tests/test-unlink.h

   1 /* Tests of unlink.
   2    Copyright (C) 2009-2024 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 }