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