Commit f469625a authored by Jim Blandy's avatar Jim Blandy
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Initial revision

parent b1c884c3
/* 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
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