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code.delx.au - gnu-emacs/blob - src/systime.h
1 /* systime.h - System-dependent definitions for time manipulations.
2 Copyright (C) 1993, 1994 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #ifdef TIME_WITH_SYS_TIME
24 #ifdef HAVE_SYS_TIME_H
32 #ifndef tzname /* For SGI. */
33 extern char *tzname
[]; /* RS6000 and others want it this way. */
37 /* SVr4 doesn't actually declare this in its #include files. */
48 /* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
49 disagree about the name of the guard symbol. */
51 #ifdef _STRUCT_TIMEVAL
58 /* EMACS_TIME is the type to use to represent temporal intervals -
59 struct timeval on some systems, int on others. It can be passed as
60 the timeout argument to the select system call.
62 EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
63 EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
65 EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component.
66 EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
67 This returns zero if EMACS_TIME doesn't have a microseconds component.
68 EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
69 This does nothing if EMACS_TIME doesn't have a microseconds component.
71 EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
73 EMACS_GET_TIME (TIME) stores the current system time in TIME, which
75 EMACS_SET_UTIMES (PATH, ATIME, MTIME) changes the last-access and
76 last-modification times of the file named PATH to ATIME and
77 MTIME, which are EMACS_TIMEs.
79 EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
80 result in DEST. SRC should not be negative.
82 EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
83 stores the result in DEST. SRC should not be negative.
84 EMACS_TIME_NEG_P (TIME) is true iff TIME is negative.
90 #define EMACS_HAS_USECS
92 #define EMACS_TIME struct timeval
93 #define EMACS_SECS(time) ((time).tv_sec + 0)
94 #define EMACS_USECS(time) ((time).tv_usec + 0)
95 #define EMACS_SET_SECS(time, seconds) ((time).tv_sec = (seconds))
96 #define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
98 /* On SVR4, the compiler may complain if given this extra BSD arg. */
100 #define EMACS_GET_TIME(time) \
102 gettimeofday (&(time)); \
104 #else /* not USG5_4 */
105 #define EMACS_GET_TIME(time) \
107 struct timezone dummy; \
108 gettimeofday (&(time), &dummy); \
110 #endif /* not USG5_4 */
112 #define EMACS_ADD_TIME(dest, src1, src2) \
114 (dest).tv_sec = (src1).tv_sec + (src2).tv_sec; \
115 (dest).tv_usec = (src1).tv_usec + (src2).tv_usec; \
116 if ((dest).tv_usec > 1000000) \
117 (dest).tv_usec -= 1000000, (dest).tv_sec++; \
120 #define EMACS_SUB_TIME(dest, src1, src2) \
122 (dest).tv_sec = (src1).tv_sec - (src2).tv_sec; \
123 (dest).tv_usec = (src1).tv_usec - (src2).tv_usec; \
124 if ((dest).tv_usec < 0) \
125 (dest).tv_usec += 1000000, (dest).tv_sec--; \
128 #define EMACS_TIME_NEG_P(time) \
129 ((long)(time).tv_sec < 0 \
130 || ((time).tv_sec == 0 \
131 && (long)(time).tv_usec < 0))
133 #else /* ! defined (HAVE_TIMEVAL) */
135 #define EMACS_TIME int
136 #define EMACS_SECS(time) (time)
137 #define EMACS_USECS(time) 0
138 #define EMACS_SET_SECS(time, seconds) ((time) = (seconds))
139 #define EMACS_SET_USECS(time, usecs) 0
141 #define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
142 #define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
143 #define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
144 #define EMACS_TIME_NEG_P(t) ((t) < 0)
146 #endif /* ! defined (HAVE_TIMEVAL) */
148 #define EMACS_SET_SECS_USECS(time, secs, usecs) \
149 (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
153 #define EMACS_SET_UTIMES(path, atime, mtime) \
156 tv[0] = EMACS_SECS (atime); \
157 tv[1] = EMACS_SECS (mtime); \
158 utime ((path), tv); \
161 #else /* ! defined (USE_UTIME) */
163 #define EMACS_SET_UTIMES(path, atime, mtime) \
168 utimes ((path), tv); \
171 #endif /* ! defined (USE_UTIME) */