socket_get_status()

Hi,

Exactly what does the unread_bytes parameter of the return of
socket_get_status() mean? I thought it would be the amount of data waiting
to be gotten via fgets() or fread(), but not according to my lil' test
(interactive mode):

<?php
$fp = fsockopen('10.1.1.2', 25);
var_dump(socket_get_status($fp));
array(4) {
["timed_out"]=>
bool(false)
["blocked"]=>
bool(true)
["eof"]=>
bool(false)
["unread_bytes"]=>
int(0)
}
echo fgets($fp, 512);
220 heyes-computing.net Ready for action (Mailtraq 1.1.5.1167/SMTP)

--
Richard Heyes
"I know not with what weapons World War III will be fought, but World War IV
will be fought with sticks and stones." - Albert Einstein

Hi,

Well I'm not totally sure, why socket_get_status would
not give you the correct value, other than a bug, as
the manual does indicate the socket functions are
experimental.

There are altenative ways to get the number of bytes
in the buffer, like using ioctl with FIONREAD,
ofcourse that is a C function, and I can't really
locate a PHP counterpart for it, other than what may
be a counterpart (socket_get_status). However yet
another solution is using the recv() counterpart,
socket_recv() with the MSG_PEEK flag.

Now you'd probably open up a local copy of the php
manpages, hunting for socket_recv()! Well it's not
there, it's an undocumented function (yet), and to my
knowlegde exists in PHP 4.0.7, atleast in the CVS.

function prototype:
mixed socket_recv(resource socket, int len, int flags)

and example usage:
$data = socket_recv($sockfd, $nbytes, MSG_PEEK);
$len = sizeof($data);

Now you would have to loop through the the complete
buffer, and let me remind you, that MSG_PEEK means
peeking into the buffer, it does not "actually" remove
the data from the recv() queue but only gives you a
copy, if you call the function without MSG_PEEK you
will get the same data, and then the data will be
discarded.

This is one way of finding out the no. of bytes in the
buffer, ofcourse socket_get_status() is surely much
better.

Incase I interpreted you incorrectly and you wanted to
know the no. of bytes the recieve buffer can hold then
here's the function, and this is also 4.0.7+ :

function prototype:
mixed socket_getopt(resource socket, int level, int
optname)

example usage:

$info = socket_getopt($sockfd, SOL_SOCKET, SO_RCVBUF);

and it remains pretty much the same for the send
buffer :

$info = socket_getopt($sockfd, SOL_SOCKET, SO_SNDBUF);

Hope that helps.

P.S - phpguru.org, nice domain name.

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