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 #ifndef SA_RESTART
  28     // don't use for systems which don't define it (at least VMS and QNX)
  29     #define SA_RESTART
  30 #endif
  31
  32 // use unusual names for arg[cv] to avoid clashes with wxApp members with the
  33 // same names
  34 bool wxAppConsole::Initialize(int& argc_, wxChar** argv_)
  35 {
  36     if ( !wxAppConsoleBase::Initialize(argc_, argv_) )
  37         return false;
  38
  39     sigemptyset(&m_signalsCaught);
  40
  41     return true;
  42 }
  43
  44 void wxAppConsole::HandleSignal(int signal)
  45 {
  46     wxAppConsole * const app = wxTheApp;
  47     if ( !app )
  48         return;
  49
  50     sigaddset(&(app->m_signalsCaught), signal);
  51     app->WakeUpIdle();
  52 }
  53
  54 void wxAppConsole::CheckSignal()
  55 {
  56     for ( SignalHandlerHash::iterator it = m_signalHandlerHash.begin();
  57           it != m_signalHandlerHash.end();
  58           ++it )
  59     {
  60         int sig = it->first;
  61         if ( sigismember(&m_signalsCaught, sig) )
  62         {
  63             sigdelset(&m_signalsCaught, sig);
  64             (it->second)(sig);
  65         }
  66     }
  67 }
  68
  69 // the type of the signal handlers we use is "void(*)(int)" while the real
  70 // signal handlers are extern "C" and so have incompatible type and at least
  71 // Sun CC warns about it, so use explicit casts to suppress these warnings as
  72 // they should be harmless
  73 extern "C"
  74 {
  75     typedef void (*SignalHandler_t)(int);
  76 }
  77
  78 bool wxAppConsole::SetSignalHandler(int signal, SignalHandler handler)
  79 {
  80     const bool install = (SignalHandler_t)handler != SIG_DFL &&
  81                          (SignalHandler_t)handler != SIG_IGN;
  82
  83     struct sigaction sa;
  84     memset(&sa, 0, sizeof(sa));
  85     sa.sa_handler = (SignalHandler_t)&wxAppConsole::HandleSignal;
  86     sa.sa_flags = SA_RESTART;
  87     int res = sigaction(signal, &sa, 0);
  88     if ( res != 0 )
  89     {
  90         wxLogSysError(_("Failed to install signal handler"));
  91         return false;
  92     }
  93
  94     if ( install )
  95         m_signalHandlerHash[signal] = handler;
  96     else
  97         m_signalHandlerHash.erase(signal);
  98
  99     return true;
 100 }
 101