38 lines
814 B
C
38 lines
814 B
C
struct file {
|
|
enum { FD_NONE, FD_PIPE, FD_INODE } type;
|
|
int ref; // reference count
|
|
char readable;
|
|
char writable;
|
|
struct pipe *pipe;
|
|
struct inode *ip;
|
|
uint off;
|
|
};
|
|
|
|
|
|
// in-memory copy of an inode
|
|
struct inode {
|
|
uint dev; // Device number
|
|
uint inum; // Inode number
|
|
int ref; // Reference count
|
|
struct sleeplock lock; // protects everything below here
|
|
int valid; // inode has been read from disk?
|
|
|
|
short type; // copy of disk inode
|
|
short major;
|
|
short minor;
|
|
short nlink;
|
|
uint size;
|
|
uint addrs[NDIRECT+1];
|
|
};
|
|
|
|
// table mapping major device number to
|
|
// device functions
|
|
struct devsw {
|
|
int (*read)(struct inode*, int, uint64, int);
|
|
int (*write)(struct inode*, int, uint64, int);
|
|
};
|
|
|
|
extern struct devsw devsw[];
|
|
|
|
#define CONSOLE 1
|