[PATCH vdagent-win] vdservice stops vdagent via event

[Arnon Gilboa <agilboa@xxxxxxxxxx>]

Terminate agent politely instead of ugly TerminateProcess(), so now
VD_AGENT_CLIPBOARD_RELEASE is sent (if guest owned the clipboard),
followed by cleanup.

rhbz #903379
---
 common/vdcommon.h       |    1 +
 vdagent/vdagent.cpp     |   16 +++++++++++++++-
 vdservice/vdservice.cpp |    5 ++++-
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/common/vdcommon.h b/common/vdcommon.h
index cc3bd3d..605153d 100644
--- a/common/vdcommon.h
+++ b/common/vdcommon.h
@@ -33,6 +33,7 @@ typedef CRITICAL_SECTION mutex_t;
 #define MUTEX_UNLOCK(mutex) LeaveCriticalSection(&mutex)
 
 #define VD_AGENT_REGISTRY_KEY "SOFTWARE\\Red Hat\\Spice\\vdagent\\"
+#define VD_AGENT_STOP_EVENT   TEXT("Global\\vdagent_stop_event")
 
 #if defined __GNUC__
 #define ALIGN_GCC __attribute__ ((packed))
diff --git a/vdagent/vdagent.cpp b/vdagent/vdagent.cpp
index 85244c0..722815c 100644
--- a/vdagent/vdagent.cpp
+++ b/vdagent/vdagent.cpp
@@ -128,6 +128,7 @@ private:
     INPUT _input;
     DWORD _input_time;
     HANDLE _control_event;
+    HANDLE _stop_event;
     VDAgentMessage* _in_msg;
     uint32_t _in_msg_pos;
     bool _pending_input;
@@ -180,6 +181,7 @@ VDAgent::VDAgent()
     , _mouse_y (0)
     , _input_time (0)
     , _control_event (NULL)
+    , _stop_event (NULL)
     , _in_msg (NULL)
     , _in_msg_pos (0)
     , _pending_input (false)
@@ -266,6 +268,12 @@ bool VDAgent::run()
         cleanup();
         return false;
     }
+    _stop_event = OpenEvent(SYNCHRONIZE, FALSE, VD_AGENT_STOP_EVENT);
+    if (!_stop_event) {
+        vd_printf("OpenEvent() failed: %lu", GetLastError());
+        cleanup();
+        return false;
+    }
     memset(&wcls, 0, sizeof(wcls));
     wcls.lpfnWndProc = &VDAgent::wnd_proc;
     wcls.lpszClassName = VD_AGENT_WINCLASS_NAME;
@@ -312,6 +320,7 @@ bool VDAgent::run()
 
 void VDAgent::cleanup()
 {
+    CloseHandle(_stop_event);
     CloseHandle(_control_event);
     CloseHandle(_vio_serial);
     delete _desktop_layout;
@@ -428,15 +437,20 @@ void VDAgent::input_desktop_message_loop()
 
 void VDAgent::event_dispatcher(DWORD timeout, DWORD wake_mask)
 {
+    HANDLE events[] = {_control_event, _stop_event};    
+    const DWORD event_count = sizeof(events) / sizeof(events[0]);
     DWORD wait_ret;
     MSG msg;
 
-    wait_ret = MsgWaitForMultipleObjectsEx(1, &_control_event, timeout, wake_mask, MWMO_ALERTABLE);
+    wait_ret = MsgWaitForMultipleObjectsEx(event_count, events, timeout, wake_mask, MWMO_ALERTABLE);
     switch (wait_ret) {
     case WAIT_OBJECT_0:
         handle_control_event();
         break;
     case WAIT_OBJECT_0 + 1:
+        _running = false;
+        break;
+    case WAIT_OBJECT_0 + event_count:
         while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
             TranslateMessage(&msg);
             DispatchMessage(&msg);
diff --git a/vdservice/vdservice.cpp b/vdservice/vdservice.cpp
index a2cf67d..a899ae1 100644
--- a/vdservice/vdservice.cpp
+++ b/vdservice/vdservice.cpp
@@ -92,6 +92,7 @@ private:
     SERVICE_STATUS_HANDLE _status_handle;
     PROCESS_INFORMATION _agent_proc_info;
     HANDLE _control_event;
+    HANDLE _agent_stop_event;
     HANDLE* _events;
     TCHAR _agent_path[MAX_PATH];
     VDControlQueue _control_queue;
@@ -157,6 +158,7 @@ VDService::VDService()
     ZeroMemory(&_agent_proc_info, sizeof(_agent_proc_info));
     _system_version = supported_system_version();
     _control_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+    _agent_stop_event = CreateEvent(NULL, FALSE, FALSE, VD_AGENT_STOP_EVENT);
     _agent_path[0] = wchar_t('\0');
     MUTEX_INIT(_agent_mutex);
     MUTEX_INIT(_control_mutex);
@@ -165,6 +167,7 @@ VDService::VDService()
 
 VDService::~VDService()
 {
+    CloseHandle(_agent_stop_event);
     CloseHandle(_control_event);
     delete _events;
     delete _log;
@@ -777,7 +780,7 @@ bool VDService::kill_agent()
     _agent_alive = false;
     proc_handle = _agent_proc_info.hProcess;
     _agent_proc_info.hProcess = 0;
-    TerminateProcess(proc_handle, 0);
+    SetEvent(_agent_stop_event);
     if (GetProcessId(proc_handle)) {
         wait_ret = WaitForSingleObject(proc_handle, VD_AGENT_TIMEOUT);
         switch (wait_ret) {
-- 
1.7.7.6

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