From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46898) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1btxja-0001wn-6W for qemu-devel@nongnu.org; Tue, 11 Oct 2016 10:08:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1btxjU-0000PM-B1 for qemu-devel@nongnu.org; Tue, 11 Oct 2016 10:08:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57712) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1btxjU-0000OA-4Q for qemu-devel@nongnu.org; Tue, 11 Oct 2016 10:08:40 -0400 Date: Tue, 11 Oct 2016 15:08:34 +0100 From: "Dr. David Alan Gilbert" Message-ID: <20161011140834.GA16796@work-vm> References: <20161011102637.GA28347@zurbaran.home> <20161011131107.GF14917@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161011131107.GF14917@redhat.com> Subject: Re: [Qemu-devel] Multiple QMP socket clients List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Daniel P. Berrange" Cc: Samuel Ortiz , qemu-devel@nongnu.org * Daniel P. Berrange (berrange@redhat.com) wrote: > On Tue, Oct 11, 2016 at 12:26:37PM +0200, Samuel Ortiz wrote: > > Hi, > > > > On a qemu instance started with a qmp unix socket: > > > > -qmp unix:/tmp/ctrl.sock,server,nowait > > > > I am trying to have multiple clients working on that socket but > > although the qmp server seems to accept the connections, only the first > > connected client gets his request processed. The next client requests > > will just hang until the first one exits. > > > > Is that an intended behaviour ? > > Yes, the character device code is designed around the idea of a single > endpoint. > > In the case of the monitor you could work around it by adding multiple > -qmp arguemnts, each with different socket. Of course you have to make > sure each client doesn't trample on the other client when doing this. But why does it accept the connection? I thought you could say only accept a single connection on a socket. (The backlog parameter to listen(2) but I can't find out listen.) Dave > > > Regards, > Daniel > -- > |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| > |: http://libvirt.org -o- http://virt-manager.org :| > |: http://entangle-photo.org -o- http://search.cpan.org/~danberr/ :| > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK