src/common/process.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        process.cpp
   3 // Purpose:     Process termination classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by: Vadim Zeitlin to check error codes, added Detach() method
   6 // Created:     24/06/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "process.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #include "wx/process.h"
  32
  33 // ----------------------------------------------------------------------------
  34 // event tables and such
  35 // ----------------------------------------------------------------------------
  36
  37 DEFINE_EVENT_TYPE(wxEVT_END_PROCESS)
  38
  39 IMPLEMENT_DYNAMIC_CLASS(wxProcess, wxEvtHandler)
  40 IMPLEMENT_DYNAMIC_CLASS(wxProcessEvent, wxEvent)
  41
  42 // ============================================================================
  43 // wxProcess implementation
  44 // ============================================================================
  45
  46 // ----------------------------------------------------------------------------
  47 // wxProcess creation
  48 // ----------------------------------------------------------------------------
  49
  50 void wxProcess::Init(wxEvtHandler *parent, int id, bool redirect)
  51 {
  52     if ( parent )
  53         SetNextHandler(parent);
  54
  55     m_id         = id;
  56     m_redirect   = redirect;
  57
  58 #if wxUSE_STREAMS
  59     m_inputStream  = NULL;
  60     m_errorStream  = NULL;
  61     m_outputStream = NULL;
  62 #endif // wxUSE_STREAMS
  63 }
  64
  65 // ----------------------------------------------------------------------------
  66 // wxProcess termination
  67 // ----------------------------------------------------------------------------
  68
  69 wxProcess::~wxProcess()
  70 {
  71 #if wxUSE_STREAMS
  72     delete m_inputStream;
  73     delete m_errorStream;
  74     delete m_outputStream;
  75 #endif // wxUSE_STREAMS
  76 }
  77
  78 void wxProcess::OnTerminate(int pid, int status)
  79 {
  80     wxProcessEvent event(m_id, pid, status);
  81
  82     if ( !ProcessEvent(event) )
  83         delete this;
  84     //else: the object which processed the event is responsible for deleting
  85     //      us!
  86 }
  87
  88 void wxProcess::Detach()
  89 {
  90     SetNextHandler(NULL);
  91 }
  92
  93 // ----------------------------------------------------------------------------
  94 // process IO redirection
  95 // ----------------------------------------------------------------------------
  96
  97 #if wxUSE_STREAMS
  98
  99 void wxProcess::SetPipeStreams(wxInputStream *inputSstream,
 100                                wxOutputStream *outputStream,
 101                                wxInputStream *errorStream)
 102 {
 103     m_inputStream  = inputSstream;
 104     m_errorStream  = errorStream;
 105     m_outputStream = outputStream;
 106 }
 107
 108 #endif // wxUSE_STREAMS
 109
 110 // ----------------------------------------------------------------------------
 111 // process killing
 112 // ----------------------------------------------------------------------------
 113
 114 /* static */
 115 wxKillError wxProcess::Kill(int pid, wxSignal sig)
 116 {
 117     wxKillError rc;
 118     (void)wxKill(pid, sig, &rc);
 119
 120     return rc;
 121 }
 122
 123 /* static */
 124 bool wxProcess::Exists(int pid)
 125 {
 126     switch ( wxProcess::Kill(pid, wxSIGNONE) )
 127     {
 128         case wxKILL_OK:
 129         case wxKILL_ACCESS_DENIED:
 130             return TRUE;
 131
 132         default:
 133         case wxKILL_ERROR:
 134         case wxKILL_BAD_SIGNAL:
 135             wxFAIL_MSG( _T("unexpected wxProcess::Kill() return code") );
 136             // fall through
 137
 138         case wxKILL_NO_PROCESS:
 139             return FALSE;
 140     }
 141 }
 142