|
From: | Kevin Wolf |
Subject: | Re: [Qemu-devel] [PATCH v4 0/7] file descriptor passing using pass-fd |
Date: | Tue, 26 Jun 2012 13:45:52 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 |
Am 26.06.2012 11:10, schrieb Daniel P. Berrange: > I was thinking about some of the sources complexity when using > FD passing from libvirt and wanted to raise one idea for discussion > before we continue. > > With this proposed series, we have usage akin to: > > 1. pass_fd FDSET={M} -> returns a string "/dev/fd/N" showing QEMU's > view of the FD > 2. drive_add file=/dev/fd/N > 3. if failure: > close_fd "/dev/fd/N" In fact, there are more steps: 4. use it successfully 5. close_fd "/dev/fd/N" I think it would well be possible that qemu just closes the fd when it's not used internally any more. The point of close_fd is more that libvirt still keeps a handle and can make use of this fd. One example where this is necessary is reopening the FD of a backing file in order to perform a live commit operation. Kevin
[Prev in Thread] | Current Thread | [Next in Thread] |