Chapter 10: UNIX
Operating system [Chapter 6]
What is UNIX?
UNIX is an operating system which was first developed in the 1960s, and has been
under constant development ever since. By operating system, we mean the suite of
programs which make the computer
The Security Problem
Some of the most common types of violations include:
o Breach of Confidentiality - Theft of private or confidential information, such as
credit-card numbers, trade secrets, patents, secret for
Memory: Memory is large array of words or bytes, each with its own address.
Memory Management: Action to manage the memory of computer system using various
methods like partitions, paging, segmentation and virtual memory is ca
Input Output Management
Overview (Principles Of Input/Output H/W)
Management of I/O devices is a very important part of the operating system - so important
and so varied that entire I/O subsystems are devoted to its operation.
( Consider the ra
Introduction To Multiprocessor And Distributed Operating System
Why do we develop distributed systems?
availability of powerful yet cheap microprocessors (PCs, workstations), continuing advances
in communication technology,
What is a distribut
FILE ALLOCATION METHODS
Many files are stored on the same storage device.
Allocation of file means allocate the space for store the file on the disk.
Files are stored in free blocks of disk. each block size is 512 bytes.
Interprocess Communication :
WHAT IS IPC? ( NEED OF IPC)
Multiprogramming operating system has more than one processes, processes can
communicate with each other in system.
Sometime output of one process can be inp
FILE :- File is a collection of related data.
DIRECTORY:- Collection of files and subdirectories.
FILE SYSTEM :- File system is a one part of O.S., which provide the mechanism for on-line
storage and access to both data
During the concurrent process some control problems are faced by the operating system.
Following is the example represent such conditions during the synchronization in system
Consider two process, P1 and P2 and two resources R
CONCEPT OF PROCESS :
S/W is a collection of program.
Program is a Collection of code / instruction.
Process: When program is going for execution is called process.
Processor: - Function of processor is to execute the proc