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
C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter8: I/o Streams And Data Files
Section8.3: Random File Access
Problem 6E
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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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