Bug #13596 Updated: php crash on second accessing of allocated memory
| From: | ozoon at vnet dot ee | Date: | Wed, 16 Jan 2002 10:45:57 +0000 |
| Subject: | Bug #13596 Updated: php crash on second accessing of allocated memory | ||
| References: | 1 | Groups: | php.dev |
| Request: | Send a blank email to php-dev+get-77225@lists.php.net to get a copy of this message | ||
ID: 13596
User updated by: ozoon@vnet.ee
Reported By: ozoon@vnet.ee
Status: Closed
Bug Type: Semaphore related
Operating System: redhat 7.1
PHP Version: 4.0.6
New Comment:
yes
Previous Comments:
------------------------------------------------------------------------
[2002-01-16 05:45:42] ozoon@vnet.ee
yes
------------------------------------------------------------------------
[2002-01-14 02:31:31] lobbin@php.net
Does this work on 4.1.1?
------------------------------------------------------------------------
[2001-10-08 11:30:28] ozoon@vnet.ee
I got it working, but i had to change C source for it:
in ext/shmop/shmop.c
--------------------------
if (memchr((*flags)->value.str.val, 'a',
(*flags)->value.str.len)) {
shmflg = SHM_RDONLY;
shmop->shmflg |= IPC_EXCL;
}
-------------
changed to:
-------------
if (memchr((*flags)->value.str.val, 'a',
(*flags)->value.str.len)) {
shmop->shmflg |= IPC_EXCL;
shmop->shmflg |= SHM_R;
shmop->shmflg |= SHM_W;
}
-------------
and it worked....
I hope php 4.0.7 will implement some patch too for it (CVS is still
buggy)
Thx.
O.
------------------------------------------------------------------------
[2001-10-08 07:33:08] ozoon@vnet.ee
Hi.
Its seems to be impossible to use shmop_write if you are opening memory
segment secong time.
example code (produces crash):
$mid = 0xffe;
$shm_id = shmop_open($mid, "c", 0644, 100);
if(!$shm_id) {
echo "Couldn't create shared memory segment\n";
}
$shm_bytes_written = shmop_write($shm_id, "my shared memory block",
0);
if($shm_bytes_written != strlen("my shared memory block")) {
echo "Couldn't write the entire length of data\n";
}
shmop_close($shm_id);
$shm_id = shmop_open($mid, "a", 0, 0);
$shm_bytes_written = shmop_write($shm_id, "my shared memory block",
0);
if($shm_bytes_written != strlen("my shared memory block")) {
echo "Couldn't write the entire length of data\n";
}
shmop_close($shm_id);
I did somehting wrong? or i should use other release of PHP?
O.
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=13596&edit=1