lib/timespec.h

   1 /* timespec -- System time interface
   2
   3    Copyright (C) 2000, 2002, 2004 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #if ! defined TIMESPEC_H
  20 # define TIMESPEC_H
  21
  22 /* You must include config.h before including this file.  */
  23
  24 # include <sys/types.h>
  25 # if TIME_WITH_SYS_TIME
  26 #  include <sys/time.h>
  27 #  include <time.h>
  28 # else
  29 #  if HAVE_SYS_TIME_H
  30 #   include <sys/time.h>
  31 #  else
  32 #   include <time.h>
  33 #  endif
  34 # endif
  35
  36 # if ! HAVE_STRUCT_TIMESPEC
  37 /* Some systems don't define this struct, e.g., AIX 4.1, Ultrix 4.3.  */
  38 struct timespec
  39 {
  40   time_t tv_sec;
  41   long tv_nsec;
  42 };
  43 # endif
  44
  45 # ifdef ST_MTIM_NSEC
  46 #  define ST_TIME_CMP_NS(a, b, ns) ((a).ns < (b).ns ? -1 : (a).ns > (b).ns)
  47 # else
  48 #  define ST_TIME_CMP_NS(a, b, ns) 0
  49 # endif
  50 # define ST_TIME_CMP(a, b, s, ns) \
  51    ((a).s < (b).s ? -1 : (a).s > (b).s ? 1 : ST_TIME_CMP_NS(a, b, ns))
  52 # define ATIME_CMP(a, b) ST_TIME_CMP (a, b, st_atime, st_atim.ST_MTIM_NSEC)
  53 # define CTIME_CMP(a, b) ST_TIME_CMP (a, b, st_ctime, st_ctim.ST_MTIM_NSEC)
  54 # define MTIME_CMP(a, b) ST_TIME_CMP (a, b, st_mtime, st_mtim.ST_MTIM_NSEC)
  55
  56 # ifdef ST_MTIM_NSEC
  57 #  define TIMESPEC_NS(timespec) ((timespec).ST_MTIM_NSEC)
  58 # else
  59 #  define TIMESPEC_NS(timespec) 0
  60 # endif
  61
  62 # if ! HAVE_DECL_NANOSLEEP
  63 /* Don't specify a prototype here.  Some systems (e.g., OSF) declare
  64    nanosleep with a conflicting one (const-less first parameter).  */
  65 int nanosleep ();
  66 # endif
  67
  68 int gettime (struct timespec *);
  69 int settime (struct timespec const *);
  70
  71 #endif