OS lab2

OS Lab2

//Aim:fork() system call basic

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>

int main()
{
    pid_t pid;
    pid=fork();


    pid=fork();
    printf("\nHello World %d",getpid());

    return 0;
}


//fork() with if condition


#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>

int main()
{
    pid_t pid;
    pid=fork();

    if(pid==0)
    {
      printf("\nnew process of child with id: %d and Parent: %d\n",getpid(),getppid());
    }
    else
    {
        printf("\nparent with id: %d\n",getpid());
    }

    return 0;
}


//Panning

#include  <stdio.h>
#include  <stdlib.h>
#include  <sys/types.h>



void  main(void)
{
     pid_t  pid;

     int n,i;

    printf("Enter no of child :");
    scanf("%d",&n);

        printf("\n Parent is %d ",getpid());
    for(i=0;i<n;i++)
    {
        pid=fork();

        if(pid==0)
        {
            printf("\n Child Created %d  with %d Parent \n",getpid(),getppid());
            exit(0);
        }
        else
        {
            wait();
            continue;
        }
    }


}


//chaining

#include  <stdio.h>
#include  <string.h>
#include  <sys/types.h>



void  main(void)
{
     pid_t  pid;

     int n,i;

    printf("Enter no of child :");
    scanf("%d",&n);

    printf("\n Parent is %d ",getpid());
    pid=fork();

    for(i=0;i<n;i++)
    {

        if(pid==0)
        {
            printf("\n Child Created %d  with %d Parent \n",getpid(),getppid());
            pid=fork();
            wait();
        }
        else
        {
            wait();
            continue;
        }
    }


}