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Viele kennen es schon, für die Restlichen: cdi.fs ist als Interface für Dateisystem-Treiber gedacht.
BTW: Ich habe in letzter Zeit etwas mit fuse gearbeitet. Man könnte sich ja etwas davon inspirieren lassen.
Die 1. drei Funktions-Deklarationen sollten klar sein. cdi_fs_seterror() ermöglicht dem FS-Treiber einen error zu setzen (siehe ferror). Aber eigentlich müsste man das anderst machen, da man ja für jeden Filehandle ferror() machen kann.
cdi_fs_read_data() und cdi_fs_write_data() sind da um dem FS-Treiber Zugriff auf das Speichermedium zu geben.
BTW: Ich habe in letzter Zeit etwas mit fuse gearbeitet. Man könnte sich ja etwas davon inspirieren lassen.
Die 1. drei Funktions-Deklarationen sollten klar sein. cdi_fs_seterror() ermöglicht dem FS-Treiber einen error zu setzen (siehe ferror). Aber eigentlich müsste man das anderst machen, da man ja für jeden Filehandle ferror() machen kann.
cdi_fs_read_data() und cdi_fs_write_data() sind da um dem FS-Treiber Zugriff auf das Speichermedium zu geben.
Code: [Auswählen]
#ifndef _CDI_FS_H_
#define _CDI_FS_H_
#include "types.h"
#include "cdi.h"
#include "cdi/lists.h"
#define CDI_FS_META_NONE 0 /* -/- Invalid Meta read */
#define CDI_FS_META_MODE 1 /* r/w Get/Set permissions */
#define CDI_FS_META_OWNER 2 /* r/w Get/Set owner */
#define CDI_FS_META_GROUP 3 /* r/w Get/Set owner group */
#define CDI_FS_META_TYPE 4 /* r/- Get file type */
#define CDI_FS_META_SIZE 5 /* r/- Get file size */
#define CDI_FS_META_USEDBLOCKS 6 /* r/- Get how many blocks used */
#define CDI_FS_META_CREATETIME 7 /* r/- Get creation time */
#define CDI_FS_META_ACCESSTIME 8 /* r/- Get time of last access */
#define CDI_FS_META_CHANGETIME 9 /* r/- Get time if last change */
#define CDI_FS_ERROR_NONE 0 /* No Error */
#define CDI_FS_ERROR_ONS 1 /* Operation not supported */
#define CDI_FS_ERROR_FNF 2 /* File not found */
#define CDI_FS_ERROR_EOF 3 /* End of file */
#define CDI_FS_ERROR_UNKNOWN 4 /* Unknown error */
typedef enum {
CDI_FS_TYPE_NONE = 0, // Invalid file type
CDI_FS_TYPE_FILE = 1, // normal file
CDI_FS_TYPE_DIR = 2, // Directory
CDI_FS_TYPE_FIF0 = 3, // First-In-First-Out-Pipe
CDI_FS_TYPE_LIFO = 4, // Last-In-First-Out-Pipe (Stack)
CDI_FS_TYPE_BLOCKDEV = 5, // Block device
CDI_FS_TYPE_CHARDEV = 6, // Character device
CDI_FS_TYPE_SYMLINK = 7, // Symbolic link, points to another file
CDI_FS_TYPE_SOCKET = 8, // Unix socket
CDI_FS_TYPE_BUFFER = 9 // Buffer (like file but stored in RAM and will get deleted when closed)
} cdi_filetype_t;
struct cdi_fs_driver {
struct cdi_driver drv;
/**
* Opens a file/pipe/etc and returns file descriptor
* @param path Path to file
* @return File descriptor (negative = Failure)
*/
int (*open)(const char *path);
/**
* Closes a file
* @param fildes File descriptor
* @return 0 = Success
*/
int (*close)(int fildes);
/**
* Creates an file/dir/pipe/etc
* @param path Path to file
* @param type Whether it is a file/dir/etc
* @param mode Permissions
* @return 0 = Success
*/
int (*create)(const char *path,int type,mode_t mode);
/**
* Removes a file/dir/pipe/etc
* @param path Path to dir
* @return 0 = Success
*/
int (*remove)(const char *path);
/**
* Puts filenames of files from dir in list
* @param path Path to dir
* @param content List with filenames
* @return 0 = Success
*/
int (*listdir)(const char *path,cdi_list_t content);
/**
* Sets meta data of a file/dir/pipe/etc
* @param path Path to file/dir/pipe/etc
* @param which Which meta information to set
* @param value Value to set as meta
* @return 0 = Success
*/
void (*setmeta)(const char *path,int which,int value);
/**
* Gets meta data of a file/dir/pipe/etc
* @param path Path to file/dir/pipe/etc
* @param which Which meta information to get
* @return Meta data
*/
int (*getmeta)(const char *path,int which);
/**
* Reads from an opened file
* @param fildes File descriptor of opened file
* @return Byte readed
*/
u8 (*read)(int fildes);
/**
* Writes to an opened file
* @param fildes File descriptor of opened file
* @param byte Byte to write
*/
void (*write)(int fildes,u8 byte);
char *device; ///< @note meinOS specific
};
void cdi_fs_driver_init(struct cdi_fs_driver* driver);
void cdi_fs_driver_destroy(struct cdi_fs_driver* driver);
void cdi_fs_driver_register(struct cdi_fs_driver* driver);
void cdi_fs_seterror(struct cdi_fs_driver* driver,int error);
void cdi_fs_read_data(struct cdi_fs_driver* driver,void *buffer,size_t count);
void cdi_fs_write_data(struct cdi_fs_driver* driver,void *buffer,size_t count);
#endif
