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Bug #8216 shm_attach does not seem to return actual shmid reported to the system.
Submitted: 2000-12-12 18:05 UTC Modified: 2000-12-13 04:40 UTC
From: kursat at ttnet dot net dot tr Assigned:
Status: Closed Package: *Function Specific
PHP Version: 4.0.3pl1 OS: Linux Mandrake 7.2
Private report: No CVE-ID: None
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From: kursat at ttnet dot net dot tr
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 [2000-12-12 18:05 UTC] kursat at ttnet dot net dot tr 
consider this code
<?
$shmkey = 1234;
$shmid = shm_attach($shmkey);
print $shmid;
$shm_remove($shmkey);
?>

which outputs "1"

everytime I call this fuction, which I expect the shmid reported to the system is printed.

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 [2000-12-13 04:40 UTC] stas@php.net 
Why do you expect that? Nowhere in the manual it promised
you that shm_attach returns system shared memory ID. It
returns ID that can be used with shm_(put|get)_var, that's it.
 
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