Re: [Qemu-devel] [PATCH] disable sigcld handling before calling pclose()

[Wen Congyang]

At 12/20/2010 02:33 PM, Andreas Färber Write:
> Am 20.12.2010 um 02:25 schrieb Wen Congyang:
> 
>> At 12/14/2010 05:23 PM, Wen Congyang Write:
>>> At 2010-12-09 11:41, Wen Congyang Write:
>>>> When I use the command 'virsh save' to save the domain state,
>>>> I receive the following error message:
>>>> operation failed: Migration unexpectedly failed.
>>>>
>>>> I debug the qemu by adding some printf(), and find the function
>>>> pclose() returns -1.
>>>>
>>>> I use strace to trace qemu, the log is as the following:
>>>> ======
>>>> close(17)                               = 0
>>>> --- SIGCHLD (Child exited) @ 0 (0) ---
>>>> wait4(-1, NULL, WNOHANG, NULL)          = 22016
>>>> rt_sigreturn(0)                         = 0
>>>> wait4(22016, 0x7fff7f1034fc, 0, NULL)   = -1 ECHILD (No child
>>>> processes)
>>>> ======
>>>>
>>>> We wait the child twice: one is in signal SIGCHLD handling and the
>>>> other
>>>> one is in pclose().
>>>>
>>>> We should disable sigcld handling before calling pclose().
>>>>
>>>> Signed-off-by: Wen Congyang <address@hidden>
>>>>
>>> Ping :)
>>>
>>>
>>
>> Ping Again... :)
> 
> os-posix.c part looks sane to me, but what about Win32? Wouldn't it need
> stub functions?
I do not know whether there is same BUG on Windows.

I will add stub functions for Win32.
> 
> Andreas
>