Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!cmcl2!rutgers!sri-spam!mordor!lll-tis!ptsfa!ihnp4!homxb!mtuxo!mtune!codas!ablnc!latham
From: latham@ablnc.ATT.COM (Ken Latham)
Newsgroups: comp.unix.wizards
Subject: Re: TERMIO wait /no wait operation
Message-ID: <337@ablnc.ATT.COM>
Date: Wed, 7-Oct-87 12:55:32 EDT
Article-I.D.: ablnc.337
Posted: Wed Oct  7 12:55:32 1987
Date-Received: Sat, 10-Oct-87 19:18:02 EDT
References: <403@acp.OZ>
Organization: AT&T, Maitland, Florida
Lines: 39
Keywords: TERMIO ICANON TIMEOUT
Summary: How to get indefinite wait from TERMIO

In article <403@acp.OZ>, julian@acp.OZ (Julian Elischer) writes:
> Reading the unix system V.2 and V.3 manuals, I see that 
> if ICANON is not set then a read will return an TIME 10ths 
> of a second or when MIN characters are available.
> I cannot however see how to get it to sit indefinitly
> and wait for a character. .....

> 1/ what is the exact configuration of termio needed
>     give the standard RAW mode under sysV.

	ICANON  off        Standard RAW ?????  no such beastie :->
	MIN     1
	TIMEOUT 0

> 2/ is there a similar timeout facility available
>    for pipes or do i HAVE to use ALARM/SIGNAL etc?

	use Alarm/Signal this is much more portable.

> 3/ is there any clearer description of SYSV.3 shared memory/
>    massages/semaphore operations than the hopeless ATT
>    "Documentation".. something that describes the whole
>    thing in a useable way instead of drowning you in details.

	I assume the "documentation you are refering to is the standard
	manual set, yes this is just facts to guide the experienced user.
	The "AT&T :-) System V Interprocess Communications Guide"
	is what you want it gives examples and explains the
	ordinary use of queues, shared memory and semaphores.

> 4/ does a value of 255 or something disable the TIMEOUT in the
>    affore mentioned TERMIO ~ICANON mode ?

	see above


					Ken Latham
					AT&T Support
					..!ihnp4!ablnc!latham