Hi Jagannathan, This was not published on avocado-devel since it is moderated. Sorry about that.
Replying here to reach Cleber, afaict, he was working with fd on QEMU. -- Beraldo On Mon, Nov 23, 2020 at 03:29:47PM -0500, Jagannathan Raman wrote: > > > Hi, > > I’m trying to pass a file descriptor to the QEMU process created by Avocado. > However, > I’m having some trouble with it. Could someone please help me with it? > > For context, I’m attaching the source code of the test I’m having trouble > with. The test is > trying to pass “remote_sock” and “proxy_sock” as arguments to the QEMU > processes. > However, it looks like python3 does not allow child processes from inheriting > file > descriptors by default. I believe python3 requires the subprocess.Popen() > method to > specify the file descriptors to be passed in using the “padd_fds” argument. > I’m wondering > if there is a way to tell Test.vm.launch() method to pass some file > descriptors to the > QEMU processes. Could you please confirm? > > Thank you very much! > -- > Jag > > > > > Begin forwarded message: > > > From: Jagannathan Raman <jag.ra...@oracle.com> > > Date: November 21, 2020 at 8:43:01 PM EST > > To: Philippe Mathieu-Daudé <phi...@redhat.com> > > Cc: Elena Ufimtseva <elena.ufimts...@oracle.com>, Stefan Hajnoczi > > <stefa...@redhat.com> > > Subject: Passing File Descriptors with Avocado tests > > > > Hi Phil, > > > > I’ve hit a roadblock while working on the acceptance test you wanted us to > > do. > > > > The issue is that we are not able to pass file descriptors from the Avocado > > python module to QEMU. By default, python3 prevents the child process from > > inheriting the parent’s file descriptor (which is a change from python2, > > which allowed file descriptor to inherited from the parent automatically). > > > > For this reason, we used “pass_fds” argument with the subprocess.Popen() > > method, in the script we included. However, we are wondering how to achieve > > something similar in the context of the avocado tests. > > > > Is there a way to tell the “Test.vm” object in Avocado to pass certain fds > > to the child process? > > > > Do you where the source for Test.vm object is? I’m wondering if we could > > add arguments to the Test.vm.launch() method to allow some file descriptors > > to be passed to the child. > > > > We have everything in place for the next series of patches. We’ve been > > stuck on this one, and wondering how to proceed further. > > > > Thank you very much! > > — > > Jag
