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:

PROGRAM: Developed by : JASSIR SULTHAN Register Number : 212224240060

C Program 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)
{
//variable to store calling function's process id
pid_t process_id;
//variable to store parent function's process id
pid_t p_process_id;
//getpid() - will return process id of calling function
process_id = getpid();
//getppid() - will return process id of parent function
p_process_id = getppid();
//printing the process ids
//printing the process ids
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 create new process using Linux API systemcalls fork() and exit()

 #include <stdio.h>
 #include<stdlib.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

C Program to execute Linux system commands usingLinux API system calls exec() family

 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 int main()
 {
 printf("Running ps with execlp\n");
 execlp("ps", "ps", "ax", NULL);
 printf("Done.\n");
 exit(0);
 }

OUTPUT

RESULT:

The programs are executed successfully.