Clarification - Setting socket options at the same time when socket is listening Post: 302515051

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Special Forums IP Networking Clarification - Setting socket options at the same time when socket is listening Post 302515051 by jake24 on Monday 18th of April 2011 11:28:57 PM

04-19-2011

Registered User

Clarification - Setting socket options at the same time when socket is listening

I need clarification on whether it is okay to set socket options on a listening socket
simultaneously when it is being used in an accept() call?

Following is the scenario:-

-- Task 1 - is executing in a loop - polling a listen socket, lets call it 'fd', (whose file descriptor is global) for an incoming connection request with select() and then executing accept(fd,...) when a connection request arrives.
-- Task 2 - is a task that receives config commands from console and manipulates internal structures in response to them. As part of a particular command, it sets an option on the same listen socket using setsockopt(fd,....)

The option must be set on the listen socket fd ONLY when intimated to do so via a console command.

Can someone please clarify if it is okay to perform setsockopt on a socket when the same is being used in a simultaneous accept() call in another task?

jake24

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LEARN ABOUT PHP

socket_create_listen

SOCKET_CREATE_LISTEN(3) 						 1						   SOCKET_CREATE_LISTEN(3)

socket_create_listen - Opens a socket on port to accept connections

SYNOPSIS

       resource socket_create_listen (int  $port, [int	$backlog = 128])

DESCRIPTION

       socket_create_listen(3)	creates  a new socket resource of type AF_INET listening on all local interfaces on the given port waiting for new
       connections.

	This function is meant to ease the task of creating a new socket which only listens to accept new connections.

PARAMETERS

	      o $port
		- The port on which to listen on all interfaces.

	      o $backlog
		- The $backlog parameter defines the maximum length the queue of pending connections may grow to.   SOMAXCONN  may  be	passed	as
		$backlog parameter, see socket_listen(3) for more information.

RETURN VALUES

       socket_create_listen(3)	 returns  a  new  socket  resource  on	success  or  FALSE  on	error.	The  error  code  can  be  retrieved  with
       socket_last_error(3). This code may be passed to socket_strerror(3) to get a textual explanation of the error.

NOTES

       Note

	       If you want to create a socket which only listens on a certain interface you  need  to  use  socket_create(3),  socket_bind(3)  and
	      socket_listen(3).

SEE ALSO

       socket_create(3), socket_create_pair(3), socket_bind(3), socket_listen(3), socket_last_error(3), socket_strerror(3).

PHP Documentation Group 												   SOCKET_CREATE_LISTEN(3)

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