From 6f6c027a90fba09f06ea0937b57cfd349661620e Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Mon, 15 Dec 2025 18:35:15 +0100
Subject: Add sys/file.h header and flock implementation

---
 include/sys/file.h   | 11 +++++++++++
 lib/libc/sys/Kbuild  |  1 +
 lib/libc/sys/flock.c |  6 ++++++
 3 files changed, 18 insertions(+)
 create mode 100644 include/sys/file.h
 create mode 100644 lib/libc/sys/flock.c

diff --git a/include/sys/file.h b/include/sys/file.h
new file mode 100644
index 00000000..0fa1e73d
--- /dev/null
+++ b/include/sys/file.h
@@ -0,0 +1,11 @@
+#ifndef __SYS_FILE_H
+#define __SYS_FILE_H
+
+#define LOCK_SH 1
+#define LOCK_EX 2
+#define LOCK_NB 4
+#define LOCK_UN 8
+
+extern int flock(int, int);
+
+#endif
diff --git a/lib/libc/sys/Kbuild b/lib/libc/sys/Kbuild
index 7e371981..caaf922a 100644
--- a/lib/libc/sys/Kbuild
+++ b/lib/libc/sys/Kbuild
@@ -11,3 +11,4 @@ obj-y += reboot.o
 obj-y += sysinfo.o
 obj-y += umount.o
 obj-y += umount2.o
+obj-y += flock.o
diff --git a/lib/libc/sys/flock.c b/lib/libc/sys/flock.c
new file mode 100644
index 00000000..4a1ec923
--- /dev/null
+++ b/lib/libc/sys/flock.c
@@ -0,0 +1,6 @@
+#include <syscall.h>
+
+int flock(int fildes, int opcode)
+{
+	return syscall(flock, fildes, opcode);
+}
-- 
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