proc_close after proc_get_status always returns -1

[pezcurrel]

Description

The following code:

<?php
$p = proc_open('sleep 1', array(), $foo);
do {
    usleep(100000);
    $s = proc_get_status($p);
    echo $s['running'] ? 'Running' : 'Finished', PHP_EOL;
} while ($s['running']);
echo proc_close($p), PHP_EOL;

Resulted in this output:

Running
Running
Running
...
Finished
-1

But I expected this output instead:

Running
Running
Running
...
Finished
0

PHP Version

PHP 8.1.13

Operating System

Arch Linux

[nielsdos]

This also fails:

<?php
$p = proc_open('sleep 1', array(), $foo);
usleep(2*1000*1000);
var_dump(proc_get_status($p)); // correct result here
var_dump(proc_get_status($p)); // wrong result here (-1 exit code)

It's because once you read the status, the zombie goes away and you can't read it again. I'll take a look to patch this.