sigtimedwait.c raw

   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  }
  33