Re: gdb 6.3 misses breakpoint on Linux when inferior does clone()

Mark Kettenis
2005-06-11T23:31:53Z

Date: Wed, 1 Jun 2005 09:23:31 -0400
From: Daniel Jacobowitz <drow@false.org>

On Tue, May 31, 2005 at 10:05:22AM -0700, tronics93-gdb@yahoo.com wrote:
> The following code snippet gets the flags passed in to clone() (on
> x86):
>
> unsigned long regs[FRAME_SIZE];
>
> if (ptrace(PTRACE_GETREGS, pid, 0, &regs) < 0)
> perror("ptrace_getregs failed:");
>
> printf("syscall=%d, arg1=%#x, arg2=%#x\n", regs[ORIG_EAX],
> regs[EBX], regs[ECX]);

Only if you're stopped at the clone. Hmm. Good point; perhaps we can
recover them from registers when we receive the clone event.

But having to do that in a machine-dependent manner really sucks...

It could probably be implemented if someone spent the time.

...so that time is probably better spent on implementing the proper
machine-independent functionality in the Linux kernel!

Mark