1  /* Regression test for bug 11319.
       2     Copyright (C) 2018-2023 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  #define _GNU_SOURCE 1
      20  
      21  #include <fcntl.h>
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  
      25  #include <support/check.h>
      26  #include <support/temp_file.h>
      27  #include <support/xunistd.h>
      28  
      29  static int
      30  do_test (void)
      31  {
      32    char *tempfile;
      33    int fd;
      34  
      35    /* Create a temporary file and open it in read-only mode.  */
      36    TEST_VERIFY_EXIT (create_temp_file ("tst-bz11319", &tempfile));
      37    fd = xopen (tempfile, O_RDONLY, 0660);
      38  
      39    /* Try and write to the temporary file to intentionally fail, then
      40       check that dprintf (or __dprintf_chk) return EOF.  */
      41    TEST_COMPARE (dprintf (fd, "%d", 0), EOF);
      42  
      43    xclose (fd);
      44    free (tempfile);
      45  
      46    return 0;
      47  }
      48  
      49  #include <support/test-driver.c>