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Re: [Qemu-devel] [PATCH v2] disable sigcld handling before calling pclos
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [PATCH v2] disable sigcld handling before calling pclose() |
Date: |
Wed, 05 Jan 2011 10:15:24 +0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4 |
At 12/21/2010 12:05 PM, 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().
>
> v2:
> - Add stub functions for Win32
>
> Signed-off-by: Wen Congyang <address@hidden>
>
Ping Again... :)
This is a bug fix.
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