libc/sysdeps/linux/common/alarm.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * alarm() for uClibc
   4  *
   5  * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * GNU Library General Public License (LGPL) version 2 or later.
   8  */
   9
  10 #include "syscalls.h"
  11 #include <unistd.h>
  12 #ifdef __NR_alarm
  13 #define __NR___alarm __NR_alarm
  14 _syscall1(unsigned int, alarm, unsigned int, seconds);
  15 #else
  16 #include <sys/time.h>
  17
  18 libc_hidden_proto(setitimer)
  19
  20 unsigned int alarm(unsigned int seconds)
  21 {
  22         struct itimerval old, new;
  23         unsigned int retval;
  24
  25         new.it_value.tv_usec = 0;
  26         new.it_interval.tv_sec = 0;
  27         new.it_interval.tv_usec = 0;
  28         new.it_value.tv_sec = (long int) seconds;
  29         if (setitimer(ITIMER_REAL, &new, &old) < 0) {
  30                 return 0;
  31         }
  32         retval = old.it_value.tv_sec;
  33         if (old.it_value.tv_usec) {
  34                 ++retval;
  35         }
  36         return retval;
  37 }
  38 #endif
  39 libc_hidden_proto(alarm)
  40 libc_hidden_def(alarm)