llgs: fix Ctrl-C inferior interrupt handling to do the right thing.

* Sends a SIGSTOP to the process.
* Fixes busted SIGSTOP handling.  Now builds a list of non-stopped
  that we wait for the PTRACE group-stop for.  When the final must-stop
  tid gets its group stop, we propagate the process state change.
  Only the signal receiving the notification of the pending SIGSTOP
  is marked with the SIGSTOP signal.  All the rest, if they weren't
  already stopped, are marked as stopped with signal 0.
* Fixes a few broken tests.
* Marks the Linux test I added earlier as expect-pass (no longer XFAIL).

Implements fix for http://llvm.org/bugs/show_bug.cgi?id=20908.

llvm-svn: 217647

1 files changed, 19 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
index 8e010a5..4158e3d 100644
--- a/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
+++ b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
@@ -259,6 +259,25 @@ NativeThreadLinux::SetStoppedBySignal (uint32_t signo)
     m_stop_info.details.signal.signo = signo;
 }
 
+bool
+NativeThreadLinux::IsStopped (int *signo)
+{
+    if (!StateIsStoppedState (m_state, false))
+        return false;
+
+    // If we are stopped by a signal, return the signo.
+    if (signo &&
+        m_state == StateType::eStateStopped &&
+        m_stop_info.reason == StopReason::eStopReasonSignal)
+    {
+        *signo = m_stop_info.details.signal.signo;
+    }
+
+    // Regardless, we are stopped.
+    return true;
+}
+
+
 void
 NativeThreadLinux::SetStoppedByExec ()
 {