wceinit.c

WinCE5.0部分核心源码

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// This source code is licensed under Microsoft Shared Source License
// Version 1.0 for Windows CE.
// For a copy of the license visit http://go.microsoft.com/fwlink/?LinkId=3223.
//
/*****************************************************************************/
/**                            Microsoft Windows                            **/
/*****************************************************************************/

/*

wceinit.c

installation and thread local storage related functions

FILE HISTORY:
	OmarM     14-Sep-2000
	

*/


#include "winsock2p.h"
#include "cxport.h"
#include <perfcomm.h>

extern void FreeLookups();
extern int FreeProviders(uint Flags);
extern void FreeNsProviders();
extern BOOL g_bWSAAsyncCSInit;
extern CRITICAL_SECTION g_WSAAsyncCS;
extern WSAEVENT g_WSAAsyncSelectSignal;

//	Global variables

int					v_FreeSockets;
int					v_NextSockHandle;
LPSOCK_INFO			v_aSockHandles[NUM_SOCKETS];

CRITICAL_SECTION	v_DllCS;
HINSTANCE			v_hDll;
int					v_fCleaningUp;
int					v_fProcessDetached;

HINSTANCE			v_hPackage;
PSecurityFunctionTableW v_IPackage;

EXTERNAL_LOCK(s_NsProvListLock);
EXTERNAL_LOCK(s_NsLookupsLock);
EXTERNAL_LOCK(s_ProviderListLock);

// Debug Zones.
//
#ifdef DEBUG
DBGPARAM dpCurSettings = {
    TEXT("WinSock"), {
    TEXT("Accept"),TEXT("Bind"),TEXT("Connect"),TEXT("Select"),
    TEXT("Recv"),TEXT("Send"),TEXT("Socket"),TEXT("Listen"),
    TEXT("Ioctl"),TEXT("Ssl"),TEXT("Undefined"),TEXT("Misc"),
    TEXT("Alloc"),TEXT("Function"),TEXT("Warning"),TEXT("Error") },
    0x0000C000
};
#endif



//	Static Variables

static DWORD		s_SockTlsSlot = INVALID_TLS_INDEX;
DWORD				s_cDllRefs;


int SOCKAPI sethostname(IN char FAR *pName, IN int cName);

// Get it working for now, can optimize later...


int Started() {
	int	Err;

	if (s_cDllRefs > 0)
		Err = 0;
	else
		Err = WSANOTINITIALISED;

	return Err;

}	// Started()


int WSAAPI WSAStartup(
    IN WORD wVersionRequired,
    OUT LPWSADATA lpWSAData) {

    int		Err = 0;
    WORD	Major, Minor, OfferMajor, OfferMinor;


	if (v_fProcessDetached)
		Err = WSAENETDOWN;

    if (!v_hDll)
		Err = WSASYSNOTREADY;

	if (! Err) {
		CTEGetLock(&v_DllCS, 0);
		if (v_fCleaningUp)
			Err = WSASYSNOTREADY;
		CTEFreeLock(&v_DllCS, 0);
	}

	if (Err)
		goto Exit;
	
	Major = LOBYTE(wVersionRequired);
	Minor = HIBYTE(wVersionRequired);

	if (Major < 1) {
		Err = WSAVERNOTSUPPORTED;
		goto Exit;
	} else if (1 == Major) {
		OfferMajor = 1;
		if (Minor <= 1)
			OfferMinor = Minor;
		else
			OfferMinor = 1;
	} else {
		OfferMajor = 2;
		if (Major > 2 || Minor > 2)
			OfferMinor = 2;
		else
			OfferMinor = Minor;
	}

	__try {
		lpWSAData->wVersion = MAKEWORD(OfferMajor, OfferMinor);
		lpWSAData->wHighVersion = WINSOCK_VERSION;
		strcpy(lpWSAData->szDescription, "Winsock 2.2");
		lpWSAData->szSystemStatus[0]= '\0';

		// the following fields are to be ignored by Winsock 2 but fill them
		// for Winsock 1 apps
		// Two new socket options are introduced to supply provider-specific 
		// information: SO_MAX_MSG_SIZE (replaces the iMaxUdpDg element) and 
		// PVD_CONFIG (allows other provider-specific configuration to occur)

		lpWSAData->iMaxUdpDg = 0;
		
		if (1 == Major) {
			lpWSAData->iMaxSockets = NUM_SOCKETS;
			lpWSAData->lpVendorInfo = NULL;
		} else {
			lpWSAData->iMaxSockets = 0;
			// we no longer set lpVendorInfo b/c of the following note in NT

    // The following line is commented-out due to annoying and totally
    // nasty alignment problems in WINSOCK[2].H. The exact location of
    // the lpVendorInfo field of the WSAData structure is dependent on
    // the structure alignment used when compiling the source. Since we
    // cannot change the structure alignment of existing apps, the best
    // way to handle this mess is to just not set this value. This turns
    // out to not be too bad a solution, as neither the WinNT nor the Win95
    // WinSock implementations set this value, and nobody appears to pay
    // any attention to it anyway.
	        
	        // lpWSAData->lpVendorInfo = NULL;
			
		}
	}

	__except(EXCEPTION_EXECUTE_HANDLER) {
		Err = WSAEFAULT;
	}

Exit:
	if (0 == Err) {
		CTEGetLock(&v_DllCS, 0);
		s_cDllRefs++;
		CTEFreeLock(&v_DllCS, 0);
	}

	return Err;

}	// WSAStartup()


int WSAAPI WSACleanup() {
	int	Err = 0;
	int	fDelete = FALSE;

	if (v_fProcessDetached) {
		Err = WSAENETDOWN;
		goto Exit;
	}
	
	CTEGetLock(&v_DllCS, 0);
	if ((0 == s_cDllRefs) || (NULL == v_hDll)) {
		Err = WSANOTINITIALISED;
	} else {
		if (0 == --s_cDllRefs) {
			fDelete = v_fCleaningUp = TRUE;
		}
	}
	CTEFreeLock(&v_DllCS, 0);

	// technically we should do this before freeing v_DllCS
	// but an app shouldn't usually be calling startup and cleanup right
	// one after the other
	if (fDelete) {
		CloseAllSockets();
		FreeLookups();
		FreeProviders(0);
		FreeNsProviders();
		v_fCleaningUp = FALSE;
	}

Exit:
	return Err;

}	// WSACleanup()


BOOL GetThreadData (LPSOCK_THREAD *ppThread) {
	LPSOCK_THREAD	pThread;

	if (s_SockTlsSlot != INVALID_TLS_INDEX) {
#ifdef DEBUG
		if ((DWORD)GetOwnerProcess() != GetCurrentProcessId()) {
			DEBUGMSG (ZONE_WARN,
					  (TEXT("GetCurrentProcessId=0x%X ")
					   TEXT("GetCallerProcess=0x%X ")
					   TEXT("GetOwnerProcess=0x%X\r\n"),
					   GetCurrentProcessId(), GetCallerProcess(),
					   GetOwnerProcess()));
		}
#endif
		
		ASSERT((DWORD)GetOwnerProcess() == GetCurrentProcessId());

		pThread = (LPSOCK_THREAD)TlsGetValue(s_SockTlsSlot);
		if (NULL == pThread) {
			// Try to allocate the data.
			pThread = DllAllocMem (sizeof(SOCK_THREAD));
			if (pThread) {
				memset ((char *)pThread, 0, sizeof(SOCK_THREAD));
			}
			TlsSetValue (s_SockTlsSlot, (LPVOID)pThread);
		}
		if (pThread) {
			*ppThread = pThread;
			return TRUE;
		}
	}
	// Some error occured.
	return FALSE;
}


BOOL
__stdcall
dllentry (
    HANDLE  hinstDLL, 
    DWORD   Op,
    LPVOID  lpvReserved
    )
{

    switch (Op) {
    case DLL_PROCESS_ATTACH:
        
        DEBUGREGISTER(hinstDLL);
        DEBUGMSG (ZONE_MISC, (TEXT("WS2: dllentry()\r\n")));
        CTEInitLock(&v_DllCS);
        CTEInitLock(&s_NsProvListLock);
        CTEInitLock(&s_NsLookupsLock);
        CTEInitLock(&s_ProviderListLock);
        
        s_SockTlsSlot = TlsAlloc();
        
        if(INVALID_TLS_INDEX == s_SockTlsSlot) {
            RETAILMSG(1, (TEXT("dllentry: TlsAlloc failed!!!\r\n")));
            return FALSE;
        }

        PerfCommInit();

        v_hDll = hinstDLL;
        break;
    
    case DLL_PROCESS_DETACH:
    
        if (v_hDll) {
            v_fProcessDetached = TRUE;
            CloseAllSockets();
            FreeLookups();
            FreeProviders(0);
            FreeNsProviders();
            CTEDeleteLock(&v_DllCS);
            CTEDeleteLock(&s_NsProvListLock);
            CTEDeleteLock(&s_NsLookupsLock);
            CTEDeleteLock(&s_ProviderListLock);            
            TlsFree(s_SockTlsSlot);
            
            if (g_bWSAAsyncCSInit) {
                g_bWSAAsyncCSInit = FALSE;
                DeleteCriticalSection(&g_WSAAsyncCS);
                CloseHandle(g_WSAAsyncSelectSignal);
            }

            PerfCommDeInit();
        }
        break;
    
    case DLL_THREAD_DETACH:
    
        if (s_SockTlsSlot != INVALID_TLS_INDEX) {
            LPSOCK_THREAD    pThread;
            
            pThread = (LPSOCK_THREAD)TlsGetValue(s_SockTlsSlot);
            if (pThread) {
                // Free the sock data
                DllFreeMem (pThread);
                TlsSetValue (s_SockTlsSlot, (LPVOID)0);
            }
        }
        break;

    case DLL_THREAD_ATTACH:
        // Don't bother allocating the slot data until they use sockets.
        // fall-thru
        default:
        break;
    }
    return TRUE;
}

#include <perfcomm.c>