[lldb-dev] GDB RSP qVAttachOrWaitSupported

[Todd Fiala]

Hey Matthew,

Essentially you'll want to return a string like this:
$OK#9a

if your gdb remote debug monitor can handle that (undocumented) element, or
return this:
$#00

if you do not support the packet.

I've been digging into the protocol lately since I'm adding tests for gdb
remote protocol-layer activity, so that I can verify lldb-gdbserver (llgs)
on Linux is acting identically to debugserver on MacOSX (and to make it
easier for us to transition from debugserver to llgs).

I had noted that packet wasn't documented a while back.  When I get to
testing that one, I'll update the doc text file on it.


On Fri, May 9, 2014 at 6:40 AM, Abid, Hafiz <Hafiz_Abid at mentor.com> wrote:

> I have not read the documentation for this packet. But looking at the code,
> It seems that you will return OK if your stub supports this packet.
> Otherwise an empty reply can
> Indicate that packet is not supported.
>
> Please look at the following link for more details about query packets.
>
> https://sourceware.org/gdb/onlinedocs/gdb/General-Query-Packets.html#General-Query-Packets
>
> Thanks,
> Abid
>
> > -----Original Message-----
> > From: Matthew Gardiner [mailto:mg11 at csr.com]
> > Sent: 09 May 2014 13:24
> > To: Abid, Hafiz; lldb-dev at cs.uiuc.edu
> > Subject: Re: [lldb-dev] GDB RSP qVAttachOrWaitSupported
> >
> > Abid, Hafiz wrote:
> > > RNBRemote::HandlePacket_qVAttachOrWaitSupported has the following
> > comments which may give you some idea.
> > >      // We support attachOrWait meaning attach if the process exists,
> > otherwise wait to attach.
> > Ok, thanks.
> >
> > So this whole entity "VAttachOrWaitSupported" is a concept which the stub
> > does or not support, correct?
> >
> > If so, does the stub write back "1", if it does support it, otherwise
> "0"?
> >
> > Presumably if the stub does support this feature, are there any other
> > messages which the stub should then support?
> >
> > I'm still not really clear what's happening here....
> >
> > Matt
> >
> >
> >
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-- 
-Todd
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