src/system/libroot/posix/unistd/alarm.c

   1 /*
   2 ** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3 ** Distributed under the terms of the Haiku License.
   4 */
   5
   6
   7 #include <errno.h>
   8 #include <unistd.h>
   9 #include <sys/time.h>
  10
  11 #include <errno_private.h>
  12 #include <syscalls.h>
  13
  14
  15 uint
  16 alarm(unsigned int sec)
  17 {
  18         struct itimerval value, oldValue;
  19
  20         value.it_interval.tv_sec = value.it_interval.tv_usec = 0;
  21         value.it_value.tv_sec = sec;
  22         value.it_value.tv_usec = 0;
  23         if (setitimer(ITIMER_REAL, &value, &oldValue) < 0)
  24                 return -1;
  25
  26         if (oldValue.it_value.tv_usec)
  27                 oldValue.it_value.tv_sec++;
  28
  29         return oldValue.it_value.tv_sec;
  30 }
  31