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8 - The UNIX System Interface

Exercise 8-1​

Rewrite the program cat from Chapter 7 using read, write, open and close instead of their standard library equivalents. Perform experiments to determine the relative speeds of the two versions. [1]

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Official solution​

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Exercise 8-2​

Rewrite fopen and _fillbuf with fields instead of explicit bit operations. Compare code size and execution speed. [1]

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Exercise 8-3​

Design and write _flushbuf, fflush, and fclose. [1]

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Exercise 8-4​

The standard library function

int fseek(FILE *fp, long offset, int origin)

is identical to lseek except that fp is a file pointer instead of a file descriptor and the return value is an int status, not a position. Write fseek. Make sure that your fseek coordinates properly with the buffering done for the other functions of the library. [1]

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Exercise 8-5​

Modify the fsize program to print the other information contained in the inode entry. [1]

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Exercise 8-6​

The standard library function calloc(n, size) returns a pointer to n objects of size size, with the storage initialized to zero. Write calloc, by calling malloc or by modifying it. [1]

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Exercise 8-7​

malloc accepts a size request without checking its plausibility; free believes that the block it is asked to free contains a valid size field. Improve these routines so they take more pains with error checking. [1]

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Exercise 8-8​

Write a routine bfree(p, n) that will free an arbitrary block p of n characters into the free list maintained by malloc and free. By using bfree, a user can add a static or external array to the free list at any time. [1]

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