lib/libc/sys-minix/setitimer.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <sys/time.h>
   6
   7 /*
   8  * This is the implementation of the function to
   9  * invoke the interval timer setting system call.
  10  */
  11 int setitimer(int which, const struct itimerval *__restrict value,
  12                 struct itimerval *__restrict ovalue)
  13 {
  14   message m;
  15
  16   /* A null pointer for 'value' would make setitimer behave like getitimer,
  17    * which is not according to the specification, so disallow null pointers.
  18    */
  19   if (value == NULL) return(EINVAL);
  20
  21   m.m1_i1 = which;
  22   m.m1_p1 = (char *) __UNCONST(value);
  23   m.m1_p2 = (char *) ovalue;
  24
  25   return _syscall(PM_PROC_NR, ITIMER, &m);
  26 }