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5. Answer the questions on the following program: #include <signal.h> #include <stdio.h> #include <unistd.h> void ouch(int...


5. Answer the questions on the following program:
#include <signal.h>
#include <stdio.h>
#include <unistd.h>

void ouch(int sig)
{
printf("OUCH! -­‐ I got signal %d\n", sig);
}

int main()
{
signal(SIGINT, ouch);
signal(SIGQUIT, ouch);
while(1) {
printf("Hello World!\n");
sleep(1);
}
}

1) What is the output of just running the program?
2) What will happen if you try to use both keyboard signals of terminal interrupt and
terminal quit: Ctrl-­‐C and Ctrl-­‐\ to kill the process?
3) Give exactly necessary commends which can just terminate this process from shell.

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Homework Answers

Answer #1

Dear Student,

Here i have explained the C program as per the requirement.

NOTE:1 Please note that the below programs have been tested on ubuntu 14.04 system and compiled under gcc compiler.

Note: This program will also works in other IDEs.

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

Program..1: -------------------------------------------------------------------------------------------------------------------------------------

#include <signal.h>
#include <stdio.h>
#include <unistd.h>

void ouch(int sig)
{
       printf("OUCH! -­‐ I got signal %d\n", sig);
}


int main()
{
       signal(SIGINT, ouch);
       signal(SIGQUIT, ouch);
       while(1) {
               printf("Hello World!\n");
               sleep(1);
       }
}


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

Answer 1:

1) What is the output of just running the program?

Explanation: If you run the above program then after every 1 second Hellow, World will be printed on the screen.

Here i have attached the expected output of the program...

Output:

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

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

Answer:2

2) What will happen if you try to use both keyboard signals of terminal interrupt and terminal quit: Ctrl-­‐C and Ctrl-­‐\ to kill the process?

Explanation: If you try to press ctrl+c and ctrl+\ then program is not going to terminate. For each signal it will print a different message below screen shot shows this..

if press ctrl+c it will display : ^COUCH! -­‐ I got signal 2

if press ctrl+\ it will display : ^\OUCH! -­‐ I got signal 3

here is the output:

Output:

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

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

Answer No:3

3) Give exactly necessary commends which can just terminate this process from shell.

To stop the program press ctrl+z.

hence pressing ctrl+z just terminate the program or stopped the program.

below screen shot shows this..


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

Kindly Check and Verify Thanks...!!!

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