[lldb] [Process/FreeBSDRemote] Handle exec() from inferior

[krytarowski]

I wonder why NetBSD fails having the same event handling.

lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp

if (info.pl_flags & (PL_FLAG_BORN | PL_FLAG_EXITED)) {
 
     Status error =
         PtraceWrapper(PT_CONTINUE, pid, reinterpret_cast<void *>(1), 0);
     if (error.Fail())
       SetState(StateType::eStateInvalid);
     return;
   }
 
+  if (info.pl_flags & PL_FLAG_EXEC) {
+    Status error = ReinitializeThreads();
+    if (error.Fail()) {
+      SetState(StateType::eStateInvalid);
+      return;
+    }
+
+    // Let our delegate know we have just exec'd.
+    NotifyDidExec();
+
+    for (const auto &thread : m_threads)
+      static_cast<NativeThreadFreeBSD &>(*thread).SetStoppedByExec();
+    SetState(StateType::eStateStopped, true);
+    return;
+  }
+
   if (info.pl_lwpid > 0) {
     for (const auto &t : m_threads) {
       if (t->GetID() == static_cast<lldb::tid_t>(info.pl_lwpid))
         thread = static_cast<NativeThreadFreeBSD *>(t.get());
       static_cast<NativeThreadFreeBSD *>(t.get())->SetStoppedWithNoReason();
     }
     if (!thread)
       LLDB_LOG(log, "thread not found in m_threads, pid = {0}, LWP = {1}", pid,

lldb/test/API/functionalities/exec/TestExec.py

class ExecTestCase(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
     mydir = TestBase.compute_mydir(__file__)
 
     @expectedFailureAll(archs=['i386'], bugnumber="rdar://28656532")
     @expectedFailureAll(oslist=["ios", "tvos", "watchos", "bridgeos"], bugnumber="rdar://problem/34559552") # this exec test has problems on ios systems
     @expectedFailureNetBSD
     @skipIfAsan # rdar://problem/43756823
-    @skipIfFreeBSD  # hangs
     @skipIfWindows
     def test_hitting_exec (self):
         self.do_test(False)
 
     @expectedFailureAll(archs=['i386'], bugnumber="rdar://28656532")
     @expectedFailureAll(oslist=["ios", "tvos", "watchos", "bridgeos"], bugnumber="rdar://problem/34559552") # this exec test has problems on ios systems
     @expectedFailureNetBSD
     @skipIfAsan # rdar://problem/43756823
-    @skipIfFreeBSD  # hangs
     @skipIfWindows
     def test_skipping_exec (self):
         self.do_test(True)
 
     def do_test(self, skip_exec):
         self.build()
         exe = self.getBuildArtifact("a.out")
         secondprog = self.getBuildArtifact("secondprog")