src/common/sckint.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:       socket.cpp
   3 // Purpose:    Socket handler classes
   4 // Authors:    Guilhem Lavaux (completely rewritten from a basic API of Andrew
   5 //             Davidson(1995) in wxWeb)
   6 // Created:    April 1997
   7 // Updated:    April 1999
   8 // Copyright:  (C) 1999, 1998, 1997, Guilhem Lavaux
   9 // RCS_ID:     $Id$
  10 // License:    see wxWindows license
  11 ///////////////////////////////////////////////////////////////////////////////
  12 #ifdef __GNUG__
  13 #pragma implementation "sckint.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_SOCKETS
  24
  25 #define WXSOCK_INTERNAL
  26 #include <wx/object.h>
  27 #include <wx/list.h>
  28 #include <wx/socket.h>
  29 #include <wx/thread.h>
  30 #include <wx/sckint.h>
  31
  32 #ifndef __WXSTUBS__
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <ctype.h>
  37
  38 // -----------------------
  39 // System specific headers
  40 // -----------------------
  41
  42 #ifdef __WXMAC__
  43 // in order to avoid problems with our c library and double definitions
  44 #define close closesocket
  45 #define ioctl ioctlsocket
  46
  47 #include <wx/mac/macsock.h>
  48 #endif
  49
  50 #if defined(__WINDOWS__)
  51 #include <winsock.h>
  52 #endif // __WINDOWS__
  53
  54 #if defined(__UNIX__)
  55
  56 #ifdef VMS
  57 #include <socket.h>
  58 #else
  59 #include <sys/socket.h>
  60 #endif
  61 #include <sys/ioctl.h>
  62
  63 #include <sys/time.h>
  64 #include <unistd.h>
  65
  66 #ifdef sun
  67 #include <sys/filio.h>
  68 #endif
  69
  70 #endif // __UNIX__
  71
  72 #include <signal.h>
  73 #include <errno.h>
  74
  75 #ifdef __VISUALC__
  76 #include <io.h>
  77 #endif
  78
  79 // Constants
  80 #define READ_MASK wxSocketBase::REQ_READ | wxSocketBase::REQ_ACCEPT | wxSocketBase::REQ_LOST
  81 #define WRITE_MASK wxSocketBase::REQ_WRITE | wxSocketBase::REQ_CONNECT
  82
  83 // --------------------------------------------------------------
  84 // --------- SocketWaiter ---------------------------------------
  85 // --------------------------------------------------------------
  86
  87 SocketWaiter::SocketWaiter(wxSocketBase *socket,
  88                                  wxSocketInternal *internal)
  89   : m_socket(socket), m_internal(internal), m_fd(internal->GetFD())
  90 {
  91 }
  92
  93 SocketWaiter::~SocketWaiter()
  94 {
  95 }
  96
  97 void SocketWaiter::ProcessReadEvent()
  98 {
  99   int ret;
 100   char c;
 101
 102   ret = recv(m_fd, &c, 1, MSG_PEEK);
 103
 104   // We are a server => emit a EVT_ACCEPT event.
 105   if (ret == -1 && m_socket->GetType() == wxSocketBase::SOCK_SERVER) {
 106     m_socket->OnRequest(wxSocketBase::EVT_ACCEPT);
 107     return;
 108   }
 109
 110   // Else, no error => there is something to be read else
 111   // we've lost the connection.
 112   if (ret > 0)
 113     m_socket->OnRequest(wxSocketBase::EVT_READ);
 114   else {
 115     m_socket->OnRequest(wxSocketBase::EVT_LOST);
 116     Exit(NULL);
 117   }
 118 }
 119
 120 void SocketWaiter::ProcessWriteEvent()
 121 {
 122   if (m_socket->IsConnected())
 123     m_socket->OnRequest(wxSocketBase::EVT_CONNECT);
 124   else
 125     m_socket->OnRequest(wxSocketBase::EVT_WRITE);
 126 }
 127
 128 void *SocketWaiter::Entry()
 129 {
 130   struct timeval tv;
 131   fd_set sockrd_set, sockwr_set;
 132   wxSocketEvent event;
 133   int ret;
 134
 135   while (1) {
 136     // We won't wait.
 137     tv.tv_sec = 0;
 138     tv.tv_usec = 0;
 139
 140     FD_ZERO(&sockrd_set);
 141     FD_ZERO(&sockwr_set);
 142
 143     if ((m_socket->NeededReq() & READ_MASK) != 0)
 144       FD_SET(m_fd, &sockrd_set);
 145     if ((m_socket->NeededReq() & WRITE_MASK) != 0)
 146       FD_SET(m_fd, &sockwr_set);
 147
 148     m_internal->AcquireFD();
 149     ret = select(FD_SETSIZE, &sockrd_set, &sockwr_set, NULL, &tv);
 150     m_internal->ReleaseFD();
 151
 152     if (FD_ISSET(m_fd, &sockrd_set))
 153       ProcessReadEvent();
 154
 155     if (FD_ISSET(m_fd, &sockwr_set))
 156       ProcessWriteEvent();
 157
 158     if (ret == 0)
 159       // If nothing happened, we wait for 100 ms.
 160       wxThread::Sleep(10);
 161     else
 162       wxThread::Yield();
 163
 164     // Check whether we should exit.
 165     if (TestDestroy())
 166       return NULL;
 167  }
 168   return NULL;
 169 }
 170
 171 // --------------------------------------------------------------
 172 // --------- SocketRequester ------------------------------------
 173 // --------------------------------------------------------------
 174
 175 SocketRequester::SocketRequester(wxSocketBase *socket,
 176                                  wxSocketInternal *internal)
 177   : m_socket(socket), m_internal(internal), m_fd(internal->GetFD())
 178 {
 179 }
 180
 181 SocketRequester::~SocketRequester()
 182 {
 183 }
 184
 185 bool SocketRequester::WaitFor(wxSocketBase::wxRequestNotify req, int millisec)
 186 {
 187   int ret;
 188   struct timeval tv;
 189   fd_set sockrd_set, sockwr_set;
 190
 191   // We won't wait.
 192   tv.tv_sec = millisec / 1000;
 193   tv.tv_usec = (millisec % 1000) * 1000;
 194
 195   if ((req & READ_MASK) != 0)
 196     FD_ZERO(&sockrd_set);
 197   FD_ZERO(&sockwr_set);
 198
 199   FD_SET(m_fd, &sockrd_set);
 200   FD_SET(m_fd, &sockwr_set);
 201
 202   m_internal->AcquireFD();
 203   ret = select(FD_SETSIZE, &sockrd_set, &sockwr_set, NULL, &tv);
 204   m_internal->ReleaseFD();
 205
 206   return (ret != 0);
 207 }
 208
 209 void SocketRequester::ProcessReadEvent(SockRequest *req)
 210 {
 211   int ret;
 212   size_t len;
 213
 214   // We'll wait for the first byte, in case a "timeout event" occurs it returns   // immediately
 215   if (!WaitFor(wxSocketBase::REQ_READ, req->timeout)) {
 216     m_internal->EndRequest(req);
 217     return;
 218   }
 219
 220   m_internal->AcquireFD();
 221   ret = recv(m_fd, req->buffer, req->size,
 222              (req->type == wxSocketBase::REQ_PEEK) ? MSG_PEEK : 0);
 223   m_internal->ReleaseFD();
 224
 225   // An error occured, we exit.
 226   if (ret < 0) {
 227     req->error = errno;
 228     m_internal->EndRequest(req);
 229     return;
 230   }
 231   len = ret;
 232
 233   // If the buffer isn't full (and we want it to be full), we don't unqueue it.
 234   if ((len < req->size) && (m_socket->GetFlags() & wxSocketBase::WAITALL)) {
 235     req->size -= len;
 236     req->io_nbytes += len;
 237     req->buffer += len;
 238     return;
 239   }
 240   // The End.
 241   req->io_nbytes += len;
 242   m_internal->EndRequest(req);
 243 }
 244
 245 void SocketRequester::ProcessWriteEvent(SockRequest *req)
 246 {
 247   int ret;
 248   size_t len;
 249
 250   m_internal->AcquireFD();
 251   ret = send(m_fd, req->buffer, req->size, 0);
 252   m_internal->ReleaseFD();
 253   if (ret < 0) {
 254     req->error = errno;
 255     m_internal->EndRequest(req);
 256     return;
 257   }
 258   len = ret;
 259   if ((len < req->size) && ((m_socket->GetFlags() & wxSocketBase::WAITALL) != 0)) {
 260     req->size -= len;
 261     req->io_nbytes += len;
 262     req->buffer += len;
 263     return;
 264   }
 265   req->io_nbytes += len;
 266   m_internal->EndRequest(req);
 267 }
 268
 269 void SocketRequester::ProcessWaitEvent(SockRequest *req)
 270 {
 271   if (WaitFor(req->type, req->timeout))
 272     req->io_nbytes = 1; // We put 1 in the counter to tell the requester
 273                         // there is no timeout.
 274   else
 275     req->io_nbytes = 0;
 276
 277   m_internal->EndRequest(req);
 278 }
 279
 280 void *SocketRequester::Entry()
 281 {
 282   SockRequest *req;
 283
 284   while (1) {
 285     // Wait for a new request or a destroy message.
 286     req = m_internal->WaitForReq();
 287     if (TestDestroy() || req == NULL)
 288       return NULL;
 289
 290     if ((req->type & wxSocketBase::REQ_WAIT) != 0) {
 291       ProcessWaitEvent(req);
 292       continue;
 293     }
 294
 295     switch (req->type) {
 296     case wxSocketBase::REQ_READ:
 297     case wxSocketBase::REQ_PEEK:
 298       ProcessReadEvent(req);
 299       break;
 300     case wxSocketBase::REQ_WRITE:
 301       ProcessWriteEvent(req);
 302       break;
 303     }
 304   }
 305   return NULL;
 306 }
 307
 308 // --------------------------------------------------------------
 309 // --------- wxSocketInternal -----------------------------------
 310 // --------------------------------------------------------------
 311
 312 wxSocketInternal::wxSocketInternal(wxSocketBase *socket)
 313 {
 314   m_socket = socket;
 315   m_thread_waiter = new SocketWaiter(socket, this);
 316   m_thread_requester = new SocketRequester(socket, this);
 317   m_request_locker.Lock();
 318 }
 319
 320 wxSocketInternal::~wxSocketInternal()
 321 {
 322 //  wxASSERT(!m_finalized); there is no m_finalized anywhere, RR
 323   m_request_locker.Unlock();
 324   delete m_thread_waiter;
 325   delete m_thread_requester;
 326 }
 327
 328 // ----------------------------------------------------------------------
 329 // WaitForReq: it is called by SocketRequester and should return the next
 330 // socket request if available
 331 // ----------------------------------------------------------------------
 332 SockRequest *wxSocketInternal::WaitForReq()
 333 {
 334   wxNode *node;
 335
 336   node = m_requests.First();
 337   if (node == NULL) {
 338     m_socket_cond.Wait(m_request_locker);
 339
 340     node = m_requests.First();
 341     if (node == NULL)
 342       return NULL;
 343   }
 344
 345   return (SockRequest *)node->Data();
 346 }
 347
 348 // ----------------------------------------------------------------------
 349 // EndRequest: Should be called to finalize a request
 350 // ----------------------------------------------------------------------
 351 void wxSocketInternal::EndRequest(SockRequest *req)
 352 {
 353   wxNode *node = NULL;
 354
 355   req->done = TRUE;
 356
 357   node = m_requests.Member((wxObject *)req);
 358   if (node != NULL)
 359     delete node;
 360 }
 361
 362 void wxSocketInternal::AcquireFD()
 363 {
 364   m_fd_locker.Lock();
 365 }
 366
 367 void wxSocketInternal::ReleaseFD()
 368 {
 369   m_fd_locker.Unlock();
 370 }
 371
 372 // ----------------------------------------------------------------------
 373 // InitializeSocket: called by wxSocketBase to initialize the daemons with
 374 // a new file descriptor and to create them
 375 // ----------------------------------------------------------------------
 376 void wxSocketInternal::InitializeSocket()
 377 {
 378 //  wxASSERT( ((m_thread_waiter->IsAlive() && !m_thread_waiter->IsPaused()) ||
 379 //           (m_thread_requester->IsAlive() && !m_thread_requester->IsPaused())));
 380
 381   m_thread_waiter->m_fd = m_socket->m_fd;
 382   m_thread_requester->m_fd = m_socket->m_fd;
 383
 384   if (m_thread_waiter->IsPaused())
 385     ResumeSocket();
 386   else {
 387
 388     if (m_thread_waiter->Create() != wxTHREAD_NO_ERROR) {
 389       // Something should be done here.
 390       return;
 391     }
 392
 393     if (m_thread_requester->Create() != wxTHREAD_NO_ERROR) {
 394       // Something should be done here.
 395       return;
 396     }
 397
 398     m_thread_waiter->Run();
 399     m_thread_requester->Run();
 400   }
 401 }
 402
 403
 404 // ----------------------------------------------------------------------
 405 // InitializeSocket: called by wxSocketBase to destroy daemons
 406 // ----------------------------------------------------------------------
 407 void wxSocketInternal::FinalizeSocket()
 408 {
 409   wxASSERT( (!m_thread_waiter->IsAlive() && !m_thread_requester->IsAlive()) );
 410
 411   ResumeSocket();
 412
 413   m_thread_waiter->Delete();
 414   m_socket_locker.Lock();
 415   if (m_requests.Number() == 0)
 416     m_socket_cond.Signal();
 417   m_socket_locker.Unlock();
 418
 419   m_thread_requester->Delete();
 420 }
 421
 422 void wxSocketInternal::PauseSocket()
 423 {
 424   if (m_thread_waiter != NULL && !m_thread_waiter->IsPaused())
 425     m_thread_waiter->Pause();
 426 }
 427
 428 void wxSocketInternal::ResumeSocket()
 429 {
 430   if (m_thread_waiter != NULL && m_thread_waiter->IsPaused())
 431     m_thread_waiter->Resume();
 432 }
 433
 434 void wxSocketInternal::EnableWaiter()
 435 {
 436   if (m_thread_waiter != NULL && m_thread_waiter->IsPaused())
 437     m_thread_waiter->Resume();
 438 }
 439
 440 void wxSocketInternal::DisableWaiter()
 441 {
 442   if (m_thread_waiter != NULL && !m_thread_waiter->IsPaused())
 443     m_thread_waiter->Pause();
 444 }
 445
 446 // ----------------------------------------------------------------------
 447 // QueueRequest:
 448 // ----------------------------------------------------------------------
 449 void wxSocketInternal::QueueRequest(SockRequest *request, bool async)
 450 {
 451   if (async) {
 452     m_request_locker.Lock();
 453     request->done = FALSE;
 454     m_requests.Append((wxObject *)request);
 455     m_request_locker.Unlock();
 456
 457     // Wake up
 458     m_socket_cond.Signal();
 459
 460     if (request->wait) {
 461       if (wxThread::IsMain())
 462         while (!request->done) {
 463           wxYield();
 464         }
 465       else
 466         while (!request->done) {
 467           wxThread::Yield();
 468         }
 469     }
 470
 471   } else {
 472     m_request_locker.Lock();
 473
 474     if ((request->type & wxSocketBase::REQ_WAIT) != 0) {
 475       m_thread_requester->ProcessWaitEvent(request);
 476     } else {
 477
 478       request->done = FALSE;
 479
 480       switch (request->type) {
 481       case wxSocketBase::REQ_PEEK:
 482       case wxSocketBase::REQ_READ:
 483         m_thread_requester->ProcessReadEvent(request);
 484         break;
 485       case wxSocketBase::REQ_WRITE:
 486         m_thread_requester->ProcessWriteEvent(request);
 487         break;
 488       }
 489     }
 490     request->done = TRUE;
 491     m_request_locker.Unlock();
 492   }
 493 }
 494
 495 void wxSocketInternal::WaitForEnd(SockRequest *request)
 496 {
 497   // TODOTODO
 498 }
 499
 500 #endif
 501   // __WXSTUBS__
 502
 503 #endif
 504   // wxUSE_SOCKETS