Re: Debugging , Tracing...

From: Slack Ware (
Date: Mon Jul 07 2003 - 18:30:24 EST

From: "Auge Mike"
Subject: Debugging , Tracing...
On Sun, 06 Jul 2003 23:48:17 +0400, Auge Mike wrote:

>Hi all,

> I have asked before few weeks about tracing the
>execution of the
>kernel or debugging it. Unfortunately, I faced some
>problems in using Kgdb,
>especially that the patch was not successful on my
>redhat 7.3.
Hi, Auge. I think that the kernel execution cannot be
debugged nor traced by gdb (kgdb is just a frontend
for the GNU DeBugger), it can be used to trace/debug
the execution of any other program, including modules.
> Whatever, lets say that kgdb worked
>successfully, how can I trace the
>execution of “a specific system call” (lets say
>printf), so I can see how it
>works internally. Is there any other utility for
>that? How can I do that
>with kgdb?
Other thing, printf() is not a system call, you use
write() (syscall #4) for printing things in screen.
A recommendation: don't use gdb or kgdb for tracing
programs execution, use "strace [program] [arguments]"
in your console, instead. GDB is useful for debugging
things, like when a program received a SIGSEGV (it
generates a coredump) in a file "core", and you can
debug it for searching the error that caused that
Strace is a tool that you use for tracing programs
syscalls during it execution.
I hope this will be useful for you.

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