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Full Discussion: Search the symbol table of a child process
Top Forums Programming Search the symbol table of a child process Post 303034403 by alphakili on Wednesday 24th of April 2019 05:56:20 PM
Old 04-24-2019
Well, essentially I wanted to expand my debugger for AmigaOS to work on other platforms. I could do just a libgdb wrapper, but I thought it would be more interesting to do it manually and figure out, how these things work on other OS'es. Which means mainly linux at the time.

Obviously I got stuck just trying to find the address of a simple symbol. I came across this: GitHub - TartanLlama/minidbg: A mini x86 linux debugger for teaching purposes But he has the same problem: There is no symbol relocation done, so he doesn't know the actual placement of the symbols in the executable.

I am going to look into if shared memory of the /proc handler can help me. If not, I am probably going to do some libgdb wrapper for my app and focus on getting that to work and other platforms.
 

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LEARN ABOUT DEBIAN

btraceback

BTRACEBACK(1)					     Network backup, recovery and verification					     BTRACEBACK(1)

NAME

	btraceback - wrapper script around gdb and bsmtp

SYNOPSIS

       btraceback /path/to/binary pid

DESCRIPTION

       btraceback is a wrapper shell script around the gdb debugger (or dbx on Solaris systems) and bsmtp, provided for debugging purposes.

USAGE

       btraceback  is called by the exception handlers of the Bacula daemons during a crash.  It can also be called interactively to view the cur-
       rent state of the threads belonging to a process, but this is not recommended unless you are trying to debug a problem (see below).

NOTES

       In order to work properly, debugging symbols must be available to the debugger on the system, and gdb, or dbx (on Solaris systems) must	be
       available in the $PATH.

       If  the	Director  or Storage daemon runs under a non-root uid, you will probably need to be modify the btraceback script to elevate privi-
       leges for the call to gdb/dbx, to ensure it has the proper permissions to debug when called by the daemon.

       Although Bacula's use of btraceback within its exception handlers is always safe, manual or interactive use of btraceback is subject to the
       same  risks  than  live debugging of any program, which means it could cause Bacula to crash under rare and abnormal circumstances.  Conse-
       quently we do not recommend manual use of btraceback in production environments unless it is required for debugging a problem.

ENVIRONMENT

       btracback relies on $PATH to find the debugger.

FILES

       /usr/lib/bacula/btraceback
	      The script itself.

       /usr/sbin/btraceback
	      symbolic link to /usr/lib/bacula/btraceback

       /etc/bacula/scripts/btraceback.gdb
	      the GDB command batch used to output a stack trace

AUTHOR

       This manual page was written by Lucas B. Cohen <lbc@members.fsf.org>

SEE ALSO

       bsmtp(1)

Kern Sibbald							  6 December 2009						     BTRACEBACK(1)
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