src/signal/sigtimedwait.c

   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 }