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 <winsock2.h>
  38
  39 static int system_InitWSA(int hi, int lo)
  40 {
  41     WSADATA data;
  42
  43     if (WSAStartup(MAKEWORD(hi, lo), &data) == 0)
  44     {
  45         if (LOBYTE(data.wVersion) == 2 && HIBYTE(data.wVersion) == 2)
  46             return 0;
  47         /* Winsock DLL is not usable */
  48         WSACleanup( );
  49     }
  50     return -1;
  51 }
  52
  53 /**
  54  * Initializes MME timer, Winsock.
  55  */
  56 void system_Init(void)
  57 {
  58     if (system_InitWSA(2, 2) && system_InitWSA(1, 1))
  59         fputs("Error: cannot initialize Winsocks\n", stderr);
  60 }
  61
  62 /*****************************************************************************
  63  * system_Configure: check for system specific configuration options.
  64  *****************************************************************************/
  65
  66 /* Must be same as in modules/control/win_msg.c */
  67 typedef struct
  68 {
  69     int argc;
  70     int enqueue;
  71     char data[];
  72 } vlc_ipc_data_t;
  73
  74 void system_Configure( libvlc_int_t *p_this, int i_argc, const char *const ppsz_argv[] )
  75 {
  76 #if !VLC_WINSTORE_APP
  77     if( var_InheritBool( p_this, "one-instance" )
  78      || ( var_InheritBool( p_this, "one-instance-when-started-from-file" )
  79        && var_InheritBool( p_this, "started-from-file" ) ) )
  80     {
  81         HANDLE hmutex;
  82
  83         msg_Info( p_this, "one instance mode ENABLED");
  84
  85         /* Use a named mutex to check if another instance is already running */
  86         if( !( hmutex = CreateMutex( 0, TRUE, L"VLC ipc " TEXT(VERSION) ) ) )
  87         {
  88             /* Failed for some reason. Just ignore the option and go on as
  89              * normal. */
  90             msg_Err( p_this, "one instance mode DISABLED "
  91                      "(mutex couldn't be created)" );
  92             return;
  93         }
  94
  95         if( GetLastError() != ERROR_ALREADY_EXISTS )
  96         {
  97             libvlc_InternalAddIntf( p_this, "win_msg,none" );
  98             /* Initialization done.
  99              * Release the mutex to unblock other instances */
 100             ReleaseMutex( hmutex );
 101         }
 102         else
 103         {
 104             /* Another instance is running */
 105
 106             HWND ipcwindow;
 107
 108             /* Wait until the 1st instance is initialized */
 109             WaitForSingleObject( hmutex, INFINITE );
 110
 111             /* Locate the window created by the IPC helper thread of the
 112              * 1st instance */
 113             if( !( ipcwindow = FindWindow( 0, L"VLC ipc " TEXT(VERSION) ) ) )
 114             {
 115                 msg_Err( p_this, "one instance mode DISABLED "
 116                          "(couldn't find 1st instance of program)" );
 117                 ReleaseMutex( hmutex );
 118                 return;
 119             }
 120
 121             /* We assume that the remaining parameters are filenames
 122              * and their input options */
 123             if( i_argc > 0 )
 124             {
 125                 COPYDATASTRUCT wm_data;
 126                 int i_opt;
 127                 vlc_ipc_data_t *p_data;
 128                 size_t i_data = sizeof (*p_data);
 129
 130                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 131                 {
 132                     i_data += sizeof (size_t);
 133                     i_data += strlen( ppsz_argv[ i_opt ] ) + 1;
 134                 }
 135
 136                 p_data = malloc( i_data );
 137                 p_data->argc = i_argc;
 138                 p_data->enqueue = var_InheritBool( p_this, "playlist-enqueue" );
 139                 i_data = 0;
 140                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 141                 {
 142                     size_t i_len = strlen( ppsz_argv[ i_opt ] ) + 1;
 143                     /* Windows will never switch to an architecture
 144                      * with stronger alignment requirements, right. */
 145                     *((size_t *)(p_data->data + i_data)) = i_len;
 146                     i_data += sizeof (size_t);
 147                     memcpy( &p_data->data[i_data], ppsz_argv[ i_opt ], i_len );
 148                     i_data += i_len;
 149                 }
 150                 i_data += sizeof (*p_data);
 151
 152                 /* Send our playlist items to the 1st instance */
 153                 wm_data.dwData = 0;
 154                 wm_data.cbData = i_data;
 155                 wm_data.lpData = p_data;
 156                 SendMessage( ipcwindow, WM_COPYDATA, 0, (LPARAM)&wm_data );
 157             }
 158
 159             /* Initialization done.
 160              * Release the mutex to unblock other instances */
 161             ReleaseMutex( hmutex );
 162
 163             /* Bye bye */
 164             system_End( );
 165             exit( 0 );
 166         }
 167     }
 168 #endif
 169 }
 170
 171 /**
 172  * Cleans up after system_Init() and system_Configure().
 173  */
 174 void system_End(void)
 175 {
 176     /* XXX: In theory, we should not call this if WSAStartup() failed. */
 177     WSACleanup();
 178 }