⟩ We can change the priority of a running process using (a) nice (b) renice (c) priority cannot be changed for a running process (d) only superuser can change the priority
(b) renice
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More Questions for you:
What is the output of this program?
#include<stdio.h>
#include<stdlib.h>
int main()
{
int ret;
int *ptr;
ptr = (int *)malloc(sizeof(int)*10);
free(ptr);
free(ptr);
return 0;
}
a) it will print nothing
b) it will give segmentaion fault
c) undefined behaviour
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
#include<stdlib.h>
int main()
{
int *ptr1;
while(1){
ptr1 = malloc(1024*1024);
if(ptr1 == 0)
break;
sleep(1);
printf("googlen");
free(ptr1);
}
return 0;
}
a) it will print "google" until the process has been stopeed by any signal
b) it will print nothing
c) segmentation fault
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
#include<stdlib.h>
int main()
{
int *ptr1, *ptr2;
ptr1 = malloc(4);
*ptr1 = 10;
*ptr2 = free(ptr1);
printf("%dn",*ptr2);
return 0;
}
a) 10
b) it will print the address stored in ptr1
c) it will print the address stored in ptr2
d) it will give an errorDo you have any idea what is the output of this program?
#include<stdio.h>
#include<stdlib.h>
int main()
{
int *ptr;
*ptr = 10;
*ptr = 20;
printf("%dn",*ptr);
return 0;
}
a) 10
b) 20
c) segmentation fault
d) none of the mentionedWhat is the output of this program?
#include<stdio.h>
int main()
{
int *ptr;
ptr = (int *)calloc(1,sizeof(int));
*ptr = 10;
printf("%dn",*ptr);
return 0;
}
a) 0
b) -1
c) 10
d) none of the mentionedOn Linux, initrd is a file a) containing root file-system required during bootup b) Contains only scripts to be executed during bootup c) Contains root-file system and drivers required to be preloaded during bootup d) None of the above
Which of the following is not a valid run-level? a) S b) 0 c) 8 d) 1
Which file is read by init to get the default run-level? a) /etc/profile b) /etc/init c) /etc/boot d) /etc/inittab
Which is loaded into memory when system is booted? a) Kernel b) Shell c) Commands d) Script
Which signal is generated when we press control-C? a) SIGINT b) SIGTERM c) SIGKILL d) SIGSEGV
