[lldb-dev] LLDB Process Attach Failed When Waiting

[Ryan Lovelett via lldb-dev]

Well at least there is a little good news. I understood way more of
those logs than I thought I did.
> So two issues here:
> 1 - we need a better error message when vAttachWait returns
> unsupported> 2 - fix lldb-server to support vAttachWait

A few questions.

What is the protocol here? Can/should I report the issues at
https://bugs.llvm.org/ ? Or is that something that a project member
needs to do? Assuming that I can, would this be two seperate issues or
one "large" issue?
Barring that this is not something someone else might implement
better/faster than me. Considering I have zero LLDB development
experience is this something that I could tackle?
On Thu, May 31, 2018, at 3:02 PM, Greg Clayton wrote:
> lldb-server claims it doesn't support it:
> 
> lldb             <  48> send packet:
> $vAttachWait;6c616e677365727665722d7377696674#d6> lldb             <   4> read packet: $#00
> 
> 
> Returning the empty packet ("$#00") means it is not supported, but we
> really should give a better error message than this.> 
> It isn't that hard to implement. It would be easy to copy the code
> that is in debugserver in DNB.cpp in the DNBProcessAttachWait
> function. Most of it is probably posix style stuff.> 
> So two issues here:
> 1 - we need a better error message when vAttachWait returns
> unsupported> 2 - fix lldb-server to support vAttachWait
> 
> Greg
> 
> 
>> On May 31, 2018, at 11:04 AM, Ryan Lovelett <ryan at lovelett.me> wrote:>> 
>>> It might be a lldb-server issue?
>> 
>> How would one go about determining this?
>> 
>> (lldb) log enable -f /tmp/packates.txt gdb-remote packets
>> (lldb) process attach --name "<name>" --waitfor
>> error: attach failed: lost connection
>> 
>> Attached the log output. Maybe it'll make more sense to you than me.>> 
>> That escalated quickly. So I've read through that log. I found
>> something that says $qVAttachOrWaitSupported#38 with the following
>> response being $#00. Perhaps I'm reading too much but is it that it's
>> reporting that it is not supported?>> 
>> Does lldb-server need to be compiled in a certain way to add support
>> for attach wait?>> 
>> On Thu, May 31, 2018, at 1:49 PM, Greg Clayton wrote:
>>> Try enabling logging with:
>>> 
>>> (lldb) log enable -f /tmp/packets.txt gdb-remote packets
>>> 
>>> And the try the attach. It might be a lldb-server issue?
>>> 
>>>> On May 31, 2018, at 9:02 AM, Ryan Lovelett via lldb-dev <lldb-
>>>> dev at lists.llvm.org> wrote:>>>> 
>>>> I am attempting to use: process attach --name "<name>" --waitfor
>>>> 
>>>> The problem is that it immediately returns error: attach failed:
>>>> lost connection.>>>> 
>>>> Is this something I can troubleshoot further? Or is this not
>>>> supported on Linux?>>>> 
>>>> -- 
>>>> Ryan Lovelett
>>>> _______________________________________________
>>>> lldb-dev mailing list
>>>> lldb-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>> <packates.txt>

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