socket_set_block

(PHP 4 >= 4.2.0, PHP 5)

socket_set_block — Sets blocking mode on a socket resource

说明

bool socket_set_block ( resource $socket )

The socket_set_block() function removes the O_NONBLOCK flag on the socket specified by the socket parameter.

When an operation (e.g. receive, send, connect, accept, ...) is performed on a blocking socket, the script will pause its execution until it receives a signal or it can perform the operation.

参数

socket: A valid socket resource created with socket_create() or socket_accept() .

返回值

成功时返回 TRUE ，或者在失败时返回 FALSE 。

范例

Example #1 socket_set_block() example

  <?php
$socket  =  socket_create_listen ( 1223 );
 socket_set_block ( $socket );

 socket_accept ( $socket );
 ?>

This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_BLOCK mode. socket_accept() will hang until there is a connection to accept.

参见

socket_set_nonblock() - Sets nonblocking mode for file descriptor fd
socket_set_option() - Sets socket options for the socket

用户评论:

[#1] laacz at laacz dot lv [2014-12-04 20:43:09]

Besides true and false socket_set_block might return NULL if you're not too careful. That would happen when passing non socket resource as first parameter.

E.g. socket_set_block(false)) would return NULL and emit warning that you're trying to do things with non-socket.