Now really handle any of these signals + that came in during this function. */ + if (sigchld_deferred) + kill (getpid (), SIGCHLD); +#endif +#endif /* ordinary USG */ +#endif /* not BSD4_1 */ +#endif /* SIGCHLD */ +#endif /* !POSIX_SIGNALS */ + + /* Now generate the error if vfork failed. */ + if (pid < 0) + report_file_error ("Doing vfork", Qnil); +} +#endif /* not VMS */ + +#ifdef HAVE_SOCKETS + +/* open a TCP network connection to a given HOST/SERVICE. Treated + exactly like a normal process when reading and writing. Only + differences are in status display and process deletion. A network + connection has no PID; you cannot signal it. All you can do is + deactivate and close it via delete-process */ + +DEFUN ("open-network-stream", Fopen_network_stream, Sopen_network_stream, + 4, 4, 0, + "Open a TCP connection for a service to a host.\n\ +Returns a subprocess-object to represent the connection.\n\ +Input and output work as for subprocesses; `delete-process' closes it.\n\ +Args are NAME BUFFER HOST SERVICE.\n\ +NAME is name for process. It is modified if necessary to make it unique.\n\ +BUFFER is the buffer (or buffer-name) to associate with the process.\n\ + Process output goes at end of that buffer, unless you specify\n\ + an output stream or filter function to handle the output.\n\ + BUFFER may be also nil, meaning that this process is not associated\n\ + with any buffer\n\ +Third arg is name of the host to connect to, or its IP address.\n\ +Fourth arg SERVICE is name of the service desired, or an integer\n\ + specifying a port number to connect to.") + (name, buffer, host, service) + Lisp_Object name, buffer, host, service; +{ + Lisp_Object proc; +#ifndef HAVE_GETADDRINFO + struct sockaddr_in address; + struct servent *svc_info; + struct hostent *host_info_ptr, host_info; + char *(addr_list[2]); + IN_ADDR numeric_addr; + int port; +#else /* HAVE_GETADDRINFO */ + struct addrinfo hints, *res, *lres; + int ret = 0; + int xerrno = 0; + char *portstring, portbuf[128]; +#endif /* HAVE_GETADDRINFO */ + int s = -1, outch, inch; + struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; + int retry = 0; + int count = specpdl_ptr - specpdl; + int count1; + +#ifdef WINDOWSNT + /* Ensure socket support is loaded if available. */ + init_winsock (TRUE); +#endif + + GCPRO4 (name, buffer, host, service); + CHECK_STRING (name, 0); + CHECK_STRING (host, 0); + +#ifdef HAVE_GETADDRINFO + /* + * SERVICE can either be a string or int. + * Convert to a C string for later use by getaddrinfo. + */ + if (INTEGERP (service)) + { + sprintf (portbuf, "%d", XINT (service)); + portstring = portbuf; + } + else + { + CHECK_STRING (service, 0); + portstring = XSTRING (service)->data; + } +#else /* ! HAVE_GETADDRINFO */ + if (INTEGERP (service)) + port = htons ((unsigned short) XINT (service)); + else + { + CHECK_STRING (service, 0); + svc_info = getservbyname (XSTRING (service)->data, "tcp"); + if (svc_info == 0) + error ("Unknown service \"%s\"", XSTRING (service)->data); + port = svc_info->s_port; + } +#endif /* ! HAVE_GETADDRINFO */ + + + /* Slow down polling to every ten seconds. + Some kernels have a bug which causes retrying connect to fail + after a connect. Polling can interfere with gethostbyname too. */ +#ifdef POLL_FOR_INPUT + bind_polling_period (10); +#endif + +#ifndef TERM +#ifdef HAVE_GETADDRINFO + { + immediate_quit = 1; + QUIT; + memset (&hints, 0, sizeof (hints)); + hints.ai_flags = 0; + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = 0; + ret = getaddrinfo (XSTRING (host)->data, portstring, &hints, &res); + if (ret) + { + error ("%s/%s %s", XSTRING (host)->data, portstring, + strerror (ret)); + } + immediate_quit = 0; + } + + s = -1; + count1 = specpdl_ptr - specpdl; + record_unwind_protect (close_file_unwind, make_number (s)); + + for (lres = res; lres; lres = lres->ai_next) + { + s = socket (lres->ai_family, lres->ai_socktype, lres->ai_protocol); + if (s < 0) + continue; + + /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR) + when connect is interrupted. So let's not let it get interrupted. + Note we do not turn off polling, because polling is only used + when not interrupt_input, and thus not normally used on the systems + which have this bug. On systems which use polling, there's no way + to quit if polling is turned off. */ + if (interrupt_input) + unrequest_sigio (); + + immediate_quit = 1; + QUIT; + + ret = connect (s, lres->ai_addr, lres->ai_addrlen); + if (ret == 0) + break; + emacs_close (s); + s = -1; + } + + freeaddrinfo (res); + if (s < 0) + { + if (interrupt_input) + request_sigio (); + + errno = xerrno; + report_file_error ("connection failed", + Fcons (host, Fcons (name, Qnil))); + } +#else /* ! HAVE_GETADDRINFO */ + + while (1) + { +#if 0 +#ifdef TRY_AGAIN + h_errno = 0; +#endif +#endif + immediate_quit = 1; + QUIT; + host_info_ptr = gethostbyname (XSTRING (host)->data); + immediate_quit = 0; +#if 0 +#ifdef TRY_AGAIN + if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN)) +#endif +#endif + break; + Fsleep_for (make_number (1), Qnil); + } + if (host_info_ptr == 0) + /* Attempt to interpret host as numeric inet address */ + { + numeric_addr = inet_addr ((char *) XSTRING (host)->data); + if (NUMERIC_ADDR_ERROR) + error ("Unknown host \"%s\"", XSTRING (host)->data); + + host_info_ptr = &host_info; + host_info.h_name = 0; + host_info.h_aliases = 0; + host_info.h_addrtype = AF_INET; +#ifdef h_addr + /* Older machines have only one address slot called h_addr. + Newer machines have h_addr_list, but #define h_addr to + be its first element. */ + host_info.h_addr_list = &(addr_list[0]); +#endif + host_info.h_addr = (char*)(&numeric_addr); + addr_list[1] = 0; + /* numeric_addr isn't null-terminated; it has fixed length. */ + host_info.h_length = sizeof (numeric_addr); + } + + bzero (&address, sizeof address); + bcopy (host_info_ptr->h_addr, (char *) &address.sin_addr, + host_info_ptr->h_length); + address.sin_family = host_info_ptr->h_addrtype; + address.sin_port = port; + + s = socket (host_info_ptr->h_addrtype, SOCK_STREAM, 0); + if (s < 0) + report_file_error ("error creating socket", Fcons (name, Qnil)); + + count1 = specpdl_ptr - specpdl; + record_unwind_protect (close_file_unwind, make_number (s)); + + /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR) + when connect is interrupted. So let's not let it get interrupted. + Note we do not turn off polling, because polling is only used + when not interrupt_input, and thus not normally used on the systems + which have this bug. On systems which use polling, there's no way + to quit if polling is turned off. */ + if (interrupt_input) + unrequest_sigio (); + + loop: + + immediate_quit = 1; + QUIT; + + if (connect (s, (struct sockaddr *) &address, sizeof address) == -1 + && errno != EISCONN) + { + int xerrno = errno; + + immediate_quit = 0; + + if (errno == EINTR) + goto loop; + if (errno == EADDRINUSE && retry < 20) + { + /* A delay here is needed on some FreeBSD systems, + and it is harmless, since this retrying takes time anyway + and should be infrequent. */ + Fsleep_for (make_number (1), Qnil); + retry++; + goto loop; + } + + /* Discard the unwind protect. */ + specpdl_ptr = specpdl + count1; + + emacs_close (s); + + if (interrupt_input) + request_sigio (); + + errno = xerrno; + report_file_error ("connection failed", + Fcons (host, Fcons (name, Qnil))); + } +#endif /* ! HAVE_GETADDRINFO */ + + immediate_quit = 0; + + /* Discard the unwind protect. */ + specpdl_ptr = specpdl + count1; + +#ifdef POLL_FOR_INPUT + unbind_to (count, Qnil); +#endif + + if (interrupt_input) + request_sigio (); + +#else /* TERM */ + s = connect_server (0); + if (s < 0) + report_file_error ("error creating socket", Fcons (name, Qnil)); + send_command (s, C_PORT, 0, "%s:%d", XSTRING (host)->data, ntohs (port)); + send_command (s, C_DUMB, 1, 0); +#endif /* TERM */ + + inch = s; + outch = s; + + if (!NILP (buffer)) + buffer = Fget_buffer_create (buffer); + proc = make_process (name); + + chan_process[inch] = proc; + +#ifdef O_NONBLOCK + fcntl (inch, F_SETFL, O_NONBLOCK); +#else +#ifdef O_NDELAY + fcntl (inch, F_SETFL, O_NDELAY); +#endif +#endif + + XPROCESS (proc)->childp = Fcons (host, Fcons (service, Qnil)); + XPROCESS (proc)->command_channel_p = Qnil; + XPROCESS (proc)->buffer = buffer; + XPROCESS (proc)->sentinel = Qnil; + XPROCESS (proc)->filter = Qnil; + XPROCESS (proc)->command = Qnil; + XPROCESS (proc)->pid = Qnil; + XSETINT (XPROCESS (proc)->infd, inch); + XSETINT (XPROCESS (proc)->outfd, outch); + XPROCESS (proc)->status = Qrun; + FD_SET (inch, &input_wait_mask); + FD_SET (inch, &non_keyboard_wait_mask); + if (inch > max_process_desc) + max_process_desc = inch; + + { + /* Setup coding systems for communicating with the network stream. */ + struct gcpro gcpro1; + /* Qt denotes we have not yet called Ffind_operation_coding_system. */ + Lisp_Object coding_systems = Qt; + Lisp_Object args[5], val; + + if (!NILP (Vcoding_system_for_read)) + val = Vcoding_system_for_read; + else if ((!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters)) + || (NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters))) + /* We dare not decode end-of-line format by setting VAL to + Qraw_text, because the existing Emacs Lisp libraries + assume that they receive bare code including a sequene of + CR LF. */ + val = Qnil; + else + { + args[0] = Qopen_network_stream, args[1] = name, + args[2] = buffer, args[3] = host, args[4] = service; + GCPRO1 (proc); + coding_systems = Ffind_operation_coding_system (5, args); + UNGCPRO; + if (CONSP (coding_systems)) + val = XCAR (coding_systems); + else if (CONSP (Vdefault_process_coding_system)) + val = XCAR (Vdefault_process_coding_system); + else + val = Qnil; + } + XPROCESS (proc)->decode_coding_system = val; + + if (!NILP (Vcoding_system_for_write)) + val = Vcoding_system_for_write; + else if (NILP (current_buffer->enable_multibyte_characters)) + val = Qnil; + else + { + if (EQ (coding_systems, Qt)) + { + args[0] = Qopen_network_stream, args[1] = name, + args[2] = buffer, args[3] = host, args[4] = service; + GCPRO1 (proc); + coding_systems = Ffind_operation_coding_system (5, args); + UNGCPRO; + } + if (CONSP (coding_systems)) + val = XCDR (coding_systems); + else if (CONSP (Vdefault_process_coding_system)) + val = XCDR (Vdefault_process_coding_system); + else + val = Qnil; + } + XPROCESS (proc)->encode_coding_system = val; + } + + if (!proc_decode_coding_system[inch]) + proc_decode_coding_system[inch] + = (struct coding_system *) xmalloc (sizeof (struct coding_system)); + setup_coding_system (XPROCESS (proc)->decode_coding_system, + proc_decode_coding_system[inch]); + if (!proc_encode_coding_system[outch]) + proc_encode_coding_system[outch] + = (struct coding_system *) xmalloc (sizeof (struct coding_system)); + setup_coding_system (XPROCESS (proc)->encode_coding_system, + proc_encode_coding_system[outch]); + + XPROCESS (proc)->decoding_buf = make_uninit_string (0); + XPROCESS (proc)->decoding_carryover = make_number (0); + XPROCESS (proc)->encoding_buf = make_uninit_string (0); + XPROCESS (proc)->encoding_carryover = make_number (0); + + XPROCESS (proc)->inherit_coding_system_flag + = (NILP (buffer) || !inherit_process_coding_system + ? Qnil : Qt); + + UNGCPRO; + return proc; +} +#endif /* HAVE_SOCKETS */ + +void +deactivate_process (proc) + Lisp_Object proc; +{ + register int inchannel, outchannel; + register struct Lisp_Process *p = XPROCESS (proc); + + inchannel = XINT (p->infd); + outchannel = XINT (p->outfd); + + if (inchannel >= 0) + { + /* Beware SIGCHLD hereabouts. */ + flush_pending_output (inchannel); +#ifdef VMS + { + VMS_PROC_STUFF *get_vms_process_pointer (), *vs; + sys$dassgn (outchannel); + vs = get_vms_process_pointer (p->pid); + if (vs) + give_back_vms_process_stuff (vs); + } +#else + emacs_close (inchannel); + if (outchannel >= 0 && outchannel != inchannel) + emacs_close (outchannel); +#endif + + XSETINT (p->infd, -1); + XSETINT (p->outfd, -1); + chan_process[inchannel] = Qnil; + FD_CLR (inchannel, &input_wait_mask); + FD_CLR (inchannel, &non_keyboard_wait_mask); + if (inchannel == max_process_desc) + { + int i; + /* We just closed the highest-numbered process input descriptor, + so recompute the highest-numbered one now. */ + max_process_desc = 0; + for (i = 0; i < MAXDESC; i++) + if (!NILP (chan_process[i])) + max_process_desc = i; + } + } +} + +/* Close all descriptors currently in use for communication + with subprocess. This is used in a newly-forked subprocess + to get rid of irrelevant descriptors. */ + +void +close_process_descs () +{ +#ifndef WINDOWSNT + int i; + for (i = 0; i < MAXDESC; i++) + { + Lisp_Object process; + process = chan_process[i]; + if (!NILP (process)) + { + int in = XINT (XPROCESS (process)->infd); + int out = XINT (XPROCESS (process)->outfd); + if (in >= 0) + emacs_close (in); + if (out >= 0 && in != out) + emacs_close (out); + } + } +#endif +} + +DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output, + 0, 3, 0, + "Allow any pending output from subprocesses to be read by Emacs.\n\ +It is read into the process' buffers or given to their filter functions.\n\ +Non-nil arg PROCESS means do not return until some output has been received\n\ +from PROCESS.\n\ +Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\ +seconds and microseconds to wait; return after that much time whether\n\ +or not there is input.\n\ +Return non-nil iff we received any output before the timeout expired.") + (process, timeout, timeout_msecs) + register Lisp_Object process, timeout, timeout_msecs; +{ + int seconds; + int useconds; + + if (! NILP (process)) + CHECK_PROCESS (process, 0); + + if (! NILP (timeout_msecs)) + { + CHECK_NUMBER (timeout_msecs, 2); + useconds = XINT (timeout_msecs); + if (!INTEGERP (timeout)) + XSETINT (timeout, 0); + + { + int carry = useconds / 1000000; + + XSETINT (timeout, XINT (timeout) + carry); + useconds -= carry * 1000000; + + /* I think this clause is necessary because C doesn't + guarantee a particular rounding direction for negative + integers. */ + if (useconds < 0) + { + XSETINT (timeout, XINT (timeout) - 1); + useconds += 1000000; + } + } + } + else + useconds = 0; + + if (! NILP (timeout)) + { + CHECK_NUMBER (timeout, 1); + seconds = XINT (timeout); + if (seconds < 0 || (seconds == 0 && useconds == 0)) + seconds = -1; + } + else + { + if (NILP (process)) + seconds = -1; + else + seconds = 0; + } + + if (NILP (process)) + XSETFASTINT (process, 0); + + return + (wait_reading_process_input (seconds, useconds, process, 0) + ? Qt : Qnil); +} + +/* This variable is different from waiting_for_input in keyboard.c. + It is used to communicate to a lisp process-filter/sentinel (via the + function Fwaiting_for_user_input_p below) whether emacs was waiting + for user-input when that process-filter was called. + waiting_for_input cannot be used as that is by definition 0 when + lisp code is being evalled. + This is also used in record_asynch_buffer_change. + For that purpose, this must be 0 + when not inside wait_reading_process_input. */ +static int waiting_for_user_input_p; + +/* This is here so breakpoints can be put on it. */ +static void +wait_reading_process_input_1 () +{ +} + +/* Read and dispose of subprocess output while waiting for timeout to + elapse and/or keyboard input to be available. + + TIME_LIMIT is: + timeout in seconds, or + zero for no limit, or + -1 means gobble data immediately available but don't wait for any. + + MICROSECS is: + an additional duration to wait, measured in microseconds. + If this is nonzero and time_limit is 0, then the timeout + consists of MICROSECS only. + + READ_KBD is a lisp value: + 0 to ignore keyboard input, or + 1 to return when input is available, or + -1 meaning caller will actually read the input, so don't throw to + the quit handler, or + a cons cell, meaning wait until its car is non-nil + (and gobble terminal input into the buffer if any arrives), or + a process object, meaning wait until something arrives from that + process. The return value is true iff we read some input from + that process. + + DO_DISPLAY != 0 means redisplay should be done to show subprocess + output that arrives. + + If READ_KBD is a pointer to a struct Lisp_Process, then the + function returns true iff we received input from that process + before the timeout elapsed. + Otherwise, return true iff we received input from any process. */ + +int +wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) + int time_limit, microsecs; + Lisp_Object read_kbd; + int do_display; +{ + register int channel, nfds; + static SELECT_TYPE Available; + int xerrno; + Lisp_Object proc; + EMACS_TIME timeout, end_time; + SELECT_TYPE Atemp; + int wait_channel = -1; + struct Lisp_Process *wait_proc = 0; + int got_some_input = 0; + Lisp_Object *wait_for_cell = 0; + + FD_ZERO (&Available); + + /* If read_kbd is a process to watch, set wait_proc and wait_channel + accordingly. */ + if (PROCESSP (read_kbd)) + { + wait_proc = XPROCESS (read_kbd); + wait_channel = XINT (wait_proc->infd); + XSETFASTINT (read_kbd, 0); + } + + /* If waiting for non-nil in a cell, record where. */ + if (CONSP (read_kbd)) + { + wait_for_cell = &XCAR (read_kbd); + XSETFASTINT (read_kbd, 0); + } + + waiting_for_user_input_p = XINT (read_kbd); + + /* Since we may need to wait several times, + compute the absolute time to return at. */ + if (time_limit || microsecs) + { + EMACS_GET_TIME (end_time); + EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); + EMACS_ADD_TIME (end_time, end_time, timeout); + } +#ifdef hpux + /* AlainF 5-Jul-1996 + HP-UX 10.10 seem to have problems with signals coming in + Causes "poll: interrupted system call" messages when Emacs is run + in an X window + Turn off periodic alarms (in case they are in use) */ + turn_on_atimers (0); +#endif + + while (1) + { + int timeout_reduced_for_timers = 0; + +#ifdef HAVE_X_WINDOWS + if (display_busy_cursor_p) + Fx_hide_busy_cursor (Qnil); +#endif + + /* If calling from keyboard input, do not quit + since we want to return C-g as an input character. + Otherwise, do pending quit if requested. */ + if (XINT (read_kbd) >= 0) + QUIT; + + /* Exit now if the cell we're waiting for became non-nil. */ + if (wait_for_cell && ! NILP (*wait_for_cell)) + break; + + /* Compute time from now till when time limit is up */ + /* Exit if already run out */ + if (time_limit == -1) + { + /* -1 specified for timeout means + gobble output available now + but don't wait at all. */ + + EMACS_SET_SECS_USECS (timeout, 0, 0); + } + else if (time_limit || microsecs) + { + EMACS_GET_TIME (timeout); + EMACS_SUB_TIME (timeout, end_time, timeout); + if (EMACS_TIME_NEG_P (timeout)) + break; + } + else + { + EMACS_SET_SECS_USECS (timeout, 100000, 0); + } + + /* Normally we run timers here. + But not if wait_for_cell; in those cases, + the wait is supposed to be short, + and those callers cannot handle running arbitrary Lisp code here. */ + if (! wait_for_cell) + { + EMACS_TIME timer_delay; + int old_timers_run; + + retry: + old_timers_run = timers_run; + timer_delay = timer_check (1); + if (timers_run != old_timers_run && do_display) + { + redisplay_preserve_echo_area (); + /* We must retry, since a timer may have requeued itself + and that could alter the time_delay. */ + goto retry; + } + + /* If there is unread keyboard input, also return. */ + if (XINT (read_kbd) != 0 + && requeued_events_pending_p ()) + break; + + if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1) + { + EMACS_TIME difference; + EMACS_SUB_TIME (difference, timer_delay, timeout); + if (EMACS_TIME_NEG_P (difference)) + { + timeout = timer_delay; + timeout_reduced_for_timers = 1; + } + } + /* If time_limit is -1, we are not going to wait at all. */ + else if (time_limit != -1) + { + /* This is so a breakpoint can be put here. */ + wait_reading_process_input_1 (); + } + } + + /* Cause C-g and alarm signals to take immediate action, + and cause input available signals to zero out timeout. + + It is important that we do this before checking for process + activity. If we get a SIGCHLD after the explicit checks for + process activity, timeout is the only way we will know. */ + if (XINT (read_kbd) < 0) + set_waiting_for_input (&timeout); + + /* If status of something has changed, and no input is + available, notify the user of the change right away. After + this explicit check, we'll let the SIGCHLD handler zap + timeout to get our attention. */ + if (update_tick != process_tick && do_display) + { + Atemp = input_wait_mask; + EMACS_SET_SECS_USECS (timeout, 0, 0); + if ((select (max (max_process_desc, max_keyboard_desc) + 1, + &Atemp, (SELECT_TYPE *)0, (SELECT_TYPE *)0, + &timeout) + <= 0)) + { + /* It's okay for us to do this and then continue with + the loop, since timeout has already been zeroed out. */ + clear_waiting_for_input (); + status_notify (); + } + } + + /* Don't wait for output from a non-running process. */ + if (wait_proc != 0 && !NILP (wait_proc->raw_status_low)) + update_status (wait_proc); + if (wait_proc != 0 + && ! EQ (wait_proc->status, Qrun)) + { + int nread, total_nread = 0; + + clear_waiting_for_input (); + XSETPROCESS (proc, wait_proc); + + /* Read data from the process, until we exhaust it. */ + while (XINT (wait_proc->infd) >= 0) + { + nread = read_process_output (proc, XINT (wait_proc->infd)); + + if (nread == 0) + break; + + if (0 < nread) + total_nread += nread; +#ifdef EIO + else if (nread == -1 && EIO == errno) + break; +#endif +#ifdef EAGAIN + else if (nread == -1 && EAGAIN == errno) + break; +#endif +#ifdef EWOULDBLOCK + else if (nread == -1 && EWOULDBLOCK == errno) + break; +#endif + } + if (total_nread > 0 && do_display) + redisplay_preserve_echo_area (); + + break; + } + + /* Wait till there is something to do */ + + if (wait_for_cell) + Available = non_process_wait_mask; + else if (! XINT (read_kbd)) + Available = non_keyboard_wait_mask; + else + Available = input_wait_mask; + + /* If frame size has changed or the window is newly mapped, + redisplay now, before we start to wait. There is a race + condition here; if a SIGIO arrives between now and the select + and indicates that a frame is trashed, the select may block + displaying a trashed screen. */ + if (frame_garbaged && do_display) + { + clear_waiting_for_input (); + redisplay_preserve_echo_area (); + if (XINT (read_kbd) < 0) + set_waiting_for_input (&timeout); + } + + if (XINT (read_kbd) && detect_input_pending ()) + { + nfds = 0; + FD_ZERO (&Available); + } + else + nfds = select (max (max_process_desc, max_keyboard_desc) + 1, + &Available, (SELECT_TYPE *)0, (SELECT_TYPE *)0, + &timeout); + + xerrno = errno; + + /* Make C-g and alarm signals set flags again */ + clear_waiting_for_input (); + + /* If we woke up due to SIGWINCH, actually change size now. */ + do_pending_window_change (0); + + if (time_limit && nfds == 0 && ! timeout_reduced_for_timers) + /* We wanted the full specified time, so return now. */ + break; + if (nfds < 0) + { + if (xerrno == EINTR) + FD_ZERO (&Available); +#ifdef ultrix + /* Ultrix select seems to return ENOMEM when it is + interrupted. Treat it just like EINTR. Bleah. Note + that we want to test for the "ultrix" CPP symbol, not + "__ultrix__"; the latter is only defined under GCC, but + not by DEC's bundled CC. -JimB */ + else if (xerrno == ENOMEM) + FD_ZERO (&Available); +#endif +#ifdef ALLIANT + /* This happens for no known reason on ALLIANT. + I am guessing that this is the right response. -- RMS. */ + else if (xerrno == EFAULT) + FD_ZERO (&Available); +#endif + else if (xerrno == EBADF) + { +#ifdef AIX + /* AIX doesn't handle PTY closure the same way BSD does. On AIX, + the child's closure of the pts gives the parent a SIGHUP, and + the ptc file descriptor is automatically closed, + yielding EBADF here or at select() call above. + So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF + in m/ibmrt-aix.h), and here we just ignore the select error. + Cleanup occurs c/o status_notify after SIGCLD. */ + FD_ZERO (&Available); /* Cannot depend on values returned */ +#else + abort (); +#endif + } + else + error ("select error: %s", emacs_strerror (xerrno)); + } +#if defined(sun) && !defined(USG5_4) + else if (nfds > 0 && keyboard_bit_set (&Available) + && interrupt_input) + /* System sometimes fails to deliver SIGIO. + + David J. Mackenzie says that Emacs doesn't compile under + Solaris if this code is enabled, thus the USG5_4 in the CPP + conditional. "I haven't noticed any ill effects so far. + If you find a Solaris expert somewhere, they might know + better." */ + kill (getpid (), SIGIO); +#endif + +#if 0 /* When polling is used, interrupt_input is 0, + so get_input_pending should read the input. + So this should not be needed. */ + /* If we are using polling for input, + and we see input available, make it get read now. + Otherwise it might not actually get read for a second. + And on hpux, since we turn off polling in wait_reading_process_input, + it might never get read at all if we don't spend much time + outside of wait_reading_process_input. */ + if (XINT (read_kbd) && interrupt_input + && keyboard_bit_set (&Available) + && input_polling_used ()) + kill (getpid (), SIGALRM); +#endif + + /* Check for keyboard input */ + /* If there is any, return immediately + to give it higher priority than subprocesses */ + + if (XINT (read_kbd) != 0 + && detect_input_pending_run_timers (do_display)) + { + swallow_events (do_display); + if (detect_input_pending_run_timers (do_display)) + break; + } + + /* If there is unread keyboard input, also return. */ + if (XINT (read_kbd) != 0 + && requeued_events_pending_p ()) + break; + + /* If we are not checking for keyboard input now, + do process events (but don't run any timers). + This is so that X events will be processed. + Otherwise they may have to wait until polling takes place. + That would causes delays in pasting selections, for example. + + (We used to do this only if wait_for_cell.) */ + if (XINT (read_kbd) == 0 && detect_input_pending ()) + { + swallow_events (do_display); +#if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */ + if (detect_input_pending ()) + break; +#endif + } + + /* Exit now if the cell we're waiting for became non-nil. */ + if (wait_for_cell && ! NILP (*wait_for_cell)) + break; + +#ifdef SIGIO + /* If we think we have keyboard input waiting, but didn't get SIGIO, + go read it. This can happen with X on BSD after logging out. + In that case, there really is no input and no SIGIO, + but select says there is input. */ + + if (XINT (read_kbd) && interrupt_input + && keyboard_bit_set (&Available)) + kill (getpid (), SIGIO); +#endif + + if (! wait_proc) + got_some_input |= nfds > 0; + + /* If checking input just got us a size-change event from X, + obey it now if we should. */ + if (XINT (read_kbd) || wait_for_cell) + do_pending_window_change (0); + + /* Check for data from a process. */ + /* Really FIRST_PROC_DESC should be 0 on Unix, + but this is safer in the short run. */ + for (channel = 0; channel <= max_process_desc; channel++) + { + if (FD_ISSET (channel, &Available) + && FD_ISSET (channel, &non_keyboard_wait_mask)) + { + int nread; + + /* If waiting for this channel, arrange to return as + soon as no more input to be processed. No more + waiting. */ + if (wait_channel == channel) + { + wait_channel = -1; + time_limit = -1; + got_some_input = 1; + } + proc = chan_process[channel]; + if (NILP (proc)) + continue; + + /* Read data from the process, starting with our + buffered-ahead character if we have one. */ + + nread = read_process_output (proc, channel); + if (nread > 0) + { + /* Since read_process_output can run a filter, + which can call accept-process-output, + don't try to read from any other processes + before doing the select again. */ + FD_ZERO (&Available); + + if (do_display) + redisplay_preserve_echo_area (); + } +#ifdef EWOULDBLOCK + else if (nread == -1 && errno == EWOULDBLOCK) + ; +#endif + /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK, + and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */ +#ifdef O_NONBLOCK + else if (nread == -1 && errno == EAGAIN) + ; +#else +#ifdef O_NDELAY + else if (nread == -1 && errno == EAGAIN) + ; + /* Note that we cannot distinguish between no input + available now and a closed pipe. + With luck, a closed pipe will be accompanied by + subprocess termination and SIGCHLD. */ + else if (nread == 0 && !NETCONN_P (proc)) + ; +#endif /* O_NDELAY */ +#endif /* O_NONBLOCK */ +#ifdef HAVE_PTYS + /* On some OSs with ptys, when the process on one end of + a pty exits, the other end gets an error reading with + errno = EIO instead of getting an EOF (0 bytes read). + Therefore, if we get an error reading and errno = + EIO, just continue, because the child process has + exited and should clean itself up soon (e.g. when we + get a SIGCHLD). + + However, it has been known to happen that the SIGCHLD + got lost. So raise the signl again just in case. + It can't hurt. */ + else if (nread == -1 && errno == EIO) + kill (getpid (), SIGCHLD); +#endif /* HAVE_PTYS */ + /* If we can detect process termination, don't consider the process + gone just because its pipe is closed. */ +#ifdef SIGCHLD + else if (nread == 0 && !NETCONN_P (proc)) + ; +#endif + else + { + /* Preserve status of processes already terminated. */ + XSETINT (XPROCESS (proc)->tick, ++process_tick); + deactivate_process (proc); + if (!NILP (XPROCESS (proc)->raw_status_low)) + update_status (XPROCESS (proc)); + if (EQ (XPROCESS (proc)->status, Qrun)) + XPROCESS (proc)->status + = Fcons (Qexit, Fcons (make_number (256), Qnil)); + } + } + } /* end for each file descriptor */ + } /* end while exit conditions not met */ + + waiting_for_user_input_p = 0; + + /* If calling from keyboard input, do not quit + since we want to return C-g as an input character. + Otherwise, do pending quit if requested. */ + if (XINT (read_kbd) >= 0) + { + /* Prevent input_pending from remaining set if we quit. */ + clear_input_pending (); + QUIT; + } +#ifdef hpux + /* AlainF 5-Jul-1996 + HP-UX 10.10 seems to have problems with signals coming in + Causes "poll: interrupted system call" messages when Emacs is run + in an X window + Turn periodic alarms back on */ + start_polling (); +#endif + +#ifdef HAVE_X_WINDOWS + if (display_busy_cursor_p) + if (!inhibit_busy_cursor) + Fx_show_busy_cursor (); +#endif + + return got_some_input; +} + +/* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */ + +static Lisp_Object +read_process_output_call (fun_and_args) + Lisp_Object fun_and_args; +{ + return apply1 (XCAR (fun_and_args), XCDR (fun_and_args)); +} + +static Lisp_Object +read_process_output_error_handler (error) + Lisp_Object error; +{ + cmd_error_internal (error, "error in process filter: "); + Vinhibit_quit = Qt; + update_echo_area (); + Fsleep_for (make_number (2), Qnil); +} + +/* Read pending output from the process channel, + starting with our buffered-ahead character if we have one. + Yield number of decoded characters read. + + This function reads at most 1024 characters. + If you want to read all available subprocess output, + you must call it repeatedly until it returns zero. + + The characters read are decoded according to PROC's coding-system + for decoding. */ + +int +read_process_output (proc, channel) + Lisp_Object proc; + register int channel; +{ + register int nchars, nbytes; + char *chars; +#ifdef VMS + int chars_allocated = 0; /* If 1, `chars' should be freed later. */ +#else + char buf[1024]; +#endif + register Lisp_Object outstream; + register struct buffer *old = current_buffer; + register struct Lisp_Process *p = XPROCESS (proc); + register int opoint; + struct coding_system *coding = proc_decode_coding_system[channel]; + int chars_in_decoding_buf = 0; /* If 1, `chars' points + XSTRING (p->decoding_buf)->data. */ + int carryover = XINT (p->decoding_carryover); + +#ifdef VMS + VMS_PROC_STUFF *vs, *get_vms_process_pointer(); + + vs = get_vms_process_pointer (p->pid); + if (vs) + { + if (!vs->iosb[0]) + return (0); /* Really weird if it does this */ + if (!(vs->iosb[0] & 1)) + return -1; /* I/O error */ + } + else + error ("Could not get VMS process pointer"); + chars = vs->inputBuffer; + nbytes = clean_vms_buffer (chars, vs->iosb[1]); + if (nbytes <= 0) + { + start_vms_process_read (vs); /* Crank up the next read on the process */ + return 1; /* Nothing worth printing, say we got 1 */ + } + if (carryover > 0) + { + /* The data carried over in the previous decoding (which are at + the tail of decoding buffer) should be prepended to the new + data read to decode all together. */ + char *buf = (char *) xmalloc (nbytes + carryover); + + bcopy (XSTRING (p->decoding_buf)->data + + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover, + buf, carryover); + bcopy (chars, buf + carryover, nbytes); + chars = buf; + chars_allocated = 1; + } +#else /* not VMS */ + + if (carryover) + /* See the comment above. */ + bcopy (XSTRING (p->decoding_buf)->data + + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover, + buf, carryover); + + if (proc_buffered_char[channel] < 0) + nbytes = emacs_read (channel, buf + carryover, (sizeof buf) - carryover); + else + { + buf[carryover] = proc_buffered_char[channel]; + proc_buffered_char[channel] = -1; + nbytes = emacs_read (channel, buf + carryover + 1, + (sizeof buf) - carryover - 1); + if (nbytes < 0) + nbytes = 1; + else + nbytes = nbytes + 1; + } + chars = buf; +#endif /* not VMS */ + + XSETINT (p->decoding_carryover, 0); + + /* At this point, NBYTES holds number of characters just received + (including the one in proc_buffered_char[channel]). */ + if (nbytes <= 0) + { + if (nbytes < 0 || coding->mode & CODING_MODE_LAST_BLOCK) + return nbytes; + coding->mode |= CODING_MODE_LAST_BLOCK; + } + + /* Now set NBYTES how many bytes we must decode. */ + nbytes += carryover; + nchars = nbytes; + + if (CODING_MAY_REQUIRE_DECODING (coding)) + { + int require = decoding_buffer_size (coding, nbytes); + int result; + + if (STRING_BYTES (XSTRING (p->decoding_buf)) < require) + p->decoding_buf = make_uninit_string (require); + result = decode_coding (coding, chars, XSTRING (p->decoding_buf)->data, + nbytes, STRING_BYTES (XSTRING (p->decoding_buf))); + carryover = nbytes - coding->consumed; + if (carryover > 0) + { + /* Copy the carryover bytes to the end of p->decoding_buf, to + be processed on the next read. Since decoding_buffer_size + asks for an extra amount of space beyond the maximum + expected for the output, there should always be sufficient + space for the carryover (which is by definition a sequence + of bytes that was not long enough to be decoded, and thus + has a bounded length). */ + if (STRING_BYTES (XSTRING (p->decoding_buf)) + < coding->produced + carryover) + abort (); + bcopy (chars + coding->consumed, + XSTRING (p->decoding_buf)->data + + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover, + carryover); + XSETINT (p->decoding_carryover, carryover); + } + + /* A new coding system might be found by `decode_coding'. */ + if (!EQ (p->decode_coding_system, coding->symbol)) + { + p->decode_coding_system = coding->symbol; + + /* Don't call setup_coding_system for + proc_decode_coding_system[channel] here. It is done in + detect_coding called via decode_coding above. */ + + /* If a coding system for encoding is not yet decided, we set + it as the same as coding-system for decoding. + + But, before doing that we must check if + proc_encode_coding_system[p->outfd] surely points to a + valid memory because p->outfd will be changed once EOF is + sent to the process. */ + if (NILP (p->encode_coding_system) + && proc_encode_coding_system[XINT (p->outfd)]) + { + p->encode_coding_system = coding->symbol; + setup_coding_system (coding->symbol, + proc_encode_coding_system[XINT (p->outfd)]); + } + } + +#ifdef VMS + /* Now we don't need the contents of `chars'. */ + if (chars_allocated) + free (chars); +#endif + if (coding->produced == 0) + return 0; + chars = (char *) XSTRING (p->decoding_buf)->data; + nbytes = coding->produced; + nchars = (coding->fake_multibyte + ? multibyte_chars_in_text (chars, nbytes) + : coding->produced_char); + chars_in_decoding_buf = 1; + } + else + { +#ifdef VMS + if (chars_allocated) + { + /* Although we don't have to decode the received data, we + must move it to an area which we don't have to free. */ + if (! STRINGP (p->decoding_buf) + || STRING_BYTES (XSTRING (p->decoding_buf)) < nbytes) + p->decoding_buf = make_uninit_string (nbytes); + bcopy (chars, XSTRING (p->decoding_buf)->data, nbytes); + free (chars); + chars = XSTRING (p->decoding_buf)->data; + chars_in_decoding_buf = 1; + } +#endif + nchars = multibyte_chars_in_text (chars, nbytes); + } + + Vlast_coding_system_used = coding->symbol; + + /* If the caller required, let the process associated buffer + inherit the coding-system used to decode the process output. */ + if (! NILP (p->inherit_coding_system_flag) + && !NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name)) + { + struct buffer *prev_buf = current_buffer; + + Fset_buffer (p->buffer); + call1 (intern ("after-insert-file-set-buffer-file-coding-system"), + make_number (nbytes)); + set_buffer_internal (prev_buf); + } + + /* Read and dispose of the process output. */ + outstream = p->filter; + if (!NILP (outstream)) + { + /* We inhibit quit here instead of just catching it so that + hitting ^G when a filter happens to be running won't screw + it up. */ + int count = specpdl_ptr - specpdl; + Lisp_Object odeactivate; + Lisp_Object obuffer, okeymap; + Lisp_Object text; + int outer_running_asynch_code = running_asynch_code; + int waiting = waiting_for_user_input_p; + + /* No need to gcpro these, because all we do with them later + is test them for EQness, and none of them should be a string. */ + odeactivate = Vdeactivate_mark; + XSETBUFFER (obuffer, current_buffer); + okeymap = current_buffer->keymap; + + specbind (Qinhibit_quit, Qt); + specbind (Qlast_nonmenu_event, Qt); + + /* In case we get recursively called, + and we already saved the match data nonrecursively, + save the same match data in safely recursive fashion. */ + if (outer_running_asynch_code) + { + Lisp_Object tem; + /* Don't clobber the CURRENT match data, either! */ + tem = Fmatch_data (Qnil, Qnil); + restore_match_data (); + record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); + Fset_match_data (tem); + } + + /* For speed, if a search happens within this code, + save the match data in a special nonrecursive fashion. */ + running_asynch_code = 1; + + /* The multibyteness of a string given to the filter is decided + by which coding system we used for decoding. */ + if (coding->type == coding_type_no_conversion + || coding->type == coding_type_raw_text) + text = make_unibyte_string (chars, nbytes); + else + text = make_multibyte_string (chars, nchars, nbytes); + + internal_condition_case_1 (read_process_output_call, + Fcons (outstream, + Fcons (proc, Fcons (text, Qnil))), + !NILP (Vdebug_on_error) ? Qnil : Qerror, + read_process_output_error_handler); + + /* If we saved the match data nonrecursively, restore it now. */ + restore_match_data (); + running_asynch_code = outer_running_asynch_code; + + /* Handling the process output should not deactivate the mark. */ + Vdeactivate_mark = odeactivate; + + /* Restore waiting_for_user_input_p as it was + when we were called, in case the filter clobbered it. */ + waiting_for_user_input_p = waiting; + +#if 0 /* Call record_asynch_buffer_change unconditionally, + because we might have changed minor modes or other things + that affect key bindings. */ + if (! EQ (Fcurrent_buffer (), obuffer) + || ! EQ (current_buffer->keymap, okeymap)) +#endif + /* But do it only if the caller is actually going to read events. + Otherwise there's no need to make him wake up, and it could + cause trouble (for example it would make Fsit_for return). */ + if (waiting_for_user_input_p == -1) + record_asynch_buffer_change (); + +#ifdef VMS + start_vms_process_read (vs); +#endif + unbind_to (count, Qnil); + return nchars; + } + + /* If no filter, write into buffer if it isn't dead. */ + if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name)) + { + Lisp_Object old_read_only; + int old_begv, old_zv; + int old_begv_byte, old_zv_byte; + Lisp_Object odeactivate; + int before, before_byte; + int opoint_byte; + + odeactivate = Vdeactivate_mark; + + Fset_buffer (p->buffer); + opoint = PT; + opoint_byte = PT_BYTE; + old_read_only = current_buffer->read_only; + old_begv = BEGV; + old_zv = ZV; + old_begv_byte = BEGV_BYTE; + old_zv_byte = ZV_BYTE; + + current_buffer->read_only = Qnil; + + /* Insert new output into buffer + at the current end-of-output marker, + thus preserving logical ordering of input and output. */ + if (XMARKER (p->mark)->buffer) + SET_PT_BOTH (clip_to_bounds (BEGV, marker_position (p->mark), ZV), + clip_to_bounds (BEGV_BYTE, marker_byte_position (p->mark), + ZV_BYTE)); + else + SET_PT_BOTH (ZV, ZV_BYTE); + before = PT; + before_byte = PT_BYTE; + + /* If the output marker is outside of the visible region, save + the restriction and widen. */ + if (! (BEGV <= PT && PT <= ZV)) + Fwiden (); + + if (NILP (current_buffer->enable_multibyte_characters)) + nchars = nbytes; + + /* Insert before markers in case we are inserting where + the buffer's mark is, and the user's next command is Meta-y. */ + if (chars_in_decoding_buf) + { + /* Since multibyteness of p->docoding_buf is corrupted, we + can't use insert_from_string_before_markers. */ + char *temp_buf; + + temp_buf = (char *) alloca (nbytes); + bcopy (XSTRING (p->decoding_buf)->data, temp_buf, nbytes); + insert_before_markers (temp_buf, nbytes); + } + else + { + insert_1_both (chars, nchars, nbytes, 0, 1, 1); + signal_after_change (before, 0, PT - before); + update_compositions (before, PT, CHECK_BORDER); + } + set_marker_both (p->mark, p->buffer, PT, PT_BYTE); + + update_mode_lines++; + + /* Make sure opoint and the old restrictions + float ahead of any new text just as point would. */ + if (opoint >= before) + { + opoint += PT - before; + opoint_byte += PT_BYTE - before_byte; + } + if (old_begv > before) + { + old_begv += PT - before; + old_begv_byte += PT_BYTE - before_byte; + } + if (old_zv >= before) + { + old_zv += PT - before; + old_zv_byte += PT_BYTE - before_byte; + } + + /* If the restriction isn't what it should be, set it. */ + if (old_begv != BEGV || old_zv != ZV) + Fnarrow_to_region (make_number (old_begv), make_number (old_zv)); + + /* Handling the process output should not deactivate the mark. */ + Vdeactivate_mark = odeactivate; + + current_buffer->read_only = old_read_only; + SET_PT_BOTH (opoint, opoint_byte); + set_buffer_internal (old); + } +#ifdef VMS + start_vms_process_read (vs); +#endif + return nbytes; +} + +DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p, + 0, 0, 0, + "Returns non-nil if emacs is waiting for input from the user.\n\ +This is intended for use by asynchronous process output filters and sentinels.") + () +{ + return (waiting_for_user_input_p ? Qt : Qnil); +} + +/* Sending data to subprocess */ + +jmp_buf send_process_frame; + +SIGTYPE +send_process_trap () +{ +#ifdef BSD4_1 + sigrelse (SIGPIPE); + sigrelse (SIGALRM); +#endif /* BSD4_1 */ + longjmp (send_process_frame, 1); +} + +/* Send some data to process PROC. + BUF is the beginning of the data; LEN is the number of characters. + OBJECT is the Lisp object that the data comes from. + + The data is encoded by PROC's coding-system for encoding before it + is sent. But if the data ends at the middle of multi-byte + representation, that incomplete sequence of bytes are sent without + being encoded. Should we store them in a buffer to prepend them to + the data send later? */ + +void +send_process (proc, buf, len, object) + volatile Lisp_Object proc; + unsigned char *buf; + int len; + Lisp_Object object; +{ + /* Use volatile to protect variables from being clobbered by longjmp. */ + int rv; + volatile unsigned char *procname = XSTRING (XPROCESS (proc)->name)->data; + struct coding_system *coding; + struct gcpro gcpro1; + int carryover = XINT (XPROCESS (proc)->encoding_carryover); + + GCPRO1 (object); + +#ifdef VMS + struct Lisp_Process *p = XPROCESS (proc); + VMS_PROC_STUFF *vs, *get_vms_process_pointer(); +#endif /* VMS */ + + if (! NILP (XPROCESS (proc)->raw_status_low)) + update_status (XPROCESS (proc)); + if (! EQ (XPROCESS (proc)->status, Qrun)) + error ("Process %s not running", procname); + if (XINT (XPROCESS (proc)->outfd) < 0) + error ("Output file descriptor of %s is closed", procname); + + coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)]; + Vlast_coding_system_used = coding->symbol; + + if (CODING_REQUIRE_ENCODING (coding)) + { + int require = encoding_buffer_size (coding, len); + int offset; + unsigned char *temp_buf = NULL; + + /* Remember the offset of data because a string or a buffer may + be relocated. Setting OFFSET to -1 means we don't have to + care about relocation. */ + offset = (BUFFERP (object) + ? BUF_PTR_BYTE_POS (XBUFFER (object), buf) + : (STRINGP (object) + ? buf - XSTRING (object)->data + : -1)); + + if (carryover > 0) + { + temp_buf = (unsigned char *) xmalloc (len + carryover); + + if (offset >= 0) + { + if (BUFFERP (object)) + buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset); + else if (STRINGP (object)) + buf = offset + XSTRING (object)->data; + /* Now we don't have to care about relocation. */ + offset = -1; + } + bcopy ((XSTRING (XPROCESS (proc)->encoding_buf)->data + + STRING_BYTES (XSTRING (XPROCESS (proc)->encoding_buf)) + - carryover), + temp_buf, + carryover); + bcopy (buf, temp_buf + carryover, len); + buf = temp_buf; + } + + if (STRING_BYTES (XSTRING (XPROCESS (proc)->encoding_buf)) < require) + { + XPROCESS (proc)->encoding_buf = make_uninit_string (require); + + if (offset >= 0) + { + if (BUFFERP (object)) + buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset); + else if (STRINGP (object)) + buf = offset + XSTRING (object)->data; + } + } + object = XPROCESS (proc)->encoding_buf; + encode_coding (coding, buf, XSTRING (object)->data, + len, STRING_BYTES (XSTRING (object))); + len = coding->produced; + buf = XSTRING (object)->data; + if (temp_buf) + xfree (temp_buf); + } + +#ifdef VMS + vs = get_vms_process_pointer (p->pid); + if (vs == 0) + error ("Could not find this process: %x", p->pid); + else if (write_to_vms_process (vs, buf, len)) + ; +#else + + if (pty_max_bytes == 0) + { +#if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON) + pty_max_bytes = fpathconf (XFASTINT (XPROCESS (proc)->outfd), + _PC_MAX_CANON); + if (pty_max_bytes < 0) + pty_max_bytes = 250; +#else + pty_max_bytes = 250; +#endif + /* Deduct one, to leave space for the eof. */ + pty_max_bytes--; + } + + if (!setjmp (send_process_frame)) + while (len > 0) + { + int this = len; + SIGTYPE (*old_sigpipe)(); + + /* Decide how much data we can send in one batch. + Long lines need to be split into multiple batches. */ + if (!NILP (XPROCESS (proc)->pty_flag)) + { + /* Starting this at zero is always correct when not the first iteration + because the previous iteration ended by sending C-d. + It may not be correct for the first iteration + if a partial line was sent in a separate send_process call. + If that proves worth handling, we need to save linepos + in the process object. */ + int linepos = 0; + unsigned char *ptr = buf; + unsigned char *end = buf + len; + + /* Scan through this text for a line that is too long. */ + while (ptr != end && linepos < pty_max_bytes) + { + if (*ptr == '\n') + linepos = 0; + else + linepos++; + ptr++; + } + /* If we found one, break the line there + and put in a C-d to force the buffer through. */ + this = ptr - buf; + } + + /* Send this batch, using one or more write calls. */ + while (this > 0) + { + old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap); + rv = emacs_write (XINT (XPROCESS (proc)->outfd), buf, this); + signal (SIGPIPE, old_sigpipe); + + if (rv < 0) + { + if (0 +#ifdef EWOULDBLOCK + || errno == EWOULDBLOCK +#endif +#ifdef EAGAIN + || errno == EAGAIN +#endif + ) + /* Buffer is full. Wait, accepting input; + that may allow the program + to finish doing output and read more. */ + { + Lisp_Object zero; + int offset; + + /* Running filters might relocate buffers or strings. + Arrange to relocate BUF. */ + if (BUFFERP (object)) + offset = BUF_PTR_BYTE_POS (XBUFFER (object), buf); + else if (STRINGP (object)) + offset = buf - XSTRING (object)->data; + + XSETFASTINT (zero, 0); +#ifdef EMACS_HAS_USECS + wait_reading_process_input (0, 20000, zero, 0); +#else + wait_reading_process_input (1, 0, zero, 0); +#endif + + if (BUFFERP (object)) + buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset); + else if (STRINGP (object)) + buf = offset + XSTRING (object)->data; + + rv = 0; + } + else + /* This is a real error. */ + report_file_error ("writing to process", Fcons (proc, Qnil)); + } + buf += rv; + len -= rv; + this -= rv; + } + + /* If we sent just part of the string, put in an EOF + to force it through, before we send the rest. */ + if (len > 0) + Fprocess_send_eof (proc); + } +#endif + else + { + XPROCESS (proc)->raw_status_low = Qnil; + XPROCESS (proc)->raw_status_high = Qnil; + XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil)); + XSETINT (XPROCESS (proc)->tick, ++process_tick); + deactivate_process (proc); +#ifdef VMS + error ("Error writing to process %s; closed it", procname); +#else + error ("SIGPIPE raised on process %s; closed it", procname); +#endif + } + + UNGCPRO; +} + +DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region, + 3, 3, 0, + "Send current contents of region as input to PROCESS.\n\ +PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ +nil, indicating the current buffer's process.\n\ +Called from program, takes three arguments, PROCESS, START and END.\n\ +If the region is more than 500 characters long,\n\ +it is sent in several bunches. This may happen even for shorter regions.\n\ +Output from processes can arrive in between bunches.") + (process, start, end) + Lisp_Object process, start, end; +{ + Lisp_Object proc; + int start1, end1; + + proc = get_process (process); + validate_region (&start, &end); + + if (XINT (start) < GPT && XINT (end) > GPT) + move_gap (XINT (start)); + + start1 = CHAR_TO_BYTE (XINT (start)); + end1 = CHAR_TO_BYTE (XINT (end)); + send_process (proc, BYTE_POS_ADDR (start1), end1 - start1, + Fcurrent_buffer ()); + + return Qnil; +} + +DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string, + 2, 2, 0, + "Send PROCESS the contents of STRING as input.\n\ +PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ +nil, indicating the current buffer's process.\n\ +If STRING is more than 500 characters long,\n\ +it is sent in several bunches. This may happen even for shorter strings.\n\ +Output from processes can arrive in between bunches.") + (process, string) + Lisp_Object process, string; +{ + Lisp_Object proc; + CHECK_STRING (string, 1); + proc = get_process (process); + send_process (proc, XSTRING (string)->data, + STRING_BYTES (XSTRING (string)), string); + return Qnil; +} + +DEFUN ("process-running-child-p", Fprocess_running_child_p, + Sprocess_running_child_p, 0, 1, 0, + "Return t if PROCESS has given the terminal to a child.\n\ +If the operating system does not make it possible to find out,\n\ +return t unconditionally.") + (process) + Lisp_Object process; +{ + /* Initialize in case ioctl doesn't exist or gives an error, + in a way that will cause returning t. */ + int gid = 0; + Lisp_Object proc; + struct Lisp_Process *p; + + proc = get_process (process); + p = XPROCESS (proc); + + if (!EQ (p->childp, Qt)) + error ("Process %s is not a subprocess", + XSTRING (p->name)->data); + if (XINT (p->infd) < 0) + error ("Process %s is not active", + XSTRING (p->name)->data); + +#ifdef TIOCGPGRP + if (!NILP (p->subtty)) + ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid); + else + ioctl (XINT (p->infd), TIOCGPGRP, &gid); +#endif /* defined (TIOCGPGRP ) */ + + if (gid == XFASTINT (p->pid)) + return Qnil; + return Qt; +} + +/* send a signal number SIGNO to PROCESS. + If CURRENT_GROUP is t, that means send to the process group + that currently owns the terminal being used to communicate with PROCESS. + This is used for various commands in shell mode. + If CURRENT_GROUP is lambda, that means send to the process group + that currently owns the terminal, but only if it is NOT the shell itself. + + If NOMSG is zero, insert signal-announcements into process's buffers + right away. + + If we can, we try to signal PROCESS by sending control characters + down the pty. This allows us to signal inferiors who have changed + their uid, for which killpg would return an EPERM error. */ + +static void +process_send_signal (process, signo, current_group, nomsg) + Lisp_Object process; + int signo; + Lisp_Object current_group; + int nomsg; +{ + Lisp_Object proc; + register struct Lisp_Process *p; + int gid; + int no_pgrp = 0; + + proc = get_process (process); + p = XPROCESS (proc); + + if (!EQ (p->childp, Qt)) + error ("Process %s is not a subprocess", + XSTRING (p->name)->data); + if (XINT (p->infd) < 0) + error ("Process %s is not active", + XSTRING (p->name)->data); + + if (NILP (p->pty_flag)) + current_group = Qnil; + + /* If we are using pgrps, get a pgrp number and make it negative. */ + if (!NILP (current_group)) + { +#ifdef SIGNALS_VIA_CHARACTERS + /* If possible, send signals to the entire pgrp + by sending an input character to it. */ + + /* TERMIOS is the latest and bestest, and seems most likely to + work. If the system has it, use it. */ +#ifdef HAVE_TERMIOS + struct termios t; + + switch (signo) + { + case SIGINT: + tcgetattr (XINT (p->infd), &t); + send_process (proc, &t.c_cc[VINTR], 1, Qnil); + return; + + case SIGQUIT: + tcgetattr (XINT (p->infd), &t); + send_process (proc, &t.c_cc[VQUIT], 1, Qnil); + return; + + case SIGTSTP: + tcgetattr (XINT (p->infd), &t); +#if defined (VSWTCH) && !defined (PREFER_VSUSP) + send_process (proc, &t.c_cc[VSWTCH], 1, Qnil); +#else + send_process (proc, &t.c_cc[VSUSP], 1, Qnil); +#endif + return; + } + +#else /* ! HAVE_TERMIOS */ + + /* On Berkeley descendants, the following IOCTL's retrieve the + current control characters. */ +#if defined (TIOCGLTC) && defined (TIOCGETC) + + struct tchars c; + struct ltchars lc; + + switch (signo) + { + case SIGINT: + ioctl (XINT (p->infd), TIOCGETC, &c); + send_process (proc, &c.t_intrc, 1, Qnil); + return; + case SIGQUIT: + ioctl (XINT (p->infd), TIOCGETC, &c); + send_process (proc, &c.t_quitc, 1, Qnil); + return; +#ifdef SIGTSTP + case SIGTSTP: + ioctl (XINT (p->infd), TIOCGLTC, &lc); + send_process (proc, &lc.t_suspc, 1, Qnil); + return; +#endif /* ! defined (SIGTSTP) */ + } + +#else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ + + /* On SYSV descendants, the TCGETA ioctl retrieves the current control + characters. */ +#ifdef TCGETA + struct termio t; + switch (signo) + { + case SIGINT: + ioctl (XINT (p->infd), TCGETA, &t); + send_process (proc, &t.c_cc[VINTR], 1, Qnil); + return; + case SIGQUIT: + ioctl (XINT (p->infd), TCGETA, &t); + send_process (proc, &t.c_cc[VQUIT], 1, Qnil); + return; +#ifdef SIGTSTP + case SIGTSTP: + ioctl (XINT (p->infd), TCGETA, &t); + send_process (proc, &t.c_cc[VSWTCH], 1, Qnil); + return; +#endif /* ! defined (SIGTSTP) */ + } +#else /* ! defined (TCGETA) */ + Your configuration files are messed up. + /* If your system configuration files define SIGNALS_VIA_CHARACTERS, + you'd better be using one of the alternatives above! */ +#endif /* ! defined (TCGETA) */ +#endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ +#endif /* ! defined HAVE_TERMIOS */ +#endif /* ! defined (SIGNALS_VIA_CHARACTERS) */ + +#ifdef TIOCGPGRP + /* Get the pgrp using the tty itself, if we have that. + Otherwise, use the pty to get the pgrp. + On pfa systems, [email protected] writes: + "TIOCGPGRP symbol defined in sys/ioctl.h at E50. + But, TIOCGPGRP does not work on E50 ;-P works fine on E60" + His patch indicates that if TIOCGPGRP returns an error, then + we should just assume that p->pid is also the process group id. */ + { + int err; + + if (!NILP (p->subtty)) + err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid); + else + err = ioctl (XINT (p->infd), TIOCGPGRP, &gid); + +#ifdef pfa + if (err == -1) + gid = - XFASTINT (p->pid); +#endif /* ! defined (pfa) */ + } + if (gid == -1) + no_pgrp = 1; + else + gid = - gid; +#else /* ! defined (TIOCGPGRP ) */ + /* Can't select pgrps on this system, so we know that + the child itself heads the pgrp. */ + gid = - XFASTINT (p->pid); +#endif /* ! defined (TIOCGPGRP ) */ + + /* If current_group is lambda, and the shell owns the terminal, + don't send any signal. */ + if (EQ (current_group, Qlambda) && gid == - XFASTINT (p->pid)) + return; + } + else + gid = - XFASTINT (p->pid); + + switch (signo) + { +#ifdef SIGCONT + case SIGCONT: + p->raw_status_low = Qnil; + p->raw_status_high = Qnil; + p->status = Qrun; + XSETINT (p->tick, ++process_tick); + if (!nomsg) + status_notify (); + break; +#endif /* ! defined (SIGCONT) */ + case SIGINT: +#ifdef VMS + send_process (proc, "\003", 1, Qnil); /* ^C */ + goto whoosh; +#endif + case SIGQUIT: +#ifdef VMS + send_process (proc, "\031", 1, Qnil); /* ^Y */ + goto whoosh; +#endif + case SIGKILL: +#ifdef VMS + sys$forcex (&(XFASTINT (p->pid)), 0, 1); + whoosh: +#endif + flush_pending_output (XINT (p->infd)); + break; + } + + /* If we don't have process groups, send the signal to the immediate + subprocess. That isn't really right, but it's better than any + obvious alternative. */ + if (no_pgrp) + { + kill (XFASTINT (p->pid), signo); + return; + } + + /* gid may be a pid, or minus a pgrp's number */ +#ifdef TIOCSIGSEND + if (!NILP (current_group)) + ioctl (XINT (p->infd), TIOCSIGSEND, signo); + else + { + gid = - XFASTINT (p->pid); + kill (gid, signo); + } +#else /* ! defined (TIOCSIGSEND) */ + EMACS_KILLPG (-gid, signo); +#endif /* ! defined (TIOCSIGSEND) */ +} + +DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0, + "Interrupt process PROCESS.\n\ +PROCESS may be a process, a buffer, or the name of a process or buffer.\n\ +nil or no arg means current buffer's process.\n\ +Second arg CURRENT-GROUP non-nil means send signal to\n\ +the current process-group of the process's controlling terminal\n\ +rather than to the process's own process group.\n\ +If the process is a shell, this means interrupt current subjob\n\ +rather than the shell.\n\ +\n\ +If CURRENT-GROUP is `lambda', and if the shell owns the terminal,\n\ +don't send the signal.") + (process, current_group) + Lisp_Object process, current_group; +{ + process_send_signal (process, SIGINT, current_group, 0); + return process; +} + +DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0, + "Kill process PROCESS. May be process or name of one.\n\ +See function `interrupt-process' for more details on usage.") + (process, current_group) + Lisp_Object process, current_group; +{ + process_send_signal (process, SIGKILL, current_group, 0); + return process; +} + +DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0, + "Send QUIT signal to process PROCESS. May be process or name of one.\n\ +See function `interrupt-process' for more details on usage.") + (process, current_group) + Lisp_Object process, current_group; +{ + process_send_signal (process, SIGQUIT, current_group, 0); + return process; +} + +DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0, + "Stop process PROCESS. May be process or name of one.\n\ +See function `interrupt-process' for more details on usage.") + (process, current_group) + Lisp_Object process, current_group; +{ +#ifndef SIGTSTP + error ("no SIGTSTP support"); +#else + process_send_signal (process, SIGTSTP, current_group, 0); +#endif + return process; +} + +DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0, + "Continue process PROCESS. May be process or name of one.\n\ +See function `interrupt-process' for more details on usage.") + (process, current_group) + Lisp_Object process, current_group; +{ +#ifdef SIGCONT + process_send_signal (process, SIGCONT, current_group, 0); +#else + error ("no SIGCONT support"); +#endif + return process; +} + +DEFUN ("signal-process", Fsignal_process, Ssignal_process, + 2, 2, "nProcess number: \nnSignal code: ", + "Send the process with process id PID the signal with code SIGCODE.\n\ +PID must be an integer. The process need not be a child of this Emacs.\n\ +SIGCODE may be an integer, or a symbol whose name is a signal name.") + (pid, sigcode) + Lisp_Object pid, sigcode; +{ + CHECK_NUMBER (pid, 0); + +#define handle_signal(NAME, VALUE) \ + else if (!strcmp (name, NAME)) \ + XSETINT (sigcode, VALUE) + + if (INTEGERP (sigcode)) + ; + else + { + unsigned char *name; + + CHECK_SYMBOL (sigcode, 1); + name = XSYMBOL (sigcode)->name->data; + + if (0) + ; +#ifdef SIGHUP + handle_signal ("SIGHUP", SIGHUP); +#endif +#ifdef SIGINT + handle_signal ("SIGINT", SIGINT); +#endif +#ifdef SIGQUIT + handle_signal ("SIGQUIT", SIGQUIT); +#endif +#ifdef SIGILL + handle_signal ("SIGILL", SIGILL); +#endif +#ifdef SIGABRT + handle_signal ("SIGABRT", SIGABRT); +#endif +#ifdef SIGEMT + handle_signal ("SIGEMT", SIGEMT); +#endif +#ifdef SIGKILL + handle_signal ("SIGKILL", SIGKILL); +#endif +#ifdef SIGFPE + handle_signal ("SIGFPE", SIGFPE); +#endif +#ifdef SIGBUS + handle_signal ("SIGBUS", SIGBUS); +#endif +#ifdef SIGSEGV + handle_signal ("SIGSEGV", SIGSEGV); +#endif +#ifdef SIGSYS + handle_signal ("SIGSYS", SIGSYS); +#endif +#ifdef SIGPIPE + handle_signal ("SIGPIPE", SIGPIPE); +#endif +#ifdef SIGALRM + handle_signal ("SIGALRM", SIGALRM); +#endif +#ifdef SIGTERM + handle_signal ("SIGTERM", SIGTERM); +#endif +#ifdef SIGURG + handle_signal ("SIGURG", SIGURG); +#endif +#ifdef SIGSTOP + handle_signal ("SIGSTOP", SIGSTOP); +#endif +#ifdef SIGTSTP + handle_signal ("SIGTSTP", SIGTSTP); +#endif +#ifdef SIGCONT + handle_signal ("SIGCONT", SIGCONT); +#endif +#ifdef SIGCHLD + handle_signal ("SIGCHLD", SIGCHLD); +#endif +#ifdef SIGTTIN + handle_signal ("SIGTTIN", SIGTTIN); +#endif +#ifdef SIGTTOU + handle_signal ("SIGTTOU", SIGTTOU); +#endif +#ifdef SIGIO + handle_signal ("SIGIO", SIGIO); +#endif +#ifdef SIGXCPU + handle_signal ("SIGXCPU", SIGXCPU); +#endif +#ifdef SIGXFSZ + handle_signal ("SIGXFSZ", SIGXFSZ); +#endif +#ifdef SIGVTALRM + handle_signal ("SIGVTALRM", SIGVTALRM); +#endif +#ifdef SIGPROF + handle_signal ("SIGPROF", SIGPROF); +#endif +#ifdef SIGWINCH + handle_signal ("SIGWINCH", SIGWINCH); +#endif +#ifdef SIGINFO + handle_signal ("SIGINFO", SIGINFO); +#endif +#ifdef SIGUSR1 + handle_signal ("SIGUSR1", SIGUSR1); +#endif +#ifdef SIGUSR2 + handle_signal ("SIGUSR2", SIGUSR2); +#endif + else + error ("Undefined signal name %s", name); + } + +#undef handle_signal + + return make_number (kill (XINT (pid), XINT (sigcode))); +} + +DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0, + "Make PROCESS see end-of-file in its input.\n\ +EOF comes after any text already sent to it.\n\ +PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ +nil, indicating the current buffer's process.\n\ +If PROCESS is a network connection, or is a process communicating\n\ +through a pipe (as opposed to a pty), then you cannot send any more\n\ +text to PROCESS after you call this function.") + (process) + Lisp_Object process; +{ + Lisp_Object proc; + struct coding_system *coding; + + proc = get_process (process); + coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)]; + + /* Make sure the process is really alive. */ + if (! NILP (XPROCESS (proc)->raw_status_low)) + update_status (XPROCESS (proc)); + if (! EQ (XPROCESS (proc)->status, Qrun)) + error ("Process %s not running", XSTRING (XPROCESS (proc)->name)->data); + + if (CODING_REQUIRE_FLUSHING (coding)) + { + coding->mode |= CODING_MODE_LAST_BLOCK; + send_process (proc, "", 0, Qnil); + } + +#ifdef VMS + send_process (proc, "\032", 1, Qnil); /* ^z */ +#else + if (!NILP (XPROCESS (proc)->pty_flag)) + send_process (proc, "\004", 1, Qnil); + else + { + int old_outfd, new_outfd; + +#ifdef HAVE_SHUTDOWN + /* If this is a network connection, or socketpair is used + for communication with the subprocess, call shutdown to cause EOF. + (In some old system, shutdown to socketpair doesn't work. + Then we just can't win.) */ + if (NILP (XPROCESS (proc)->pid) + || XINT (XPROCESS (proc)->outfd) == XINT (XPROCESS (proc)->infd)) + shutdown (XINT (XPROCESS (proc)->outfd), 1); + /* In case of socketpair, outfd == infd, so don't close it. */ + if (XINT (XPROCESS (proc)->outfd) != XINT (XPROCESS (proc)->infd)) + emacs_close (XINT (XPROCESS (proc)->outfd)); +#else /* not HAVE_SHUTDOWN */ + emacs_close (XINT (XPROCESS (proc)->outfd)); +#endif /* not HAVE_SHUTDOWN */ + new_outfd = emacs_open (NULL_DEVICE, O_WRONLY, 0); + old_outfd = XINT (XPROCESS (proc)->outfd); + + if (!proc_encode_coding_system[new_outfd]) + proc_encode_coding_system[new_outfd] + = (struct coding_system *) xmalloc (sizeof (struct coding_system)); + bcopy (proc_encode_coding_system[old_outfd], + proc_encode_coding_system[new_outfd], + sizeof (struct coding_system)); + bzero (proc_encode_coding_system[old_outfd], + sizeof (struct coding_system)); + + XSETINT (XPROCESS (proc)->outfd, new_outfd); + } +#endif /* VMS */ + return process; +} + +/* Kill all processes associated with `buffer'. + If `buffer' is nil, kill all processes */ + +void +kill_buffer_processes (buffer) + Lisp_Object buffer; +{ + Lisp_Object tail, proc; + + for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail)) + { + proc = XCDR (XCAR (tail)); + if (GC_PROCESSP (proc) + && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer))) + { + if (NETCONN_P (proc)) + Fdelete_process (proc); + else if (XINT (XPROCESS (proc)->infd) >= 0) + process_send_signal (proc, SIGHUP, Qnil, 1); + } + } +} + +/* On receipt of a signal that a child status has changed, + loop asking about children with changed statuses until + the system says there are no more. + All we do is change the status; + we do not run sentinels or print notifications. + That is saved for the next time keyboard input is done, + in order to avoid timing errors. */ + +/** WARNING: this can be called during garbage collection. + Therefore, it must not be fooled by the presence of mark bits in + Lisp objects. */ + +/** USG WARNING: Although it is not obvious from the documentation + in signal(2), on a USG system the SIGCLD handler MUST NOT call + signal() before executing at least one wait(), otherwise the handler + will be called again, resulting in an infinite loop. The relevant + portion of the documentation reads "SIGCLD signals will be queued + and the signal-catching function will be continually reentered until + the queue is empty". Invoking signal() causes the kernel to reexamine + the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */ + +SIGTYPE +sigchld_handler (signo) + int signo; +{ + int old_errno = errno; + Lisp_Object proc; + register struct Lisp_Process *p; + extern EMACS_TIME *input_available_clear_time; + +#ifdef BSD4_1 + extern int sigheld; + sigheld |= sigbit (SIGCHLD); +#endif + + while (1) + { + register int pid; + WAITTYPE w; + Lisp_Object tail; + +#ifdef WNOHANG +#ifndef WUNTRACED +#define WUNTRACED 0 +#endif /* no WUNTRACED */ + /* Keep trying to get a status until we get a definitive result. */ + do + { + errno = 0; + pid = wait3 (&w, WNOHANG | WUNTRACED, 0); + } + while (pid <= 0 && errno == EINTR); + + if (pid <= 0) + { + /* A real failure. We have done all our job, so return. */ + + /* USG systems forget handlers when they are used; + must reestablish each time */ +#if defined (USG) && !defined (POSIX_SIGNALS) + signal (signo, sigchld_handler); /* WARNING - must come after wait3() */ +#endif +#ifdef BSD4_1 + sigheld &= ~sigbit (SIGCHLD); + sigrelse (SIGCHLD); +#endif + errno = old_errno; + return; + } +#else + pid = wait (&w); +#endif /* no WNOHANG */ + + /* Find the process that signaled us, and record its status. */ + + p = 0; + for (tail = Vprocess_alist; CONSP (tail); tail = XCDR (tail)) + { + proc = XCDR (XCAR (tail)); + p = XPROCESS (proc); + if (EQ (p->childp, Qt) && XFASTINT (p->pid) == pid) + break; + p = 0; + } + + /* Look for an asynchronous process whose pid hasn't been filled + in yet. */ + if (p == 0) + for (tail = Vprocess_alist; CONSP (tail); tail = XCDR (tail)) + { + proc = XCDR (XCAR (tail)); + p = XPROCESS (proc); + if (INTEGERP (p->pid) && XINT (p->pid) == -1) + break; + p = 0; + } + + /* Change the status of the process that was found. */ + if (p != 0) + { + union { int i; WAITTYPE wt; } u; + int clear_desc_flag = 0; + + XSETINT (p->tick, ++process_tick); + u.wt = w; + XSETINT (p->raw_status_low, u.i & 0xffff); + XSETINT (p->raw_status_high, u.i >> 16); + + /* If process has terminated, stop waiting for its output. */ + if ((WIFSIGNALED (w) || WIFEXITED (w)) + && XINT (p->infd) >= 0) + clear_desc_flag = 1; + + /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */ + if (clear_desc_flag) + { + FD_CLR (XINT (p->infd), &input_wait_mask); + FD_CLR (XINT (p->infd), &non_keyboard_wait_mask); + } + + /* Tell wait_reading_process_input that it needs to wake up and + look around. */ + if (input_available_clear_time) + EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); + } + + /* There was no asynchronous process found for that id. Check + if we have a synchronous process. */ + else + { + synch_process_alive = 0; + + /* Report the status of the synchronous process. */ + if (WIFEXITED (w)) + synch_process_retcode = WRETCODE (w); + else if (WIFSIGNALED (w)) + { + int code = WTERMSIG (w); + char *signame; + + synchronize_system_messages_locale (); + signame = strsignal (code); + + if (signame == 0) + signame = "unknown"; + + synch_process_death = signame; + } + + /* Tell wait_reading_process_input that it needs to wake up and + look around. */ + if (input_available_clear_time) + EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); + } + + /* On some systems, we must return right away. + If any more processes want to signal us, we will + get another signal. + Otherwise (on systems that have WNOHANG), loop around + to use up all the processes that have something to tell us. */ +#if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) || defined (WINDOWSNT) +#if defined (USG) && ! defined (POSIX_SIGNALS) + signal (signo, sigchld_handler); +#endif + errno = old_errno; + return; +#endif /* USG, but not HPUX with WNOHANG */ + } +} + + +static Lisp_Object +exec_sentinel_unwind (data) + Lisp_Object data; +{ + XPROCESS (XCAR (data))->sentinel = XCDR (data); + return Qnil; +} + +static Lisp_Object +exec_sentinel_error_handler (error) + Lisp_Object error; +{ + cmd_error_internal (error, "error in process sentinel: "); + Vinhibit_quit = Qt; + update_echo_area (); + Fsleep_for (make_number (2), Qnil); +} + +static void +exec_sentinel (proc, reason) + Lisp_Object proc, reason; +{ + Lisp_Object sentinel, obuffer, odeactivate, okeymap; + register struct Lisp_Process *p = XPROCESS (proc); + int count = specpdl_ptr - specpdl; + int outer_running_asynch_code = running_asynch_code; + int waiting = waiting_for_user_input_p; + + /* No need to gcpro these, because all we do with them later + is test them for EQness, and none of them should be a string. */ + odeactivate = Vdeactivate_mark; + XSETBUFFER (obuffer, current_buffer); + okeymap = current_buffer->keymap; + + sentinel = p->sentinel; + if (NILP (sentinel)) + return; + + /* Zilch the sentinel while it's running, to avoid recursive invocations; + assure that it gets restored no matter how the sentinel exits. */ + p->sentinel = Qnil; + record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel)); + /* Inhibit quit so that random quits don't screw up a running filter. */ + specbind (Qinhibit_quit, Qt); + specbind (Qlast_nonmenu_event, Qt); + + /* In case we get recursively called, + and we already saved the match data nonrecursively, + save the same match data in safely recursive fashion. */ + if (outer_running_asynch_code) + { + Lisp_Object tem; + tem = Fmatch_data (Qnil, Qnil); + restore_match_data (); + record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); + Fset_match_data (tem); + } + + /* For speed, if a search happens within this code, + save the match data in a special nonrecursive fashion. */ + running_asynch_code = 1; + + internal_condition_case_1 (read_process_output_call, + Fcons (sentinel, + Fcons (proc, Fcons (reason, Qnil))), + !NILP (Vdebug_on_error) ? Qnil : Qerror, + exec_sentinel_error_handler); + + /* If we saved the match data nonrecursively, restore it now. */ + restore_match_data (); + running_asynch_code = outer_running_asynch_code; + + Vdeactivate_mark = odeactivate; + + /* Restore waiting_for_user_input_p as it was + when we were called, in case the filter clobbered it. */ + waiting_for_user_input_p = waiting; + +#if 0 + if (! EQ (Fcurrent_buffer (), obuffer) + || ! EQ (current_buffer->keymap, okeymap)) +#endif + /* But do it only if the caller is actually going to read events. + Otherwise there's no need to make him wake up, and it could + cause trouble (for example it would make Fsit_for return). */ + if (waiting_for_user_input_p == -1) + record_asynch_buffer_change (); + + unbind_to (count, Qnil); +} + +/* Report all recent events of a change in process status + (either run the sentinel or output a message). + This is done while Emacs is waiting for keyboard input. */ + +void +status_notify () +{ + register Lisp_Object proc, buffer; + Lisp_Object tail, msg; + struct gcpro gcpro1, gcpro2; + + tail = Qnil; + msg = Qnil; + /* We need to gcpro tail; if read_process_output calls a filter + which deletes a process and removes the cons to which tail points + from Vprocess_alist, and then causes a GC, tail is an unprotected + reference. */ + GCPRO2 (tail, msg); + + /* Set this now, so that if new processes are created by sentinels + that we run, we get called again to handle their status changes. */ + update_tick = process_tick; + + for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) + { + Lisp_Object symbol; + register struct Lisp_Process *p; + + proc = Fcdr (Fcar (tail)); + p = XPROCESS (proc); + + if (XINT (p->tick) != XINT (p->update_tick)) + { + XSETINT (p->update_tick, XINT (p->tick)); + + /* If process is still active, read any output that remains. */ + while (! EQ (p->filter, Qt) + && XINT (p->infd) >= 0 + && read_process_output (proc, XINT (p->infd)) > 0); + + buffer = p->buffer; + + /* Get the text to use for the message. */ + if (!NILP (p->raw_status_low)) + update_status (p); + msg = status_message (p->status); + + /* If process is terminated, deactivate it or delete it. */ + symbol = p->status; + if (CONSP (p->status)) + symbol = XCAR (p->status); + + if (EQ (symbol, Qsignal) || EQ (symbol, Qexit) + || EQ (symbol, Qclosed)) + { + if (delete_exited_processes) + remove_process (proc); + else + deactivate_process (proc); + } + + /* The actions above may have further incremented p->tick. + So set p->update_tick again + so that an error in the sentinel will not cause + this code to be run again. */ + XSETINT (p->update_tick, XINT (p->tick)); + /* Now output the message suitably. */ + if (!NILP (p->sentinel)) + exec_sentinel (proc, msg); + /* Don't bother with a message in the buffer + when a process becomes runnable. */ + else if (!EQ (symbol, Qrun) && !NILP (buffer)) + { + Lisp_Object ro, tem; + struct buffer *old = current_buffer; + int opoint, opoint_byte; + int before, before_byte; + + ro = XBUFFER (buffer)->read_only; + + /* Avoid error if buffer is deleted + (probably that's why the process is dead, too) */ + if (NILP (XBUFFER (buffer)->name)) + continue; + Fset_buffer (buffer); + + opoint = PT; + opoint_byte = PT_BYTE; + /* Insert new output into buffer + at the current end-of-output marker, + thus preserving logical ordering of input and output. */ + if (XMARKER (p->mark)->buffer) + Fgoto_char (p->mark); + else + SET_PT_BOTH (ZV, ZV_BYTE); + + before = PT; + before_byte = PT_BYTE; + + tem = current_buffer->read_only; + current_buffer->read_only = Qnil; + insert_string ("\nProcess "); + Finsert (1, &p->name); + insert_string (" "); + Finsert (1, &msg); + current_buffer->read_only = tem; + set_marker_both (p->mark, p->buffer, PT, PT_BYTE); + + if (opoint >= before) + SET_PT_BOTH (opoint + (PT - before), + opoint_byte + (PT_BYTE - before_byte)); + else + SET_PT_BOTH (opoint, opoint_byte); + + set_buffer_internal (old); + } + } + } /* end for */ + + update_mode_lines++; /* in case buffers use %s in mode-line-format */ + redisplay_preserve_echo_area (); + + UNGCPRO; +} + + +DEFUN ("set-process-coding-system", Fset_process_coding_system, + Sset_process_coding_system, 1, 3, 0, + "Set coding systems of PROCESS to DECODING and ENCODING.\n\ +DECODING will be used to decode subprocess output and ENCODING to\n\ +encode subprocess input.") + (proc, decoding, encoding) + register Lisp_Object proc, decoding, encoding; +{ + register struct Lisp_Process *p; + + CHECK_PROCESS (proc, 0); + p = XPROCESS (proc); + if (XINT (p->infd) < 0) + error ("Input file descriptor of %s closed", XSTRING (p->name)->data); + if (XINT (p->outfd) < 0) + error ("Output file descriptor of %s closed", XSTRING (p->name)->data); + + p->decode_coding_system = Fcheck_coding_system (decoding); + p->encode_coding_system = Fcheck_coding_system (encoding); + setup_coding_system (decoding, + proc_decode_coding_system[XINT (p->infd)]); + setup_coding_system (encoding, + proc_encode_coding_system[XINT (p->outfd)]); + + return Qnil; +} + +DEFUN ("process-coding-system", + Fprocess_coding_system, Sprocess_coding_system, 1, 1, 0, + "Return a cons of coding systems for decoding and encoding of PROCESS.") + (proc) + register Lisp_Object proc; +{ + CHECK_PROCESS (proc, 0); + return Fcons (XPROCESS (proc)->decode_coding_system, + XPROCESS (proc)->encode_coding_system); +} + +/* The first time this is called, assume keyboard input comes from DESC + instead of from where we used to expect it. + Subsequent calls mean assume input keyboard can come from DESC + in addition to other places. */ + +static int add_keyboard_wait_descriptor_called_flag; + +void +add_keyboard_wait_descriptor (desc) + int desc; +{ + if (! add_keyboard_wait_descriptor_called_flag) + FD_CLR (0, &input_wait_mask); + add_keyboard_wait_descriptor_called_flag = 1; + FD_SET (desc, &input_wait_mask); + FD_SET (desc, &non_process_wait_mask); + if (desc > max_keyboard_desc) + max_keyboard_desc = desc; +} + +/* From now on, do not expect DESC to give keyboard input. */ + +void +delete_keyboard_wait_descriptor (desc) + int desc; +{ + int fd; + int lim = max_keyboard_desc; + + FD_CLR (desc, &input_wait_mask); + FD_CLR (desc, &non_process_wait_mask); + + if (desc == max_keyboard_desc) + for (fd = 0; fd < lim; fd++) + if (FD_ISSET (fd, &input_wait_mask) + && !FD_ISSET (fd, &non_keyboard_wait_mask)) + max_keyboard_desc = fd; +} + +/* Return nonzero if *MASK has a bit set + that corresponds to one of the keyboard input descriptors. */ + +int +keyboard_bit_set (mask) + SELECT_TYPE *mask; +{ + int fd; + + for (fd = 0; fd <= max_keyboard_desc; fd++) + if (FD_ISSET (fd, mask) && FD_ISSET (fd, &input_wait_mask) + && !FD_ISSET (fd, &non_keyboard_wait_mask)) + return 1; + + return 0; +} + +void +init_process () +{ + register int i; + +#ifdef SIGCHLD +#ifndef CANNOT_DUMP + if (! noninteractive || initialized) +#endif + signal (SIGCHLD, sigchld_handler); +#endif + + FD_ZERO (&input_wait_mask); + FD_ZERO (&non_keyboard_wait_mask); + FD_ZERO (&non_process_wait_mask); + max_process_desc = 0; + + FD_SET (0, &input_wait_mask); + + Vprocess_alist = Qnil; + for (i = 0; i < MAXDESC; i++) + { + chan_process[i] = Qnil; + proc_buffered_char[i] = -1; + } + bzero (proc_decode_coding_system, sizeof proc_decode_coding_system); + bzero (proc_encode_coding_system, sizeof proc_encode_coding_system); + + Vdefault_process_coding_system + = (NILP (buffer_defaults.enable_multibyte_characters) + ? Fcons (Qraw_text, Qnil) + : Fcons (Qemacs_mule, Qnil)); +} + +void +syms_of_process () +{ + Qprocessp = intern ("processp"); + staticpro (&Qprocessp); + Qrun = intern ("run"); + staticpro (&Qrun); + Qstop = intern ("stop"); + staticpro (&Qstop); + Qsignal = intern ("signal"); + staticpro (&Qsignal); + + /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it + here again. + + Qexit = intern ("exit"); + staticpro (&Qexit); */ + + Qopen = intern ("open"); + staticpro (&Qopen); + Qclosed = intern ("closed"); + staticpro (&Qclosed); + + Qlast_nonmenu_event = intern ("last-nonmenu-event"); + staticpro (&Qlast_nonmenu_event); + + staticpro (&Vprocess_alist); + + DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes, + "*Non-nil means delete processes immediately when they exit.\n\ +nil means don't delete them until `list-processes' is run."); + + delete_exited_processes = 1; + + DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type, + "Control type of device used to communicate with subprocesses.\n\ +Values are nil to use a pipe, or t or `pty' to use a pty.\n\ +The value has no effect if the system has no ptys or if all ptys are busy:\n\ +then a pipe is used in any case.\n\ +The value takes effect when `start-process' is called."); + Vprocess_connection_type = Qt; + + defsubr (&Sprocessp); + defsubr (&Sget_process); + defsubr (&Sget_buffer_process); + defsubr (&Sdelete_process); + defsubr (&Sprocess_status); + defsubr (&Sprocess_exit_status); + defsubr (&Sprocess_id); + defsubr (&Sprocess_name); + defsubr (&Sprocess_tty_name); + defsubr (&Sprocess_command); + defsubr (&Sset_process_buffer); + defsubr (&Sprocess_buffer); + defsubr (&Sprocess_mark); + defsubr (&Sset_process_filter); + defsubr (&Sprocess_filter); + defsubr (&Sset_process_sentinel); + defsubr (&Sprocess_sentinel); + defsubr (&Sset_process_window_size); + defsubr (&Sset_process_inherit_coding_system_flag); + defsubr (&Sprocess_inherit_coding_system_flag); + defsubr (&Sprocess_kill_without_query); + defsubr (&Sprocess_contact); + defsubr (&Slist_processes); + defsubr (&Sprocess_list); + defsubr (&Sstart_process); +#ifdef HAVE_SOCKETS + defsubr (&Sopen_network_stream); +#endif /* HAVE_SOCKETS */ + defsubr (&Saccept_process_output); + defsubr (&Sprocess_send_region); + defsubr (&Sprocess_send_string); + defsubr (&Sinterrupt_process); + defsubr (&Skill_process); + defsubr (&Squit_process); + defsubr (&Sstop_process); + defsubr (&Scontinue_process); + defsubr (&Sprocess_running_child_p); + defsubr (&Sprocess_send_eof); + defsubr (&Ssignal_process); + defsubr (&Swaiting_for_user_input_p); +/* defsubr (&Sprocess_connection); */ + defsubr (&Sset_process_coding_system); + defsubr (&Sprocess_coding_system); +} + + +#else /* not subprocesses */ + +#include <sys/types.h> +#include <errno.h> + +#include "lisp.h" +#include "systime.h" +#include "charset.h" +#include "coding.h" +#include "termopts.h" +#include "sysselect.h" + +extern int frame_garbaged; + +extern EMACS_TIME timer_check (); +extern int timers_run; + +/* As described above, except assuming that there are no subprocesses: + + Wait for timeout to elapse and/or keyboard input to be available. + + time_limit is: + timeout in seconds, or + zero for no limit, or + -1 means gobble data immediately available but don't wait for any. + + read_kbd is a Lisp_Object: + 0 to ignore keyboard input, or + 1 to return when input is available, or + -1 means caller will actually read the input, so don't throw to + the quit handler. + a cons cell, meaning wait until its car is non-nil + (and gobble terminal input into the buffer if any arrives), or + We know that read_kbd will never be a Lisp_Process, since + `subprocesses' isn't defined. + + do_display != 0 means redisplay should be done to show subprocess + output that arrives. + + Return true iff we received input from any process. */ + +int +wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) + int time_limit, microsecs; + Lisp_Object read_kbd; + int do_display; +{ + register int nfds; + EMACS_TIME end_time, timeout; + SELECT_TYPE waitchannels; + int xerrno; + Lisp_Object *wait_for_cell = 0; + + /* If waiting for non-nil in a cell, record where. */ + if (CONSP (read_kbd)) + { + wait_for_cell = &XCAR (read_kbd); + XSETFASTINT (read_kbd, 0); + } + + /* What does time_limit really mean? */ + if (time_limit || microsecs) + { + EMACS_GET_TIME (end_time); + EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); + EMACS_ADD_TIME (end_time, end_time, timeout); + } + + /* Turn off periodic alarms (in case they are in use) + because the select emulator uses alarms. */ + turn_on_atimers (0); + + while (1) + { + int timeout_reduced_for_timers = 0; + + /* If calling from keyboard input, do not quit + since we want to return C-g as an input character. + Otherwise, do pending quit if requested. */ + if (XINT (read_kbd) >= 0) + QUIT; + + /* Exit now if the cell we're waiting for became non-nil. */ + if (wait_for_cell && ! NILP (*wait_for_cell)) + break; + + /* Compute time from now till when time limit is up */ + /* Exit if already run out */ + if (time_limit == -1) + { + /* -1 specified for timeout means + gobble output available now + but don't wait at all. */ + + EMACS_SET_SECS_USECS (timeout, 0, 0); + } + else if (time_limit || microsecs) + { + EMACS_GET_TIME (timeout); + EMACS_SUB_TIME (timeout, end_time, timeout); + if (EMACS_TIME_NEG_P (timeout)) + break; + } + else + { + EMACS_SET_SECS_USECS (timeout, 100000, 0); + } + + /* If our caller will not immediately handle keyboard events, + run timer events directly. + (Callers that will immediately read keyboard events + call timer_delay on their own.) */ + if (! wait_for_cell) + { + EMACS_TIME timer_delay; + int old_timers_run; + + retry: + old_timers_run = timers_run; + timer_delay = timer_check (1); + if (timers_run != old_timers_run && do_display) + { + redisplay_preserve_echo_area (); + /* We must retry, since a timer may have requeued itself + and that could alter the time delay. */ + goto retry; + } + + /* If there is unread keyboard input, also return. */ + if (XINT (read_kbd) != 0 + && requeued_events_pending_p ()) + break; + + if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1) + { + EMACS_TIME difference; + EMACS_SUB_TIME (difference, timer_delay, timeout); + if (EMACS_TIME_NEG_P (difference)) + { + timeout = timer_delay; + timeout_reduced_for_timers = 1; + } + } + } + + /* Cause C-g and alarm signals to take immediate action, + and cause input available signals to zero out timeout. */ + if (XINT (read_kbd) < 0) + set_waiting_for_input (&timeout); + + /* Wait till there is something to do. */ + + if (! XINT (read_kbd) && wait_for_cell == 0) + FD_ZERO (&waitchannels); + else + FD_SET (0, &waitchannels); + + /* If a frame has been newly mapped and needs updating, + reprocess its display stuff. */ + if (frame_garbaged && do_display) + { + clear_waiting_for_input (); + redisplay_preserve_echo_area (); + if (XINT (read_kbd) < 0) + set_waiting_for_input (&timeout); + } + + if (XINT (read_kbd) && detect_input_pending ()) + { + nfds = 0; + FD_ZERO (&waitchannels); + } + else + nfds = select (1, &waitchannels, (SELECT_TYPE *)0, (SELECT_TYPE *)0, + &timeout); + + xerrno = errno; + + /* Make C-g and alarm signals set flags again */ + clear_waiting_for_input (); + + /* If we woke up due to SIGWINCH, actually change size now. */ + do_pending_window_change (0); + + if (time_limit && nfds == 0 && ! timeout_reduced_for_timers) + /* We waited the full specified time, so return now. */ + break; + + if (nfds == -1) + { + /* If the system call was interrupted, then go around the + loop again. */ + if (xerrno == EINTR) + FD_ZERO (&waitchannels); + else + error ("select error: %s", emacs_strerror (xerrno)); + } +#ifdef sun + else if (nfds > 0 && (waitchannels & 1) && interrupt_input) + /* System sometimes fails to deliver SIGIO. */ + kill (getpid (), SIGIO); +#endif +#ifdef SIGIO + if (XINT (read_kbd) && interrupt_input && (waitchannels & 1)) + kill (getpid (), SIGIO); +#endif + + /* Check for keyboard input */ + + if ((XINT (read_kbd) != 0) + && detect_input_pending_run_timers (do_display)) + { + swallow_events (do_display); + if (detect_input_pending_run_timers (do_display)) + break; + } + + /* If there is unread keyboard input, also return. */ + if (XINT (read_kbd) != 0 + && requeued_events_pending_p ()) + break; + + /* If wait_for_cell. check for keyboard input + but don't run any timers. + ??? (It seems wrong to me to check for keyboard + input at all when wait_for_cell, but the code + has been this way since July 1994. + Try changing this after version 19.31.) */ + if (wait_for_cell + && detect_input_pending ()) + { + swallow_events (do_display); + if (detect_input_pending ()) + break; + } + + /* Exit now if the cell we're waiting for became non-nil. */ + if (wait_for_cell && ! NILP (*wait_for_cell)) + break; + } + + start_polling (); + + return 0; +} + + +DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, + /* Don't confuse make-docfile by having two doc strings for this function. + make-docfile does not pay attention to #if, for good reason! */ + 0) + (name) + register Lisp_Object name; +{ + return Qnil; +} + +DEFUN ("process-inherit-coding-system-flag", + Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag, + 1, 1, 0, + /* Don't confuse make-docfile by having two doc strings for this function. + make-docfile does not pay attention to #if, for good reason! */ + 0) + (process) + register Lisp_Object process; +{ + /* Ignore the argument and return the value of + inherit-process-coding-system. */ + return inherit_process_coding_system ? Qt : Qnil; +} + +/* Kill all processes associated with `buffer'. + If `buffer' is nil, kill all processes. + Since we have no subprocesses, this does nothing. */ + +void +kill_buffer_processes (buffer) + Lisp_Object buffer; +{ +} + +void +init_process () +{ +} + +void +syms_of_process () +{ + defsubr (&Sget_buffer_process); + defsubr (&Sprocess_inherit_coding_system_flag); +} + + +#endif /* not subprocesses */ |