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

static int globalValue;

void
my_INT_handler(int i, siginfo_t *si, void *uc)
{
    ++globalValue;
}

int
main(int argc, char **argv)
{
    struct sigaction sa;

    memset(&sa, 0, sizeof(sigaction));
    sa.sa_sigaction = &my_INT_handler;
    sa.sa_flags = SA_SIGINFO;
    sigaction(SIGINT, &sa, NULL);

    globalValue = 0;
    while(1)
    {
        sleep(2);
        printf("Value: %i\n", globalValue);
    }

    return(0);
}

#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/ptrace.h>
#include <linux/ptrace.h>

int
main(int argc, char **argv)
{
    int traced_process = atoi(argv[1]);

    ptrace(PTRACE_ATTACH, traced_process, NULL, NULL);
    while(1)
    {
        siginfo_t si;

        memset(&si, 0, sizeof(siginfo_t));
        wait(NULL);
        printf("Received signal from child\n");
        ptrace(PTRACE_GETSIGINFO, traced_process, NULL, &si);
        printf("signo: %i errno: %i code: %i\n", si.si_signo, si.si_errno,
            si.si_code);
        ptrace(PTRACE_SETSIGINFO, traced_process, NULL, &si);

        ptrace(PTRACE_CONT, traced_process, NULL, NULL);
    }

    return(0);
}