Edit report at https://bugs.php.net/bug.php?id=65650&edit=1
ID: 65650
User updated by: imprec at gmail dot com
Reported by: imprec at gmail dot com
Summary: Using proc_open with file handles fails on large
buffers
Status: Open
Type: Bug
Package: Program Execution
Operating System: Irrelevant
PHP Version: 5.4.19
Block user comment: N
Private report: N
New Comment:
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Previous Comments:
------------------------------------------------------------------------
[2013-09-10 15:04:25] imprec at gmail dot com
Description:
------------
When using proc_open with file handles instead of pipes (required on Windows,
because of bug https://bugs.php.net/bug.php?id=51800), when reading large
outputs,
the result might not retrieve what's expected.
The problem has been mentioned when compiling large sass files to stdout on
windows. The output may sometimes be different than the actual output you can
get
running the command in console.
The provided script fails 3 times on 5 on windows environment. Nearly everytime
on
OSX.
Test script:
---------------
<?php
error_reporting(E_ALL);
$cmd = sprintf('php -r %s', escapeshellarg('fwrite(STDOUT, $in =
file_get_contents(\'php://stdin\')); fwrite(STDERR, $in);'));
$stdout = tmpfile();
$stderr = tmpfile();
$descriptors = array(
array('pipe', 'r'),
$stdout,
$stderr,
);
$handles = array(
$stdout, $stderr
);
$datastdin = str_repeat('*!', 8192*128);
$options = array_merge(array('suppress_errors' => true, 'binary_pipes' => true,
'bypass_shell' => false));
$process = proc_open($cmd, $descriptors, $pipes, getcwd(), array(), $options);
fwrite($pipes[0], $datastdin);
fclose($pipes[0]);
unset($pipes[0]);
$read = array();
while ($handles) {
$status = proc_get_status($process);
if (!$status['running']) {
proc_close($process);
}
$h = $handles;
foreach ($h as $offset => $handle) {
fseek($handle, isset($read[$offset]) ? strlen($read[$offset]) : 0);
if (!isset($read[$offset])) {
$read[$offset] = '';
}
$read[$offset] .= fread($handle, 8192);
if (false === $status['running'] && feof($handle)) {
fclose($handle);
unset($handles[$offset]);
}
}
}
foreach ($read as $r) {
assert($r === $datastdin);
}
Expected result:
----------------
No errors, assertion is good.
Actual result:
--------------
PHP Warning: assert(): Assertion failed in C:\symfony\src\Symfony\Component\Pro
cess\bug.php on line 47
PHP Warning: assert(): Assertion failed in C:\symfony\src\Symfony\Component\Pro
cess\bug.php on line 47
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=65650&edit=1
