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/*
* Ivy League
*
* File descriptors, channels
*
* Copyright 1990-2000
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* original code by Michel Beaudouin-Lafon,
* heavily modified by Stephane Chatty and Stephane Sire
*
* $Id$
*
*/
#ifndef Channel_H_
#define Channel_H_
#ifdef __GNUG__
#pragma interface
#endif
#include "cplus_bugs.h"
#include "ivl/bool.h"
#include "IOS.h"
class IvlMsgBuffer;
class IvlString;
// we need read and write system calls
#include <unistd.h>
#ifndef NFILE
#define NFILE 64
#endif
enum IOMODE { IONone = 0, IORead = 1, IOWrite = 2,
IOReadWrite = 3, IOSelect = 4, IOReadSelect = 5,
IOWriteSelect = 6, IOAll = 7 };
extern char* StrReprBuf;
class IvlFd {
private:
static void Use (int);
static void Unuse (int);
protected:
int Fd;
public:
inline IvlFd () : Fd (-1) { }
inline IvlFd (const IvlFd& fd) { Use (Fd = fd.Fd); }
inline IvlFd (int fd) { Use (Fd = fd); }
inline ~IvlFd () { Unuse (Fd); }
inline operator int () const { return Fd; }
inline IvlFd& operator = (const IvlFd& fd) { Unuse (Fd); Fd = fd.Fd; Use (Fd); return *this; }
inline void Open (int fd) { Unuse (Fd); Use (Fd = fd); }
inline void Close () { Unuse (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.
// Be careful with Copy and operator= if redefined because this can
// potentially bypass immutability.
//
class IvlChannel : public IvlIOS {
friend class IvlBaseScheduler;
protected:
IvlFd Fd;
IOMODE Mode;
IvlBaseScheduler* Mpx;
virtual void Added ();
virtual void Removed ();
public:
IvlChannel ();
IvlChannel (int, IOMODE = IOReadWrite);
IvlChannel (const IvlChannel& ch);
~IvlChannel ();
inline void Open (int fd) { if (Fd < 0) Fd.Open (fd); }
inline void Close () { if (Fd.Opened ()) Fd.Close (); }
inline IOMODE IOMode () const { return Mode; }
inline void SetMode (IOMODE io) { Mode = io; }
int Read (IvlMsgBuffer&);
int Write (IvlMsgBuffer&);
bool ReadBuffer (IvlMsgBuffer&);
bool WriteBuffer (IvlMsgBuffer&);
void Add (IvlBaseScheduler*);
void Remove ();
virtual void HandleWrite ();
virtual void HandleRead ();
inline int GetFd () const { return Fd; }
inline int Read (byte* b, int n) { return read (Fd, (char*) b, n); }
inline int Write (const byte* b, int n) { return write (Fd, (const char*) b, n); }
inline operator int () { return Fd; }
inline IvlBaseScheduler* GetScheduler () const { return Mpx; }
inline char* StrRepr (char* s = StrReprBuf) { return Fd.StrRepr (s); }
virtual void WriteLong (lword);
virtual void WriteShort (sword);
virtual void WriteByte (byte);
virtual void WriteChar (char);
virtual void WriteString (const char*);
virtual void WriteBuf (const byte*, int);
virtual bool ReadLong (lword&);
virtual bool ReadShort (sword&);
virtual bool ReadByte (byte&);
virtual bool ReadChar (char&);
virtual int ReadString (char*, int);
virtual int ReadString (IvlString&);
virtual bool ReadBuf (byte*, int);
};
#endif /* Channel_H_ */
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