github.com/afumu/libc@v0.0.6/musl/src/signal/sigtimedwait.c (about)

     1  #include <signal.h>
     2  #include <errno.h>
     3  #include "syscall.h"
     4  
     5  #define IS32BIT(x) !((x)+0x80000000ULL>>32)
     6  #define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
     7  
     8  static int do_sigtimedwait(const sigset_t *restrict mask, siginfo_t *restrict si, const struct timespec *restrict ts)
     9  {
    10  #ifdef SYS_rt_sigtimedwait_time64
    11  	time_t s = ts ? ts->tv_sec : 0;
    12  	long ns = ts ? ts->tv_nsec : 0;
    13  	int r = -ENOSYS;
    14  	if (SYS_rt_sigtimedwait == SYS_rt_sigtimedwait_time64 || !IS32BIT(s))
    15  		r = __syscall_cp(SYS_rt_sigtimedwait_time64, mask, si,
    16  			ts ? ((long long[]){s, ns}) : 0, _NSIG/8);
    17  	if (SYS_rt_sigtimedwait == SYS_rt_sigtimedwait_time64 || r!=-ENOSYS)
    18  		return r;
    19  	return __syscall_cp(SYS_rt_sigtimedwait, mask, si,
    20  		ts ? ((long[]){CLAMP(s), ns}) : 0, _NSIG/8);;
    21  #else
    22  	return __syscall_cp(SYS_rt_sigtimedwait, mask, si, ts, _NSIG/8);
    23  #endif
    24  }
    25  
    26  int sigtimedwait(const sigset_t *restrict mask, siginfo_t *restrict si, const struct timespec *restrict timeout)
    27  {
    28  	int ret;
    29  	do ret = do_sigtimedwait(mask, si, timeout);
    30  	while (ret==-EINTR);
    31  	return __syscall_ret(ret);
    32  }