1. During the install‚ the option to sync with NTP (Network Time Protocol) server was checked. From a security perspective‚ why is it important for a system to keep accurate time? UNIX systems base their notion of time on interrupts generated by the hardware clock. Delays in processing these interrupts because UNIX systems clocks to lose time slowly but erratically. These small changes in timekeeping are what the time scientist call jitter. The Time protocol provided a server’s notion of time in
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Types of Operating Systems Within the broad family of operating systems‚ there are generally four types‚ categorized based on the types of computers they control and the sort of applications they support. The categories are: * Real-time operating system (RTOS) - Real-time operating systems are used to control machinery‚ scientific instruments and industrial systems. An RTOS typically has very little user-interface capability‚ and no end-user utilities‚ since the system will be a "sealed box"
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R.V COLLEGE OF ENGINEERING. DEPARTMENT OF MASTER OF COMPUTER APPLICATIONS IV Semester : I internals UNIX SYSTEM PROGRAMMING. Date : 08-03-2009 Sub Code:07MCA452 Time :9.15 – 10.45 am Faculty: Mohanaradhya Max marks:50 Note : Answer any FIVE full questions 1.a) Explain the differences between ANSI C and ISO C++ with examples 6 b) Write a program in C to check whether a given system is ANSI C complaint or not. 4 2.a) What is an API ? How it is different
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closed source we can only see the code after it has been compiled into binary‚ or machine code‚ and only make changes that the programmers allow us to make within the OS. Open Sourced OS When we talk about open-sourced OS’ usually people think of UNIX or Linux. These are great examples of what open- source is. If a user wanted to download a version of Linux to install on his computer he could‚ and the open source would not cost him a thing. What he may end up paying for is support. Or if he is an
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QCS604 Operating Systems MCQz solved‚ by Miss Kazmi. http://vustudents.ning.com Bounded Buffer is a buffer of ____________ size Variable Fixed P/41 ___________ is also called Swapper. Long term Short term Medium term Swap space Shared libraries and kernel modules are stored in _____________ directory. /bin /dev /boot /lib P/23 P/34 __________ displays information about the top processes. Is Cs Top Cd Cooperating processes never share any data‚ code‚ memory or state. True False P/2
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monumental computing development. DOS had been bought from a Seattle hacker by Bill Gates‚ for a sum of $50‚000 a small price for an operating system that had managed sneak its way across the globe due to a clever marketing strategy. Apple’s OS and UNIX were both available‚ though the cost of running either was far greater than that of running DOS. Enter MINIX‚ an operating system developed from the ground up by Andrew S. Tanenbaum‚ a college professor. MINIX was part of a lesson plan used to teach
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Kaashoek‚ Morris Chapter 7 File system data structures The disk driver and buffer cache (Chapter 6) provide safe‚ synchronized access to disk blocks. Individual blocks are still a very low-level interface‚ too raw for most programs. Xv6‚ following Unix‚ provides a hierarchical file system that allows programs to treat storage as a tree of named files‚ each containing a variable length sequence of bytes. The file system is implemented in four layers: ------------pathnames ------------directories ------------inodes
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control every interaction on the software of the system. Standard UNIX permissions are still present‚ and are consulted before the SELinux policy during access attempts. When the standard file permissions allow access‚ the SELinux policy will be consulted and access is either gained or denied based on security of the source process and the targeted object. The chroot system call was introduced during development of Version 7 Unix in 1979‚ and added to BSD by Bill Joy on 18 March 1982 – 17 months
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How does computer software and hardware work together? This is kind of a complex question. I think the most important thing connecting software and hardware would probably be the register. Commands or services requested by the software are encoded into binary values of 0’s and 1’s and are written into a register. For example‚ some register may hold a value of "01101100". This encoding has a total of 8 bits. Each value of either 0 or 1 is called a bit‚ and 8 bits are called a byte. At the hardware
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redistribute modified versions under the same terms and licensing as the previous user. Question 4: The Free Software Foundation is a non-profit organization that promotes user freedom and defends free software users. GNU is a free Unix-like system which stands for “GNU is Not Unix”. GNU contains all of the official GNU software as well as non-GNU free software where it is not limited to only what is available in one software suite but users can select different packages according what they need. Linux
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