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/*
* The Unix Channel
*
* by Michel Beaudouin-Lafon
*
* Copyright 1990-1993
* Laboratoire de Recherche en Informatique (LRI)
*
* File descriptors, channels
*
* $Id$
* $CurLog$
*/
#ifndef Channel_H_
#define Channel_H_
#include "cplus_bugs.h"
#include "global.h"
#include "ccu/SmartPointer.h"
// we need read and write system calls
#include <unistd.h>
class UchMsgBuffer;
#ifndef NFILE
#define NFILE 20
#endif
enum IOMODE { IONone = 0, IORead = 1, IOWrite = 2,
IOReadWrite = 3, IOSelect = 4, IOReadSelect = 5,
IOWriteSelect = 6, IOAll = 7 };
// Declarations for inlines
//
extern void _AddRef (int);
extern void _DelRef (int);
extern char* StrReprBuf;
class UchFilDes {
protected:
int Fd;
public:
inline UchFilDes () : Fd (-1) { }
inline UchFilDes (const UchFilDes& fd) { _AddRef (Fd = fd.Fd); }
inline UchFilDes (int fd) { _AddRef (Fd = fd); }
inline ~UchFilDes () { _DelRef (Fd); }
inline operator int () const { return Fd; }
inline UchFilDes& operator = (const UchFilDes& fd) { _DelRef (Fd); Fd = fd.Fd; _AddRef (Fd); return *this; }
inline int FilDes () { return Fd; }
inline void Open (int fd) { _DelRef (Fd); _AddRef (Fd = fd); }
inline void Close () { _DelRef (Fd); Fd = -1; }
inline bool Opened () { return bool (Fd >= 0); }
inline int Read (byte* b, int n) { return read (Fd, (char*) b, n); }
inline int Write (byte* b, int n) { return write (Fd, (const char*) b, n); }
char* StrRepr (char* = StrReprBuf);
};
// This class defines channels, ie file descriptors with handlers for read/write.
// The file descriptor of a channel is immutable: once created, it cannot change;
// this is crucial for channel sets, for instance.
// However, because Copy and operator= are defined,immutability can be
// potentially bypassed...
// UchChannel also derives from CcuSmartData, for building smart pointers
//
class UchChannel;
typedef void (* CH_HANDLER) (UchChannel *);
class UchMultiplexer;
class UchChannel : public CcuSmartData {
friend class UchMultiplexer;
protected:
UchFilDes Fd;
IOMODE Mode;
virtual void AddNotify (UchMultiplexer&);
virtual void RemoveNotify (UchMultiplexer&);
public:
UchChannel ();
UchChannel (int, IOMODE = IOReadWrite);
UchChannel (const UchChannel& ch);
~UchChannel ();
inline void Open (int fd) { if (Fd < 0) Fd.Open (fd); }
inline IOMODE IOMode () const { return Mode; }
inline void SetMode (IOMODE io) { Mode = io; }
int Read (UchMsgBuffer&);
int Write (UchMsgBuffer&);
bool ReadBuffer (UchMsgBuffer&);
bool WriteBuffer (UchMsgBuffer&);
UchChannel* Accept ();
virtual UchChannel* Copy () const;
virtual void HandleWrite ();
virtual void HandleRead ();
virtual bool HandleSelect ();
inline int FilDes () const { return Fd; }
inline int Read (byte* b, int n) { return read (FilDes (), (char*) b, n); }
inline int Write (byte* b, int n) { return write (FilDes (), (const char*) b, n); }
inline operator int () { return Fd; }
inline char* StrRepr (char* s = StrReprBuf) { return Fd.StrRepr (s); }
static CH_HANDLER ReadHandler;
static CH_HANDLER WriteHandler;
};
PointerClass (pUchChannel, UchChannel)
#endif /* Channel_H_ */
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