src/unix/appunix.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/unix/appunix.cpp
   3 // Purpose:     wxAppConsole with wxMainLoop implementation
   4 // Author:      Lukasz Michalski
   5 // Created:     28/01/2005
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) Lukasz Michalski
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #include "wx/app.h"
  12 #include "wx/log.h"
  13 #include "wx/evtloop.h"
  14
  15 #include <signal.h>
  16 #include <unistd.h>
  17
  18 // use unusual names for arg[cv] to avoid clashes with wxApp members with the
  19 // same names
  20 bool wxAppConsole::Initialize(int& argc_, wxChar** argv_)
  21 {
  22     if ( !wxAppConsoleBase::Initialize(argc_, argv_) )
  23         return false;
  24
  25     sigemptyset(&m_signalsCaught);
  26
  27     return true;
  28 }
  29
  30 void wxAppConsole::HandleSignal(int signal)
  31 {
  32     wxAppConsole * const app = wxTheApp;
  33     if ( !app )
  34         return;
  35
  36     sigaddset(&(app->m_signalsCaught), signal);
  37     app->WakeUpIdle();
  38 }
  39
  40 void wxAppConsole::CheckSignal()
  41 {
  42     for ( SignalHandlerHash::iterator it = m_signalHandlerHash.begin();
  43           it != m_signalHandlerHash.end();
  44           ++it )
  45     {
  46         int sig = it->first;
  47         if ( sigismember(&m_signalsCaught, sig) )
  48         {
  49             sigdelset(&m_signalsCaught, sig);
  50             (it->second)(sig);
  51         }
  52     }
  53 }
  54
  55 // the type of the signal handlers we use is "void(*)(int)" while the real
  56 // signal handlers are extern "C" and so have incompatible type and at least
  57 // Sun CC warns about it, so use explicit casts to suppress these warnings as
  58 // they should be harmless
  59 extern "C"
  60 {
  61     typedef void (*SignalHandler_t)(int);
  62 }
  63
  64 bool wxAppConsole::SetSignalHandler(int signal, SignalHandler handler)
  65 {
  66     const bool install = (SignalHandler_t)handler != SIG_DFL &&
  67                          (SignalHandler_t)handler != SIG_IGN;
  68
  69     struct sigaction sa;
  70     memset(&sa, 0, sizeof(sa));
  71     sa.sa_handler = (SignalHandler_t)&wxAppConsole::HandleSignal;
  72     sa.sa_flags = SA_RESTART;
  73     int res = sigaction(signal, &sa, 0);
  74     if ( res != 0 )
  75     {
  76         wxLogSysError(_("Failed to install signal handler"));
  77         return false;
  78     }
  79
  80     if ( install )
  81         m_signalHandlerHash[signal] = handler;
  82     else
  83         m_signalHandlerHash.erase(signal);
  84
  85     return true;
  86 }
  87