fs.h

Bycore是一个嵌入式操作系统内核。Bycore包括内存管理、任务管理、中断管理、任务互斥、同步与通信管理等功能。Bycore全部由C语言完成

/**
 *  fs.h - A set of APIs that used to handle files and devices. but Bycore has
 *         not supported any file system yet.
 *
 *  Copyright (C) 2008  ZhangHu
 *  All rights reserved.
 *  E-MAIL: [e-mail]
 *
 *  This program is free software: 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
 *  MERCHANTABILITY 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.  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef __FS_H__
#define __FS_H__

#include "include/types.h"
#include "include/list.h"
#include "drivers/device.h"

#define FS_CHDEV 0x00   /* Char device */
#define FS_BLKDEV 0x01  /* Block device */

#define MODE_MASK 0x0FF
#define BLOCK_MASK 0xF00 /* Reserved */

typedef struct _node {
    uword_t fd;     /* File descriptor */
    device_t *device;  /* Pointer to device_t */
    slist_t link;   /* Joint to a TCB that gain it */
}file_node;

/* open - Open a device */
word_t open(const char *path);   /* Pointer to a string that describes the name
                                    of a device. */

/* write - Write data to a device */
uword_t write(word_t fd,        /* A file descriptor */
              const char_t *buf,/* Pointer to a data buffer */
              uword_t nbytes);  /* The length of data buffer. */

/* read - Read data from a device */
uword_t read(word_t fd,         /* A file descriptor */
             char_t *buf,       /* Pointer to a data buffer */
             uword_t nbytes);   /* The length of data buffer. */

/* llseek - Modifies write-read offset of a device */
loff_t llseek(word_t fd,        /* A file descriptor */
              loff_t loff);     /* New write-read offset. */

/* ioctl - Modifies properties of a device */
word_t ioctl(word_t fd,         /* A file descriptor */
             uword_t cmd,       /* Command cord */
             void *arg);        /* Pointer to parameters of command */

/* close - Close a device */
word_t close(word_t fd);        /* A file descriptor */


#endif