Usermode/Applications/axwin3_src/WM/ipc.c

   1 /*
   2  * Acess2 GUI (AxWin) Version 3
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * ipc.c
   6  * - Interprocess communication
   7  */
   8 #include <common.h>
   9 #include <acess/sys.h>
  10 #include <net.h>
  11 #include <string.h>
  12 #include <ipcmessages.h>
  13 #include <stdio.h>
  14 #include <wm.h>
  15 #include <wm_internals.h>
  16
  17 #define AXWIN_PORT      4101
  18
  19 #define STATICBUF_SIZE  64
  20 #define MAX_WINDOWS_PER_APP     128
  21
  22 // === TYPES ===
  23 typedef struct sIPC_Type        tIPC_Type;
  24
  25 struct sIPC_Type
  26 {
  27          int    (*GetIdentSize)(const void *Ident);
  28          int    (*CompareIdent)(const void *Ident1, const void *Ident2);
  29         void    (*SendMessage)(const void *Ident, size_t Length, const void *Data);
  30 };
  31
  32 struct sIPC_Client
  33 {
  34         const tIPC_Type *IPCType;
  35         const void      *Ident; // Stored after structure
  36
  37          int    nWindows;
  38         tWindow **Windows;
  39 };
  40
  41 // === IMPORTS ===
  42 extern tWindow  *gpWM_FocusedWindow;    // Needed for _FocusWindow
  43
  44 // === PROTOTYPES ===
  45 void    IPC_Init(void);
  46 void    IPC_FillSelect(int *nfds, fd_set *set);
  47 void    IPC_HandleSelect(fd_set *set);
  48  int    IPC_Type_Datagram_GetSize(const void *Ident);
  49  int    IPC_Type_Datagram_Compare(const void *Ident1, const void *Ident2);
  50 void    IPC_Type_Datagram_Send(const void *Ident, size_t Length, const void *Data);
  51  int    IPC_Type_Sys_GetSize(const void *Ident);
  52  int    IPC_Type_Sys_Compare(const void *Ident1, const void *Ident2);
  53 void    IPC_Type_Sys_Send(const void *Ident, size_t Length, const void *Data);
  54 void    IPC_Handle(const tIPC_Type *IPCType, const void *Ident, size_t MsgLen, tAxWin_IPCMessage *Msg);
  55
  56 // === GLOBALS ===
  57 const tIPC_Type gIPC_Type_Datagram = {
  58         IPC_Type_Datagram_GetSize,
  59         IPC_Type_Datagram_Compare,
  60         IPC_Type_Datagram_Send
  61 };
  62 const tIPC_Type gIPC_Type_SysMessage = {
  63         IPC_Type_Sys_GetSize,
  64         IPC_Type_Sys_Compare,
  65         IPC_Type_Sys_Send
  66 };
  67  int    giNetworkFileHandle = -1;
  68  int    giMessagesFileHandle = -1;
  69  int    giIPC_ClientCount;
  70 tIPC_Client     **gIPC_Clients;
  71
  72 // === CODE ===
  73 void IPC_Init(void)
  74 {
  75          int    tmp;
  76         // TODO: Check this
  77         giNetworkFileHandle = open("/Devices/ip/loop/udp", OPENFLAG_READ);
  78         tmp = AXWIN_PORT;       ioctl(giNetworkFileHandle, 4, &tmp);    // TODO: Don't hard-code IOCtl number
  79 }
  80
  81 void IPC_FillSelect(int *nfds, fd_set *set)
  82 {
  83         if( giNetworkFileHandle > *nfds )       *nfds = giNetworkFileHandle;
  84         FD_SET(giNetworkFileHandle, set);
  85 }
  86
  87 void IPC_HandleSelect(fd_set *set)
  88 {
  89         if( FD_ISSET(giNetworkFileHandle, set) )
  90         {
  91                 char    staticBuf[STATICBUF_SIZE];
  92                  int    readlen, identlen;
  93                 char    *msg;
  94
  95                 readlen = read(giNetworkFileHandle, staticBuf, sizeof(staticBuf));
  96
  97                 identlen = 4 + Net_GetAddressSize( ((uint16_t*)staticBuf)[1] );
  98                 msg = staticBuf + identlen;
  99
 100                 IPC_Handle(&gIPC_Type_Datagram, staticBuf, readlen - identlen, (void*)msg);
 101 //              _SysDebug("IPC_HandleSelect: UDP handled");
 102         }
 103
 104         while(SysGetMessage(NULL, NULL))
 105         {
 106                 pid_t   tid;
 107                  int    len = SysGetMessage(&tid, NULL);
 108                 char    data[len];
 109                 SysGetMessage(NULL, data);
 110
 111                 IPC_Handle(&gIPC_Type_SysMessage, &tid, len, (void*)data);
 112 //              _SysDebug("IPC_HandleSelect: Message handled");
 113         }
 114 }
 115
 116 int IPC_Type_Datagram_GetSize(const void *Ident)
 117 {
 118         return 4 + Net_GetAddressSize( ((const uint16_t*)Ident)[1] );
 119 }
 120
 121 int IPC_Type_Datagram_Compare(const void *Ident1, const void *Ident2)
 122 {
 123         // Pass the buck :)
 124         // - No need to worry about mis-matching sizes, as the size is computed
 125         //   from the 3rd/4th bytes, hence it will differ before the size is hit.
 126         return memcmp(Ident1, Ident2, IPC_Type_Datagram_GetSize(Ident1));
 127 }
 128
 129 void IPC_Type_Datagram_Send(const void *Ident, size_t Length, const void *Data)
 130 {
 131          int    identlen = IPC_Type_Datagram_GetSize(Ident);
 132         char    tmpbuf[ identlen + Length ];
 133         memcpy(tmpbuf, Ident, identlen);        // Header
 134         memcpy(tmpbuf + identlen, Data, Length);        // Data
 135         // TODO: Handle fragmented packets
 136         write(giNetworkFileHandle, tmpbuf, sizeof(tmpbuf));
 137 }
 138
 139 int IPC_Type_Sys_GetSize(const void *Ident)
 140 {
 141         return sizeof(pid_t);
 142 }
 143
 144 int IPC_Type_Sys_Compare(const void *Ident1, const void *Ident2)
 145 {
 146         return *(const tid_t*)Ident1 - *(const tid_t*)Ident2;
 147 }
 148
 149 void IPC_Type_Sys_Send(const void *Ident, size_t Length, const void *Data)
 150 {
 151         SysSendMessage( *(const tid_t*)Ident, Length, Data );
 152 }
 153
 154 // --- Client -> Window Mappings
 155 int _CompareClientPtrs(const void *_a, const void *_b)
 156 {
 157         tIPC_Client     *a = *(tIPC_Client**)_a;
 158         tIPC_Client     *b = *(tIPC_Client**)_b;
 159
 160         if(a->IPCType < b->IPCType)     return -1;
 161         if(a->IPCType > b->IPCType)     return 1;
 162
 163         return a->IPCType->CompareIdent(a->Ident, b->Ident);
 164 }
 165
 166 tIPC_Client *IPC_int_GetClient(const tIPC_Type *IPCType, const void *Ident)
 167 {
 168          int    pos = 0;        // Position where the new client will be inserted
 169          int    ident_size;
 170         tIPC_Client     *ret;
 171
 172         // - Search list of registered clients
 173         if(giIPC_ClientCount > 0)
 174         {
 175                 tIPC_Client     target;
 176                  int    div;
 177                  int    cmp = -1;
 178
 179                 target.IPCType = IPCType;
 180                 target.Ident = Ident;
 181                 ret = &target;  // Abuse ret to get a pointer
 182
 183                 div = giIPC_ClientCount;
 184                 pos = div/2;
 185                 while(div > 0)
 186                 {
 187                         div /= 2;
 188                         cmp = _CompareClientPtrs(&ret, &gIPC_Clients[pos]);
 189 //                      _SysDebug("Checking against %i gives %i", pos, cmp);
 190                         if(cmp == 0)    break;
 191                         if(cmp < 0)
 192                                 pos -= div;
 193                         else
 194                                 pos += div;
 195                 }
 196
 197                 // - Return if found
 198                 if(cmp == 0)
 199                         return gIPC_Clients[pos];
 200
 201                 // Adjust pos to be the index where the new client will be placed
 202                 if(cmp > 0)     pos ++;
 203         }
 204
 205
 206         // - Create a new client entry
 207         ident_size = IPCType->GetIdentSize(Ident);
 208 //      _SysDebug("ident_size = %i", ident_size);
 209         ret = malloc( sizeof(tIPC_Client) + ident_size );
 210         if(!ret)        return NULL;
 211         ret->IPCType = IPCType;
 212         ret->Ident = ret + 1;   // Get the end of the structure
 213         memcpy( (void*)ret->Ident, Ident, ident_size );
 214         ret->nWindows = 0;
 215         ret->Windows = NULL;
 216
 217         // TODO: Register some way of detecting the client disconnecting
 218         //       > Wait on the thread / register with kernel somehow
 219         //       > Sockets are easier, but UDP is harder. Might get rid of it
 220
 221         // - Insert
 222         giIPC_ClientCount ++;
 223         gIPC_Clients = realloc(gIPC_Clients, giIPC_ClientCount*sizeof(tIPC_Client*));
 224         memmove(&gIPC_Clients[pos+1], &gIPC_Clients[pos], (giIPC_ClientCount-pos-1) * sizeof(tIPC_Client*));
 225         gIPC_Clients[pos] = ret;
 226
 227         return ret;
 228 }
 229
 230 tWindow *IPC_int_GetWindow(tIPC_Client *Client, uint32_t WindowID)
 231 {
 232         if( WindowID == -1 )
 233                 return NULL;
 234
 235         if( WindowID >= Client->nWindows ) {
 236 //              _SysDebug("Window %i out of range for %p (%i)", WindowID, Client, Client->nWindows);
 237                 return NULL;
 238         }
 239
 240         return Client->Windows[WindowID];
 241 }
 242
 243 void IPC_int_SetWindow(tIPC_Client *Client, uint32_t WindowID, tWindow *WindowPtr)
 244 {
 245         if( WindowID >= MAX_WINDOWS_PER_APP )
 246                 return ;
 247
 248         if( WindowID >= Client->nWindows )
 249         {
 250                  int    oldCount = Client->nWindows;
 251                 Client->nWindows = WindowID + 1;
 252                 Client->Windows = realloc(Client->Windows, Client->nWindows*sizeof(tWindow*));
 253                 memset( &Client->Windows[oldCount],  0, (Client->nWindows-oldCount)*sizeof(tWindow*) );
 254                 _SysDebug("Expanded %p's window list from %i to %i", Client, oldCount, Client->nWindows);
 255         }
 256
 257         _SysDebug("Assigned %p to window %i for %p", WindowPtr, WindowID, Client);
 258         Client->Windows[WindowID] = WindowPtr;
 259 }
 260
 261 // --- IPC Message Handlers ---
 262 int IPC_Msg_SendMsg(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 263 {
 264         tIPCMsg_SendMsg *info = (void*)Msg->Data;
 265         tWindow *src, *dest;
 266
 267         // - Sanity checks
 268         if( Msg->Size < sizeof(tIPCMsg_SendMsg) )
 269                 return -1;
 270         if( Msg->Size < sizeof(tIPCMsg_SendMsg) + info->Length )
 271                 return -1;
 272
 273         src = IPC_int_GetWindow(Client, Msg->Window);
 274         if(!src)        return 1;
 275         dest = IPC_int_GetWindow(Client, info->Remote);
 276         if(!dest)       return 1;
 277
 278         WM_SendMessage(src, dest, info->ID, info->Length, info->Data);
 279
 280         return 0;
 281 }
 282
 283 int IPC_Msg_FocusWindow(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 284 {
 285         tWindow *win;
 286
 287         // Don't allow the focus to be changed unless the client has the focus
 288         if(!gpWM_FocusedWindow) return 1;
 289         if(gpWM_FocusedWindow->Client != Client)        return 1;
 290
 291         win = IPC_int_GetWindow(Client, Msg->Window);
 292         if(!win)        return 1;
 293
 294         WM_FocusWindow(win);
 295
 296         return 0;
 297 }
 298
 299 int IPC_Msg_CreateWin(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 300 {
 301         tIPCMsg_CreateWin       *info = (void*)Msg->Data;
 302         tWindow *newwin, *parent;
 303
 304         // - Sanity checks
 305         //  > +1 is for NULL byte on string
 306         if( Msg->Size < sizeof(*info) + 1 ) {
 307                 _SysDebug("IPC_Msg_CreateWin: Size check 1 failed");
 308                 return -1;
 309         }
 310         if( info->Renderer[Msg->Size - sizeof(*info) - 1] != '\0' ) {
 311                 _SysDebug("IPC_Msg_CreateWin: Size check 2 failed");
 312                 _SysDebug("info = {");
 313                 _SysDebug("  .NewWinID = %i", info->NewWinID);
 314                 _SysDebug("  .RendererArg = %i", info->RendererArg);
 315                 _SysDebug("  .Renderer = '%.*s'", Msg->Size - sizeof(*info), info->Renderer);
 316                 _SysDebug("}");
 317                 return -1;
 318         }
 319
 320         // - Get the parent window ID
 321         parent = IPC_int_GetWindow(Client, Msg->Window);
 322
 323         // Catch creating a window with an existing ID
 324         if( IPC_int_GetWindow(Client, info->NewWinID) )
 325                 return 1;
 326
 327         // - Create the new window, and save its pointer
 328         newwin = WM_CreateWindow(parent, Client, info->NewWinID, info->RendererArg, info->Renderer);
 329         IPC_int_SetWindow(Client, info->NewWinID, newwin);
 330
 331         return 0;
 332 }
 333
 334 int IPC_Msg_ShowWindow(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 335 {
 336         tIPCMsg_ShowWindow      *info = (void*)Msg->Data;
 337         tWindow *win;
 338
 339         if( Msg->Size < sizeof(*info) ) return -1;
 340
 341         win = IPC_int_GetWindow(Client, Msg->Window);
 342         if(!win)        return 1;
 343
 344         WM_ShowWindow(win, !!info->bShow);
 345
 346         return 0;
 347 }
 348
 349 int IPC_Msg_SetWinPos(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 350 {
 351         tIPCMsg_SetWindowPos    *info = (void*)Msg->Data;
 352         tWindow *win;
 353
 354         if(Msg->Size < sizeof(*info))   return -1;
 355
 356         win = IPC_int_GetWindow(Client, Msg->Window);
 357         if(!win)        return 1;
 358
 359         _SysDebug("info = {..., bSetPos=%i,bSetDims=%i}", info->bSetPos, info->bSetDims);
 360
 361         if(info->bSetPos)
 362                 WM_MoveWindow(win, info->X, info->Y);
 363         if(info->bSetDims)
 364                 WM_ResizeWindow(win, info->W, info->H);
 365
 366         return 0;
 367 }
 368
 369 int IPC_Msg_GetDisplayCount(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 370 {
 371         tAxWin_IPCMessage       *ret_hdr;
 372         tIPCMsg_ReturnInt       *ret;
 373         char    buf[sizeof(*ret_hdr)+sizeof(*ret)];
 374
 375         if( !(Msg->Flags & IPCMSG_FLAG_RETURN) )        return 0;
 376
 377         ret_hdr = (void*)buf;
 378         ret_hdr->ID = IPCMSG_GETDISPLAYCOUNT;
 379         ret_hdr->Flags = 0;
 380         ret_hdr->Window = -1;
 381         ret_hdr->Size = sizeof(*ret);
 382         ret = (void*)ret_hdr->Data;
 383         ret->Value = 1; // HARD CODE - Current version only supports one display
 384
 385         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 386         return 0;
 387 }
 388
 389 int IPC_Msg_GetDisplayDims(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 390 {
 391         tIPCMsg_GetDisplayDims  *info;
 392         tAxWin_IPCMessage       *ret_hdr;
 393         tIPCMsg_RetDisplayDims  *ret;
 394         char    buf[sizeof(*ret_hdr)+sizeof(*ret)];
 395
 396         if( !(Msg->Flags & IPCMSG_FLAG_RETURN) )        return 0;
 397
 398         info = (void*)Msg->Data;
 399
 400         ret_hdr = (void*)buf;
 401         ret_hdr->ID = IPCMSG_GETDISPLAYDIMS;
 402         ret_hdr->Flags = 0;
 403         ret_hdr->Window = -1;
 404         ret_hdr->Size = sizeof(*ret);
 405         ret = (void*)ret_hdr->Data;
 406
 407         // HARD CODE! Only one display supported
 408         if( info->DisplayID == 0 )
 409         {
 410                 ret->X = 0;
 411                 ret->Y = 0;
 412                 ret->W = giScreenWidth;
 413                 ret->H = giScreenHeight;
 414         }
 415         else
 416         {
 417                 ret->X = 0;     ret->Y = 0;
 418                 ret->W = 0;     ret->H = 0;
 419         }
 420
 421         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 422         return 0;
 423 }
 424
 425 void IPC_Handle(const tIPC_Type *IPCType, const void *Ident, size_t MsgLen, tAxWin_IPCMessage *Msg)
 426 {
 427         tIPC_Client     *client;
 428          int    rv = 0;
 429
 430         _SysDebug("IPC_Handle: (IPCType=%p, Ident=%p, MsgLen=%i, Msg=%p)",
 431                 IPCType, Ident, MsgLen, Msg);
 432
 433         if( MsgLen < sizeof(tAxWin_IPCMessage) )
 434                 return ;
 435         if( MsgLen < sizeof(tAxWin_IPCMessage) + Msg->Size )
 436                 return ;
 437
 438         client = IPC_int_GetClient(IPCType, Ident);
 439
 440         switch((enum eAxWin_IPCMessageTypes) Msg->ID)
 441         {
 442         // --- Ping message (reset timeout and get server version)
 443         case IPCMSG_PING:
 444                 _SysDebug(" IPC_Handle: IPCMSG_PING");
 445                 if( Msg->Size < 4 )     return;
 446                 if( Msg->Flags & IPCMSG_FLAG_RETURN )
 447                 {
 448                         tIPCMsg_ReturnInt       *ret = (void*)Msg->Data;
 449                         Msg->ID = IPCMSG_PING;
 450                         Msg->Size = sizeof(*ret);
 451                         ret->Value = AXWIN_VERSION;
 452                         IPCType->SendMessage(Ident, sizeof(*Msg)+sizeof(*ret), Msg);
 453                 }
 454                 break;
 455
 456         // -- Get display count
 457         case IPCMSG_GETDISPLAYCOUNT:
 458                 rv = IPC_Msg_GetDisplayCount(client, Msg);
 459                 break;
 460
 461         // --- Get display dimensions
 462         case IPCMSG_GETDISPLAYDIMS:
 463                 rv = IPC_Msg_GetDisplayDims(client, Msg);
 464                 break;
 465
 466         // --- Send a message
 467         case IPCMSG_SENDMSG:
 468                 _SysDebug(" IPC_Handle: IPCMSG_SENDMSG %i", ((tIPCMsg_SendMsg*)Msg->Data)->ID);
 469                 rv = IPC_Msg_SendMsg(client, Msg);
 470                 break;
 471
 472         // --- Create window
 473         case IPCMSG_CREATEWIN:
 474                 _SysDebug(" IPC_Handle: IPCMSG_CREATEWIN");
 475                 rv = IPC_Msg_CreateWin(client, Msg);
 476                 break;
 477         // --- Give a window focus
 478         case IPCMSG_FOCUSWINDOW:
 479                 _SysDebug(" IPC_Handle: IPCMSG_FOCUSWINDOW");
 480                 rv = IPC_Msg_FocusWindow(client, Msg);
 481                 break;
 482         // --- Show/Hide a window
 483         case IPCMSG_SHOWWINDOW:
 484                 _SysDebug(" IPC_Handle: IPCMSG_SHOWWINDOW");
 485                 rv = IPC_Msg_ShowWindow(client, Msg);
 486                 break;
 487         // --- Move/Resize a window
 488         case IPCMSG_SETWINPOS:
 489                 _SysDebug(" IPC_Handle: IPCMSG_SETWINPOS");
 490                 rv = IPC_Msg_SetWinPos(client, Msg);
 491                 break;
 492
 493         // --- Unknown message
 494         default:
 495                 fprintf(stderr, "WARNING: Unknown message %i (%p)\n", Msg->ID, IPCType);
 496                 _SysDebug("WARNING: Unknown message %i (%p)", Msg->ID, IPCType);
 497                 break;
 498         }
 499         if(rv)
 500                 _SysDebug("IPC_Handle: rv = %i", rv);
 501 }
 502
 503 // --- Server->Client replies
 504 void IPC_SendWMMessage(tIPC_Client *Client, uint32_t Src, uint32_t Dst, int MsgID, int Len, void *Data)
 505 {
 506         tAxWin_IPCMessage       *hdr;
 507         tIPCMsg_SendMsg         *msg;
 508         char    buf[sizeof(*hdr)+sizeof(*msg)+Len];
 509
 510         hdr = (void*)buf;
 511         msg = (void*)hdr->Data;
 512
 513         hdr->ID = IPCMSG_SENDMSG;
 514         hdr->Flags = 0;
 515         hdr->Size = sizeof(*msg) + Len;
 516         hdr->Window = Dst;
 517
 518         msg->Remote = Src;
 519         msg->ID = MsgID;
 520         msg->Length = Len;
 521         memcpy(msg->Data, Data, Len);
 522
 523         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 524 }
 525