Which of the following operations should only be allowed to be done when the CPU is in kernel mode? Group of answer choices 1) Read data from a file 2) Open a file for reading, writing, or both 3) Set the time-of-day clock 4) Read the time-of-day clock A programmer opened a file using the file descriptor fd. The file contains the following sequence of bytes: 12, 14, 33, 33, 33, 12, 14, 1, 6, 33, 12, 14, 1, 6, 12 The programmer then uses these two system calls: lseek(fd, 3, SEEK_SET); read(fd, &buffer, 4); note, the lseek call makes a seek to byte 3 of the file. What does buffer contain after the read system call completes? Group of answer choices 1) 33 33 33 12 2) 33 33 12 14 3) 33 12 14 1 4) 33 12 14 In a uniprocessor system, multiprogramming increases processor efficiency by: Group of answer choices 1) All of the above 2) Increasing processor speed 3) Eliminating all idle processor cycles 4) Taking advantage of time wasted by long wait interrupt handling
Which of the following operations should only be allowed to be done when the CPU is in kernel mode? Group of answer choices 1) Read data from a file 2) Open a file for reading, writing, or both 3) Set the time-of-day clock 4) Read the time-of-day clock A programmer opened a file using the file descriptor fd. The file contains the following sequence of bytes: 12, 14, 33, 33, 33, 12, 14, 1, 6, 33, 12, 14, 1, 6, 12 The programmer then uses these two system calls: lseek(fd, 3, SEEK_SET); read(fd, &buffer, 4); note, the lseek call makes a seek to byte 3 of the file. What does buffer contain after the read system call completes? Group of answer choices 1) 33 33 33 12 2) 33 33 12 14 3) 33 12 14 1 4) 33 12 14 In a uniprocessor system, multiprogramming increases processor efficiency by: Group of answer choices 1) All of the above 2) Increasing processor speed 3) Eliminating all idle processor cycles 4) Taking advantage of time wasted by long wait interrupt handling
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Which of the following operations should only be allowed to be done when the CPU is in kernel mode?
Group of answer choices
1) Read data from a file
2) Open a file for reading, writing, or both
3) Set the time-of-day clock
4) Read the time-of-day clock
A programmer opened a file using the file descriptor fd. The file contains the following sequence of bytes:
12, 14, 33, 33, 33, 12, 14, 1, 6, 33, 12, 14, 1, 6, 12
The programmer then uses these two system calls:
lseek(fd, 3, SEEK_SET);
read(fd, &buffer, 4);
note, the lseek call makes a seek to byte 3 of the file. What does buffer contain after the read system call completes?
Group of answer choices
1) 33 33 33 12
2) 33 33 12 14
3) 33 12 14 1
4) 33 12 14
In a uniprocessor system, multiprogramming increases processor efficiency by:
Group of answer choices
1) All of the above
2) Increasing processor speed
3) Eliminating all idle processor cycles
4) Taking advantage of time wasted by long wait interrupt handling
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