Method try_stop

src/applib/async_command_executor.cpp:259–279

bool AsyncCommandExecutor::try_stop(hz::Signal sig)
{
	DBG_FUNCTION_ENTER_MSG;
	if (!this->running_ || this->pid_ == 0)
		return false;

	// other variants: SIGHUP(1) (terminal closed), SIGINT(2) (Ctrl-C),
	// SIGKILL(9) (kill).
	// Note that SIGKILL cannot be trapped by any process.

	if (process_signal_send(this->pid_, sig) == 0) {  // success
		this->kill_signal_sent_ = static_cast<int>(sig);  // just the number to compare later.
		return true;  // the rest is done by a handler
	}

	// Possible: EPERM (no permissions), ESRCH (no such process, or zombie)
	push_error(Error<int>("errno", ErrorLevel::Error, errno));

	DBG_FUNCTION_EXIT_MSG;
	return false;
}