Problems with sockets under linux

This is a discussion on Problems with sockets under linux within the Linux Programming forums, part of the Platform Specific Boards category; I've been screwing around with Sockets programming for a little while - just to see what it's like. Code: #include ...

  1. #1
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    Problems with sockets under linux

    I've been screwing around with Sockets programming for a little while - just to see what it's like.

    Code:
    #include "../unp.h"
    #include <time.h>
    
    int main(int argc, char **argv)
    {
            int     listenfd, connfd;
            struct sockaddr_in servaddr;
            char    buff[MAXLINE];
            time_t  ticks;
    
            listenfd = Socket(AF_INET, SOCK_STREAM, 0);
    
            bzero(&servaddr, sizeof(servaddr));
            servaddr.sin_family = AF_INET; bzero(&servaddr, sizeof(servaddr));
            servaddr.sin_family = AF_INET;
            servaddr.sin_addr.s_addr = hton1(INADDR_ANY);
            servaddr.sin_port = htons(13);
    
            Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
    
            Listen(listenfd, LISTENQ);
    
            for (;;)
            {
                    connfd = Accept (listenfd, (SA *) NULL, NULL);
    
                    ticks = time(NULL);
                    snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
                    Write(connfd, buff, strlen(buff));
    
                    Close(connfd);
            }
    }
    That's the code i'm using for a simple daytime server. Here are the errors that I'm getting:
    fatality Server # gcc server.c -o server
    In file included from server.c:1:
    ../unp.h:7:75: config.h: No such file or directory
    In file included from server.c:1:
    ../unp.h:115: error: redefinition of `struct in_pktinfo'
    ../unp.h:202:36: ../lib/addrinfo.h: No such file or directory
    ../unp.h:216: error: redefinition of `struct timespec'
    ../unp.h:296: error: conflicting types for `gai_strerror'
    /usr/include/netdb.h:639: error: previous declaration of `gai_strerror'
    ../unp.h:301: error: conflicting types for `getnameinfo'
    /usr/include/netdb.h:648: error: previous declaration of `getnameinfo'
    ../unp.h:305: error: conflicting types for `gethostname'
    /usr/include/unistd.h:783: error: previous declaration of `gethostname'
    ../unp.h:325: error: conflicting types for `inet_aton'
    /usr/include/arpa/inet.h:74: error: previous declaration of `inet_aton'
    Last edited by principii; 09-17-2004 at 03:23 PM. Reason: editing topic - said it wrong

  2. #2
    Registered User linuxdude's Avatar
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    Something is wrong withy your headers, your ../unp.h is including files that don't exist. You are also somewhere including a header that trying to define functions already included. Check your headers.

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    or, only include what's needed... check man or your book (i'm assuming unix net prog)

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    scrappy - I downloaded the source code for all of the programs included with unix net prog, and took unp.h from it (i didn't want to type it up myself), stuck it in a directory with subdirectories Server and Client each containing the two programs specified in chapter one of unix net prog.

  5. #5
    Crazy Fool Perspective's Avatar
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    In file included from server.c:1:
    ../unp.h:7:75: config.h: No such file or directory
    so where is config.h?

    if you want to learn socket prgramming i suggest taking a look at Beej's Guide . Its more or less the bible of learning socket programmming under unix.

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    I figured it out. I had to use autoconf.

  7. #7
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    Quote Originally Posted by principii View Post
    I figured it out. I had to use autoconf.
    can you plz explain how to use autoconf?

  8. #8
    and the hat of wrongness Salem's Avatar
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    Yes, you can read the manual page and the forum rules.

    One in particular is not bumping long dead threads.

    Another is to show that you at least tried to RTFM
    How To Ask Questions The Smart Way
    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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