Fwd: Bsd sockets and GCC 4.0

19 May 2005

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I guess this was intended for the list.

Begin forwarded message:
From: Ryan Lum <cow@launchpc.com>
Date: 17 mei 2005 00:52:20 GMT+02:00
To: Jonas Maebe <jonas@zeus.ugent.be>
Subject: Re: Bsd sockets and GCC 4.0
On 5/16/05 4:47 PM, "Jonas Maebe" <jonas@zeus.ugent.be> wrote:
I did try a different ver though
int co1800_init_socket(int port)
{
    int s, opt;
    struct sockaddr_in sa;
    struct linger ld;
        char buf[MAX_STRING_LENGTH];

#if defined (DIKU_WINDOWS)
    WORD wVersionRequested;
    WSADATA wsaData;
    wVersionRequested = MAKEWORD(2, 0);
    if (WSAStartup(wVersionRequested, &wsaData) != 0) {
    main_log("SYSERR: WinSock not available!");
    exit(1);
    }
#endif
    GVLOCATION(3130);
    memset(&sa, 0, sizeof(struct sockaddr_in));
#if defined (DIKU_WINDOWS)
    sa.sin_family = PF_INET;
    sa.sin_port = htons((unsigned short)port);
#else
    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
#endif
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
             bzero(buf, sizeof(buf));
             sprintf(buf, "ERROR: opening socket.\r\n");
             perror(buf);
             ABORT_PROGRAM();
    }
            if (ct > time(0)) ct = time(0);
        }
        sprintf (buf, "%d", tempI);
        printf("error %d on socketpair\n", errno);
        main_log(buf);
        main_log ("ERROR: Damn socket errors (comm.c)");
        spec_log("ERROR: Damn socket errors (comm.c)", ERROR_LOG);
        exit(1);
    }
    if (listen(s, 5) < 0) {
        main_log ("ERROR: sigh (comm.c) bug #: 3174517521297519275");
        spec_log("ERROR: sigh (comm.c) bug #: 3174517521297519275",
ERROR_LOG);
        exit(1);
    }
    return(s);
}

Output:
error 48 on socketpair (errno)
Mon May 16 17:46:04 2005 :: -1 (tempI)
Mon May 16 17:46:04 2005 :: ERROR: Damn socket errors (comm.c)

dmdevel has exited with status 1.

On 16 May 2005, at 23:39, Ryan Lum wrote:
if(bind(s, (struct sockaddr *)&sa, sizeof(sa) < 0)) {
With gcc 3.3 no problems, but it is returning -1 with 4.0.  I am no
socket
expert, and any debugging advice would help.

Your code has been wrong for 10 years, it should be
if(bind(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
You were passing 0 as namelen parameter (since sizeof(sa) > 0). Not
sure why this would work with gcc 3 and not with 4 though.

Jonas
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Thanks for all your help, I actually just typoed the code I posted.
Sorry.

Here is the whole function.  I am not interested in the DIKU_WINDOWS
code.

    if ((s = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {

        sprintf (buf, "SYSERR: Error opening network connection:
Winsock

error #%d", WSAGetLastError());

        main_log(buf);

        exit(1);

    }
    opt = 1;

    if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &opt,
sizeof(opt))

< 0) {

        main_log ("ERROR: Socket error (comm.c)");

        spec_log("ERROR: Socket error (comm.c)", ERROR_LOG);

        exit(1);

    }

    ld.l_onoff = 0; /* make sure this is on */

    ld.l_linger = 1000; /* who cares about this */
    if (setsockopt(s, SOL_SOCKET, SO_LINGER, (char *)&ld, sizeof(ld))
<0) {

            main_log ("ERROR: ANother socker error (comm.c)");

            spec_log("ERROR: ANother Socket error (comm.c)",
ERROR_LOG);

        exit(1);

    }
   GVLOCATION(3135);

    int tempI;

    tempI= bind(s, (struct sockaddr *)&sa, sizeof(sa));

    if ( tempI < 0) {

            long ct;

#if defined (DIKU_WINDOWS)

        if (closesocket(s))

#else

        if(close(s))

#endif

          fprintf(stderr, "co1800_init_socket: error closing socket:
%d",

errno);

        ct = time(0); /* since script loops wait around a bit */

        while (time(0)-45 < ct) {
I don't have time right now to read the man bind text or google for the

socketpair error, but I imagine it will probably help fix the error.
Can

anyone recommend a good book that covers bsd sockets.  I imagine I
will have

to actually read about sockets before I figure this out.
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