[Sheepdog] [PATCH] logger: correct crash_handler output

[Shevek]

On Sat, 2012-04-28 at 21:59 +0800, Liu Yuan wrote:
> On 04/28/2012 09:54 PM, Christoph Hellwig wrote:
> 
> > We'd still like to print the pid of the died sheep pid - getppid()
> > should do that work for that.
> 
> 
> Yes, I tried use getppid() initially, but I found that getppid() always
> return 1 in my distro (ubuntu) and I didn't try to trace why. So I
> simply remove pid, given that some bug in other place or my dirstro goes
> ill-configured.
> 
> Maybe I'd better call getppid() here and wait fixes from other place.

The reason getppid() returns 1 is that it was called in the sheep, and
the parent is (correctly) init. If log_sigexit() is called in the sheep,
you need getpid().

Since it is possible for any signal, especially SEGV, to be delivered
either to the sheep or the logger, we need a flag to tell the method
which process received the signal.

Christoph, remember we discussed this briefly?

S.