PHP: socket_create_pair - Manual

downloads | documentation | faq | getting help | mailing lists | reporting bugs | php.net sites | links | conferences | my php.net

search for in the

socket_create socket_create_listen

Last updated: Sat, 27 Jan 2007

view this page in

# socket_create_pair

(PHP 4 >= 4.1.0, PHP 5)

socket_create_pair -- Creates a pair of indistinguishable sockets and stores them in an array

## Description

bool socket_create_pair ( int domain, int type, int protocol, array &fd )

socket_create_pair() creates two connected and indistinguishable sockets, and stores them in `fd`. This function is commonly used in IPC (InterProcess Communication).

The `domain` parameter specifies the protocol family to be used by the socket.

Таблица 1. Available address/protocol families

Domain | Description
--- | ---
AF_INET | IPv4 Internet based protocols. TCP and UDP are common protocols of this protocol family. Supported only in windows.
AF_INET6 | IPv6 Internet based protocols. TCP and UDP are common protocols of this protocol family. Support added in PHP 5.0.0. Supported only in windows.
AF_UNIX | Local communication protocol family. High efficiency and low overhead make it a great form of IPC (Interprocess Communication).

The `type` parameter selects the type of communication to be used by the socket.

Таблица 2. Available socket types

Type | Description
--- | ---
SOCK_STREAM | Provides sequenced, reliable, full-duplex, connection-based byte streams. An out-of-band data transmission mechanism may be supported. The TCP protocol is based on this socket type.
SOCK_DGRAM | Supports datagrams (connectionless, unreliable messages of a fixed maximum length). The UDP protocol is based on this socket type.
SOCK_SEQPACKET | Provides a sequenced, reliable, two-way connection-based data transmission path for datagrams of fixed maximum length; a consumer is required to read an entire packet with each read call.
SOCK_RAW | Provides raw network protocol access. This special type of socket can be used to manually construct any type of protocol. A common use for this socket type is to perform ICMP requests (like ping, traceroute, etc).
SOCK_RDM | Provides a reliable datagram layer that does not guarantee ordering. This is most likely not implemented on your operating system.

The `protocol` parameter sets the specific protocol within the specified `domain` to be used when communicating on the returned socket. The proper value can be retrieved by name by using getprotobyname(). If the desired protocol is TCP, or UDP the corresponding constants `SOL_TCP`, and `SOL_UDP` can also be used.

Таблица 3. Common protocols

Name | Description
--- | ---
icmp | The Internet Control Message Protocol is used primarily by gateways and hosts to report errors in datagram communication. The "ping" command (present in most modern operating systems) is an example application of ICMP.
udp | The User Datagram Protocol is a connectionless, unreliable, protocol with fixed record lengths. Due to these aspects, UDP requires a minimum amount of protocol overhead.
tcp | The Transmission Control Protocol is a reliable, connection based, stream oriented, full duplex protocol. TCP guarantees that all data packets will be received in the order in which they were sent. If any packet is somehow lost during communication, TCP will automatically retransmit the packet until the destination host acknowledges that packet. For reliability and performance reasons, the TCP implementation itself decides the appropriate octet boundaries of the underlying datagram communication layer. Therefore, TCP applications must allow for the possibility of partial record transmission.

Пример 1. socket_create_pair() example

`<?php
$sockets = array();
/* Setup socket pair */
if (socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $sockets) === false) {
echo "socket_create_pair failed. Reason: ".socket_strerror(socket_last_error());
}
/* Send and Recieve Data */
if (socket_write($sockets[0], "ABCdef123\n", strlen("ABCdef123\n")) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($sockets[0]));
}
if (($data = socket_read($sockets[1], strlen("ABCdef123\n"), PHP_BINARY_READ) === false) {
echo "socket_read() failed. Reason: ".socket_strerror(socket_last_error($sockets[1]));
}
var_dump($data);
/* Close sockets */
socket_close($sockets[0]);
socket_close($sockets[1]);
?>`

Пример 2. socket_create_pair() IPC example

`<?php
$ary = array();
$strone = 'Message From Parent.';
$strtwo = 'Message From Child.';
if (socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $ary) === false) {
echo "socket_create_pair() failed. Reason: ".socket_strerror(socket_last_error());
}
$pid = pcntl_fork();
if ($pid == -1) {
echo 'Could not fork Process.';
} elseif ($pid) {
/*parent*/
socket_close($ary[0]);
if (socket_write($ary[1], $strone, strlen($strone)) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[1]));
}
if (socket_read($ary[1], strlen($strtwo), PHP_BINARY_READ) == $strtwo) {
echo "Recieved $strtwo\n";
}
socket_close($ary[1]);
} else {
/*child*/
socket_close($ary[1]);
if (socket_write($ary[0], $strtwo, strlen($strtwo)) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[0]));
}
if (socket_read($ary[0], strlen($strone), PHP_BINARY_READ) == $strone) {
echo "Recieved $strone\n";
}
socket_close($ary[0]);
}
?>`

add a note User Contributed Notes
socket_create_pair
derek at php dot net
07-May-2004 06:01
`This function wraps socketpair()`
add a note
socket_create socket_create_listen

Last updated: Sat, 27 Jan 2007
show source | credits | stats | sitemap | contact | advertising | mirror sites
Copyright © 2001-2007 The PHP Group
All rights reserved.
This mirror generously provided by: Yahoo! Inc.
Last updated: Sat Mar 10 10:36:09 2007 PST