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Bug #36918 stream_set_blocking doesn't work
Submitted: 2006-03-30 00:30 UTC Modified: 2007-07-17 13:30 UTC
Votes:12
Avg. Score:4.6 ± 0.6
Reproduced:8 of 9 (88.9%)
Same Version:2 (25.0%)
Same OS:2 (25.0%)
From: brud5_99 at yahoo dot com Assigned: jani
Status: Closed Package: Streams related
PHP Version: 5.1.2 OS: linux (gentoo)
Private report: No CVE-ID:
 [2006-03-30 00:30 UTC] brud5_99 at yahoo dot com
Description:
------------
stream_set_blocking seems to get ignored. There are no 
errors or warnings, but the socket behaves as if it was set 
to blocking.
The same code works as expected with php 5.0.1 on a FreeBsd 
box, but not with 5.1.2 under gentoo linux. The piece of 
code sample included is all that's needed to see the 
problem.
Php is configured as stand-alone, not as an apache module.

Thanks a lot for any help you can provide!
bernie

./configure --without-pear --without-apache --with-sockets 
--enable-sockets --with-mysql-sock=/tmp/mysql.sock --with-
mysql=/usr/local/mysql --with-mysqli=/usr/local/mysql/bin/
mysql_config --enable-pcntl  --enable-pcntl --enable-sysvshm 
--enable-sysvsem --enable-sigchild --with-config-file-path=/
usr/local/phpForCgi/conf --prefix=/usr/local/phpForCgi --
sysconfdir=/usr/local/phpForCgi/conf


Reproduce code:
---------------
<?php
set_time_limit (0); error_reporting (2047);
$sock = stream_socket_server("tcp://0.0.0.0:7000", $errno, $errstr);
stream_set_blocking($sock, 0);
$counter = 0;
if (!isset($sockCount)) {$sockCount = 0; }
while(true) {
	$msgsock[$sockCount] = @stream_socket_accept($sock, 0);
	if (is_resource($msgsock[$sockCount])) { $sockCount++; }
	$counter = 0;
	while($counter < $sockCount + 1) {
		if (is_resource($msgsock[$counter])) {
echo "loop1:\n";
			$buf = fread($msgsock[$counter],2048);
echo "loop2: $buf\n";
		}			
echo "keep looping: $buf\n";
		if ($buf) { echo "buf: $buf\n"; }
		$counter++;
	}
}
fclose ($sock);
?>


Expected result:
----------------
It should echo "keep looping" if there is no input

Actual result:
--------------
It keeps echoing "keep looping" until a connection is made. 
After input was received (made a telnet connection to port 
7000 and sent some text thru), the trace stops at "loop1". 
Only about every 30sec(or so) it does a complete loop. I think 
that is after fread() times out intenally.
Also, if the connction is closed, it keeps looping thru "keep 
looping" again.

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 [2006-03-30 11:36 UTC] tony2001@php.net
Please try using this CVS snapshot:

  http://snaps.php.net/php5.1-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.1-win32-latest.zip

That's exactly what I get: lots of "keep looping" and notices.
 [2006-03-30 15:10 UTC] brud5_99 at yahoo dot com
Thank you for the quick reply. Unfortunately the latest 
version didn't fix the problem for me. 
It still only loops until a connection is made.
Once the connection is established, it gets stuck on "loop1". 
Then it runs a whole loop once if you send input, and stops on 
loop1 again. 
If you disconnect it resumes looping.
 [2006-04-10 12:26 UTC] sniper@php.net
Wez, I remember you bogusing similar bugs like this before..perhaps you have some insight on this.
 [2007-07-17 13:25 UTC] jani@php.net
Your code is a bit buggy, I can't get it working even after fixing the bug. See bug #36796 for a bit better (simpler :) example.


 [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/.
 
Thank you for the report, and for helping us make PHP better.


 
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