src/linux/ppoll.c

   1 #define _GNU_SOURCE
   2 #include <poll.h>
   3 #include <signal.h>
   4 #include <errno.h>
   5 #include "syscall.h"
   6
   7 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   8 #define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
   9
  10 int ppoll(struct pollfd *fds, nfds_t n, const struct timespec *to, const sigset_t *mask)
  11 {
  12         time_t s = to ? to->tv_sec : 0;
  13         long ns = to ? to->tv_nsec : 0;
  14 #ifdef SYS_ppoll_time64
  15         int r = -ENOSYS;
  16         if (SYS_ppoll == SYS_ppoll_time64 || !IS32BIT(s))
  17                 r = __syscall_cp(SYS_ppoll_time64, fds, n,
  18                         to ? ((long long[]){s, ns}) : 0,
  19                         mask, _NSIG/8);
  20         if (SYS_ppoll == SYS_ppoll_time64 || r != -ENOSYS)
  21                 return __syscall_ret(r);
  22         s = CLAMP(s);
  23 #endif
  24         return syscall_cp(SYS_ppoll, fds, n,
  25                 to ? ((long[]){s, ns}) : 0, mask, _NSIG/8);
  26 }