/*
This is a personal academic project. Dear PVS-Studio, please check it.
PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#define _POSIX_C_SOURCE 200112L

#include "siglib.h"
#include <signal.h>
#include "error.h"
#include <unistd.h>
#include <stdio.h>

void addSignalHandler(void (*changeViewFlag)()) {
    struct sigaction sigAct = {{0}};
    sigAct.sa_handler = changeViewFlag;
    sigAct.sa_flags = 0;

    if (sigaction(SIGSTART, &sigAct, NULL) == -1)
        printSystemError("sigaction() -- ERROR");
    if (sigaction(SIGEND, &sigAct, NULL) == -1)
        printSystemError("sigaction() -- ERROR");
}

void blockSignal() {
    sigset_t blockedSet = {{0}};
    if (sigemptyset(&blockedSet) < 0)
        printSystemError("sigaction() -- ERROR");
    if (sigaddset(&blockedSet, SIGSTART) < 0)
        printSystemError("sigaddset() -- ERROR");
    if (sigaddset(&blockedSet, SIGEND) < 0)
        printSystemError("sigaddset() -- ERROR");
    if (sigprocmask(SIG_SETMASK, &blockedSet, NULL) < 0)
        printSystemError("sigprocmask() -- ERROR");
}

void waitForSignal() {
    sigset_t set;
    if (sigemptyset(&set) < 0)
        printSystemError("sigemptyset() -- ERROR");
    sigpending(&set);
    if (sigismember(&set, SIGEND)) {
        return;
    }
    if (sigaddset(&set, SIGEND) < 0)
        printSystemError("sigaddset() -- ERROR");
    int temp;
    if (sigwait(&set, &temp) != 0)
        printError("sigwait() -- ERROR");
}

void sendSignal(int pid, int sig) {
    union sigval value = {0};
    if (sigqueue(pid, sig, value) < 0)
        printSystemError("sigqueue() -- ERROR");
}

void sendStartSignal(int pid) {
    sendSignal(pid, SIGSTART);
}

void sendFinishSignal(int pid) {
    sendSignal(pid, SIGEND);
}