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From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.unix.ultrix
Subject: Re: reading standard output
Keywords: ultrix read stdout
Message-ID: <15144@cbmvax.commodore.com>
Date: 13 Oct 90 23:58:43 GMT
References: <21072@versatc.versatec.COM>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 16

In article <21072@versatc.versatec.COM> tamura@versatc.versatec.COM (Mark Tamura) writes:
> how do you read data from standard output?  i'm writing a program that
> sends data to a device and needs to read status back for error conditions.
> 
> i've tried using the flags field in the iob, however i still get the
> bad file (errno = 9) message on the read(1, ... )

Naughty, Naughty!

See dup(2) and fdopen(3), you want to create a second path to the same
device not try to force I/O on the the "output" stream.

-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr@cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)