lib/52063: halfdelay() does not honour timeout value

[Onno van der Linden <o.vd.linden%quicknet.nl@localhost>]

>Number:         52063
>Category:       lib
>Synopsis:       timeout value in halfdelay() not honoured
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 11 12:20:00 +0000 2017
>Originator:     Onno van der Linden
>Release:        NetBSD 7.99.65
>Organization:

>Environment:
System: NetBSD sheep 7.99.65 NetBSD 7.99.65 (SHEEPKMS) #1: Mon Mar 6 17:11:40 CET 2017 onno@sheep:/sys/arch/i386/compile/SHEEPKMS i386
Architecture: i386
Machine: i386
>Description:
halfdelay() in the curses library has a timeout value in
tenths of seconds that does not seem to be honoured.
pkgsrc/x11/xrestop uses it and it doesn't refresh the
screen with new info but waits for input instead.
>How-To-Repeat:
#include <curses.h>
#include <stdio.h>

main()
{
        int     c;

        initscr();

        halfdelay(20);
        c = wgetch(stdscr);
        fprintf(stderr,"c = %d\n",c);
}

This should quit after 2 seconds and print c = -1.
>Fix:
No idea yet.