misc/select.c

   1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <errno.h>
  21
  22 /* Check the first NFDS descriptors each in READFDS (if not NULL) for read
  23    readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
  24    (if not NULL) for exceptional conditions.  If TIMEOUT is not NULL, time out
  25    after waiting the interval specified therein.  Returns the number of ready
  26    descriptors, or -1 for errors.  */
  27 int
  28 __select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
  29           struct timeval *timeout)
  30 {
  31   __set_errno (ENOSYS);
  32   return -1;
  33 }
  34 libc_hidden_def (__select)
  35 stub_warning (select)
  36
  37 weak_alias (__select, select)