#define _GNU_SOURCE
#include <execinfo.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <unistd.h>
#include <sys/mman.h>

int err=0;

void handler(int sig, siginfo_t *info, void *uncontext ){
//  char buff[104];
//  snprintf(buff,100,"%d signal number: %d, An errno value: %d, Signal value: %d.\n",sig, (*info).si_signo, (*info).si_errno, (*info).si_code);
//  write(2,buff,100);
    err++;
    printf("Error %d\n",err);
}

int main(void) {
    struct sigaction mysig_act;
    mysig_act.sa_flags = SA_SIGINFO;
    mysig_act.sa_sigaction = &handler;
    sigaction(SIGSEGV,&mysig_act,NULL);

    long *addr = mmap(NULL,44,PROT_NONE,MAP_PRIVATE,0,0);

    munmap(addr,44);
    (*addr) = 4;
    return EXIT_SUCCESS;
}