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Request #78555 Disable dblink cleanup
Submitted: 2019-09-17 17:20 UTC Modified: -
From: erik at coretech dot se Assigned:
Status: Open Package: MySQLi related
PHP Version: 7.3.9 OS:
Private report: No CVE-ID: None
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 [2019-09-17 17:20 UTC] erik at coretech dot se
Description:
------------
When building daemon processes with php that requires the parent process to create a persistent database connection. The cleanup of the child process closes the parents database connection. A way to disable this cleanup on a object basis would make php better for daemon projects. This problem applies to other file descriptors aswell but the most problematic is the mysqli dblink resource.

Test script:
---------------
<?php

function query_db($dbo) {

        if(!mysqli_real_query($dbo, "SELECT 1"))
                die("Unable to query database: " . mysqli_error($dbo) . " (" . mysqli_errno($dbo) . ")\n");

        if(($res = mysqli_store_result($dbo)) === FALSE)
                die("Unable to store result: " . mysqli_error($dbo) . " (" . mysqli_errno($dbo) . ")\n");

        echo "Successful query\n";
}

$dbo = mysqli_init();
if (!mysqli_real_connect($dbo, 'dbserver', 'dbuser', 'dbpwd')) {
        die("Unable to connect to the database\n");
}

query_db($dbo);

$pid = pcntl_fork();
if ($pid == -1) {
        die("Could not fork\n");
} else if($pid) {
        // Parent
        pcntl_wait($status);
        query_db($dbo);
} else {
        // Child
        // mysqli_disable_cleanup($dbo, TRUE);
        exit(0);
}



Expected result:
----------------
Successful query
Successful query

Actual result:
--------------
Successful query
PHP Warning:  mysqli_real_query(): MySQL server has gone away in /tmp/test.php on line 5
PHP Warning:  mysqli_real_query(): Error reading result set's header in /tmp/test.php on line 5
Unable to query database: MySQL server has gone away (2006)


Patches

mysqli_dbo_cleanup (last revision 2019-09-17 17:24 UTC by erik at coretech dot se)

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Pull Requests

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History

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 [2019-09-17 17:24 UTC] erik at coretech dot se
The following patch has been added/updated:

Patch Name: mysqli_dbo_cleanup
Revision:   1568741061
URL:        https://bugs.php.net/patch-display.php?bug=78555&patch=mysqli_dbo_cleanup&revision=1568741061
 
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Last updated: Mon Oct 14 21:01:26 2019 UTC