tac(1) command using mmap(2)

Intro

A small and efficient tac(1) UNIX® filter application written while learning mmap(1). Using this as a base case more complex programs can programmed as: tail(1) and head(1).

Usage

The tac.c source code.

$ gcc -Wall tac.c -o tac
$ ./tac tac.c | ./tac
/*
 * $File: tac.c A small and efficient tac(1) using mmap(2)
 * $URL: http://speirofr.appspot.com/files/tac.c
 * $Author: Salva Peiró <speirofr@gmail.com> (c) Copyright 2014.
 * $License: GPLv2.
 */
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>

int main(int argc, char …

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