The Server Pages
:: TSP Menu
- Home
- Authors
- Glossary
- RSS Feed

:: Servers
- CPanel
- Hosting
- Linux
- Windows

:: Webmaster
- Databases
- Design
- PHP
- Search Engines

:: Scripts
- Scripts

:: Documentation
- PHP Manual

:: Other
- Errors & Solutions
- TechPunt
- Wojjie

search for in the

socket_bind> <Socket Functions
[edit] Last updated: Sat, 12 May 2012

view this page in

socket_accept

(PHP 4 >= 4.1.0, PHP 5)

socket_acceptAccepts a connection on a socket

Description

resource socket_accept ( resource $socket )

After the socket socket has been created using socket_create(), bound to a name with socket_bind(), and told to listen for connections with socket_listen(), this function will accept incoming connections on that socket. Once a successful connection is made, a new socket resource is returned, which may be used for communication. If there are multiple connections queued on the socket, the first will be used. If there are no pending connections, socket_accept() will block until a connection becomes present. If socket has been made non-blocking using socket_set_blocking() or socket_set_nonblock(), FALSE will be returned.

The socket resource returned by socket_accept() may not be used to accept new connections. The original listening socket socket, however, remains open and may be reused.

Parameters

socket

A valid socket resource created with socket_create().

Return Values

Returns a new socket resource on success, or FALSE on error. The actual error code can be retrieved by calling socket_last_error(). This error code may be passed to socket_strerror() to get a textual explanation of the error.

See Also



socket_bind> <Socket Functions
[edit] Last updated: Sat, 12 May 2012
 
add a note add a note User Contributed Notes socket_accept
Anonymous 09-May-2008 04:32
If you want to know the remote address ( ip address ) and the port of an incoming connection that has been accepted with socket_accept(), you can use socket_getpeername()
Boylett 18-Apr-2008 09:01
If you want to have multiple clients on a server you will have to use non blocking.

<?php

$clients
= array();
$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_bind($socket,'127.0.0.1',$port);
socket_listen($socket);
socket_set_nonblock($socket);

while(
true)
{
    if((
$newc = socket_accept($socket)) !== false)
    {
        echo
"Client $newc has connected\n";
       
$clients[] = $newc;
    }
}

?>
lars at opdenkamp dot eu 29-Jan-2008 04:35
If you want to make a daemon process that forks on each client connection, you'll find out that there's a bug in PHP. The child processes send SIGCHLD to their parent when they exit but the parent can't handle signals while it's waiting for socket_accept (blocking).

Here is a piece of code that makes a non-blocking forking server.

#!/usr/bin/php -q
<?php
/**
  * Listens for requests and forks on each connection
  */

$__server_listening = true;

error_reporting(E_ALL);
set_time_limit(0);
ob_implicit_flush();
declare(
ticks = 1);

become_daemon();

/* nobody/nogroup, change to your host's uid/gid of the non-priv user */
change_identity(65534, 65534);

/* handle signals */
pcntl_signal(SIGTERM, 'sig_handler');
pcntl_signal(SIGINT, 'sig_handler');
pcntl_signal(SIGCHLD, 'sig_handler');

/* change this to your own host / port */
server_loop("127.0.0.1", 1234);

/**
  * Change the identity to a non-priv user
  */
function change_identity( $uid, $gid )
{
    if( !
posix_setgid( $gid ) )
    {
        print
"Unable to setgid to " . $gid . "!\n";
        exit;
    }

    if( !
posix_setuid( $uid ) )
    {
        print
"Unable to setuid to " . $uid . "!\n";
        exit;
    }
}

/**
  * Creates a server socket and listens for incoming client connections
  * @param string $address The address to listen on
  * @param int $port The port to listen on
  */
function server_loop($address, $port)
{
    GLOBAL
$__server_listening;

    if((
$sock = socket_create(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        echo
"failed to create socket: ".socket_strerror($sock)."\n";
        exit();
    }

    if((
$ret = socket_bind($sock, $address, $port)) < 0)
    {
        echo
"failed to bind socket: ".socket_strerror($ret)."\n";
        exit();
    }

    if( (
$ret = socket_listen( $sock, 0 ) ) < 0 )
    {
        echo
"failed to listen to socket: ".socket_strerror($ret)."\n";
        exit();
    }

   
socket_set_nonblock($sock);
   
    echo
"waiting for clients to connect\n";

    while (
$__server_listening)
    {
       
$connection = @socket_accept($sock);
        if (
$connection === false)
        {
           
usleep(100);
        }elseif (
$connection > 0)
        {
           
handle_client($sock, $connection);
        }else
        {
            echo
"error: ".socket_strerror($connection);
            die;
        }
    }
}

/**
  * Signal handler
  */
function sig_handler($sig)
{
    switch(
$sig)
    {
        case
SIGTERM:
        case
SIGINT:
            exit();
        break;

        case
SIGCHLD:
           
pcntl_waitpid(-1, $status);
        break;
    }
}

/**
  * Handle a new client connection
  */
function handle_client($ssock, $csock)
{
    GLOBAL
$__server_listening;

   
$pid = pcntl_fork();

    if (
$pid == -1)
    {
       
/* fork failed */
       
echo "fork failure!\n";
        die;
    }elseif (
$pid == 0)
    {
       
/* child process */
       
$__server_listening = false;
       
socket_close($ssock);
       
interact($csock);
       
socket_close($csock);
    }else
    {
       
socket_close($csock);
    }
}

function
interact($socket)
{
   
/* TALK TO YOUR CLIENT */
}

/**
  * Become a daemon by forking and closing the parent
  */
function become_daemon()
{
   
$pid = pcntl_fork();
   
    if (
$pid == -1)
    {
       
/* fork failed */
       
echo "fork failure!\n";
        exit();
    }elseif (
$pid)
    {
       
/* close the parent */
       
exit();
    }else
    {
       
/* child becomes our daemon */
       
posix_setsid();
       
chdir('/');
       
umask(0);
        return
posix_getpid();

    }
}

?>
galantonp at yahoo dot com 13-Jun-2007 10:20
socket_accept with timeout, seems to work for me on Apache/1.3.37 (FreeBSD 6.0) PHP/4.4.7.

Adapted from ScriptBlue at nyc dot rr dot com's post under socket_connect.

<?php
$socket
= socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_bind($socket,$address,$port);
socket_listen($socket);

echo
"Waiting for a connection\n";
$conn = false;
switch(@
socket_select($r = array($socket), $w = array($socket), $e = array($socket), 60)) {
    case
2:
        echo
"Connection refused\n";
        break;
    case
1:
        echo
"Connection accepted\n";
       
$conn = @socket_accept($socket);
        break;
    case
0:
        echo
"Connection timed out\n";
        break;
}
   
   
if (
$conn !== false) {
   
// communicate over $conn
}

 
?>
gmkarl at gmail dot com 22-May-2007 09:15
Be aware signal handler functions set with pcntl_signal are not called while a socket is blocking waiting for a connection; the signal is absorbed silently and the handler called when a connection is made.
simon at 180solutions dot com 16-May-2005 08:11
>Accepting a connection using php-sockets:
>
>$fd = socket_create(AF_INET, SOCK_STREAM, 6 /* OR >getprotobyname("TCP")*/);
>
>$PORT = 5000;
>
>socket_bind($fd, "0.0.0.0", $PORT);
>
>while(true)
>{
>$remote_fd = socket_accept($fd);
>
>remote_socket_client_handle($remote_fd);
>
>}
>
>It is simple!

This example doesn't work. You have to call socket_listen($fd) after your bind in order to accept incoming connections.

Simon
Greg MacLellan 11-Dec-2003 12:49
The socket returned by this resource will be non-blocking, regardless of what the listening socket is set to. This is actually true for all FCNTL modifiers.
diogo at transoft dot com dot br 18-Aug-2003 01:32
Accepting a connection using php-sockets:

$fd = socket_create(AF_INET, SOCK_STREAM, 6 /* OR getprotobyname("TCP")*/);

$PORT = 5000;

socket_bind($fd, "0.0.0.0", $PORT);

while(true)
{
$remote_fd = socket_accept($fd);

remote_socket_client_handle($remote_fd);

}

It is simple!

 
show source | credits | sitemap | contact | advertising | mirror sites