tests/test-sys_select.c

   1 /* Test of <sys/select.h> substitute.
   2    Copyright (C) 2007-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <sys/select.h>
  22
  23 #include "signature.h"
  24
  25 /* The following may be macros without underlying functions, so only
  26    check signature if they are not macros.  */
  27 #ifndef FD_CLR
  28 SIGNATURE_CHECK (FD_CLR, void, (int, fd_set *));
  29 #endif
  30 #ifndef FD_ISSET
  31 SIGNATURE_CHECK (FD_ISSET, void, (int, fd_set *));
  32 #endif
  33 #ifndef FD_SET
  34 SIGNATURE_CHECK (FD_SET, int, (int, fd_set *));
  35 #endif
  36 #ifndef FD_ZERO
  37 SIGNATURE_CHECK (FD_ZERO, void, (fd_set *));
  38 #endif
  39
  40 /* Check that the 'struct timeval' type is defined.  */
  41 struct timeval a;
  42
  43 /* Check that a.tv_sec is wide enough to hold a time_t, ignoring
  44    signedness issues.  */
  45 typedef int verify_tv_sec_type[sizeof (time_t) <= sizeof (a.tv_sec) ? 1 : -1];
  46
  47 /* Check that sigset_t is defined.  */
  48 sigset_t t2;
  49
  50 int
  51 main (void)
  52 {
  53   /* Check that FD_ZERO can be used.  This should not yield a warning
  54      such as "warning: implicit declaration of function 'memset'".  */
  55   fd_set fds;
  56   FD_ZERO (&fds);
  57
  58   return 0;
  59 }