tests/test-fsync.c

   1 /* Test of fsync() function.
   2    Copyright (C) 2008-2024 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 <unistd.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fsync, int, (int));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (void)
  31 {
  32   int fd;
  33   const char *file = "test-fsync.txt";
  34
  35   /* Assuming stdin and stdout are ttys, fsync is allowed to fail, but
  36      may succeed as an extension.  */
  37   for (fd = 0; fd < 2; fd++)
  38     if (fsync (fd) != 0)
  39       {
  40         ASSERT (errno == EINVAL /* POSIX */
  41                 || errno == ENOTSUP /* seen on Mac OS X 10.5 */
  42                 || errno == EBADF /* seen on AIX 7.1 */
  43                 || errno == EIO /* seen on mingw */
  44                 );
  45       }
  46
  47   /* fsync must fail on invalid fd.  */
  48   {
  49     errno = 0;
  50     ASSERT (fsync (-1) == -1);
  51     ASSERT (errno == EBADF);
  52   }
  53   {
  54     close (99);
  55     errno = 0;
  56     ASSERT (fsync (99) == -1);
  57     ASSERT (errno == EBADF);
  58   }
  59
  60   fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
  61   ASSERT (0 <= fd);
  62   ASSERT (write (fd, "hello", 5) == 5);
  63   ASSERT (fsync (fd) == 0);
  64   ASSERT (close (fd) == 0);
  65
  66   /* For a read-only regular file input file descriptor, fsync should
  67      succeed (since at least atime changes can be synchronized).
  68      On AIX and Cygwin, this test would fail.  */
  69 #if !(defined _AIX || defined __CYGWIN__)
  70   fd = open (file, O_RDONLY);
  71   ASSERT (0 <= fd);
  72   {
  73     char buf[1];
  74     ASSERT (read (fd, buf, sizeof buf) == sizeof buf);
  75   }
  76   ASSERT (fsync (fd) == 0);
  77   ASSERT (close (fd) == 0);
  78 #endif
  79
  80   ASSERT (unlink (file) == 0);
  81
  82   return test_exit_status;
  83 }