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Sets nonblocking mode for file descriptor fd (PHP 4 >= 4.0.7, PHP 5)
bool socket_set_nonblock ( resource socket )

The socket_set_nonblock() function sets 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 non-blocking socket, the script 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.



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

Return Values

Returns TRUE on success or FALSE on failure.


Example 2302. socket_set_nonblock() example

= socket_create_listen(1223);


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.