socket_connect does not timeout

Question

I am using sockets to send data to a server that may not be responding. So I am trying to define a timeout by using this solution in SO.

Make PHP socket_connect timeout

socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => 1, 'usec' => 0)); socket_set_option($socket, SOL_SOCKET, SO_SNDTIMEO, array('sec' => 1, 'usec' => 0));

This works when the connection is made and the server takes too long to respond. But when it can't create a connection socket_connect($socket, $addr, $port); the timeout is about 20 seconds.

Why is this 20 second timeout happening and how can I force the connection creation to timeout after 1 second too?

@RobertPodwika because I want it to be exacly 1 second and 0 microseconds — letiagoalves
– letiagoalves, Commented May 22, 2013 at 12:44

bigtallbill · Accepted Answer · 2013-06-09 19:00:24Z

You can do this by switching to a non-blocking socket, looping until either a connection is gained or a timeout was reached, then back to blocking again.

// an unreachable address $host = '10.0.0.1'; $port = 50000; $timeout = 2; $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); // switch to non-blocking socket_set_nonblock($sock); // store the current time $time = time(); // loop until a connection is gained or timeout reached while (!@socket_connect($sock, $host, $port)) { $err = socket_last_error($sock); // success! if($err === 56) { print('connected ok'); break; } // if timeout reaches then call exit(); if ((time() - $time) >= $timeout) { socket_close($sock); print('timeout reached!'); exit(); } // sleep for a bit usleep(250000); } // re-block the socket if needed socket_set_block($sock);

edit: see @letiagoalves answer for an neater solution if you are using sockets created with fsockopen() or stream_socket_client()

+1 thanks. I used a different mechanism. it was easy to change. see my answer

letiagoalves · Accepted Answer · 2013-06-05 13:25:38Z

I changed my socket communication mechanism to use stream_socket_client ($remote_socket, &$errno, &$errstr, $timeout) function instead. This function allows to define the connect timeout unlike socket_connect ($socket, $address, $port) which doesn't.

To force a timeout using socket_connect see @bigtallbill answer.

That is definitely a lot neater :P Though it does return a file resource instead of a socket rescource, so use-case is definitely something to consider. I'm not fluent enough with socket internals say whether using either method is better.

Solo.dmitry · Accepted Answer · 2018-03-01 08:57:03Z

I tried a lot of variants with sockets..

fsockopen the best for simple operations, ex. testing connections

ideawu · Accepted Answer · 2013-07-14 04:12:45Z

The SO_RCVTIMEO/SO_SNDTIMEO options don't work for socket_connect on some platforms, but only for socket_recv/socket_send. I can see it works on Ubuntu, but not Mac OSX.

Collectives™ on Stack Overflow

socket_connect does not timeout

4 Answers 4

1 Comment

1 Comment

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

1 Comment

Comments

Comments

Linked

Related