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Diffstat (limited to 'src/systime.h')
| -rw-r--r-- | src/systime.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/systime.h b/src/systime.h new file mode 100644 index 0000000000..38902ef62e --- /dev/null +++ b/src/systime.h @@ -0,0 +1,136 @@ +/* systerm.h - System-dependent definitions for time manipulations. + Copyright (C) 1992 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#ifdef NEED_TIME_H + +/* _h_BSDTYPES is checked because on ISC unix, socket.h includes + both time.h and sys/time.h, and the later file is protected + from repeated inclusion. We just hope that other systems will + use this guard either not at all, or similarly. */ +#ifndef _h_BSDTYPES +#include <time.h> +#endif +#else /* not NEED_TIME_H */ +#ifdef HAVE_TIMEVAL +#include <sys/time.h> +#endif /* HAVE_TIMEVAL */ +#endif /* not NEED_TIME_H */ + +/* EMACS_TIME is the type to use to represent temporal intervals - + struct timeval on some systems, int on others. It can be passed as + the timeout argument to the select () system call. + + EMACS_SECS (TIME) is an rvalue for the seconds component of TIME. + EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS. + + EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component. + EMACS_USECS (TIME) is an rvalue for the milliseconds component of TIME. + This returns zero if EMACS_TIME doesn't have a milliseconds component. + EMACS_SET_USECS (TIME, MILLISECONDS) sets that to MILLISECONDS. + This does nothing if EMACS_TIME doesn't have a milliseconds component. + + EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME. + + EMACS_GET_TIME (TIME) stores the current system time in TIME, which + should be an lvalue. + EMACS_SET_UTIMES (PATH, ATIME, MTIME) changes the last-access and + last-modification times of the file named PATH to ATIME and + MTIME, which are EMACS_TIMEs. + + EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the + result in DEST. SRC should not be negative. + + EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and + stores the result in DEST. SRC should not be negative. + EMACS_TIME_NEG_P (TIME) is true iff TIME is negative. + +*/ + +#ifdef HAVE_TIMEVAL + +#define EMACS_TIME struct timeval +#define EMACS_SECS(time) ((time).tv_sec + 0) +#define EMACS_USECS(time) ((time).tv_usec + 0) +#define EMACS_SET_SECS(time, seconds) ((time).tv_sec = (seconds)) +#define EMACS_SET_USECS(time, milliseconds) ((time).tv_usec = (milliseconds)) + +#define EMACS_GET_TIME(time) \ +{ \ + EMACS_TIME dummy; \ + gettimeofday (&(time), &dummy); \ +} + +#define EMACS_ADD_TIME(dest, src1, src2) \ +{ \ + (dest).tv_sec = (src1).tv_sec + (src2).tv_sec; \ + (dest).tv_usec = (src1).tv_usec + (src2).tv_usec; \ + if ((dest).tv_usec > 1000000) \ + (dest).tv_usec -= 1000000, (dest).tv_sec++; \ +} + +#define EMACS_SUB_TIME(dest, src1, src2) \ +{ \ + (dest).tv_sec = (src1).tv_sec - (src2).tv_sec; \ + (dest).tv_usec = (src1).tv_usec - (src2).tv_usec; \ + if ((dest).tv_usec < 0) \ + (dest).tv_usec += 1000000, (dest).tv_sec--; \ +} + +#define EMACS_TIME_NEG_P(time) \ + ((time).tv_sec < 0 \ + || ((time).tv_sec == 0 \ + && (time).tv_usec < 0)) + +#else /* not def HAVE_TIMEVAL */ + +#define EMACS_TIME int +#define EMACS_SECS(time) (time) +#define EMACS_SET_SECS(time, seconds) ((time) = (seconds)) + +#define EMACS_GET_TIME(t) ((t) = time ((long *) 0)) +#define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2)) +#define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2)) +#define EMACS_TIME_NEG_P(t) ((t) < 0) + +#endif /* def HAVE_TIMEVAL */ + +#define EMACS_SET_SECS_USECS(time, secs, usecs) \ + (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs)) + +#ifdef USE_UTIME + +#define EMACS_SET_UTIMES(path, atime, mtime) \ + { \ + struct time_t tv[2]; \ + tv[0] = EMACS_SECS (atime); \ + tv[1] = EMACS_SECS (mtime); \ + utime ((path), tv); \ + } + +#else + +#define EMACS_SET_UTIMES(path, atime, mtime) \ + { \ + EMACS_TIME tv[2]; \ + tv[0] = atime; \ + tv[1] = mtime; \ + utimes ((path), tv); \ + } + +#endif |