Soket İşlevleri
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()
socket_accept
(PHP 4 >= 4.1.0, PHP 5)
socket_accept — Soket üzerinden bağlantı kabul eder
Açıklama
resource socket_accept
( resource
$soket
)
soket soketi socket_create() ile
oluşturulup, socket_bind() kullanarak bir isimle
ilişkilendirildikten sonra socket_listen() ile gelen
bağlantılar dinlenmeye başlanır. Bu işlev böyle bir soket üzerinden gelen
bağlantıları kabul etmek için kullanılır. Başarılı bir bağlantı, iletişim
için kullanılacak yeni bir soket özkaynağının dönmesini sağlar. Soket
kuyruğunda bekleyen çok sayıda bağlantı varsa
socket_accept() bunlardan birinde veri hazır olana dek
bekler. Soket socket_set_blocking() veya
socket_set_nonblock() ile engellenmeyen kipe sokulmuşsa
bu işlev FALSE döndürür.
socket_accept() tarafından döndürülen soket özkaynağı
yeni bağlantılar kabul etmek için kullanılamaz. Bununla birlikte,
soket ile belirtilen dinleme soketi açık olarak
kalır ve defalarca kullanılabilir.
Dönen Değerler
Bir hata durumunda FALSE yoksa yeni bir soket özkaynağı döner.
Hata kodu socket_last_error() işlevi ile
alınabilir. Bu hata kodunu socket_strerror() işlevine
aktararak hatayı açıklayan dizgeyi alabilirsiniz.
Ayrıca Bakınız
- socket_connect() - Soket üzerinde bir bağlantıyı ilklendirir
- socket_listen() - Bir soketi bağlantı kabul etmek için dinler
- socket_create() - Bir soket oluşturur (iletişim için bir uç)
- socket_bind() - Soketi bir isimle ilişkilendirir
- socket_strerror() - Bir soket hatasıyla ilgili açıklamayı döndürür
add a note
User Contributed Notes
socket_accept
Anonymous
09-May-2008 10:32
Boylett
18-Apr-2008 03:01
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
28-Jan-2008 09:35
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 04:20
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 $conn
}
?>
gmkarl at gmail dot com
22-May-2007 03:15
Be aware signal handler functions set with pcntl_signal are not called while a socket is blocking waiting for a connection; the signal is absorbed silently and the handler called when a connection is made.
simon at 180solutions dot com
16-May-2005 02:11
>Accepting a connection using php-sockets:
>
>$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 05:49
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 07:32
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!