/*
    Author: Kasper Laudrup <laudrup@stacktrace.dk>
    This code is in the public domain.
    From patch from bko 214908
*/
#include <signal.h>
#include <stdio.h>
#include <string.h>

int signals[] = {SIGSTOP, SIGCONT, SIGHUP, SIGINT, SIGTERM, SIGKILL, SIGUSR1, SIGUSR2};

print_signal_name(int signal)
{
    char *signame;
    switch (signal) {
    case SIGSTOP:
        signame = "SIGSTOP";
        break;
    case SIGCONT:
        signame = "SIGCONT";
        break;
    case SIGHUP:
        signame = "SIGHUP";
        break;
    case SIGINT:
        signame = "SIGINT";
        break;
    case SIGTERM:
        signame = "SIGTERM";
        break;
    case SIGKILL:
        signame = "SIGKILL";
        break;
    case SIGUSR1:
        signame = "SIGUSR1";
        break;
    case SIGUSR2:
        signame = "SIGUSR1";
        break;
    default:
        signame = "UNKNOWN";
        break;
    }
    printf("Caught signal: %s\n", signame);
}

void handler(int signal)
{
}

int main(int argc, char *argv[])
{
    sigset_t waitset;
    struct sigaction sigact;
    int signal, result, i;
    int signals_size = sizeof(signals) / sizeof(int);

    sigemptyset(&sigact.sa_mask);
    sigemptyset(&waitset);
    sigact.sa_flags = 0;
    sigact.sa_handler = handler;
    for (i = 0; i < signals_size; i++) {
        sigaction(signals[i], &sigact, NULL);
        sigaddset(&waitset, signals[i]);
    }

    printf("Waiting for signal\n");
    result = sigwait(&waitset, &signal);
    if (result == 0) {
        print_signal_name(signal);
        return 0;
    } else {
        char *error = strerror(result);
        printf("Error calling sigwait: %s\n", error);
        return 1;
    }
}