dolphin/Externals/wxWidgets3/include/wx/unix/pipe.h

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///////////////////////////////////////////////////////////////////////////////
// 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: pipe.h 66152 2010-11-14 14:04:37Z VZ $
// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwidgets.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;
}
// switch the given end of the pipe to non-blocking IO
bool MakeNonBlocking(Direction which)
{
const int flags = fcntl(m_fds[which], F_GETFL, 0);
if ( flags == -1 )
return false;
return fcntl(m_fds[which], F_SETFL, flags | O_NONBLOCK) == 0;
}
// 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 { return m_fds[which]; }
// detach a descriptor, meaning that the pipe dtor won't close it, and
// return it
int Detach(Direction which)
{
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]);
m_fds[n] = INVALID_FD;
}
}
}
// dtor closes the pipe descriptors
~wxPipe() { Close(); }
private:
int m_fds[2];
};
#if wxUSE_STREAMS && wxUSE_FILE
#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;
};
// ----------------------------------------------------------------------------
// wxPipeOutputStream: stream for writing to a pipe
// ----------------------------------------------------------------------------
class wxPipeOutputStream : public wxFileOutputStream
{
public:
wxPipeOutputStream(int fd) : wxFileOutputStream(fd) { }
// Override the base class version to ignore "pipe full" errors: this is
// not an error for this class.
size_t OnSysWrite(const void *buffer, size_t size);
};
#endif // wxUSE_STREAMS && wxUSE_FILE
#endif // _WX_UNIX_PIPE_H_