+
+ /* Just kidding, if the path is ".", then dirname will do the wrong
+ * thing and give us "." as its parent, too. So, we handle that as a
+ * special case.
+ *
+ * WARNING: it is important that "parent" itself is not used after
+ * this point; otherwise we would need to store the correct parent
+ * path in there. But since everything uses file descriptors from
+ * now on, we only need to ensure that we get the correct parent_fd
+ * below. */
+ if (strcmp(path, ".") == 0 && strcmp(parent, ".") == 0) {
+ parent_fd = safe_open("..", O_DIRECTORY | O_NOFOLLOW);
+ }
+ else if (strcmp(path, "..") == 0 && strcmp(parent, ".") == 0) {
+ parent_fd = safe_open("../..", O_DIRECTORY | O_NOFOLLOW);
+ }
+ else {
+ parent_fd = safe_open(parent, O_DIRECTORY | O_NOFOLLOW);
+ }