Changes are listed in *reverse* order, most recent changes being
first.

version 0.95

PATCHLEVEL13::

proto.h,filesys.c:
	Added Alex's patches for Lattice.

PATCHLEVEL12::

dosdir.c:
	Fsnext() on symbolic links was broken, because
	relpath2cookie no longer checks drive letters
	unless "depth" is > 0. Fixed this.
main.c,filesys.c:
	Added support for putting the mint.cnf file
	and any *.XFS files into the directory \mint.
dos.c:
	Added Pgeteuid() and Pgetegid() system calls.
main.c:
	Fixed the "set current directory" code to
	work properly.
main.c:
	Added a sanity check; if GEM is already running,
	don't try to run it again.
procfs.c:
	Added FIONWRITE and FIONREAD ioctl calls.
proc.c,bios.c:
	Fixed the type of the critical error handler.
dosfile.c,file.h,proc.c:
	Added Alex's patches for O_APPEND and O_NOINHERIT.
shmfs.c:
	Fixed lseek() on shared memory segments, and added
	FIONWRITE and FIONREAD ioctl calls.
fasttext.c:
	Tried once again to tame the wild cursor.
dosmem.c,proc.c:
	Modified process startup code so that PROC structures are no
	longer kept forever by the kernel (which should help alleviate
	memory fragmentation problems a bit).

PATCHLEVEL11::

dosmem.c:
	Applied Alex Kiernan's SIGTRAP bug fix (and kicked myself for
	forgetting C's precedence rules; thanks, Alex!).
filesys.c:
	Fixed relpath2cookie so that names like "C:\Z:" aren't
	interpreted as referring to drive Z:.
fasttext.c:
	Restored the "turn on cursor when opening()" code, because
	without it the fasttext driver and BIOS aren't in sync.
main.c:
	Moved the check for the presence of an already existing MiNT
	cookie to earlier in the initialization process, so that
	the error message can be printed properly.
shmfs.c:
	Fixed Dpathconf() on U:\SHM (filenames are truncated automatically
	on that file system) and corrected the comment there.
syscall.s:
	New function, call_aes, used to check for the presence of GEM
	(so we can tell whether or not we're running from the AUTO folder).
main.c:
	Run any programs which come after mint.prg in the AUTO
	folder.
version.h:
	Changed so that the patchlevel is always printed on boot-up.

PATCHLEVEL10::

unifs.c:
	Add U:\SHM as an interface for shared memory.
shmfs.c:
	New file system for doing shared memory.
xbios.c:
	Fixed Bconmap() to always return an error if the underlying
	TOS doesn't support Bconmap.
main.c:
	Fixed a bug in the argument parsing code for the "exec"
	command in mint.cnf.
dosdir.c:
	Changed Dlock() to return ELOCKED if an attempt is made to
	lock a drive that's already locked, and ENSLOCK if an attempt
	is made to remove a non-existent lock.
version.h:
	I forgot again to update this. Aargh!

PATCHLEVEL9::

mem.c,mem.h:
	Align everything on 16 byte boundaries.
mem.c,dosmem.c:
	Actually fix the "memory being allocated twice" bug.
	The problem was that setting m->links to 0 before calling
	attach_region was a no-no.

PATCHLEVEL8::

mem.c:
	Attempt to fix the strange "memory being allocated
	twice" bug.
tosfs.c:
	Truncating names at 14 characters came *before* the
	8.3 kludge, which meant that long names were being
	interpreted incorrectly (e.g. gcc-cc1plus.ttp was
	becoming "gcc-cc1p.tt"). Temporary kludge: only
	truncate at 32 characters. Long term solution:
	re-write this code to do the 8.3 truncation at the
	same time as the truncation.
main.c, proc.h:
	Provide a more explicit type for criticerr.
proc.c:
	Don't make _logbase per-process if hardware scrolling
	is active, since this makes for all kinds of weirdness!
mem.c:
	Allow NULL commandline to be the same as an empty
	string. (It was acting this way before, due to the MiNT
	library strncpy; now that we use our own strncpy some
	programs were passing funny arguments.)
dosmem.c:
	Provide a more detailed trace of Pexec activity.
mem.c:
	Added a sanity check in get_region().
proc.c:
	Set the time/date stamp of process 0 to the
	date & time when the system was booted.
fasttext.c:
	Commented out the code that turns the cursor
	on when u:\dev\fasttext is opened.
tty.c:
	Unsigned characters are always >= 0, so we
	don't need to check this.

PATCHLEVEL7::

makefile.lcc,mintlc.prj:
	Added Alex's patches.
assert.h:
	Added Alex's patch to cast the result to void.
filesys.c:
	Make sure the file system media change routine
	is called every time a disk change is forced;
	this corrects the Dlock() bug (it wasn't forcing
	media change as it should have).
version.h:
	Oops! I forgot to increment this for pl6, so
	it jumps by 2 this time.

PATCHLEVEL6::

biosfs.c,pipefs.c,tty.c:
	New Fcntl calls for controlling terminal baud
	rates and flags such as parity and stop bits.
	These have been integrated with the old TIOC*
	calls where applicable.
dosfile.c:
	Changed Fcntl to make a call to tty_ioctl be the
	default if the device is a terminal and the device
	ioctl routine returns EINVFN.
procfs.c, proc.c:
	The date/time stamp of a process now shows when the
	process was started, rather than being the number
	of seconds of CPU time used.
tosfs.c:
	Degrade an ALERT to a TRACE; there is a circumstance
	in which a root directory can apparently be changed,
	and that's when a program tries to open an empty
	file name. We don't need to warn the user that
	something is wrong in this case; we can just fail
	silently.
proc.c:
	Save the logical screen base for each process.
main.c,bios.c,proc.h:
	Made the critical error handler per-process.
bios.c,syscall.s:
	A cleaner way of saving registers when calling
	functions... this wasn't really necessary, but I
	did it to make tracking a bug down easier.
tty.c:
	New terminal flag, T_NOFLUSH, to suppress flushing of
	input when SIGINT or SIGQUIT is received.
*fs.c, file.h:
	Added a new Dpathconf() option that tells whether or
	not a file system is case sensitive.
dos.c:
	Forbid Prenice() on processes that you don't own.
dosmem.c:
	Correct a typo that was causing terminal process groups
	to be incorrectly set.

PATCHLEVEL5::

makefile:
	The -DOWN_LIB declaration should have been on (actually,
	it was, in my copy... sorry for the mix-up).
fasttext.c:
	Applied Alex's patch for the disappearing cursor bug.
everywhere:
	Applied Alex's patches to add "const" declarations where
	appropriate, and to get rid of size_t (since if OWN_LIB
	is defined we use "int" instead).
dosmem.c:
	Fixed M_KEEP to attach memory to rootproc *only* at
	process termination.


PATCHLEVEL4::

proto.h:
	Added prototype for do_func_key().
everywhere:
	Applied apratt's debugging/trace patches.

PATCHLEVEL3::

xbios.c, biosfs.c:
	Change Bconmap to actually do the equivalent of an
	Fforce(-2, foo) call; this way, we don't need the
	ugly DFLTMODM kludge. (On the other hand, we introduce
	some new ugly kludges :-)).
main.c,proc.c:
	Wait until everything is initialized before opening
	devices; this avoids bogus critical error messages from
	AHDI.
util.c, mint.h, ctype.h:
	Add all sorts of utility routines (for string processing,
	character type recognition, and the like). This is
	designed to make sure that MiNT works the same regardless
	of what library is used to compile it. We're not quite
	totally independent of library yet (the startup code and
	<osbind.h> aren't replaced) but we're pretty close.
main.c, proc.c:
	Initialize the current directory for the root
	process *after* file systems have been loaded, since
	otherwise the info is nuked when a new fs is loaded in.
bios.c:
	Allow output to BIOS device 5 to be redirected along
	with BIOS device 2; we do this by using the MW
	ESC-Q control sequence to quote characters. A bit of
	a hack, but then, not many people use device 5.
quickmov.s:
	Fixed two bugs in quickmove: (1) it didn't work for
	regions bigger than 0x00fffe00 bytes in length,
	and (2) it assumed the length was a multiple of 4
	bytes.
fasttext.c:
	Re-arrange things a bit to get rid of a gcc 2.1 warning.
dosmem.c:
	Change flag 0x4000 to mean "don't free the memory
	automatically on process termination"; explicit
	Mfree requests are still allowed, and after
	termination *any* process may Mfree the memory.

PATCHLEVEL2::

makefile:
	Remove -fcombine-regs from CFLAGS, since gcc 2.1
	doesn't understand it.
bios.c:
	Ignore value returned by Bconout for the screen
	(many text accelerators get this wrong :-( ).
dossig.c, signal.h:
	New system call, Psigaction(), by AGK. 
xbios.c:
	Added support for Bconmap.
bios.c, biosfs.c:
	Rationalized the way biosfs and bios interact;
	no more funny device numbers are needed. Also:
	added support for Bconmap, and a new default
	modem device.
pipefs.c:
	Applied Michael Hohmuth's patch for pipe_close (thanks,
	Michael!)
filesys.c:
	Don't try to initialize all the drives at boot time; path2cookie
	is quite capable of initializing, and it saves having
	to access drive B: (for example) while booting is going
	on.
main.c:
	Allow the user to avoid booting MiNT if the right shift key
	is held down.
main.c:
	Added safety checking, as suggested by AKP.
dosmem.c:
	In Mxalloc, if (mode & 0x4000) is nonzero then allocate non-freeable
	memory (we do this by attaching the memory to the root process).
fasttext.c:
	Tabs should be non-destructive on the ST!
proc.h:
	Re-arranged some things. Note that "slices" was never supposed
	to be visible to users! Also, added a "bconmap" variable to
	give the current Bconmap mapping for the process.
dosdir.c:
	Fail Ddelete of current directories only on the current
	drive; for other drives, reset the current directory
	to the root directory. NOTE: Ddelete of a current directory
	is forbidden only if the directory is someone else's
	current directory; if it's only your current dir., you
	can delete it (and get automatically bumped back to
	root).

PATCHLEVEL1::

dosmem.c:
	Fixed a bug that caused processes with no '.' in their names
	to have the wrong process name.
dosmem.c:
	In Pexec, make sure we yield to the new process so that
	it gets at least one timeslice to do an Mshrink().
proc.c:
	In preempt(), don't punish processes that have buffered
	BIOS output and are preempted; the process of flushing the
	buffer may very well put them to sleep, and in any event
	processes doing I/O should not be considered "hogs".
tosfs.c:
	Don't look for volume labels in opendir/readdir/lookup etc.
main.c:
	AGK: added DEBUG_LEVEL and DEBUG_DEVNO options to mint.cnf.
dossig.c:
	New system call (Psigpause()) courtesy of Alex Kiernan.
dosmem.c:
	In Pexec(200,...), don't reset base->p_parent, since the
	"parent" in an overlay exec is oneself.
tty.c:
	Fixed so that RAW mode reads will return all of an
	extended escape sequence at once, rather than waiting
	for the next read.
dosmem.c:
	When terminating a process, make sure that it's "number of
	memory regions" is set to 0; otherwise, calls to memused()
	on the process (e.g. by procfs) can crash the system.
dosdir.c:
	When removing directories, make sure that the directory
	isn't in use as someone's current directory (so that
	they don't get left in limbo).
fasttext.c:
	Screen memory must come from ST RAM -- otherwise hardware
	scrolling crashes and burns. Fixed thanks to AGK.
xbios.c:
	Moved the prototype for midiws to proto.h, and corrected the
	type of its argument (it should have been "int", not "short").

PATCHLEVEL0::

bios.c:
	Terminal modes weren't being set correctly in Bconout, and also
	weren't being set in bflush (which should have employed RAW
	mode output, but didn't).
everywhere:
	Merged in Alex Kiernan's latest Lattice C patches.


version 0.94

PATCHLEVEL4::

filesys.c:
	Use U:\DEV\CON for CON:, instead of V:\CON, since we're
	going to make drive V: go away soon.
unifs.c:
	When looking up a drive, make sure that it has a valid file
	system attached to it -- otherwise, newly installed ramdisks
	can cause system crashes :-(.
fasttext.c:
	Patches to make the fast text device work correctly on a TT,
	courtesy of Erling Henanger.
main.c:
	Install 16 extra cookies, instead of 8, just to be friendly.

PATCHLEVEL3::

main.c:
	Allow PSEUDODRIVES=MAP to put the extra drives in
	_drvbits without installing new drivers for them.
unifs.c:
	Don't rely on drvmap() to figure out what drives exist;
	it isn't accurate if PSEUDODRIVES=NO.

PATCHLEVEL2::

main.c:
	Added an option for turning off the BIOS routines for the
	pseudo-drives.
filesys.c:
	Moved the vector set/restore code to main.c (where all the
	other vector stuff is).
tosfs.c:
	If the _FLK cookie was already set when MiNT started, we
	pass file sharing and locking requests through to GEMDOS.
main.c:
	Turn the cursor off when leaving, if we were started from
	the desktop.
tosfs.c:
	Fixed a bug in which tos_chmode was returning an incorrect
	value.
debug.c:
	Added code for octal output to sprintf().
dosdir.c:
	Make Fsfirst() with the FA_LABEL bit set work on non-TOS
	file systems (via the file system readlabel function).
	(This used to work only when the search was restricted to
	labels only.)
various places:
	Get rid of gcc 2.0 warnings.

PATCHLEVEL1::

file.h:
	Because Fmidipipe and the disk change code can close
	files other than the files of the current process,
	the device driver "close" function needs another
	parameter, namely the process id being closed; this
	allows device drivers to remove locks properly.
tosfs.c:
	Volume labels shouldn't be found by Dreaddir().
tosfs.c:
	Added file locking.
filesys.c, main.c, file.h:
	New utility routine (denylock) to make implementing file
	locking easier for file systems.

PATCHLEVEL0::

tosfs.c:
	Canonicalize file names (i.e. convert to 8.3 format).
	Also, keep track of the value returned from the last
	readdir() call, so that a subsequent Fxattr() will take
	place quickly.
proc.c:
	In sleep(), make sure interrupts are disabled while queue
	manipulations are occuring.
bios.c:
	Correct a stuttering problem for ^C and similar interrupts.
dosmem.c:
	8 character process names weren't terminated properly.
tty.c:
	Aaargh! Shift+cursor keys were being interpreted even when
	they shouldn't have been.

version 0.93

PATCHLEVEL6::

filesys.c:
	Check for newly installed drives when parsing an
	absolute path without an explicit drive letter, as
	well as when looking at ones with drive letters.

PATCHLEVEL5::

biosfs.c, fasttext.c:
	Allow TIOCGWINSZ calls on the console (we use the line A
	variables to get the number or rows and columns).
filesys.c:
	Fix a typo in the file system initialization checking.
pipefs.c:
	Make "VIRGIN_PIPE" more obviously a magic value, and
	document it.
pipefs.c:
	Make u:\pipe have a sensible date/time; also, make
	Dfree on u:\pipe return some useful statistics about
	the number of pipes in the system.
procfs.c:
	u:\proc has a sensible time and date now, namely the
	time/date of the last process creation or destruction.
dosfile.c:
	Fcreate() of a volume label now returns a handle to
	u:\dev\null.
dosmem.c:
	Make sure the BIOSBUF buffer is flushed when terminating.
main.c:
	There's a bug in TOS 1.4: GEM seems to assume that all
	memory is zero initially, and if it isn't (e.g. if a large
	AUTO folder program like MiNT terminates and leaves behind
	dirty memory) then having too many (or the wrong kind of)
	desk accessories can lead to a crash. This was a real bear
	to track down, and the work-around is very ugly; before
	MiNT exits we copy a short machine language subroutine into
	the command line, and then execute it; the routine zeros
	all of the TPA and then does a Pterm0().
rendez.c:
	Change a "short" to "int" for the benefit of gcc 2.0.
bios.c:
	Stop process dumps from stuttering.
console.c:
	Added support for global file handles.

PATCHLEVEL4::

dosfile.c:
	In Fselect(), we have to re-validate file handles after
	a sleep() call, since signal handlers may close files.
proc.c:
	Pre-allocate more PROC structures (this should help
	reduce memory fragmentation).
tty.c, file.h:
	Allow cursor/function keys to send escape sequences.
dosdir.c:
	As suggested by S. Henson: Dsetpath through a symbolic link
	may also require changing the current drive as well.
proc.c,dos.c,timeout.c:
	New process scheduling algorithm, as suggested by A. Pratt.
dosdir.c:
	Make only the low bit of Dlock() significant, for future
	expansion.
dosfile.c:
	Allow Fcreate() to create a global file handle.

PATCHLEVEL3::

debug.c:
	Changed TRACE mode output so that not just any keys will
	start/stop output, but only Help and Undo.
dosdir.c, filesys.c:
	Add a Dlock() system call to lock/unlock drives.
filesys.c:
	Only initialize drives if the BIOS drive map says that
	they exist.
dosmem.c:
	In Pexec, make a copy of any name we're going to use
	before freeing memory for overlayed programs; the old
	way was decidedly incorrect!
dosfile.c:
	Allow for global file handles, so that shared libraries
	can use file handles that are the same for all processes.
dosmem.c:
	In Mxalloc, ignore bits that we don't understand, to
	allow for future expansion.
syscall.s:
	Fix a bug that could cause the wrong system call to be
	made if BIOS buffering is on (!).
bios.c:
	Streamline the BIOS buffering mechanism, and make it
	more conservative about multiple processes doing Bconout
	output.
procfs.c:
	Allow "foo.-1" to stand for the current process, and
	"foo.-2" to stand for our parent. Also, add new
	Fcntls for getting/setting memory flags.
bios.c:
	In Setexc(), don't actually change any vectors, let the BIOS
	do it -- some TSR's install trap handlers that look for
	certain Setexc functions...
signal.c:
	Allow nested Supexec() calls, or Supexec()'s from a terminate
	vector.
procfs.c:
	Change the definition of PPROCADDR and add a new Fcntl,
	PCTXTSIZE.
mem.c:
	In exec_region, set the stack based on the value of p_hitpa
	from the basepage, instead of the size of the memory
	region -- some programs rely on being able to set the initial
	stack pointer for a Pexec(4,...) this way.
main.c, context.s:
	Avoid using 68020 instructions if we're on a 68010.

PATCHLEVEL2::

dos.c,proc.c:
	More tweaking of the priority code.
main.c:
	Change the type of "tosbp" from char ** to BASEPAGE **,
	since that's what it really is.
main.c:
	Add a special case for the Spanish TOS 1.0 act_pd variable.
pipefs.c:
	When a writer is waiting to write a small amount of data
	atomically, remember to wake up readers so that they
	can clear the pipe!
debug.c:
	Add the %u flag to ksprintf() (Fselect uses it, maybe others
	do too...)
dosmem.c:
	In Pterm(), put the exit code onto the stack when calling
	etv_term. It won't be in the same place as it was for TOS,
	but c'est la vie. (People asked for this feature...)
xbios.c:
	Provide a way to pass arguments to Supexec(). Note that Atari
	never documented that this was possible, but some people were
	relying on it anyway :-(. (Don't use this feature, it's only
	there as a compatibility hack.)
main.c:
	In shutdown(), don't bother waiting a second for processes
	to finish if there are no other processes.
filesys.c:
	Make sure that path names are null terminated after strncpy.
mem.c:
	Fix the code to zero process registers so that it *only* zeros
	process registers.
dosmem.c:
	Eliminate some redundant code.
dosfile.c:
	Open u:\pipe\sys$pipe.xxx rather than q:\sys$pipe.xxx.
main.c:
	Change a "malloc" into "kmalloc", and restore the #include
	of <minimal.h> that was inadvertently deleted.
main.c:
	Allow parameters to be passed to the initial program specified
	by the INIT= string.

PATCHLEVEL1::

main.c:
	Fix a typo in shutdown() that was causing problems when
	MiNT was shut down while processes were active.
tosfs.c:
	Make sure that tfullpath() returns a string less than
	PATH_MAX characters long.
everywhere:
	Replace "sprintf" with "ksprintf".
debug.c:
	Add a "ksprintf" function that's like sprintf(), but
	(a) doesn't have so many features (making it smaller),
	and more importantly (b) won't try to write more than
	SPRINTF_MAX characters into a buffer.
filesys.c:
	In path2cookie, make sure we don't try to copy more than
	PATH_MAX characters into the fixed size buffers.
dosmem.c:
	The "sleep if no memory available during Malloc" code
	was causing more problems than it solved, so it was
	removed. To compensate, we increase the priority of
	newly Pexec'd processes to make sure that they get
	to run.
dosmem.c:
	Aaaargh! A very serious screw-up in terminate() was
	causing us to wake up processes sleeping in vfork()
	even when their children were still using the address
	space; needless to say, horrible (and mysterious)
	crashes could ensue. Fix: only force the parent awake
	if wait_q == WAIT_Q && wait_cond matches the terminating
	process, otherwise let post_sig() handle waking.
	While fixing this bug, re-arrange the terminate code
	to do the waking up at the very end, just in case some
	of the other code may cause a sleep() temporarily.
bios.c:
	Fix the scan code for the UNDO key.
fasttext.c:
	Use Setscreen() to set the hardware screen base, since setting
	the variable at 0x45e causes TOS to keep setting the screen base
	ad infinitum.

PATCHLEVEL0::

rendez.c:
	When waking a process up from a semaphore, check to see
	if it's on the WAIT_Q before trying to remove it from
	that queue (it might have been moved off the wait queue
	by a signal).
bios.c:
	Make sure that Bconout(2,c) always succeeds, to compensate
	for text accelerators and other programs that don't return
	sensible values from Bconout. Also, ignore the Bconout
	return value when flushing the text output buffer.

version 0.92

PATCHLEVEL4::

biosfs.c:
	Provide devices for the extra Mega STe serial ports.
biosfs.c:
	Make the kernel info structure available to device drivers
	loaded with Dcntl.
xbios.c:
	Provide a modified Midiws function so that this is also
	affected by Fmidipipe and Fforce.
biosfs.c:
	Split bios_device into two device drivers; one for
	terminal devices, and one for plain character devices
	(the printer and IKBD port fall into this category).
	Also: provide a new Dcntl call to install plain BIOS
	devices in U:\DEV.
tty.c:
	Check for terminal start/stop keys while reading.
bios.c:
	In checkkeys, loop through all keys received since our last
	interrupt, rather than just checking the last thing in the
	buffer (as A. Pratt suggested).
bios.c, tty.c:
	Made the "disable" character for special terminal functions
	(e.g. the EOF key) be 0 instead of -1; this matches System V,
	is more POSIX friendly, and also makes confusing function keys
	and ^@ less likely. (Thanks to Scott Willingham for this
	suggestion.)
file.h, elsewhere as needed:
	Renamed the O_BIOS flag O_TTY (since that's what it really
	represents) and renamed the is_bios macro is_terminal.
dosmem.c:
	Make Pexec mode 106 cause the child to be truly independent
	of the parent (i.e. it doesn't get the parent's address space,
	nor does the parent get the child's).
biosfs.c:
	Allow symbolic links from U:\DEV; this lets us do things like
	Fsymlink("U:\PIPE\SERVERFIFO", "U:\DEV\SERVERDEV").
main.c:
	When PRN=d:\foo is specified, create the file foo instead of
	just trying to open it; this makes no difference to devices,
	but makes redirecting printer output to a file much more
	convenient.
unifs.c:
	Fix a bug that was causing Dgetpath() to return incorrect
	information for U:\A.
timeout.c:
	Make sure "searchtime" is up-to-date; bconout uses this for
	the time out.
biosfs.c:
	Fix bios_write so that if bconout fails, so does the write.
bios.c:
	Fix bconout so that it doesn't hang forever if the device isn't
	going to be ready (e.g. the printer is off); instead, there's
	a 10 second timeout.
main.c:
	Send all processes SIGTERM when we're shutting down, so that
	they have a chance to clean up after themselves.
mint.h:
	The KBDVEC structure was missing the "clockvec" element (!).

PATCHLEVEL3::

biosfs.c:
	Revised to allow support for loading/removing device drivers
	dynamically, via a Dcntl() call.
dosmem.c,mem.c,dosfile.c,file.h:
	Added support for setuid/setgid. These bits are only checked
	in Pexec modes 0, 100, and 200, i.e. the "load and go" modes.
rendez.c:
	Added new semaphore code from Allan Pratt.
main.c:
	New command for mint.cnf: "exec foo.prg bar" runs the program
	"foo" with argument(s) "bar".
main.c:
	Use the XBRA protocol for all interrupt routines that we grab.
filesys.c:
	When terminating MiNT, close all open files to make sure data
	is flushed and devices are nicely shut down.
main.c:
	Add some more variables, such as CON and PRN for redirecting
	those handles, and HARDSCROLL for controlling the fast text
	output.
proc.c:
	Make sure the "links" field for the prn and aux handles is
	correct.
syscall.s, bios.c:
	Special case the BIOS Bconout code to try to speed it up
	a bit. We allow for buffering of Bconout output; the buffer
	is flushed on the next non-Bconout system call or context
	switch. This should usually work OK, but as a precaution
	we provide for a way to turn it off (BIOSBUF=NO in mint.cnf).
fasttext.c.fasttext.h:
	New files for a faster text output device; changes were
	made to biosfs.c to support this, too.
tty.c:
	Streamline writes to terminals by sending data to the
	tty device in chunks instead of 1 character at a time.
dosfile.c:
	In do_open, always return EFILNF, never EPTHNF.
dosmem.c:
	Use supexec() to execute the terminate vector code, to
	avoid duplication of signal 0 faking.
xbios.c:
	In Supexec() does leave the kernel, so we have to make
	appropriate adjustments. We do this by faking a signal
	(signal 0) and installing the user's function as a signal
	handler.
dosdir.c:
	Make Dfree(x) actually look at free space on the drive which
	corresponds to the current directory on <x>; this should make
	Dfree on drive U: much more useful.
proc.h:
	Make the "base" field of the PROC structure have type BASEPAGE *
	(since that's what it is!)
basepage.h, dosdir.c, dosmem.c:
	Support some undocumented fields in the basepage a little bit
	(i.e. they're read only). Programs that try to write to these
	fields break. Surprise, surprise.

PATCHLEVEL2::

dosmem.c, mem.c:
	The docs say that children started with Pexec(104,...) or
	Pexec(106,...) share the parent's memory. This was unfortunately
	not the case; if the parent exited and the child was running
	in the parent's address space (e.g. see tfork() in mntlib)
	the child died very soon thereafter (like when the next program
	comes along and clears the memory the child was running out of).
	This is now fixed.
dos.c, proc.c, timeout.c:
	More tuning of the process scheduler.
main.c:
	Added "setenv" function for mint.cnf.

PATCHLEVEL1::

filesys.c:
	In some circumstances, AHDI will keep telling us that a drive
	has changed, ad infinitum. To avoid this, we stop trying after
	8 media changes occur in a row.
util.c:
	Tuned the kmalloc() strategy to reduce memory fragmentation
	(every process will be allocating 264 bytes for its
	memory region maps right after creation, and this should
	come from kernel memory).
tty.c:
	Under TOS, 1 byte writes should always be in raw mode.
dos.c:
	In Syield(), we should call sleep() even if no other processes
	are waiting, just to make sure that signals, alarms, etc.
	are properly dealt with.
filesys.c, dosfile.c:
	The media change code was wedged (actually, the fault was in
	do_pclose, which sometimes neglected to check to see whether
	or not the file had a still-valid device driver).
dosmem.c:
	In the termination code, close "files" referring to a process
	*before* freeing all the process memory; that way, we don't
	have to worry in do_pclose() and other places about what
	kind of state the process is in.
mem.h:
	Round off memory regions only to a word boundary for better
	TOS compatibility.

PATCHLEVEL0::
dos.c,intr.s,syscall.s:
	Changed s_yield() to actually give up the processor if
	another process is waiting for it; this means that processes
	that call Syield() won't be penalized by the priority code.
	Also: added a new kernel function, preempt(), which does
	what the old s_yield() did (and hence penalizes CPU hogs).
makefile:
	Cleaned up a bit, per suggestions from A. Pratt and D. Gymer.


version 0.91

dosmem.c:
	Only the high 4 bits of the program load flags give memory
	requirements (we were using 8 bits).
dosdir.c:
	Add a hack so that ksh still works (it was using '/' in a
	path name). THIS HACK WILL GO AWAY SOMEDAY!
tty.c:
	CBREAK mode shouldn't do erase, kill, or EOF processing.
dosdir.c:
	Freadlink should check first to make sure the file really
	is a link!
file.h,tty.c:
	Change the name "struct winsiz" to "struct winsize" to match
	what Unix calls it (cosmetic change only).
unifs.c:
	Allow renaming of the drives, and allow rmdir() to work
	like unlink() for symbolic links (since we fake the return
	value from Fsfirst to look like a directory if the link
	points to a directory).
biosfs.c:
	lseek() on the null device should not return 0 always;
	otherwise, it will look like a terminal to many programs!
dosfile.c:
	If a MiNT domain process closes stdin or stdout, they
	really do want them closed (for compatibility with
	MiNT 0.8).
syscall.s:
	When returning from traps, don't pre-empt the current process
	if it's in supervisor mode.
mem.c:
	Fake some stuff in the basepage so that programs compiled
	with dLibs will work some of the time.
tosfs.c:
	Make the value returned from Dgetpath() lower case in the MiNT
	domain. Also, make tosfs a little less verbose when debugging
	or tracing is on.
dosmem.c:
	Try to allocate space for saved fork() memory in the alternate (TT)
	memory map first, as well as in core (ST) memory.
mem.h:
	Round allocation requests up to multiples of 8 bytes instead
	of 4; this automatically gives us a bit of slush for ill
	behaved programs, and also means that requests will always
	be for a multiple of sizeof(double) bytes.
util.c:
	Get rid of the extra slush around kmalloc'd regions (which
	was a lot bigger than originally intended anyway!)


version 0.9

PATCHLEVEL21:: released version

dosmem.c:
	Make Malloc and Mxalloc try again if there isn't enough memory;
	maybe the situation is temporary.
mem.c:
	Plug a memory leak in load_region(); also make load_region try again
	if there isn't enough memory to load the program (just in case the
	situation is temporary).
dosdir.c:
	Add a check to Fattrib to make sure that attributes of directories
	are never changed.

PATCHLEVEL20::

dosdir.c:
	Allow Frenames of processes and other special kinds of files even
	if they do have the FA_RDONLY bit set.
dosfile.c:
	Allow creation of files with the read-only attribute.
tosfs.c:
	Change the file deletion code so that an attempt to delete an
	open file no longer fails, but rather marks the file to be
	deleted when it is closed.
file.h:
	Add some extra space to the tty struct, for future expansion.
filesys.c,main.c:
	Make sure the fake BIOS disk routines are available before
	any of the pseudo-drives are used, by having them set up
	in init_filesys() instead of init_intr().
tosfs.c:
	Remove some debugging output that isn't needed anymore.

PATCHLEVEL19::
Beta release.

intr.s,main.c:
	provide some fake BIOS disk routines for the pseudo-drives,
	in hopes of avoiding "drive U: is not responding" types of
	messages that some have reported
pipefs.c:
	half.ttp was failing under mgr, because of a race condition:
	our select() returns "ready" for a pipe if nobody exists to
	write to it (since then a read will return immediately). half
	would make a pipe that would end up being destroyed immediately
	by mgr before it got attached to a process. Solution: pipes that
	have *never* been opened yet for writing get a special marker
	and select doesn't worry about them, only about ones that were
	once written to.
pipefs.c:
	Fixed FIONWRITE to return the correct value.
dosdir.c:
	Refuse to Frename a file with the FA_RDONLY attribute.
biosfs.c:
	Fixed bios_write to return the number of bytes successfully
	written.
bios.c:
	LAST_DEVICE was inaccurate. This could happen again, so I'm simply
	getting rid of it and leaving all errors to the BIOS.
pipefs.c:
	Make sure the FA_RDONLY attribute is sensible (i.e. unidirectional
	pipes that don't have a writer can still be written to).
filesys.c:
	Fixed relpath2cookie so that it doesn't *always* follow symlinks
	(it only should when lastname == follow_links)
dosfile.c:
	If the FA_RDONLY bit is set on the file, even the superuser should
	be denied access for writing.
dosfile.c:
	Requiring write permission for Fdatime is a Bad Idea, since GEMDOS
	doesn't; so now MiNT doesn't either.
tosfs.c, filesys.c:
	Fixed a bug with media changes (Fsfirst would sometimes try to close a
	directory that had already been automatically closed by a media change).

PATCHLEVEL18::

main.c:
	Fixed the machine type detection code; it needs to run before
	biosfs is initialized, i.e. before init_filesys().
main.c:
	Provide a configuration file so that users can automatically
	setup symbolic links and can change their init program.
biosfs.c:
	Allow rename on bios devices, so people who want terminals called
	"ttyX" instead of "modemX" can do so.
dosdir.c:
	Flink shouldn't need write permission on the destination
	directory, only the source.
dosfile.c:
	Added FSTAT function for Fcntl, to allow a better version of
	fstat() for the library.
dosfile.c:
	Add code to fcntl to automatically convert MiNT 0.8 O_NDELAY
	into MiNT 0.9 O_NDELAY. This is a temporary measure only,
	to let older versions of mgr continue to work for a while.
filesys.c:
	Symbolic links with relative paths were always failing with
	ELOOP. Oops! (Thanks to Stephen Henson for catching this.)
file.h, tosfs.c, dosfile.c:
	Added a new flag, FS_NOXBIT, to control whether or not the
	file system has a sensible notion of execute permission.
	This removes an ugly check for &tos_filesys.
mint.h,util.c,mem.c:
	Added a compile time option, JUNK_MEM, to deliberately fill
	the memory MiNT acquires with garbage; this is for debugging
	(to help track down silly failures to initialize memory) and
	not for production code.
proc.c:
	Fixed a typo in init_proc() that was causing memory not to
	be initialized to 0 correctly. (Thanks are due to Stephen
	Usher for catching this one.)
tosfs.c:
	Added a tos_rewinddir that works.
file.h:
	Added blocks and blksize fields to the XATTR structure, and
	provided a few extra reserved fields for future expansion.
	(Also: re-arranged some fields to match what the gcc library
	already has.)
file.h, main.c:
	Add sleep, wake, and wakeselect to the kernel info structure;
	some device drivers will need these.
biosfs.c:
	Make nodskchng do a Getbpb on the (non-existent) device; the officially
	documented way of forcing a disk change requires this.
file.h,filesys.c,*fs.c:
	Remove the "flag" argument from the dskchng function, and
	have the kernel check Rwabs for E_CHNG; this should save
	a lot of duplication in user file systems, since everyone
	really has to do this anyways.
dosdir.c:
	Make sure that Fsfirst names can be null-terminated.
filesys.c:
	Oops: a misplaced bracket in disk_changed was causing
	write-protected disks to always appear to have changed!
tosfs.c:
	Made it illegal to delete or truncate an open file.

PATCHLEVEL17::

version.h:
	I think we can call this version an "alpha" one, now. No more
	major features remain to be added (fingers crossed, here).
filesys.c,dosdir.c,*fs.c,file.h:
	Media change detection code; this is now the kernel's
	responsibility. This necessitated an additional function
	for file systems; I hope this is the last one.
main.c,biosfs.c:
	Check what kind of machine we're on, and adjust what devices are
	present accordingly. The rs232 file has been renamed to "modem1".
	WARNING: This will break existing code that uses the name "rs232".
filesys.c:
	Code for loading file systems (finally!)
bios.c,context.s:
	Made Rwabs, Getbpb, and Mediach save registers (since device
	drivers often don't, and loadable file systems will be calling
	these directly).
main.c:
	Implemented the "struct kerinfo" to pass information to loadable
	file systems.
filesys.c:
	Re-wrote path2cookie to provide for symbolic links; a new routine
	(relpath2cookie) helps us out.
unifs.c:
	Code for creating, reading, and deleting symbolic links.
*fs.c, dosfile.c, file.h:
	Changed the way file opens and creates are done; the former
	(*getdev) routine for file systems has been split into
	(*creat) and (*getdev), both of which are quite a bit simpler.
	This whole scheme is clearer, less work for the file system,
	and will support symbolic links much better.
various places:
	Add security checks. This is still pretty sad, but at least it
	can provide one with a modicum of protection against silly
	mistakes.
dosfile.c:
	Require write permission on a file before changing its date via
	Fdatime.
tosfs.c:
	Cleaned up and streamlined a bit, and fixed tos_readlabel.
*fs.c,dosdir.c,file.h:
	Changed the file system "getxattr", "chmode", "chown", and
	"chattr" functions to take a single file cookie instead of a
	(directory, name) pair. This should make most uses of these
	functions (e.g. in name lookups) more efficient. Also,
	changed the readdir() function to return a file cookie to go
	along with the newly read file name.
main.c:
	If "init.prg" isn't found, try starting GEM instead.
unifs.c:
	Re-arranged to allow for symbolic links.
filesys.c:
	Implemented some media change routines.
dosdir.c:
	Added Fchown and Fchmod system calls.
dosdir.c:
	Added security check for Fattrib().

PATCHLEVEL16::

lots of places:
	Try to make TRACE() and DEBUG() messages more useful for people
	who don't know the internals of the kernel, and who just want to
	debug their own programs.
dosdir.c:
	Added Flink, Fsymlink, Freadlink, and Dcntl system calls.
*fs.c,file.h:
	Added a new mode to Dpathconf() to determine whether the
	file system uses DOS type file naming conventions, ordinary
	Unix type, or _POSIX_NO_TRUNC type.
file.h:
	Add an "fscntl" field to the file system structure.
tosfs.c:
	Fix the mode values returned from getxattr() (regular files
	have type S_IFREG, not S_IFMT).
proc.c:
	Zero the child's srchdta field after fork_proc(); otherwise,
	the accounting for Fsfirst/Fsnext can get messed up. Thanks
	again to S. Henson.
mem.c:
	As Steve Henson pointed out, resetting the effective user and
	group id's in exec_region is probably a Bad Idea.
dosdir.c:
	Change Dopendir/Dclosedir to use umalloc and ufree instead of
	kmalloc and kfree.

PATCHLEVEL15::

dosdir.c:
	When terminating, clean up after any Fsfirst/Fsnext sequences that
	didn't go to completion.
tosfs.c:
	Streamlined garbage collection code, and also corrected a bug in
	which file indices used in directory searches could be garbage
	collected.
file.h, *fs.c:
	Add symlink and hard link functions.
pipefs.c:
	Make FIONWRITE work again (a line was accidentally deleted).
	Make sure that Fselect() will select any pipes that have been
	closed.
dossig.c:
	Put back the user id check in Pkill.
dos.c, proc.c:
	Make sure that the "euid" and "egid" fields are set with
	the Psetuid and Psetgid calls. Also, make sure the fields
	are reset after an exec.
mem.c:
	Make exec_region shrink the process 'mem' and 'addr' tables
	to the default again if extra regions had been allocated.
dosmem.c:
	Get rid of the magic number "100", and introduce a maximum user
	settable priority MAX_NICE so that the kernel can make sure
	that a process that needs to run (e.g. an aborted vfork) will
	run first by setting its priority to MAX_NICE+1.
proc.c:
	Make sure the initial process memory tables are zeroed.
proc.c:
	Adjust the process scheduling algorithm (yet again!). Also,
	rename "nice_count" to "curpri".
dosdir.c,dos.c:
	Added Dopendir, Dreaddir, Drewinddir, Dclosedir system calls.
*fs.c:
	Made readdir return a file index (inode number) if it's not
	doing a TOS mode search.
biosfs.c:
	PHYSCONS is such an ugly name; CONSOLE makes more sense.

PATCHLEVEL14::

mem.c:
	Allow the kernel to dynamically allocate memory region
	descriptors if it runs out; also, increase the number that
	it starts with by default.
util.c:
	Made it harmless to call kfree with a NULL argument.
proc.h,mem.c,dosmem.c,proc.c:
	Eliminate the 64 region per process limit, by making the "mem"
	and "addr" arrays dynamically allocated.
proc.c:
	Change the code for selecting which process to run next; if more
	than one process is on the ready queue, we use a per-process
	counter to prevent high priority processes from hogging all the
	time.
dosmem.c:
	Release a process' controlling terminal (by setting it's process
	group back to 0) if the process is a process group leader and
	is exiting.
dosfile.c,tty.c,*fs.c:
	Made do_open set terminals up correctly on open/close, and
	handle assigning process groups to them. Also, made the terminal's
	process group be set automatically on Fforce(-1,...).
main.c,timeout.c:
	Added AKP's code for better resolution of time usage.
DELETED FILES:
	xlate.c, xlate32.s, newdisk.s
everywhere:
	Removed all references to NEED_TRANSLATION. This is getting to be a
	pain to maintain, and nobody seems to actually use it.
*fs.c:
	Fixed the ENAMETOOLONG detection code in readdir (thanks, Steve!).
timeout.c:
	New function, nap, for processes that are in busy loops waiting for
	an event that probably won't happen for a while (e.g. waiting for
	the user to hit a key); use e.g. nap(60) to sleep for 60 milliseconds
	instead of yield().
mem.c:
	create_env() should use the value from the current process' basepage,
	since this may *not* be the same as the environment the process
	was actually started with
dosfile.c:
	Make Fcntl(fh, arg, F_SETFL) leave the file sharing mode alone as well
	as the read/write mode.
unifs.c:
	Change the name "fifo" to "pipe"; change "drva", "drvb" etc. into just
	"a", "b" etc.
dosmem.c:
	Make it possible to provide a name with Pexec mode 104. Provide a new
	mode 106 that starts a process in the background and automatically
	detaches the process TPA from the parent's memory.

PATCHLEVEL13::

biosfs.c:
	Made sure that tty_getchar() won't see (long) negative values
	returned from a successful read, by clearing the high bit
	of read values.
*fs.c,atarierr.h:
	Made file systems responsible for dealing with "." and "..";
	introduced a new (fake) EMOUNT error to indicate when ".." is
	found in a root directory (this is for the benefit of the
	unified file system code)
dosdir.c,filesys.c:
	Changes to allow for the unified file system.
unifs.c, makefile:
	New file, for a "unified" file system.
filesys.c, *fs.c:
	Renamed denyaccess() to denyshare().
dosdir.c:
	Changed getname() to work from the root down instead of from
	the directory up; this should work better for mounting and
	symbolic links.
dosdir.c:
	Moved the check for a drive specifier (A:\FOO) in Dsetpath to
	where it should have been, namely before any use of the drive.
biosfs.c,pipefs.c:
	In opendir, make sure the directory structure is properly
	initialized.
dos.c:
	Changed snice and srenice to pnice and prenice; also modified the
	return values to be 16 bit (for the normal case), and 32 bit
	negative for errors, so that low priority processes can be
	distinguished from errors.
debug*.c:
	The Bconstat() check for the printer should be applied to device
	0, not 1.

PATCHLEVEL12::

dosdir.c,filesys.c:
	Re-wrote Fsfirst/next to use opendir/readdir/closedir. Re-wrote
	the pat_match function to work correctly (at least, according
	to the TOS rules :-).
*fs.c, file.h:
	Added opendir/readdir/closedir calls to file systems to allow
	more general file systems; also changed getattr into getxattr
	(again, to allow file systems with extra goodies), setattr into
	chattr, and added chown and chmod calls. Deleted sfirst/snext
	file system entry points, and the Xsfirst/Xsnext system calls.
*fs.c,file.h,dosfile.c,dosdir.c:
	Changed file systems to have separate calls for reading/writing
	volume labels. Added checks to Fattrib and Fcreate to avoid creating
	files with bad attributes (e.g. FA_LABEL or FA_DIR and anything
	else).
main.c:
	Change the definition of tosvers so that TOS 1.0 corresponds
	to tosvers == 0x100, not tosvers == 0. Also, clean up the
	code for testing TOS versions.
	WARNING: This may break RAM TOS versions. I doubt it matters.
bios.c,main.c:
	Always set the kbshft variable, so that kbshift is more
	efficient.
dos.c:
	Eliminated the old code that allowed Super(-1L) to work (GEMDOS
	doesn't support this, so why should MiNT?)
dos.c:
	Added GEMDOS date and time routines, and made sure that
	datestamp and timestamp are initialized properly when
	MiNT is started.
mem.c:
	Increased the size of the buffer used for reading relocation
	information in load_region.
*fs.c, dosfile.c:
	Changed the filesystem getdev call to return a file cookie
	(this saves a call to lookup on every open).
*fs.c, filesys.c:
	Eliminated static variables, changed all routines that used to
	return pointers to cookies to take an extra argument (a pointer
	to the place to put the result).
tosfs.c:
	Turn O_COMPAT sharing mode into O_DENYNONE (after making other
	appropriate changes to the access modes).
debugold.c:
	Updated to reflect changes in debug.c.
debug.c:
	Added calls to va_end where appropriate.
debug.c:
	Before, hitting a key paused debugging output; now, debug_ws
	checks the device that output is going to, so that e.g. if it's
	going to the MIDI port, the output is paused when a character
	arrives on the MIDI port.
mem.c:
	Made exec_region use O_DENYNONE sharing mode instead of O_DENYW

PATCHLEVEL11::

dosfile.c:
	Forbid closing file handles < 0; this will prevent accidental
	destruction of the BIOS handles.
dosfile.c:
	Change Fbiosdev to be MIDI specific, rename it to Fmidipipe, and
	move it to dosfile.c. The semantics are a bit different, too;
	see the comments in dosfile.c.
bios.c:
	Really fix the MIDI output routines, this time. (sigh)

PATCHLEVEL10::

signal.c:
	Fixed a typo in the message printed when bombs occur. Also,
	removed the copying of data from the supervisor stack to the
	BIOS area -- this was causing very strange problems, and it's
	not clear that the info would be useful under MiNT anyway.
	Finally, all this is only supposed to happen for certain
	signals, not for any random killings.

PATCHLEVEL9::

file.h, *fs.c:
	Changed the definition of the DTA buffer to free up space for
	user/group id fields and an extended attributes field. Made
	sfirst/snext use the 'aux' field of the directory cookie
	as an index.
dos.c:
	Fixed Talarm() to return the number of seconds left before an
	alarm, not the number of milliseconds.
dosdir.c:
	New system calls, Xsfirst/Xsnext, for accessing file systems
	with long (>12 character) names.
signal.c:
	Fill in the BIOS post-mortem dump error correctly after
	bus errors, address errors, etc. Also, made the "bomb" replacement
	routine give the process basepage address and program counter,
	as suggested by AKP.
tosfs.c:
	Fixed the tos_lookup bug that was causing bus errors during file
	opens.

PATCHLEVEL8::

tosfs.c:
	Made opens with O_COMPAT sharing mode always open for both reading
	and writing; this is so broken TOS programs that write to read-only
	handles will continue to work.
file.h, tty.c:
	Added TIOCGWINSZ/TIOCSWINSZ and the appropriate window size
	fields to the tty structure to support them.
dossig.c:
	Remove user id checks (for now). Make it impossible to catch
	SIGSTOP.
bios.c:
	Fix so Bconout returns a value (it really should, at least for
	the printer).
mem.c:
	Don't context switch and retry alloc_region; file systems and some
	parts of the kernel aren't expecting the context switch, and besides
	the previous change makes this tactic less likely to be helpful.
mem.c:
	Don't allocate *all* of the memory to the basepage, leave some for
	the kernel and other programs.
pipefs.c:
	Add a check for broken pipes when a program is trying to write
	atomically.
dosmem.c:
	Block job control signals during a vfork instead of ignoring
	them; this will result in the "right" thing happening after
	the exec (since the blocked signals will then be unblocked).
tosfs.c:
	Eeek! Fixed a very serious bug in the garbage collection
	routines ("i" was used where "j" should have been in a loop:
	result: things could be garbage collected that shouldn't
	have been!)
procfs.c:
	changed the return value from "dfree" to more accurately indicate
	the free memory in the system, and to also provide information
	about the smallest unit of allocable memory (currently a longword)
*fs.c,dosfile.c,dosdir.c,filesys.c:
	instead of passing fcookies to file systems, pass pointers to
	them; this should slightly improve efficiency, and greatly
	improve portability (otherwise, compilers used to make
	installable file systems would have to have the same structure
	passing/return conventions as the one that compiled the kernel)
dos.c:
	new system call, Srenice(), to change priority of a different
	process
dos.c:
	change Fbiosdev() system call to take a pid argument
proc.h, dosfile.c:
	add per-file descriptor flags for things like "close on exec"
file.h, mem.c, *fs.c:
	new file open mode, O_EXEC, for the kernel to use in Pexec
rendez.c, dos.c:
	new file from AKP to implement a simple and fast message based
	IPC; the new system call is Pmsg. Also note that the syscall number
	of Pmsg is 0x125, which used to be used by Fbiosdev; Fbiosdev has
	been moved to 0x126.
filesys.c:
	applied Steve Henson's patches to improve path2cookie's handling of
	repeated slashes
proc.h:
	MAX_OPEN should be 32, not 20!
mem.c:
	Ignore "close on exec" flag for the standard handles (for some
	reason, bash manages to set these for 0,1,2; this is probably a bug
	in the port of bash, but on the other hand it's unlikely that
	anyone would really want to close the standard handles when doing
	an exec, anyway)
tty.c:
	Fixed RAW mode reads on terminals so that they're no longer
	terminated by '\r' or '\n' (and so that pty slaves aren't forced
	to read just 1 character at a time). Thanks to AKP for catching
	this.

PATCHLEVEL7::

*fs.c:
	Cleaned up the Dpathconf() return values to better reflect
	reality, and made the code a little easier to understand.
bios.c:
	Adjust bcostat() parameters so that V:\MIDI and V:\KBD call
	the right (wrong) device (BIOS devices 3 and 4 are mixed
	up for Bcostat).
dosmem.c:
	Made sure that Malloc(0L) always returns a NULL pointer.
dosfile.c:
	Made Fclose() of handles 0, 1, 2, and 3 restore the default
	mappings. (Apparently TOS _does_ do this, after all.)
bios.c:
	AHDI 3.1 added a new parameter to Rwabs; we now pass that
	along too.
timeout.c:
	Make canceltimeout() free the memory used by the time out
	descriptor. (another Fselect bug)
signal.h:
	Removed ABORT and ALARM from list of signals that are reported
	by the kernel.
proc.c:
	Moved checkalarms() to do_wakeup_things() so that short time outs
	will be properly recognized; this fixes a nasty bug in Fselect.

PATCHLEVEL6::

pipefs.c:
	Make writes of 1024 or fewer bytes atomic. Also, increase pipe
	buffer size to 4096.
tosfs.c:
	Make O_EXCL and O_TRUNC bits useful.
tosfs.c,pipefs.c,filesys.c:
	Fully implement file sharing modes for tosfs and pipefs. A new
	routine (denyaccess) is provided in filesys.c for checking
	file open modes and determining conflicts (if any).
pipefs.c:
	If a process writes on a broken pipe while ignoring SIGPIPE,
	the write now returns -1. (Thanks, Stephen)
debug.c, bios.c:
	Applied bammi's patches to PATCHLEVEL 5 to fix some typos.

PATCHLEVEL5::

debug.c, bios.c:
	Applied AKP's debugging output patches, to allow TRACE and
	DEBUG output to go to serial ports as well as the printer.

PATCHLEVEL4::

dos.c:
	NEW SYSTEM CALL: Fbiosdev() to control redirection of BIOS
	devices.
bios.c, proc.h:
	Added binput and boutput arrays to allow for per-process redirection
	of BIOS device input and output to GEMDOS file handles.
biosfs.c:
	Changed "mdi" to "midi".
	WARNING: this change could (I suppose) break existing code.
util.c:
	Added a umalloc() function to allocate memory in user space,
	and modified the various sfirst routines to use this to
	allocate space for patterns instead of kmalloc.
dosdir.c,file.h:
	Added an FS_CASESENSITIVE flag to control conversion of file
	names to upper case for TOS domain processes.
dosdir.c, *fs.c:
	Made sfirst/snext functions take an extra argument, the length
	of the file name field in the DTA buffer (so that we can provide
	Xsfirst/Xsnext functions that can work with longer names)
mem.c:
	Fixed exec_region so that the close-on-exec flag works.
filesys.c:
	Made path2cookie take the name of the place to store the last
	component of the path name as an argument (instead of always
	storing it in the global variable temp1).
biosfs.c:
	Added code for O_NDELAY on bios devices.
tosfs.c:
	Cleaned up garbage collection a bit -- I hope this fixes the
	problems with running out of indices.
filesys.c:
	Returned the special parsing code for CON:, AUX:, etc.
file.h:
	OOPS! The flock structure was missing an element (l_whence). It
	was added.
	WARNING: This change may break existing code.
util.c:
	Made kmalloc take a long parameter, just in case installable
	file systems need lots of memory.
file.h, atarierr.h, pipefs.c:
	Made file modes compatible with _FLK specification. Also
	added the ELOCKED and ENSLOCK errors to atarierr.h, and made
	pipefs.c use ELOCKED instead of EACCDN.
	WARNING: this *will* break existing programs. In particular, mgr
	no longer works :-( because O_NDELAY has changed. (this was
	temporarily patched)
dos.c,dosfile.c:
	Added Flock() system call.
mem.c:
	Made the initial user stack pointer low enough so that syscall.s
	won't run into the end of memory if the user makes a system call
	right away and doesn't push many parameters (the code in syscall
	always tries to copy a large chunk of the caller's stack).
dosmem.c:
	Made vfork'd processes ignore job control signals (thanks to
	Stephen for pointing out how some shells rely on BSD's similar
	behaviour).

PATCHLEVEL3::

dosfile.c, file.h, *fs.c, bios.c:
	Changed f_select to use the new timeout mechanism, and provided
	routines in device drivers to wake up selecting processes.
proc.h:
	New queue, SELECT_Q, for processes doing "select", to match above
	changes
dos.c:
	Changed t_alarm to use the new timeout mechanism.
timeout.c,proc.h:
	Added a new "timeout" mechanism, so that processes can specify
	an action to be taken when a counter expires.
various places:
	Cleaned up TRACE and DEBUG output
proc.c:
	Set current directory based on the TOS current directory
	when MiNT is starting up.
debug.c:
	Added AKP's "trace" mode patch
filesys.c:
	Replaced strcmp() for . and .. with direct comparisons, again
	per AKP.
tosfs.c:
	Improved search performance a bit (indicies are now allocated
	at the beginning of the list, instead of at the end)
main.c, version.h:
	Introduced PATCHLEVEL for alpha and beta test versions	
util.c:
	Made kmalloc() try the kernel memory region first for small
	regions, to cut down fragmentation of the user's memory space
proc.h:
	Made the system stacks bigger, to compensate for the bigger
	contexts now that there's FPU support
dosmem.c:
	Fixed bug with Pexec mode 6 (thanks again, AKP)
biosfs.c:
	Changed FD0 to STDIN, FD1 to STDOUT, etc.
	WARNING: this change could break existing code
filesys.c:
	'/' is no longer a directory separator for MiNT domain processes
	(few were using it, and it simplifies things to be able to
	assume '\' is the only such separator).
	WARNING: this change could break existing code
all over the place:
	Changed the way directories/files are stored. We now have
	"file cookies" for directories, instead of strings. We
	also now have two directories per drive per process
	(a root and current).
minixfs.c:
	Removed from the main compile, and MINIX_FS symbol was also
	removed -- this will be a loadable file system someday
	(soon, I hope).
various places:
	Added Alex Kiernan's patches to support compilation under
	Lattice C v5
proc.h, context.s:
	Added Alex Kiernan's FPU co-processor patches. WARNING: this
	changes the layout of the proc structure in memory, and so
	breaks "ps" and similar programs.
proc.c:
	Changed sleep() to take the wait condition as an argument; this
	means that fewer things need to know the internals of the
	PROC structure
various places:
	Added AKP's T_TOSTOP flag changes
minixfs.c:
	Changed the 8K buffer in do_change to a static variable; our
	stacks aren't *that* big!
intr.s:
	Fixed a typo that was causing serious problems with the bus
	error and other exception codes on the TT (thanks for
	catching this, Allan).
dosmem.c,signal.c:
	Corrected the GEMDOS termination vector code (the system stack
	was being corrupted if the user's code returned). Thanks to
	Julian Reschke for catching this error.
===========================================================================
version 0.8

biosfs.c, pipefs.c:
	fix ^C and ^Y to send the signals to the whole process group,
	and also to make sure processes don't read these keys if
	they're turned into signals
intr.s,dossig.c:
	fix exception handlers to be more careful about the distinction
	between being in or out of the kernel
intr.s, syscall.s, main.c:
	make sure interrupts are off before changing any vectors
bios.c:
	fixed the annoying problems with CTRL-ALT-Fx sometimes leaving
	keys in the buffer
signal.c:
	forced p_sigreturn() with no signal pending to unwind the
	*whole* signal stack, in case there were multiple signals
	pending at the time the user did a longjmp() (or whatever
	prompted the Psigreturn())
dosmem.c:
	p_wait3 now supports the WUNTRACED bit; if this isn't set,
	processes stopped due to job control are *not* returned
dosmem.c:
	removed dLibs kludge -- some programs rely on p_parent being
	non-zero to tell them that they're not accessories
various places:
	cleaned up job control stuff to be more Unix like
mem.c,util.c:
	added a new memory map for the kernel -- this should ease
	the problems with programs grabbing all of available memory
mem.c,dosmem.c:
	incorporated Allan's bugfixes; alternative RAM should work now
signal.c, main.c, intr.s:
	integrated signals with normal exceptions, so that e.g.
	a bus error raises SIGBUS. This improves the survivability
	of the kernel, so that a bus error resulting from a bad
	system call parameter won't kill MiNT, just the offending
	process.
proc.c:
	kludge to let low priority processes run every so often, even
	in the presence of a high priority process that is ready to run
atarierr.h:
	ENMFIL is -49, not -47 -- so much for Abacus' docs :-)
procfs.c:
	changes to allow read/write from process space
minixfs.[ch]:
	changed lots of function parameter types to avoid promotion and
	prototype problems with 32 bit code
bios.c:
	changed IOREC to IOREC_T to avoid name conflicts with some osbind.h
biosfs.c:
	made mouse driver change the line A mouse position variables, so MGR
	will work with bigscrn and similar large screen emulators
minixfs.c:
	new version from Stephen, now supports floppies and other removable
	media
mem.c, dosmem.c, dos.c:
	added code to support new TT TOS calls Mxalloc and Maddalt, plus
	program flags for loading/mallocing in alternate memory
bios.c,biosfs.c,dosfile.c:
	changed so that bios handles 0 and 1 can be redirected just like
	handle 2 (via the new file handles -3 and -2 respectively; AUX:
	and PRN: now refer to these files, and RS232 and CENTR to the
	physical devices)
dosdir.c:
	Dsetdrv() fixed to return an error indication when one happens
dos.c:
	fixed Super() bug (thanks Stephen)
minixfs.c:
	incorporated changes to handle 1K sector sizes

=============================================================================
version 0.7

minixfs.c:
	new file, courtesy of Stephen N. Henson (olorin@tardis.cs.ed.ac.uk)
	this is still "under construction"; see minixfs.doc for more details
bios.c:
	CTRL-ALT-UNDO now raises SIGQUIT, for the benefit of people with
	foreign ROMs (some have trouble with ^\)
filesys.c:
	changed pathname resolution code so that multiple slashes in a file
	name have the same effect as single slashes. POSIX mandates this,
	and some Unix programs expect it, too
dosmem.c:
	changed do_vfork() code so that the text segment of processes is
	*not* saved in a fork() if the process has separate text, data, and
	bss segments; this saves a fair bit of memory
proc.c:
	changed the process initialization code to better deal with job
	control; also changed handle 2 to be AUX: (as under TOS) rather
	than PRN:
bios.c:
	added CTRL-ALT-F5 (show memory usage) and CTRL-ALT-F6
	(show processes)
filesys.c:
	make explicit the fact the individual file names are limited to
	14 characters
everywhere:
	change FILENAME_MAX to PATH_MAX
mem.c:
	fixed up comments and debugging/trace info for load_region
dossig.c:
	NEW SYSTEM CALL: Psigpending() returns the set of signals that
	have been sent to the process, but not yet delivered.
dos.c, dosdir.c:
	NEW SYSTEM CALLS:
	Sysconf(n) returns information about the global limits of the
	currently running version of MiNT
	Dpathconf(name, n) returns information about the file system that
	the file "name" is located on
bios.c:
	allow CTRL-ALT-C, CTRL-ALT-\, and CTRL-ALT-Z to force a SIGINT,
	SIGQUIT, or SIGTSTP, respectively, even if the terminal is in raw
	mode
various places:
	call zero() instead of bzero()
context.s,intr.s:
	changes to make MiNT TT compatible. Thanks to Allan Pratt for this!
biosfs.c, tosfs.c, pipefs.c, procfs.c:
	fsfirst/fsnext return all upper case in TOS domain now, but
	lower case (or mixed) in MiNT domain; this is to try to wean
	programmers off of the habit of assuming everything is upper case
	(and converting accordingly)
biosfs.c:
	made mouse compatible with TOS ALT-cursor keys (the Y direction was
	wrong before)
intr.s:
	IPL 7 before reboot (thanks, Allan)
version.h, main.c:
	made version numbering a bit easier (big deal)
main.c:
	AARGH! The cookie jar stuff was plain wrong (the last cookie should
	have the total number of slots, not just the ones that are free).
main.c:
	pass current environment along to init.prg, instead of forcing an
	empty environment
signal.c:
	corrected killpg() bug (wasn't checking signals, so the current
	process didn't get the signal until later)
mem.c, dosmem.c:
	made sure that all sizes would always be rounded to the nearest
	longword. Just in case they aren't, Malloc(-1L) rounds down to the
        next smallest longword.
lots of places:
	memory handling was overhauled completely; kmalloc now allocates
	memory from the same space as do m_alloc and p_exec, so there is
	no artificial constraint on the number of processes
===========================================================================
version 0.6

dos.c:
	added Talarm() and Pause() system calls
bios.c, tty.c, pipefs.c:
	added real tty structures that programs can manipulate
proc.c:
	added some sanity checks for things like stack overflow
signal.c:
	revamped signal handling so that Psigreturn() no longer needs an
	argument.
dosmem.c:
	made Pexec'ing processes immune to SIGINT, SIGHUP, and SIGTSTP
intr.s:
	fixed the Psigreturn race condition bug
biosfs.c, pipefs.c, filesys.c, util.c:
	added case-insensitive string comparison routine, and modified the
	file systems to use it
bios.c, console.c:
	changed return values of status calls from 1 to -1, to be TOS
	compatible
dos.c:
	added new calls to get resource usage, and set resource limits
dosfile.c:
	added new call, f_select
signal.c:
	changed so stopped processes always have a return code of 0177
biosfs.c:
	added a fake "third button" on the mouse (you get it by holding down
	a shift key and a mouse button)
	made mouse_read return at least 1 byte
bios.c, proc.c, biosfs.c:
	added code to check for CTRL-ALT-key combinations on every
	process switch; thus, debugging, rebooting, etc. do not require
	waiting for a read from the keyboard. Also, ^C sends a SIGINT
	immediately, and ^Z (SIGTSTP) and ^\ (SIGQUIT) take effect
	right away, too.
	CTRL-ALT-DEL supported for TOS < 1.4

=========================================================================
version 0.5

First publically released version (made available for FTP as a beta test)