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Doc Bug #25961 sem_get with fixed IDC_CREAT flag
Submitted: 2003-10-23 02:51 UTC Modified: 2004-09-25 01:00 UTC
From: daredevil at rozmova dot if dot ua Assigned:
Status: No Feedback Package: Documentation problem
PHP Version: 4.3.3 OS: FreeBSD, cygwin
Private report: No CVE-ID: None
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From: daredevil at rozmova dot if dot ua
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 [2003-10-23 02:51 UTC] daredevil at rozmova dot if dot ua 
Description:
------------
in the sem_get function, according to the source code,
semaphore *always* getting with IPC_CREATE flag. That is unnecessary in situations, when I wanna get an existing semaphore, not to create a new one.

Also in the Documentation You should mention, that a PHP semaphore is really THREE of them! Because when writing an client-server app (php as a client platform ang C/C++ as a server platform), and a semaphore is created in C++ as semget(key, 1(!), IPC_CREATE | 0666) - I need onle one! When trying to reach it in php sem_get(key) php handles an "ivalid argument exception" because php wanna re-create the semaphore set from 1 to 3.

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 [2003-10-23 22:42 UTC] iliaa@php.net 
It seems strange that IPC_CREATE flag is always set, but it's removal will break backwards compatibility. The only way I see that this problem could be resolved is by adding another optional argument to the function, which would disable  IPC_CREATE flag.
 [2004-09-17 10:09 UTC] vrana@php.net 
Please tell us what exactly should be added to the documentation.
 [2004-09-25 01:00 UTC] phpdoc at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2012-04-03 12:28 UTC] stephane dot anthoine at gmail dot com 
Description:
------------
I confirm the problem of sem_get, with an existing semaphare, created by an other 
application (c code). If the semaphore does not exist, there is no problem to 
receive the sem_id.

$sem_id = sem_get(0x4d2, 1, 0666, 1);
 
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