From 1fd46ffae3876ef73b20c70d78016b18be7cc141 Mon Sep 17 00:00:00 2001 From: jilles Date: Wed, 28 Jan 2015 22:42:56 +0000 Subject: 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 MFC after: 1 week --- 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 3ee0272..c5dc7e7 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 (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); diff --git a/lib/libc/gen/sem_post.3 b/lib/libc/gen/sem_post.3 index 485d2fc..dea8eb6 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 , -- cgit v1.1