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From: Sam <batmanustc@gmail.com>
Date: Fri, 25 Aug 2017 11:09:11 +0800
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Subject: Re: [Qemu-devel] [QGA] Bug of qga?
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To: qemu-devel@nongnu.org

Also I found:

when I use `socat` to take a qga socket, then I use `socat` to communicate
it will got error.
But also SOMETIMES, I will not got error and will communicate OK.

If one user take qga socket, another user should got error, is it? But why
sometimes, the communicate is OK?

2017-08-25 10:11 GMT+08:00 Sam <batmanustc@gmail.com>:

> Hi all,
>
> I'm using qga to send `route -n` and `ping` command to guest. But I found
> SOMETIMES, the second `ping` command's result is the same as `route -n`
> command.
>
> So I guess is there some cache mechanism of qga command result? So when I
> send the second command, and receive from qga socket, I receive the result
> of first command.
>
> Or is this bug happened because of I use async mechanism of python code to
> operate qga socket?
>
> This is the python code I use to operate on this qga socket:
>
> try:
>>         sock=socket(AF_UNIX, SOCK_STREAM)
>>         sock.settimeout(20)
>>         sock.connect(vm_qga_sockpath)
>>         sock.send(cmd)
>>         while True:
>>             res = sock.recv(1024)
>>             if len(res):
>>                 break
>>     except Exception as e:
>>         res = -1
>>     finally:
>>         sock.settimeout(None)
>>         sock.close()
>
>