nsz Git - musl/blob - src/signal/setitimer.c

   1 #include <sys/time.h>
   2 #include <errno.h>
   3 #include "syscall.h"
   4
   5 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   6
   7 int setitimer(int which, const struct itimerval *restrict new, struct itimerval *restrict old)
   8 {
   9         if (sizeof(time_t) > sizeof(long)) {
  10                 time_t is = new->it_interval.tv_sec, vs = new->it_value.tv_sec;
  11                 long ius = new->it_interval.tv_usec, vus = new->it_value.tv_usec;
  12                 if (!IS32BIT(is) || !IS32BIT(vs))
  13                         return __syscall_ret(-ENOTSUP);
  14                 long old32[4];
  15                 int r = __syscall(SYS_setitimer, which,
  16                         ((long[]){is, ius, vs, vus}), old32);
  17                 if (!r && old) {
  18                         old->it_interval.tv_sec = old32[0];
  19                         old->it_interval.tv_usec = old32[1];
  20                         old->it_value.tv_sec = old32[2];
  21                         old->it_value.tv_usec = old32[3];
  22                 }
  23                 return __syscall_ret(r);
  24         }
  25         return syscall(SYS_setitimer, which, new, old);
  26 }