rt/clock_getcpuclockid.c

   1 /* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22
  23 int
  24 clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
  25 {
  26   /* We don't allow any process ID but our own.  */
  27   if (pid != 0 && pid != getpid ())
  28     return EPERM;
  29
  30 #ifdef CLOCK_PROCESS_CPUTIME_ID
  31   /* Store the number.  */
  32   *clock_id = CLOCK_PROCESS_CPUTIME_ID;
  33
  34   return 0;
  35 #else
  36   /* We don't have a timer for that.  */
  37   return ENOENT;
  38 #endif
  39 }