Case Study 1: UNIX and LINUX
Chapter 10
10.1 History of unix
10.2 Overview of unix
10.3 Processes in unix
10.4 Memory management in unix
10.5 Input/output in unix
10.6 The unix file system
10.7 Security in unix
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UNIX and LINUX - Applied Operating System - Lecture Slides, Slides of Computer Science
These are the Lecture Slides of Applied Operating System which includes Swapping, Virtual Memory, Page Replacement Algorithms, Modeling Page Replacement Algorithms, Design Issues for Paging Systems, Implementation Issues, Segmentation etc. Key important points are: Unix and Linux, History of Unix, Overview of Unix, Processes in Unix, Memory Management in Unix, Input/Output in Unix, Unix File System, Security in Unix, System Calls, Flags for Linux Clone
Typology: Slides
2012/2013
1 / 32
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Case Study 1: UNIX and LINUX
Chapter 10
10.1 History of unix 10.2 Overview of unix 10.3 Processes in unix 10.4 Memory management in unix 10.5 Input/output in unix 10.6 The unix file system 10.7 Security in unix
System Calls for Process Management
s is an error code pid is a process ID residual is the remaining time from the previous alarm
UNIX Scheduler
The UNIX scheduler is based on a multilevel queue structure
Booting UNIX
The sequences of processes used to boot some systems cp
Sharing Files
Two processes can share a mapped file.
A new file mapped simultaneously into two processes
System Calls for Memory Management
- s is an error code
- b and addr are memory addresses
- len is a length
- prot controls protection
- flags are miscellaneous bits
- fd is a file descriptor
- offset is a file offset
Paging in Linux (1)
Linux uses three-level page tables
Paging in Linux (2)
Operation of the buddy algorithm.
Buddy algorithm
Terminal Management
The main POSIX calls for managing the terminal
UNIX I/O (1)
Some of the fields of a typical cdevsw table
Streams
An example of streams in System V
The UNIX File System (1)
Some important directories found in most UNIX systems
The UNIX File System (3)
- Separate file systems
- After mounting (a) (^) (b)
(a) Before mounting. (b) After mounting
Locking Files
(a) File with one lock (b) Addition of a second lock (c) A third lock