Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mcgill-vision!mouse
From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: comp.unix.wizards
Subject: Re: Pty ports and TIOCUCNTL mode
Message-ID: <1077@mcgill-vision.UUCP>
Date: 26 Apr 88 07:17:34 GMT
References: <576@modular.UUCP> <1013@sdcc7.ucsd.EDU>
Distribution: comp
Organization: McGill University, Montreal
Lines: 27

In article <1013@sdcc7.ucsd.EDU>, muller@sdcc7.ucsd.EDU (Keith Muller) writes:
> [explanation of TIOCUCNTL mode]

> #define	JBOOT		_IO(u, 1)
> #define	JMPX		_IO(u, 0)

Do it right:

#define JBOOT UIOCCMD(1)
#define JMPX  UIOCCMD(0)

The original questioner didn't specify what system this was for.  The
definition for UIOCCMD exists on 4.3.  It doesn't exist in our current
(3.5) Sun <sys/ioctl.h>, even though TIOCUCNTL does; can someone at Sun
explain why this is?  (It's not the only 4.3 feature that's only half
implemented; the fd_set type for select is in the same state.  The
typedef is present but the FD_ZERO, FD_SET, FD_CLR, FD_ISSET macros are
missing.  Is it too much to ask for them to either do it or not do it,
but not halfway?  (Apparently so.)  grumble grumble....)  Anyway, I'd
recommend not using TIOCUCNTL on a Sun, because it appears to be
different from the 4.3 version (no UIOCCMD), and pty(4) doesn't
document it at all, so there's no reason to believe it will do anything
useful.  For all I can tell, it may do a complete reformat of the disk.

					der Mouse

			uucp: mouse@mcgill-vision.uucp
			arpa: mouse@larry.mcrcim.mcgill.edu