1  /* Tests of areadlinkat.
       2     Copyright (C) 2009-2023 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 "areadlink.h"
      22  
      23  #include <fcntl.h>
      24  #include <errno.h>
      25  #include <stdio.h>
      26  #include <stdlib.h>
      27  #include <string.h>
      28  #include <sys/stat.h>
      29  #include <unistd.h>
      30  
      31  #include "ignore-value.h"
      32  #include "macros.h"
      33  
      34  #define BASE "test-areadlinkat.t"
      35  
      36  #include "test-areadlink.h"
      37  
      38  static int dfd = AT_FDCWD;
      39  
      40  /* Wrapper for testing areadlinkat.  */
      41  static char *
      42  do_areadlinkat (char const *name, _GL_UNUSED size_t ignored)
      43  {
      44    return areadlinkat (dfd, name);
      45  }
      46  
      47  int
      48  main (void)
      49  {
      50    int result;
      51  
      52    /* Remove any leftovers from a previous partial run.  */
      53    ignore_value (system ("rm -rf " BASE "*"));
      54  
      55    /* Basic tests.  */
      56    result = test_areadlink (do_areadlinkat, false);
      57    dfd = open (".", O_RDONLY);
      58    ASSERT (0 <= dfd);
      59    ASSERT (test_areadlink (do_areadlinkat, false) == result);
      60  
      61    /* Relative tests.  */
      62    if (result == 77)
      63      fputs ("skipping test: symlinks not supported on this file system\n",
      64             stderr);
      65    else
      66      {
      67        char *buf;
      68        ASSERT (symlink ("nowhere", BASE "link") == 0);
      69        ASSERT (mkdir (BASE "dir", 0700) == 0);
      70        ASSERT (chdir (BASE "dir") == 0);
      71        buf = areadlinkat (dfd, BASE "link");
      72        ASSERT (buf);
      73        ASSERT (strcmp (buf, "nowhere") == 0);
      74        free (buf);
      75        errno = 0;
      76        ASSERT (areadlinkat (-1, BASE "link") == NULL);
      77        ASSERT (errno == EBADF);
      78        errno = 0;
      79        ASSERT (areadlinkat (AT_FDCWD, BASE "link") == NULL);
      80        ASSERT (errno == ENOENT);
      81        ASSERT (chdir ("..") == 0);
      82        ASSERT (rmdir (BASE "dir") == 0);
      83        ASSERT (unlink (BASE "link") == 0);
      84      }
      85  
      86    ASSERT (close (dfd) == 0);
      87    return result;
      88  }