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From: dchan@mozart.steinmetz
Newsgroups: comp.lsi,comp.unix.questions
Subject: Help needed when using DBX and MAGIC
Message-ID: <7671@steinmetz.steinmetz.UUCP>
Date: Wed, 21-Oct-87 09:14:55 EDT
Article-I.D.: steinmet.7671
Posted: Wed Oct 21 09:14:55 1987
Date-Received: Sat, 24-Oct-87 06:36:25 EDT
Sender: root@steinmetz.steinmetz.UUCP
Reply-To: pedicone@ge-crd.arpa (John Pedicone)
Organization: General Electric CRD, Schenectady, NY
Lines: 30
Keywords: dbx MAGIC sun
Xref: mnetor comp.lsi:261 comp.unix.questions:4617

We need some help on our Sun's (SunOS 3.4) when debugging the 1986
Berkeley version of MAGIC (a VLSI layout tool).

In particular, when we use dbx to debug some local modifications
to MAGIC, we get the error 

	Stopped (tty output)

we get the prompt, then type
	reset	(because echo is turned off)
	fg	(because the job is in the background)
and then we get the error
	signal IO (possible input/output) in ioctl at 0xee85c
	ioctl+6:                bcss    isatty+0x3c
	(dbx) 


When we try it without the debugger, the program runs properly.
The normal behavior is to create a new window on the monitor,
with a prompt in the original window.

This looks like a problem with stdout, fork, and dbx.
Can anyone give us a clue as to why this is occuring and how to debug
MAGIC without adding a lot of printf statements?

Thanks in advance.

John Pedicone
	pedicone@ge-crd.arpa
	uunet!steinmetz!mozart!pedicone