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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: Tue, 14 Dec 2010 17:23:23 +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 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 :)



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