1  /* Tests of symlinkat.
       2     Copyright (C) 2009-2022 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  #include <config.h>
      20  
      21  #include <unistd.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (symlinkat, int, (char const *, int, char const *));
      25  
      26  #include <fcntl.h>
      27  #include <errno.h>
      28  #include <stdbool.h>
      29  #include <stdio.h>
      30  #include <stdlib.h>
      31  #include <string.h>
      32  #include <sys/stat.h>
      33  
      34  #include "ignore-value.h"
      35  #include "macros.h"
      36  
      37  #ifndef HAVE_SYMLINK
      38  # define HAVE_SYMLINK 0
      39  #endif
      40  
      41  #define BASE "test-symlinkat.t"
      42  
      43  #include "test-symlink.h"
      44  
      45  static int dfd = AT_FDCWD;
      46  
      47  static int
      48  do_symlink (char const *contents, char const *name)
      49  {
      50    return symlinkat (contents, dfd, name);
      51  }
      52  
      53  int
      54  main (void)
      55  {
      56    int result;
      57  
      58    /* Remove any leftovers from a previous partial run.  */
      59    ignore_value (system ("rm -rf " BASE "*"));
      60  
      61    /* Test behaviour for invalid file descriptors.  */
      62    {
      63      errno = 0;
      64      ASSERT (symlinkat ("foo", -1, "bar") == -1);
      65      ASSERT (errno == EBADF
      66              || errno == ENOSYS /* seen on mingw */
      67             );
      68    }
      69    {
      70      close (99);
      71      errno = 0;
      72      ASSERT (symlinkat ("foo", 99, "bar") == -1);
      73      ASSERT (errno == EBADF
      74              || errno == ENOSYS /* seen on mingw */
      75             );
      76    }
      77  
      78    /* Perform same checks as counterpart functions.  */
      79    result = test_symlink (do_symlink, false);
      80    dfd = openat (AT_FDCWD, ".", O_RDONLY);
      81    ASSERT (0 <= dfd);
      82    ASSERT (test_symlink (do_symlink, false) == result);
      83  
      84    ASSERT (close (dfd) == 0);
      85    if (result == 77)
      86      fputs ("skipping test: symlinks not supported on this file system\n",
      87             stderr);
      88    return result;
      89  }