Parent.cpp

#include "parent.h"

bool CreateProcesses()
{

#ifdef _MSC_VER

	accessEvent = CreateEventA(NULL, FALSE, TRUE, ACCESS_EVENT);
	char buff[3];
	for (int i = 0; i < PROCESSCOUNT; i++)
	{
		_itoa(i, buff, 10);
		buff[2] = '\0';
		buff[1] = UP_EVENT;
		upEvent[i] = CreateEventA(NULL, FALSE, FALSE, buff);
		buff[1] = DOWN_EVENT;
		downEvent[i] = CreateEventA(NULL, FALSE, FALSE, buff);
		buff[1] = EXIT_EVENT;
		exitEvent[i] = CreateEventA(NULL, FALSE, FALSE, buff);

		ZeroMemory(&si, sizeof(si));
		ZeroMemory(&pi, sizeof(pi));

		if (!CreateProcessA(PATH,
			_itoa(i, buff, 10),
			NULL,
			NULL,
			FALSE,
			0,
			NULL,
			NULL,
			&si[i],
			&pi[i])
			)
		{
			printf("CreateProcess failed (%d).\n", GetLastError());
			system("pause");
			return false;
		}
	}

#else

	struct sigaction act;
	memset(&act, 0, sizeof(act));
	act.sa_handler = synchandler;
	sigset_t set;
	sigemptyset(&set);
	sigaddset(&set, SIGHUP);
	act.sa_mask = set;
	sigaction(SIGHUP, &act, NULL);
	for (int i = 0; i < PROCESSCOUNT; i++)
	{
		pid[i] = fork();
		switch(pid[i]){
		case 0:
		{
			if (!execl(PATH, "", NULL)){
				printf("execl failed ");
				return false;
			}
			break;
		}
		case -1:
		{
			return false;
		}
		default:
		{
			continue;
		}
		}
	}

#endif

	return true;
}

void PrintMenu(){
	cout << "1. level up." << endl;
	cout << "2. level lower." << endl;
	cout << "3. exit." << endl;
	cout << "4. skip." << endl;
}

void ShowMenu()
{

#ifdef _MSC_VER

	DWORD check = WaitForSingleObject(accessEvent, INFINITY);
	if (check == WAIT_OBJECT_0)
	{
		PrintMenu();
		SetEvent(accessEvent);
	}

#else

	PrintMenu();

#endif
}

int ChooseMenu(int &inputNumber)
{
	while (true){
		if (!(cin >> inputNumber))
		{
			cin.clear();
			cin.sync();
		}
		else if (inputNumber < 1 || inputNumber > 4){
			cin.clear();
			cin.sync();
		}
		else {
			return inputNumber;
		}
	}
}

void WaitAndClose()
{

#ifdef _MSC_VER

	for (int i = 0; i < PROCESSCOUNT; i++)
	{
		WaitForSingleObject(pi[i].hProcess, INFINITE);
		CloseHandle(pi[i].hProcess);
		CloseHandle(upEvent[i]);
		CloseHandle(downEvent[i]);
		CloseHandle(exitEvent[i]);

	}
	CloseHandle(accessEvent);

#else

	for (int i = 0; i < PROCESSCOUNT; i++)
	{
		waitpid(pid[i], 0, 0);
	}

#endif
}

int main()
{
	if (!CreateProcesses())
	{
		return 1;
	}

	int inputNumber;

	do {
		ShowMenu();
		ChooseMenu(inputNumber);
		switch (inputNumber)
		{
		case 1: {
			for (int i = 0; i < PROCESSCOUNT; i++)
			{

#ifdef _MSC_VER

				SetEvent(upEvent[i]);

#else

				kill(pid[i], SIGUSR1);

#endif

			}
			break;
		}
		case 2:
		{
			for (int i = 0; i < PROCESSCOUNT; i++)
			{

#ifdef _MSC_VER

				SetEvent(downEvent[i]);

#else

				kill(pid[i], SIGUSR2);

#endif
			}
			break;
		}
		case 3:
		{
			for (int i = 0; i < PROCESSCOUNT; i++)
			{

#ifdef _MSC_VER

				SetEvent(exitEvent[i]);

#else

				kill(pid[i], SIGINT);

#endif
			}
			break;
		}
		default:
		{
			break;
		}
		}
#ifdef _MSC_VER

#else

		if(inputNumber != 3)
		{
			for(int i = 0; i < PROCESSCOUNT; i++) 
			{
				kill(pid[i], SIGHUP);
				fl = true;
				while (fl)
				{
					sleep(1);
				}
			}
		}

#endif

	} while (inputNumber != 3);

	WaitAndClose();
	return 0;
}