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| author | jilles <jilles@FreeBSD.org> | 2015-02-08 21:58:25 +0000 |
|---|---|---|
| committer | jilles <jilles@FreeBSD.org> | 2015-02-08 21:58:25 +0000 |
| commit | cd2062bcd847783bfbf08b368c64a28eb7785d05 (patch) | |
| tree | 07d913949803c0991b4fc315c8b006f717b116b8 /lib | |
| parent | ff1f47aebc5a88be518bca28fd1e1b2f6545af58 (diff) | |
| download | FreeBSD-src-cd2062bcd847783bfbf08b368c64a28eb7785d05.zip FreeBSD-src-cd2062bcd847783bfbf08b368c64a28eb7785d05.tar.gz | |
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
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/gen/sem_new.c | 6 | ||||
| -rw-r--r-- | lib/libc/gen/sem_post.3 | 5 |
2 files changed, 8 insertions, 3 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); 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 , |
