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

     1  #include <time.h>
     2  #include <limits.h>
     3  #include "pthread_impl.h"
     4  
     5  int timer_gettime(timer_t t, struct itimerspec *val)
     6  {
     7  	if ((intptr_t)t < 0) {
     8  		pthread_t td = (void *)((uintptr_t)t << 1);
     9  		t = (void *)(uintptr_t)(td->timer_id & INT_MAX);
    10  	}
    11  #ifdef SYS_timer_gettime64
    12  	int r = -ENOSYS;
    13  	if (sizeof(time_t) > 4)
    14  		r = __syscall(SYS_timer_gettime64, t, val);
    15  	if (SYS_timer_gettime == SYS_timer_gettime64 || r!=-ENOSYS)
    16  		return __syscall_ret(r);
    17  	long val32[4];
    18  	r = __syscall(SYS_timer_gettime, t, val32);
    19  	if (!r) {
    20  		val->it_interval.tv_sec = val32[0];
    21  		val->it_interval.tv_nsec = val32[1];
    22  		val->it_value.tv_sec = val32[2];
    23  		val->it_value.tv_nsec = val32[3];
    24  	}
    25  	return __syscall_ret(r);
    26  #endif
    27  	return syscall(SYS_timer_gettime, t, val);
    28  }