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[wxWidgets.git] / src / common / process.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/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 // Copyright: (c) Guilhem Lavaux
8 // Licence: wxWindows licence
9 /////////////////////////////////////////////////////////////////////////////
10
11 // ============================================================================
12 // declarations
13 // ============================================================================
14
15 // ----------------------------------------------------------------------------
16 // headers
17 // ----------------------------------------------------------------------------
18
19 // For compilers that support precompilation, includes "wx.h".
20 #include "wx/wxprec.h"
21
22 #ifdef __BORLANDC__
23 #pragma hdrstop
24 #endif
25
26 #include "wx/process.h"
27
28 // ----------------------------------------------------------------------------
29 // event tables and such
30 // ----------------------------------------------------------------------------
31
32 wxDEFINE_EVENT( wxEVT_END_PROCESS, wxProcessEvent );
33
34 IMPLEMENT_DYNAMIC_CLASS(wxProcess, wxEvtHandler)
35 IMPLEMENT_DYNAMIC_CLASS(wxProcessEvent, wxEvent)
36
37 // ============================================================================
38 // wxProcess implementation
39 // ============================================================================
40
41 // ----------------------------------------------------------------------------
42 // wxProcess creation
43 // ----------------------------------------------------------------------------
44
45 void wxProcess::Init(wxEvtHandler *parent, int id, int flags)
46 {
47 if ( parent )
48 SetNextHandler(parent);
49
50 m_id = id;
51 m_pid = 0;
52 m_priority = wxPRIORITY_DEFAULT;
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 // we just detach from the next handler of the chain (i.e. our "parent" -- see ctor)
106 // not also from the previous handler like wxEvtHandler::Unlink() would do:
107
108 if (m_nextHandler)
109 m_nextHandler->SetPreviousHandler(m_previousHandler);
110
111 m_nextHandler = NULL;
112 }
113
114 // ----------------------------------------------------------------------------
115 // process IO redirection
116 // ----------------------------------------------------------------------------
117
118 #if wxUSE_STREAMS
119
120 void wxProcess::SetPipeStreams(wxInputStream *inputSstream,
121 wxOutputStream *outputStream,
122 wxInputStream *errorStream)
123 {
124 m_inputStream = inputSstream;
125 m_errorStream = errorStream;
126 m_outputStream = outputStream;
127 }
128
129 bool wxProcess::IsInputOpened() const
130 {
131 return m_inputStream && m_inputStream->GetLastError() != wxSTREAM_EOF;
132 }
133
134 bool wxProcess::IsInputAvailable() const
135 {
136 return m_inputStream && m_inputStream->CanRead();
137 }
138
139 bool wxProcess::IsErrorAvailable() const
140 {
141 return m_errorStream && m_errorStream->CanRead();
142 }
143
144 #endif // wxUSE_STREAMS
145
146 // ----------------------------------------------------------------------------
147 // process killing
148 // ----------------------------------------------------------------------------
149
150 /* static */
151 wxKillError wxProcess::Kill(int pid, wxSignal sig, int flags)
152 {
153 wxKillError rc;
154 (void)wxKill(pid, sig, &rc, flags);
155
156 return rc;
157 }
158
159 /* static */
160 bool wxProcess::Exists(int pid)
161 {
162 switch ( Kill(pid, wxSIGNONE) )
163 {
164 case wxKILL_OK:
165 case wxKILL_ACCESS_DENIED:
166 return true;
167
168 default:
169 case wxKILL_ERROR:
170 case wxKILL_BAD_SIGNAL:
171 wxFAIL_MSG( wxT("unexpected wxProcess::Kill() return code") );
172 // fall through
173
174 case wxKILL_NO_PROCESS:
175 return false;
176 }
177 }
178
179 void wxProcess::SetPriority(unsigned priority)
180 {
181 wxCHECK_RET( priority <= wxPRIORITY_MAX,
182 wxS("Invalid process priority value.") );
183
184 m_priority = priority;
185 }
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