Example of how to manipulate UNIX signals in C

signal.c

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

#define SIGTERM 15
#define SIGKILL 9
#define SIGINT 2

void signal_handler(int signal)
{
    printf("Caugth signal %d\t", signal);

    if (signal == SIGTERM)
        printf("SIGTERM\n");
    else if (signal == SIGKILL)
        printf("SIGKILL\n");
    else if (signal == SIGINT)
        printf("SIGINT\n");
}

int main ()
{
    signal(SIGTERM, signal_handler);
    signal(SIGKILL, signal_handler);
    signal(SIGINT, signal_handler);

    while (1);
}