Signal Handling Question:
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What will happen if we press "Ctrl+c" key two times after running this program?

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

void response(int);
void response(int sig_no)
{
printf("Linuxn");
signal(SIGINT,SIG_DFL);
}
int main()
{
signal(SIGINT,response);
while(1){
printf("googlen");
sleep(1);
}
return 0;
}
a) process will terminate in the first time
b) process will terminate in the second time
c) process will never terminate
d) none of the mentioned

Linux Signal Handling Interview Question
Linux Signal Handling Interview Question

Answer:

c) process will never terminate
Explanation:
According to the signal handler function of this program as the SIGINT signal arrives second time, the signal performs its default operation i.e. termination of the process.
Output:
[root@localhost google]# gcc -o san san.c
[root@localhost google]# ./san
google
google
^CLinux
google
^C
[root@localhost google]#

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Previous QuestionNext Question
What happens as the SIGINT signal hits the running process of this program?

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

int main()
{
pid_t child;
signal(SIGINT,SIG_IGN);
child=fork();
switch(child){
case -1:
perror("fork");
exit(1);
case 0:
while(1){
printf("Child Processn");
sleep(1);
}
break;
default :
while(1){
printf("Parent Processn");
pause();
}
break;
}
return 0;
}
a) child process terminates
b) parent process terminates
c) both child and parent process ignores the signal
d) none of the mentioned		What will happen as we press the "Ctrl+c" key after running this program?

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

void response (int);
void response (int sig_no)
{
printf("Linuxn");
}
int main()
{
signal(SIGINT,response);
while(1){
printf("googlen");
sleep(1);
}
return 0;
}
a) the string "Linux" will print
b) the process will be terminated after printing the string "Linux"
c) the process will terminate
d) none of the mentioned