sysdeps/unix/sysv/aix/setitimer.c

   1 /* Copyright (C) 1991, 1994, 1995, 1996, 1997 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 <stddef.h>
  20 #include <errno.h>
  21 #include <sys/time.h>
  22 #include <unistd.h>
  23 #include <signal.h>
  24
  25 extern int __libc_nanosleep (const struct timespec *requested_time,
  26                              struct timespec *remaining);
  27 int
  28 __setitimer (which, new, old)
  29      enum __itimer_which which;
  30      const struct itimerval *new;
  31      struct itimerval *old;
  32 {
  33   if (new == NULL)
  34     {
  35       __set_errno (EINVAL);
  36       return -1;
  37     }
  38
  39   switch (which)
  40    {
  41     default:
  42       __set_errno (EINVAL);
  43       return -1;
  44
  45     case ITIMER_VIRTUAL:
  46     case ITIMER_PROF:
  47       __set_errno (ENOSYS);
  48       return -1;
  49
  50     case ITIMER_REAL:
  51       break;
  52    }
  53
  54   switch (__fork())
  55    {
  56     case -1: exit(-1);
  57     case  0:
  58        {
  59         struct timespec ts ={.tv_sec = (long int)new->it_value.tv_sec, .tv_nsec = 0};
  60         __libc_nanosleep(&ts,&ts);
  61         __kill(getppid(), SIGALRM);
  62         exit(0);
  63        }
  64     default:
  65    }
  66   return 0;
  67 }
  68 weak_alias (__setitimer, setitimer)