Re: Full-duplex communication

What i'm trying to leverage on is the socket that is left open. Since it is left open, i can write() to it, not from a php script necessarily, but another application. And since it is a custom client, i can have complete control over it. Developing a multi-threaded or listening server using php is not something that i'm interested in. I was looking for a way where i could get the open socket from apache so that i could just write to it. And i know that a web server cannot respond without a request. I'm talking abt another application getting hold of the socket and sending data to the client that is read()ing from the socket at the other end. This is how a percieved full-duplex connection would be established using just one socket - the client can send in new requests over the connection which apache can hand off to php scripts to process, and the other application can use the socket to send asynchronous data to the client utilizing the fact that the connection is still open. All i'm asking for is a way to get the socket from apache. I know that there are no php functions to retrieve the socket on which apache is writing to the client, but want to know how it can be done. I'm not averse to writing some C code to get it done. Tx, Vinod. On Thu, 23 May 2002 Dave Mertens wrote :

On Thu, May 23, 2002 at 09:56:22AM -0000, Vinod Panicker wrote: But what i want is the socket which is used by Apache to send data to the client, which is on a keep-alive connection, so that some other program, or a php script can send data asynchronously to the client. mind you, the client is a custom developed COM component, not a browser. First, When a request is processed the processing-part of apache (or other webservers) are shutdown. Apache can only keep a connection open when a script doesn't reach the end. The client (can be telnet, a custom app or even a browser) request a resource from the server. The server response on this to send data to the client. When the data is send, the request is done and the webserver goes back into listening mode, but the connection isn't closed.. A web-server can never start a asynchroon connection with the client. HTTP is never meant for 2-way communication. It's a simple request-response system. I believe that since php 4.2 php has a true socket interface. And properbly you can use the bind/accept procedures to create a php server. With pcntl you can fork the process. Because you now have full control over the socket, you can also send asynchroon data over the socket. In fact you have written you're own server.. I only don't know if php-sockets can handle multiple connections. If not, use can always create an socket-array, and assign the socket-resource to a free socket in the socket-array. But this is more the Visual Basic way.. -- With best regards, Dave Mertens, Development Manager dmertens@ism.nl Innovative Solutions in Media BV Schiekade 101 3033 BG Rotterdam, Netherlands Tel. +31-10-2436060 Fax. +31-10-2436066

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