github.com/afumu/libc@v0.0.6/musl/src/time/timer_settime.c (about)

     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  }