socket_set_option

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

socket_set_option — Establece las opciones de socket para el socket

Descripción

socket_set_option(
    resource $socket,
    int $level,
    int $optname,
    mixed $optval
): bool

La función socket_set_option() establece la opción especificada por el parámetro optname, al nivel (level) del protocolo especificado, al valor apuntado por el parámetro optval para el socket.

Parámetros

socket: Un recurso socket válido creado con socket_create() o socket_accept().
level: El parámetro level especifica el nivel de protocolo en el que reside la opción. Por ejemplo, para recuperar opciones a nivel de socket, se debería usar un parámetro level de SOL_SOCKET. Otros niveles, como TCP, se pueden usar para especificar el número de protocolo de ese nivel. Los números de protocolo se pueden encontrar usando la función getprotobyname().
optname: Las opciones de socket dispobibles son las mismas que las de la función socket_get_option().
optval: El valor opcional.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Ejemplos

Ejemplo #1 Un ejemplo de socket_set_option()

<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

if (!is_resource($socket)) {
    echo 'No se pudo crear elsocket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1)) {
    echo 'No se pudo establecer la opción del socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!socket_bind($socket, '127.0.0.1', 1223)) {
    echo 'No se pudo vincular el socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

$rval = socket_get_option($socket, SOL_SOCKET, SO_REUSEADDR);

if ($rval === false) {
    echo 'No se pudo obtener la opción del option: '. socket_strerror(socket_last_error()) . PHP_EOL;
} else if ($rval !== 0) {
    echo 'SO_REUSEADDR está establecido en el socket !' . PHP_EOL;
}
?>

Ver también

socket_create() - Crear un socket (extremo de comunicación)
socket_bind() - Vincula un nombre a un socket
socket_strerror() - Devuelve una cadena que describe un error de socket
socket_last_error() - Devuelve el último error sobre un socket
socket_get_option() - Obtiene las opciones de socket para el socket

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User Contributed Notes 8 notes

down

drenintell ¶

19 years ago

To expand a bit more on what "tim at e2-media dot co dot nz" started.

SO_SNDTIMEO is one of the many constants you can use with socket_set_option.

See http://ca.php.net/manual/en/ref.sockets.php for the available Predefind Constants and visit http://man.he.net/man2/setsockopt for the meaning of the ones relevant.

Tim's example might seem at first a bit non-intuitive since he is using the SO_SNDTIMEO constant. Which means, if the socket has to send out data, it must do it within the limit specified - in his case 10 seconds. Usually you won't set a timeout for sending out data. Nevertheless, the example is valid, and there are situations where you need to do so.

A more intuitive use of socket_set_option would be to set a time out for a blocking socket (a socket that waits for data to be receive when read from). You would do this like so:

socket_set_option($socket,SOL_SOCKET, SO_RCVTIMEO, array("sec"=>0, "usec"=>100));

Notice that sec= 0 and usec= 100; Depending on how long you want your program to wait to recieve data, you might want to change these values.

Regards,
  drenintell

down

aeolianmeson at ifacfchi dot blitzeclipse dot com ¶

16 years ago

Lingering will sometimes not work when you're working with non-blocking sockets. Even if the socket is set to linger and you keep tying to close until the socket doesn't return an error and the resource is no longer identifiable as type 'Socket', the socket may STILL close without sending everything.

Therefore, in the event that you are using non-blocking sockets (which is preferable if you care at all about signaling), you should set the socket as blocking (socket_set_block()) before calling to close it. This will allow everything to flush before it returns.

Dustin Oprea

down

gmail user asmqb7 ¶

5 years ago

PLEASE NOTE

PHP 7.3.6, and probably many previous versions, automatically sets SO_REUSEADDR when you use stream_socket_server().

php_network_bind_socket_to_local_addr() is called at https://github.com/php/php-src/blob/623911f993f39ebbe75abe2771fc89faf6b15b9b/main/streams/xp_socket.c#L675 and defined at https://github.com/php/php-src/blob/61a6a6ec51297506c54f3c6e60ace9b892d0a3e4/main/network.c#L401 and if you take a look you'll see

#ifdef SO_REUSEADDR
            setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&sockoptval, sizeof(sockoptval));
#endif

I initially thought I'd need to play with context options to turn this on, but no, the simplest single-arg call with no error checking and just an address, works for me.

strace your PHP binary to be 100% sure:

...
setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
...

The chances are you ARE using SO_REUSEADDR unless you're using a 100-year old UNIX clone in a month with a Z in it.

down

renmengyang567 at gmail dot com ¶

5 years ago

<question>
 Why is the size of the buffer 2 times that set by me?
<?php
//Before setting the cache area
$sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
socket_bind($sock, '127.0.0.1',5000);
socket_listen($sock,1024);
$sndbuf = socket_get_option($sock,SOL_SOCKET,SO_SNDBUF);
$rcvbuf = socket_get_option($sock,SOL_SOCKET,SO_RCVBUF);
printf("send buffer size(写缓存区大小):%sm \n",$sndbuf/1024);
printf("receive buffer(读缓存区大小)%sm \n",$rcvbuf/1024);

//After setting the cache area
$snd_buf = 1024*3;
$rcv_buf = 1024*3;

socket_set_option($sock,SOL_SOCKET,SO_SNDBUF, $snd_buf);
socket_set_option($sock,SOL_SOCKET,SO_RCVBUF, $rcv_buf);
$sndbuf = socket_get_option($sock,SOL_SOCKET,SO_SNDBUF);
$rcvbuf = socket_get_option($sock,SOL_SOCKET,SO_RCVBUF);

printf("send buffer size(写缓存区大小):%sm \n",$sndbuf/1024);
printf("receive buffer size(读缓存区大小)%sm \n",$rcvbuf/1024);
?>

down

ludvig dot ericson at gmail dot com ¶

18 years ago

I would like to comment on the previous note regarding blocking sockets.
There is more to blocking sockets than waiting for data to be received when trying to be read upon, just to make example, a listening blocking socket will wait for a client to try to connect before it returns when you socket_accept() it.

down

tim at e2-media dot co dot nz ¶

20 years ago

To set a socket timeout value (assuming you've set it blocking) use:

socket_set_option(
  $socket,
  SOL_SOCKET,  // socket level
  SO_SNDTIMEO, // timeout option
  array(
    "sec"=>10, // Timeout in seconds
    "usec"=>0  // I assume timeout in microseconds
    )
  );

down

-2

DaveRandom ¶

14 years ago

Setting the socket timeout microseconds ('usec') does not work under Windows, at least under PHP/5.2.9:

<?php

  $timeout = array('sec'=>1,'usec'=>500000);
  socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,$timeout);
  var_dump(socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO));

?>

Output on Windows box:

array(2) {
  ["sec"]=>
  int(1)
  ["usec"]=>
  int(0)
}

Output on Linux box:

array(2) {
  ["sec"]=>
  int(1)
  ["usec"]=>
  int(500000)
}

down

-5

ckozler at kozler dot net ¶

12 years ago

It appears that Winsock does not acknowledge timeout (send and receive) on Windows.

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