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/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/app.h"
  19     #include "wx/log.h"
  20 #endif
  21
  22 #include "wx/evtloop.h"
  23
  24 #include <signal.h>
  25 #include <unistd.h>
  26
  27 // use unusual names for arg[cv] to avoid clashes with wxApp members with the
  28 // same names
  29 bool wxAppConsole::Initialize(int& argc_, wxChar** argv_)
  30 {
  31     if ( !wxAppConsoleBase::Initialize(argc_, argv_) )
  32         return false;
  33
  34     sigemptyset(&m_signalsCaught);
  35
  36     return true;
  37 }
  38
  39 void wxAppConsole::HandleSignal(int signal)
  40 {
  41     wxAppConsole * const app = wxTheApp;
  42     if ( !app )
  43         return;
  44
  45     sigaddset(&(app->m_signalsCaught), signal);
  46     app->WakeUpIdle();
  47 }
  48
  49 void wxAppConsole::CheckSignal()
  50 {
  51     for ( SignalHandlerHash::iterator it = m_signalHandlerHash.begin();
  52           it != m_signalHandlerHash.end();
  53           ++it )
  54     {
  55         int sig = it->first;
  56         if ( sigismember(&m_signalsCaught, sig) )
  57         {
  58             sigdelset(&m_signalsCaught, sig);
  59             (it->second)(sig);
  60         }
  61     }
  62 }
  63
  64 // the type of the signal handlers we use is "void(*)(int)" while the real
  65 // signal handlers are extern "C" and so have incompatible type and at least
  66 // Sun CC warns about it, so use explicit casts to suppress these warnings as
  67 // they should be harmless
  68 extern "C"
  69 {
  70     typedef void (*SignalHandler_t)(int);
  71 }
  72
  73 bool wxAppConsole::SetSignalHandler(int signal, SignalHandler handler)
  74 {
  75     const bool install = (SignalHandler_t)handler != SIG_DFL &&
  76                          (SignalHandler_t)handler != SIG_IGN;
  77
  78     struct sigaction sa;
  79     memset(&sa, 0, sizeof(sa));
  80     sa.sa_handler = (SignalHandler_t)&wxAppConsole::HandleSignal;
  81     sa.sa_flags = SA_RESTART;
  82     int res = sigaction(signal, &sa, 0);
  83     if ( res != 0 )
  84     {
  85         wxLogSysError(_("Failed to install signal handler"));
  86         return false;
  87     }
  88
  89     if ( install )
  90         m_signalHandlerHash[signal] = handler;
  91     else
  92         m_signalHandlerHash.erase(signal);
  93
  94     return true;
  95 }
  96