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 #ifndef EMACS_SYSTIME_H
  22 #define EMACS_SYSTIME_H
  23
  24 #ifdef TIME_WITH_SYS_TIME
  25 #include <sys/time.h>
  26 #include <time.h>
  27 #else
  28 #ifdef HAVE_SYS_TIME_H
  29 #include <sys/time.h>
  30 #else
  31 #include <time.h>
  32 #endif
  33 #endif
  34
  35 #ifdef HAVE_TZNAME
  36 #ifndef tzname          /* For SGI.  */
  37 extern char *tzname[];  /* RS6000 and others want it this way.  */
  38 #endif
  39 #endif
  40
  41 /* SVr4 doesn't actually declare this in its #include files.  */
  42 #ifdef USG5_4
  43 extern time_t timezone;
  44 #endif
  45
  46 #ifdef VMS
  47 #ifdef VAXC
  48 #include "vmstime.h"
  49 #endif
  50 #endif
  51
  52 /* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
  53    disagree about the name of the guard symbol.  */
  54 #ifdef HPUX
  55 #ifdef _STRUCT_TIMEVAL
  56 #ifndef __TIMEVAL__
  57 #define __TIMEVAL__
  58 #endif
  59 #endif
  60 #endif
  61 \f
  62 /* EMACS_TIME is the type to use to represent temporal intervals -
  63    struct timeval on some systems, int on others.  It can be passed as
  64    the timeout argument to the select  system call.
  65
  66    EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
  67    EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
  68
  69    EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component.
  70    EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
  71         This returns zero if EMACS_TIME doesn't have a microseconds component.
  72    EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
  73         This does nothing if EMACS_TIME doesn't have a microseconds component.
  74
  75    EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
  76
  77    EMACS_GET_TIME (TIME) stores the current system time in TIME, which
  78         should be an lvalue.
  79
  80    EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
  81         result in DEST.  SRC should not be negative.
  82
  83    EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
  84         stores the result in DEST.  SRC should not be negative.
  85    EMACS_TIME_NEG_P (TIME) is true iff TIME is negative.
  86
  87 */
  88
  89 #ifdef HAVE_TIMEVAL
  90
  91 #define EMACS_HAS_USECS
  92
  93 #define EMACS_TIME struct timeval
  94 #define EMACS_SECS(time)                    ((time).tv_sec  + 0)
  95 #define EMACS_USECS(time)                   ((time).tv_usec + 0)
  96 #define EMACS_SET_SECS(time, seconds)       ((time).tv_sec  = (seconds))
  97 #define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
  98
  99 /* On SVR4, the compiler may complain if given this extra BSD arg.  */
 100 #ifdef GETTIMEOFDAY_ONE_ARGUMENT
 101 #define EMACS_GET_TIME(time) gettimeofday (&(time))
 102 #else /* not GETTIMEOFDAY_ONE_ARGUMENT */
 103 #ifdef HAVE_STRUCT_TIMEZONE
 104 #define EMACS_GET_TIME(time)                    \
 105   do {                                          \
 106     struct timezone dummy;                      \
 107     gettimeofday (&(time), &dummy);             \
 108   } while (0)
 109 #else
 110 /* Presumably the second arg is ignored.  */
 111 #define EMACS_GET_TIME(time) gettimeofday (&(time), NULL)
 112 #endif /* HAVE_STRUCT_TIMEZONE */
 113 #endif /* not GETTIMEOFDAY_ONE_ARGUMENT */
 114
 115 #define EMACS_ADD_TIME(dest, src1, src2)                \
 116   do {                                                  \
 117     (dest).tv_sec  = (src1).tv_sec  + (src2).tv_sec;    \
 118     (dest).tv_usec = (src1).tv_usec + (src2).tv_usec;   \
 119     if ((dest).tv_usec > 1000000)                       \
 120       (dest).tv_usec -= 1000000, (dest).tv_sec++;       \
 121   } while (0)
 122
 123 #define EMACS_SUB_TIME(dest, src1, src2)                \
 124   do {                                                  \
 125     (dest).tv_sec  = (src1).tv_sec  - (src2).tv_sec;    \
 126     (dest).tv_usec = (src1).tv_usec - (src2).tv_usec;   \
 127     if ((dest).tv_usec < 0)                             \
 128       (dest).tv_usec += 1000000, (dest).tv_sec--;       \
 129   } while (0)
 130
 131 #define EMACS_TIME_NEG_P(time)                                  \
 132   ((long)(time).tv_sec < 0                                      \
 133    || ((time).tv_sec == 0                                       \
 134        && (long)(time).tv_usec < 0))
 135
 136 #else /* ! defined (HAVE_TIMEVAL) */
 137
 138 #define EMACS_TIME int
 139 #define EMACS_SECS(time)                    (time)
 140 #define EMACS_USECS(time)                   0
 141 #define EMACS_SET_SECS(time, seconds)       ((time) = (seconds))
 142 #define EMACS_SET_USECS(time, usecs)        0
 143
 144 #define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
 145 #define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
 146 #define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
 147 #define EMACS_TIME_NEG_P(t) ((t) < 0)
 148
 149 #endif /* ! defined (HAVE_TIMEVAL) */
 150
 151 #define EMACS_SET_SECS_USECS(time, secs, usecs)                 \
 152   (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
 153
 154 extern int set_file_times __P ((char *, EMACS_TIME, EMACS_TIME));
 155
 156 /* Compare times T1 and T2.  Value is 0 if T1 and T2 are the same.
 157    Value is < 0 if T1 is less than T2.  Value is > 0 otherwise.  */
 158
 159 #define EMACS_TIME_CMP(T1, T2)                  \
 160   (EMACS_SECS (T1) - EMACS_SECS (T2)            \
 161    + (EMACS_SECS (T1) == EMACS_SECS (T2)        \
 162       ? EMACS_USECS (T1) - EMACS_USECS (T2)     \
 163       : 0))
 164
 165 /* Compare times T1 and T2 for equality, inequality etc.  */
 166
 167 #define EMACS_TIME_EQ(T1, T2) (EMACS_TIME_CMP (T1, T2) == 0)
 168 #define EMACS_TIME_NE(T1, T2) (EMACS_TIME_CMP (T1, T2) != 0)
 169 #define EMACS_TIME_GT(T1, T2) (EMACS_TIME_CMP (T1, T2) > 0)
 170 #define EMACS_TIME_GE(T1, T2) (EMACS_TIME_CMP (T1, T2) >= 0)
 171 #define EMACS_TIME_LT(T1, T2) (EMACS_TIME_CMP (T1, T2) < 0)
 172 #define EMACS_TIME_LE(T1, T2) (EMACS_TIME_CMP (T1, T2) <= 0)
 173
 174 #endif /* EMACS_SYSTIME_H */