src/common/socket.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:       socket.cpp
   3 // Purpose:    Socket handler classes
   4 // Authors:    Guilhem Lavaux, Guillermo Rodriguez Garcia
   5 // Created:    April 1997
   6 // Copyright:  (C) 1999-1997, Guilhem Lavaux
   7 //             (C) 2000-1999, Guillermo Rodriguez Garcia
   8 // RCS_ID:     $Id$
   9 // License:    see wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ==========================================================================
  13 // Declarations
  14 // ==========================================================================
  15
  16 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  17 #pragma implementation "socket.h"
  18 #endif
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_SOCKETS
  28
  29 #include "wx/app.h"
  30 #include "wx/apptrait.h"
  31 #include "wx/defs.h"
  32 #include "wx/object.h"
  33 #include "wx/string.h"
  34 #include "wx/timer.h"
  35 #include "wx/utils.h"
  36 #include "wx/module.h"
  37 #include "wx/log.h"
  38 #include "wx/intl.h"
  39 #include "wx/event.h"
  40
  41 #include "wx/sckaddr.h"
  42 #include "wx/socket.h"
  43
  44 // DLL options compatibility check:
  45 #include "wx/build.h"
  46 WX_CHECK_BUILD_OPTIONS("wxNet")
  47
  48 // --------------------------------------------------------------------------
  49 // macros and constants
  50 // --------------------------------------------------------------------------
  51
  52 // discard buffer
  53 #define MAX_DISCARD_SIZE (10 * 1024)
  54
  55 // what to do within waits: we have 2 cases: from the main thread itself we
  56 // have to call wxYield() to let the events (including the GUI events and the
  57 // low-level (not wxWindows) events from GSocket) be processed. From another
  58 // thread it is enough to just call wxThread::Yield() which will give away the
  59 // rest of our time slice: the explanation is that the events will be processed
  60 // by the main thread anyhow, without calling wxYield(), but we don't want to
  61 // eat the CPU time uselessly while sitting in the loop waiting for the data
  62 #if wxUSE_THREADS
  63     #define PROCESS_EVENTS()        \
  64     {                               \
  65         if ( wxThread::IsMain() )   \
  66             wxYield();              \
  67         else                        \
  68             wxThread::Yield();      \
  69     }
  70 #else // !wxUSE_THREADS
  71     #define PROCESS_EVENTS() wxYield()
  72 #endif // wxUSE_THREADS/!wxUSE_THREADS
  73
  74 #define wxTRACE_Socket _T("wxSocket")
  75
  76 // --------------------------------------------------------------------------
  77 // wxWin macros
  78 // --------------------------------------------------------------------------
  79
  80 IMPLEMENT_CLASS(wxSocketBase, wxObject)
  81 IMPLEMENT_CLASS(wxSocketServer, wxSocketBase)
  82 IMPLEMENT_CLASS(wxSocketClient, wxSocketBase)
  83 IMPLEMENT_CLASS(wxDatagramSocket, wxSocketBase)
  84 IMPLEMENT_DYNAMIC_CLASS(wxSocketEvent, wxEvent)
  85
  86 // --------------------------------------------------------------------------
  87 // private classes
  88 // --------------------------------------------------------------------------
  89
  90 class wxSocketState : public wxObject
  91 {
  92 public:
  93   wxSocketFlags            m_flags;
  94   wxSocketEventFlags       m_eventmask;
  95   bool                     m_notify;
  96   void                    *m_clientData;
  97
  98 public:
  99   wxSocketState() : wxObject() {}
 100
 101     DECLARE_NO_COPY_CLASS(wxSocketState)
 102 };
 103
 104 // ==========================================================================
 105 // wxSocketBase
 106 // ==========================================================================
 107
 108 // --------------------------------------------------------------------------
 109 // Initialization and shutdown
 110 // --------------------------------------------------------------------------
 111
 112 // FIXME-MT: all this is MT-unsafe, of course, we should protect all accesses
 113 //           to m_countInit with a crit section
 114 size_t wxSocketBase::m_countInit = 0;
 115
 116 bool wxSocketBase::IsInitialized()
 117 {
 118     return m_countInit > 0;
 119 }
 120
 121 bool wxSocketBase::Initialize()
 122 {
 123     if ( !m_countInit++ )
 124     {
 125         wxAppTraits *traits = wxAppConsole::GetInstance() ?
 126                               wxAppConsole::GetInstance()->GetTraits() : NULL;
 127         GSocketGUIFunctionsTable *functions =
 128             traits ? traits->GetSocketGUIFunctionsTable() : NULL;
 129         GSocket_SetGUIFunctions(functions);
 130
 131         if ( !GSocket_Init() )
 132         {
 133             m_countInit--;
 134
 135             return FALSE;
 136         }
 137     }
 138
 139     return TRUE;
 140 }
 141
 142 void wxSocketBase::Shutdown()
 143 {
 144     // we should be initialized
 145     wxASSERT_MSG( m_countInit, _T("extra call to Shutdown()") );
 146     if ( !--m_countInit )
 147     {
 148         GSocket_Cleanup();
 149     }
 150 }
 151
 152 // --------------------------------------------------------------------------
 153 // Ctor and dtor
 154 // --------------------------------------------------------------------------
 155
 156 void wxSocketBase::Init()
 157 {
 158   m_socket       = NULL;
 159   m_type         = wxSOCKET_UNINIT;
 160
 161   // state
 162   m_flags        = 0;
 163   m_connected    =
 164   m_establishing =
 165   m_reading      =
 166   m_writing      =
 167   m_error        = FALSE;
 168   m_lcount       = 0;
 169   m_timeout      = 600;
 170   m_beingDeleted = FALSE;
 171
 172   // pushback buffer
 173   m_unread       = NULL;
 174   m_unrd_size    = 0;
 175   m_unrd_cur     = 0;
 176
 177   // events
 178   m_id           = -1;
 179   m_handler      = NULL;
 180   m_clientData   = NULL;
 181   m_notify       = FALSE;
 182   m_eventmask    = 0;
 183
 184   if ( !IsInitialized() )
 185   {
 186       // this Initialize() will be undone by wxSocketModule::OnExit(), all the
 187       // other calls to it should be matched by a call to Shutdown()
 188       Initialize();
 189   }
 190 }
 191
 192 wxSocketBase::wxSocketBase()
 193 {
 194   Init();
 195 }
 196
 197 wxSocketBase::wxSocketBase(wxSocketFlags flags, wxSocketType type)
 198 {
 199   Init();
 200
 201   m_flags = flags;
 202   m_type  = type;
 203 }
 204
 205 wxSocketBase::~wxSocketBase()
 206 {
 207   // Just in case the app called Destroy() *and* then deleted
 208   // the socket immediately: don't leave dangling pointers.
 209   wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 210   if ( traits )
 211       traits->RemoveFromPendingDelete(this);
 212
 213   // Shutdown and close the socket
 214   if (!m_beingDeleted)
 215     Close();
 216
 217   // Destroy the GSocket object
 218   if (m_socket)
 219     GSocket_destroy(m_socket);
 220
 221   // Free the pushback buffer
 222   if (m_unread)
 223     free(m_unread);
 224 }
 225
 226 bool wxSocketBase::Destroy()
 227 {
 228   // Delayed destruction: the socket will be deleted during the next
 229   // idle loop iteration. This ensures that all pending events have
 230   // been processed.
 231   m_beingDeleted = TRUE;
 232
 233   // Shutdown and close the socket
 234   Close();
 235
 236   // Supress events from now on
 237   Notify(FALSE);
 238
 239   // schedule this object for deletion
 240   wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 241   if ( traits )
 242   {
 243       // let the traits object decide what to do with us
 244       traits->ScheduleForDestroy(this);
 245   }
 246   else // no app or no traits
 247   {
 248       // in wxBase we might have no app object at all, don't leak memory
 249       delete this;
 250   }
 251
 252   return TRUE;
 253 }
 254
 255 // --------------------------------------------------------------------------
 256 // Basic IO calls
 257 // --------------------------------------------------------------------------
 258
 259 // The following IO operations update m_error and m_lcount:
 260 // {Read, Write, ReadMsg, WriteMsg, Peek, Unread, Discard}
 261 //
 262 // TODO: Should Connect, Accept and AcceptWith update m_error?
 263
 264 bool wxSocketBase::Close()
 265 {
 266   // Interrupt pending waits
 267   InterruptWait();
 268
 269   if (m_socket)
 270   {
 271     // Disable callbacks
 272     GSocket_UnsetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
 273                                     GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG);
 274
 275     // Shutdown the connection
 276     GSocket_Shutdown(m_socket);
 277   }
 278
 279   m_connected = FALSE;
 280   m_establishing = FALSE;
 281   return TRUE;
 282 }
 283
 284 wxSocketBase& wxSocketBase::Read(void* buffer, wxUint32 nbytes)
 285 {
 286   // Mask read events
 287   m_reading = TRUE;
 288
 289   m_lcount = _Read(buffer, nbytes);
 290
 291   // If in wxSOCKET_WAITALL mode, all bytes should have been read.
 292   if (m_flags & wxSOCKET_WAITALL)
 293     m_error = (m_lcount != nbytes);
 294   else
 295     m_error = (m_lcount == 0);
 296
 297   // Allow read events from now on
 298   m_reading = FALSE;
 299
 300   return *this;
 301 }
 302
 303 wxUint32 wxSocketBase::_Read(void* buffer, wxUint32 nbytes)
 304 {
 305   int total;
 306
 307   // Try the pushback buffer first
 308   total = GetPushback(buffer, nbytes, FALSE);
 309   nbytes -= total;
 310   buffer  = (char *)buffer + total;
 311
 312   // Return now in one of the following cases:
 313   // - the socket is invalid,
 314   // - we got all the data,
 315   // - we got *some* data and we are not using wxSOCKET_WAITALL.
 316   if ( !m_socket ||
 317        !nbytes ||
 318        ((total != 0) && !(m_flags & wxSOCKET_WAITALL)) )
 319     return total;
 320
 321   // Possible combinations (they are checked in this order)
 322   // wxSOCKET_NOWAIT
 323   // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
 324   // wxSOCKET_BLOCK
 325   // wxSOCKET_NONE
 326   //
 327   int ret;
 328   if (m_flags & wxSOCKET_NOWAIT)
 329   {
 330     GSocket_SetNonBlocking(m_socket, 1);
 331     ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 332     GSocket_SetNonBlocking(m_socket, 0);
 333
 334     if (ret > 0)
 335       total += ret;
 336   }
 337   else
 338   {
 339     bool more = TRUE;
 340
 341     while (more)
 342     {
 343       if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForRead() )
 344         break;
 345
 346       ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 347
 348       if (ret > 0)
 349       {
 350         total  += ret;
 351         nbytes -= ret;
 352         buffer  = (char *)buffer + ret;
 353       }
 354
 355       // If we got here and wxSOCKET_WAITALL is not set, we can leave
 356       // now. Otherwise, wait until we recv all the data or until there
 357       // is an error.
 358       //
 359       more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
 360     }
 361   }
 362
 363   return total;
 364 }
 365
 366 wxSocketBase& wxSocketBase::ReadMsg(void* buffer, wxUint32 nbytes)
 367 {
 368   wxUint32 len, len2, sig, total;
 369   bool error;
 370   int old_flags;
 371   struct
 372   {
 373     unsigned char sig[4];
 374     unsigned char len[4];
 375   } msg;
 376
 377   // Mask read events
 378   m_reading = TRUE;
 379
 380   total = 0;
 381   error = TRUE;
 382   old_flags = m_flags;
 383   SetFlags((m_flags & wxSOCKET_BLOCK) | wxSOCKET_WAITALL);
 384
 385   if (_Read(&msg, sizeof(msg)) != sizeof(msg))
 386     goto exit;
 387
 388   sig = (wxUint32)msg.sig[0];
 389   sig |= (wxUint32)(msg.sig[1] << 8);
 390   sig |= (wxUint32)(msg.sig[2] << 16);
 391   sig |= (wxUint32)(msg.sig[3] << 24);
 392
 393   if (sig != 0xfeeddead)
 394   {
 395     wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
 396     goto exit;
 397   }
 398
 399   len = (wxUint32)msg.len[0];
 400   len |= (wxUint32)(msg.len[1] << 8);
 401   len |= (wxUint32)(msg.len[2] << 16);
 402   len |= (wxUint32)(msg.len[3] << 24);
 403
 404   if (len > nbytes)
 405   {
 406     len2 = len - nbytes;
 407     len = nbytes;
 408   }
 409   else
 410     len2 = 0;
 411
 412   // Don't attemp to read if the msg was zero bytes long.
 413   if (len)
 414   {
 415     total = _Read(buffer, len);
 416
 417     if (total != len)
 418       goto exit;
 419   }
 420   if (len2)
 421   {
 422     char *discard_buffer = new char[MAX_DISCARD_SIZE];
 423     long discard_len;
 424
 425     // NOTE: discarded bytes don't add to m_lcount.
 426     do
 427     {
 428       discard_len = ((len2 > MAX_DISCARD_SIZE)? MAX_DISCARD_SIZE : len2);
 429       discard_len = _Read(discard_buffer, (wxUint32)discard_len);
 430       len2 -= (wxUint32)discard_len;
 431     }
 432     while ((discard_len > 0) && len2);
 433
 434     delete [] discard_buffer;
 435
 436     if (len2 != 0)
 437       goto exit;
 438   }
 439   if (_Read(&msg, sizeof(msg)) != sizeof(msg))
 440     goto exit;
 441
 442   sig = (wxUint32)msg.sig[0];
 443   sig |= (wxUint32)(msg.sig[1] << 8);
 444   sig |= (wxUint32)(msg.sig[2] << 16);
 445   sig |= (wxUint32)(msg.sig[3] << 24);
 446
 447   if (sig != 0xdeadfeed)
 448   {
 449     wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
 450     goto exit;
 451   }
 452
 453   // everything was OK
 454   error = FALSE;
 455
 456 exit:
 457   m_error = error;
 458   m_lcount = total;
 459   m_reading = FALSE;
 460   SetFlags(old_flags);
 461
 462   return *this;
 463 }
 464
 465 wxSocketBase& wxSocketBase::Peek(void* buffer, wxUint32 nbytes)
 466 {
 467   // Mask read events
 468   m_reading = TRUE;
 469
 470   m_lcount = _Read(buffer, nbytes);
 471   Pushback(buffer, m_lcount);
 472
 473   // If in wxSOCKET_WAITALL mode, all bytes should have been read.
 474   if (m_flags & wxSOCKET_WAITALL)
 475     m_error = (m_lcount != nbytes);
 476   else
 477     m_error = (m_lcount == 0);
 478
 479   // Allow read events again
 480   m_reading = FALSE;
 481
 482   return *this;
 483 }
 484
 485 wxSocketBase& wxSocketBase::Write(const void *buffer, wxUint32 nbytes)
 486 {
 487   // Mask write events
 488   m_writing = TRUE;
 489
 490   m_lcount = _Write(buffer, nbytes);
 491
 492   // If in wxSOCKET_WAITALL mode, all bytes should have been written.
 493   if (m_flags & wxSOCKET_WAITALL)
 494     m_error = (m_lcount != nbytes);
 495   else
 496     m_error = (m_lcount == 0);
 497
 498   // Allow write events again
 499   m_writing = FALSE;
 500
 501   return *this;
 502 }
 503
 504 wxUint32 wxSocketBase::_Write(const void *buffer, wxUint32 nbytes)
 505 {
 506   wxUint32 total = 0;
 507
 508   // If the socket is invalid or parameters are ill, return immediately
 509   if (!m_socket || !buffer || !nbytes)
 510     return 0;
 511
 512   // Possible combinations (they are checked in this order)
 513   // wxSOCKET_NOWAIT
 514   // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
 515   // wxSOCKET_BLOCK
 516   // wxSOCKET_NONE
 517   //
 518   int ret;
 519   if (m_flags & wxSOCKET_NOWAIT)
 520   {
 521     GSocket_SetNonBlocking(m_socket, 1);
 522     ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 523     GSocket_SetNonBlocking(m_socket, 0);
 524
 525     if (ret > 0)
 526       total = ret;
 527   }
 528   else
 529   {
 530     bool more = TRUE;
 531
 532     while (more)
 533     {
 534       if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForWrite() )
 535         break;
 536
 537       ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 538
 539       if (ret > 0)
 540       {
 541         total  += ret;
 542         nbytes -= ret;
 543         buffer  = (const char *)buffer + ret;
 544       }
 545
 546       // If we got here and wxSOCKET_WAITALL is not set, we can leave
 547       // now. Otherwise, wait until we send all the data or until there
 548       // is an error.
 549       //
 550       more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
 551     }
 552   }
 553
 554   return total;
 555 }
 556
 557 wxSocketBase& wxSocketBase::WriteMsg(const void *buffer, wxUint32 nbytes)
 558 {
 559   wxUint32 total;
 560   bool error;
 561   struct
 562   {
 563     unsigned char sig[4];
 564     unsigned char len[4];
 565   } msg;
 566
 567   // Mask write events
 568   m_writing = TRUE;
 569
 570   error = TRUE;
 571   total = 0;
 572   SetFlags((m_flags & wxSOCKET_BLOCK) | wxSOCKET_WAITALL);
 573
 574   msg.sig[0] = (unsigned char) 0xad;
 575   msg.sig[1] = (unsigned char) 0xde;
 576   msg.sig[2] = (unsigned char) 0xed;
 577   msg.sig[3] = (unsigned char) 0xfe;
 578
 579   msg.len[0] = (unsigned char) (nbytes & 0xff);
 580   msg.len[1] = (unsigned char) ((nbytes >> 8) & 0xff);
 581   msg.len[2] = (unsigned char) ((nbytes >> 16) & 0xff);
 582   msg.len[3] = (unsigned char) ((nbytes >> 24) & 0xff);
 583
 584   if (_Write(&msg, sizeof(msg)) < sizeof(msg))
 585     goto exit;
 586
 587   total = _Write(buffer, nbytes);
 588
 589   if (total < nbytes)
 590     goto exit;
 591
 592   msg.sig[0] = (unsigned char) 0xed;
 593   msg.sig[1] = (unsigned char) 0xfe;
 594   msg.sig[2] = (unsigned char) 0xad;
 595   msg.sig[3] = (unsigned char) 0xde;
 596   msg.len[0] = msg.len[1] = msg.len[2] = msg.len[3] = (char) 0;
 597
 598   if ((_Write(&msg, sizeof(msg))) < sizeof(msg))
 599     goto exit;
 600
 601   // everything was OK
 602   error = FALSE;
 603
 604 exit:
 605   m_error = error;
 606   m_lcount = total;
 607   m_writing = FALSE;
 608
 609   return *this;
 610 }
 611
 612 wxSocketBase& wxSocketBase::Unread(const void *buffer, wxUint32 nbytes)
 613 {
 614   if (nbytes != 0)
 615     Pushback(buffer, nbytes);
 616
 617   m_error = FALSE;
 618   m_lcount = nbytes;
 619
 620   return *this;
 621 }
 622
 623 wxSocketBase& wxSocketBase::Discard()
 624 {
 625   char *buffer = new char[MAX_DISCARD_SIZE];
 626   wxUint32 ret;
 627   wxUint32 total = 0;
 628
 629   // Mask read events
 630   m_reading = TRUE;
 631
 632   SetFlags(wxSOCKET_NOWAIT);
 633
 634   do
 635   {
 636     ret = _Read(buffer, MAX_DISCARD_SIZE);
 637     total += ret;
 638   }
 639   while (ret == MAX_DISCARD_SIZE);
 640
 641   delete[] buffer;
 642   m_lcount = total;
 643   m_error  = FALSE;
 644
 645   // Allow read events again
 646   m_reading = FALSE;
 647
 648   return *this;
 649 }
 650
 651 // --------------------------------------------------------------------------
 652 // Wait functions
 653 // --------------------------------------------------------------------------
 654
 655 // All Wait functions poll the socket using GSocket_Select() to
 656 // check for the specified combination of conditions, until one
 657 // of these conditions become true, an error occurs, or the
 658 // timeout elapses. The polling loop calls PROCESS_EVENTS(), so
 659 // this won't block the GUI.
 660
 661 bool wxSocketBase::_Wait(long seconds,
 662                          long milliseconds,
 663                          wxSocketEventFlags flags)
 664 {
 665   GSocketEventFlags result;
 666   long timeout;
 667
 668   // Set this to TRUE to interrupt ongoing waits
 669   m_interrupt = FALSE;
 670
 671   // Check for valid socket
 672   if (!m_socket)
 673     return FALSE;
 674
 675   // Check for valid timeout value.
 676   if (seconds != -1)
 677     timeout = seconds * 1000 + milliseconds;
 678   else
 679     timeout = m_timeout * 1000;
 680
 681 #if !defined(wxUSE_GUI) || !wxUSE_GUI
 682   GSocket_SetTimeout(m_socket, timeout);
 683 #endif
 684
 685   // Wait in an active polling loop.
 686   //
 687   // NOTE: We duplicate some of the code in OnRequest, but this doesn't
 688   //   hurt. It has to be here because the (GSocket) event might arrive
 689   //   a bit delayed, and it has to be in OnRequest as well because we
 690   //   don't know whether the Wait functions are being used.
 691   //
 692   // Do this at least once (important if timeout == 0, when
 693   // we are just polling). Also, if just polling, do not yield.
 694
 695   wxStopWatch chrono;
 696   bool done = FALSE;
 697
 698   while (!done)
 699   {
 700     result = GSocket_Select(m_socket, flags | GSOCK_LOST_FLAG);
 701
 702     // Incoming connection (server) or connection established (client)
 703     if (result & GSOCK_CONNECTION_FLAG)
 704     {
 705       m_connected = TRUE;
 706       m_establishing = FALSE;
 707       return TRUE;
 708     }
 709
 710     // Data available or output buffer ready
 711     if ((result & GSOCK_INPUT_FLAG) || (result & GSOCK_OUTPUT_FLAG))
 712     {
 713       return TRUE;
 714     }
 715
 716     // Connection lost
 717     if (result & GSOCK_LOST_FLAG)
 718     {
 719       m_connected = FALSE;
 720       m_establishing = FALSE;
 721       return (flags & GSOCK_LOST_FLAG) != 0;
 722     }
 723
 724     // Wait more?
 725     if ((!timeout) || (chrono.Time() > timeout) || (m_interrupt))
 726       done = TRUE;
 727     else
 728       PROCESS_EVENTS();
 729   }
 730
 731   return FALSE;
 732 }
 733
 734 bool wxSocketBase::Wait(long seconds, long milliseconds)
 735 {
 736   return _Wait(seconds, milliseconds, GSOCK_INPUT_FLAG |
 737                                       GSOCK_OUTPUT_FLAG |
 738                                       GSOCK_CONNECTION_FLAG |
 739                                       GSOCK_LOST_FLAG);
 740 }
 741
 742 bool wxSocketBase::WaitForRead(long seconds, long milliseconds)
 743 {
 744   // Check pushback buffer before entering _Wait
 745   if (m_unread)
 746     return TRUE;
 747
 748   // Note that GSOCK_INPUT_LOST has to be explicitly passed to
 749   // _Wait becuase of the semantics of WaitForRead: a return
 750   // value of TRUE means that a GSocket_Read call will return
 751   // immediately, not that there is actually data to read.
 752
 753   return _Wait(seconds, milliseconds, GSOCK_INPUT_FLAG |
 754                                       GSOCK_LOST_FLAG);
 755 }
 756
 757 bool wxSocketBase::WaitForWrite(long seconds, long milliseconds)
 758 {
 759   return _Wait(seconds, milliseconds, GSOCK_OUTPUT_FLAG);
 760 }
 761
 762 bool wxSocketBase::WaitForLost(long seconds, long milliseconds)
 763 {
 764   return _Wait(seconds, milliseconds, GSOCK_LOST_FLAG);
 765 }
 766
 767 // --------------------------------------------------------------------------
 768 // Miscellaneous
 769 // --------------------------------------------------------------------------
 770
 771 //
 772 // Get local or peer address
 773 //
 774
 775 bool wxSocketBase::GetPeer(wxSockAddress& addr_man) const
 776 {
 777   GAddress *peer;
 778
 779   if (!m_socket)
 780     return FALSE;
 781
 782   peer = GSocket_GetPeer(m_socket);
 783
 784     // copying a null address would just trigger an assert anyway
 785
 786   if (!peer)
 787     return FALSE;
 788
 789   addr_man.SetAddress(peer);
 790   GAddress_destroy(peer);
 791
 792   return TRUE;
 793 }
 794
 795 bool wxSocketBase::GetLocal(wxSockAddress& addr_man) const
 796 {
 797   GAddress *local;
 798
 799   if (!m_socket)
 800     return FALSE;
 801
 802   local = GSocket_GetLocal(m_socket);
 803   addr_man.SetAddress(local);
 804   GAddress_destroy(local);
 805
 806   return TRUE;
 807 }
 808
 809 //
 810 // Save and restore socket state
 811 //
 812
 813 void wxSocketBase::SaveState()
 814 {
 815   wxSocketState *state;
 816
 817   state = new wxSocketState();
 818
 819   state->m_flags      = m_flags;
 820   state->m_notify     = m_notify;
 821   state->m_eventmask  = m_eventmask;
 822   state->m_clientData = m_clientData;
 823
 824   m_states.Append(state);
 825 }
 826
 827 void wxSocketBase::RestoreState()
 828 {
 829   wxList::compatibility_iterator node;
 830   wxSocketState *state;
 831
 832   node = m_states.GetLast();
 833   if (!node)
 834     return;
 835
 836   state = (wxSocketState *)node->GetData();
 837
 838   m_flags      = state->m_flags;
 839   m_notify     = state->m_notify;
 840   m_eventmask  = state->m_eventmask;
 841   m_clientData = state->m_clientData;
 842
 843   m_states.Erase(node);
 844   delete state;
 845 }
 846
 847 //
 848 // Timeout and flags
 849 //
 850
 851 void wxSocketBase::SetTimeout(long seconds)
 852 {
 853   m_timeout = seconds;
 854
 855   if (m_socket)
 856     GSocket_SetTimeout(m_socket, m_timeout * 1000);
 857 }
 858
 859 void wxSocketBase::SetFlags(wxSocketFlags flags)
 860 {
 861   m_flags = flags;
 862 }
 863
 864
 865 // --------------------------------------------------------------------------
 866 // Event handling
 867 // --------------------------------------------------------------------------
 868
 869 // A note on how events are processed, which is probably the most
 870 // difficult thing to get working right while keeping the same API
 871 // and functionality for all platforms.
 872 //
 873 // When GSocket detects an event, it calls wx_socket_callback, which in
 874 // turn just calls wxSocketBase::OnRequest in the corresponding wxSocket
 875 // object. OnRequest does some housekeeping, and if the event is to be
 876 // propagated to the user, it creates a new wxSocketEvent object and
 877 // posts it. The event is not processed immediately, but delayed with
 878 // AddPendingEvent instead. This is necessary in order to decouple the
 879 // event processing from wx_socket_callback; otherwise, subsequent IO
 880 // calls made from the user event handler would fail, as gtk callbacks
 881 // are not reentrant.
 882 //
 883 // Note that, unlike events, user callbacks (now deprecated) are _not_
 884 // decoupled from wx_socket_callback and thus they suffer from a variety
 885 // of problems. Avoid them where possible and use events instead.
 886
 887 extern "C"
 888 void LINKAGEMODE wx_socket_callback(GSocket * WXUNUSED(socket),
 889                                     GSocketEvent notification,
 890                                     char *cdata)
 891 {
 892   wxSocketBase *sckobj = (wxSocketBase *)cdata;
 893
 894   sckobj->OnRequest((wxSocketNotify) notification);
 895 }
 896
 897 void wxSocketBase::OnRequest(wxSocketNotify notification)
 898 {
 899   // NOTE: We duplicate some of the code in _Wait, but this doesn't
 900   //   hurt. It has to be here because the (GSocket) event might arrive
 901   //   a bit delayed, and it has to be in _Wait as well because we don't
 902   //   know whether the Wait functions are being used.
 903
 904   switch(notification)
 905   {
 906     case wxSOCKET_CONNECTION:
 907       m_establishing = FALSE;
 908       m_connected = TRUE;
 909       break;
 910
 911     // If we are in the middle of a R/W operation, do not
 912     // propagate events to users. Also, filter 'late' events
 913     // which are no longer valid.
 914
 915     case wxSOCKET_INPUT:
 916       if (m_reading || !GSocket_Select(m_socket, GSOCK_INPUT_FLAG))
 917         return;
 918       break;
 919
 920     case wxSOCKET_OUTPUT:
 921       if (m_writing || !GSocket_Select(m_socket, GSOCK_OUTPUT_FLAG))
 922         return;
 923       break;
 924
 925     case wxSOCKET_LOST:
 926       m_connected = FALSE;
 927       m_establishing = FALSE;
 928       break;
 929
 930     default:
 931       break;
 932   }
 933
 934   // Schedule the event
 935
 936   wxSocketEventFlags flag = 0;
 937   wxUnusedVar(flag);
 938   switch (notification)
 939   {
 940     case GSOCK_INPUT:      flag = GSOCK_INPUT_FLAG; break;
 941     case GSOCK_OUTPUT:     flag = GSOCK_OUTPUT_FLAG; break;
 942     case GSOCK_CONNECTION: flag = GSOCK_CONNECTION_FLAG; break;
 943     case GSOCK_LOST:       flag = GSOCK_LOST_FLAG; break;
 944     default:
 945       wxLogWarning(_("wxSocket: unknown event!."));
 946       return;
 947   }
 948
 949   if (((m_eventmask & flag) == flag) && m_notify)
 950   {
 951     if (m_handler)
 952     {
 953       wxSocketEvent event(m_id);
 954       event.m_event      = notification;
 955       event.m_clientData = m_clientData;
 956       event.SetEventObject(this);
 957
 958       m_handler->AddPendingEvent(event);
 959     }
 960   }
 961 }
 962
 963 void wxSocketBase::Notify(bool notify)
 964 {
 965   m_notify = notify;
 966 }
 967
 968 void wxSocketBase::SetNotify(wxSocketEventFlags flags)
 969 {
 970   m_eventmask = flags;
 971 }
 972
 973 void wxSocketBase::SetEventHandler(wxEvtHandler& handler, int id)
 974 {
 975   m_handler = &handler;
 976   m_id      = id;
 977 }
 978
 979 // --------------------------------------------------------------------------
 980 // Pushback buffer
 981 // --------------------------------------------------------------------------
 982
 983 void wxSocketBase::Pushback(const void *buffer, wxUint32 size)
 984 {
 985   if (!size) return;
 986
 987   if (m_unread == NULL)
 988     m_unread = malloc(size);
 989   else
 990   {
 991     void *tmp;
 992
 993     tmp = malloc(m_unrd_size + size);
 994     memcpy((char *)tmp + size, m_unread, m_unrd_size);
 995     free(m_unread);
 996
 997     m_unread = tmp;
 998   }
 999
1000   m_unrd_size += size;
1001
1002   memcpy(m_unread, buffer, size);
1003 }
1004
1005 wxUint32 wxSocketBase::GetPushback(void *buffer, wxUint32 size, bool peek)
1006 {
1007   if (!m_unrd_size)
1008     return 0;
1009
1010   if (size > (m_unrd_size-m_unrd_cur))
1011     size = m_unrd_size-m_unrd_cur;
1012
1013   memcpy(buffer, (char *)m_unread + m_unrd_cur, size);
1014
1015   if (!peek)
1016   {
1017     m_unrd_cur += size;
1018     if (m_unrd_size == m_unrd_cur)
1019     {
1020       free(m_unread);
1021       m_unread = NULL;
1022       m_unrd_size = 0;
1023       m_unrd_cur  = 0;
1024     }
1025   }
1026
1027   return size;
1028 }
1029
1030
1031 // ==========================================================================
1032 // wxSocketServer
1033 // ==========================================================================
1034
1035 // --------------------------------------------------------------------------
1036 // Ctor
1037 // --------------------------------------------------------------------------
1038
1039 wxSocketServer::wxSocketServer(wxSockAddress& addr_man,
1040                                wxSocketFlags flags)
1041               : wxSocketBase(flags, wxSOCKET_SERVER)
1042 {
1043     wxLogTrace( wxTRACE_Socket, _T("Opening wxSocketServer") );
1044
1045     m_socket = GSocket_new();
1046
1047     if (!m_socket)
1048     {
1049         wxLogTrace( wxTRACE_Socket, _T("*** GSocket_new failed") );
1050         return;
1051     }
1052
1053         // Setup the socket as server
1054
1055     GSocket_SetLocal(m_socket, addr_man.GetAddress());
1056     if (GSocket_SetServer(m_socket) != GSOCK_NOERROR)
1057     {
1058         GSocket_destroy(m_socket);
1059         m_socket = NULL;
1060
1061         wxLogTrace( wxTRACE_Socket, _T("*** GSocket_SetServer failed") );
1062         return;
1063     }
1064
1065     GSocket_SetTimeout(m_socket, m_timeout * 1000);
1066     GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1067                                   GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1068                                   wx_socket_callback, (char *)this);
1069 }
1070
1071 // --------------------------------------------------------------------------
1072 // Accept
1073 // --------------------------------------------------------------------------
1074
1075 bool wxSocketServer::AcceptWith(wxSocketBase& sock, bool wait)
1076 {
1077   GSocket *child_socket;
1078
1079   if (!m_socket)
1080     return FALSE;
1081
1082   // If wait == FALSE, then the call should be nonblocking.
1083   // When we are finished, we put the socket to blocking mode
1084   // again.
1085
1086   if (!wait)
1087     GSocket_SetNonBlocking(m_socket, 1);
1088
1089   child_socket = GSocket_WaitConnection(m_socket);
1090
1091   if (!wait)
1092     GSocket_SetNonBlocking(m_socket, 0);
1093
1094   if (!child_socket)
1095     return FALSE;
1096
1097   sock.m_type = wxSOCKET_BASE;
1098   sock.m_socket = child_socket;
1099   sock.m_connected = TRUE;
1100
1101   GSocket_SetTimeout(sock.m_socket, sock.m_timeout * 1000);
1102   GSocket_SetCallback(sock.m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1103                                      GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1104                                      wx_socket_callback, (char *)&sock);
1105
1106   return TRUE;
1107 }
1108
1109 wxSocketBase *wxSocketServer::Accept(bool wait)
1110 {
1111   wxSocketBase* sock = new wxSocketBase();
1112
1113   sock->SetFlags(m_flags);
1114
1115   if (!AcceptWith(*sock, wait))
1116   {
1117     sock->Destroy();
1118     sock = NULL;
1119   }
1120
1121   return sock;
1122 }
1123
1124 bool wxSocketServer::WaitForAccept(long seconds, long milliseconds)
1125 {
1126   return _Wait(seconds, milliseconds, GSOCK_CONNECTION_FLAG);
1127 }
1128
1129 // ==========================================================================
1130 // wxSocketClient
1131 // ==========================================================================
1132
1133 // --------------------------------------------------------------------------
1134 // Ctor and dtor
1135 // --------------------------------------------------------------------------
1136
1137 wxSocketClient::wxSocketClient(wxSocketFlags flags)
1138               : wxSocketBase(flags, wxSOCKET_CLIENT)
1139 {
1140 }
1141
1142 wxSocketClient::~wxSocketClient()
1143 {
1144 }
1145
1146 // --------------------------------------------------------------------------
1147 // Connect
1148 // --------------------------------------------------------------------------
1149
1150 bool wxSocketClient::Connect(wxSockAddress& addr_man, bool wait)
1151 {
1152   GSocketError err;
1153
1154   if (m_socket)
1155   {
1156     // Shutdown and destroy the socket
1157     Close();
1158     GSocket_destroy(m_socket);
1159   }
1160
1161   m_socket = GSocket_new();
1162   m_connected = FALSE;
1163   m_establishing = FALSE;
1164
1165   if (!m_socket)
1166     return FALSE;
1167
1168   GSocket_SetTimeout(m_socket, m_timeout * 1000);
1169   GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1170                                 GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1171                                 wx_socket_callback, (char *)this);
1172
1173   // If wait == FALSE, then the call should be nonblocking.
1174   // When we are finished, we put the socket to blocking mode
1175   // again.
1176
1177   if (!wait)
1178     GSocket_SetNonBlocking(m_socket, 1);
1179
1180   GSocket_SetPeer(m_socket, addr_man.GetAddress());
1181   err = GSocket_Connect(m_socket, GSOCK_STREAMED);
1182
1183   if (!wait)
1184     GSocket_SetNonBlocking(m_socket, 0);
1185
1186   if (err != GSOCK_NOERROR)
1187   {
1188     if (err == GSOCK_WOULDBLOCK)
1189       m_establishing = TRUE;
1190
1191     return FALSE;
1192   }
1193
1194   m_connected = TRUE;
1195   return TRUE;
1196 }
1197
1198 bool wxSocketClient::WaitOnConnect(long seconds, long milliseconds)
1199 {
1200   if (m_connected)                      // Already connected
1201     return TRUE;
1202
1203   if (!m_establishing || !m_socket)     // No connection in progress
1204     return FALSE;
1205
1206   return _Wait(seconds, milliseconds, GSOCK_CONNECTION_FLAG |
1207                                       GSOCK_LOST_FLAG);
1208 }
1209
1210 // ==========================================================================
1211 // wxDatagramSocket
1212 // ==========================================================================
1213
1214 /* NOTE: experimental stuff - might change */
1215
1216 wxDatagramSocket::wxDatagramSocket( wxSockAddress& addr,
1217                                     wxSocketFlags flags )
1218                 : wxSocketBase( flags, wxSOCKET_DATAGRAM )
1219 {
1220   // Create the socket
1221   m_socket = GSocket_new();
1222
1223   if(!m_socket)
1224     return;
1225
1226   // Setup the socket as non connection oriented
1227   GSocket_SetLocal(m_socket, addr.GetAddress());
1228   if( GSocket_SetNonOriented(m_socket) != GSOCK_NOERROR )
1229   {
1230     GSocket_destroy(m_socket);
1231     m_socket = NULL;
1232     return;
1233   }
1234
1235   // Initialize all stuff
1236   m_connected = FALSE;
1237   m_establishing = FALSE;
1238   GSocket_SetTimeout( m_socket, m_timeout );
1239   GSocket_SetCallback( m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1240                                  GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1241                                  wx_socket_callback, (char*)this );
1242
1243 }
1244
1245 wxDatagramSocket& wxDatagramSocket::RecvFrom( wxSockAddress& addr,
1246                                               void* buf,
1247                                               wxUint32 nBytes )
1248 {
1249     Read(buf, nBytes);
1250     GetPeer(addr);
1251     return (*this);
1252 }
1253
1254 wxDatagramSocket& wxDatagramSocket::SendTo( wxSockAddress& addr,
1255                                             const void* buf,
1256                                             wxUint32 nBytes )
1257 {
1258     GSocket_SetPeer(m_socket, addr.GetAddress());
1259     Write(buf, nBytes);
1260     return (*this);
1261 }
1262
1263 // ==========================================================================
1264 // wxSocketModule
1265 // ==========================================================================
1266
1267 class wxSocketModule : public wxModule
1268 {
1269 public:
1270     virtual bool OnInit()
1271     {
1272         // wxSocketBase will call GSocket_Init() itself when/if needed
1273         return TRUE;
1274     }
1275
1276     virtual void OnExit()
1277     {
1278         if ( wxSocketBase::IsInitialized() )
1279             wxSocketBase::Shutdown();
1280     }
1281
1282 private:
1283     DECLARE_DYNAMIC_CLASS(wxSocketModule)
1284 };
1285
1286 IMPLEMENT_DYNAMIC_CLASS(wxSocketModule, wxModule)
1287
1288 #endif
1289   // wxUSE_SOCKETS
1290
1291 // vi:sts=4:sw=4:et