Newsgroup: comp.unix.programmer

DaVinci wrote:
> Diomidis Spinellis wrote:
>> DaVinci wrote:
>>> I am writing a ncurses game,ping-pong,
>>> void _pause()
>>> //when the user press 'p',the game will pause
>>> {
>>>      //??how to implement?
>>> }
>> Simply enter a state where you read and discard characters, until you
>> get an EOF or a 'p'.
> 
> #include <signal.h>
> #include <unistd.h>
> #include <iostream>
> void sig_cont(int signo)
> {
> 	std::cout<<"sig_cont ()"<<std::endl;
> 	return ;
> }
> 
> int main()
> {
> 	signal(SIGCONT,sig_cont);
> 	char ch;
> 	while(1)
> 	{
> 		signal(SIGCONT,sig_cont);
> 		ch = getchar();
> 		if(ch == 'p')
> 		{
> 			pause();
> 		}
> 		else if(ch == 'c')
> 		{
> 			kill(getpid(),SIGCONT);
> 			std::cout<<"send signal SIGCONT"<<std::endl;
> 		}
> 		else
> 		{
> 		 	std::cout<<"hello world"<<std::endl;
> 		}
> 	}
> 
> }
> when I programme had paused ,how can I wake up it? how can I make it
> continue to run?
> 

Don't pause the program with SIGTSTP, because then only another external 
process can send you a SIGCONT.

-- 
Diomidis Spinellis
Code Quality: The Open Source Perspective (Addison-Wesley 2006)
http://www.spinellis.gr/codequality

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