⟩ A user can change the default log-in shell using a) chmod b) chsh c) rmsh d) tchsh
b) chsh
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More Questions for you:
Which signal is generated when we press control-C? a) SIGINT b) SIGTERM c) SIGKILL d) SIGSEGV
If a signal is received by a process, when will it be processed? a) It is processed immediately b) It is processed when process is switching to kernel mode c) It is processsed in the next timeslice given to the process
Which signal is generated when we press ctrl-Z? a) SIGKILL b) SIGSTOP c) SIGABRT d) SIGINT
Which signal is sent when the Child process terminates? a) SIGINIT b) SIGKILL c) SIGSTOP d) SIGCHLD
Which of the following signal cannot be handled or ignored? a) SIGINT b) SIGCHLD c) SIGKILL d) SIGALRM
What happnes as the signal SIGINT hits the current process in the program?
#include<stdio.h>
#include<signal.h>
void response (int);
void response (int sig_no)
{
printf("Linuxn");
}
int main()
{
struct sigaction act;
act.sa_handler = response;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaction(SIGINT,&act,0);
while(1){
printf("googlen");
sleep(1);
}
return 0;
}
a) the process terminates
b) the string "Linux" prints
c) the string "Linux" prints and then process terminates
d) none of the mentionedThis program will print
#include<stdio.h>
#include<signal.h>
#include<unistd.h>
void response (int);
void response (int sig_no)
{
printf("%s is workingn",sys_siglist[sig_no]);
}
int main()
{
alarm(5);
sleep(50);
printf("googlen");
signal(SIGALRM,response);
return 0;
}
a) "google"
b) "Alarm clock"
c) nothing
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
#include<signal.h>
#include<stdlib.h>
void response (int);
void response (int sig_no)
{
printf("%sn",sys_siglist[sig_no]);
printf("This is singal handlern");
}
int main()
{
pid_t child;
int status;
child = fork();
switch (child){
case -1
perror("fork");
exit (1);
case 0
kill(getppid(),SIGKILL);
printf("I am an orphan process because my parent has been killed by men");
printf("Handler failedn");
break;
default
signal(SIGKILL,response);
wait(&status);
printf("The parent process is still aliven");
break;
}
return 0;
}
a) the child process kills the parent process
b) the parent process kills the child process
c) handler function executes as the signal arrives to the parent process
d) none of the mentionedWhich one of the following is not true about this program?
#include<stdio.h>
#include<signal.h>
void response (int);
void response (int signo)
{
printf("%sn",sys_siglist[signo]);
signal(SIGSEGV,SIG_IGN);
}
int main()
{
signal (SIGSEGV,response);
char *str;
*str = 10;
return 0;
}
a) kernel sends SIGSEGV signal to a process as segmentation fault occurs
b) in this process signal handler will execute only one time of recieving the signal SIGSEGV
c) both (a) and (b)
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
#include<signal.h>
void response (int);
void response (int sig_no)
{
printf("%sn",sys_siglist[sig_no]);
}
int main()
{
pid_t child;
int status;
child = fork();
switch(child){
case -1
perror("fork");
case 0
break;
default
signal(SIGCHLD,response);
wait(&status);
break;
}
}
a) this program will print nothing
b) this program will print "Child Exited"
c) segmentation fault
d) none of the mentioned
