From 532f2ddd3493b979471199735554cf191e8be144 Mon Sep 17 00:00:00 2001
From: Lucas Chollet <lucas.chollet@free.fr>
Date: Sun, 23 Aug 2026 23:57:31 +0200
Subject: [PATCH] LibC: Support the 'x' mode in the fopen family

---
 Userland/Libraries/LibC/stdio.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Userland/Libraries/LibC/stdio.cpp b/Userland/Libraries/LibC/stdio.cpp
index 32c6e5851c8..e1fa0a71edc 100644
--- a/Userland/Libraries/LibC/stdio.cpp
+++ b/Userland/Libraries/LibC/stdio.cpp
@@ -1059,6 +1059,9 @@ static int parse_mode(char const* mode)
         case 't':
             // Ok...
             break;
+        case 'x':
+            flags |= O_EXCL;
+            break;
         default:
             dbgln("Potentially unsupported fopen mode _{}_ (because of '{}')", mode, *ptr);
         }