external/gpl2/xcvs/dist/lib/timespec.h

   1 /* timespec -- System time interface
   2
   3    Copyright (C) 2000, 2002, 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #if ! defined TIMESPEC_H
  20 # define TIMESPEC_H
  21
  22 # include <sys/types.h>
  23 # if TIME_WITH_SYS_TIME
  24 #  include <sys/time.h>
  25 #  include <time.h>
  26 # else
  27 #  if HAVE_SYS_TIME_H
  28 #   include <sys/time.h>
  29 #  else
  30 #   include <time.h>
  31 #  endif
  32 # endif
  33
  34 # if ! HAVE_STRUCT_TIMESPEC
  35 /* Some systems don't define this struct, e.g., AIX 4.1, Ultrix 4.3.  */
  36 struct timespec
  37 {
  38   time_t tv_sec;
  39   long tv_nsec;
  40 };
  41 # endif
  42
  43 /* Return negative, zero, positive if A < B, A == B, A > B, respectively.
  44    Assume the nanosecond components are in range, or close to it.  */
  45 static inline int
  46 timespec_cmp (struct timespec a, struct timespec b)
  47 {
  48   return (a.tv_sec < b.tv_sec ? -1
  49           : a.tv_sec > b.tv_sec ? 1
  50           : a.tv_nsec - b.tv_nsec);
  51 }
  52
  53 # if ! HAVE_DECL_NANOSLEEP
  54 /* Don't specify a prototype here.  Some systems (e.g., OSF) declare
  55    nanosleep with a conflicting one (const-less first parameter).  */
  56 int nanosleep ();
  57 # endif
  58
  59 void gettime (struct timespec *);
  60 int settime (struct timespec const *);
  61
  62 #endif