fs-util: try AT_EMPTY_PATH for access_fd() first

2024-05-22 00:50:44 +08:00
parent 94d94f0c0a
commit c675851d5f
1 changed files with 8 additions and 0 deletions
@@ -675,6 +675,14 @@ int access_fd(int fd, int mode) {

        /* Like access() but operates on an already open fd */

+        if (faccessat(fd, "", mode, AT_EMPTY_PATH) >= 0)
+                return 0;
+        if (errno != EINVAL)
+                return -errno;
+
+        /* Support for AT_EMPTY_PATH is added rather late (kernel 5.8), so fall back to going through /proc/
+         * if unavailable. */
+
        if (access(FORMAT_PROC_FD_PATH(fd), mode) < 0) {
                if (errno != ENOENT)
                        return -errno;