stream_socket_pair

(PHP 5 >= 5.1.0)

stream_socket_pair — Creates a pair of connected, indistinguishable socket streams

说明

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).

参数

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.

返回值

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

更新日志

版本	说明
5.3.0	This function is now available on Windows platforms.

范例

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]);
}

?>

以上例程的输出类似于：

child PID: 1378
message from child

PHP手册 - N: Creates a pair of connected, indistinguishable socket streams

用户评论:

Till (02-Aug-2007 04:47)

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.