Re: Gtkmm and fork()

[MK <halfcountplus intergate com>]

Chris Vine wrote:
>This won't work.  X won't allow two processes to share the same
>resources.
>If you are fork()ing to exec() another program, then you will need to
>start a new thread and fork() from that 

You don't have to thread it.  I presume the purpose has nothing to do
with gtk.  So you might as well quit() gtk immediately in the fork.
After that you can do whatever you want.

#include <gtkmm.h>
#include <iostream>

using namespace std;

vector<pid_t> Pids;

void buttonpress() {
	static int i = 0;
	i++;
	pid_t pid = fork();
	cerr << i<< ": " << pid <<endl;
	if (!pid) {
		Gtk::Main::quit();
		while (1) {
			sleep(1);
			cerr << i << " hello world" << endl;
		}
	} else Pids.push_back(pid);
}

int main(int argc, char *argv[]) {
	Gtk::Main kit(argc, argv);
	Gtk::Window win;
	Gtk::VBox box;
	Gtk::Button but("click me");

	win.set_title("gtkmm test");
	win.set_size_request(400,200);
	win.add(box);

	box.pack_start(but);
	but.signal_clicked().connect(
		sigc::ptr_fun(buttonpress),false);

	win.show_all();
	kit.run(win);

	vector<pid_t>::iterator it = Pids.begin(), 
		end =  Pids.end();
	while(it != end) kill(*(it++),9);

	return 0;
}                         

-- 
MK <halfcountplus intergate com>