Linux
practice.

GDB command "frame" is used

What is the difference between the built-in functions rand() and srand() in awk programming?

System call can be implemented using which assembly instruction(s) on x86 processors?

We can list all the breakpoint in GDB by the command

A user does a chmod operation on a file. Which of the following is true?

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");
    if(munmap(ptr,100) == -1)
        perror("munmap");
    if(shm_unlink("shared_mem") == -1)
        perror("shm_unlink");
    return 0;
}

This program can send the request to

#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
 
int main()
{
    int fd_client,fd, len;
    struct sockaddr_in add_server;
    fd_client = socket(AF_INET,SOCK_STREAM,0);
    if (fd_client == -1)
    {
        perror("fd_sock");
        exit(1);
    }
    add_server.sin_family = AF_INET;
    add_server.sin_port = ntohs(4001);
    add_server.sin_addr.s_addr = inet_addr("193.39.0.4");
    len = sizeof(add_server);
    fd  = connect(fd_client,(struct sockaddr*)&add_server,len);
    if(fd == -1)
        perror("connect");
    return 0;
}

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("Linux\n");
    signal(SIGINT,SIG_DFL);
}
int main()
{
    signal(SIGINT,response);
    while(1){
        printf("Example\n");
        sleep(1);
    }
    return 0;
}

What are the sizes of (Integer/Long/Pointer) in LP64 programming model?

Which one of the following is a symlink to the root path as seen by the process?

If we compile the example.c file with the command "gcc -c example.c", then the output file will be

When mv f1 f2 is executed which file's inode is freed?

How to execute ls command inside a vi editor?

Unix is which kind of Operating System?

Which one of the directory does not contain binary files?

If a program is linked against a static library then

By default if any regular file is created, the number of link is displayed as 1 ?

Which is loaded into memory when system is booted?

Which one of the following statement is not true about the format-control letters for printf statement in awk program?

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
 
int main()
{
    int fd, new_fd;
    char *buff;
    buff = (char *)malloc(sizeof(char)*8);
    fd = open("test.c",O_RDONLY);
    new_fd = dup(fd);
    close(fd);
    read(new_fd,buff,8);
    printf("%s\n",buff);
}