MFC r307873,r314397,r314399,r314419,r314420,r314533,r316553:
r307873 (by marcel):
Include <stdarg.h> instead of <machine/stdarg.h> when compiled as
part of libsbuf. The former is the standard header, and allows us
to compile libsbuf on macOS/linux.
r314397 (by scottl):
Implement sbuf_prf(), which takes an sbuf and outputs it
to stdout in the non-kernel case and to the console+log
in the kernel case. For the kernel case it hooks the
putbuf() machinery underneath printf(9) so that the buffer
is written completely atomically and without a copy into
another temporary buffer. This is useful for fixing
compound console/log messages that become broken and
interleaved when multiple threads are competing for the
console.
r314399 (by scottl):
Add prototype for sbuf_putbuf()
r314419 (by jkim):
Include stdio.h to fix libsbuf build.
r314420 (by scottl):
Provide a comment on why stdio.h needs to be included.
r314533 (by scottl):
Expose the sbuf_putbuf() symbol to libsbuf. There are a few other symbols
that are present but not exposed, like get/set/clear flags, not sure if they
need to be exposed at this point.
r316553:
sbuf(3): expose sbuf_{clear,get,set}_flags(3) via libsbuf
These functions were added to sbuf(9) in r279992, but never
exposed to userspace. Expose them now so they can be used/tested.
git-svn-id: svn://svn.freebsd.org/base/stable/10@321108
ccf9f872-aa2e-dd11-9fc8-
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