libc-bottom-half/cloudlibc/src/libc/sys/select/select.c

   1 // Copyright (c) 2015 Nuxi, https://nuxi.nl/
   2 //
   3 // SPDX-License-Identifier: BSD-2-Clause
   4
   5 #include <sys/select.h>
   6
   7 #include <errno.h>
   8 #include <stddef.h>
   9
  10 int select(int nfds, fd_set *restrict readfds, fd_set *restrict writefds,
  11            fd_set *restrict errorfds, struct timeval *restrict timeout) {
  12   if (timeout != NULL) {
  13     // Timeout specified.
  14     if (timeout->tv_usec < 0 || timeout->tv_usec >= 1000000) {
  15       errno = EINVAL;
  16       return -1;
  17     }
  18     struct timespec ts = {.tv_sec = timeout->tv_sec,
  19                           .tv_nsec = (long)timeout->tv_usec * 1000};
  20 #ifdef __wasilibc_unmodified_upstream
  21     return pselect(nfds, readfds, writefds, errorfds, &ts);
  22 #else
  23     return pselect(nfds, readfds, writefds, errorfds, &ts, NULL);
  24 #endif
  25   } else {
  26     // No timeout specified.
  27 #ifdef __wasilibc_unmodified_upstream
  28     return pselect(nfds, readfds, writefds, errorfds, NULL);
  29 #else
  30     return pselect(nfds, readfds, writefds, errorfds, NULL, NULL);
  31 #endif
  32   }
  33 }