Program to generate and print Fibonacci series 

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  • Parent program should create a child and distribute the task of generating Fibonacci no to its child.
  • The code for generating Fibonacci no. should reside in different program.
  • Child should write the generated Fibonacci sequence to a shared memory.
  • Parent process has to print by retrieving the Fibonacci sequence from the shared memory. i) Implement the above using shm_open and mmap Note: Shared object should be removed at the end in the program
/////////////////////////////////////////parenrt////////////////////////////////////////
//Include -lrt while compiling

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <fcntl.h>

void main(){
	int fd, n;
	int buffer[25];
	int *shared_memory;
	
	fd = shm_open("chandan",O_CREAT|O_RDWR, 0666);
	ftruncate(fd,1024); //allocating 1024 bytes of memory to shared memory
	shared_memory = (int*)mmap(NULL, 1024, PROT_WRITE, MAP_SHARED, fd, 0);
	
	printf("Enter n>> ");
	scanf("%d",&n);
	char nstr[20];
	sprintf(nstr, "%d", n);
	
	if (fork()==0){
		execlp("./child","child",nstr,NULL);
	}
	else{
		wait(NULL);
		
		for(int i=0;i<n;i++){
			printf("%d ",shared_memory[i]);
		}
		printf("\n");
		
		shm_unlink("chandan");
	
	}
}
///////////////////////////////////////////child////////////////////////////////////////

/Include -lrt while compiling

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <fcntl.h>

void main(){
	int fd, n;
	int buffer[25];
	int *shared_memory;
	
	fd = shm_open("chandan",O_CREAT|O_RDWR, 0666);
	ftruncate(fd,1024); //allocating 1024 bytes of memory to shared memory
	shared_memory = (int*)mmap(NULL, 1024, PROT_WRITE, MAP_SHARED, fd, 0);
	
	printf("Enter n>> ");
	scanf("%d",&n);
	char nstr[20];
	sprintf(nstr, "%d", n);
	
	if (fork()==0){
		execlp("./child","child",nstr,NULL);
	}
	else{
		wait(NULL);
		
		for(int i=0;i<n;i++){
			printf("%d ",shared_memory[i]);
		}
		printf("\n");
		
		shm_unlink("chandan");
	
	}
}