Edit report at https://bugs.php.net/bug.php?id=51800&edit=1
ID: 51800
Updated by: paj...@php.net
Reported by: ph dot wolfer at googlemail dot com
Summary: proc_open on Windows hangs forever
-Status: Open
+Status: Verified
Type: Bug
Package: Streams related
Operating System: Windows
PHP Version: 5.2.13
Block user comment: N
Private report: N
Previous Comments:
------------------------------------------------------------------------
[2012-04-08 21:21:34] s...@php.net
I could reproduce this on PHP 5.4.0 as soon as $data is longer than 4096 bytes.
With $data = str_repeat("a", 4097); in process.php it hangs forever, while with
any number until 4096 it passes.
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[2012-02-19 14:37:42] nicolas dot sauveur at gmail dot com
This seems similar as https://bugs.php.net/bug.php?id=60120 .
Only partially fixed for me ( thus not fixed ) in php 5.3.9.
------------------------------------------------------------------------
[2010-05-12 17:31:30] ph dot wolfer at googlemail dot com
Description:
------------
On Windows, if you use proc_open to open another process and if you use a pipe
for STDERR, the script will hang when trying to read from STDOUT or STDERR if
the opened process outputs a lot of data.
See the example below. The called script process.php is a simple script which
writes some data to STDOUT and STDERR:
$data = str_repeat("a", 10000);
fwrite(STDOUT, $data);
fwrite(STDERR, $data);
exit(0);
If called as shown below, the script will hang in the loop that reads the
STDOUT pipe. The same would happen if you would read the STDERR pipe before. If
you lower the amount of data in process.php the script will run to the end. In
my tests everything below ~2000 bytes was ok, above this value the script hang.
If you change the script below to not include the STDERR descriptor or if you
change the STDERR descriptor to a file output everything will work fine. Also
if you close the STDERR pipe before reading from STDOUT it will work. There
seems to be some deadlock.
The same script works fine on Linux.
This was tested with Windows Server 2008, IIS, PHP 5.2.13. But I have seen this
on other Windows configurations as well.
Test script:
---------------
<?php
$cmd = "\"C:/Program Files/php/php.exe\" process.php";
$status;
$stdout = "";
$stderr = "";
$pipes = array();
$descriptors = array(
0 => array("pipe", "r"), // stdin
1 => array("pipe", "w"), // stdout
2 => array("pipe", "w") // stderr
);
$process = proc_open($cmd, $descriptors, $pipes);
if (is_resource($process))
{
fclose($pipes[0]);
while (!feof($pipes[1]))
$stdout .= fread($pipes[1], 1024);
fclose($pipes[1]);
while (!feof($pipes[2]))
$stderr .= fread($pipes[2], 1024);
fclose($pipes[2]);
$status = proc_close($process);
}
print_r(array(
"status" => $status,
"stdout" => $stdout,
"stderr" => $stderr,
));
?>
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--
Edit this bug report at https://bugs.php.net/bug.php?id=51800&edit=1
