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utils/vmpi/vmpi_service/service_helpers.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "stdafx.h"
+#include "service_helpers.h"
+
+
+static CRITICAL_SECTION g_CtrlHandlerMutex;
+
+static void (*g_pInternalServiceFn)( void *pParam ) = NULL;
+static void *g_pInternalServiceParam = NULL;
+
+static volatile bool g_bShouldExit = false;
+
+
+SERVICE_STATUS          MyServiceStatus; 
+SERVICE_STATUS_HANDLE   MyServiceStatusHandle = NULL;
+
+
+void WINAPI MyServiceCtrlHandler( DWORD Opcode )
+{ 
+    DWORD status; 
+ 
+    switch(Opcode) 
+    { 
+        case SERVICE_CONTROL_STOP: 
+			// Do whatever it takes to stop here. 
+			ServiceHelpers_ExitEarly();
+
+            MyServiceStatus.dwWin32ExitCode = 0; 
+            MyServiceStatus.dwCurrentState  = SERVICE_STOPPED; 
+ 
+            if ( !SetServiceStatus( MyServiceStatusHandle, &MyServiceStatus) )
+            { 
+                status = GetLastError(); 
+                Msg( "[MY_SERVICE] SetServiceStatus error %ld\n", status ); 
+            } 
+ 
+            Msg( "[MY_SERVICE] Leaving MyService \n" ); 
+            return; 
+ 
+        case SERVICE_CONTROL_INTERROGATE: 
+			// Fall through to send current status. 
+            break; 
+ 
+        default: 
+            Msg("[MY_SERVICE] Unrecognized opcode %ld\n", Opcode ); 
+    } 
+ 
+    // Send current status. 
+    if ( !SetServiceStatus( MyServiceStatusHandle, &MyServiceStatus ) )
+    { 
+        status = GetLastError(); 
+        Msg( "[MY_SERVICE] SetServiceStatus error %ld\n", status ); 
+    } 
+}
+
+
+void WINAPI MyServiceStart( DWORD argc, LPTSTR *argv ) 
+{ 
+    DWORD status; 
+
+    MyServiceStatus.dwServiceType        = SERVICE_WIN32; 
+    MyServiceStatus.dwCurrentState       = SERVICE_START_PENDING; 
+    MyServiceStatus.dwControlsAccepted   = SERVICE_ACCEPT_STOP; 
+    MyServiceStatus.dwWin32ExitCode      = 0; 
+    MyServiceStatus.dwServiceSpecificExitCode = 0; 
+    MyServiceStatus.dwCheckPoint         = 0; 
+    MyServiceStatus.dwWaitHint           = 0; 
+ 
+    MyServiceStatusHandle = RegisterServiceCtrlHandler( "MyService", MyServiceCtrlHandler ); 
+    if ( MyServiceStatusHandle == (SERVICE_STATUS_HANDLE)0 ) 
+    { 
+        Msg("[MY_SERVICE] RegisterServiceCtrlHandler failed %d\n", GetLastError() );
+        return; 
+    } 
+
+    // Initialization complete - report running status. 
+    MyServiceStatus.dwCurrentState       = SERVICE_RUNNING; 
+ 
+    if ( !SetServiceStatus( MyServiceStatusHandle, &MyServiceStatus ) )
+    { 
+        status = GetLastError(); 
+        Msg( "[MY_SERVICE] SetServiceStatus error %ld\n", status );
+    } 
+
+
+	// Run the app's main in-thread loop.    
+	g_pInternalServiceFn( g_pInternalServiceParam );
+
+
+	// Tell the SCM that we're stopped.        
+	MyServiceStatus.dwCurrentState       = SERVICE_STOPPED; 
+    MyServiceStatus.dwWin32ExitCode      = NO_ERROR;
+    MyServiceStatus.dwServiceSpecificExitCode = 0; 
+    SetServiceStatus( MyServiceStatusHandle, &MyServiceStatus );
+
+
+    // This is where the service does its work. 
+    Msg( "[MY_SERVICE] Returning the Main Thread \n" ); 
+}
+
+
+void ServiceHelpers_Init()
+{
+	InitializeCriticalSection( &g_CtrlHandlerMutex );
+}
+
+
+bool ServiceHelpers_StartService( const char *pServiceName, void (*pFn)( void *pParam ), void *pParam )
+{
+	// Ok, just run the service.
+	const SERVICE_TABLE_ENTRY DispatchTable[2] = 
+	{
+		{ (char*)pServiceName, MyServiceStart },
+		{ NULL, NULL }
+	};
+
+	g_pInternalServiceFn = pFn;
+	g_pInternalServiceParam = pParam;
+
+	if ( StartServiceCtrlDispatcher( DispatchTable ) ) 
+	{
+		return true;
+	}
+	else
+	{ 											    
+		Msg( "StartServiceCtrlDispatcher error = '%s'\n", GetLastErrorString() ); 
+		return false;
+	}
+}
+
+
+void ServiceHelpers_ExitEarly()
+{
+	EnterCriticalSection( &g_CtrlHandlerMutex );
+	g_bShouldExit = true;
+	LeaveCriticalSection( &g_CtrlHandlerMutex );
+}
+
+
+bool ServiceHelpers_ShouldExit()
+{
+	EnterCriticalSection( &g_CtrlHandlerMutex );
+	bool bRet = g_bShouldExit;
+	LeaveCriticalSection( &g_CtrlHandlerMutex );
+
+	return bRet;
+}
+
+
+char* GetLastErrorString()
+{
+	static char err[2048];
+	
+	LPVOID lpMsgBuf;
+	FormatMessage( 
+		FORMAT_MESSAGE_ALLOCATE_BUFFER | 
+		FORMAT_MESSAGE_FROM_SYSTEM | 
+		FORMAT_MESSAGE_IGNORE_INSERTS,
+		NULL,
+		GetLastError(),
+		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+		(LPTSTR) &lpMsgBuf,
+		0,
+		NULL 
+	);
+
+	strncpy( err, (char*)lpMsgBuf, sizeof( err ) );
+	LocalFree( lpMsgBuf );
+
+	err[ sizeof( err ) - 1 ] = 0;
+
+	return err;
+}
+
+