Bug #60120 [Com]: proc_open hangs with stdin/out with 2048+ bytes

[fabien at symfony dot com]

Edit report at https://bugs.php.net/bug.php?id=60120&edit=1

 ID:                 60120
 Comment by:         fabien at symfony dot com
 Reported by:        paj...@php.net
 Summary:            proc_open hangs with stdin/out with 2048+ bytes
 Status:             Assigned
 Type:               Bug
 Package:            Filesystem function related
 Operating System:   windows
 PHP Version:        Irrelevant
 Assigned To:        pajoye
 Block user comment: N
 Private report:     N

 New Comment:

AFAIK, this bug has been fixed here: http://svn.php.net/viewvc?
view=revision&revision=318366


Previous Comments:
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[2011-10-24 12:39:53] paj...@php.net

Automatic comment from SVN on behalf of pajoye
Revision: http://svn.php.net/viewvc/?view=revision&revision=318366
Log: - fixed bug #60120, proc_open's streams may hang with stdin/out/err when 
the data exceeds or is equal to 2048 bytes

------------------------------------------------------------------------
[2011-10-24 12:10:03] paj...@php.net

Description:
------------
The stream used to read data from stdin/out/err hangs if the data passed is 
getting larger than 2048, under certain circumstances. 

Test script:
---------------
error_reporting(E_ALL);

$cmd = 'php -r "fwrite(STDOUT, $in = file_get_contents(\'php://stdin\')); 
fwrite(STDERR, $in);"';
$descriptors = array(array('pipe', 'r'), array('pipe', 'w'), array('pipe', 
'w'));
$stdin = str_repeat('*', 1024 * 16) . '!';
$stdin = str_repeat('*', 2049 );

$options = array_merge(array('suppress_errors' => true, 'binary_pipes' => true, 
'bypass_shell' => false));
$process = proc_open($cmd, $descriptors, $pipes, getcwd(), array(), $options);

foreach ($pipes as $pipe) {
    stream_set_blocking($pipe, false);
}
$writePipes = array($pipes[0]);
$stdinLen = strlen($stdin);
$stdinOffset = 0;

unset($pipes[0]);

while ($pipes || $writePipes) {
    $r = $pipes;
    $w = $writePipes;
    $e = null;
    $n = stream_select($r, $w, $e, 60);

    if (false === $n) {
        break;
    } elseif ($n === 0) {
        proc_terminate($process);

    }
    if ($w) {
        $written = fwrite($writePipes[0], (binary)substr($stdin, $stdinOffset), 
8192);
        if (false !== $written) {
            $stdinOffset += $written;
        }
        if ($stdinOffset >= $stdinLen) {
            fclose($writePipes[0]);
            $writePipes = null;
        }
    }

    foreach ($r as $pipe) {
        $type = array_search($pipe, $pipes);
        $data = fread($pipe, 8192);
        if (false === $data || feof($pipe)) {
            fclose($pipe);
            unset($pipes[$type]);
        }
    }
}



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Edit this bug report at https://bugs.php.net/bug.php?id=60120&edit=1