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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    kfildes.h

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     Defines a "File Descriptor" from the standpoint of the kernel.

//              Inside the kernel, each process has an array of these file

//      descriptors.  Each file descriptor contains a pointer to the file

//      itself (typically a SYSPIPE), as well as to a device structure of

//      function pointers that can be used to operator on the file pointer.

//

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015-2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

#ifndef KFILDES_H

#define KFILDES_H

struct  TASK_S;

#define FILENO_STDIN    0

#define FILENO_STDOUT   1

#define FILENO_STDERR   2

#define FILENO_AUX      3

#define MAX_FILDES      4

typedef void    (*RWFDFUN)(struct TASK_S *,int, void *, int);

typedef struct  {

        void    (*write)(struct TASK_S *tsk, int id, void *buf, int len);

        void    (*read)( struct TASK_S *tsk, int id, void *buf, int len);

        void    (*close)(struct TASK_S *tsk, int id);

} KDEVICE;

typedef struct {

        int     id;

        KDEVICE *dev;

} KFILDES;

#ifndef NULL

#define NULL    (void *)0

#endif

KFILDES *kopen(int id, KDEVICE *dev);

#endif