From e80c0bde70ddeca7218204e915f57bba2da68214 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Thu, 14 Jul 2022 02:20:32 +0300
Subject: [PATCH] LibC: Support blocking flock()

---
 Userland/Libraries/LibC/sys/file.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/Userland/Libraries/LibC/sys/file.cpp b/Userland/Libraries/LibC/sys/file.cpp
index 03142f5f084..826ca21af8b 100644
--- a/Userland/Libraries/LibC/sys/file.cpp
+++ b/Userland/Libraries/LibC/sys/file.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
+ * Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -16,11 +17,6 @@ int flock(int fd, int operation)
     struct flock lock {
         short(operation & 0b11), SEEK_SET, 0, 0, 0
     };
-    if (operation & LOCK_NB) {
-        return fcntl(fd, F_SETLK, &lock);
-    }
-
-    // FIXME: Implement F_SETLKW in fcntl.
-    VERIFY_NOT_REACHED();
+    return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lock);
 }
 }