Path: utzoo!utgpu!watserv1!watmath!att!cbnewsl!sar0
From: sar0@cbnewsl.att.com (stephen.a.rago)
Newsgroups: comp.unix.wizards
Subject: Re: But I don't wanna do non-blocking I/O...
Message-ID: <1990Jun12.123606.16898@cbnewsl.att.com>
Date: 12 Jun 90 12:36:06 GMT
References: <397@minya.UUCP>
Organization: AT&T Bell Laboratories
Lines: 19

In article <397@minya.UUCP>, jc@minya.UUCP (John Chambers) writes:
> Subject: But I don't wanna do non-blocking I/O...
> Newsgroup: comp.unix.wizards
> 
> Well, here's a little puzzle that has me stumped;
...
> But fgets(buf,n,stdin) returns EOF immediately.
...
> 
> The open() does include F_NDELAY, but
> this is supposed to apply only to the open; it shouldn't
> set non-blocking I/O permanently for the file (I hope ;-).

Here's your problem.  If you open with O_NDELAY, your file
descriptor is in non-blocking mode until you explicitly turn
it off with fcntl.  O_NDELAY affects more than just the open.

Steve Rago
sar@attunix.att.com