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 OSF1

pthread_kill

pthread_kill(3) 					     Library Functions Manual						   pthread_kill(3)

NAME

       pthread_kill - Delivers a signal to a specified thread. (This routine is available only on a UNIX system.)

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h> #include <signal.h>

       int   pthread_kill(
			   pthread_t   thread,
			   int	       sig);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS

       Thread to receive a signal request.  A signal request.

DESCRIPTION

       This  routine sends a signal to the specified target thread thread.  Any signal defined to stop, continue, or terminate will stop or termi-
       nate the process, even though it can be handled by the thread.  For example, SIGTERM terminates all threads in the process, even though	it
       can be handled by the target thread.

       Specifying a sig argument of zero (0) causes this routine to validate the thread argument but not to deliver any signal.

       The name of the "kill" routine is sometimes misleading, because many signals do not terminate a thread.

       The  various  signals  are  as follows: SIGHUP, SIGPIPE, SIGTTIN SIGINT, SIGALRM, SIGTTOU SIGQUIT, SIGTERM, SIGIO SIGTRAP, SIGUSR1, SIGXCPU
       SIGABRT, SIGSYS, SIGXFSZ SIGEMT, SIGURG, SIGVTALRM SIGFPE, SIGSTOP, SIGPROF SIGKILL, SIGTSTP, SIGINFO  SIGBUS,  SIGCONT,  SIGUSR1  SIGSEGV,
       SIGCHLD, SIGUSR2

       If this routine does not execute successfully, no signal is sent.

RETURN VALUES

       If  an  error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are as follows:
       Successful completion.  The value of sig is invalid or unsupported signal value.  The value of thread does not specify an existing thread.

ERRORS

       None

RELATED INFORMATION

       Manuals: Guide to DECthreads and Programmer's Guide

       delim off

																   pthread_kill(3)