Linux-Process-API-fork-wait-exec-

Ex02-Linux Process API-fork(), wait(), exec()

Ex02-OS-Linux-Process API - fork(), wait(), exec()

Operating systems Lab exercise

AIM:

To write C Program that uses Linux Process API - fork(), wait(), exec()

DESIGN STEPS:

Step 1:

Navigate to any Linux environment installed on the system or installed inside a virtual environment like virtual box/vmware or online linux JSLinux (https://bellard.org/jslinux/vm.html?url=alpine-x86.cfg&mem=192) or docker.

Step 2:

Write the C Program using Linux Process API - fork(), wait(), exec()

Step 3:

Test the C Program for the desired output.

PROGRAM:

C Program to create new process using Linux API system calls fork() and getpid() , getppid() and to print process ID and parent Process ID using Linux API system calls

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main(void)
{	
	pid_t process_id;
	pid_t p_process_id;
	process_id = getpid();
	p_process_id = getppid();
	printf("The process id: %d\n",process_id);
	printf("The process id of parent function: %d\n",p_process_id);
	return 0; }

##OUTPUT

C Program to execute Linux system commands using Linux API system calls exec() , exit() , wait() family

#include <stdlib.h>
#include <sys/wait.h>
#include<stdio.h>
#include<unistd.h>
#include <sys/types.h>
int main()
{ int pid; 
pid=fork(); 
if(pid == 0) 
{ printf("Iam child my pid is %d\n",getpid()); 
printf("My parent pid is:%d\n",getppid()); 
exit(0); } 
else{ 
printf("I am parent, my pid is %d\n",getpid()); 
sleep(100); 
exit(0);} 

##OUTPUT

RESULT:

The programs are executed successfully.