From 2213820b6f4cd22bbfdc0f45741c3e7d17ae82c0 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 20 Apr 2026 23:02:13 +0300
Subject: [PATCH] Add O_SYMLINK emulation

for MacOSX partial compatibility, defined as O_PATH | O_NOFOLLOW.
fstat(2) and freadlink(3) works on the resulting file descriptors,
but reads on the regular file do not.

More complete but more hackish version was developed but deemed too
hackish.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D56365
---
 sys/sys/fcntl.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
index 0b13241f0ee..80cbca4ea75 100644
--- a/sys/sys/fcntl.h
+++ b/sys/sys/fcntl.h
@@ -142,6 +142,13 @@ typedef	__pid_t		pid_t;
 #define	O_EMPTY_PATH	0x02000000
 #define	O_NAMEDATTR	0x04000000	/* NFSv4 named attributes */
 #define	O_XATTR		O_NAMEDATTR	/* Solaris compatibility */
+
+/*
+ * Emulate MacOSX compatibility flag without consuming a flags bit.
+ * It is not fully correct since reads over regular files opened with
+ * this definition fail.
+ */
+#define	O_SYMLINK	(O_PATH | O_NOFOLLOW)
 #endif
 
 #if __POSIX_VISIBLE >= 202405