Why do I receive Program received signal SIGABRT, Aborted? Post: 302634569

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Top Forums Programming Why do I receive Program received signal SIGABRT, Aborted? Post 302634569 by neutronscott on Thursday 3rd of May 2012 03:50:45 PM

05-03-2012

Registered User

During lunch I grabbed your code and it compiled cleanly. accept() didn't work (on Linux) because intlen wasn't initalized to sizeof(struct inaddr_in).

The way you have keepsake temporarily hold onto the head of the list and iterate using descr_list is odd. So I changed descr_list to be descr_head. It always is the head of the list (Then no need wasting struct space on a list pointer in each and every descr). Then iterate with:

Code:

struct descr *d;
for (d = descr_head; d; d = d->next)

Removed some dead code and it worked.

I think somehow you're getting descr_list to be NULL and trying to reference descr_list->next. Not sure, might look later at the original code but it was easier this way for me.

---------- Post updated at 03:50 PM ---------- Previous update was at 01:35 PM ----------

I looked again at fixing your implimentation and couldn't. I can't wrap my head around where descr_list may be at any given moment since it's a global and changed in a function (initalize_descr) called from main().... here's snipplets of my changes

Code:

int initialize_descr(int newfd, struct descr **p)
{
    struct descr *d;
    if(!(d = malloc(sizeof(struct descr))))
    {
        nonfatal("malloc failure initializing descr");
        return 0;
    }
    d->newfd = newfd;
    d->state = CHARACTER_LOGIN;
    d->next = NULL;
    *p = d;
    if(descr_head == NULL)
    {
        descr_head = d;
    }
    else
    {
        for (d = descr_head; d->next; d = d->next)
                ;
        d->next = *p;
    }
    return 1;
}
int main()
{
    socklen_t inclen = sizeof(struct sockaddr_in);
    for(;;)
    {
        struct descr *d, *prev;
        /* END if (heart_pulse == 15000) */
        prev = NULL;
        d = descr_head;
        while (d != NULL)
        {
            if(FD_ISSET(d->newfd, &read_fds))
            {
                if(d->state == CHARACTER_LOGIN)      /* Character login    */
                {
                    character_login(d);
                }
                else if(d->state == CREATE_CHARACTER)  /* Character creation */
                {
                    create_character(d);
                }
                if(d->state == SAY_GOODBY)
                {
                struct descr *next = d->next;
                    close(d->newfd);
                    FD_CLR(d->newfd, &master);
                    if (d == descr_head)
                        descr_head = next;
                    else
                        prev->next = next;
                    free(d);
                    d = next;
                    continue;
                }
            }
            d = d->next;
            prev = d;
        }
    }/* END for(;;) */
    close(simpleSocket);
    exit(EXIT_SUCCESS);
}

Last edited by neutronscott; 05-03-2012 at 05:15 PM.. Reason: better loop

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LEARN ABOUT DEBIAN

bosskill

BOSSKILL(8)						      System Manager's Manual						       BOSSKILL(8)

NAME

       bosskill - send a signal to your boss, or terminate your boss

SYNOPSIS

       bosskill [ -signal ] <bossname>

DESCRIPTION

       bosskill  sends	the  TERM  (terminate,	15) signal to the boss with the specified bossname.  If a signal name or number preceded by `-' is
       given as the first argument, that signal is sent instead of terminate. The killed boss must be in the  system  administrator's  supervisory
       chain.

       The following is a list of all signals with names as in the include file <signal.h>:

       SIGHUP	 1     hangup.	Forces	bossname  to re-read his/her job description and figure out that he/she knows squat about sysadmin work or
		      life, in general.

       SIGINT	 2    interrupt. Prevents the bossname from interrupting the sysadmin for one hour.

       SIGQUIT	 3    quit. Causes the boss to quit his/her job with no explanation.

       SIGILL	 4    illegal instruction. Makes the boss believe the last instruction he/she gave was illegal, so he/she withdraws it.

       SIGTRAP	 5    trace trap. Display the exact location of the boss.

       SIGABRT	 6    abort. Makes the boss go home and try again tomorrow.

       SIGKILL	 9    kill. Game over.

       SIGBUS	 10   bus error. Boss's transportation fails on the way to work.

       SIGSEGV	 11   segmentation violation. Boss realizes he/she is trying to do something for which he/she is not quailified and stops.

       SIGSYS	 12   bad argument. Boss loses.

       SIGPIPE	 13   smoke pipe. Boss samples some green leafy substance and mellows out.

       SIGALRM	 14   alarm. Boss is startled and falls over. Best used when boss is walking next to his/her boss.

       SIGTERM	 15   termination signal. Boss is fired.

BUGS

       Sending a SIGABRT to a boss that is already home will cause him/her to walk aimlessly in circles for two hours.

HISTORY

       Written by Eric L. Pederson <eric@bofh.org.uk>.

								 27 September 1995						       BOSSKILL(8)