src/systime.h

   1 /* systime.h - System-dependent definitions for time manipulations.
   2    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   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 2, or (at your option)
   9 any later version.
  10
  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.
  15
  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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifdef TIME_WITH_SYS_TIME
  22 #include <sys/time.h>
  23 #include <time.h>
  24 #else
  25 #ifdef HAVE_SYS_TIME_H
  26 #include <sys/time.h>
  27 #else
  28 #include <time.h>
  29 #endif
  30 #endif
  31
  32 #ifdef HAVE_TZNAME
  33 #ifndef tzname          /* For SGI.  */
  34 extern char *tzname[];  /* RS6000 and others want it this way.  */
  35 #endif
  36 #endif
  37
  38 /* SVr4 doesn't actually declare this in its #include files.  */
  39 #ifdef USG5_4
  40 extern long timezone;
  41 #endif
  42
  43 #ifdef VMS
  44 #ifdef VAXC
  45 #include "vmstime.h"
  46 #endif
  47 #endif
  48
  49 /* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
  50    disagree about the name of the guard symbol.  */
  51 #ifdef HPUX
  52 #ifdef _STRUCT_TIMEVAL
  53 #ifndef __TIMEVAL__
  54 #define __TIMEVAL__
  55 #endif
  56 #endif
  57 #endif
  58 \f
  59 /* EMACS_TIME is the type to use to represent temporal intervals -
  60    struct timeval on some systems, int on others.  It can be passed as
  61    the timeout argument to the select  system call.
  62
  63    EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
  64    EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
  65
  66    EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component.
  67    EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
  68         This returns zero if EMACS_TIME doesn't have a microseconds component.
  69    EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
  70         This does nothing if EMACS_TIME doesn't have a microseconds component.
  71
  72    EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
  73
  74    EMACS_GET_TIME (TIME) stores the current system time in TIME, which
  75         should be an lvalue.
  76
  77    EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
  78         result in DEST.  SRC should not be negative.
  79
  80    EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
  81         stores the result in DEST.  SRC should not be negative.
  82    EMACS_TIME_NEG_P (TIME) is true iff TIME is negative.
  83
  84 */
  85
  86 #ifdef HAVE_TIMEVAL
  87
  88 #define EMACS_HAS_USECS
  89
  90 #define EMACS_TIME struct timeval
  91 #define EMACS_SECS(time)                    ((time).tv_sec  + 0)
  92 #define EMACS_USECS(time)                   ((time).tv_usec + 0)
  93 #define EMACS_SET_SECS(time, seconds)       ((time).tv_sec  = (seconds))
  94 #define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
  95
  96 /* On SVR4, the compiler may complain if given this extra BSD arg.  */
  97 #ifdef GETTIMEOFDAY_ONE_ARGUMENT
  98 #define EMACS_GET_TIME(time)                                  \
  99 {                                                             \
 100   gettimeofday (&(time));                                     \
 101 }
 102 #else /* not GETTIMEOFDAY_ONE_ARGUMENT */
 103 #define EMACS_GET_TIME(time)                                    \
 104 {                                                               \
 105   struct timezone dummy;                                        \
 106   gettimeofday (&(time), &dummy);                               \
 107 }
 108 #endif /* not GETTIMEOFDAY_ONE_ARGUMENT */
 109
 110 #define EMACS_ADD_TIME(dest, src1, src2)                        \
 111 {                                                               \
 112   (dest).tv_sec  = (src1).tv_sec  + (src2).tv_sec;              \
 113   (dest).tv_usec = (src1).tv_usec + (src2).tv_usec;             \
 114   if ((dest).tv_usec > 1000000)                                 \
 115     (dest).tv_usec -= 1000000, (dest).tv_sec++;                 \
 116 }
 117
 118 #define EMACS_SUB_TIME(dest, src1, src2)                        \
 119 {                                                               \
 120   (dest).tv_sec  = (src1).tv_sec  - (src2).tv_sec;              \
 121   (dest).tv_usec = (src1).tv_usec - (src2).tv_usec;             \
 122   if ((dest).tv_usec < 0)                                       \
 123     (dest).tv_usec += 1000000, (dest).tv_sec--;                 \
 124 }
 125
 126 #define EMACS_TIME_NEG_P(time)                                  \
 127   ((long)(time).tv_sec < 0                                      \
 128    || ((time).tv_sec == 0                                       \
 129        && (long)(time).tv_usec < 0))
 130
 131 #else /* ! defined (HAVE_TIMEVAL) */
 132
 133 #define EMACS_TIME int
 134 #define EMACS_SECS(time)                    (time)
 135 #define EMACS_USECS(time)                   0
 136 #define EMACS_SET_SECS(time, seconds)       ((time) = (seconds))
 137 #define EMACS_SET_USECS(time, usecs)        0
 138
 139 #define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
 140 #define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
 141 #define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
 142 #define EMACS_TIME_NEG_P(t) ((t) < 0)
 143
 144 #endif /* ! defined (HAVE_TIMEVAL) */
 145
 146 #define EMACS_SET_SECS_USECS(time, secs, usecs)                 \
 147   (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
 148
 149 extern int set_file_times ();