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 static int system_InitWSA(int hi, int lo)
  43 {
  44     WSADATA data;
  45
  46     if (WSAStartup(MAKEWORD(hi, lo), &data) == 0)
  47     {
  48         if (LOBYTE(data.wVersion) == 2 && HIBYTE(data.wVersion) == 2)
  49             return 0;
  50         /* Winsock DLL is not usable */
  51         WSACleanup( );
  52     }
  53     return -1;
  54 }
  55
  56 /**
  57  * Initializes MME timer, Winsock.
  58  */
  59 void system_Init(void)
  60 {
  61     if (system_InitWSA(2, 2) && system_InitWSA(1, 1))
  62         fputs("Error: cannot initialize Winsocks\n", stderr);
  63 }
  64
  65 /*****************************************************************************
  66  * system_Configure: check for system specific configuration options.
  67  *****************************************************************************/
  68
  69 /* Must be same as in modules/control/win_msg.c */
  70 typedef struct
  71 {
  72     int argc;
  73     int enqueue;
  74     char data[];
  75 } vlc_ipc_data_t;
  76
  77 void system_Configure( libvlc_int_t *p_this, int i_argc, const char *const ppsz_argv[] )
  78 {
  79 #if !VLC_WINSTORE_APP
  80     if( var_InheritBool( p_this, "one-instance" )
  81      || ( var_InheritBool( p_this, "one-instance-when-started-from-file" )
  82        && var_InheritBool( p_this, "started-from-file" ) ) )
  83     {
  84         HANDLE hmutex;
  85
  86         msg_Info( p_this, "one instance mode ENABLED");
  87
  88         /* Use a named mutex to check if another instance is already running */
  89         if( !( hmutex = CreateMutex( 0, TRUE, L"VLC ipc " TEXT(VERSION) ) ) )
  90         {
  91             /* Failed for some reason. Just ignore the option and go on as
  92              * normal. */
  93             msg_Err( p_this, "one instance mode DISABLED "
  94                      "(mutex couldn't be created)" );
  95             return;
  96         }
  97
  98         if( GetLastError() != ERROR_ALREADY_EXISTS )
  99         {
 100             libvlc_InternalAddIntf( p_this, "win_msg,none" );
 101             /* Initialization done.
 102              * Release the mutex to unblock other instances */
 103             ReleaseMutex( hmutex );
 104         }
 105         else
 106         {
 107             /* Another instance is running */
 108
 109             HWND ipcwindow;
 110
 111             /* Wait until the 1st instance is initialized */
 112             WaitForSingleObject( hmutex, INFINITE );
 113
 114             /* Locate the window created by the IPC helper thread of the
 115              * 1st instance */
 116             if( !( ipcwindow = FindWindow( 0, L"VLC ipc " TEXT(VERSION) ) ) )
 117             {
 118                 msg_Err( p_this, "one instance mode DISABLED "
 119                          "(couldn't find 1st instance of program)" );
 120                 ReleaseMutex( hmutex );
 121                 return;
 122             }
 123
 124             /* We assume that the remaining parameters are filenames
 125              * and their input options */
 126             if( i_argc > 0 )
 127             {
 128                 COPYDATASTRUCT wm_data;
 129                 int i_opt;
 130                 vlc_ipc_data_t *p_data;
 131                 size_t i_data = sizeof (*p_data);
 132
 133                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 134                 {
 135                     i_data += sizeof (size_t);
 136                     i_data += strlen( ppsz_argv[ i_opt ] ) + 1;
 137                 }
 138
 139                 p_data = malloc( i_data );
 140                 p_data->argc = i_argc;
 141                 p_data->enqueue = var_InheritBool( p_this, "playlist-enqueue" );
 142                 i_data = 0;
 143                 for( i_opt = 0; i_opt < i_argc; i_opt++ )
 144                 {
 145                     size_t i_len = strlen( ppsz_argv[ i_opt ] ) + 1;
 146                     /* Windows will never switch to an architecture
 147                      * with stronger alignment requirements, right. */
 148                     *((size_t *)(p_data->data + i_data)) = i_len;
 149                     i_data += sizeof (size_t);
 150                     memcpy( &p_data->data[i_data], ppsz_argv[ i_opt ], i_len );
 151                     i_data += i_len;
 152                 }
 153                 i_data += sizeof (*p_data);
 154
 155                 /* Send our playlist items to the 1st instance */
 156                 wm_data.dwData = 0;
 157                 wm_data.cbData = i_data;
 158                 wm_data.lpData = p_data;
 159                 SendMessage( ipcwindow, WM_COPYDATA, 0, (LPARAM)&wm_data );
 160             }
 161
 162             /* Initialization done.
 163              * Release the mutex to unblock other instances */
 164             ReleaseMutex( hmutex );
 165
 166             /* Bye bye */
 167             system_End( );
 168             exit( 0 );
 169         }
 170     }
 171 #endif
 172 }
 173
 174 /**
 175  * Cleans up after system_Init() and system_Configure().
 176  */
 177 void system_End(void)
 178 {
 179     /* XXX: In theory, we should not call this if WSAStartup() failed. */
 180     WSACleanup();
 181 }