misc/tst-ioctl.c

   1 /* Smoke test for ioctl.
   2    Copyright (C) 2021-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/check.h>
  20 #include <support/xunistd.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/socket.h>
  23
  24 static int
  25 do_test (void)
  26 {
  27   int pair[2];
  28   TEST_COMPARE (socketpair (AF_UNIX, SOCK_STREAM, 0, pair), 0);
  29   TEST_COMPARE (write (pair[0], "buffer", sizeof ("buffer")),
  30                 sizeof ("buffer"));
  31   int value;
  32   TEST_COMPARE (ioctl (pair[1], FIONREAD, &value), 0);
  33   TEST_COMPARE (value, sizeof ("buffer"));
  34   TEST_COMPARE (ioctl (pair[0], FIONREAD, &value), 0);
  35   TEST_COMPARE (value, 0);
  36   xclose (pair[0]);
  37   xclose (pair[1]);
  38   return 0;
  39 }
  40
  41 #include <support/test-driver.c>