Here is a list of changes from DJGPP V2.01 to V2.02
tests/libclink no longer looks for DJGPP V1.
emu387.dxe has been rebuilt to reflect fpatan fixes.
mcount.c no longer writes to the mono monitor. This had caused seg faults when profiling.
You can now “symlink” to files with 8 character base names (like 12345678.exe). Previously, stub.asm assumed al was zero when it wasn’t always that way.
rawclock() now actually returns the number of ticks since
midnight, not since program start.
libc.tex now uses “Master Index” instead of “Index” due
to conflicts with the node for
srand() is now documented.
memchr() is now 8-bit clean.
delay() includes the header file.
__dpmi_simulate_real_mode_procedure_iret() is now properly
documented as DPMI call 0x0302.
edebug now unassembles
qsort() has correct prototypes
in the examples.
info/dir.txi includes an entry for the FAQ.
Functions in conio.h now support DOS/V’s virtual screens.
edebug and other debuggers using the common debugging framework will properly close files when they terminate the debuggee. This allows to restart the debuggee without losing handles.
fnsplit() now handles files like .emacs properly.
glob() now handles files like .emacs properly. This will fix
wildcard expansion on new programs.
go32-v2.exe properly reverts the interrupt table before running the child process.
_lfn_gen_short_name no longer crashes in rare cases.
s[f]_floor functions in libm.a no
longer crash when emulated.
readdir support multibyte file names.
You may now
set 387=y to avoid the auto-detection.
rename("x", "x/y") will now fail when "x" is a directory.
sigpending actually do something now.
All of the POSIX signal functions are now documented.
_truename didn’t use
putpath and therefore didn’t support
/dev/ style of standard devices.
stat also failed on
devices in some cases. We think this is the cause of bash
failing on redirection to /dev/null.
Documentation for FSEXT-enabled functions now mentions that they are FSEXT-enabled, and how to avoid that.
bioscom now documents (and uses) the
ffs() returns the correct value.
Various fixes and optimizations to
Return codes of
unlock() are correct.
tmpfile() always opens the temp file in binary mode.
statfs returns the actual size of a CD-ROM instead of the
default returned by MSCDEX.
gxx won’t try to link extra libraries if you specify
-S on the command line.
_dos_findfirst() takes a
const char * instead of
rename() handles extra error codes some network redirectors return.
ctime handles dumped emacs and DOS-style
pathconf() returns actual values for NAME_MAX and PATH_MAX, rather
than defaults. Therefore, it can be used to detect whether a given disk
supports long file names.
The return values for
_go32_dpmi_lock_code are now documented.
The initial stack is aligned to an 8-byte boundary.
getxkey allow you to do ALT-keypad-224.
popen selects temporary files correctly now.
pclose returns the status of the program it read from.
stubedit won’t let you set a transfer buffer bigger than 63k.
If the stub detects a zero there, it assumes 63k.
The stub now returns error codes in the 100..110 range when it has a startup failure.
system works if
$COMSPEC isn’t set.
struct lconv includes
scanf works with long double formats like
_osminor are now set at startup.
write() now calls FSEXT for “text” files.
assert.h causes no more warnings with some gcc options.
access() now thinks devices are read/write, instead of read-only,
regardless of what the device actually supports.
stackavail() in stdlib.h
echo, split and merge are now called djecho, djsplit and djmerge to avoid clashes with GNU’s echo, split and merge programs.
tzname bug fixed;
tzname no longer a function stub (!)
_v2_prog_type to sys/system.h and extended
symlink with it.
fwrite are documented as returning less than the
requested size, rather than -1 on error, since they never return
stub forcefully closes file descriptors 18 and 19, so that the
stub and the DPMI server have enough handles to open the swap file and
read the COFF information of the DJGPP executable.
Minor fixes to
popen’s list of pending commands.
tempnam returns allocated memory, not a pointer to static space,
and does not ignore its arguments tmpdir and prefix anymore.
difftime can return negative numbers now.
gethostname removes trailing spaces now.
insque works with empty lists now.
sync also calls
printf flushes stdout every time, unless it is redirected to a
file, to reduce programmer confusion. Note that
vprintf don’t do this.
exit calls destructors *before* it closes all open files.
The code that reads blocks of data for FILE* streams has a new “slow start” algorithm that’s designed to adjust the read size for both programs that seek a lot reading small amounts of data, and programs that don’t seek but read lots of data.
mktime handles the DST change hour gracefully
disable don’t use DPMI (sti/cli are less buggy!)
The command line parser can handle response files generated by ‘find -print0’.
free have been replaced by a more efficient
(and not BSD) algorithm. The source archive still contains
bsdmallo.c and a new even faster (but more wasteful) version in
getmntent better supports Windows NT and doesn’t cause DOS to
return stale data when the disk is changed. Removable media such as JAZ
drives are no longer reported when the drive is empty. Disks written by
Windows 9X are no longer reported with bogus names taken from LFN
directory entries (which have their volume label attribute bit set).
File names which begin with /dev/ or x:/dev/ (where x: is any drive letter) are treated specially by all file-oriented library functions. /dev/tty is converted to con and /dev/null is converted to nul, to make porting of Unix programs easier. Other names get the drive letter and the /dev/ prefix removed, so e.g. d:/dev/lpt1 is converted to lpt1. This is because DOS handles device names inconsistently unless they are devoid of the x:/dev/ prefix. File names of the form /dev/x/foo are converted to x:/foo; this allows to use Unix-style path names which always begin with a forward slash.
The startup code now masks all numeric exceptions when a
floating-point hardware is present. This means that illegal operations
sqrt(-1) will now return
NaN (Not-a-number) rather
than raise the
fstat is now more reliable when called from programs under a
debugger, does not report bogus results on NT, reports files on the A:
drive correctly, and correctly reports the write access bit on
stat is now more reliable on NT and with character devices.
djgpp.env is read before command line arguments are expanded,
so that they’ll honor the
LFN setting in djgpp.env.
sys_siglist array is now available with the names of all
the signals, and the function
psignal can be used to print
messages which include the signal names.
The new functions
dirname can be used to
extract directory and basename parts from file names.
_my_ss work for selectors with
the high bit set.
The new function
_creatnew creates a file only if it didn’t
tmpfile makes sure it opens a file which is not and will not be
used by any other program. It does so by repeatedly calling
_creatnew succeeds to create a file which
didn’t exist before. The temporary file is opened in DENY_ALL mode, so
that no other process can neither read from nor write to it. In case of
tmpfile does not leak memory anymore.
Previously, there was a small probability that a call to
O_EXCL bits set would succeed even
though the named file already existed (created by another process).
This window is now closed.
mkstemp now makes sure the file it creates is unique even if
other processes can create files in the same directory, and opens the
file in DENY_ALL mode.
__FSEXT_alloc_fd now duplicates the initial file handle instead
of reopening the NUL device on each call. Thus, it is no longer limited
by the value of the ‘FILES=’ parameter on your CONFIG.SYS,
but can allocate up to 254 handles (which is the maximum number allowed
rename will properly fail if the file doesn’t exist.
system is now compliant with ANSI C Standard when its argument is
a NULL pointer.
Previously, at program startup
errno would retain whatever value
it was assigned by the DJGPP startup code. ANSI C Standard requires
errno to be zero at the beginning of
main, so it is now
reset to zero before calling
The stack dump printed when a program is aborted or crashes was improved. First, it is no longer limited to 10 stack frames. When the standard error stream is connected to the console, the maximum number of frames is computed so that the stack dump will use all the available screen area, without scrolling off the visible part. For example, at 50-line display, you can have as much as 36 stack frames printed and still see the registers and selectors dump, and the exception mnemonic that precede it.
When stderr is not the console, the number of printed stack frames is only limited by the stack size of the running program.
In addition, the top and bottom of both the application code stack and the locked stack used for processing exceptions, are printed. This makes detection of stack overflows and other stack-related atrocities much easier.
_doserrno global variable is now provided. Whenever a DOS
call fails, this variable gets assigned the value of the error code
returned by the failed DOS function.
The header sys/dxe.h now works with C++.
fflush now conforms to ANSI C standard when called with a
__dpmi_yield doesn’t wedge the DOS box on some versions of
Windows 9X anymore.
outports* takes a const buffer
glob will initalize
*pglob when appropriate.
The conversion functions
gcvt are now provided.
The startup code now recognizes an additional flag _CRT0_FLAG_KEEP_QUOTES, which forces it to retain quote characters in command-line arguments.
redir invokes the subsidiary program in a way that preserves the
command-line expansion. Thus, you can now use
redir to invoke
programs whose command lines include quote characters and file name
wildcards, and they will work as expected.
redir no longer crashes if the subsidiary program was
interrupted or crashed, and reports the run time with millisecond
The exit code now makes sure the timer interrupt is left pointing to its
original handler, even if the program is aborted, or exits without
__djgpp_exception_toggle now toggles the timer
interrupt handler as well, if it was hooked by SIGALRM/SIGPROF handler
setitimer. Thus, timers, periodic alarms, and profiling
will be disabled inside blocks that call
The functions of the
printf family now always print a negative
sign for a negative floating-point argument, even when the conversion
generated no significant digits (i.e. only zeros are printed), if the
format specifier requests an explicit sign, like in "%+f". A special
NaN value will also be printed with a sign in these cases (e.g. try
select now correctly zeroes out all the bits in the
arguments when it returns due to expired timeout.
readdir now includes hidden files and directories in the search
by default. The
__OPENDIR_FIND_HIDDEN bit of the
__opendir_flags variable has no effect, and a new
__OPENDIR_NO_HIDDEN bit is provided to exclude hidden
files/directories from the search.
rewinddir don’t lose search
handles anymore when long file names are supported.
seekdir will not miss the (possibly faked) . and
.. entries in root directories.
Asynchronous signals (
SIGPROF) no longer crash programs running on Windows when the
signal happens inside the
__dpmi_int function (
is called by every library function that requires DOS or BIOS services).
We believe this problem caused crashes in multi-threading packages that
used timers and
SIGALRM to switch threads.