Answer Posted / md.afzal khan

Include directory is special directory which content all the
header files of c language. Extension of header files in c
language is header. All header files only keep declaration of
functions, declaration of data type and micro constants. Body
of function i.e. function definition is not written in the
header files. Hence no one can get source code of function
like printf, clrscr etc. All the function declaration in
header file is extern. Since visibility of extern data type is
whole the program. and other file can also access such
function. Body of function of header file is supplied at the
time of linking in header file.

The OS is a program that uses various data structures. Like all programs in execution, you can determine the performance and other behavior of the OS by inspecting its state - the values stored in its data structures. In this part of the assignment, we study some aspects of the organization and behavior of a Linux system by observing values of kernel data structures exposed through the /proc virtual file system. The /proc virtual file system: Linux uses the /proc file system to collect information from kernel data structures. The /proc implementation provided with Linux can read many different kernel data structures. If you cd to /proc on a Linux machine, you will see a number of files and directories at that location. Files in this directory subtree each corresponds to some kernel data structure. The subdirectories with numeric names contain virtual files with information about the process whose process ID is the same as the directory name. Files in /proc can be read like ordinary ASCII files. You can open each file and read it using library routines such as fgets() or fscanf(). The proc (5) manual page explains the virtual files and their content available through the /proc file system. Requirements in detail: In this part, you are asked to write a program to report the behavior of the Linux kernel. Your program should run in two different versions. The default version should print the following values on stdout: • Processor type • Kernel version • The amount of memory configured into this computer • Amount of time since the system was last booted A second version of the program should run continuously and print lists of the following dynamic values (each value in the lists is the average over a specified interval): • The percentage of time the processor(s) spend in user mode, system mode, and the percentage of time the processor(s) are idle • The amount and percentage of available (or free) memory • The rate (number of sectors per second) of disk read/write in the system • The rate (number per second) of context switches in the kernel • The rate (number per second) of process creations in the system If your program (compiled executable) is called proc_parse, running it without any parameter should print out information required for the first version. Running it with two parameters "proc_parse " should print out information required for the second version. read_rate represents the time interval between two consecutive reads on the /proc file system. printout_rate indicates the time interval over which the average values should be calculated. Both read_rate and printout_rate are in seconds. For instance, proc_parse 2 60 should read kernel data structures once every two seconds. It should then print out averaged kernel statistics once a minute (average of 30 samples). The second version of your program doesn't need to terminate.

4317

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How are portions of a program disabled in demo versions?

742

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What are the disadvantages of external storage class?

584

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how can i access hard disk address(physical address)? are we access hard disk by using far,near or huge pointer? if yes then please explain.....

1366

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Tell me what is null pointer in c?

608

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Write a code on reverse string and its complexity.

602

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application areas a 'c' a) operating system b) graphics, interpreter, assembler c) program evalution, communication softwares d) all the above

599

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i have to apply for rbi before that i need to know the the syllabus for the entrance questions. whethet it may be aps or techinical

1836

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provide an example of the Group by clause, when would you use this clause

1704

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Why is structure important for a child?

601

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what is event driven software and what is procedural driven software?

2005

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What is c language used for?

553

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What's the best way of making my program efficient?

620

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4-Take two sets of 5 numbers from user in two arrays. Sort array 1 in ascending and array 2 in descending order. Perform sorting by passing array to a function mySort(array, sortingOrder). Then multiply both the arrays returned from function, using metric multiplication technique in main. Print result in metric format.

1721

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What is header file in c?

597

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