wxBase/GUI separation: 1st step, wxMSW should build, all the rest is broken

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21342 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/pipe.h

@@ -0,0 +1,95 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/unix/pipe.h
+// Purpose:     wxPipe class
+// Author:      Vadim Zeitlin
+// Modified by:
+// Created:     24.06.2003 (extracted from src/unix/utilsunx.cpp)
+// RCS-ID:      $Id$
+// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_UNIX_PIPE_H_
+#define _WX_UNIX_PIPE_H_
+
+#include <unistd.h>
+
+// ----------------------------------------------------------------------------
+// wxPipe: this class encapsulates pipe() system call
+// ----------------------------------------------------------------------------
+
+class wxPipe
+{
+public:
+    // the symbolic names for the pipe ends
+    enum Direction
+    {
+        Read,
+        Write
+    };
+
+    enum
+    {
+        INVALID_FD = -1
+    };
+
+    // default ctor doesn't do anything
+    wxPipe() { m_fds[Read] = m_fds[Write] = INVALID_FD; }
+
+    // create the pipe, return TRUE if ok, FALSE on error
+    bool Create()
+    {
+        if ( pipe(m_fds) == -1 )
+        {
+            wxLogSysError(_("Pipe creation failed"));
+
+            return FALSE;
+        }
+
+        return TRUE;
+    }
+
+    // return TRUE if we were created successfully
+    bool IsOk() const { return m_fds[Read] != INVALID_FD; }
+
+    // return the descriptor for one of the pipe ends
+    int operator[](Direction which) const
+    {
+        wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
+                      _T("invalid pipe index") );
+
+        return m_fds[which];
+    }
+
+    // detach a descriptor, meaning that the pipe dtor won't close it, and
+    // return it
+    int Detach(Direction which)
+    {
+        wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
+                      _T("invalid pipe index") );
+
+        int fd = m_fds[which];
+        m_fds[which] = INVALID_FD;
+
+        return fd;
+    }
+
+    // close the pipe descriptors
+    void Close()
+    {
+        for ( size_t n = 0; n < WXSIZEOF(m_fds); n++ )
+        {
+            if ( m_fds[n] != INVALID_FD )
+                close(m_fds[n]);
+        }
+    }
+
+    // dtor closes the pipe descriptors
+    ~wxPipe() { Close(); }
+
+private:
+    int m_fds[2];
+};
+
+#endif // _WX_UNIX_PIPE_H_
+