tfheen:  Please review



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"single -d" mode, which nobody ever used, and make -d do what you expect
it to from all other daemons.

It was a nice idea though.



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trigger atexit(3) processing.

Fixes #632



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and bugs right now.




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Found by:	luc/tom28



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With level-triggered epoll, this should take care of the cpu-spinning that
we saw in #644, but needs to be confirmed.


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but does handle the -S authentication for you.

You can now get a secure remote CLI connection by:

	ssh foohost varnisadm -T :8081 -S/etc/varnish_secret

Or you can:

	echo "help" | ssh foohost varnisadm -T :8081 -S/etc/varnish_secret



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the #define is correct.



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from the CLI.

Put in a separate source file, as it should be included in libvarnishapi
as well.



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Use VSS_open() instead of home-rolling.



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compile time constant on all systems.

Pick it up with sysconf() instead.



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these functions.

The [v]asprintf() functions are convenient shorthand, but suffer from
a number of problems, portability, cornercases and performance being
the most relevant to Varnish. 

Static buffers on the stack (see [v]bprintf macros, or sbufs (vsb)
are always better choices for us.



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