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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
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 [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.

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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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