1  /* test ftw bz26353: Check whether stack overflow occurs when the value
       2     of the nopenfd parameter is too large.
       3  
       4     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       5     This file is part of the GNU C Library.
       6  
       7     The GNU C Library is free software; you can redistribute it and/or
       8     modify it under the terms of the GNU Lesser General Public
       9     License as published by the Free Software Foundation; either
      10     version 2.1 of the License, or (at your option) any later version.
      11  
      12     The GNU C Library is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15     Lesser General Public License for more details.
      16  
      17     You should have received a copy of the GNU Lesser General Public
      18     License along with the GNU C Library; if not, see
      19     <https://www.gnu.org/licenses/>.  */
      20  
      21  #include <stdlib.h>
      22  #include <stdio.h>
      23  #include <ftw.h>
      24  #include <errno.h>
      25  #include <sys/resource.h>
      26  
      27  #include <support/temp_file.h>
      28  #include <support/capture_subprocess.h>
      29  #include <support/check.h>
      30  
      31  static int
      32  my_func (const char *file, const struct stat *sb, int flag)
      33  {
      34    return 0;
      35  }
      36  
      37  static int
      38  get_large_nopenfd (void)
      39  {
      40    struct rlimit r;
      41    TEST_COMPARE (getrlimit (RLIMIT_STACK, &r), 0);
      42    if (r.rlim_cur == RLIM_INFINITY)
      43      {
      44        r.rlim_cur = 8 * 1024 * 1024;
      45        TEST_COMPARE (setrlimit (RLIMIT_STACK, &r), 0);
      46      }
      47    return (int) r.rlim_cur;
      48  }
      49  
      50  static void
      51  do_ftw (void *unused)
      52  {
      53    char *tempdir = support_create_temp_directory ("tst-bz26353");
      54    int large_nopenfd = get_large_nopenfd ();
      55    TEST_COMPARE (ftw (tempdir, my_func, large_nopenfd), 0);
      56    free (tempdir);
      57  }
      58  
      59  /* Check whether stack overflow occurs.  */
      60  static int
      61  do_test (void)
      62  {
      63    struct support_capture_subprocess result;
      64    result = support_capture_subprocess (do_ftw, NULL);
      65    support_capture_subprocess_check (&result, "bz26353", 0, sc_allow_none);
      66    support_capture_subprocess_free (&result);
      67    return 0;
      68  }
      69  
      70  #include <support/test-driver.c>