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POwhy we cannot accept() a socket on some process and recv() data from its child?
 

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  1. POwhy we cannot accept() a socket on some process and recv() data from its child?
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    <p>I'm trying to implement a simple web server on Linux that connects to the client (the browser) ,receives some requests from the client (e.g GET), and then sends back the response with desired file. I am using a socket communication. I want to create a pool of worker processes (children) at server startup whose job is to deal with the incoming requests. The parent process has to <code>accept()</code> the incoming request and sends their file-desciptor to one of the worker processes to deal with it and sends the response to the client with the requested file.</p> <p>The problem that I have faced is that when I <code>accept()</code> the request and send it to the worker process, <code>recv()</code> or <code>read()</code> functions return <code>-1</code> which means an error occurs:</p> <blockquote> <p>Socket operation on non-socket</p> </blockquote> <p>But when I try to use <code>recv()</code> or <code>read()</code> functions at the parent process, they work very well and return the number of received bytes.</p> <p>How can I solve this issue?</p> <p><sup> PS: I am using the shared memory to pass the file-desciptor from the parent process to the worker process (the child process), and I am using semaphores to manage which worker process will handle the request</sup></p> <hr> <p><strong>EDIT:</strong></p> <p>Actually, it's a project assignment and one of the specification is to send the file-descriptor via the shared memory. However, can I send a pointer of the file-descriptor?</p>
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    1. COYou may find more information by using the keyword: "Pre forked". [Similar question](http://stackoverflow.com/questions/2305865/file-descriptor-sharing-between-parent-and-pre-forked-children)
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