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- 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 SelectionStudent information is being held in a data area, where each student record has the following format: The first nine bytes are the student number, held in ASCII The next byte is the course mark The next word is the section identifierThere are well over three hundred such student records that have been loaded sequentially into memory starting at address $10000. The last record loaded is a dummy record with a section identifier of $FFFF, to show the end of the records.Write an assembler subroutine GetMax that will scan the entire list and find the highest mark. If there is a tie, the first student in the list with the highest mark should be found. The subroutine should return the starting address of this record in address register a3.Write a C program to remove an empty directory In this program it is required toread the name of the empty directory and Then need to remove the given empty directory using the system () function.
- (a)What is the biggest size we can have for a file with SFS? (b)Provide data block numbers in sequence that will be read from the disk (only data blocks that contain file data) when read_t (inum, offset, buf1, count) is called in a user program, where inum is the corresponding inode number for the above inode, and buf1 is a pointer that points to a user-defined buffer.5. Assume a file system is using combined indexing scheme to keep track of the blocks allocated to a file, as in Linux/Unix file system. In the inode of a file, there are 12 direct pointers, one single-indirect pointer, one double-indirect pointer, and one triple-indirect pointer. Assume the size of a disk block address (i.e., disk pointer size) is 8 bytes. Assume block size is 4 KB. a) What is the maximum file size? b) How many index blocks are required for files of size 30 KB, 256KB, 15 MB, 512 MB, 32 GB? c) Assume nothing is cached (no disk caching applied in the system) and we know the disk location of the inode of a file of size 1 GB. How many disk accesses are required to access a byte at offset 2^14 (16K) in the file? How many disk accesses are required to access a byte at offset 2^26 in the file?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?
- Computer system there is a total of 16 blocks with file occupying the following set of block number : f1(1,12,6,9,14,2) F2(10,3) F3(7,15,4) Do allocation with indexed allocation method with 3 direct pointers and one index block pointer، draw the file directory and blocks on disk7) For a file system I have chosen to use indexed allocation with 2 KB blocks. 512 bytes is reserved for the header information. The remaining space is used for direct references to the data blocks with one indirect and one 2nd indirect. Assuming 32-bit references, what is the maximum file size possible for this file system? Be sure to show your workings!A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).
- 1. In a certain device, the disk rotates at 5000rpm. a) how long does one revolution take? b) what is the average rotational delay of this disk drive 2. Consider a disk dirve with 1000 tracks, numbered 0 to 999. The request queue has the following composition: 300 740 150 940 200 850 145 555 775 695. The current position is 197 and the previous request was served at 100. For each of the following disk scheduling algorithsm, compute the total distance (in tracks) that the disk arm would move. Include the calculation steps in your answers. 2.1 First - In-First-Out (FIFO) 2.2 Shortest - Service-Time - First (SSTF) 2.3 SCAN (no LOOK variation) 2.4 C-SCAN (No C-LOOK variation)Computer Science 1. List all lines in all .c files in the current working directory that contain 'lookahead' andthen 'ID' later on the same line. Hint: don't forget the pattern for "stuff". 2. If you follow the translation steps in the multi-level paging, the first Page FrameNumber (PFN) gives the address of: a. virtual address space b. page table c. page directorya) A process references five pages, A, B, C, D, and E, in the following order: A; B; C; D; A; B; E; A; B; C; D; E Assume that the replacement algorithm is first-in-first-out (FIFO) and find the number of page transfers during this sequence of references starting with an empty main memory with three-page frames.