Add a new library: libulog.

One of the things I really want to do, is to get rid of the limitations
of our current utmp(5) mechanism:

- It only allows 8 byte TTY device names.
- The hostname only allows 16 bytes of storage.

I'm not a big fan of <utmpx.h>, but I think we should at least try to
add parts of it. Unfortunately we cannot implement <utmpx.h>, because we
miss various fields, such as ut_id, ut_pid, etc. The API provided by
libulog shares some similarities with <utmpx.h>, so it shouldn't be too
hard to port these applications eventually. In most simple cases, it
should just be a matter of removing the ulog_ prefix everywhere.

As a bonus, it also implements a function called ulog_login_pseudo(),
which allows unprivileged applications to write log entries, provided
they have a valid file descriptor to a pseudo-terminal master device.

libulog will allow a smoother transition to a new file format by adding
a library interface to deal with utmp/wtmp/lastlog files. I initially
thought about adding the functionality to libutil, but because I'm not
planning on keeping this library around forever, we'd better keep it
separated.

Next items on the todo list:

1. Port applications in the base system (and ports) to libulog, instead
   of letting them use <utmp.h>.
2. Remove <utmp.h>, implement <utmpx.h> and reimplement this library on
   top.
3. Port as many applications as possible back to <utmpx.h>.

1 files changed, 1 insertions, 0 deletions

diff --git a/share/mk/bsd.libnames.mk b/share/mk/bsd.libnames.mk
index 3a3fd86..e70b4fa 100644
--- a/share/mk/bsd.libnames.mk
+++ b/share/mk/bsd.libnames.mk
@@ -151,6 +151,7 @@ LIBUGIDFW?=	${DESTDIR}${LIBDIR}/libugidfw.a
 LIBUMEM?=	${DESTDIR}${LIBDIR}/libumem.a
 LIBUSBHID?=	${DESTDIR}${LIBDIR}/libusbhid.a
 LIBUSB20?=	${DESTDIR}${LIBDIR}/libusb20.a
+LIBULOG?=	${DESTDIR}${LIBDIR}/libulog.a
 LIBUTIL?=	${DESTDIR}${LIBDIR}/libutil.a
 LIBUUTIL?=	${DESTDIR}${LIBDIR}/libuutil.a
 LIBVGL?=	${DESTDIR}${LIBDIR}/libvgl.a