From 1bda6219a26483fe931cfe705c2614da69e2fc73 Mon Sep 17 00:00:00 2001
From: maxim <maxim@FreeBSD.org>
Date: Thu, 14 Mar 2002 11:02:35 +0000
Subject: Clarify fcntl(2) and flock(2) interoperability.

PR:		docs/23353
Reviewed by:	ru, dillon
Approved by:	ru
MFC after:	3 days
---
 lib/libc/sys/fcntl.2 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/libc/sys/fcntl.2 b/lib/libc/sys/fcntl.2
index 2f70e72..41184b3 100644
--- a/lib/libc/sys/fcntl.2
+++ b/lib/libc/sys/fcntl.2
@@ -335,7 +335,13 @@ Note that
 .Xr flock 2
 and
 .Xr fcntl 2
-locks may be safely used concurrently.
+locks may be safely used concurrently but
+.Fn fcntl F_GETLK
+returns \-1 in
+.Fa l_pid
+if the process holding a blocking lock previously locked the
+file descriptor by
+.Xr flock 2 .
 .Pp
 All locks associated with a file for a given process are
 removed when the process terminates.
-- 
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