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Re: [Qemu-devel] [PATCH] disable sigcld handling before calling pclose()
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [PATCH] disable sigcld handling before calling pclose() |
Date: |
Mon, 20 Dec 2010 09:25:01 +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 12/14/2010 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... :)