CS -UNIX INTERNALS. PART B. UNIT 1. 1. Explain briefly details about History of UNIX operating system? In , Bell Telephone Laboratories joined. CS/CS/CS/ CSE 22 Unix Internals Notes Regulation | BE Computer Science and Engineering. Department of Computer science and. Class lecture notes for third Year,sixth semester UNIX Internals (Subject Code: CS) is available here in PDF formats for you to download.
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Anna University November December Examinations are going on well and going to finish within this December. Computer Science and Engineering: The u area contains information describing the process that needs to be accessible only when the process is executing. Internally, the kernel distinguishes a special user called the super user, with special privileges for admin process.
No two buffers may simultaneously contain the contents of the same disk block; therefore, every disk block in the buffer pool exists on one and only one hash queue and only once on that queue.
Creation of new file systems? Write short notes on i files ii directories iii permission access and iv special devices of UNIX system. Mention some system calls for controlling processes. The Unix systems became popular in the operating telephone companies, providing a good environment for program development, network transaction operations services, and real-time services.
The kernel does not constantly check to see that a process is still sleeping but waits for the event to occur and awakens the process then. Download these questions and score good marks in examinations. What is inode list?
Partitioning a disk into several file systems makes it easier for administrators to manage the data stored there. When executing read and write system calls, intternals kernel uses the file descriptor to access the user file descriptor table, follows a pointers to the file table and inode table entries, and, from the inode, finds the data in the file.
What is context switch?
Allocating main memory for an executing process. Several reasons have been suggested for the popularity and success of the Unix systems: Other sections, such as symbol table information.
What are file table and user descriptor table?
Use of large logical blocks increases the effective data transfer rate between disk and memory. These are just an expected questions. The kernel is nonpreemptive. Explain in internnals about the history of Unix Operating Systems.
A limit of 64 Kbytes per file. History — Bell Telephone Laboratories was involved in a project with General Electric and the Massachusetts Institute of Technology to develop a multiuser operating system called Multics.
When the kernel accesses a disk block, it searches for a buffer with the appropriate device-block number combination. Introduction to System Concepts Overview of file subsystem Overview of process control subsystem Overview of file subsystem o The integnals representation of a file is given by an inode. The file subsystem manages files, allocating file space, and monitoring free space, controlling access to files and retrieving data for users.
Structure of a regular file? Administrator specifies the size of inode list when configuring file system.
Buffer cache contains the data in recently used disk blocks. The data in internaps buffer corresponds to the data in a logical disk block on a file system.
When to do context switch? These questions are just expected questions which helps you to pass the examinations.
Internal representation of files? What is boot block? Algorithms, the kernel uses to manipulate buffers in the buffer cache. Pipe is a mechanism that allows uinx stream of data to be passed between reader and writer processes.