github.com/afumu/libc@v0.0.6/musl/src/linux/ppoll.c (about)

     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  }