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/log.h"
  28 #include "wx/private/fdiodispatcher.h"
  29 #include "wx/unix/private/fdiounix.h"
  30
  31 // ============================================================================
  32 // wxFDIOManagerUnix implementation
  33 // ============================================================================
  34
  35 int wxFDIOManagerUnix::AddInput(wxFDIOHandler *handler, int fd, Direction d)
  36 {
  37     wxFDIODispatcher * const dispatcher = wxFDIODispatcher::Get();
  38     wxCHECK_MSG( dispatcher, -1, "can't monitor FDs without FD IO dispatcher" );
  39
  40     // translate our direction to dispatcher flags
  41     const int flag = d == INPUT ? wxFDIO_INPUT : wxFDIO_OUTPUT;
  42
  43     // we need to either register this FD with the dispatcher or update an
  44     // existing registration depending on whether it had been previously
  45     // registered for anything or not
  46     bool ok;
  47     const int regmask = handler->GetRegisteredEvents();
  48     if ( !regmask )
  49     {
  50         ok = dispatcher->RegisterFD(fd, handler, flag);
  51     }
  52     else
  53     {
  54         ok = dispatcher->ModifyFD(fd, handler, regmask | flag);
  55     }
  56
  57     if ( !ok )
  58         return -1;
  59
  60     // update the stored mask of registered events
  61     handler->SetRegisteredEvent(flag);
  62
  63     return fd;
  64 }
  65
  66 void wxFDIOManagerUnix::RemoveInput(wxFDIOHandler *handler, int fd, Direction d)
  67 {
  68     wxFDIODispatcher * const dispatcher = wxFDIODispatcher::Get();
  69     if ( !dispatcher )
  70         return;
  71
  72     const int flag = d == INPUT ? wxFDIO_INPUT : wxFDIO_OUTPUT;
  73
  74     // just as in AddInput() above we may need to either just modify the FD or
  75     // remove it completely if we don't need to monitor it any more
  76     bool ok;
  77     const int regmask = handler->GetRegisteredEvents();
  78     if ( regmask == flag )
  79     {
  80         ok = dispatcher->UnregisterFD(fd);
  81     }
  82     else
  83     {
  84         ok = dispatcher->ModifyFD(fd, handler, regmask & ~flag);
  85     }
  86
  87     if ( !ok )
  88     {
  89         wxLogDebug("Failed to unregister %d in direction %d", fd, d);
  90     }
  91
  92     // do this even after a failure to unregister it, we still tried...
  93     handler->ClearRegisteredEvent(flag);
  94 }
  95
  96 wxFDIOManager *wxAppTraits::GetFDIOManager()
  97 {
  98     static wxFDIOManagerUnix s_manager;
  99     return &s_manager;
 100 }
 101