mirror of
https://github.com/sheumann/hush.git
synced 2024-12-23 05:29:58 +00:00
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*
|
|
* io.h --- the I/O manager abstraction
|
|
*
|
|
* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#ifndef _EXT2FS_EXT2_IO_H
|
|
#define _EXT2FS_EXT2_IO_H
|
|
|
|
/*
|
|
* ext2_loff_t is defined here since unix_io.c needs it.
|
|
*/
|
|
#if defined(__GNUC__) || defined(HAS_LONG_LONG)
|
|
typedef long long ext2_loff_t;
|
|
#else
|
|
typedef long ext2_loff_t;
|
|
#endif
|
|
|
|
/* llseek.c */
|
|
/* ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int); */
|
|
#ifdef CONFIG_LFS
|
|
# define ext2fs_llseek lseek64
|
|
#else
|
|
# define ext2fs_llseek lseek
|
|
#endif
|
|
|
|
typedef struct struct_io_manager *io_manager;
|
|
typedef struct struct_io_channel *io_channel;
|
|
|
|
#define CHANNEL_FLAGS_WRITETHROUGH 0x01
|
|
|
|
struct struct_io_channel {
|
|
errcode_t magic;
|
|
io_manager manager;
|
|
char *name;
|
|
int block_size;
|
|
errcode_t (*read_error)(io_channel channel,
|
|
unsigned long block,
|
|
int count,
|
|
void *data,
|
|
size_t size,
|
|
int actual_bytes_read,
|
|
errcode_t error);
|
|
errcode_t (*write_error)(io_channel channel,
|
|
unsigned long block,
|
|
int count,
|
|
const void *data,
|
|
size_t size,
|
|
int actual_bytes_written,
|
|
errcode_t error);
|
|
int refcount;
|
|
int flags;
|
|
int reserved[14];
|
|
void *private_data;
|
|
void *app_data;
|
|
};
|
|
|
|
struct struct_io_manager {
|
|
errcode_t magic;
|
|
const char *name;
|
|
errcode_t (*open)(const char *name, int flags, io_channel *channel);
|
|
errcode_t (*close)(io_channel channel);
|
|
errcode_t (*set_blksize)(io_channel channel, int blksize);
|
|
errcode_t (*read_blk)(io_channel channel, unsigned long block,
|
|
int count, void *data);
|
|
errcode_t (*write_blk)(io_channel channel, unsigned long block,
|
|
int count, const void *data);
|
|
errcode_t (*flush)(io_channel channel);
|
|
errcode_t (*write_byte)(io_channel channel, unsigned long offset,
|
|
int count, const void *data);
|
|
errcode_t (*set_option)(io_channel channel, const char *option,
|
|
const char *arg);
|
|
int reserved[14];
|
|
};
|
|
|
|
#define IO_FLAG_RW 1
|
|
|
|
/*
|
|
* Convenience functions....
|
|
*/
|
|
#define io_channel_close(c) ((c)->manager->close((c)))
|
|
#define io_channel_set_blksize(c,s) ((c)->manager->set_blksize((c),s))
|
|
#define io_channel_read_blk(c,b,n,d) ((c)->manager->read_blk((c),b,n,d))
|
|
#define io_channel_write_blk(c,b,n,d) ((c)->manager->write_blk((c),b,n,d))
|
|
#define io_channel_flush(c) ((c)->manager->flush((c)))
|
|
#define io_channel_bumpcount(c) ((c)->refcount++)
|
|
|
|
/* io_manager.c */
|
|
extern errcode_t io_channel_set_options(io_channel channel,
|
|
const char *options);
|
|
extern errcode_t io_channel_write_byte(io_channel channel,
|
|
unsigned long offset,
|
|
int count, const void *data);
|
|
|
|
/* unix_io.c */
|
|
extern io_manager unix_io_manager;
|
|
|
|
/* test_io.c */
|
|
extern io_manager test_io_manager, test_io_backing_manager;
|
|
extern void (*test_io_cb_read_blk)
|
|
(unsigned long block, int count, errcode_t err);
|
|
extern void (*test_io_cb_write_blk)
|
|
(unsigned long block, int count, errcode_t err);
|
|
extern void (*test_io_cb_set_blksize)
|
|
(int blksize, errcode_t err);
|
|
|
|
#endif /* _EXT2FS_EXT2_IO_H */
|
|
|