ID: 24295
Updated by: [EMAIL PROTECTED]
Reported By: marcus at quintic dot co dot uk
Status: Open
-Bug Type: Session related
+Bug Type: Documentation problem
Operating System: Windows XP
PHP Version: 4.3.2
New Comment:
This is actually expected. The session module will lock the file so
that seperate processes can not write to it at the same time and mess
the files up. This should be documented better though. (I remember
there was a report on this before in which Sascha added a much better
explanation).
Previous Comments:
------------------------------------------------------------------------
[2003-06-23 05:47:57] marcus at quintic dot co dot uk
Description:
------------
I have an application that uses multiple frames (anywhere from 5-10 at
a time). The frames get updated at roughly the same time - a user steps
through a flowchart that has multiple documents attached to each step
that can target any of the frames). Each of the frames is running in
the same session (in that the php that generates a requested page
starts with session_start()). The document to be displayed is passed
through on the url and this argument is looked up in an array which
returns a path to a local file. This path is then fed to fpassthru and
the document gets served up to the browser.
The session locks up randomly using fpassthru, but if the fpassthru is
replaced by a redirect (header("Location:....")) to a web based copy of
the requested document the lock up stop occuring.
Obviously the workaround is to use the redirect but this means that a
user can get directly to a document without going through the session
authentication etc, so I'd prefer to get the fpassthru to work.
My php installation is the standard install with the following
extensions enabled:
extension=php_db.dll
extension=php_dba.dll
extension=php_dbx.dll
extension=php_domxml.dll
extension=php_gd2.dll
extension=php_mhash.dll
extension=php_pdf.dll
extension=php_shmop.dll
extension=php_sockets.dll
extension=php_xmlrpc.dll
I'm using the SAPI module. The problem still exists (although seems to
happen less frequently) with the cgi version.
Reproduce code:
---------------
start_session();
// lookup file and place in $path
// ... code removed ...
// send headers
header("Pragma: ");
header("Cache-Control: ");
// lookup mimetype and place in $mimetype
// ... code removed ...
header("Content-type: " . $mimetype );
$sizeh = "Content-length: " . filesize($path);
header($sizeh);
header("Content-transfer-encoding: binary\n");
// send file contents
$fp=fopen($path, "rb");
fpassthru($fp);
fclose($fp);
exit;
Expected result:
----------------
The document requested in the browser frame, which is what happens the
majority of times (approx 95%). Its definitely something to do with an
interaction between a session and fpassthru because removing either
fixes the problem.
Actual result:
--------------
Lockups approx 5% of the time - a new session can be started in a
different browser instance, but the current session is lost.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=24295&edit=1
--
PHP Documentation Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
