src/unix/fdiounix.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/fdiounix.cpp
   3 // Purpose:     wxFDIOManager implementation for console Unix applications
   4 // Author:      Vadim Zeitlin
   5 // Created:     2009-08-17
   6 // RCS-ID:      $Id: wxhead.cpp,v 1.10 2009-06-29 10:23:04 zeitlin Exp $
   7 // Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #include "wx/apptrait.h"
  27 #include "wx/private/fdiodispatcher.h"
  28 #include "wx/unix/private/fdiounix.h"
  29
  30 // ============================================================================
  31 // wxFDIOManagerUnix implementation
  32 // ============================================================================
  33
  34 int wxFDIOManagerUnix::AddInput(wxFDIOHandler *handler, int fd, Direction d)
  35 {
  36     wxFDIODispatcher * const dispatcher = wxFDIODispatcher::Get();
  37     wxCHECK_MSG( dispatcher, -1, "can't monitor FDs without FD IO dispatcher" );
  38
  39     // translate our direction to dispatcher flags
  40     const int flag = d == INPUT ? wxFDIO_INPUT : wxFDIO_OUTPUT;
  41
  42     // we need to either register this FD with the dispatcher or update an
  43     // existing registration depending on whether it had been previously
  44     // registered for anything or not
  45     bool ok;
  46     const int regmask = handler->GetRegisteredEvents();
  47     if ( !regmask )
  48     {
  49         ok = dispatcher->RegisterFD(fd, handler, flag);
  50     }
  51     else
  52     {
  53         ok = dispatcher->ModifyFD(fd, handler, regmask | flag);
  54     }
  55
  56     if ( !ok )
  57         return -1;
  58
  59     // update the stored mask of registered events
  60     handler->SetRegisteredEvent(flag);
  61
  62     return fd;
  63 }
  64
  65 void wxFDIOManagerUnix::RemoveInput(wxFDIOHandler *handler, int fd, Direction d)
  66 {
  67     wxFDIODispatcher * const dispatcher = wxFDIODispatcher::Get();
  68     if ( !dispatcher )
  69         return;
  70
  71     const int flag = d == INPUT ? wxFDIO_INPUT : wxFDIO_OUTPUT;
  72
  73     // just as in AddInput() above we may need to either just modify the FD or
  74     // remove it completely if we don't need to monitor it any more
  75     bool ok;
  76     const int regmask = handler->GetRegisteredEvents();
  77     if ( regmask == flag )
  78     {
  79         ok = dispatcher->UnregisterFD(fd);
  80     }
  81     else
  82     {
  83         ok = dispatcher->ModifyFD(fd, handler, regmask & ~flag);
  84     }
  85
  86     if ( !ok )
  87     {
  88         wxLogDebug("Failed to unregister %d in direction %d", fd, d);
  89     }
  90
  91     // do this even after a failure to unregister it, we still tried...
  92     handler->ClearRegisteredEvent(flag);
  93 }
  94
  95 wxFDIOManager *wxAppTraits::GetFDIOManager()
  96 {
  97     static wxFDIOManagerUnix s_manager;
  98     return &s_manager;
  99 }
 100