Linux C catching kill signal for graceful termination

Question

I have a process using sockets, database connections and the likes. It is basically a server process relaying between sensor data and a web interface, and as such it is impo

Answer 1

I sometimes like to get a backtrace on SIGSEGV, the catching part goes like:

#include 
#include 
#include 

void sig_handler(int);

int main() {
    signal(SIGSEGV, sig_handler);
    int *p = NULL;
    return *p;
}

void sig_handler(int sig) {
    switch (sig) {
    case SIGSEGV:
        fprintf(stderr, "give out a backtrace or something...\n");
        abort();
    default:
        fprintf(stderr, "wasn't expecting that!\n");
        abort();
    }
}

You do want to be very careful handling these things, e.g. make sure you can't trigger another signal.