Re: [PATCH 2/3] qsd: Add --daemonize

[Hanna Reitz]

On 30.12.21 17:12, Vladimir Sementsov-Ogievskiy wrote:
> 22.12.2021 14:41, Hanna Reitz wrote:
> > This option does basically the same as --fork does for qemu-nbd:
>
> Can we share the code?
>
> Before this patch we already have --fork code-path of qemu-nbd and 
> -daemonize code-path of QEMU.. Now we have one more. Did you consider 
> improving and sharing the old code instead?

I didn’t really, to be honest.  I disliked sharing code with qemu-nbd, 
because, well, that would mean touching qemu-nbd (which I’d rather 
avoid).  Then again, I suppose we could theoretically just drop the 
daemonizing code from qemu-nbd, and replace it by calls to daemonize() 
and daemon_detach().  The only problem with that would be that we need 
some file into which to put it, that is linked into both qemu-nbd and 
the QSD.

QEMU proper already has os_daemonize() and os_setup_post(), but they’re 
quite different from what qemu-nbd does, for example, it doesn’t call 
qemu_daemon(), and it chdir()s to / (which we probably don’t want?).

I preferred to go with what qemu-nbd does, because I thought if it works 
for qemu-nbd, it should work for QSD, too.  Maybe I’m wrong, though, 
maybe we should just use os_daemonize() and os_setup_post().

Hanna