Zombie process: The child process can be terminated without informing to parent process.
PPID: The PPID represents the parent of process id.
fd : The fd represents file descriptor.
#include <stdio.h>
main()
{
int pid ;
printf("I'am the original process with PID %d and PPID %d.\n",getpid(),getppid());
pid=fork();
if(pid!=0 )
{
printf("I'am the parent with PID %d and PPID %d.\n",getpid(),getppid());
printf("My child's PID is %d\n",pid) ;
}
else
{
sleep(4);
printf("I'm the child with PID %d and PPID %d.\n",getpid(), getppid()) ;
}
printf ("PID %d terminates.\n", getpid()) ;
}