devfs.h

来自「newos is new operation system」· C头文件 代码 · 共 38 行

/*
** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
** Distributed under the terms of the NewOS License.
*/
#ifndef _NEWOS_KERNEL_FS_DEVFS_H
#define _NEWOS_KERNEL_FS_DEVFS_H

#include <kernel/vfs.h>

int bootstrap_devfs(void);

typedef void * dev_ident;
typedef void * dev_cookie;

struct dev_calls {
	int (*dev_open)(dev_ident ident, dev_cookie *cookie);
	int (*dev_close)(dev_cookie cookie);
	int (*dev_freecookie)(dev_cookie cookie);

	int (*dev_seek)(dev_cookie cookie, off_t pos, seek_type st);
	int (*dev_ioctl)(dev_cookie cookie, int op, void *buf, size_t len);

	ssize_t (*dev_read)(dev_cookie cookie, void *buf, off_t pos, ssize_t len);
	ssize_t (*dev_write)(dev_cookie cookie, const void *buf, off_t pos, ssize_t len);

	int (*dev_canpage)(dev_ident ident);
	ssize_t (*dev_readpage)(dev_ident ident, iovecs *vecs, off_t pos);
	ssize_t (*dev_writepage)(dev_ident ident, iovecs *vecs, off_t pos);
};

/* api drivers will use these to publish devices */
int devfs_publish_device(const char *path, dev_ident ident, struct dev_calls *calls);
// the next two return the index generated (or <0 for failure)
int devfs_publish_indexed_device(const char *path, dev_ident ident, struct dev_calls *calls);
int devfs_publish_indexed_directory(const char *path);

#endif