How are file sharing and protection implemented?, Operating System

Assignment Help:

How are file sharing and protection implemented?

To implement file protection and sharing, the system ought to maintain more file and directory attributes than are needed on a single - user system. The most generally used concept is file (or directory) owner (or user) and group. The owner is the user who is able to change attributes and who can grant access. The owner as well has the most control over the file.

The group attribute defines a subset of users who is able to share access to the file. The group IDs and owner of a file (or directory) are stored with the other file attributes. When a user (owner) requests an operation on a file the user ID can be evaluate with the owner attribute to determine if the requesting user is the owner of the file. Similarly, the group IDs is able to be compared. The result point to which permissions are applicable. The system after that applies those permissions to the requested operation and allows or denies it.

 

 


Related Discussions:- How are file sharing and protection implemented?

Which are the different states of a process, Which are the different states...

Which are the different states of a process?   Different status of a process is: New: When the process is created. Running: When instructions are executed. Wait

What is the information associated with an open file, What is the informati...

What is the information associated with an open file? Various pieces of information are associated with  an open file which may be: File pointer Disk location of th

Multiprogramming., In a multiprogramming and time sharing environment sever...

In a multiprogramming and time sharing environment several users share the system simultaneously .what are two such problems?

Tree directory structure, please help us to write a code in c for tree dire...

please help us to write a code in c for tree directory structures.

Cpu scheduling algorithm, Q. A CPU scheduling algorithm determined an orde...

Q. A CPU scheduling algorithm determined an order for the execution of its scheduled processes. Convinced n processes to be scheduled on one processor how numerous possible differ

What are the issues in designing a network-fault tolerance, Fault tolerance...

Fault tolerance : Machine failures, Communication faults, storage device crashes, and decays of storage media must be tolerated by the system to some extent. A fault tolerant sy

Explain types of file allocation- linked list allocation, Linked list alloc...

Linked list allocation: At this time the blocks are stored using linked lists. The block size require not be the same. Thus internal fragmentation is avoided. Consider

Computer organisation, basic advantage of using interrupt initiated data tr...

basic advantage of using interrupt initiated data transfer over transfer under program control without an interrupt

What are the different thread levels?, What are the different thread levels...

What are the different thread levels? There are two broad type of thread implementation: User-Level Threads -- Thread Libraries. Kernel-level Threads -- System Calls.

Can we call trap as an interrupt??, is there any difference between the tra...

is there any difference between the trap and interrupt??

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd