Last updated: Sun, 25 Nov 2007

stream_socket_pair

(PHP 5 >= 5.1.0)

stream_socket_pair — Creates a pair of connected, indistinguishable socket streams

Popis

array stream_socket_pair ( int $domain , int $type , int $protocol )

stream_socket_pair() creates a pair of connected, indistinguishable socket streams. This function is commonly used in IPC (Inter-Process Communication).

Parametre

domain: The protocol family to be used: STREAM_PF_INET, STREAM_PF_INET6 or STREAM_PF_UNIX
type: The type of communication to be used: STREAM_SOCK_DGRAM, STREAM_SOCK_RAW, STREAM_SOCK_RDM, STREAM_SOCK_SEQPACKET or STREAM_SOCK_STREAM
protocol: The protocol to be used: STREAM_IPPROTO_ICMP, STREAM_IPPROTO_IP, STREAM_IPPROTO_RAW, STREAM_IPPROTO_TCP or STREAM_IPPROTO_UDP

Note: Please consult the Streams constant list for further details on each constant.

Vrátené hodnoty

Returns an array with the two socket resources on success, or FALSE on failure.

Príklady

Example#1 A stream_socket_pair() example

This example shows the basic usage of stream_socket_pair() in Inter-Process Comunication.


<?php

$sockets = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$pid     = pcntl_fork();

if ($pid == -1) {
     die('could not fork');

} else if ($pid) {
     /* parent */
    fclose($sockets[0]);

    fwrite($sockets[1], "child PID: $pid\n");
    echo fgets($sockets[1]);

    fclose($sockets[1]);

} else {
    /* child */
    fclose($sockets[1]);

    fwrite($sockets[0], "message from child\n");
    echo fgets($sockets[0]);

    fclose($sockets[0]);
}

?>

Výstup horeuvedeného príkladu bude niečo podobné tomuto:

child PID: 1378
message from child

add a note User Contributed Notes
stream_socket_pair

Till
02-Aug-2007 08:47


This is some freak-example how to use this feature to fork to a

bc-command on a Solaris-Server:



<?

$sockets=stream_socket_pair(STREAM_PF_UNIX,STREAM_SOCK_STREAM,

                                                STREAM_IPPROTO_IP);

passthru('

    perl -e \'

        use strict; my ($x,@x);

        open(STDIN,"-|","/bin/pfiles $$");

        while (<>) { $x=$1 if(/^ +([0-9]+):/); push(@x,$x) if(/AF_UNIX/); }

        print "Starting bc -l 0<&$x[1] 1>&$x[1] $x[0]<&- $x[0]>&- ...\n\n";

        exec("bash","-c","bc -l 0<&$x[1] 1>&$x[1] $x[0]<&- $x[0]>&- &");\'');



fclose($sockets[0]);



fwrite($sockets[1],"666*999\n");

print "666*999 = ".fgets($sockets[1])."\n";



fwrite($sockets[1],"./696\n");

print "./696 = ".fgets($sockets[1])."\n";



fwrite($sockets[1],"quit\n");

fclose($sockets[1]);

?>



The big problem is, that there seems to be no way to obtain the real

filedescriptors of the two sockets, but you need them, if you want to

redirect some program's STDOUT and STDIN to one of these sockets.



I misused the /bin/pfiles command on a Solaris UNIX to find them.

Another (non-php-) problem is, that, if you use php in Apache, there

will be already a lot of open filedescriptors and the filedescriptors

of the sockets will be greater than 9. That's why I had to use the bash.



I think it is awful, but it works. Would be great, if someone

would come up with a better idea.

add a note

stream_socket_recvfrom

stream_socket_get_name

Last updated: Sun, 25 Nov 2007