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

From: <tronics93-gdb at yahoo dot com>
To: gdb at sources dot redhat dot com
Date: Tue, 31 May 2005 10:05:22 -0700 (PDT)
Subject: Re: gdb 6.3 misses breakpoint on Linux when inferior does clone()
Reply-to: tronics93-gdb at yahoo dot com

>> The kernel does not provide any interface for GDB to know whether
or
>> not a clone syscall has used CLONE_VM.   
>> 
>> [Satish] Doesn't ptrace(PTRACE_GETREGS,...) provide that
information >>? Or is that arch. specific ?

>No, it does not.

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]);

--tronics93.

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