minix/lib/libc/sys/setitimer.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <string.h>
   6 #include <sys/time.h>
   7
   8 /*
   9  * This is the implementation of the function to
  10  * invoke the interval timer setting system call.
  11  */
  12 int setitimer(int which, const struct itimerval *__restrict value,
  13                 struct itimerval *__restrict ovalue)
  14 {
  15   message m;
  16
  17   /* A null pointer for 'value' would make setitimer behave like getitimer,
  18    * which is not according to the specification, so disallow null pointers.
  19    */
  20   if (value == NULL) {
  21         errno = EINVAL;
  22         return -1;
  23   }
  24
  25   memset(&m, 0, sizeof(m));
  26   m.m_lc_pm_itimer.which = which;
  27   m.m_lc_pm_itimer.value = (vir_bytes)value;
  28   m.m_lc_pm_itimer.ovalue = (vir_bytes)ovalue;
  29
  30   return _syscall(PM_PROC_NR, PM_ITIMER, &m);
  31 }
  32
  33 #if defined(__minix) && defined(__weak_alias)
  34 __weak_alias(setitimer, __setitimer50)
  35 #endif