Description
Write a C program for UNIX that creates three processes, a grandparent (G), a parent (P) and a child (C). The first process is the grandparent G, which creates the process P (the parent) and then waits until P finishes its execution. Process P in turn, will create the child process C and waits until C finishes its execution. More precisely, the following list describes the behavior of each process:
1. Process G will create process P, will wait for process P to finish its execution, and then will display its own pid.
2. Process P will create process C, will wait for process C to finish its execution, and then will display its own pid and the pid of process G (its parent).
3. Process C will display its own pid, the pid of process P (its parent) and the pid of process G (its grandparent)
When run, the program will display the following (where X, Y, Z are numbers representing process ids):
I am the child process C and my pid is X. My parent P has pid Y. My grandparent G has pid Z.
I am the parent process P and my pid is Y. My parent G has pid Z.
I am the grandparent process G and my pid is Z.
