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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 DEFINE_EVENT_TYPE(wxEVT_END_PROCESS)
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