Thread: C Server

  1. #1
    Registered User
    Join Date
    Apr 2010

    C Server

    I want to try to make a C server that allows multiple clients to connect and talk back and forth with the server, but I have no clue where to get started. I know the basics of what I have to do (set up sockets, wait for a connection, and use the socket to read/write), but the specifics is beyond me. How do I do this?

  2. #2
    Registered User
    Join Date
    Oct 2008
    Plenty of stuff here and on Google detailing howto go about it.

  3. #3
    Registered User
    Join Date
    Apr 2010
    I found this starter code but I'm not sure how to change it so that a) it accepts more than 1 client and b) gets rid of all the errors I get when I try to compile it.

    #include <stdio.h>
    #include <sys/socket.h> 
    #include <arpa/inet.h> 
    #include <stdlib.h>     
    #include <string.h>    
    #include <unistd.h>    
    #include <fcntl.h>     
    #include <sys/file.h>   
    #include <signal.h>     
    #include <errno.h>     
    #include <time.h>
    int main(){
    int soc, ns, k;
    int on = 1, status;
    char buf[256];
    struct sockaddr_in peer; /* Used to talk to a client */
    struct sockaddr_in self; /* Used to contain info about self (for bind.) */
    int peer_len = sizeof(peer);
    char *host;
    /* fill in own sockaddr_in structure */
    self.sin_family = AF_INET;
    self.sin_port = htons(PORT);
    self.sin_addr.s_addr = INADDR_ANY;
    bzero(&(self.sin_zero), 8);
    peer.sin_family = AF_INET; /* fill in (as much as necessary) potential client info */
    soc = socket(AF_INET, SOCK_STREAM, 0); /* get a listening socket "soc" */
    /* tell the OS to connect the socket id "soc" and the sockaddr_in struct "self" */
    bind(soc, (struct sockaddr *)&self, sizeof(self))
    listen(soc, 1); /* tell the OS we are ready (accepting one call only) */
    ns = accept(soc, (struct sockaddr *)&peer, &peer_len); /* wait for a connection */
    k = read(ns, buf, sizeof(buf)); /* read from client on connected socket ns */
    write(ns, buf, k); /* write back the same string to client: */
    close(ns); /* clean up and exit */

  4. #4
    Registered User
    Join Date
    Jan 2009
    I don't think you'll be very successful by just trying to change other people's source.

    Beej's Guide To Networking is a very good resource to learn network programming.

    Beej's Guide to Network Programming

    (It says buy as a book at the top, but there is a downloadable version further down the page)

    It covers pretty much everything you need to know about networking and is easy to understand. Not really that long either.

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