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glibc  2.9
setitimer.c
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00001 /* Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stddef.h>
00020 #include <errno.h>
00021 #include <sys/time.h>
00022 #include <unistd.h>
00023 #include <signal.h>
00024 
00025 extern int __libc_nanosleep (const struct timespec *requested_time,
00026                           struct timespec *remaining);
00027 int
00028 __setitimer (which, new, old)
00029      enum __itimer_which which;
00030      const struct itimerval *new;
00031      struct itimerval *old;
00032 {
00033   if (new == NULL)
00034     {
00035       __set_errno (EINVAL);
00036       return -1;
00037     }
00038 
00039   switch (which)
00040    {
00041     default:
00042       __set_errno (EINVAL);
00043       return -1;
00044 
00045     case ITIMER_VIRTUAL:
00046     case ITIMER_PROF:
00047       __set_errno (ENOSYS);
00048       return -1;
00049 
00050     case ITIMER_REAL:
00051       break;
00052    }
00053 
00054   switch (__fork())
00055    {
00056     case -1: exit(-1);
00057     case  0:
00058        {
00059         struct timespec ts ={.tv_sec = (long int)new->it_value.tv_sec, .tv_nsec = 0};
00060         __libc_nanosleep(&ts,&ts);
00061        __kill(getppid(), SIGALRM);
00062        exit(0);
00063        }
00064     default:
00065    }
00066   return 0;
00067 }
00068 weak_alias (__setitimer, setitimer)