io/tst-getcwd-abspath.c

   1 /* BZ #22679 getcwd(3) should not succeed without returning an absolute path.
   2
   3    Copyright (C) 2018-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <support/check.h>
  24 #include <support/namespace.h>
  25 #include <support/support.h>
  26 #include <support/temp_file.h>
  27 #include <support/test-driver.h>
  28 #include <support/xunistd.h>
  29 #include <unistd.h>
  30
  31 static char *chroot_dir;
  32
  33 /* The actual test.  Run it in a subprocess, so that the test harness
  34    can remove the temporary directory in --direct mode.  */
  35 static void
  36 getcwd_callback (void *closure)
  37 {
  38   xchroot (chroot_dir);
  39
  40   errno = 0;
  41   char *cwd = getcwd (NULL, 0);
  42   TEST_COMPARE (errno, ENOENT);
  43   TEST_VERIFY (cwd == NULL);
  44
  45   errno = 0;
  46   cwd = realpath (".", NULL);
  47   TEST_COMPARE (errno, ENOENT);
  48   TEST_VERIFY (cwd == NULL);
  49
  50   _exit (0);
  51 }
  52
  53 static int
  54 do_test (void)
  55 {
  56   support_become_root ();
  57   if (!support_can_chroot ())
  58     return EXIT_UNSUPPORTED;
  59
  60   chroot_dir = support_create_temp_directory ("tst-getcwd-abspath-");
  61   support_isolate_in_subprocess (getcwd_callback, NULL);
  62
  63   return 0;
  64 }
  65
  66 #include <support/test-driver.c>