Any one tried puting breakpoint while debugging a core file? I have been using a gdb for running it.. But unsuccessful to put a breakpoint before executing it. Any sugestion or tool for doing it would be welcomed..
What are the steps you need to take when you put an old HD in a new computer? I just did this. Every time it makes it to the windows boot screen then restarts. I have a bunch of old engineering software that is not compatible with the newer versions of windows. I figured this out after I bought... (6 Replies)
I already manage to get the output that i want.. but wat if removing all the pipes and convert it 1 liner with less pipes. My command below can get the ouput that i want. i just want to remove the pipes or less pipes.
#cat file1
us-west-2a running i-3397a421... (2 Replies)
Hello ,
I am searching a directory for a file and have to assign the filename to a variable .
The variable must have form $$filename
So my code is
echo "'$$filename='`ls -lrt *PreMatch*.csv| head -1 | nawk '{print $9}'`"
however $$ is converting to a number .
How could I make it $$... (3 Replies)
Hi,
I generated many figures in .png format (approximately 120). Right now I need to pair the figures on a single page so that the files with the same file name (i.e. jack) that end with .matrix.png are placed on the left and .cdt.png is on the right (so jack.matrix.png with jack.cdt.png... (6 Replies)
When we put a breakpoint using gcc then what all things happen internally and how the gdb using break is able to pause the execution of process( instead of killing it ) and later on resume the process execution? (0 Replies)
I have Suse linux-2.6.31.5-0.1.
When I try to set breakpoint in application or kernel modules it gives me command not found error.
For instance
when I typed the command
b xyz.c:47
it gives me an error:
"If 'b' is not a typo you can use command-not-found lookup the package that contains... (4 Replies)
I want a way to put a break point in gdb by runing a shell script.
Actualy I wanted to do certain automisation of a long manual process, which includes starting of a process in background and then taking the process ID of that process and then attach the gdb to that process ID. Then finaly... (4 Replies)
gdb(1) GNU Tools gdb(1)NAME
gdb - The GNU Debugger
SYNOPSIS
gdb [-help] [-nx] [-q] [-batch] [-cd=dir] [-f] [-b bps] [-tty=dev] [-s symfile] [-e prog] [-se prog] [-c core] [-x cmds] [-d dir]
[prog[core|procID]]
DESCRIPTION
The purpose of a debugger such as GDB is to allow you to see what is going on ``inside'' another program while it executes--or what another
program was doing at the moment it crashed.
GDB 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.
You can use GDB to debug programs written in C, C++, and Modula-2. Fortran support will be added when a GNU Fortran compiler is ready.
GDB is invoked with the shell command gdb. Once started, it reads commands from the terminal until you tell it to exit with the GDB com-
mand quit. You can get online help from gdb itself by using the command help.
You can run gdb with no arguments or options; but the most usual way to start GDB is with one argument or two, specifying an executable
program as the argument:
gdb program
You can also start with both an executable program and a core file specified:
gdb program core
You can, instead, specify a process ID as a second argument, if you want to debug a running process:
gdb program 1234
would attach GDB to process 1234 (unless you also have a file named `1234'; GDB does check for a core file first).
Here are some of the most frequently needed GDB commands:
break [file:]function
Set a breakpoint at function (in file).
run [arglist]
Start your program (with arglist, if specified).
bt Backtrace: display the program stack.
print expr
Display the value of an expression.
c Continue running your program (after stopping, e.g. at a breakpoint).
next Execute next program line (after stopping); step over any function calls in the line.
edit [file:]function
look at the program line where it is presently stopped.
list [file:]function
type the text of the program in the vicinity of where it is presently stopped.
step Execute next program line (after stopping); step into any function calls in the line.
help [name]
Show information about GDB command name, or general information about using GDB.
quit Exit from GDB.
For full details on GDB, see Using GDB: A Guide to the GNU Source-Level Debugger, by Richard M. Stallman and Roland H. Pesch. The same
text is available online as the gdb entry in the info program.
OPTIONS
Any arguments other than options specify an executable file and core file (or process ID); that is, the first argument encountered with no
associated option flag is equivalent to a `-se' option, and the second, if any, is equivalent to a `-c' option if it's the name of a file.
Many options have both long and short forms; both are shown here. The long forms are also recognized if you truncate them, so long as
enough of the option is present to be unambiguous. (If you prefer, you can flag option arguments with `+' rather than `-', though we
illustrate the more usual convention.)
All the options and command line arguments you give are processed in sequential order. The order makes a difference when the `-x' option
is used.
-help
-h List all options, with brief explanations.
-symbols=file
-s file
Read symbol table from file file.
-write Enable writing into executable and core files.
-exec=file
-e file
Use file file as the executable file to execute when appropriate, and for examining pure data in conjunction with a core dump.
-se=file
Read symbol table from file file and use it as the executable file.
-core=file
-c file
Use file file as a core dump to examine.
-command=file
-x file
Execute GDB commands from file file.
-directory=directory
-d directory
Add directory to the path to search for source files.
-nx
-n Do not execute commands from any `.gdbinit' initialization files. Normally, the commands in these files are executed after all the
command options and arguments have been processed.
-quiet
-q ``Quiet''. Do not print the introductory and copyright messages. These messages are also suppressed in batch mode.
-batch Run in batch mode. Exit with status 0 after processing all the command files specified with `-x' (and `.gdbinit', if not inhib-
ited). Exit with nonzero status if an error occurs in executing the GDB commands in the command files.
Batch mode may be useful for running GDB as a filter, for example to download and run a program on another computer; in order to
make this more useful, the message
Program exited normally.
(which is ordinarily issued whenever a program running under GDB control terminates) is not issued when running in batch mode.
-cd=directory
Run GDB using directory as its working directory, instead of the current directory.
-fullname
-f Emacs sets this option when it runs GDB as a subprocess. It tells GDB to output the full file name and line number in a standard,
recognizable fashion each time a stack frame is displayed (which includes each time the program stops). This recognizable format
looks like two ` 32' characters, followed by the file name, line number and character position separated by colons, and a newline.
The Emacs-to-GDB interface program uses the two ` 32' characters as a signal to display the source code for the frame.
-b bps Set the line speed (baud rate or bits per second) of any serial interface used by GDB for remote debugging.
-tty=device
Run using device for your program's standard input and output.
SEE ALSO
`gdb' entry in info; Using GDB: A Guide to the GNU Source-Level Debugger, Richard M. Stallman and Roland H. Pesch, July 1991.
COPYING
Copyright (c) 1991, 2010 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this manual 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 into another language, under the above conditions 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.
GNU Tools 22may2002 gdb(1)