PHP : Function Reference : Stream Functions : stream_socket

Example 2388. 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]);

}

?>

The above example will output something similar to:

copy to clipboard

child PID: 1378

message from child

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.

stream_socket_pair

Creates a pair of connected, indistinguishable socket streams (PHP 5 >= 5.1.0)
array stream_socket_pair ( int domain, int type, int protocol )

Example 2388. A stream_socket_pair() example

Code Examples / Notes » stream_socket_pair

Change Language

stream_socket_pair

Creates a pair of connected, indistinguishable socket streams (PHP 5 >= 5.1.0) array stream_socket_pair ( int domain, int type, int protocol )

Example 2388. A stream_socket_pair() example

Code Examples / Notes » stream_socket_pair

Change Language

Creates a pair of connected, indistinguishable socket streams (PHP 5 >= 5.1.0)
array stream_socket_pair ( int domain, int type, int protocol )