Path: news.funet.fi!fuug!mcsun!hp4nl!hgatenl!tedux!wiesje!baron
From: baron@wiesje.hobby.nl (Wim `Blue Baron' van Dorst)
Newsgroups: comp.os.minix
Subject: [source] Re: (kernel/tty.c) O_NONBLOCK - patch
Message-ID: <911027502@wiesje.hobby.nl>
Date: 27 Oct 91 21:18:59 GMT
References: <2219@tuegate.tue.nl>
Organization: Minix Hobbynet Host
Lines: 125

Hello *,

In a previous article on this I wrote:
> Perhaps someone (Kai-Uwe, Christian, I, ...) can make a new and complete
> patch, comprising the original Kai-Uwe patch, Christian's (cbreak and
> casting) and mine (posix requirement), and post it again. I will if nothing
> is done in some weeks.

Find below the combined implementation of Kai-Uwe, Christian (or Thomas?),
and myself, to get a Posix compliant implementation of non-blocking reads
on terminal devices. The provided patches are twofold:
  1. against official PH 1.5.10 PC Minix tty.c
  2. against _the_ Virtual Console package tty.c

NOTE:
The here provided patch has only a limited scope. From the interest shown
to me I gathered that it was suggested that it was more than it really is.

The patch gives you:
Posix compliant non-blocking mode for read()s on terminal devices in either 
canonical mode (Raw, Cbreak or Cooked). See IEEE 1003.1 Posix, pages
111-113 for more details.

The patch gives you *NOT*:
non-blocking write()s, nor open()s on terminals (Posix suggestion).
  The 1.5.10 open() accepts the O_NONBLOCK flag, but, as far as I see 
  it, it just gets ignored. The fcntl() should be used to get non-blocking
non-blocking read()s, write()s, nor open()s on other devices.
  The main reason that this is not implemented yet is that changes
  should be made to the src/fs/* too, which is more complicated.
  Also the not implemented things are less direly needed (who needs a
  non-blocked write on a disk?)

For people interested in interactive games (such as the ones I am
about to post) a Posix compliant non-blocking read is imperative. As far
as I understood there is such available in 1.6.16, but that I am not
sure of (I haven't got 1.6.16. yet). I will presently be trying to
implement more of the non-blocking stuff.

Met vriendelijke groeten, Wim `Blue Baron' van Dorst.
---------------------------------------------------------------------
Blue Baron = Wim van Dorst, Voice (+31) 074-443937, (+31) 02152-42319
(-:       baron@wiesje.hobby.nl           tgcpwd@urc.tue.nl       :-)
---------------------------------------------------------------------

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end

---------------------------------------------------------------------
Blue Baron = Wim van Dorst, Voice (+31) 074-443937, (+31) 02152-42319
(-:       baron@wiesje.hobby.nl           tgcpwd@urc.tue.nl       :-)
---------------------------------------------------------------------