xv6-cs450/file.h
2011-08-29 16:14:44 -04:00

42 lines
762 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-core file system types
struct inode {
uint dev; // Device number
uint inum; // Inode number
int ref; // Reference count
int flags; // I_VALID
struct spinlock lock;
struct sleeplock sleeplock;
short type; // copy of disk inode
short major;
short minor;
short nlink;
uint size;
uint addrs[NDIRECT+1];
};
#define I_VALID 0x1
// device implementations
struct devsw {
int (*read)(struct inode*, char*, int);
int (*write)(struct inode*, char*, int);
};
extern struct devsw devsw[];
#define CONSOLE 1