Here is the output of attaching to a process with ProcessGDBRemote:
(lldb) log enable lldb state
(lldb) attach 12406
Process::SetPublicState (state = attaching, restarted = 0)
Process::SetPrivateState (stopped)
Process::SetPrivateState (stopped) stop_id = 1
Process::SetPublicState (state = stopped, restarted = 0)
Process 12406 stopped
* thread #1: tid = 0x6f2673, 0x00007fff99688682 libsystem_kernel.dylib read +
10, stop reason = signal SIGSTOP, queue = com.apple.main-thread
frame #0: 0x00007fff99688682 libsystem_kernel.dylib read + 10
libsystem_kernel.dylib`read:
-> 0x7fff99688682 <+10>: jae 0x7fff9968868c ; <+20>
0x7fff99688684 <+12>: movq %rax, %rdi
0x7fff99688687 <+15>: jmp 0x7fff99682c78 ; cerror
0x7fff9968868c <+20>: retq
So we see the public state was set to eStateAttaching and then it was set to
eStateStopped. Try this out and let me know what you are seeing.
Greg
> On Sep 16, 2015, at 1:41 PM, Philippe Lavoie via lldb-dev
> <lldb-dev@lists.llvm.org> wrote:
>
> It is the AttachToProcessWithID that hangs and never returns, so I cannot use
> my listener yet.
>
> -Philippe
> ________________________________________
> From: jing...@apple.com [jing...@apple.com]
> Sent: Wednesday, September 16, 2015 3:34 PM
> To: Philippe Lavoie
> Cc: lldb-dev@lists.llvm.org
> Subject: Re: [lldb-dev] SBTarget::AttachToProcessWithID hangs
>
> Did you try waiting for an event on the listener you've passed to
> AttachToProcess? The last event after everything is done should be the
> notification to the public listener (i.e. your test_listener) that the
> process you attached to has stopped, and nobody is fetching that.
>
> Jim
>
>> On Sep 16, 2015, at 11:59 AM, Philippe Lavoie via lldb-dev
>> <lldb-dev@lists.llvm.org> wrote:
>>
>>
>> I am trying to attach to a stopped process on our dsp target using the
>> SBTarget interface but the call hangs.
>> What I understand is that it is waiting for events on the "lldb.process"
>> broadcaster using the "lldb.Target.Attach.attach.hijack" listener.
>>
>> Enabling the logs, I see that the process is attached successfully and that
>> the stop event is generated. It just seems that the event is not seen by the
>> listener.
>>
>> 1442428969.321000000 004B9590 Listener::WaitForEventsInternal (timeout = {
>> 00000000 }) for lldb.Target.Attach.attach.hijack
>> 1442428969.321000000 004BC7F4 Broadcaster("opus.remote")::BroadcastEvent
>> (event_sp = {00A72050 Event: broadcaster = 004BC7F4 (opus.remote), type =
>> 0x00010000, data = <NULL>}, unique =0) hijack = 00000000
>> 1442428969.341000000 0049AC50 Broadcaster("lldb.target")::BroadcastEvent
>> (event_sp = {00A70C78 Event: broadcaster = 0049AC50 (lldb.target), type =
>> 0x00000002 (modules-loaded), data = {}}, unique =0) hijack = 00000000
>> 1442428969.341000000 004BC7F4 Broadcaster("opus.remote")::BroadcastEvent
>> (event_sp = {00A723C8 Event: broadcaster = 004BC7F4 (opus.remote), type =
>> 0x00010000, data = <NULL>}, unique =0) hijack = 00000000
>> 1442428969.450000000 004BC394
>> Broadcaster("lldb.process.internal_state_broadcaster")::BroadcastEvent
>> (event_sp = {00A723C8 Event: broadcaster = 004BC394
>> (lldb.process.internal_state_broadcaster), type = 0x00000001, data = {
>> process = 004BC308 (pid = 1), state = stopped}}, unique =0) hijack = 00000000
>> 1442428969.452000000 004BC42C
>> Listener('lldb.process.internal_state_listener')::AddEvent (event_sp =
>> {00A723C8})
>> 1442428969.453000000 031CF700 Listener::WaitForEventsInternal (timeout = {
>> 00000000 }) for ProcessOpusRemote::AsyncThread
>> 1442428969.453000000 004BC42C 'lldb.process.internal_state_listener'
>> Listener::FindNextEventInternal(broadcaster=00000000,
>> broadcaster_names=00000000[0], event_type_mask=0x00000000, remove=1) event
>> 00A723C8
>> 1442428969.459000000 0309F8D4 Listener::StartListeningForEvents (broadcaster
>> = 004BC5F4, mask = 0x00000020) acquired_mask = 0x00000020 for
>> Communication::SyncronizeWithReadThread
>> 1442428969.470000000 Process::ShouldBroadcastEvent (00A723C8) => new state:
>> stopped, last broadcast state: stopped - YES
>> 1442428969.471000000 004BC318 Broadcaster("lldb.process")::BroadcastEvent
>> (event_sp = {00A723C8 Event: broadcaster = 004BC318 (lldb.process), type =
>> 0x00000001(state-changed), data = { process = 004BC308 (pid = 1), state =
>> stopped}}, unique =0) hijack = 00000000
>> 1442428969.473000000 00402598 Listener('lldb.Debugger')::AddEvent (event_sp
>> = {00A723C8})
>> 1442428969.474000000 004BC42C Listener::WaitForEventsInternal (timeout = {
>> 00000000 }) for lldb.process.internal_state_listener
>>
>> Here's the code I use to attach.
>>
>> SBDebugger::Initialize();
>>
>> SBDebugger debugger = lldb::SBDebugger::Create(false);
>> debugger.SetAsync(true);
>>
>> const char* categories [] = { "process", "events", 0 };
>> if (!debugger.EnableLog("lldb", categories))
>> return -1;
>>
>> pid_t pid = 1;
>>
>> SBTarget target = debugger.CreateTargetWithFileAndArch(elffile_name,
>> "opus2");
>>
>> SBError error;
>> SBListener listener("test_listener");
>>
>> SBProcess process = target.AttachToProcessWithID(listener, pid, error);
>>
>> if (!process.IsValid())
>> {
>> ...
>>
>>
>> I would be grateful for any insight on the cause of this behavior.
>>
>> Thanks,
>> -Philippe
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev@lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
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