Linux
practice.

Which of the following is considered as the super daemon in Unix?

Which of the following umask settings allow execute permission to be set by default on regular files

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
 
int main()
{
    int fd, count;
    char ch;
    fd = open("demo.txt",O_RDWR|O_CREAT);
    write(fd,"s",1);
    lseek(fd,0,SEEK_SET);
    write(fd,"d",1);
    lseek(fd,0,0);
    read(fd,&ch,1);
    printf("%c\n",ch);
    return 0;
}

How do you add (append) a file "file1" to the example.tar file

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<sys/mman.h>
 
int main()
{
    int s_id;
    int *ptr;
    s_id = shm_open("shared_mem",O_CREAT|O_RDWR,0666);
    if(s_id == -1)
        perror("shm_open");
    ptr = mmap(NULL,100,PROT_WRITE,MAP_PRIVATE,s_id,0);
    if(ptr == MAP_FAILED);
        perror("mmap");
    ptr = mmap(ptr,100,PROT_WRITE,MAP_PRIVATE,s_id,0);
    if(ptr == MAP_FAILED);
        perror("mmap");
    if(munmap(ptr,100) == -1)
        perror("munmap");
    if(shm_unlink("shared_mem") == -1)
        perror("shm_unlink");
       return 0;
   }

What is the output of this program?

#include<stdio.h>
#include<string.h>
 
int main()
{
    int fd[2];
    int count;
    char buffer[6];
    if( pipe(fd) != 0)
        perror("pipe");
    memset(buffer,'\0',6);
    count=write(fd[1],"Linux",6);
    read(fd[0],buffer,6);
    printf("%s\n",buffer);
    return 0;put
}

In sysfs the device drivers of same . . . . . . . . are expected to provide same functionalities to the user mode application.

This program will print

#include<stdio.h>
#include<signal.h>
#include<unistd.h>
 
void response (int);
void response (int sig_no)
{
    printf("%s is working\n",sys_siglist[sig_no]);
}
int main()
{
    alarm(5);
    sleep(50);
    printf("Example\n");        
    signal(SIGALRM,response);
    return 0;
}

What is the role of linker in the compilation process?

What 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("%d\n",*ptr2);
    return 0;
}

The makefile starts executing from

To use the static library in the program

Which file contains the boot options passed to the kernel?

In GDB which one of the following allows us to specify a variable in terms of the file or function where it is defined?

Using which command you find resource limits to the session?

Which niceness value among the following indicate most favorable scheduling?

Which command removes a directory from directory stack?

Which one of the following variables is used within GDB to hold on to a value and refer to it later?

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
struct st{
    int a;
    char b;
};
 
int main()
{
    struct st *st_ptr;
    st_ptr = malloc(sizeof(struct st));
    printf("%d\n",sizeof(struct st));
    return 0;
}

To feed standard output of one command to standard input of another in a single shell session