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 void system_Init(void)
  62 {
  63     if (system_InitWSA(2, 2) && system_InitWSA(1, 1))
  64         fputs("Error: cannot initialize Winsocks\n", stderr);
  65
  66 #if !VLC_WINSTORE_APP
  67 # if (_WIN32_WINNT < _WIN32_WINNT_WIN8)
  68     if (GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
  69                                        "SetDefaultDllDirectories") != NULL)
  70 # endif /* FIXME: not reentrant */
  71         LoadLibraryFlags = LOAD_LIBRARY_SEARCH_SYSTEM32;
  72 #endif
  73 }
  74
  75 /*****************************************************************************
  76  * system_Configure: check for system specific configuration options.
  77  *****************************************************************************/
  78
  79 /* Must be same as in modules/control/win_msg.c */
  80 typedef struct
  81 {
  82     int argc;
  83     int enqueue;
  84     char data[];
  85 } vlc_ipc_data_t;
  86
  87 void system_Configure( libvlc_int_t *p_this, int i_argc, const char *const ppsz_argv[] )
  88 {
  89 #if !VLC_WINSTORE_APP
  90     if( var_InheritBool( p_this, "one-instance" )
  91      || ( var_InheritBool( p_this, "one-instance-when-started-from-file" )
  92        && var_InheritBool( p_this, "started-from-file" ) ) )
  93     {
  94         HANDLE hmutex;
  95
  96         msg_Info( p_this, "one instance mode ENABLED");
  97
  98         /* Use a named mutex to check if another instance is already running */
  99         if( !( hmutex = CreateMutex( 0, TRUE, L"VLC ipc " TEXT(VERSION) ) ) )
 100         {
 101             /* Failed for some reason. Just ignore the option and go on as
 102              * normal. */
 103             msg_Err( p_this, "one instance mode DISABLED "
 104                      "(mutex couldn't be created)" );
 105             return;
 106         }
 107
 108         if( GetLastError() != ERROR_ALREADY_EXISTS )
 109         {
 110             libvlc_InternalAddIntf( p_this, "win_msg,none" );
 111             /* Initialization done.
 112              * Release the mutex to unblock other instances */
 113             ReleaseMutex( hmutex );
 114         }
 115         else
 116         {
 117             /* Another instance is running */
 118
 119             HWND ipcwindow;
 120
 121             /* Wait until the 1st instance is initialized */
 122             WaitForSingleObject( hmutex, INFINITE );
 123
 124             /* Locate the window created by the IPC helper thread of the
 125              * 1st instance */
 126             if( !( ipcwindow = FindWindow( 0, L"VLC ipc " TEXT(VERSION) ) ) )
 127             {
 128                 msg_Err( p_this, "one instance mode DISABLED "
 129                          "(couldn't find 1st instance of program)" );
 130                 ReleaseMutex( hmutex );
 131                 return;
 132             }
 133
 134             /* We assume that the remaining parameters are filenames
 135              * and their input options */
 136             if( i_argc > 0 )
 137             {
 138                 COPYDATASTRUCT wm_data;
 139                 int i_opt;
 140                 vlc_ipc_data_t *p_data;
 141                 size_t i_data = sizeof (*p_data);
 142
 143                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 144                 {
 145                     i_data += sizeof (size_t);
 146                     i_data += strlen( ppsz_argv[ i_opt ] ) + 1;
 147                 }
 148
 149                 p_data = malloc( i_data );
 150                 p_data->argc = i_argc;
 151                 p_data->enqueue = var_InheritBool( p_this, "playlist-enqueue" );
 152                 i_data = 0;
 153                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 154                 {
 155                     size_t i_len = strlen( ppsz_argv[ i_opt ] ) + 1;
 156                     /* Windows will never switch to an architecture
 157                      * with stronger alignment requirements, right. */
 158                     *((size_t *)(p_data->data + i_data)) = i_len;
 159                     i_data += sizeof (size_t);
 160                     memcpy( &p_data->data[i_data], ppsz_argv[ i_opt ], i_len );
 161                     i_data += i_len;
 162                 }
 163                 i_data += sizeof (*p_data);
 164
 165                 /* Send our playlist items to the 1st instance */
 166                 wm_data.dwData = 0;
 167                 wm_data.cbData = i_data;
 168                 wm_data.lpData = p_data;
 169                 SendMessage( ipcwindow, WM_COPYDATA, 0, (LPARAM)&wm_data );
 170             }
 171
 172             /* Initialization done.
 173              * Release the mutex to unblock other instances */
 174             ReleaseMutex( hmutex );
 175
 176             /* Bye bye */
 177             system_End( );
 178             exit( 0 );
 179         }
 180     }
 181 #endif
 182 }
 183
 184 /**
 185  * Cleans up after system_Init() and system_Configure().
 186  */
 187 void system_End(void)
 188 {
 189     /* XXX: In theory, we should not call this if WSAStartup() failed. */
 190     WSACleanup();
 191 }