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(PHP 4 >= 4.2.0, PHP 5)
socket_set_block — Sets blocking mode on a socket 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.
socket
A valid socket resource created with socket_create() or socket_accept() .
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
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.
[#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.