In a FAT32 file system which has a cluster size of 4096 bytes, a file has been accidently deleted. Assuming that the file was stored in contiguous clusters, write a step by step procedure to undelete this file assuming that you have a disk editor.
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- A FAT32 filesystem will not mount, but you have been able to view the data in Hexadecimal format. While recovering file system meta data, you find the creation date of a file in hex: 4519 In human readable format, this date is:With linked allocation, each file is a linked list of disk blocks; the disk blocks may be scattered anywhereon the disk. The directory contains a pointer to the first and last blocks of the file. Each block contains a pointerto the next block. Refer to the illustration below. Need help to fill in the codes in void main() --- #include<stdio.h>#include<stdlib.h>#define TOTAL_DISK_BLOCKS 32#define TOTAL_DISK_INODES 8int blockStatus[TOTAL_DISK_BLOCKS]; // free = 0int blockList[TOTAL_DISK_BLOCKS - TOTAL_DISK_INODES]; // list of blocks of a filestruct file_table {char fileName[20];int fileSize;struct block *sb;};struct file_table fileTable[TOTAL_DISK_BLOCKS - TOTAL_DISK_INODES];struct block {int blockNumber;struct block *next;};int AllocateBlocks(int Size) {---}void main(){int i = 0, j = 0, numFiles = 0, nextBlock= 0, ret = 1;char s[20]; struct block *temp;---for(i = 0; i < numFiles; i++) {---ret = AllocateBlocks(fileTable[i].fileSize);---}---//Seed the pseudo-random number…Please write in C/C++Write a program that spawn 2 thread: a producer and a consumer The producer thread MUST open an input file and repeatedly copy values to a CIRCULAR BUFFER The consumer should open an output file and repeatedly copy values from the same circular buffer to the file. If the producer is unable to write to the buffer (because it does not contain enough empty elements), or if the consumer is unable to read from the buffer (because it does not contain enough unread items), then it should proceed to the next iteration, choosing a new random number of bytes to copy.
- In an executable object file that is in executable and linkable format (ELF), which section defines the addresses of the stack and the heap? A. The data section B. The .text section C. These addresses are not defined in the executable object file. Instead, they are assigned by the operating system when the program is loaded in to me D. These addresses are not defined in the executable object file. Instead, they are assigned by the user when the program is running in memory. Reset SelectionPart 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure. Usage: $ ./bad_streamcipher_enc kf pt ctImplementation of a Disk-based Buffer Pool A buffer pool is an area of main memory that has been allocated for the purpose of caching datablocks as they are read from disk. The main purpose of a buffer pool is to minimize disk I/O.Tasks: Implement a disk-based buffer pool application based on the below three buffer poolreplacement schemes: FIFO (first in, first out), LRU (least recently used), and LFU (Leastfrequently used) buffer pool replacement strategies.FIFO (First In, First Out): the oldest data block in the buffer pool is replaced.LRU (Least Recently Used): the least recently accessed data block in the buffer pool is replaced.LFU (Least Frequently Used): the least frequently accessed data block in the buffer pool isreplaced.Initially, the buffer pool is free. Disk blocks are numbered consecutively from the beginning ofthe file with the first block numbered as 0. When I execute your program,First, it asks the user to input the following parameters:o ?: number of blocks in the…
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- Problem 0. Suppose a file contains 100 bytes of data. A program successfully opens it for both reading and writing (i.e., passing the mode O_READWR to open()), and gets back a file descriptor number fd. a. The program, which has a 40-byte buffer, issues a call to read() for 40 bytes. It processes that data, and then repeats the call. Both calls return the exact amount requested. Then it issues a third read, again requesting 40 bytes. What value will it return? (Assume no other program has the file open.) b. Next the program calls write (fd, buffer, 40), and the call returns 40. Then it issues another read() call for 40 bytes. What value does that call return? c. Suppose the programmer needs to read back the 40 bytes just written. First it must use 1seek() to reposition the file pointer. What parameters should it invoke 1seek () with so that the next read call will return the 40 bytes just written?using C language Write a program that creates an array of size 10000, then creates two threads.should requests entrance to the critical section that is controlled through semaphores, reads the values written in the array, and writes it to the screen with the following format: "Consumer consumed item number - from position - with the value -" And to a file named Consumer activity, then exits the critical section, and repeats till the producer finishes productionCourse: Operating Systems write a multi-threadeddirectory copy program. The program will create destination directory and open thesource directory. Then for each file in the source directory it will create a thread. Thethread will copy file from source directory to the destination directory. At the end it willprint the number of files copied. Both the source and destination names will be passed ascommand line arguments. Sample execution is as follows:mtcopy.exe source_dir destination_dirCopied 8 files Note: The answer is availible on chegg.