KERNEL MODULE PROGRAMS

KERNEL MODULE PROGRAMS

/////////////////////////////////////////////////////////////////
Program No. : 1
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// hello-1.c
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// This header file is require for all kernel module.

#include<linux/module.h>

// This header file is require for KERN_INFO macro.
#include<linux/kernel.h>

// This function gets called automatically when module gets loaded by insmod command

// This function returns 0 if it successfully executed otherwise it returns non zero value

int init_module(void)
{
printk(KERN_INFO "Jay ShreeKrishna: module inserted 1\n");
return 0;
}

// This function gets called automatically when module gets removed from memory by rmmod.

void cleanup_module(void)
{
printk(KERN_INFO "Hare Ram: module removed 1\n");
}

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// Makefile

-------------------------------------------------------------------------

obj-m += hello-1.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

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// readme

----------------------------------------------------------------

module name : hello-1

build makefile

$ make

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

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/////////////////////////////////////////////////////////////////

Program No. :- 2

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// hello-2.c

-------------------------------------------------------------------------

// This header file is required by all kernel modules

#include <linux/module.h>

// This header file is required for KERN_INFO

#include <linux/kernel.h>

// This header file is required macroes

#include <linux/init.h>

// This function gets called automatically when module gets loaded by insmod

// This function returns 0 if it successfully executed otherwise it returns non zero value

static int __init hello_2_init(void)

{

printk(KERN_INFO "Jay ShreeKrishna: module inserted 2\n");

return 0;

}

// This function gets called automatically when module gets removed from memory by rmmod //command

static void __exit hello_2_exit(void)

{

printk(KERN_INFO "Hare Ram: module removed 2\n");

}

// Register our init function

module_init(hello_2_init);

// Register our cleanup function

module_exit(hello_2_exit);

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// Makefile

-------------------------------------------------------------------------

obj-m += hello-2.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

-------------------------------------------------------------------------

// readme

-------------------------------------------------------------------------

module name : hello-2

build makefile

$ make

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

-------------------------------------------------------------------------

/////////////////////////////////////////////////////////////////

Program No. :- 3

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// hello-3.c

-------------------------------------------------------------------------

// This header file is required by all kernel modules

#include <linux/module.h>

// This header file is required for KERN_INFO

#include <linux/kernel.h>

// This header file is required macroes

#include <linux/init.h>

// This is used to declare variable named as hello3_data

static int hello3_data __initdata = 0;

// This function gets called automatically when module gets loaded by insmod

// This function returns 0 if it successfully executed otherwise it returns non zero value

static int __init hello_3_init(void)

{

printk(KERN_INFO "Jay ShreeKrishna: module inserted with data %d\n", hello3_data);

return 0;

}

// This function gets called automatically when module gets removed from memory by rmmod

static void __exit hello_3_exit(void)

{

printk(KERN_INFO "Hare Ram: module removed\n");

}

// Register our init function

module_init(hello_3_init);

// Register our cleanup function

module_exit(hello_3_exit);

-------------------------------------------------------------------------

// Makefile

-------------------------------------------------------------------------

obj-m += hello-3.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

-------------------------------------------------------------------------

// readme

-------------------------------------------------------------------------

module name : hello-3

build makefile

$ make

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

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/////////////////////////////////////////////////////////////////

Program No. :- 4

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// hello-4.c

-------------------------------------------------------------------------

// This header file is required by all kernel modules

#include <linux/module.h>

// This header file is required for KERN_INFO

#include <linux/kernel.h>

// This header file is required macroes

#include <linux/init.h>

// Macro for name of author

#define DRIVER_AUTHOR "Sunil Bhagwat"

// Macro for module description

#define DRIVER_DESC   "Demo module"

static int __init init_hello_4(void)

{

printk(KERN_INFO "Jay ShreeKrishna: module inserted 4\n");

return 0;

}

static void __exit cleanup_hello_4(void)

{

printk(KERN_INFO "Hare Ram: module removed 4\n");

}

module_init(init_hello_4);

module_exit(cleanup_hello_4);

// Register name of licance

MODULE_LICENSE("GPL");

// Register name of author

MODULE_AUTHOR(DRIVER_AUTHOR);

// Provide module description

MODULE_DESCRIPTION(DRIVER_DESC);

-------------------------------------------------------------------------

// Makefile

-------------------------------------------------------------------------

obj-m += hello-4.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

-------------------------------------------------------------------------

// readme

-------------------------------------------------------------------------

module name : hello-4

build makefile

$ make

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

-------------------------------------------------------------------------

/////////////////////////////////////////////////////////////////Program No. :- 5

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// hello-5.c

-----------------------------------------------------------------------

// This header file is required by all kernel modules

#include <linux/module.h>

// This header file is required for KERN_INFO

#include <linux/kernel.h>

// This header file is required macroes

#include <linux/init.h>

// This header file is used to get information about the parameters

#include <linux/moduleparam.h>

// Macro for name of author

#define DRIVER_AUTHOR "Sunil Bhagwat"

// Macro for module description

#define DRIVER_DESC   "Demo module with arguments"

int myint = 21;

/*

This macro is used to to register information about the input argument

First parameter is name of variable

Second parameter is its type

Third parameter is its permission

*/

module_param(myint, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

MODULE_PARM_DESC(myint, "Integer variable");

static int __init hello_5_init(void)

{

printk(KERN_INFO "The Integer Value is:  %d\n", myint);

return 0;

}

static void __exit hello_5_exit(void)

{

printk(KERN_INFO "Hare Ram : Removing module\n");

}

module_init(hello_5_init);

module_exit(hello_5_exit);

// Register name of licance

MODULE_LICENSE("GPL");

// Register name of author

MODULE_AUTHOR(DRIVER_AUTHOR);

// Provide module description

MODULE_DESCRIPTION(DRIVER_DESC);

// we can insert our module as insmod myint=11

-------------------------------------------------------------------------

// Makefile

-------------------------------------------------------------------------

obj-m += hello-5.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

-------------------------------------------------------------------------

// readme

-------------------------------------------------------------------------

module name : hello-5

build makefile

$ make

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

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/////////////////////////////////////////////////////////////////Program No. :- 6

-----------------------------------------------------------------------

// first.c

-------------------------------------------------------------------------

// This header file is required by all kernel modules

#include <linux/module.h>

// This header file is required for KERN_INFO

#include <linux/kernel.h>

// This header file is required macroes

#include <linux/init.h>

int init_module(void)

{

              printk(KERN_INFO "Jay ShreeKrishna : Inserting module\n");

              return 0;

}

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// second.c

-------------------------------------------------------------------------

#include <linux/kernel.h>

#include <linux/module.h>

void cleanup_module()

{

            printk(KERN_INFO "Hare Ram : Removing the module\n");

}

-------------------------------------------------------------------------

// Makefile

-------------------------------------------------------------------------

obj-m += firstsecond.o

firstsecond-objs := first.o second.o

all:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

-------------------------------------------------------------------------

// readme

-------------------------------------------------------------------------

module name : hello-6

build makefile

if there is any problem in our kernel then download requred linux headers as

apt-get install build-essential linux-headers-$(uname -r)

get information of our module using modinfo .ko

insert module using sudo insmod .ko

get list of all installed module as lsmod

check kernel log using /var/log/syslog file

remove kernel module using sudo rmmod  .ko

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