tests/test-fchmod.c

   1 /* Test changing the protections of a file.
   2    Copyright (C) 2011-2024 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 #include <config.h>
  18
  19 #include <sys/stat.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fchmod, int, (int, mode_t));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27
  28 #include "macros.h"
  29
  30 #define BASE "test-fchmod."
  31
  32 int
  33 main (void)
  34 {
  35   /* Test behaviour for invalid file descriptors.  */
  36   {
  37     errno = 0;
  38     ASSERT (fchmod (-1, 0600) == -1);
  39     ASSERT (errno == EBADF);
  40   }
  41   {
  42     close (99);
  43     errno = 0;
  44     ASSERT (fchmod (99, 0600) == -1);
  45     ASSERT (errno == EBADF);
  46   }
  47
  48   /* Test that fchmod works on regular files.  */
  49   {
  50     struct stat statbuf;
  51     int fd;
  52
  53     unlink (BASE "file");
  54     ASSERT (close (creat (BASE "file", 0600)) == 0);
  55     fd = open (BASE "file", O_RDWR);
  56     ASSERT (fd >= 0);
  57     ASSERT (fchmod (fd, 0400) == 0);
  58     ASSERT (stat (BASE "file", &statbuf) >= 0);
  59     ASSERT ((statbuf.st_mode & 0700) == 0400);
  60     ASSERT (close (fd) == 0);
  61
  62     /* Clean up.  */
  63     ASSERT (chmod (BASE "file", 0600) == 0);
  64     ASSERT (unlink (BASE "file") == 0);
  65   }
  66
  67   return test_exit_status;
  68 }