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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/process.h"
  28
  29 // ----------------------------------------------------------------------------
  30 // event tables and such
  31 // ----------------------------------------------------------------------------
  32
  33 wxDEFINE_EVENT( wxEVT_END_PROCESS, wxProcessEvent )
  34
  35 IMPLEMENT_DYNAMIC_CLASS(wxProcess, wxEvtHandler)
  36 IMPLEMENT_DYNAMIC_CLASS(wxProcessEvent, wxEvent)
  37
  38 // ============================================================================
  39 // wxProcess implementation
  40 // ============================================================================
  41
  42 // ----------------------------------------------------------------------------
  43 // wxProcess creation
  44 // ----------------------------------------------------------------------------
  45
  46 void wxProcess::Init(wxEvtHandler *parent, int id, int flags)
  47 {
  48     if ( parent )
  49         SetNextHandler(parent);
  50
  51     m_id         = id;
  52     m_pid        = 0;
  53     m_redirect   = (flags & wxPROCESS_REDIRECT) != 0;
  54
  55 #if wxUSE_STREAMS
  56     m_inputStream  = NULL;
  57     m_errorStream  = NULL;
  58     m_outputStream = NULL;
  59 #endif // wxUSE_STREAMS
  60 }
  61
  62 /* static */
  63 wxProcess *wxProcess::Open(const wxString& cmd, int flags)
  64 {
  65     wxASSERT_MSG( !(flags & wxEXEC_SYNC), wxT("wxEXEC_SYNC should not be used." ));
  66     wxProcess *process = new wxProcess(wxPROCESS_REDIRECT);
  67     long pid = wxExecute(cmd, flags, process);
  68     if( !pid )
  69     {
  70         // couldn't launch the process
  71         delete process;
  72         return NULL;
  73     }
  74
  75     process->SetPid(pid);
  76
  77     return process;
  78 }
  79
  80 // ----------------------------------------------------------------------------
  81 // wxProcess termination
  82 // ----------------------------------------------------------------------------
  83
  84 wxProcess::~wxProcess()
  85 {
  86 #if wxUSE_STREAMS
  87     delete m_inputStream;
  88     delete m_errorStream;
  89     delete m_outputStream;
  90 #endif // wxUSE_STREAMS
  91 }
  92
  93 void wxProcess::OnTerminate(int pid, int status)
  94 {
  95     wxProcessEvent event(m_id, pid, status);
  96
  97     if ( !ProcessEvent(event) )
  98         delete this;
  99     //else: the object which processed the event is responsible for deleting
 100     //      us!
 101 }
 102
 103 void wxProcess::Detach()
 104 {
 105     SetNextHandler(NULL);
 106 }
 107
 108 // ----------------------------------------------------------------------------
 109 // process IO redirection
 110 // ----------------------------------------------------------------------------
 111
 112 #if wxUSE_STREAMS
 113
 114 void wxProcess::SetPipeStreams(wxInputStream *inputSstream,
 115                                wxOutputStream *outputStream,
 116                                wxInputStream *errorStream)
 117 {
 118     m_inputStream  = inputSstream;
 119     m_errorStream  = errorStream;
 120     m_outputStream = outputStream;
 121 }
 122
 123 bool wxProcess::IsInputOpened() const
 124 {
 125     return m_inputStream && m_inputStream->GetLastError() != wxSTREAM_EOF;
 126 }
 127
 128 bool wxProcess::IsInputAvailable() const
 129 {
 130     return m_inputStream && m_inputStream->CanRead();
 131 }
 132
 133 bool wxProcess::IsErrorAvailable() const
 134 {
 135     return m_errorStream && m_errorStream->CanRead();
 136 }
 137
 138 #endif // wxUSE_STREAMS
 139
 140 // ----------------------------------------------------------------------------
 141 // process killing
 142 // ----------------------------------------------------------------------------
 143
 144 /* static */
 145 wxKillError wxProcess::Kill(int pid, wxSignal sig, int flags)
 146 {
 147     wxKillError rc;
 148     (void)wxKill(pid, sig, &rc, flags);
 149
 150     return rc;
 151 }
 152
 153 /* static */
 154 bool wxProcess::Exists(int pid)
 155 {
 156     switch ( Kill(pid, wxSIGNONE) )
 157     {
 158         case wxKILL_OK:
 159         case wxKILL_ACCESS_DENIED:
 160             return true;
 161
 162         default:
 163         case wxKILL_ERROR:
 164         case wxKILL_BAD_SIGNAL:
 165             wxFAIL_MSG( _T("unexpected wxProcess::Kill() return code") );
 166             // fall through
 167
 168         case wxKILL_NO_PROCESS:
 169             return false;
 170     }
 171 }
 172