Implementing a server without fork()

This is a discussion on Implementing a server without fork() within the Linux Programming forums, part of the Platform Specific Boards category; I have a school homework that asks me to create a chat server (tcp) without creating new processes. The problem ...

  1. #1
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    Implementing a server without fork()

    I have a school homework that asks me to create a chat server (tcp) without creating new processes.
    The problem is that the server has a console. i need to be able to send the server some input whenever i want... I need to use the select function for the mux of the i/o. the server waits on the select function and i'm not able to read from stdin

    how can i solve this ?

  2. #2
    and the hat of wrongness Salem's Avatar
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    Add stdin (ie, fd 0) to the FD_SET of descriptors you pass to select.

    Then you can wait for interesting things to happen on user input, as well as input from your sockets.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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    recv(0,(char*)cmd,sizeof(cmd),0);

    how can i receive interesting things from stdin... this doesn't work

  4. #4
    and the hat of wrongness Salem's Avatar
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    Well I've no idea how to figure out what "it doesn't work" really means from such a terse problem report and one line of code.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    sorry... i was asking how do i read my input from stdin? do i use the recv function ?

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    and the hat of wrongness Salem's Avatar
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    Use the read() function.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    Quote Originally Posted by spank View Post
    recv(0,(char*)cmd,sizeof(cmd),0);

    how can i receive interesting things from stdin... this doesn't work
    Don't use recv() on a file descriptor, use read().

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    great... thank you! i solved this

  9. #9
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    Quote Originally Posted by spank View Post
    great... thank you! i solved this
    In general, you can use read() instead of recv(), but you cannot use recv() instead of read(). read() will read anything, recv() can only read from sockets.

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