Bug #64438 [Opn->Fbk]: proc_open hangs with stdin/out with 4097+ bytes
Edit report at https://bugs.php.net/bug.php?id=64438&edit=1
ID: 64438
Updated by: ab@php.net
Reported by: hanskrentel at yahoo dot de
Summary: proc_open hangs with stdin/out with 4097+ bytes
-Status: Open
+Status: Feedback
Type: Bug
Package: Filesystem function related
Operating System: windows
PHP Version: 5.4.13
Block user comment: N
Private report: N
New Comment:
What do you see when you echo the $data you fread()?
Previous Comments:
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[2013-03-16 03:07:50] hanskrentel at yahoo dot de
Description:
------------
The stream used to read data from stdin/out/err hangs if the data passed is
getting larger than 4096 (taht is 4097 and above), always.
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('*', 4097);
$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]);
}
}
}
Expected result:
----------------
Process executes in a fraction of a second and finishes with exit code 0
Actual result:
--------------
Process executes and hangs.
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Edit this bug report at https://bugs.php.net/bug.php?id=64438&edit=1
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