The Atari Compendium/The Atari Compendium (Toad Computers) (1994).iso/files/prgtools/mint/mint96sb.zoo/src/changes

Text File | 1992-10-21 | 75.4 KB | 2,176 lines

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

version 0.96

PATCHLEVEL 14::

tosfs.c:
    Aaargh! Just after cutting this patch I discovered
    that I had the test backwards.

PATCHLEVEL 13::

tosfs.c:
    Changed so that Fsfirst()/Fsnext() always return
    upper case, regardless of domain. (MiNT aware
    programs should use the new directory functions.)
dosdir.c: ++akiernan
    Got rid of the special hack for drive x:, since
    drive x: no longer exists.
asm.y: ++akiernan
    Cleaned up a bit.
*.c: ++julian
    Some minor patches for PureC.
dosdir.c: ++julian
    New system call, Dgetcwd(), with a 'size' parameter;
    this doesn't do anything different from Dgetpath
    now, but it's there for future expansion.

PATCHLEVEL 12::

version.h:
    Update the patchlevel correctly.
pipefs.c,dosfile.c:
    Keep the Unix style semantics for pipes created with
    Fpipe, but not for other fifo's (which by default will
    continue to read the number of bytes requested).

PATCHLEVEL 11::

tty.c:    ++schwab
    Support word-erase and quote-next-char.
fasttext.c: ++schwab
    support fgcol/bgcol
    (screen_ioctl): tty_ioctl is now called by parent by default if
    EINVFN
signal.c (check_sigs): ++schwab
    Use an int to index signals, not a long
biosfs.c (bios_getxattr): ++schwab
    u:\dev\stdin, etc., get the attributes of
    the associated files
dos.c (p_setuid, p_setgid): ++schwab
    Allow setting to the current real [gu]id
bios.c (checkkeys): [e-mail]
    Keys read by do_func_key should not be
    interpreted (esp. UNDO -> SIGQUIT). also recheck shift status
    since do_func_key may take some time
xbios.c: [e-mail]
    Added code to support old (tos < 1.4) Rsconf()
    semantics.
mem.c:
    Changed so that attempts to execute a shared text program
    which has data/bss references in the text segment will
    get an ENOEXEC error instead of ENSMEM.
*.c: [e-mail]
    Applied Julian's purec patches.

PATCHLEVEL 10::

pipefs.c:
    Changed so that read() on a pipe will return as
    soon as some data is available; this is how
    all Unixes work.
*.c:
    Applied Julian's patches to allow compilation with
    PureC.
main.c:
    New variable, MAXMEM=, for setting maximum memory
    size (in K).
main.c:
    Removed PSEUDODRIVES= command, since "alias" has
    replaced it.
util.c:
    Changed atoi to atol; it's more generally useful.
asmtrans:
    Applied Howard's patches; in particular, made %ifdef
    apply to other commands (like %define) as well as to
    code generation.

PATCHLEVEL 9::

asmtrans:
    Cleaned up a bit more for cross-compilation.
intr.spp:
    in_kernel can be set while the process is in user mode
    (if the critical error handler calls GEM)
syscall.spp:
    Get rid of some more magic numbers.
bios.c:
    While fixing the mtt bug, a new bug was introduced. So,
    let's try again :-).

PATCHLEVEL 8::

bios.c:
    Fixed a particularly silly bug in bios.c: in do_bconin(),
    r was being returned without being initialized. Why didn't
    gcc catch this?
*.c:
    Applied Alex's patches for Lattice, and Julian's patches for
    Pure C.
signal.c:
    Kill programs with p_term() instead of terminate() (except for
    signal SIGKILL) so as to allow them a chance to clean up via
    the term_vec vector.
shmfs.c:
    Allow Fattrib() call to change the read-only
    bit. Made Fxattr() return the correct mode
    for shared memory files.
main.c, fasttext.c:
    Allowed HARDSCROLL=AUTO to set the number of
    lines of scrolling to the current screen size.
syscall.spp, inline.h:
    New functions, callout2() and callout1(), with
    less overhead; used by bios.c to call the
    Bconxxx functions.
bios.c:
    Changed calls to Bconxxx functions into
    jumps through the defined vector table in
    low memory, when this is possible (TOS 1.0
    doesn't have the table).
asmtrans, *.spp:
    Added %ifdef, %else, and %endif commands (for
    future expansion). Removed the requirement that
    macros to be expanded be delimited by % signs,
    and cleaned up the definitions. Changed
    "SECTION FOO" to "FOO". Added -purec compilation
    option.
filesys.c:
    Fixed a bug in changedrv (there was no
    check to see if "d" was a BIOS drive before
    aliasdrv[d] was tested).

PATCHLEVEL 7::

biosfs.c,fasttext.c:
    Fixed incorrect code that assumed TCURSON
    was 0.
makefile:
    Fixed Makefile to work with older versions
    of gmake, as well as generic make programs.

PATCHLEVEL 6::

*.s:
    Radical overhaul of how assembly language is
    handled. We now provide 2 utility programs,
    "genmagic" (for producing symbolic names for
    various offsets into structures) and "asmtrans"
    (for processing .spp files, replacing macros
    defined by "genmagic" and optionally translating
    Motorola to MIT syntax). Now we only have to
    maintain the .spp files; the Lattice and gcc
    versions of the .s files are generated automatically,
    and as a side benefit we can get rid of magic
    numbers in the .s files and be sure that if we
    change proc.h, the assembly language will be
    updated properly.
main.c,filesys.c,file.h:
    Added a new command to mint.cnf, "alias", to
    enable aliases for pseudo (and other) drives
    to be created. Also, deleted drives q:, v:, and
    x:. Programs should no longer be using these;
    if they are, users can put things like
    "alias q: u:\pipe" into mint.cnf.
file.h:
    Fixed the definitions for TCURSON and TCURSOFF.
console.c:
    Moved the handle checks in file_* functions into
    separate functions, since for example we *know*
    that handle 0 falls within the legal range; this
    should remove a bit of overhead on BIOS and
    single character GEMDOS I/O.
main.c:
    Got rid of the zeroexit() code; since we now
    allow the whole boot process to be aborted by
    right shift.
pipefs.c:
    Allow Cursconf() to work on TOSWIN pipes.
mem.c:
    Check the date and time of shared text regions
    before re-using them.
bios.c,syscall.s:
    Changed the trap #13 entry point to allow quick
    evaluation of BIOS functions that don't need
    the full context save/restore done.
everywhere:
    Macro-ize TRACE and DEBUG so that it's possible
    to produce a smaller version of MiNT without
    them.
biosfs.c:
    Don't check for keyboard presses after every
    BIOS write, it's too time consuming.

PATCHLEVEL 5::

mem.c:
    Another bug: we shouldn't do the dLibs Pexec
    hack on the first process we start up, because
    it means messing with the MiNT basepage (which
    is not ours to mess with, it's TOS's).
main.c:
    Fixed bug in enter_kernel (rootproc->base is no
    longer necessarily MiNT's basepage).
various places:
    Tried to remove gcc warnings about constant
    expression overflow.
syscall.s:
    Applied Alex's patch to allow trace mode to work
    with non-MiNT debuggers.
various places:
    Applied Alex's patches to get rid of Lattice warnings
    about unneeded assignments.
mem.c:
    Added extra traces to exec_region() in an effort to
    track down the mysterious crash problems that others
    have had.

PATCHLEVEL 4::

dosmem.c:
    Made do_vfork not bother to save shared text regions.
bios.c:
    Made Rwabs respect Dlock.
tosfs.c:
    Made the TOS media change routines lazier (actual
    disk access is deferred until the disk is next
    needed).
main.c:
    Applied Alex's patches for setenv.
everywhere:
    Applied Julian's patches for Pure/Turbo C. The
    resulting kernel doesn't actually work yet, but
    at least we don't get so many error messages when
    compiling. (Who needs lint when you have three
    fussy ANSI compilers?)
mint.h:
    Oops; we should have had #include "inline.h" here.
inline.h:
    Applied jrb's GCC patches, and Alex's Lattice patches.

PATCHLEVEL 3::

bios.c:
    Some optimizations in bflush(). I tried something like
    this before, but messed up the terminal output modes.
    Let's hope I got it right this time. Also:
    removed some dependencies on sizeof(int).
makefile:
    Tried -O2 instead of -O. It seems to work, so let's
    leave it on for now.
inline.h:
    New file to keep short, inlined versions of frequently
    called functions.
intr.s:
    Check the floppy disk locking flag before doing a
    pre-emption. Not really necessary now, but it doesn't
    hurt to be careful.
dosfile.c,*fs.c:
    Applied Alex's F_SETLKW patches. If Alex isn't careful,
    he's going to make MiNT Posix compliant on us :-).
dosmem.c:
    Applied Alex's patches to add a Pwaitpid system call.
main.c:
    If running from the AUTO folder, adjust the basepage
    chains so that MiNT is invisible to programs that
    (incorrectly!) make assumptions about basepages.
proc.c:
    Some optimizations in do_wakeup.
filesys.c:
    Don't call (*fs->dskchng)() twice when a disk
    change is detected.
main.c:
    Make sure the _resvalid system variable has the
    correct magic number in it for indicating that
    we want to catch the reset.

PATCHLEVEL 2::

dosdir.c:
    Really forbid deleting other process' current
    directories (the actual "return EACCDN" was missing!)
proc.c:
    Inlined the check_time() function, and re-arranged
    do_wakeup_things a bit to be more efficient.
syscall.s:
    Streamlined a bit; things are now kept in registers
    where possible.
filesys.c:
    When loading file systems at startup time, don't
    check the \MINT directory if that's the current one.
filesys.c:
    After a media change, instead of throwing away all
    handles that pointed to the changed drive, make
    them point to /dev/null instead, so that they
    won't be re-used until the user explicitly closes
    them.
dosdir.c:
    Allow Dlock() to succeed even if there is an
    unfinished Fsfirst/Fsnext sequence on the drive.
mem.c:
    Allow relocations outside of the program load area;
    apparently, some programs actually need these.
mem.c:
    Insert some sanity checks on memory addresses.
signal.c:
    Restart check_sigs if the process stopped because of
    a signal, since the parent may reset the set of
    pending signals.
cpu.s:
    New file from Alex, to control caching &c.
various places:
    More debugging patches from Alex, to make attaching
    to existing processes work correctly.

PATCHLEVEL 1::

various places:
    Cleaned up the debugging stuff a bit. For example, if a
    process does PTRACESFLAGS on itself, it's the same
    as if the parent did; also, if the process does a
    Pexec with overlay (i.e. Unix exec()) then it stops
    before its first instruction. This makes emulating
    the Unix ptrace() system call much easier.

PATCHLEVEL 0::

biosfs.c:
    Changed Fcntl TIOCISPEED/TIOCOSPEED to return the
    next lowest legal baud rate if an illegal one is
    specified.
filesys.c:
    Fix a bug that would cause an infinite loop if a
    bad .XFS format is encountered.
mem.c,mem.h,dosmem.c:
    Implemented shared text; if the appropriate bit
    (for now, 0x800) in the program header is set, then
    the loader will set up a shared text region for
    the program, and subsequent executions of it will
    run out of the same text segment. Note that this
    does require appropriate compiler support!
filesys.c:
    Fixed bug in the way directory searches are closed
    after a media change.
biosfs.c,intr.s:
    Applied Julian's third mouse button patch for
    /dev/mouse.
*.s:
    Applied Alex's debugging patches. Also: wrote a
    Motorola->MIT syntax converter, so that we only
    have to maintain the stuff in the "asm" directory.
signal.c,proc.h,procfs.c,etc.:
    Applied Alex's debugging patches, with a few
    slight modifications.

version 0.95

PATCHLEVEL14::


filesys.c:
    Check for the existence of the \MINT directory before
    trying to load .XFS files from there.

--- patchlevel 13 released to the public ---

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 ([e-mail])
    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)