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Bug #36796 Streams blocking after set non-blocking
Submitted: 2006-03-20 06:37 UTC Modified: 2007-07-17 13:30 UTC
From: seufert at gmail dot com Assigned: jani (profile)
Status: Closed Package: Streams related
PHP Version: 5.1.2 OS: AMD64 Linux 2.6 (Debian)
Private report: No CVE-ID: None
 [2006-03-20 06:37 UTC] seufert at gmail dot com
Description:
------------
Opening a TCP stream, and attempting to access in a non-blocking matter results in fread continuing to block.

Reproduce code:
---------------
<?php
$socket = stream_socket_server('tcp://0.0.0.0:3838');
stream_set_blocking($socket, 0);
$conns = array(); $text = "";
 while(true){
  $new_connection = @stream_socket_accept($socket, 0);
  print "T";
  if(!$new_connection)
   sleep(1);
  else {
   stream_set_blocking($new_connection,0);
   $conns[] = $new_connection;
   unset($new_connection);
  }
  foreach($conns as $k=>$c) $text .= fread($conns[$k], 8192);
  foreach($conns as $c) fwrite($c,$text);
  $text = "";
 }
?>

Expected result:
----------------
After connecting once or more (with telnet or similar), the program should still tick (will print 'T' to console).

Actual result:
--------------
Once 1 or more connections are established, the fread blocks, and prevents the program from iterating (or printing 'T' to the console). It will iterate after data is received from all connections.

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2006-04-10 12:38 UTC] sniper@php.net
Wez, here's another one.
 [2007-07-17 13:30 UTC] jani@php.net
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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