Unable to use CTRL-C, 'n' and 'q' keyboard commands in Cygwin and Msys2 shells

[johnoel]

No description provided.

[iantaylor-NOAA]

This block of code seems to only be implemented for Microsoft Visual C, but I don't know the history of that:

admb/src/linad99/newfmin.cpp

Lines 62 to 86 in 2044772

	#ifdef _MSC_VER
	BOOL CtrlHandler(DWORD fdwCtrlType)
	{
	if (fdwCtrlType == CTRL_C_EVENT)
	{
	//Should exit if CTRL_C_EVENT occurs again.
	if (ctlc_flag) ad_exit(1);
	ctlc_flag = 1;
	if (ad_printf)
	(*ad_printf)("\npress q to quit or c to invoke derivative checker: ");
	return true;
	}
	return false;
	}
	#else
	extern "C" void onintr(int k)
	{
	signal(SIGINT, exit_handler);
	ctlc_flag = 1;
	if (ad_printf)
	(*ad_printf)("\npress q to quit or c to invoke derivative checker"
	" or s to stop optimizing: ");
	}
	#endif

[johnoel]

Yes, it should be defined for Windows.

[johnoel]

If you are using cygwin or msys2 shell, it uses mintty in the terminal which
does not correctly pass ctrl-c to the executable.

To workaround it, prefix winpty to run the program.

ie

$ winpty ./n2mvol.exe

Ctrl-C should now work.

The other alternative is to run the program using the stock Windows Command Prompt.

There is no solution for fixing this within admb, it is an issue with the shell.

mintty/mintty#684