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Task 1: Modify a Dummy Read-Only File

1. create a dummy file

we can see that if we try to write to this file as a normal user, we will fail, because the file is only readable to normal users.

Task 1: Create and Install a Kernel Module

simple_module.c

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/* simple_module.c */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>

static int __init simple_module_init(void)
{
        printk("Helloworld.\n");
        return 0;
}
/*
 *The cleanup function of the module.
 */
static void __exit simple_module_exit(void)
{
        printk(KERN_INFO"Exit.\n");
}
module_init(simple_module_init);
module_exit(simple_module_exit);

Exercise 1: Consider the following grammar G, which you have seen in the previous assignment:

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E -> TX
X -> +E | ε
T -> FY
Y -> T | ε
F -> PZ
Z -> *Z | ε
P -> (E) | a | b

1. Please construct the SLR parsing table for G. Is the grammar SLR(1)?