file.h

   1 struct file {
   2   enum { FD_NONE, FD_PIPE, FD_INODE } type;
   3   int ref; // reference count
   4   char readable;
   5   char writable;
   6   struct pipe *pipe;
   7   struct inode *ip;
   8   uint off;
   9 };
  10
  11
  12 // in-core file system types
  13
  14 struct inode {
  15   uint dev;           // Device number
  16   uint inum;          // Inode number
  17   int ref;            // Reference count
  18   int flags;          // I_BUSY, I_VALID
  19
  20   short type;         // copy of disk inode
  21   short major;
  22   short minor;
  23   short nlink;
  24   uint size;
  25   uint addrs[NDIRECT+1];
  26 };
  27
  28 #define I_BUSY 0x1
  29 #define I_VALID 0x2
  30
  31
  32 // device implementations
  33
  34 struct devsw {
  35   int (*read)(struct inode*, char*, int);
  36   int (*write)(struct inode*, char*, int);
  37 };
  38
  39 extern struct devsw devsw[];
  40
  41 #define CONSOLE 1