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file.h
51 lines (43 loc) · 1.1 KB
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file.h
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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;
};
struct fdinfoData {
int type;
int ref; // reference count
int inode_num ;
};
// in-memory copy of an inode
struct inode {
uint dev; // Device number
uint inum; // Inode number
int ref; // Reference count
int flags; // I_BUSY, I_VALID
short type; // copy of disk inode
short major;
short minor;
short nlink;
uint size;
uint addrs[NDIRECT+1];
};
#define I_BUSY 0x1
#define I_VALID 0x2
// table mapping major device number to
// device functions
struct devsw {
int (*isdir)(struct inode*);
void (*iread)(struct inode*, struct inode*);
int (*read)(struct inode*, char*, int, int);
int (*write)(struct inode*, char*, int);
};
extern struct devsw devsw[];
#define CONSOLE 1
#define PROCFS 2
#define IS_DEV_DIR(ip) (ip->type == T_DEV && devsw[ip->major].isdir && devsw[ip->major].isdir(ip))
//PAGEBREAK!
// Blank page.