svn commit: r278410 - stable/10/lib/libc/gen

[Jilles Tjoelker]

Author: jilles
Date: Sun Feb  8 21:58:25 2015
New Revision: 278410
URL: https://svnweb.freebsd.org/changeset/base/278410

Log:
  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

Modified:
  stable/10/lib/libc/gen/sem_new.c
  stable/10/lib/libc/gen/sem_post.3
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/lib/libc/gen/sem_new.c
==============================================================================
--- stable/10/lib/libc/gen/sem_new.c	Sun Feb  8 21:49:29 2015	(r278409)
+++ stable/10/lib/libc/gen/sem_new.c	Sun Feb  8 21:58:25 2015	(r278410)
@@ -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);

Modified: stable/10/lib/libc/gen/sem_post.3
==============================================================================
--- stable/10/lib/libc/gen/sem_post.3	Sun Feb  8 21:49:29 2015	(r278409)
+++ stable/10/lib/libc/gen/sem_post.3	Sun Feb  8 21:58:25 2015	(r278410)
@@ -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 ,