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

1 files changed, 4 insertions, 2 deletions

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);