src/msw/gsockmsw.c

   1 /* -------------------------------------------------------------------------
   2  * Project: GSocket (Generic Socket)
   3  * Name:    gsockmsw.c
   4  * Author:  Guillermo Rodriguez Garcia <guille@iies.es>
   5  * Purpose: GSocket GUI-specific MSW code
   6  * CVSID:   $Id$
   7  * -------------------------------------------------------------------------
   8  */
   9
  10 /*
  11  * PLEASE don't put C++ comments here - this is a C source file.
  12  */
  13
  14 /* including rasasync.h (included from windows.h itself included from
  15  * wx/setup.h and/or winsock.h results in this warning for
  16  * RPCNOTIFICATION_ROUTINE
  17  */
  18 #ifdef _MSC_VER
  19 #  pragma warning(disable:4115) /* named type definition in parentheses */
  20 #endif
  21
  22 #ifndef __GSOCKET_STANDALONE__
  23 #include "wx/defs.h"
  24 #include "wx/setup.h"
  25 #endif
  26
  27 #if wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__)
  28
  29 #ifndef __GSOCKET_STANDALONE__
  30
  31 #include "wx/msw/gsockmsw.h"
  32 #include "wx/gsocket.h"
  33
  34 #define INSTANCE wxGetInstance()
  35
  36 #else
  37
  38 #include "gsockmsw.h"
  39 #include "gsocket.h"
  40
  41 /* If not using wxWindows, a global var called hInst must
  42  * be available and it must contain the app's instance
  43  * handle.
  44  */
  45 #define INSTANCE hInst
  46
  47 #endif /* __GSOCKET_STANDALONE__ */
  48
  49 #include <assert.h>
  50 #include <string.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <stddef.h>
  54 #include <ctype.h>
  55
  56 #include <winsock.h>
  57
  58 #ifdef _MSC_VER
  59 #  pragma warning(default:4115) /* named type definition in parentheses */
  60 #endif
  61
  62 #define CLASSNAME  "_GSocket_Internal_Window_Class"
  63 #define WINDOWNAME "_GSocket_Internal_Window_Name"
  64
  65 /* Maximum number of different GSocket objects at a given time.
  66  * This value can be modified at will, but it CANNOT be greater
  67  * than (0x7FFF - WM_USER + 1)
  68  */
  69 #define MAXSOCKETS 1024
  70
  71 #if (MAXSOCKETS > (0x7FFF - WM_USER + 1))
  72 #error "MAXSOCKETS is too big!"
  73 #endif
  74
  75
  76 /* Global variables */
  77
  78 extern HINSTANCE INSTANCE;
  79 static HWND hWin;
  80 static CRITICAL_SECTION critical;
  81 static GSocket* socketList[MAXSOCKETS];
  82 static int firstAvailable;
  83
  84 /* Global initializers */
  85
  86 int GSocket_Init(void)
  87 {
  88   WSADATA wsaData;
  89   WNDCLASS winClass;
  90   int i;
  91
  92   /* Create internal window for event notifications */
  93   winClass.style         = 0;
  94   winClass.lpfnWndProc   = _GSocket_Internal_WinProc;
  95   winClass.cbClsExtra    = 0;
  96   winClass.cbWndExtra    = 0;
  97   winClass.hInstance     = INSTANCE;
  98   winClass.hIcon         = (HICON) NULL;
  99   winClass.hCursor       = (HCURSOR) NULL;
 100   winClass.hbrBackground = (HBRUSH) NULL;
 101   winClass.lpszMenuName  = (LPCTSTR) NULL;
 102   winClass.lpszClassName = CLASSNAME;
 103
 104   RegisterClass(&winClass);
 105   hWin = CreateWindow(CLASSNAME,
 106                       WINDOWNAME,
 107                       0, 0, 0, 0, 0,
 108                       (HWND) NULL, (HMENU) NULL, INSTANCE, (LPVOID) NULL);
 109
 110   if (!hWin) return FALSE;
 111
 112   /* Initialize socket list */
 113   InitializeCriticalSection(&critical);
 114
 115   for (i = 0; i < MAXSOCKETS; i++)
 116   {
 117     socketList[i] = NULL;
 118   }
 119   firstAvailable = 0;
 120
 121   /* Initialize WinSocket */
 122   return (WSAStartup((1 << 8) | 1, &wsaData) == 0);
 123 }
 124
 125 void GSocket_Cleanup(void)
 126 {
 127   /* Destroy internal window */
 128   DestroyWindow(hWin);
 129   UnregisterClass(CLASSNAME, INSTANCE);
 130
 131   /* Delete critical section */
 132   DeleteCriticalSection(&critical);
 133
 134   /* Cleanup WinSocket */
 135   WSACleanup();
 136 }
 137
 138 /* Per-socket GUI initialization / cleanup */
 139
 140 int _GSocket_GUI_Init(GSocket *socket)
 141 {
 142   int i;
 143
 144   /* Allocate a new message number for this socket */
 145   EnterCriticalSection(&critical);
 146
 147   i = firstAvailable;
 148   while (socketList[i] != NULL)
 149   {
 150     i = (i + 1) % MAXSOCKETS;
 151
 152     if (i == firstAvailable)    /* abort! */
 153     {
 154       LeaveCriticalSection(&critical);
 155       return FALSE;
 156     }
 157   }
 158   socketList[i] = socket;
 159   firstAvailable = (i + 1) % MAXSOCKETS;
 160   socket->m_msgnumber = (i + WM_USER);
 161
 162   LeaveCriticalSection(&critical);
 163
 164   return TRUE;
 165 }
 166
 167 void _GSocket_GUI_Destroy(GSocket *socket)
 168 {
 169   /* Remove the socket from the list */
 170   EnterCriticalSection(&critical);
 171   socketList[(socket->m_msgnumber - WM_USER)] = NULL;
 172   LeaveCriticalSection(&critical);
 173 }
 174
 175 /* Windows proc for asynchronous event handling */
 176
 177 LRESULT CALLBACK _GSocket_Internal_WinProc(HWND hWnd,
 178                                            UINT uMsg,
 179                                            WPARAM wParam,
 180                                            LPARAM lParam)
 181 {
 182   GSocket *socket;
 183   GSocketEvent event;
 184   GSocketCallback cback;
 185   char *data;
 186
 187   if (uMsg >= WM_USER && uMsg <= (WM_USER + MAXSOCKETS - 1))
 188   {
 189     EnterCriticalSection(&critical);
 190     socket = socketList[(uMsg - WM_USER)];
 191     event = -1;
 192     cback = NULL;
 193     data = NULL;
 194
 195     /* Check that the socket still exists (it has not been
 196      * destroyed) and for safety, check that the m_fd field
 197      * is what we expect it to be.
 198      */
 199     if ((socket != NULL) && (socket->m_fd == wParam))
 200     {
 201       switch WSAGETSELECTEVENT(lParam)
 202       {
 203         case FD_READ:    event = GSOCK_INPUT; break;
 204         case FD_WRITE:   event = GSOCK_OUTPUT; break;
 205         case FD_ACCEPT:  event = GSOCK_CONNECTION; break;
 206         case FD_CONNECT:
 207         {
 208           if (WSAGETSELECTERROR(lParam) != 0)
 209             event = GSOCK_LOST;
 210           else
 211             event = GSOCK_CONNECTION;
 212           break;
 213         }
 214         case FD_CLOSE:   event = GSOCK_LOST; break;
 215       }
 216
 217       if (event != -1)
 218       {
 219         cback = socket->m_cbacks[event];
 220         data = socket->m_data[event];
 221
 222         if (event == GSOCK_LOST)
 223           socket->m_detected = GSOCK_LOST_FLAG;
 224         else
 225           socket->m_detected |= (1 << event);
 226       }
 227     }
 228
 229     /* OK, we can now leave the critical section because we have
 230      * already obtained the callback address (we make no further
 231      * accesses to socket->whatever). However, the app should
 232      * be prepared to handle events from a socket that has just
 233      * been closed!
 234      */
 235     LeaveCriticalSection(&critical);
 236
 237     if (cback != NULL)
 238       (cback)(socket, event, data);
 239
 240     return (LRESULT) 0;
 241   }
 242   else
 243     return DefWindowProc(hWnd, uMsg, wParam, lParam);
 244 }
 245
 246 /* _GSocket_Enable_Events:
 247  *  Enable all event notifications; we need to be notified of all
 248  *  events for internal processing, but we will only notify users
 249  *  when an appropiate callback function has been installed.
 250  */
 251 void _GSocket_Enable_Events(GSocket *socket)
 252 {
 253   assert (socket != NULL);
 254
 255   if (socket->m_fd != INVALID_SOCKET)
 256   {
 257     /* We could probably just subscribe to all events regardless
 258      * of the socket type, but MS recommends to do it this way.
 259      */
 260     long lEvent = socket->m_server?
 261                   FD_ACCEPT : (FD_READ | FD_WRITE | FD_CONNECT | FD_CLOSE);
 262
 263     WSAAsyncSelect(socket->m_fd, hWin, socket->m_msgnumber, lEvent);
 264   }
 265 }
 266
 267 /* _GSocket_Disable_Events:
 268  *  Disable event notifications (when shutdowning the socket)
 269  */
 270 void _GSocket_Disable_Events(GSocket *socket)
 271 {
 272   assert (socket != NULL);
 273
 274   if (socket->m_fd != INVALID_SOCKET)
 275   {
 276     WSAAsyncSelect(socket->m_fd, hWin, socket->m_msgnumber, 0);
 277   }
 278 }
 279
 280 #else /* !wxUSE_SOCKETS */
 281
 282 /*
 283  * Translation unit shouldn't be empty, so include this typedef to make the
 284  * compiler (VC++ 6.0, for example) happy
 285  */
 286 typedef void (*wxDummy)();
 287
 288 #endif  /* wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__) */