ppoll.c raw

   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  }
  27