Operating System Lab (CSL204)

Table of Contents

Experiments/Programs	Code	Download PDF
01 - Familiarisation of Linux Commands	No Code	Download
02 - Shell Programming	Check Subsection	Download
03 - System Calls	Check Subsection	Download
04 - I/O System Calls	Code	Download
05 - Scheduling Algorithms	Check Subsection	Download
06 - Inter Process Communication using Shared Memory	Check Subsection	Download
07 - IPC using Message Passing (Producer Consumer)	Code	Download
08 - Banker's Algorithm	Code	Download
09 - Memory Allocation for Fixed Partition	Check Subsection	Download
10 - Page Replacement Algorithms	Check Subsection	Download
11 - Disk Scheduling Algorithms	Check Subsection	Download

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Getting Error While Clicking Download?

When clicking on "Download", GitHub may lead to a page saying "Error rendering embedded code, Invalid PDF", even though all files are within this repository.

Solution

The solution to this problem is common to all OS, that is, to download the file from the hamburger menu as in the following screenshot.

Windows (displaying properly)	Solution in Windows (improper display)

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Shell Programs

Programs	Code
01 - Odd or Even	Code
02 - Greatest of Three Numbers	Code
03 - Factorial of Number	Code
04 - Fibonacci Series	Code
05 - Calculator	Code
06 - Prime number upto a limit	Code

Notes

You can run shell programs in any number of ways.

./file.sh

sh file.sh

bash files.sh

source ./file.sh

. ./file.sh

If you are getting errors while running shell scripts, the reasons may be:

• the file includes syntaxes used in C language.
• No proper file privileges for executing, upon which you may have to run the following command assuming the terminal is opened where the file.sh exists:

  chmod +x ./file.sh
  

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System Calls

Program	Code
01 - Exec()	Code
02 - Fork()	Code
03 - getPID()	Code
04 - Stat()	Code
05 - Opendir() Readdir()	Code
06 (a) - Wait()	Code
06 (b) - Waits	Code

Notes before running some programs

Note 1

Keep hello.c in the same folder as exec system call file exists.
Then run the following command in the terminal:

gcc ./hello.c -o hello

followed by compiling your exec system call file as follows:

gcc ./exec.c

Note 2

Keep hello.c in the same folder prior to running stat system call. This is required to display the properties of the file hello.c in terminal.

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Scheduling Algorithms

Program	Code
01 - FCFS	Code
02 - SJF	Code
03 - Round Robin	Code
04 - SRTF	Code
05 - Preemptive Priority	Code
06 - Non Preemptive Priority	Code

Alternative Code	Download	Top

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IPC Using Shared Memory

Program	Code
01 - Shared Memory	Code 1, Code 2
02 - Pipe	Code

Note

Both the files (Code 1 and Code 2) must be downloaded into the same folder.
Then Code 1 should be compiled and ./a.out must be executed. (Nothing will happen at that moment).
Then Code 2 should be compiled and ./a.out must be executed which will display the output.
You can view the output in the following pdf file.

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Memory Allocation Using the Fixed Partition

Program	Code
01 - First Fit	Code
02 - Best Fit	Code
03 - Worst Fit	Code

Alternative Code	Download	Top

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Page Replacement Algorithms

Program	Code
01 - FIFO	Code
02 - LRU	Code
03 - LFU	Code

Alternative Code	Download	Top

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Disk Scheduling

Program	Code
01 - FCFS	Code
02 - SCAN	Code
03 - C-SCAN	Code

Alternative Code	Download	Top

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