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

   1 /*
   2  * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Distributed under the terms of the MIT 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 useconds_t
  16 ualarm(useconds_t usec, useconds_t interval)
  17 {
  18         struct itimerval value, oldValue;
  19
  20         value.it_value.tv_sec = usec / 1000000;
  21         value.it_value.tv_usec = usec % 1000000;
  22         value.it_interval.tv_sec = interval / 1000000;
  23         value.it_interval.tv_usec = interval % 1000000;
  24
  25         if (setitimer(ITIMER_REAL, &value, &oldValue) < 0)
  26                 return -1;
  27
  28         return (oldValue.it_value.tv_sec * 1000000) + oldValue.it_value.tv_usec;
  29 }