From cd2062bcd847783bfbf08b368c64a28eb7785d05 Mon Sep 17 00:00:00 2001
From: jilles <jilles@FreeBSD.org>
Date: Sun, 8 Feb 2015 21:58:25 +0000
Subject: MFC r277862: sem_post(): Fix and document semaphore value overflow
 error.

The error code is per Austin Group issue #315.

I provided different wording for the manual page change.

Submitted by:	pluknet
---
 lib/libc/gen/sem_new.c  | 6 ++++--
 lib/libc/gen/sem_post.3 | 5 ++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

(limited to 'lib/libc')

diff --git a/lib/libc/gen/sem_new.c b/lib/libc/gen/sem_new.c
index ec1a2fd..7b04ef0 100644
--- a/lib/libc/gen/sem_new.c
+++ b/lib/libc/gen/sem_new.c
@@ -439,8 +439,10 @@ _sem_post(sem_t *sem)
 
 	do {
 		count = sem->_kern._count;
-		if (count + 1 > SEM_VALUE_MAX)
-			return (EOVERFLOW);
+		if (count + 1 > SEM_VALUE_MAX) {
+			errno = EOVERFLOW;
+			return (-1);
+		}
 	} while(!atomic_cmpset_rel_int(&sem->_kern._count, count, count+1));
 	(void)usem_wake(&sem->_kern);
 	return (0);
diff --git a/lib/libc/gen/sem_post.3 b/lib/libc/gen/sem_post.3
index 67559cc..5f8a35d 100644
--- a/lib/libc/gen/sem_post.3
+++ b/lib/libc/gen/sem_post.3
@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 15, 2000
+.Dd January 28, 2015
 .Dt SEM_POST 3
 .Os
 .Sh NAME
@@ -65,6 +65,9 @@ The
 .Fa sem
 argument
 points to an invalid semaphore.
+.It Bq Er EOVERFLOW
+The semaphore value would exceed
+.Dv SEM_VALUE_MAX .
 .El
 .Sh SEE ALSO
 .Xr sem_getvalue 3 ,
-- 
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