wxWidgets/include/wx/unix/pipe.h
Vadim Zeitlin 2887179b1f compilation fixes for separate build
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21420 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2003-06-26 01:14:22 +00:00

121 lines
2.9 KiB
C++

///////////////////////////////////////////////////////////////////////////////
// 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>
#include "wx/log.h"
#include "wx/intl.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];
};
#if wxUSE_STREAMS
#include "wx/wfstream.h"
// ----------------------------------------------------------------------------
// wxPipeInputStream: stream for reading from a pipe
// ----------------------------------------------------------------------------
class wxPipeInputStream : public wxFileInputStream
{
public:
wxPipeInputStream(int fd) : wxFileInputStream(fd) { }
// return TRUE if the pipe is still opened
bool IsOpened() const { return !Eof(); }
// return TRUE if we have anything to read, don't block
virtual bool CanRead() const;
};
#endif // wxUSE_STREAMS
#endif // _WX_UNIX_PIPE_H_