/* attach a process to a debugger thread and suspend it */
static int debugger_attach( struct process *process, struct thread *debugger )
{
struct thread *thread;
if (process->debugger) goto error; /* already being debugged */
if (!is_process_init_done( process )) goto error; /* still starting up */
if (list_empty( &process->thread_list )) goto error; /* no thread running in the process */
/* make sure we don't create a debugging loop */
for (thread = debugger; thread; thread = thread->process->debugger)
if (thread->process == process) goto error;
/* don't let a debugger debug its console... won't work */
if (debugger->process->console && debugger->process->console->renderer->process == process)
goto error;
suspend_process( process );
if (!set_process_debugger( process, debugger ))
{
resume_process( process );
return 0;
}
if (!set_process_debug_flag( process, 1 ))
{
process->debugger = NULL;
resume_process( process );
return 0;
}
return 1;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* attach a process to a debugger thread and suspend it */
static int debugger_attach( struct process *process, struct thread *debugger )
{
if (process->debugger) goto error; /* already being debugged */
if (debugger->process == process) goto error;
if (!is_process_init_done( process )) goto error; /* still starting up */
if (list_empty( &process->thread_list )) goto error; /* no thread running in the process */
/* don't let a debugger debug its console... won't work */
if (debugger->process->console)
{
struct thread *renderer = console_get_renderer(debugger->process->console);
if (renderer && renderer->process == process)
goto error;
}
suspend_process( process );
if (!set_process_debugger( process, debugger ))
{
resume_process( process );
return 0;
}
if (!set_process_debug_flag( process, 1 ))
{
process->debugger = NULL;
resume_process( process );
return 0;
}
return 1;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* you must do a resume_after_ptrace when finished with the thread */
static int suspend_for_ptrace( struct thread *thread )
{
/* can't stop a thread while initialisation is in progress */
if (thread->unix_pid == -1 || !is_process_init_done(thread->process)) goto error;
/* this may fail if the client is already being debugged */
if (ptrace( PTRACE_ATTACH, get_ptrace_pid(thread), 0, 0 ) == -1)
{
if (errno == ESRCH) thread->unix_pid = thread->unix_tid = -1; /* thread got killed */
goto error;
}
if (waitpid_thread( thread, SIGSTOP )) return 1;
resume_after_ptrace( thread );
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* detach a process from a debugger thread (and resume it ?) */
int debugger_detach( struct process *process, struct thread *debugger )
{
struct debug_event *event;
struct debug_ctx *debug_ctx;
if (!process->debugger || process->debugger != debugger)
goto error; /* not currently debugged, or debugged by another debugger */
if (!debugger->debug_ctx ) goto error; /* should be a debugger */
/* init should be done, otherwise wouldn't be attached */
assert(is_process_init_done(process));
suspend_process( process );
/* send continue indication for all events */
debug_ctx = debugger->debug_ctx;
/* find the event in the queue
* FIXME: could loop on process' threads and look the debug_event field */
LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
{
if (event->state != EVENT_QUEUED) continue;
if (event->sender->process == process)
{
assert( event->sender->debug_event == event );
event->status = DBG_CONTINUE;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
/* from queued debug event */
resume_process( process );
break;
}
}
/* remove relationships between process and its debugger */
process->debugger = NULL;
if (!set_process_debug_flag( process, 0 )) clear_error(); /* ignore error */
/* from this function */
resume_process( process );
return 0;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
