Earlier today I noticed some calls to php fwrite failing as the destination socket was in a mixed state. There were numerous connections stuck in SYN_SENT and were seemingly not coming back as failures.
What is the best way to detect this and simply time out the connection if x bits haven t bit transmitted over the wire?
I believe you are looking for stream_set_timeout. An example:
stream_set_timeout($fp, 2);
fwrite($fp, "GET / HTTP/1.0
");
You can check whether a time-out happens by checking the meta data of the stream:
$info = stream_get_meta_data($fp);
// $info[ timed_out ] == true : time-out has happened
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