socket_set_nonblock()
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Sets nonblocking mode for file descriptor fd
说明
socket_set_nonblock(resource $socket): bool
The socket_set_nonblock() function sets the O_NONBLOCK
flag on the socket specified by the$socketparameter.
When an operation(e.g. receive, send, connect, accept,...)is performed on a non-blocking socket, the script will not pause its execution until it receives a signal or it can perform the operation. Rather, if the operation would result in a block, the called function will fail.
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
socket_set_nonblock() example
<?php $socket = socket_create_listen(1223); socket_set_nonblock($socket); socket_accept($socket); ?>
This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_NONBLOCK
mode.socket_accept() will immediately fail unless there is a pending connection exactly at this moment.
参见
socket_set_block()
Sets blocking mode on a socket resourcesocket_set_option()
Sets socket options for the socketstream_set_blocking()
为资源流设置阻塞或者阻塞模式
Beware, when using this function within a loop (i.e. a demon with a socket). The socket_accept(), for example, emits a warning each time there is no incoming connection available to be read. My php error log file got huge in a matter of seconds, eventually crashing the server. Of course, i used the @ before the function to take care of that problem. [EDITOR: One can (and should) use socket_select to detect a new connection on a socket (it's a "readable" event)]