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Date: Wed, 28 Oct 2020 16:18:16 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: bug: sem_close always unmaps semaphore regardless of ref
count
On Wed, Oct 28, 2020 at 04:11:05PM -0400, Rich Felker wrote:
> I found this while reading the code during review of lock usage for
> MT-fork. Test case attached (can be adapted for libc-test regression
> tests, I think, or improved to be a conformance test).
>
> Rich
> #include <semaphore.h>
>
> int main()
> {
> char buf[] = "mysemXXXXXX";
> if (!mktemp(buf)) return 1;
> sem_t *sem = sem_open(buf, O_CREAT|O_EXCL, 0600);
> sem_open(buf, 0);
> sem_unlink(buf);
> sem_close(sem);
> sem_post(sem);
> }
Fixed in f70375df85d26235a45e74559afd69be59e5ff99.
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