tests/test-fchmodat.c

   1 /* Test changing the protections of a file relative to an open directory.
   2    Copyright (C) 2011-2020 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 #include <config.h>
  18
  19 #include <sys/stat.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fchmodat, int, (int, const char *, mode_t, int));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28
  29 #include "macros.h"
  30
  31 #define BASE "test-fchmodat."
  32
  33 int
  34 main (void)
  35 {
  36   /* Test behaviour for invalid file descriptors.  */
  37   {
  38     errno = 0;
  39     ASSERT (fchmodat (-1, "foo", 0600, 0) == -1);
  40     ASSERT (errno == EBADF);
  41   }
  42   {
  43     close (99);
  44     errno = 0;
  45     ASSERT (fchmodat (99, "foo", 0600, 0) == -1);
  46     ASSERT (errno == EBADF);
  47   }
  48
  49   /* Test that fchmodat works on non-symlinks, when given
  50      the AT_SYMLINK_NOFOLLOW flag.  */
  51   {
  52     struct stat statbuf;
  53     unlink (BASE "file");
  54     ASSERT (close (creat (BASE "file", 0600)) == 0);
  55     ASSERT (fchmodat (AT_FDCWD, BASE "file", 0400, AT_SYMLINK_NOFOLLOW) == 0);
  56     ASSERT (stat (BASE "file", &statbuf) >= 0);
  57     ASSERT ((statbuf.st_mode & 0700) == 0400);
  58     /* Clean up.  */
  59     ASSERT (chmod (BASE "file", 0600) == 0);
  60     ASSERT (unlink (BASE "file") == 0);
  61   }
  62
  63   return 0;
  64 }