[lldb-dev] LLDB Process Attach Failed When Waiting

[Greg Clayton via lldb-dev]

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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