please help with this c program for these system calls Write a C program for each of the following system calls (one per call) which uses thecall in a normal manner. Make sure that your program compiles and executes withouterror. Show the output from each of the programs.Please check for, and report, any errors. Terminate execution on error (do not continuerunning if a call fails).a) sbrkb) forkc) sched_getaffinityThe last one is a bit tricky. The main page has a lot of useful information on theparameters. The cpu_set_t is an opaque type: You are not meant to manipulate itdirectly. There are macros in sched.h which will set/clear/test members of the set. Theman page for CPU_SET(3) describes these. Of particular interest is CPU_ISSET.The number of cores can be found with sysconf(_SC_NJPROCESSORS_ONLN). Thisis the number of hyperthreads, not the number of raw cores. It is also the size of theCPU mask.#include #include int main(){long ncores = sysconf(_SC_NPROCESSORS_ONLN);printf ("%d cores found\n", ncores);}The CPU mask is a list of values which are either 1 or 0 depending on whether thegiven process is allowed to run on that logical core. You can iterate over possiblevalues:for (i = 0; i < ncores; i++){printf("%d ", CPU_ISSET(i, &mask));}

Step 1: a) sbrk : The sbrk system call is used to increment the program's data space. Here's a…

Answered: Write a C program for each of the…

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter6: User-defined Functions

Section: Chapter Questions

Problem 31SA

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Write an entire C program that reads a positive integer entered by a user and then prints out all the positive divisors of that integer in a column and in decreasing order. The program should allow the user to repeat this process as many times as the user likes. Initially, the program should inform the user about how the program will behave. Then the program should prompt the user for each integer that the user wishes to enter. The program may be terminated in any of two ways. One way is to have the program halt if the user enters an integer that's negative or zero. In this case, the user should be reminded with each prompt that the program can be terminated in that way. Alternatively, after an integer has been entered and the divisors have been printed, the program can ask the user whether he/she wishes to enter another integer. In this case, when the user accidentally enters a zero or negative integer to have its divisors calculated, the program should inform the user that the input…
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Computer Science A system call in an operating system is typically a function call that traps to the kernel. However, there are also library calls that are functions that do not directly trap into the kernel, but may invoke system calls that do. In MINIX, there is a corresponding library call read that always invokes the system call. In UNIX, there are also several other library calls---getc, fgetc, getchar, for example---that also input data. Describe the difference between the MINIX read library call and these functions. How do you think these functions (getc, fgetc, getchar) perform data input? Do they always need to ultimately trap to the kernel? Why or why not?
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