CVS log for emstar/fusd/include/fusd.h
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* added more control over device export.
* added a new bit to force export
* added a global flag to set export for all devs for a process, set in misc_init
  by the --enable-remote tag

lots of changes to support the 802.11 ceiling array
* emcee deprecated in favor of emsim --ceiling
* ceiling configuration now done through .sim file
* proxy-host directive enables connection via fusdnet to remote host
* hostmote runs either locally as part of the node, or if proxy-host
  set, connects via fusdnet to another server
* mote devices now are part of the /dev/sim/group... hierarchy
* new --no-ceiling directive added to channel model to prevent it
  from being run when in ceiling mode

Big commit -- the bulk of the Cygwin compatibility is being checked in here.
The Cygwin port doesn't really run yet since FUSD hasn't been ported, but,
with this checkin, the rest of the repository compiles.

more patches to work with kernel 2.6.

* minor changes to support new refcounting in kfusd.
* changes to support 32-bit device numbers.. though userspace is still
  in 16 bit-land

* major checkin of fusdnet work.

* fusd API changes
  * fusd_context_t instead of g_event_t
  * added option to disable fusdnet functionality
  * propagated changes throughout libdev etc
  * changes to fusd_msg to support new fusdnet message type

* audio server
  * got rid of stupid rflink junk
  * fixed fusd api change

* Modified FUSD to support unlimited numbers of devices in non-devfs mode
* Modified FUSD status protocol to support diffs with a 10-second refresh

added the copyright notice to all the source code in the cens repository

- added a copyright notice to all the source code files in the cens
repository

Moved /dev/fusd and /dev/fusd_status into a /dev/fusd directory; renamed
/dev/fusd/control and /dev/fusd/status.

/dev/fusd/* now have constants instead of literals in the code.

added some debugging to packetdev
* added a new unparse_flags to libfusd
* added a debug status function to packetdev that reports on the
  status of all clients for a packetdev

changed param of fusd_register to const char *

fusd_dispatch() no longer has a return value - it simply prints an error
in case something goes wrong.  This makes sense since it is often buried
in functions that make the return value inaccessible anyway, such as
fusd_dispatch_fdset().

Merged FUSD with main branch again

FUSD change: fusd_get_polldiff_current_flags -> fusd_get_polldiff_cached_state

I've changed the name of the above function to
"fusd_get_polldiff_cached_state", which I think more accurately describes
what it actually does.  (I realized that the name was potentially confusing
while trying to write an explanation of how the poll_diff function works.)
The "current state" (according to the explanation I'm writing up), is the
actual poll state known by the driver at any given instant.  The argument
passed in a poll_diff callback, on the other hand, is not really the
"current" state, but rather the state that the kernel has *cached*.  Given
the two terms "current" and "cached", it's easier to explain that you
should "update the cache if the cache doesn't match the current value".

Merged in the new FUSD from the main development branch

Added accessor for non-data-bearing ioctl arguments

Added fusd_destroy, which allows drivers to destroy file state instead
of being forced to return it spuriously (e.g., blocked system calls which
were aborted by the file closing, or poll_diffs that get superceded)

fusd_dispatch() no longer has a return value - it simply prints an error
in case something goes wrong.  This makes sense since it is often buried
in functions that make the return value inaccessible anyway, such as
fusd_dispatch_fdset().

Fixed use of the null do-while 0 use

Did a lot of work in trying to optimize the scheduling of fusd drivers
and the processes using them.

In the kernel: the driver now immediately yields the processor when
it completes a syscall.

In the user-space library: we now try to read as many fusd messages as
possible in fusd_dispatch() before giving up; thanks to the new
yielding in the module, it is very likely (when doing bulk data
transfer) that the app will issue another syscall before the driver's
next read.  This minimizes the number of context switches and syscalls
and increased speed by about 50%.  In particular, bulk data transfers
look (to the driver) like a long series of successful reads; no select
or even blocking on read in between!

We also now (optionally) use wake_up_interruptible_sync instead of plain
wake_up_interruptible in cases when we know we are about to yield to
another process.

fusd_run has been changed to take no args and return no retval; it
simply runs forever doing a fusd_dispatch on any readable FDs.  Meant
to be the simplest of "simple" interfaces.  Changed many example
programs to use the new fusd_run().

Changed kfusd.c default debug level from 10 to 2

Changed __VERYSAFE__ to __FUSD_VERYSAFE__

Better error reporting: library now warns you if you're trying to
register a device which already exists under /dev.

Robustness: we now test our theory that devfs is mounted on /dev before
blindly using it.

convenience: if the first characters of the name you're trying to
register are SKIP_PREFIX (usually "/dev/"), skip over them.

Added function prototypes

Took out constants that shouldn't have been there

Added the "simple" registration interace (abuse of the preprocessor!)

Changed the "offset" accessor function to return the pointer to the
variable, not the value, so that it can be modified by the callback.

kernel now passes UID and GID to drivers for their examining pleasure

Important fix - poll_diff now converts from the constants used by the
fusd userspace API (FUSD_NOTIFY_INPUT, FUSD_NOTIFY_OUTPUT) to the
constants used internally by the kernel (POLLIN, POLLOUT)

decls

changed sense of FUSD_NOREPLY

this either completely fucked everything up or implemented select

new notify structure..
poll_diff() implemented

changed notify to selected
added callback dispatch for selected and unblock
added accessor inline functions

YANLS (yet another new locking scheme) and a fix to libfusd so that NOREPLY works

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new torture test
fixed bugs in fusd_run

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first version of all files