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From: guy@sun.uucp (Guy Harris)
Newsgroups: net.unix-wizards
Subject: Re: Help! (on ioctl system call)
Message-ID: <2298@sun.uucp>
Date: Thu, 13-Jun-85 02:07:05 EDT
Article-I.D.: sun.2298
Posted: Thu Jun 13 02:07:05 1985
Date-Received: Sat, 15-Jun-85 09:29:58 EDT
References: <651@sphinx.UChicago.UUCP>
Organization: Sun Microsystems, Inc.
Lines: 11

>     I'm having problems with using the ioctl system call.

The problem is not with the "ioctl" system call but with the specific
"ioctl" call you're using, namely TIOCSPGRP.  If a process attempts to do a
TRIOCSPGRP on its control terminal and it isn't in the same process group as
the terminal, the process gets a SIGTTOU signal and stops (which is why the
state field of the "ps" reports T).

Moral: do the TIOCSPGRP first and then do the "setpgrp" on yourself second.

	Guy Harris