[lldb-dev] run after process stop using python API

[Langmuir, Ben]

Hi Greg,

In my application code I am using the async mode and I have been following process_events.py, so hopefully I'm doing it correctly.  This was just a simple test program to show the issue I was having.

Thanks for the suggestions,

Ben

> -----Original Message-----
> From: Greg Clayton [mailto:gclayton at apple.com]
> Sent: Wednesday, June 26, 2013 5:49 PM
> To: Langmuir, Ben
> Cc: Malea, Daniel; lldb-dev at cs.uiuc.edu
> Subject: Re: [lldb-dev] run after process stop using python API
> 
> I would really suggest using the async API. To see how to use the actual API
> to control your target, checkout the following example:
> 
> svn cat http://llvm.org/svn/llvm-
> project/lldb/trunk/examples/python/process_events.py
> 
> The example shows how to create a target and then debug it and us the API
> to wait for process state changed events and allows you to then control the
> process.
> 
> The main problem with your example below is that:
> 
> i.HandleCommand('r', res)
> 
> "r" can take an arbitrary amount of time. It will return, but your process might
> be running. It might be stopped. You have no idea what your process is
> doing.
> 
> Using the API correctly to wait for events will give you much more accurate
> control over your process, and this is why we made process_events.py.
> 
> Greg Clayton
> 
> On Jun 26, 2013, at 2:10 PM, "Langmuir, Ben" <ben.langmuir at intel.com>
> wrote:
> 
> > How do I turn off the prompt setting?
> >
> > Also, continue isn't what I want - I really do want to re-run the program
> from the start.
> >
> > Ben
> >
> > From: Malea, Daniel
> > Sent: Wednesday, June 26, 2013 5:08 PM
> > To: Langmuir, Ben; lldb-dev at cs.uiuc.edu
> > Subject: Re: [lldb-dev] run after process stop using python API
> >
> > 'run' is a GDB alias for process launch. If a process is already running, the
> command interpreter may be waiting for confirmation from the user that it's
> OK to restart the process (unless you turned off the prompt setting
> beforehand)... You probably want to issue a "continue" command to restart
> the process.
> >
> >
> > Cheers,
> > Dan
> >
> > From:<Langmuir>, Ben Langmuir <ben.langmuir at intel.com>
> > Date: Wednesday, 26 June, 2013 4:57 PM
> > To: "lldb-dev at cs.uiuc.edu" <lldb-dev at cs.uiuc.edu>
> > Subject: [lldb-dev] run after process stop using python API
> >
> > I'm trying to use the 'run' command from the python API when my process
> has stopped at a breakpoint, but it appears to hang.  Script attached.
> >
> > i.HandleCommand('b main', res)
> > i.HandleCommand('r', res) -> runs to breakpoint correctly
> > i.HandleCommand('r', res) -> appears to hang
> >
> > This seems like a bug, but I thought I would ask in case the interpreter was
> waiting for some kind of input I wasn't providing...  I'm running on Linux, and
> haven't had a chance to try OS X yet.
> >
> > Ben
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