Question

In this assignment you will be working with processes on the Linux platform. You will be programming in C or CH. Partl. Writhe a program prog that repeatedly creates a sub-process using fork(). And wait()s until it terminates. In particular, each child process displays "Child Running and calls exito immediately. Part2. Modify prog so that each child process spawns another program b using execve(). The program b, execute the kernel command Is and immediately exits.

Answer 1

Part 1 answer:

When a process uses fork(), it creates a duplicate copy of itself and this duplicates becomes the child of the process.

wait(NULL) : If you call wait(NULL) you only wait for any child to terminate.

C Code:

//Program starts..

#include<stdio.h>

#include <sys/wait.h> // for wait()

#include <unistd.h> // for fork()

#include <stdlib.h> //Exit()

/*When a process uses fork(), it creates a duplicate copy of itself and this duplicates becomes the child of the process.*/

int main()

{

for(int i=0;i<5;i++)

{

if(fork() == 0) //child process,FORK returns 0 to child process

{

printf("Child Running... Child pid %d from Parent pid %d\n",getpid(),getppid()); //Gets child process id and parent process id..

exit(0); //successful exit

}

else //parent process comes after calling fork..

{

// printf("parent \n");//Verification

wait(NULL);// parent is waiting for the child. Once child terminates, parent will get its exit status and can then continue

}

}

}

//End of program

As HOMEWORKLIB RULES rule, I have completed a part from the above question. Thanks in advance.