timer_settime.c raw

   1  #include <time.h>
   2  #include <limits.h>
   3  #include "pthread_impl.h"
   4  
   5  #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   6  
   7  int timer_settime(timer_t t, int flags, const struct itimerspec *restrict val, struct itimerspec *restrict old)
   8  {
   9  	if ((intptr_t)t < 0) {
  10  		pthread_t td = (void *)((uintptr_t)t << 1);
  11  		t = (void *)(uintptr_t)(td->timer_id & INT_MAX);
  12  	}
  13  #ifdef SYS_timer_settime64
  14  	time_t is = val->it_interval.tv_sec, vs = val->it_value.tv_sec;
  15  	long ins = val->it_interval.tv_nsec, vns = val->it_value.tv_nsec;
  16  	int r = -ENOSYS;
  17  	if (SYS_timer_settime == SYS_timer_settime64
  18  	    || !IS32BIT(is) || !IS32BIT(vs) || (sizeof(time_t)>4 && old))
  19  		r = __syscall(SYS_timer_settime64, t, flags,
  20  			((long long[]){is, ins, vs, vns}), old);
  21  	if (SYS_timer_settime == SYS_timer_settime64 || r!=-ENOSYS)
  22  		return __syscall_ret(r);
  23  	if (!IS32BIT(is) || !IS32BIT(vs))
  24  		return __syscall_ret(-ENOTSUP);
  25  	long old32[4];
  26  	r = __syscall(SYS_timer_settime, t, flags,
  27  		((long[]){is, ins, vs, vns}), old32);
  28  	if (!r && old) {
  29  		old->it_interval.tv_sec = old32[0];
  30  		old->it_interval.tv_nsec = old32[1];
  31  		old->it_value.tv_sec = old32[2];
  32  		old->it_value.tv_nsec = old32[3];
  33  	}
  34  	return __syscall_ret(r);
  35  #endif
  36  	return syscall(SYS_timer_settime, t, flags, val, old);
  37  }
  38