src/win32/specific.c

   1 /*****************************************************************************
   2  * specific.c: Win32 specific initilization
   3  *****************************************************************************
   4  * Copyright (C) 2001-2004, 2010 VLC authors and VideoLAN
   5  *
   6  * Authors: Samuel Hocevar <sam@zoy.org>
   7  *          Gildas Bazin <gbazin@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #ifndef UNICODE
  29 # define UNICODE
  30 #endif
  31 #include <vlc_common.h>
  32 #include "libvlc.h"
  33 #include "../lib/libvlc_internal.h"
  34 #include "config/vlc_getopt.h"
  35
  36 #include <mmsystem.h>
  37 #include <winsock.h>
  38 #if VLC_WINSTORE_APP && !defined(__MINGW32__)
  39 typedef UINT MMRESULT;
  40 #endif
  41
  42 DWORD LoadLibraryFlags = 0;
  43
  44 static int system_InitWSA(int hi, int lo)
  45 {
  46     WSADATA data;
  47
  48     if (WSAStartup(MAKEWORD(hi, lo), &data) == 0)
  49     {
  50         if (LOBYTE(data.wVersion) == 2 && HIBYTE(data.wVersion) == 2)
  51             return 0;
  52         /* Winsock DLL is not usable */
  53         WSACleanup( );
  54     }
  55     return -1;
  56 }
  57
  58 /**
  59  * Initializes MME timer, Winsock.
  60  */
  61 static HMODULE hWinmm = INVALID_HANDLE_VALUE;
  62 void system_Init(void)
  63 {
  64     hWinmm = LoadLibrary(TEXT("winmm.dll"));
  65     if (hWinmm)
  66     {
  67         MMRESULT (WINAPI * timeBeginPeriod)(UINT);
  68         timeBeginPeriod = (void*)GetProcAddress(hWinmm, "timeBeginPeriod");
  69         if (timeBeginPeriod)
  70             timeBeginPeriod(5);
  71     }
  72
  73     if (system_InitWSA(2, 2) && system_InitWSA(1, 1))
  74         fputs("Error: cannot initialize Winsocks\n", stderr);
  75
  76 #if !VLC_WINSTORE_APP
  77 # if (_WIN32_WINNT < _WIN32_WINNT_WIN8)
  78     if (GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
  79                                        "SetDefaultDllDirectories") != NULL)
  80 # endif /* FIXME: not reentrant */
  81         LoadLibraryFlags = LOAD_LIBRARY_SEARCH_SYSTEM32;
  82 #endif
  83 }
  84
  85 /*****************************************************************************
  86  * system_Configure: check for system specific configuration options.
  87  *****************************************************************************/
  88
  89 /* Must be same as in modules/control/win_msg.c */
  90 typedef struct
  91 {
  92     int argc;
  93     int enqueue;
  94     char data[];
  95 } vlc_ipc_data_t;
  96
  97 void system_Configure( libvlc_int_t *p_this, int i_argc, const char *const ppsz_argv[] )
  98 {
  99 #if !VLC_WINSTORE_APP
 100     /* Raise default priority of the current process */
 101 #ifndef ABOVE_NORMAL_PRIORITY_CLASS
 102 #   define ABOVE_NORMAL_PRIORITY_CLASS 0x00008000
 103 #endif
 104     if( var_InheritBool( p_this, "high-priority" ) )
 105     {
 106         if( SetPriorityClass( GetCurrentProcess(), ABOVE_NORMAL_PRIORITY_CLASS )
 107              || SetPriorityClass( GetCurrentProcess(), HIGH_PRIORITY_CLASS ) )
 108         {
 109             msg_Dbg( p_this, "raised process priority" );
 110         }
 111         else
 112         {
 113             msg_Dbg( p_this, "could not raise process priority" );
 114         }
 115     }
 116
 117     if( var_InheritBool( p_this, "one-instance" )
 118      || ( var_InheritBool( p_this, "one-instance-when-started-from-file" )
 119        && var_InheritBool( p_this, "started-from-file" ) ) )
 120     {
 121         HANDLE hmutex;
 122
 123         msg_Info( p_this, "one instance mode ENABLED");
 124
 125         /* Use a named mutex to check if another instance is already running */
 126         if( !( hmutex = CreateMutex( 0, TRUE, L"VLC ipc " TEXT(VERSION) ) ) )
 127         {
 128             /* Failed for some reason. Just ignore the option and go on as
 129              * normal. */
 130             msg_Err( p_this, "one instance mode DISABLED "
 131                      "(mutex couldn't be created)" );
 132             return;
 133         }
 134
 135         if( GetLastError() != ERROR_ALREADY_EXISTS )
 136         {
 137             libvlc_InternalAddIntf( p_this, "win_msg,none" );
 138             /* Initialization done.
 139              * Release the mutex to unblock other instances */
 140             ReleaseMutex( hmutex );
 141         }
 142         else
 143         {
 144             /* Another instance is running */
 145
 146             HWND ipcwindow;
 147
 148             /* Wait until the 1st instance is initialized */
 149             WaitForSingleObject( hmutex, INFINITE );
 150
 151             /* Locate the window created by the IPC helper thread of the
 152              * 1st instance */
 153             if( !( ipcwindow = FindWindow( 0, L"VLC ipc " TEXT(VERSION) ) ) )
 154             {
 155                 msg_Err( p_this, "one instance mode DISABLED "
 156                          "(couldn't find 1st instance of program)" );
 157                 ReleaseMutex( hmutex );
 158                 return;
 159             }
 160
 161             /* We assume that the remaining parameters are filenames
 162              * and their input options */
 163             if( i_argc > 0 )
 164             {
 165                 COPYDATASTRUCT wm_data;
 166                 int i_opt;
 167                 vlc_ipc_data_t *p_data;
 168                 size_t i_data = sizeof (*p_data);
 169
 170                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 171                 {
 172                     i_data += sizeof (size_t);
 173                     i_data += strlen( ppsz_argv[ i_opt ] ) + 1;
 174                 }
 175
 176                 p_data = malloc( i_data );
 177                 p_data->argc = i_argc;
 178                 p_data->enqueue = var_InheritBool( p_this, "playlist-enqueue" );
 179                 i_data = 0;
 180                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 181                 {
 182                     size_t i_len = strlen( ppsz_argv[ i_opt ] ) + 1;
 183                     /* Windows will never switch to an architecture
 184                      * with stronger alignment requirements, right. */
 185                     *((size_t *)(p_data->data + i_data)) = i_len;
 186                     i_data += sizeof (size_t);
 187                     memcpy( &p_data->data[i_data], ppsz_argv[ i_opt ], i_len );
 188                     i_data += i_len;
 189                 }
 190                 i_data += sizeof (*p_data);
 191
 192                 /* Send our playlist items to the 1st instance */
 193                 wm_data.dwData = 0;
 194                 wm_data.cbData = i_data;
 195                 wm_data.lpData = p_data;
 196                 SendMessage( ipcwindow, WM_COPYDATA, 0, (LPARAM)&wm_data );
 197             }
 198
 199             /* Initialization done.
 200              * Release the mutex to unblock other instances */
 201             ReleaseMutex( hmutex );
 202
 203             /* Bye bye */
 204             system_End( );
 205             exit( 0 );
 206         }
 207     }
 208 #endif
 209 }
 210
 211 /**
 212  * Cleans up after system_Init() and system_Configure().
 213  */
 214 void system_End(void)
 215 {
 216     if (hWinmm)
 217     {
 218         MMRESULT (WINAPI * timeEndPeriod)(UINT);
 219         timeEndPeriod = (void*)GetProcAddress(hWinmm, "timeEndPeriod");
 220         if (timeEndPeriod)
 221             timeEndPeriod(5);
 222         FreeLibrary(hWinmm);
 223     }
 224
 225     /* XXX: In theory, we should not call this if WSAStartup() failed. */
 226     WSACleanup();
 227 }