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Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running()
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running() |
Date: |
Thu, 20 Jul 2017 13:49:15 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
Amador Pahim <address@hidden> writes:
> Current implementation is broken. It does not really test if the child
> process is running.
What usage exactly is broken by this? Got a reproducer for me?
> The Popen.returncode will only be set after by a poll(), wait() or
> communicate(). If the Popen fails to launch a VM, the Popen.returncode
> will not turn to None by itself.
Hmm. What is the value of .returncode then?
> Instead of using Popen.returncode, let's use Popen.poll(), which
> actually checks if child process has terminated.
>
> Signed-off-by: Amador Pahim <address@hidden>
> Reviewed-by: Eduardo Habkost <address@hidden>
> Reviewed-by: Fam Zheng <address@hidden>
> ---
> scripts/qemu.py | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/qemu.py b/scripts/qemu.py
> index 880e3e8219..f0fade32bd 100644
> --- a/scripts/qemu.py
> +++ b/scripts/qemu.py
> @@ -86,7 +86,7 @@ class QEMUMachine(object):
> raise
>
> def is_running(self):
> - return self._popen and (self._popen.returncode is None)
> + return self._popen and (self._popen.poll() is None)
>
> def exitcode(self):
> if self._popen is None:
return None
return self._popen.returncode
Why is this one safe?
- [Qemu-devel] [PATCH v3 0/3] scripts/qemu.py small fixes, Amador Pahim, 2017/07/20
- [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Amador Pahim, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(),
Markus Armbruster <=
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Amador Pahim, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Markus Armbruster, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Amador Pahim, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Eduardo Habkost, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Amador Pahim, 2017/07/20
- Re: [Qemu-devel] [PATCH v3 1/3] qemu.py: fix is_running(), Lukáš Doktor, 2017/07/21
[Qemu-devel] [PATCH v3 2/3] qemu.py: include debug information on launch error, Amador Pahim, 2017/07/20