389-ds-base/ldap/servers/plugins/cos/dllmain.c

/** BEGIN COPYRIGHT BLOCK
 * Copyright 2001 Sun Microsystems, Inc.
 * Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/
/*
 * Microsoft Windows specifics for BACK-LDBM DLL
 */
#include "ldap.h"
#include "lber.h"


#ifdef _WIN32
/* Lifted from Q125688
 * How to Port a 16-bit DLL to a Win32 DLL
 * on the MSVC 4.0 CD
 */
BOOL WINAPI DllMain (HANDLE hModule, DWORD fdwReason, LPVOID lpReserved)
{
	WSADATA	wsadata;

	switch (fdwReason)
	{
	case DLL_PROCESS_ATTACH:
		 /* Code from LibMain inserted here.  Return TRUE to keep the
		    DLL loaded or return FALSE to fail loading the DLL.

		    You may have to modify the code in your original LibMain to
		    account for the fact that it may be called more than once.
		    You will get one DLL_PROCESS_ATTACH for each process that
		    loads the DLL. This is different from LibMain which gets
		    called only once when the DLL is loaded. The only time this
		    is critical is when you are using shared data sections.
		    If you are using shared data sections for statically
		    allocated data, you will need to be careful to initialize it
		    only once. Check your code carefully.

		    Certain one-time initializations may now need to be done for
		    each process that attaches. You may also not need code from
		    your original LibMain because the operating system may now
		    be doing it for you.
		 */
		/*
		 * 16 bit code calls UnlockData()
		 * which is mapped to UnlockSegment in windows.h
		 * in 32 bit world UnlockData is not defined anywhere
		 * UnlockSegment is mapped to GlobalUnfix in winbase.h
		 * and the docs for both UnlockSegment and GlobalUnfix say 
		 * ".. function is oboslete.  Segments have no meaning 
		 *  in the 32-bit environment".  So we do nothing here.
		 */

		if( errno = WSAStartup(0x0101, &wsadata ) != 0 )
			return FALSE;

		break;

	case DLL_THREAD_ATTACH:
		/* Called each time a thread is created in a process that has
		   already loaded (attached to) this DLL. Does not get called
		   for each thread that exists in the process before it loaded
		   the DLL.

		   Do thread-specific initialization here.
		*/
		break;

	case DLL_THREAD_DETACH:
		/* Same as above, but called when a thread in the process
		   exits.

		   Do thread-specific cleanup here.
		*/
		break;

	case DLL_PROCESS_DETACH:
		/* Code from _WEP inserted here.  This code may (like the
		   LibMain) not be necessary.  Check to make certain that the
		   operating system is not doing it for you.
		*/
		WSACleanup();

		break;
	}
	/* The return value is only used for DLL_PROCESS_ATTACH; all other
	conditions are ignored.  */
	return TRUE;   // successful DLL_PROCESS_ATTACH
}
#else
int CALLBACK
LibMain( HINSTANCE hinst, WORD wDataSeg, WORD cbHeapSize, LPSTR lpszCmdLine )
{
	/*UnlockData( 0 );*/
 	return( 1 );
}
#endif