Signal Handling Question:
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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

Linux Signal Handling Interview Question
Linux Signal Handling Interview Question

Answer:

c) both child and parent process ignores the signal
Explanation:
If a process ignores a signal then by default its child also ignores that signal.
Output:
[root@localhost google]# gcc -o san san.c
[root@localhost google]# ./san
Parent Process
Child Process
Child Process
^CChild Process
^CChild Process
^CChild Process
^Z
[3]+ Stopped ./san
[root@localhost signal]#

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

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

void response (int);
void response (int sig_no)
{
printf("%s",sys_siglist[sig_no]);
}
int main()
{
signal(SIGINT,response);
while(1){
printf("googlen");
sleep(1);
}
return 0;
}
a) Interrupt
b) Stop
c) Terminate
d) none of the mentioned		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