CS604 Operating Systems Assignment No. 02 Solution and Discussion Fall 2014

[Vuhelper]

CS604 Operating Systems Assignment No. 02 Solution and Discussion Fall 2014 Due Date: 10th Dec 2014



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Your assignment must be in .doc format. (Any other formats like scan images, PDF, Zip, rar, bmp, etc will not be accepted).
Save your assignment with your ID (e.g. bc020200786.doc).
No assignment will be accepted through email.


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Assignment

Question 1: (10 Marks)



Write a Unix/Linux base code for creating the pipe for showing the inter process communication, i.e. the child process send message “Hello world” to parent process, which reads it and displays it on the screen.





Question 2: (5 Marks)



Categorize the following examples into Interrupt, signal and traps:



If you write the Code in c language, like a=b/0.
Compile a C program and error occurs Invalid memory access or buffer overflow.
While running a program, you press <Ctrl-C>.
Fatima is doing chatting with her friend, by hitting keystrokes.
Opening a folder by double clicking mouse.

[Vuhelper]

If you write the Code in c language, like a=b/0. traps
Compile a C program and error occurs Invalid memory access or buffer overflow. traps
While running a program, you press <Ctrl-C>. signal
Fatima is doing chatting with her friend, by hitting keystrokes. interrupts
Opening a folder by double clicking mouse. Interrupt
do correct me if i am wrong

[Vuhelper]

signal
A signal is a software interrupt delivered to a process. The operating system uses signals to report exceptional situations to an executing program. Some signals report errors such as references to invalid memory addresses; others report asynchronous events, such as disconnection of a phone line.

Interrupt and Trap
There are two hinderances to a process. Interrupt and trap.
Interrupt is when the process needs some I/O services whereas trap occurs due to some fault or exception in the code.

trap
A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code.