1  /* Tests of unlink.
       2     Copyright (C) 2009-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Eric Blake <ebb9@byu.net>, 2009.  */
      18  
      19  /* This file is designed to test both unlink(n) and
      20     unlinkat(AT_FDCWD,n,0).  FUNC is the function to test.  Assumes
      21     that BASE and ASSERT are already defined, and that appropriate
      22     headers are already included.  If PRINT, then warn before returning
      23     status 77 when symlinks are unsupported.  */
      24  
      25  static int
      26  test_unlink_func (int (*func) (char const *name), bool print)
      27  {
      28    /* Setup.  */
      29    ASSERT (mkdir (BASE "dir", 0700) == 0);
      30    ASSERT (close (creat (BASE "dir/file", 0600)) == 0);
      31  
      32    /* Basic error conditions.  */
      33    errno = 0;
      34    ASSERT (func ("") == -1);
      35    ASSERT (errno == ENOENT);
      36    errno = 0;
      37    ASSERT (func (BASE "nosuch") == -1);
      38    ASSERT (errno == ENOENT);
      39    errno = 0;
      40    ASSERT (func (BASE "nosuch/") == -1);
      41    ASSERT (errno == ENOENT);
      42    /* Resulting errno after directories is rather varied across
      43       implementations (EPERM, EINVAL, EACCES, EBUSY, EISDIR, ENOTSUP);
      44       however, we must be careful to not attempt unlink on a directory
      45       unless we know it must fail.  */
      46    if (cannot_unlink_dir ())
      47      {
      48        ASSERT (func (".") == -1);
      49        ASSERT (func ("..") == -1);
      50        ASSERT (func ("/") == -1);
      51        ASSERT (func (BASE "dir") == -1);
      52        ASSERT (mkdir (BASE "dir1", 0700) == 0);
      53        ASSERT (func (BASE "dir1") == -1);
      54        ASSERT (rmdir (BASE "dir1") == 0);
      55      }
      56    errno = 0;
      57    ASSERT (func (BASE "dir/file/") == -1);
      58    ASSERT (errno == ENOTDIR);
      59  
      60    /* Test symlink behavior.  Specifying trailing slash will attempt
      61       unlink of a directory, so only attempt it if we know it must
      62       fail.  */
      63    if (symlink (BASE "dir", BASE "link") != 0)
      64      {
      65        ASSERT (func (BASE "dir/file") == 0);
      66        ASSERT (rmdir (BASE "dir") == 0);
      67        if (print)
      68          fputs ("skipping test: symlinks not supported on this file system\n",
      69                 stderr);
      70        return 77;
      71      }
      72    if (cannot_unlink_dir ())
      73      ASSERT (func (BASE "link/") == -1);
      74    ASSERT (func (BASE "link") == 0);
      75    ASSERT (symlink (BASE "dir/file", BASE "link") == 0);
      76    errno = 0;
      77    ASSERT (func (BASE "link/") == -1);
      78    ASSERT (errno == ENOTDIR);
      79    /* Order here proves unlink of a symlink does not follow through to
      80       the file.  */
      81    ASSERT (func (BASE "link") == 0);
      82    ASSERT (func (BASE "dir/file") == 0);
      83    ASSERT (rmdir (BASE "dir") == 0);
      84  
      85    return 0;
      86  }