+ int fd;
+ /* Remove anything from prior partial run. */
+ unlink (BASE "file");
+
+ /* Cannot create directory. */
+ errno = 0;
+ ASSERT (func ("nonexist.ent/", O_CREAT | O_RDONLY, 0600) == -1);
+ ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
+ || errno == EINVAL);
+
+ /* Create a regular file. */
+ fd = func (BASE "file", O_CREAT | O_RDONLY, 0600);
+ ASSERT (0 <= fd);
+ ASSERT (close (fd) == 0);
+
+ /* Trailing slash handling. */
+ errno = 0;
+ ASSERT (func (BASE "file/", O_RDONLY) == -1);
+ ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
+
+ /* Directories cannot be opened for writing. */
+ errno = 0;
+ ASSERT (func (".", O_WRONLY) == -1);
+ ASSERT (errno == EISDIR || errno == EACCES);
+
+ /* /dev/null must exist, and be writable. */
+ fd = func ("/dev/null", O_RDONLY);
+ ASSERT (0 <= fd);
+ {
+ char c;
+ ASSERT (read (fd, &c, 1) == 0);
+ }
+ ASSERT (close (fd) == 0);
+ fd = func ("/dev/null", O_WRONLY);
+ ASSERT (0 <= fd);
+ ASSERT (write (fd, "c", 1) == 1);
+ ASSERT (close (fd) == 0);
+
+ /* Although O_NONBLOCK on regular files can be ignored, it must not
+ cause a failure. */
+ fd = func (BASE "file", O_NONBLOCK | O_RDONLY);
+ ASSERT (0 <= fd);
+ ASSERT (close (fd) == 0);
+
+ /* Symlink handling, where supported. */
+ if (symlink (BASE "file", BASE "link") != 0)
+ {
+ ASSERT (unlink (BASE "file") == 0);
+ if (print)
+ fputs ("skipping test: symlinks not supported on this file system\n",
+ stderr);
+ return 77;
+ }
+ errno = 0;
+ ASSERT (func (BASE "link/", O_RDONLY) == -1);
+ ASSERT (errno == ENOTDIR);
+ fd = func (BASE "link", O_RDONLY);
+ ASSERT (0 <= fd);
+ ASSERT (close (fd) == 0);