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From: Tom Tromey <tromey@redhat.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: archer@sourceware.org, utrace-devel@redhat.com
Subject: Re: gdbstub initial code, v3
References: <20100811235810.GA9783@redhat.com>
	<20100812011113.GA13212@redhat.com>
	<20100812023750.GA17011@redhat.com>
Date: Thu, 12 Aug 2010 04:37:00 -0000
In-Reply-To: <20100812023750.GA17011@redhat.com> (Oleg Nesterov's message of
	"Thu, 12 Aug 2010 04:37:50 +0200")
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>>>>> "Oleg" == Oleg Nesterov <oleg@redhat.com> writes:

Oleg> So, the patch below fixes the problem, and gdb + /proc/ugdb seems
Oleg> to work.

Oleg> Indeed, gdb sees that this fd is not pipe/tcp and uses the "hardwire"
Oleg> serial_ops, but hardwire_readchar() doesn't play well with select().

Oleg> Please teach gdb to use poll/select ?

I looked at this a little bit.  It seems to me that the "hardwire" stuff
is for talking to ttys, and we instead want gdb to be using the pipe code.
Maybe a little hack to stat the open_name in the hardwire case (in
serial_open) would be appropriate.

Tom