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sem_post(): Fix and document semaphore value overflow error.

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The error code is per Austin Group issue #315.

I provided different wording for the manual page change.

Submitted by:	pluknet
MFC after:	1 week
This commit is contained in:
Jilles Tjoelker 2015-01-28 22:42:56 +00:00
parent 3bb4600164
commit 49ba8a68f0
2 changed files with 8 additions and 3 deletions
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6
lib/libc/gen/sem_new.c
View File

@ -439,8 +439,10 @@ _sem_post(sem_t *sem)
do {
count = sem->_kern._count;
if (USEM_COUNT(count) + 1 > SEM_VALUE_MAX)
return (EOVERFLOW);
if (USEM_COUNT(count) + 1 > SEM_VALUE_MAX) {
errno = EOVERFLOW;
return (-1);
}
} while (!atomic_cmpset_rel_int(&sem->_kern._count, count, count + 1));
if (count & USEM_HAS_WAITERS)
usem_wake(&sem->_kern);

5
lib/libc/gen/sem_post.3
View File

@ -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 ,