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>