I want to write a c program in linux or windows environment(I m not sure about t

Question

I want to write a c program in linux or windows environment(I m not sure about this)

And in this program C language program will extend the Linux Kernel

implementation and extract the number of Voluntary Context Switches and Involuntary

Context Switches of a process.

This program will print these values

Pid : 123

nr_voluntary_switches : 10

nr_involuntary_switches : 12

and in this program we have do our implementation and we cannot use any c function or any linux command

I m trying to write this program but could not succeed yet

#include<time.h>

#include<sched.h>

#include<iostream.h>

void main()

{

struct rusage{

long ru_maxrss;

long ru_ixrss;

long ru_idrss;

long ru_isrss;

long ru_minflt;

long ru_majflt;

long ru_nswap;

long ru_inblock;

long ru_oublock;

long ru_insgsnd;

long ru_msgrcv;

long ru_nsignals;

long ru_nvcsw;

long ru_nivcsw;

};

cout<<"a"<<rusage->nvcsw;

}

I have to modify the kernel files as well, there are some hints about this program which I m not getting

(Hint: getrusage() system call provides the system resource information of a process in struct

named task_struct, to get desired values, modify this struct along with INIT_TASK macro;

both are available in sched.h )

Explanation / Answer

#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include <sys/time.h>
#include <sys/resource.h>

int main(int argc, char *argv[]) {
struct rusage ru;
getrusage(RUSAGE_SELF, &ru);
   printf(" voluntary context switches %ld,involuntary context switches %ld ", ru.ru_nvcsw,ru.ru_nivcsw)
return 0;
}

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