From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Cc: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH 2/3] Always use nonblocking mode for qemu_chr_open_fd.
Date: Fri, 25 Jul 2008 17:17:14 +0100 [thread overview]
Message-ID: <20080725161714.GA11760@shareable.org> (raw)
In-Reply-To: <48897D83.9020707@redhat.com>
Gerd Hoffmann wrote:
> Fundamental problem is there is no easy way to figure whenever we are
> connected or not. Well, detecting the "connected -> disconnected"
> transition is easy, as read() starts giving us -EIO then. The
> problematic case is the "(initial state | disconnected) ->
> (re-)connected" transition. We have to try read() now and then to check
> whenever we still get -EIO or not.
Btw, I've just tested. In the initial state, the tty side never
opened, read() blocks and poll/select report that it's not ready for
read.
So the initial state is no problem, it doesn't need polling.
Only disconnected -> reconnected is a problem.
-- Jamie
next prev parent reply other threads:[~2008-07-25 15:55 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-18 13:24 [Qemu-devel] [PATCH 2/3] Always use nonblocking mode for qemu_chr_open_fd Ian Jackson
2008-07-23 1:26 ` Anthony Liguori
2008-07-23 8:24 ` Daniel P. Berrange
2008-07-23 11:48 ` Gerd Hoffmann
2008-07-23 12:15 ` Daniel P. Berrange
2008-07-23 12:52 ` Gerd Hoffmann
2008-07-23 12:59 ` Daniel P. Berrange
2008-07-23 14:24 ` Gerd Hoffmann
2008-07-23 15:24 ` Anthony Liguori
2008-07-23 15:31 ` Daniel P. Berrange
2008-07-23 15:32 ` Anthony Liguori
2008-07-23 16:17 ` Gerd Hoffmann
2008-07-23 16:33 ` Anthony Liguori
2008-07-23 19:08 ` Jamie Lokier
2008-07-24 7:24 ` Gerd Hoffmann
2008-07-24 7:54 ` Gerd Hoffmann
2008-07-24 8:31 ` Daniel P. Berrange
2008-07-24 9:24 ` Jamie Lokier
2008-07-24 9:33 ` Samuel Thibault
2008-07-24 11:18 ` Gerd Hoffmann
2008-07-23 16:11 ` Gerd Hoffmann
2008-07-23 16:31 ` Anthony Liguori
2008-07-24 8:35 ` Daniel P. Berrange
2008-07-24 14:23 ` Anthony Liguori
2008-07-24 15:07 ` Jamie Lokier
2008-07-24 14:53 ` Gerd Hoffmann
2008-07-23 16:44 ` Paul Brook
2008-07-24 17:37 ` Anthony Liguori
2008-07-25 7:15 ` Gerd Hoffmann
2008-07-25 16:17 ` Jamie Lokier [this message]
2008-07-28 8:49 ` Gerd Hoffmann
2008-07-28 11:59 ` Jamie Lokier
2008-07-28 12:20 ` Gerd Hoffmann
2017-02-01 12:33 ` David Woodhouse
2008-07-24 15:37 ` [Qemu-devel] " Anthony Liguori
2008-07-25 11:42 ` Gerd Hoffmann
2008-07-25 15:04 ` Anthony Liguori
2008-07-28 9:59 ` Gerd Hoffmann
2008-07-28 18:55 ` Anthony Liguori
2008-07-23 9:34 ` [Qemu-devel] " Kevin Wolf
2008-07-23 10:17 ` Ian Jackson
2008-07-23 11:43 ` Kevin Wolf
2008-07-23 12:04 ` Gerd Hoffmann
2008-07-23 12:18 ` Paul Brook
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080725161714.GA11760@shareable.org \
--to=jamie@shareable.org \
--cc=paul@codesourcery.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).