include/wx/unix/private/sockunix.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/unix/private/sockunix.h
   3 // Purpose:     wxSocketImpl implementation for Unix systems
   4 // Authors:     Guilhem Lavaux, Vadim Zeitlin
   5 // Created:     April 1997
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 1997 Guilhem Lavaux
   8 //              (c) 2008 Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_UNIX_GSOCKUNX_H_
  13 #define _WX_UNIX_GSOCKUNX_H_
  14
  15 #include <unistd.h>
  16 #include <sys/ioctl.h>
  17 #include "wx/private/fdiodispatcher.h"
  18
  19 class wxSocketImplUnix : public wxSocketImpl,
  20                          public wxFDIOHandler
  21 {
  22 public:
  23     wxSocketImplUnix(wxSocketBase& wxsocket)
  24         : wxSocketImpl(wxsocket)
  25     {
  26         m_fds[0] =
  27         m_fds[1] = -1;
  28
  29         m_use_events = false;
  30         m_enabledCallbacks = 0;
  31     }
  32
  33     virtual void Shutdown();
  34     virtual wxSocketImpl *WaitConnection(wxSocketBase& wxsocket);
  35
  36     int Read(void *buffer, int size);
  37     int Write(const void *buffer, int size);
  38     //attach or detach from main loop
  39     void Notify(bool flag);
  40
  41     // wxFDIOHandler methods
  42     virtual void OnReadWaiting();
  43     virtual void OnWriteWaiting();
  44     virtual void OnExceptionWaiting();
  45
  46     // Unix-specific functions
  47     bool HasAnyEnabledCallbacks() const { return m_enabledCallbacks != 0; }
  48     void EnableCallback(wxFDIODispatcherEntryFlags flag)
  49         { m_enabledCallbacks |= flag; }
  50     void DisableCallback(wxFDIODispatcherEntryFlags flag)
  51         { m_enabledCallbacks &= ~flag; }
  52     int GetEnabledCallbacks() const { return m_enabledCallbacks; }
  53
  54 private:
  55     virtual wxSocketError DoHandleConnect(int ret);
  56     virtual void DoClose()
  57     {
  58         wxSocketManager * const manager = wxSocketManager::Get();
  59         if ( manager )
  60         {
  61             manager->Uninstall_Callback(this, wxSOCKET_INPUT);
  62             manager->Uninstall_Callback(this, wxSOCKET_OUTPUT);
  63         }
  64
  65         close(m_fd);
  66     }
  67
  68     virtual void UnblockAndRegisterWithEventLoop()
  69     {
  70         int trueArg = 1;
  71         ioctl(m_fd, FIONBIO, &trueArg);
  72
  73         EnableEvents();
  74     }
  75
  76     // enable or disable notifications for socket input/output events but only
  77     // if m_use_events is true; do nothing otherwise
  78     virtual void EnableEvents()
  79     {
  80         if ( m_use_events )
  81             DoEnableEvents(true);
  82     }
  83
  84     void DisableEvents()
  85     {
  86         if ( m_use_events )
  87             DoEnableEvents(false);
  88     }
  89
  90     // really enable or disable socket input/output events, regardless of
  91     // m_use_events value
  92     void DoEnableEvents(bool enable);
  93
  94
  95     // enable or disable events for the given event if m_use_events; do nothing
  96     // otherwise
  97     //
  98     // notice that these functions also update m_detected: EnableEvent() clears
  99     // the corresponding bit in it and DisableEvent() sets it
 100     void EnableEvent(wxSocketNotify event);
 101     void DisableEvent(wxSocketNotify event);
 102
 103     int Recv_Stream(void *buffer, int size);
 104     int Recv_Dgram(void *buffer, int size);
 105     int Send_Stream(const void *buffer, int size);
 106     int Send_Dgram(const void *buffer, int size);
 107
 108
 109 protected:
 110     // true if socket should fire events
 111     bool m_use_events;
 112
 113     // descriptors for input and output event notification channels associated
 114     // with the socket
 115     int m_fds[2];
 116
 117     // the events which are currently enabled for this socket, combination of
 118     // wxFDIO_INPUT and wxFDIO_OUTPUT values
 119     //
 120     // TODO: this overlaps with m_detected but the semantics of the latter are
 121     //       very unclear so I don't dare to remove it right now
 122     int m_enabledCallbacks;
 123
 124 private:
 125     // notify the associated wxSocket about a change in socket state and shut
 126     // down the socket if the event is wxSOCKET_LOST
 127     void OnStateChange(wxSocketNotify event);
 128
 129     // give it access to our m_fds
 130     friend class wxSocketFDBasedManager;
 131 };
 132
 133 // A version of wxSocketManager which uses FDs for socket IO
 134 class wxSocketFDBasedManager : public wxSocketManager
 135 {
 136 public:
 137     // no special initialization/cleanup needed when using FDs
 138     virtual bool OnInit() { return true; }
 139     virtual void OnExit() { }
 140
 141 protected:
 142     // identifies either input or output direction
 143     //
 144     // NB: the values of this enum shouldn't change
 145     enum SocketDir
 146     {
 147         FD_INPUT,
 148         FD_OUTPUT
 149     };
 150
 151     // get the FD index corresponding to the given wxSocketNotify
 152     SocketDir GetDirForEvent(wxSocketImpl *socket, wxSocketNotify event)
 153     {
 154         switch ( event )
 155         {
 156             default:
 157                 wxFAIL_MSG( "unexpected socket event" );
 158                 // fall through
 159
 160             case wxSOCKET_LOST:
 161                 // fall through
 162
 163             case wxSOCKET_INPUT:
 164                 return FD_INPUT;
 165
 166             case wxSOCKET_OUTPUT:
 167                 return FD_OUTPUT;
 168
 169             case wxSOCKET_CONNECTION:
 170                 // FIXME: explain this?
 171                 return socket->m_server ? FD_INPUT : FD_OUTPUT;
 172         }
 173     }
 174
 175     // access the FDs we store
 176     int& FD(wxSocketImplUnix *socket, SocketDir d)
 177     {
 178         return socket->m_fds[d];
 179     }
 180 };
 181
 182 // Common base class for all ports using X11-like (and hence implemented in
 183 // X11, Motif and GTK) AddInput() and RemoveInput() functions
 184 class wxSocketInputBasedManager : public wxSocketFDBasedManager
 185 {
 186 public:
 187     virtual void Install_Callback(wxSocketImpl *socket_, wxSocketNotify event)
 188     {
 189         wxSocketImplUnix * const
 190             socket = static_cast<wxSocketImplUnix *>(socket_);
 191
 192         wxCHECK_RET( socket->m_fd != -1,
 193                         "shouldn't be called on invalid socket" );
 194
 195         const SocketDir d = GetDirForEvent(socket, event);
 196
 197         int& fd = FD(socket, d);
 198         if ( fd != -1 )
 199             RemoveInput(fd);
 200
 201         fd = AddInput(socket, socket->m_fd, d);
 202     }
 203
 204     virtual void Uninstall_Callback(wxSocketImpl *socket_, wxSocketNotify event)
 205     {
 206         wxSocketImplUnix * const
 207             socket = static_cast<wxSocketImplUnix *>(socket_);
 208
 209         const SocketDir d = GetDirForEvent(socket, event);
 210
 211         int& fd = FD(socket, d);
 212         if ( fd != -1 )
 213         {
 214             RemoveInput(fd);
 215             fd = -1;
 216         }
 217     }
 218
 219 private:
 220     // these functions map directly to XtAdd/RemoveInput() or
 221     // gdk_input_add/remove()
 222     virtual int AddInput(wxFDIOHandler *handler, int fd, SocketDir d) = 0;
 223     virtual void RemoveInput(int fd) = 0;
 224 };
 225
 226 #endif  /* _WX_UNIX_GSOCKUNX_H_ */