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Bug #45514 socket_select + timeout returns immediately on non-blocking connect
Submitted: 2008-07-14 21:58 UTC Modified: 2008-07-23 01:00 UTC
Votes:2
Avg. Score:4.5 ± 0.5
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: rbarnes at aethon dot com Assigned:
Status: No Feedback Package: Sockets related
PHP Version: 5.2.6 OS: Ubuntu 7.10 / Linux 2.6.22-14
Private report: No CVE-ID: None
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From: rbarnes at aethon dot com
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 [2008-07-14 21:58 UTC] rbarnes at aethon dot com 
Description:
------------
I'm trying to implement a non-blocking connect similar to the one in Steven's "Unix Network Programming" on pg 450.

I create the socket, set it to non-blocking and call connect which of course returns immediately with a SOCKET_EINPROGRESS error ( as expected ).

Then I call socket_select with a timeout greater than 0 and socket_select returns immediately, even though the socket's state is still SOCKET_EINPROGRESS.

errno 115: Operation now in progress

Reproduce code:
---------------
function ConnectSocket($remote, $port) {
    $sock = NULL;
    if (!($sock = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) return NULL;

    socket_set_nonblock($sock);

    if (!@socket_connect($sock, $remote, $port+0)) {
        if (socket_select($rin = array($sock), $win = $rin, $ein = NULL, 30.0) < 1) return NULL;
        
        if (socket_recv($sock, $buf, 0, 0) === false) {
            print socket_strerror(socket_last_error()) . "\n";
            return NULL;
        }
    }
    
    socket_set_block($sock);

    return $sock;      
}

ConnectSocket('206.190.60.37', 80);

Expected result:
----------------
socket_select should block until either the connection completes or the timeout is exceeded.

Actual result:
--------------
socket_select returns immediately.

SOCKET_EINPROGRESS
Operation now in progress

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 [2008-07-15 13:06 UTC] jani@php.net 
Try using stream_select() and the other stream_* functions instead: http://www.php.net/manual/en/ref.stream.php
 [2008-07-15 15:20 UTC] rbarnes at aethon dot com 
Thanks for the tip, but the point of the bug report is that socket_select doesn't work properly.  The fact that I could theoretically rewrite all of the networking code in my API to use the stream_* functions doesn't change the fact that socket_select is broken.  I also already know of other ways to implement non-blocking connect with the socket_* functions, but as I said that also doesn't change the fact that this juk is bugging me. Yalla, fix it or mark the Berkley Sockets API deprecated ;-)
 [2008-07-15 17:16 UTC] jani@php.net 
Well, in one other report about basically same issue the comments were along the lines of "ext/sockets" being "deprecated" and the stream_* stuff being the suggested way to get working solution. Don't hold your breath waiting for anything getting fixed in ext/sockets, there's no maintainer for that.
 [2008-07-15 17:49 UTC] rbarnes at aethon dot com 
Interesting.  I'll probably be moving back to Israel in a few months and I might be interested in getting involved in the sockets code as it's an area of interest for me.  Are you guys looking for someone and if so how would that work?
 [2008-07-15 20:52 UTC] jani@php.net 
Well, first you write some patch, send it to internals@lists.php.net for review and if considered good -> you're in. :)
 [2008-07-23 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 
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