Re: [Xen-devel] [RFC][PATCH] Use ioemu block drivers through blktap

[Kevin Wolf <kwolf@xxxxxxx>]

Ian Jackson schrieb:
> Sorry for picking this up now, but I'm trying to reconcile ioemu with
> qemu and I wondered what the purpose of these changes was:
> 
>> +static void qemu_sighup_handler(int signal)
>> +{
>> +    fprintf(stderr, "Received SIGHUP, terminating.\n");
>> +    exit(0);
>> +}
>> +
> 
>> -    signal(SIGHUP, SIG_DFL);
>> +    signal(SIGHUP, qemu_sighup_handler);

I needed a shutdown handler to properly close the blktap connection and
delete the named pipes associated with the qemu-dm instance. When a
domain is destroyed, qemu-dm receives a SIGHUP. However, with the
default SIGHUP handler no atexit functions are called, so I had to add
this handler which performs a clean exit.

Kevin

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