sysdeps/unix/sysv/linux/bits/time.h

   1 /* System-dependent timing definitions.  Linux version.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /*
  21  * Never include this file directly; use <time.h> instead.
  22  */
  23
  24 #ifdef __need_timeval
  25 # undef __need_timeval
  26 # ifndef _STRUCT_TIMEVAL
  27 #  define _STRUCT_TIMEVAL       1
  28 /* A time value that is accurate to the nearest
  29    microsecond but also has a range of years.  */
  30 struct timeval
  31   {
  32     time_t tv_sec;              /* Seconds.  */
  33     time_t tv_usec;             /* Microseconds.  */
  34   };
  35 # endif /* struct timeval */
  36 #endif  /* need timeval */
  37
  38
  39 #ifndef _BITS_TIME_H
  40 #define _BITS_TIME_H    1
  41
  42 /* ISO/IEC 9899:1990 7.12.1: <time.h>
  43    The macro `CLOCKS_PER_SEC' is the number per second of the value
  44    returned by the `clock' function. */
  45 /* CAE XSH, Issue 4, Version 2: <time.h>
  46    The value of CLOCKS_PER_SEC is required to be 1 million on all
  47    XSI-conformant systems. */
  48 # define CLOCKS_PER_SEC  1000000
  49
  50 # ifndef __STRICT_ANSI__
  51 /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
  52    presents the real value for clock ticks per second for the system.  */
  53 #  define CLK_TCK 100
  54 # endif
  55
  56 #endif  /* bits/time.h */