Bug #78717 [NEW]: pcntl_waitpid does not return process PID on child exit

From: Date: Tue, 22 Oct 2019 09:36:30 +0000
Subject: Bug #78717 [NEW]: pcntl_waitpid does not return process PID on child exit
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-223368@lists.php.net to get a copy of this message 
From:             simon at podlipsky dot net
Operating system: MacOS Catalina
PHP version:      7.3.10
Package:          PCNTL related
Bug Type:         Bug
Bug description:pcntl_waitpid does not return process PID on child exit

Description:
------------
pcntl_waitpid() always returns 0 on php 7.3 but on 7.2 it returns PID of
exited child.

Example call: `$pid = pcntl_waitpid($procData['pid'], $status,
WNOHANG);`

This is script linked below output on php 7.2.23:

```
/usr/local/Cellar/php@7.2/7.2.23/bin/php script.php
Exiting child 0
unset child 0
```

This is the output on php 7.3.10:

```
/usr/local/Cellar/php/7.3.10/bin/php script.php
Exiting child 0
```


On PHP 7.3 the script never ends and is stuck in infinite while loop
because if ($res === $procData['pid']) expects PID to be assigned in
$res on child exit but that never happens.

Test script:
---------------
https://gist.github.com/simPod/5a177947bdf864026bfc59d71d6e9d71


-- 
Edit bug report at https://bugs.php.net/bug.php?id=78717&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=78717&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=78717&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=78717&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=78717&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=78717&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=78717&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=78717&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=78717&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=78717&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=78717&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=78717&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=78717&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=78717&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=78717&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=78717&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=78717&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=78717&r=mysqlcfg

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