The OS controls an I/O device by (circle one) a. sending a message to the device

Question

The OS controls an I/O device by (circle one) a. sending a message to the device's port b. using CPU instructions specific to that device c. writing to registers in the device's controller The following shows a state of the very simple file system, and system call. Fill in the two blanks to get the state of the file system after the system call. inode bitmap 11110000 inodes [d a:0 r:6] [f a:-1 r:2] [f a:-1 r:1] [f a:-1 r:1] [] [] [] [] data bitmap 10000000 data [(., 0) (.., 0) (x, 1) (q, 2) (0, 1) (h, 3)] [] [] [] [][] [] [] unlink("/x"); inode bitmap 11110000 inodes [f a:-1 r:1] [f a:-1 r:1] [] [] [] [] data bitmap 10000000 data [(., 0) (.., 0) (q, 2) (0, 1) (h, 3)] [] [] [] [] [] [] []

Explanation / Answer

8. Option C

The operating system controls input output device by writing it to registers in the devices controller.

9. After system cal in this case I nodes does not vary and it is same as the above

[d a:0 r:6] [f a:-1 r:2]

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