[lldb-dev] Better error message for attaching to a process already being debugged

[Jeffrey Tan via lldb-dev]

Hi Greg, I am using the lldb(/usr/bin/lldb) installed by Xcode not
self-built one. For example, I can use lldb to attach to chrome without any
problem. And I can see the debugserver it uses is from
"/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Versions/A/Resources/debugserver".
Do I still need to sign it?
Only the app launched from Xcode IDE can't be attached from this lldb.

On Wed, Mar 9, 2016 at 3:08 PM, Greg Clayton <gclayton at apple.com> wrote:

> Did you follow the instructions and you have made your "lldb_codesign"
> code signing certificate?:
>
> svn cat http://llvm.org/svn/llvm-project/lldb/trunk/docs/code-signing.txt
>
> If you don't do this, your debugserver won't have the ability to debug
> anything. If you don't want to do this, you can remove the "debugserver"
> binary from your LLDB.framework that you built and are running with, and
> then we will fall back to using the one that is installed inside
> /Applications/Xcode.app as that one is Apple code signed.
>
> Greg
>
> > On Mar 9, 2016, at 3:04 PM, Jeffrey Tan via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
> >
> > Hi,
> >
> > My colleague is trying to use our lldb IDE attaching to app run/build
> from Xcode which failed. I can reproduce this with lldb console:
> >
> > jeffreytan-mbp:$ ps aux | grep iOSApp
> > jeffreytan      61816   0.0  0.0  2432772    676 s002  S+    3:00PM
>  0:00.00 grep iOSApp
> > jeffreytan      61806   0.0  0.2  2721120  38600   ??  SXs   3:00PM
>  0:00.24
> /Users/jeffreytan/Library/Developer/CoreSimulator/Devices/EF17E202-3981-4DB0-87C9-2A9345C1E713/data/Containers/Bundle/Application/CAEBA7D7-D284-4489-8A53-A88E56F9BB04/iOSAppTest.app/iOSAppTest
> > jeffreytan-mbp:$ lldb -p 61806
> > (lldb) process attach --pid 61806
> > error: attach failed: attach failed: unable to attach
> >
> > My theory is:
> > 1. Xcode does not have the concept of run without debugger and run under
> debugger, so it always run app with debugger enabled.(Is this true?)
> > 2. And you can't have two native debuggers debugging the same process on
> Mac(this is true on Windows, is it true for Mac or Linux?)
> >
> > If both are true, can we report meaningful message like "inferior is
> already being debugged" or something similar instead of the generic error
> message like "attach failed: unable to attach"?
> >
> > Btw: I found I can still use gdb to attach to the process(with a
> permission elevation dialog pop-up) and see the callstack. How does gdb do
> that?
> >
> > Jeffrey
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
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