[lldb-dev] GDB RSP qVAttachOrWaitSupported

[Todd Fiala]

Thanks, Jim!


On Fri, May 9, 2014 at 9:26 AM, <jingham at apple.com> wrote:

> My bad, there are actually a bunch of vAttach variant packets we added to
> support attaching by process name, and "wait for a process to show up and
> then attach to it" and the like.
>
> I added documentation for them.
>
> Jim
>
> On May 9, 2014, at 8:57 AM, Todd Fiala <todd.fiala at gmail.com> wrote:
>
> > 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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-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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