Written by What is called a page fault?
Page fault is referred to the situation when the process addresses a page in the working set of the process but the process fails to locate the page in the working set.
What is called a page fault?
How can you get/set an environment variable from a program?
How can you get/set an environment variable from a
program?
Getting the value of an environment variable is done by using `getenv()’.
Setting the value of an environment variable is done by using `putenv()’.
What is the main goal of the Memory Management?
What is the main goal of the Memory Management?
- It decides which process should reside in the main memory,
- Manages the parts of the virtual address space of a process which is non-core resident.
In what way the validity fault handler concludes?
In what way the validity fault handler concludes?
- It sets the valid bit of the page by clearing the modify bit.
- It recalculates the process priority
What is major difference between the Historic Unix and the new ?
What is major difference between the Historic Unix and the new ?
Historic Unix uses Swapping – entire process is transferred
to the main memory from the swap device, whereas the Unix System V uses Demand Paging – only the part of the process is moved to the main memory. Historic Unix uses one Swap Device and Unix System V allow multiple Swap Devices.
what are features of unix?
what are features of unix?
Main features of unix :
Multi user - More than one user can use the machine
Multitasking- More than one program can be run at a time.
Portability – This means the operating system can be easily
converted to run on different browsers.
what are unix variables?
what are unix variables ?
Variables are a way of passing information from the shell to programs when you run them.
At what mode the fault handler executes?
At what mode the fault handler executes?
At the Kernel Mode.
What is a shell?
What is a shell?
A shell is an interactive user interface to an operating system services that allows an user to enter commands as character strings or through a graphical user interface. Commonly used shells are sh,csh,ks etc.
what is the command which lets you change your password?-passwd
what is the command which lets you change your password?
passwd