revive from segmentation fault demo applikacio

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>


#define SIGNAL_HANDLER_REGISTERED_WITH_SIGNAL_FUNCTION  (0)
#define egy_vegtelen_hosszu_hurok                       while(1){;}



















#define bele_eses(mibe)             mibe


















int b_try_again;





















void signal_handler(int signal_num)
{
    printf("szegmentacios hiba\n");

    if(b_try_again)
    {
#if SIGNAL_HANDLER_REGISTERED_WITH_SIGNAL_FUNCTION

        sigset_t sigs;
        sigprocmask(0, 0, &sigs);
        sigdelset(&sigs, signal_num);
        sigprocmask(SIG_SETMASK, &sigs, 0);

#endif

        execv("./segmentation_fault", (char *[]){ ".", "-s_revive", NULL });
    }

    printf("exit\n");

    exit(EXIT_SUCCESS);
}

void krezia(void)
{
    pid_t pid;

    pid = fork();

    if(pid >= 0)
    {
        execv("./segmentation_fault", (char *[]){ ".", "-s", NULL });
    }

    printf("zamao\n");
}

void krezib(void)
{
    execv("./segmentation_fault", (char *[]){ ".", "-s", NULL });

    printf("zambo\n");
}


void funkcio(char *vla)
{
    *vla = 10;
}

void random_funkcio(void *k)
{
    execv("./segmentation_fault", (char **)k);
}
























int main(int argc, char* argv[])
{
    char kenyer;

#if SIGNAL_HANDLER_REGISTERED_WITH_SIGNAL_FUNCTION

    signal(SIGSEGV, signal_handler);

#else

    struct sigaction act;
    memset(&act.sa_mask, 0, sizeof(act.sa_mask));
    act.sa_handler = signal_handler;
    act.sa_flags = SA_NODEFER;
    sigaction(SIGSEGV, &act, 0);

#endif



    printf("ferfi oldal (man page)\n");

    if(argc > 1)
    {
        if(strcmp(argv[1], "-s") == 0)
        {
            funkcio(0);
        }
        else if(strcmp(argv[1], "-ra") == 0)
        {
            krezia();
        }
        else if(strcmp(argv[1], "-rb") == 0)
        {
            krezib();
        }
        else if(strcmp(argv[1], "-s_revive") == 0)
        {
            b_try_again = 1;

            funkcio(0);
        }
        else
        {
            funkcio(&kenyer);

            bele_eses(egy_vegtelen_hosszu_hurok);
        }
    }

    printf("exit main\n");

    exit(EXIT_SUCCESS);
}