Path: utzoo!yunexus!geac!syntron!jtsv16!uunet!lll-winken!lll-tis!ames!nrl-cmf!ukma!gatech!rutgers!att!chinet!les
From: les@chinet.chi.il.us (Leslie Mikesell)
Newsgroups: comp.unix.questions
Subject: Re: input ready under UNIX ??!!??
Message-ID: <6851@chinet.chi.il.us>
Date: 28 Oct 88 18:22:56 GMT
Article-I.D.: chinet.6851
References: <771@necis.UUCP> <547@poseidon.ATT.COM> <320@auspex.UUCP>
Reply-To: les@chinet.chi.il.us (Leslie Mikesell)
Organization: Chinet - Public Access Unix
Lines: 13

In article <320@auspex.UUCP> guy@auspex.UUCP (Guy Harris) writes:

>>(1)  Using fcntl(2), set file descriptor 0 to be non-blocking (what
>>fcntl(5) calls O_NDELAY).  If you want line-at-a-time input, keep

>...
>this means the bottom line is "'read()' will return 0 if no data has
>been entered yet."

On the AT&T 3b2 SysVr3.[01] logging in through the starlan network
(streams based tty emulation) read() will return -1 when no data
is available (and O_NDELAY is set).

Les Mikesell