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// device.h
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
// Device is a C++ interface to any UNIX device -- but is designed for use as
// one of the base classes for Converter subclasses which access their device
// via standard read() and write() calls (see conv_device.h).
#ifndef MXV_DEVICE_H
#define MXV_DEVICE_H
#include "InterViews/resource.h"
#include "localdefs.h"
#if !defined(sgi) && !defined(sun)
extern "C" int ioctl(int, unsigned INT32, char*);
#endif
class Device : virtual public Resource {
public:
Device() : fd(0) {}
virtual ~Device() { close(); }
virtual boolean open(const char* name, int mode);
virtual boolean close();
virtual int read(void *buffer, int bytes);
virtual int write(void *buffer, int bytes);
virtual boolean ioctl(unsigned INT32 req, char *argp);
virtual boolean isOpen() { return fd > 0; }
virtual int fdesc() const { return fd; }
private:
int fd;
};
inline boolean
Device::close() {
BUG("Device::close()");
int stat = isOpen() ? ::close(fd) : 0; fd = 0;
return (stat >= 0);
}
inline boolean
Device::open(const char* name, int mode) {
BUG("Device::open()");
boolean stat = ((fd = ::open(name, mode)) > 0);
return stat;
}
inline int
Device::read(void *buffer, int bytes) {
BUG("Device::read()");
return ::read(fdesc(), buffer, bytes);
}
inline int
Device::write(void *buffer, int bytes){
BUG("Device::write()");
return ::write(fdesc(), buffer, bytes);
}
inline boolean
Device::ioctl(unsigned INT32 req, char *argp) {
BUG("Device::ioctl()");
return (::ioctl(fdesc(), req, argp) >= 0);
}
#endif
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