path: root/sal/osl/w32/dllentry.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifdef _MSC_VER
#pragma warning(push,1) /* disable warnings within system headers */
#endif
#include <windows.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include <tlhelp32.h>
#include <systools/win32/uwinapi.h>
#include <winsock.h>
#include <osl/diagnose.h>
#include <sal/types.h>
#include <float.h>

#include <osl/diagnose.h>
#include <osl/mutex.h>
#include <sal/types.h>

#include "internal/rtllifecycle.h"

//------------------------------------------------------------------------------
// externals
//------------------------------------------------------------------------------

extern DWORD            g_dwTLSTextEncodingIndex;
extern void SAL_CALL    _osl_callThreadKeyCallbackOnThreadDetach(void);
extern CRITICAL_SECTION g_ThreadKeyListCS;
extern oslMutex         g_Mutex;
extern oslMutex         g_CurrentDirectoryMutex;

#ifdef __MINGW32__

typedef void (*func_ptr) (void);
extern func_ptr __CTOR_LIST__[];
extern func_ptr __DTOR_LIST__[];

static void do_startup(void);
static void do_cleanup(void);

#else

/*
This is needed because DllMain is called after static constructors. A DLL's
startup and shutdown sequence looks like this:

_pRawDllMain()
_CRT_INIT()
DllMain()
....
DllMain()
_CRT_INIT()
_pRawDllMain()

*/

static BOOL WINAPI _RawDllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved );
extern BOOL (WINAPI *_pRawDllMain)(HANDLE, DWORD, LPVOID) = _RawDllMain;

#endif

#ifdef __MINGW32__

void
__do_global_dtors (void)
{
  static func_ptr *p = __DTOR_LIST__ + 1;

  /*
   * Call each destructor in the destructor list until a null pointer
   * is encountered.
   */
  while (*p)
    {
      (*(p)) ();
      p++;
    }
}

void
__do_global_ctors (void)
{
  unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];
  unsigned i;

  /*
   * If the first entry in the constructor list is -1 then the list
   * is terminated with a null entry. Otherwise the first entry was
   * the number of pointers in the list.
   */
  if (nptrs == (unsigned long)-1)
    {
      for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++)
    ;
    }

  /*
   * Go through the list backwards calling constructors.
   */
  for (i = nptrs; i >= 1; i--)
    {
      __CTOR_LIST__[i] ();
    }

  /*
   * Register the destructors for processing on exit.
   */
  atexit (__do_global_dtors);
}

static int initialized = 0;

void
__main (void)
{
  if (!initialized)
    {
      initialized = 1;
      do_startup();
      __do_global_ctors ();
    }
}

static void do_startup( void )
{
#else
static BOOL WINAPI _RawDllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved )
{
    (void)hinstDLL; /* avoid warnings */
    (void)lpvReserved; /* avoid warnings */

    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
            {
#endif

#if OSL_DEBUG_LEVEL < 2
                /* Suppress file error messages from system like "Floppy A: not inserted" */
                SetErrorMode( SEM_NOOPENFILEERRORBOX | SEM_FAILCRITICALERRORS );
#endif

                /* initialize global mutex */
                g_Mutex = osl_createMutex();

                /* initialize "current directory" mutex */
                g_CurrentDirectoryMutex = osl_createMutex();

                g_dwTLSTextEncodingIndex = TlsAlloc();
                InitializeCriticalSection( &g_ThreadKeyListCS );

                //We disable floating point exceptions. This is the usual state at program startup
                //but on Windows 98 and ME this is not always the case.
                _control87(_MCW_EM, _MCW_EM);
#ifdef __MINGW32__
        atexit(do_cleanup);
}

void do_cleanup( void )
{
#else
                break;
            }

        case DLL_PROCESS_DETACH:
#endif

            WSACleanup( );

            TlsFree( g_dwTLSTextEncodingIndex );
            DeleteCriticalSection( &g_ThreadKeyListCS );

            osl_destroyMutex( g_Mutex );

            osl_destroyMutex( g_CurrentDirectoryMutex );

#ifndef __MINGW32__

            /*

            On a product build memory management finalization might
            cause a crash without assertion (assertions off) if heap is
            corrupted. But a crash report won't help here because at
            this point all other threads have been terminated and only
            ntdll is on the stack. No chance to find the reason for the
            corrupted heap if so.

            So annoying the user with a crash report is completely useless.

            */

#ifndef DBG_UTIL
            __try
#endif
            {
                /* cleanup locale hashtable */
                rtl_locale_fini();

                /* finalize memory management */
                rtl_memory_fini();
                rtl_cache_fini();
                rtl_arena_fini();
            }
#ifndef DBG_UTIL
            __except( EXCEPTION_EXECUTE_HANDLER )
            {
            }
#endif
            break;
    }

    return TRUE;
#endif
}

static DWORD GetParentProcessId()
{
    DWORD   dwParentProcessId = 0;
    HANDLE  hSnapshot = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );

    if ( IsValidHandle( hSnapshot ) )
    {
        PROCESSENTRY32  pe;
        BOOL            fSuccess;

        ZeroMemory( &pe, sizeof(pe) );
        pe.dwSize = sizeof(pe);
        fSuccess = Process32First( hSnapshot, &pe );

        while( fSuccess )
        {
            if ( GetCurrentProcessId() == pe.th32ProcessID )
            {
                dwParentProcessId = pe.th32ParentProcessID;
                break;
            }

            fSuccess = Process32Next( hSnapshot, &pe );
        }

        CloseHandle( hSnapshot );
    }

    return dwParentProcessId;
}

static DWORD WINAPI ParentMonitorThreadProc( LPVOID lpParam )
{
    DWORD   dwParentProcessId = (DWORD)lpParam;

    HANDLE  hParentProcess = OpenProcess( SYNCHRONIZE, FALSE, dwParentProcessId );
    if ( IsValidHandle( hParentProcess ) )
    {
        if ( WAIT_OBJECT_0 == WaitForSingleObject( hParentProcess, INFINITE ) )
        {
            TerminateProcess( GetCurrentProcess(), 0 );
        }
        CloseHandle( hParentProcess );
    }
    return 0;
}

BOOL WINAPI DllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved )
{
    (void)hinstDLL; /* avoid warning */
    (void)lpvReserved; /* avoid warning */
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
        {
            TCHAR   szBuffer[64];

            // This code will attach the process to it's parent process
            // if the parent process had set the environment variable.
            // The corresponding code (setting the environment variable)
            // is is desktop/win32/source/officeloader.cxx


            DWORD   dwResult = GetEnvironmentVariable( "ATTACHED_PARENT_PROCESSID", szBuffer, sizeof(szBuffer) );

            if ( dwResult && dwResult < sizeof(szBuffer) )
            {
                DWORD   dwThreadId = 0;

                DWORD   dwParentProcessId = (DWORD)atol( szBuffer );

                if ( dwParentProcessId && GetParentProcessId() == dwParentProcessId )
                {
                    // No error check, it works or it does not
                    // Thread should only be started for headless mode, see desktop/win32/source/officeloader.cxx
                    CreateThread( NULL, 0, ParentMonitorThreadProc, (LPVOID)dwParentProcessId, 0, &dwThreadId ); //
                }
            }

            return TRUE;
        }

        case DLL_THREAD_ATTACH:
            break;

        case DLL_THREAD_DETACH:
            _osl_callThreadKeyCallbackOnThreadDetach( );
            break;
    }

    return TRUE;
}

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