59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
|
// Public definitions for the POSIX-like file descriptor emulation layer
|
||
|
|
// that our user-land support library implements for the use of applications.
|
||
|
|
// See the code in the lib directory for the implementation details.
|
||
|
|
|
||
|
|
#ifndef JOS_INC_FD_H
|
||
|
|
#define JOS_INC_FD_H
|
||
|
|
|
||
|
|
#include <inc/types.h>
|
||
|
|
#include <inc/fs.h>
|
||
|
|
|
||
|
|
struct Fd;
|
||
|
|
struct Stat;
|
||
|
|
struct Dev;
|
||
|
|
|
||
|
|
// Per-device-class file descriptor operations
|
||
|
|
struct Dev {
|
||
|
|
int dev_id;
|
||
|
|
const char *dev_name;
|
||
|
|
ssize_t (*dev_read)(struct Fd *fd, void *buf, size_t len);
|
||
|
|
ssize_t (*dev_write)(struct Fd *fd, const void *buf, size_t len);
|
||
|
|
int (*dev_close)(struct Fd *fd);
|
||
|
|
int (*dev_stat)(struct Fd *fd, struct Stat *stat);
|
||
|
|
int (*dev_trunc)(struct Fd *fd, off_t length);
|
||
|
|
};
|
||
|
|
|
||
|
|
struct FdFile {
|
||
|
|
int id;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct Fd {
|
||
|
|
int fd_dev_id;
|
||
|
|
off_t fd_offset;
|
||
|
|
int fd_omode;
|
||
|
|
union {
|
||
|
|
// File server files
|
||
|
|
struct FdFile fd_file;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
struct Stat {
|
||
|
|
char st_name[MAXNAMELEN];
|
||
|
|
off_t st_size;
|
||
|
|
int st_isdir;
|
||
|
|
struct Dev *st_dev;
|
||
|
|
};
|
||
|
|
|
||
|
|
char* fd2data(struct Fd *fd);
|
||
|
|
int fd2num(struct Fd *fd);
|
||
|
|
int fd_alloc(struct Fd **fd_store);
|
||
|
|
int fd_close(struct Fd *fd, bool must_exist);
|
||
|
|
int fd_lookup(int fdnum, struct Fd **fd_store);
|
||
|
|
int dev_lookup(int devid, struct Dev **dev_store);
|
||
|
|
|
||
|
|
extern struct Dev devfile;
|
||
|
|
extern struct Dev devcons;
|
||
|
|
extern struct Dev devpipe;
|
||
|
|
|
||
|
|
#endif // not JOS_INC_FD_H
|