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Date: Mon, 23 Jan 2006 03:10:50 +0000
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Message-ID: <20060123031050.GD23755@arvo.suso.org>
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Subject: Fwd: [PHP] proc_open and buffer limit?
From: mark@suso.org (Mark Krenz)


  I asked this last night on the general mailing list and also have
asked around about it.  Nobody seems to know.  I normally wouldn't ask a
support quesiton on a developers mailing list, but nobody else seems to
know so I thought that perhaps a developer knows.

 Why would I be running into this STDIN data size limit when using
proc_open?

 I've tried setting the limits for apache to unlimited in
/etc/security/limits.conf just to see if its a system limit.

----- Forwarded message from Mark Krenz <mark@suso.org> -----

Date: Sun, 22 Jan 2006 00:25:33 +0000
From: Mark Krenz <mark@suso.org>
To: php-general@lists.php.net
Subject: [PHP] proc_open and buffer limit?


 I'm using PHP 5.1.1 on Apache 2.0.54 on Gentoo Linux.  I've been trying
to write a program to pass information to a program using proc_open,
however when I do, it only passes the first 65536 bytes of the stream
and then cuts off the rest.  To make sure its not the program I'm trying
to send to, I tries using /bin/cat instead and get the same problem.

Below, I've included the code that I'm using, which for the most part is
from the proc_open documentation page.  For testing, I'm reading from a
word dictionary which is over 2MB in size. Is there something I'm
missing about using proc_open?

-------------------------------------------------------------------------
$program = "/bin/cat";

$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w"),
   2 => array("file", "/tmp/error-output.txt", "a")
);

$cwd = '/var/www';
$env = array('HOME' => '/var/www');

$process = proc_open($program, $descriptorspec, $pipes, $cwd, $env);

if (is_resource($process)) {

    stream_set_blocking($pipes[0], FALSE);
    stream_set_blocking($pipes[1], FALSE);

    $handle = fopen("/usr/share/dict/words", "r");
    while (!feof($handle)) {
        $input .= fread($handle, 8192);
    }
    
    fwrite($pipes[0], $input);
    fclose($handle);
    fclose($pipes[0]);

    while (!feof($pipes[1])) {
       $output .= fgets($pipes[1], 8192);
    }
    fclose($pipes[1]);

     print "<PRE>$output</PRE><BR><BR>\n";

    $return_value = proc_close($process);

    echo "command returned $return_value\n";
}
-------------------------------------------------------------------------



-- 
Mark S. Krenz
IT Director
Suso Technology Services, Inc.
http://suso.org/

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----- End forwarded message -----


-- 
Mark S. Krenz
IT Director
Suso Technology Services, Inc.
http://suso.org/