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NAME
ddd, xddd - The Data Display Debugger
SYNOPSIS
ddd [--help] [--gdb] [--dbx] [--ladebug] [--xdb] [--jdb]
[--pydb] [--perl] [--debugger name] [--[r]host
username@]hostname]] [--trace] [--version] [--confi-
guration] [options...] [prog[core|procID]]
but usually just
ddd program
DESCRIPTION
DDD is a graphical front-end for GDB and other command-line
debuggers. Using DDD, you can see what is going on "inside"
another program while it executes-or what another program
was doing at the moment it crashed.
DDD can do four main kinds of things (plus other things in
support of these) to help you catch bugs in the act:
o Start your program, specifying anything that might affect
its behavior.
o Make your program stop on specified conditions.
o Examine what has happened, when your program has stopped.
o Change things in your program, so you can experiment with
correcting the effects of one bug and go on to learn about
another.
"Classical" UNIX debuggers such as the GNU debugger (GDB)
provide a command-line interface and a multitude of commands
for these and other debugging purposes. DDD is a comfort-
able graphical user interface around an inferior GDB, DBX,
Ladebug, XDB, JDB, Python debugger, or Perl debugger.
DDD is invoked with the shell command ddd. You can open a
program to be debugged using `File->Open Program' (the `Open
Program' item in the `File' menu. You can get online help
at any time using the `Help' menu; for the first steps, try
`Help->What Now?'. Quit DDD using `File->Exit'.
More information on DDD is contained in the DDD Manual. You
can read the text-only version in DDD (via `Help->DDD Refer-
ence') or in Emacs (as Info file). Full-fledged HTML,
PostScript, and PDF versions are available online via the
DDD WWW page,
http://www.gnu.org/software/ddd/
OPTIONS
These are the most important options used when starting DDD.
All options may be abbreviated, as long as they are unambi-
guous; single dashes may also be used. DDD also understands
the usual X options such as `-display' or `-geometry'; see
X(1) for details.
All arguments and options not handled by DDD are passed to
the inferior debugger. To pass an option to the inferior
debugger that conflicts with an X option, or with a DDD
option listed here, use the `--debugger' option, below.
--configuration
Show the DDD configuration settings and exit.
--dbx
Run the DBX debugger as inferior debugger.
--debugger name
Invoke the inferior debugger name. This is useful if
you have several debugger versions around, or if the
inferior debugger cannot be invoked as `gdb', `dbx',
`xdb', `jdb', `pydb', or `perl' respectively.
This option can also be used to pass options to the
inferior debugger that would otherwise conflict with
DDD options. For instance, to pass the option `-d
directory' to XDB, use:
ddd --debugger "xdb -d directory"
If you use the `--debugger' option, be sure that the
type of inferior debugger is specified as well. That
is, use one of the options `--gdb', `--dbx', `--xdb',
`--jdb', `--pydb', or `--perl' (unless the default set-
ting works fine).
--gdb
Run the GDB debugger as inferior debugger.
--help
Give a list of frequently used options. Show options
of the inferior debugger as well.
--host [username@]hostname
Invoke the inferior debugger directly on the remote
host hostname. If username is given and the `--login'
option is not used, use username as remote user name.
--jdb
Run JDB as inferior debugger.
--ladebug
Run Ladebug as inferior debugger.
--perl
Run Perl as inferior debugger.
--pydb
Run PYDB as inferior debugger.
--rhost [username@]hostname
Run the inferior debugger interactively on the remote
host hostname. If username is given and the `--login'
option is not used, use username as remote user name.
--trace
Show the interaction between DDD and the inferior
debugger on standard error. This is useful for debug-
ging DDD. If `--trace' is not specified, this informa-
tion is written into `$HOME/.ddd/log', such that you
can also do a post-mortem debugging.
--version
Show the DDD version and exit.
--xdb
Run XDB as inferior debugger.
A full list of options, including important options of the
inferior debugger, can be found in the DDD manual.
SEE ALSO
X(1), gdb(1), dbx(1), xdb(1), perldebug(1)
`ddd' entry in info.
`gdb' entry in info.
Debugging with DDD: User's Guide and Reference Manual, by
Andreas Zeller.
Using GDB: A Guide to the GNU Source-Level Debugger, by
Richard M. Stallman and Roland H. Pesch.
Java Language Debugging, at http://java.sun.com/ (and its
mirrors) in /products/jdk/1.1/debugging/
The Python Language, at http://www.python.org/ and its mir-
rors.
DDD-A Free Graphical Front-End for UNIX Debuggers, by
Andreas Zeller and Dorothea Luetkehaus, Computer Science
Report 95-07, Technische Universitaet Braunschweig, 1995.
DDD ein Debugger mit graphischer Datendarstellung, by
Dorothea Luetkehaus, Diploma Thesis, Technische Universitaet
Braunschweig, 1994.
The DDD FTP site,
ftp://ftp.gnu.org/
The DDD WWW page,
http://www.gnu.org/software/ddd/
The DDD Mailing List,
[email protected]
For more information on this list, send a mail to
[email protected] .
COPYRIGHT
This manual page is Copyright O 1999 Universitaet Passau,
Germany.
Permission is granted to make and distribute verbatim copies
of this manual page provided the copyright notice and this
permission notice are preserved on all copies.
Permission is granted to copy and distribute modified ver-
sions of this manual page under the conditions for verbatim
copying, provided that the entire resulting derived work is
distributed under the terms of a permission notice identical
to this one.
Permission is granted to copy and distribute translations of
this manual page into another language, under the above con-
ditions for modified versions, except that this permission
notice may be included in translations approved by the Free
Software Foundation instead of in the original English.
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