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Path: utzoo!mnetor!seismo!munnari!moncskermit!goanna!yabbie!rcodi
From: rcodi@yabbie.rmit.oz (Ian Donaldson)
Newsgroups: comp.unix.wizards
Subject: Re: stuff chars
Message-ID: <378@yabbie.rmit.oz>
Date: Sun, 7-Dec-86 08:39:39 EST
Article-I.D.: yabbie.378
Posted: Sun Dec  7 08:39:39 1986
Date-Received: Tue, 9-Dec-86 09:51:58 EST
References: <19@houligan.UUCP> <2270@sdcsvax.UCSD.EDU> <104@quacky.UUCP>
Organization: RMIT Comm & Elec Eng, Melbourne, Australia.
Lines: 27
Summary: got TIOCSETN?

In article <104@quacky.UUCP>, dce@quacky.UUCP (David Elliott) writes:
> I have never found a way to change the handling of signals such that
> input is not flushed.

If your system doesn't have TIOCSETN defined (usually in <sys/ioctl.h>) 
then you're probably out of luck.  Using stty(2) or stty(3) is equivalent
to TIOCSETP, that flushes input before changing the modes -- ie: typeahead.

stty() is a system call on older versions of UNIX (and SVR2), but 
a library routine on ones that implement the TIOCSET[NP] ioctl's (eg: bsd 
derived systems).  Similary, for gtty() and TIOCGETP.

The 4.2bsd source for vi/ex has a conditional compile of the following nature:

	#ifdef TIOCSETN
		ioctl(..., TIOCSETN, ...);
	#else
	/* some comment grumbling about problems of typeahead flushing */
		stty(..., ...);
	#endif

in the routine that changes tty modes.

SVR2 has an equivalent to TIOCSETN, TCSETAW, but it works
on a struct termio, instead of struct sgttyb.

Ian Donaldson