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