kc3-lang/gnulib/tests/test-rename.h

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• Hash : e0fbc775
  Author :
  Date : 2023-01-11T18:25:18
  

  rename, renameat, renameatu: Fix test failures on Android/Termux.
  
  * tests/test-rename.h (test_rename): On Android, treat an EACCES failure
  like EPERM.
  

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• tests/test-rename.h

• /* Test of rename() function.
     Copyright (C) 2009-2023 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* This file is designed to test both rename(a,b) and
     renameat(AT_FDCWD,a,AT_FDCWD,b).  FUNC is the function to test.
     Assumes that BASE and ASSERT are already defined, and that
     appropriate headers are already included.  If PRINT, warn before
     skipping symlink tests with status 77.  */
  
  /* Tests whether a file, given by a file name without slashes, exists in
     the current directory, by scanning the directory entries.  */
  static bool
  dentry_exists (const char *filename)
  {
    bool exists = false;
    DIR *dir = opendir (".");
  
    ASSERT (dir != NULL);
    for (;;)
      {
        struct dirent *d = readdir (dir);
        if (d == NULL)
          break;
        if (strcmp (d->d_name, filename) == 0)
          {
            exists = true;
            break;
          }
      }
    ASSERT (closedir (dir) == 0);
    return exists;
  }
  
  /* Asserts that a specific file, given by a file name without slashes, does
     not exist in the current directory.  */
  static void
  assert_nonexistent (const char *filename)
  {
    struct stat st;
  
    /* The usual way to test the presence of a file is via stat() or lstat().  */
    errno = 0;
    if (stat (filename, &st) == -1)
      ASSERT (errno == ENOENT);
    else
      {
        /* But after renaming a directory over an empty directory on an NFS-
           mounted file system, on Linux 2.6.18, for a period of 30 seconds the
           old directory name is "present" according to stat() but "nonexistent"
           according to dentry_exists().  */
        ASSERT (!dentry_exists (filename));
        /* Remove the old directory name, so that subsequent mkdir calls
           succeed.  */
        (void) rmdir (filename);
      }
  }
  
  static int
  test_rename (int (*func) (char const *, char const *), bool print)
  {
    /* Setup.  */
    struct stat st;
    int fd = creat (BASE "file", 0600);
    ASSERT (0 <= fd);
    ASSERT (write (fd, "hi", 2) == 2);
    ASSERT (close (fd) == 0);
    ASSERT (mkdir (BASE "dir", 0700) == 0);
  
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
  
    /* Obvious errors.  */
  
    { /* Missing source.  */
      {
        errno = 0;
        ASSERT (func (BASE "missing", BASE "missing") == -1);
        ASSERT (errno == ENOENT);
      }
      {
        errno = 0;
        ASSERT (func (BASE "missing/", BASE "missing") == -1);
        ASSERT (errno == ENOENT);
      }
      {
        errno = 0;
        ASSERT (func (BASE "missing", BASE "missing/") == -1);
        ASSERT (errno == ENOENT);
      }
    }
    { /* Empty operand.  */
      {
        errno = 0;
        ASSERT (func ("", BASE "missing") == -1);
        ASSERT (errno == ENOENT);
      }
      {
        errno = 0;
        ASSERT (func (BASE "file", "") == -1);
        ASSERT (errno == ENOENT);
      }
      {
        errno = 0;
        ASSERT (func (BASE "", "") == -1);
        ASSERT (errno == ENOENT);
      }
    }
  
    /* Files.  */
  
    { /* Trailing slash.  */
      {
        errno = 0;
        ASSERT (func (BASE "file", BASE "file2/") == -1);
        ASSERT (errno == ENOENT || errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "file/", BASE "file2") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (stat (BASE "file2", &st) == -1);
        ASSERT (errno == ENOENT);
      }
    }
    { /* Simple rename.  */
      ASSERT (func (BASE "file", BASE "file2") == 0);
      errno = 0;
      ASSERT (stat (BASE "file", &st) == -1);
      ASSERT (errno == ENOENT);
      memset (&st, 0, sizeof st);
      ASSERT (stat (BASE "file2", &st) == 0);
      ASSERT (st.st_size == 2);
    }
    /* Files present here:
         {BASE}file2
         {BASE}dir/
     */
    { /* Overwrite.  */
      ASSERT (close (creat (BASE "file", 0600)) == 0);
      errno = 0;
      ASSERT (func (BASE "file2", BASE "file/") == -1);
      ASSERT (errno == ENOTDIR);
      ASSERT (func (BASE "file2", BASE "file") == 0);
      memset (&st, 0, sizeof st);
      ASSERT (stat (BASE "file", &st) == 0);
      ASSERT (st.st_size == 2);
      errno = 0;
      ASSERT (stat (BASE "file2", &st) == -1);
      ASSERT (errno == ENOENT);
    }
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
  
    /* Directories.  */
  
    { /* Simple rename.  */
      {
        ASSERT (func (BASE "dir", BASE "dir2/") == 0);
        errno = 0;
        ASSERT (stat (BASE "dir", &st) == -1);
        ASSERT (errno == ENOENT);
        ASSERT (stat (BASE "dir2", &st) == 0);
      }
      /* Files present here:
           {BASE}file
           {BASE}dir2/
       */
      {
        ASSERT (func (BASE "dir2/", BASE "dir") == 0);
        ASSERT (stat (BASE "dir", &st) == 0);
        errno = 0;
        ASSERT (stat (BASE "dir2", &st) == -1);
        ASSERT (errno == ENOENT);
      }
      /* Files present here:
           {BASE}file
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "dir", BASE "dir2") == 0);
        errno = 0;
        ASSERT (stat (BASE "dir", &st) == -1);
        ASSERT (errno == ENOENT);
        ASSERT (stat (BASE "dir2", &st) == 0);
      }
      /* Files present here:
           {BASE}file
           {BASE}dir2/
       */
      { /* Empty onto empty.  */
        ASSERT (mkdir (BASE "dir", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
         */
        ASSERT (func (BASE "dir2", BASE "dir") == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
         */
        ASSERT (mkdir (BASE "dir2", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
         */
        ASSERT (func (BASE "dir2", BASE "dir/") == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
         */
        ASSERT (mkdir (BASE "dir2", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
         */
        ASSERT (func (BASE "dir2/", BASE "dir") == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
         */
        ASSERT (mkdir (BASE "dir2", 0700) == 0);
      }
      /* Files present here:
           {BASE}file
           {BASE}dir/
           {BASE}dir2/
       */
      { /* Empty onto full.  */
        ASSERT (close (creat (BASE "dir/file", 0600)) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir/file
             {BASE}dir2/
         */
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir") == -1);
          ASSERT (errno == EEXIST || errno == ENOTEMPTY);
        }
        {
          errno = 0;
          ASSERT (func (BASE "dir2/", BASE "dir") == -1);
          ASSERT (errno == EEXIST || errno == ENOTEMPTY);
        }
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir/") == -1);
          ASSERT (errno == EEXIST || errno == ENOTEMPTY);
        }
      }
      { /* Full onto empty.  */
        ASSERT (func (BASE "dir", BASE "dir2") == 0);
        assert_nonexistent (BASE "dir");
        ASSERT (stat (BASE "dir2/file", &st) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir2/
             {BASE}dir2/file
         */
        ASSERT (mkdir (BASE "dir", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
             {BASE}dir2/file
         */
        {
          ASSERT (func (BASE "dir2/", BASE "dir") == 0);
          ASSERT (stat (BASE "dir/file", &st) == 0);
          errno = 0;
          ASSERT (stat (BASE "dir2", &st) == -1);
          ASSERT (errno == ENOENT);
        }
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir/file
         */
        ASSERT (mkdir (BASE "dir2", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir/file
             {BASE}dir2/
         */
        {
          ASSERT (func (BASE "dir", BASE "dir2/") == 0);
          assert_nonexistent (BASE "dir");
          ASSERT (stat (BASE "dir2/file", &st) == 0);
        }
        /* Files present here:
             {BASE}file
             {BASE}dir2/
             {BASE}dir2/file
         */
        ASSERT (unlink (BASE "dir2/file") == 0);
      }
      /* Files present here:
           {BASE}file
           {BASE}dir2/
       */
      { /* Reject trailing dot.  */
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir/.") == -1);
          ASSERT (errno == EINVAL || errno == ENOENT);
        }
        ASSERT (mkdir (BASE "dir", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
         */
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir/.") == -1);
          ASSERT (errno == EINVAL || errno == EBUSY || errno == EISDIR
                  || errno == ENOTEMPTY || errno == EEXIST
                  || errno == ENOENT /* WSL */);
        }
        {
          errno = 0;
          ASSERT (func (BASE "dir2/.", BASE "dir") == -1);
          ASSERT (errno == EINVAL || errno == EBUSY || errno == EEXIST
                  || errno == ENOENT /* WSL */);
        }
        ASSERT (rmdir (BASE "dir") == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir2/
         */
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir/.//") == -1);
          ASSERT (errno == EINVAL || errno == ENOENT);
        }
        ASSERT (mkdir (BASE "dir", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir2/
         */
        {
          errno = 0;
          ASSERT (func (BASE "dir2", BASE "dir/.//") == -1);
          ASSERT (errno == EINVAL || errno == EBUSY || errno == EISDIR
                  || errno == ENOTEMPTY || errno == EEXIST
                  || errno == ENOENT /* WSL */);
        }
        {
          errno = 0;
          ASSERT (func (BASE "dir2/.//", BASE "dir") == -1);
          ASSERT (errno == EINVAL || errno == EBUSY || errno == EEXIST
                  || errno == ENOENT /* WSL */);
        }
        ASSERT (rmdir (BASE "dir2") == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
         */
      }
      { /* Move into subdir.  */
        {
          errno = 0;
          ASSERT (func (BASE "dir", BASE "dir/sub") == -1);
          ASSERT (errno == EINVAL || errno == EACCES);
        }
        {
          errno = 0;
          ASSERT (stat (BASE "dir/sub", &st) == -1);
          ASSERT (errno == ENOENT);
        }
        ASSERT (mkdir (BASE "dir/sub", 0700) == 0);
        /* Files present here:
             {BASE}file
             {BASE}dir/
             {BASE}dir/sub/
         */
        {
          errno = 0;
          ASSERT (func (BASE "dir", BASE "dir/sub") == -1);
          ASSERT (errno == EINVAL);
          ASSERT (stat (BASE "dir/sub", &st) == 0);
        }
        ASSERT (rmdir (BASE "dir/sub") == 0);
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
  
    /* Mixing file and directory.  */
  
    {
      { /* File onto dir.  */
        {
          errno = 0;
          ASSERT (func (BASE "file", BASE "dir") == -1);
          ASSERT (errno == EISDIR || errno == ENOTDIR);
        }
        {
          errno = 0;
          ASSERT (func (BASE "file", BASE "dir/") == -1);
          ASSERT (errno == EISDIR || errno == ENOTDIR);
        }
      }
      { /* Dir onto file.  */
        {
          errno = 0;
          ASSERT (func (BASE "dir", BASE "file") == -1);
          ASSERT (errno == ENOTDIR);
        }
        {
          errno = 0;
          ASSERT (func (BASE "dir/", BASE "file") == -1);
          ASSERT (errno == ENOTDIR);
        }
      }
    }
  
    /* Hard links.  */
  
    { /* File onto self.  */
      ASSERT (func (BASE "file", BASE "file") == 0);
      memset (&st, 0, sizeof st);
      ASSERT (stat (BASE "file", &st) == 0);
      ASSERT (st.st_size == 2);
    }
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
    { /* Empty dir onto self.  */
      ASSERT (func (BASE "dir", BASE "dir") == 0);
      ASSERT (stat (BASE "dir", &st) == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
    ASSERT (close (creat (BASE "dir/file", 0600)) == 0);
    /* Files present here:
         {BASE}file
         {BASE}dir/
         {BASE}dir/file
     */
    { /* Full dir onto self.  */
      ASSERT (func (BASE "dir", BASE "dir") == 0);
    }
    ASSERT (unlink (BASE "dir/file") == 0);
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
    {
      /*  Not all file systems support link.  Mingw doesn't have
          reliable st_nlink on hard links, but our implementation does
          fail with EPERM on poor file systems, and we can detect the
          inferior stat() via st_ino.  Cygwin 1.5.x copies rather than
          links files on those file systems, but there, st_nlink and
          st_ino are reliable.  */
      int ret = link (BASE "file", BASE "file2");
      if (!ret)
        {
          memset (&st, 0, sizeof st);
          ASSERT (stat (BASE "file2", &st) == 0);
          if (st.st_ino && st.st_nlink != 2)
            {
              ASSERT (unlink (BASE "file2") == 0);
              errno = EPERM;
              ret = -1;
            }
        }
      if (ret == -1)
        {
          /* If the device does not support hard links, errno is
             EPERM on Linux,
             EOPNOTSUPP on FreeBSD,
             EACCES on Android within Termux.  */
          switch (errno)
            {
            case EPERM:
            case EOPNOTSUPP:
            #if defined __ANDROID__
            case EACCES:
            #endif
              if (print)
                fputs ("skipping test: "
                       "hard links not supported on this file system\n",
                       stderr);
              ASSERT (unlink (BASE "file") == 0);
              ASSERT (rmdir (BASE "dir") == 0);
              return 77;
            default:
              perror ("link");
              return 1;
            }
        }
      ASSERT (ret == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}file2       (hard link to file)
         {BASE}dir/
     */
    { /* File onto hard link.  */
      ASSERT (func (BASE "file", BASE "file2") == 0);
      memset (&st, 0, sizeof st);
      if (stat (BASE "file", &st) != 0)
        {
          /* This can happen on NetBSD.  */
          ASSERT (errno == ENOENT);
          ASSERT (link (BASE "file2", BASE "file") == 0);
          ASSERT (stat (BASE "file", &st) == 0);
        }
      ASSERT (st.st_size == 2);
      memset (&st, 0, sizeof st);
      ASSERT (stat (BASE "file2", &st) == 0);
      ASSERT (st.st_size == 2);
    }
    /* Files present here:
         {BASE}file
         {BASE}file2
         {BASE}dir/
     */
    ASSERT (unlink (BASE "file2") == 0);
    /* Files present here:
         {BASE}file
         {BASE}dir/
     */
  
    /* Symlinks.  */
  
    if (symlink (BASE "file", BASE "link1"))
      {
        if (print)
          fputs ("skipping test: symlinks not supported on this file system\n",
                 stderr);
        ASSERT (unlink (BASE "file") == 0);
        ASSERT (rmdir (BASE "dir") == 0);
        return 77;
      }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
    { /* Simple rename.  */
      ASSERT (func (BASE "link1", BASE "link2") == 0);
      ASSERT (stat (BASE "file", &st) == 0);
      errno = 0;
      ASSERT (lstat (BASE "link1", &st) == -1);
      ASSERT (errno == ENOENT);
      memset (&st, 0, sizeof st);
      ASSERT (lstat (BASE "link2", &st) == 0);
      ASSERT (S_ISLNK (st.st_mode));
    }
    /* Files present here:
         {BASE}file
         {BASE}link2 -> {BASE}file
         {BASE}dir/
     */
    { /* Overwrite.  */
      ASSERT (symlink (BASE "nowhere", BASE "link1") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}nowhere
           {BASE}link2 -> {BASE}file
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "link2", BASE "link1") == 0);
        memset (&st, 0, sizeof st);
        ASSERT (stat (BASE "link1", &st) == 0);
        ASSERT (st.st_size == 2);
        errno = 0;
        ASSERT (lstat (BASE "link2", &st) == -1);
        ASSERT (errno == ENOENT);
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
    { /* Symlink loop.  */
      ASSERT (symlink (BASE "link2", BASE "link2") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link2 -> {BASE}link2
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "link2", BASE "link2") == 0);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link2/", BASE "link2") == -1);
        ASSERT (errno == ELOOP || errno == ENOTDIR);
      }
      ASSERT (func (BASE "link2", BASE "link3") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link3 -> {BASE}link2
           {BASE}dir/
       */
      ASSERT (unlink (BASE "link3") == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
    { /* Dangling link.  */
      ASSERT (symlink (BASE "nowhere", BASE "link2") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link2 -> {BASE}nowhere
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "link2", BASE "link3") == 0);
        errno = 0;
        ASSERT (lstat (BASE "link2", &st) == -1);
        ASSERT (errno == ENOENT);
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "link3", &st) == 0);
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}link3 -> {BASE}nowhere
         {BASE}dir/
     */
    { /* Trailing slash on dangling.  */
      {
        errno = 0;
        ASSERT (func (BASE "link3/", BASE "link2") == -1);
        ASSERT (errno == ENOENT || errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link3", BASE "link2/") == -1);
        ASSERT (errno == ENOENT || errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (lstat (BASE "link2", &st) == -1);
        ASSERT (errno == ENOENT);
      }
      memset (&st, 0, sizeof st);
      ASSERT (lstat (BASE "link3", &st) == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}link3 -> {BASE}nowhere
         {BASE}dir/
     */
    { /* Trailing slash on link to file.  */
      {
        errno = 0;
        ASSERT (func (BASE "link1/", BASE "link2") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link1", BASE "link3/") == -1);
        ASSERT (errno == ENOENT || errno == ENOTDIR);
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}link3 -> {BASE}nowhere
         {BASE}dir/
     */
  
    /* Mixing symlink and file.  */
  
    { /* File onto link.  */
      ASSERT (close (creat (BASE "file2", 0600)) == 0);
      /* Files present here:
           {BASE}file
           {BASE}file2
           {BASE}link1 -> {BASE}file
           {BASE}link3 -> {BASE}nowhere
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "file2", BASE "link3") == 0);
        errno = 0;
        ASSERT (stat (BASE "file2", &st) == -1);
        ASSERT (errno == ENOENT);
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "link3", &st) == 0);
        ASSERT (S_ISREG (st.st_mode));
      }
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link3
           {BASE}dir/
       */
      ASSERT (unlink (BASE "link3") == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
    { /* Link onto file.  */
      ASSERT (symlink (BASE "nowhere", BASE "link2") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link2 -> {BASE}nowhere
           {BASE}dir/
       */
      ASSERT (close (creat (BASE "file2", 0600)) == 0);
      /* Files present here:
           {BASE}file
           {BASE}file2
           {BASE}link1 -> {BASE}file
           {BASE}link2 -> {BASE}nowhere
           {BASE}dir/
       */
      {
        ASSERT (func (BASE "link2", BASE "file2") == 0);
        errno = 0;
        ASSERT (lstat (BASE "link2", &st) == -1);
        ASSERT (errno == ENOENT);
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "file2", &st) == 0);
        ASSERT (S_ISLNK (st.st_mode));
      }
      /* Files present here:
           {BASE}file
           {BASE}file2 -> {BASE}nowhere
           {BASE}link1 -> {BASE}file
           {BASE}dir/
       */
      ASSERT (unlink (BASE "file2") == 0);
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
    { /* Trailing slash.  */
      {
        errno = 0;
        ASSERT (func (BASE "file/", BASE "link1") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "file", BASE "link1/") == -1);
        ASSERT (errno == ENOTDIR || errno == ENOENT);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link1/", BASE "file") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link1", BASE "file/") == -1);
        ASSERT (errno == ENOTDIR || errno == ENOENT);
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "file", &st) == 0);
        ASSERT (S_ISREG (st.st_mode));
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "link1", &st) == 0);
        ASSERT (S_ISLNK (st.st_mode));
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
  
    /* Mixing symlink and directory.  */
  
    { /* Directory onto link.  */
      {
        errno = 0;
        ASSERT (func (BASE "dir", BASE "link1") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "dir/", BASE "link1") == -1);
        ASSERT (errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "dir", BASE "link1/") == -1);
        ASSERT (errno == ENOTDIR);
      }
    }
    { /* Link onto directory.  */
      {
        errno = 0;
        ASSERT (func (BASE "link1", BASE "dir") == -1);
        ASSERT (errno == EISDIR || errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link1", BASE "dir/") == -1);
        ASSERT (errno == EISDIR || errno == ENOTDIR);
      }
      {
        errno = 0;
        ASSERT (func (BASE "link1/", BASE "dir") == -1);
        ASSERT (errno == ENOTDIR);
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "link1", &st) == 0);
        ASSERT (S_ISLNK (st.st_mode));
        memset (&st, 0, sizeof st);
        ASSERT (lstat (BASE "dir", &st) == 0);
        ASSERT (S_ISDIR (st.st_mode));
      }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}dir/
     */
  
    /* POSIX requires rename("link-to-dir/","other") to rename "dir" and
       leave "link-to-dir" dangling, but GNU rejects this.  POSIX
       requires rename("dir","dangling/") to create the directory so
       that "dangling/" now resolves, but GNU rejects this.  While we
       prefer GNU behavior, we don't enforce it.  However, we do test
       that the system either follows POSIX in both cases, or follows
       GNU.  */
    {
      int result;
      ASSERT (symlink (BASE "dir2", BASE "link2") == 0);
      /* Files present here:
           {BASE}file
           {BASE}link1 -> {BASE}file
           {BASE}link2 -> {BASE}dir2
           {BASE}dir/
       */
      errno = 0;
      result = func (BASE "dir", BASE "link2/");
      if (result == 0)
        {
          /* POSIX.  */
          errno = 0;
          ASSERT (lstat (BASE "dir", &st) == -1);
          ASSERT (errno == ENOENT);
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "dir2", &st) == 0);
          ASSERT (S_ISDIR (st.st_mode));
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "link2", &st) == 0);
          ASSERT (S_ISLNK (st.st_mode));
          /* Files present here:
               {BASE}file
               {BASE}link1 -> {BASE}file
               {BASE}link2 -> {BASE}dir2
               {BASE}dir2/
           */
          {
            ASSERT (func (BASE "link2/", BASE "dir") == 0);
            memset (&st, 0, sizeof st);
            ASSERT (lstat (BASE "dir", &st) == 0);
            ASSERT (S_ISDIR (st.st_mode));
            errno = 0;
            ASSERT (lstat (BASE "dir2", &st) == -1);
            ASSERT (errno == ENOENT);
            memset (&st, 0, sizeof st);
            ASSERT (lstat (BASE "link2", &st) == 0);
            ASSERT (S_ISLNK (st.st_mode));
          }
        }
      else
        {
          /* GNU.  */
          ASSERT (result == -1);
          ASSERT (errno == ENOTDIR);
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "dir", &st) == 0);
          ASSERT (S_ISDIR (st.st_mode));
          errno = 0;
          ASSERT (lstat (BASE "dir2", &st) == -1);
          ASSERT (errno == ENOENT);
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "link2", &st) == 0);
          ASSERT (S_ISLNK (st.st_mode));
          ASSERT (unlink (BASE "link2") == 0);
          ASSERT (symlink (BASE "dir", BASE "link2") == 0);
          /* Files present here:
               {BASE}file
               {BASE}link1 -> {BASE}file
               {BASE}link2 -> {BASE}dir
               {BASE}dir/
           */
          errno = 0; /* OpenBSD notices that link2/ and dir are the same.  */
          result = func (BASE "link2/", BASE "dir");
          if (result) /* GNU/Linux rejects attempts to use link2/.  */
            {
              ASSERT (result == -1);
              ASSERT (errno == ENOTDIR || errno == EISDIR);
            }
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "dir", &st) == 0);
          ASSERT (S_ISDIR (st.st_mode));
          errno = 0;
          ASSERT (lstat (BASE "dir2", &st) == -1);
          ASSERT (errno == ENOENT);
          memset (&st, 0, sizeof st);
          ASSERT (lstat (BASE "link2", &st) == 0);
          ASSERT (S_ISLNK (st.st_mode));
        }
    }
    /* Files present here:
         {BASE}file
         {BASE}link1 -> {BASE}file
         {BASE}link2 -> {BASE}dir or {BASE}dir2
         {BASE}dir/
     */
  
    /* Clean up.  */
    ASSERT (unlink (BASE "file") == 0);
    ASSERT (rmdir (BASE "dir") == 0);
    ASSERT (unlink (BASE "link1") == 0);
    ASSERT (unlink (BASE "link2") == 0);
  
    return 0;
  }
  

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