Compile and run the program below. Complete the missing information in the diagr
ID: 3751136 • Letter: C
Question
Compile and run the program below. Complete the missing information in the diagram given after the code. Identify the parent process for P1. Identify the parent process for P2. What are the possible different outputs for this program? int main) int pid; pid = fork(); if (pid1) perror ( ERROR- fork In") exit (0) else if (pid0) printf("child process with pid %d, and Parent pid-: %d ", getpid, getppid)) sleep (5); printf("After sleeping. Child process with pid -, and Parent pid- %d ", getpid(), getppid()); exit (0); else printf ("Parent process with pid getpid, getppid)) printf ("Parent exiting nown"); exit (0) %d, and Parent pid-: %d ", return 0 P1 P2 PID PPID- Value Returned by fork()- PID- PPID- Value Returned by fork()- ForkExplanation / Answer
P1:
PID = Original process(parent process P1) process Id.
PPID = The process Id(pid) of the shell from which the program is executed.
Value returned by fork() = returns process id of child process(P2).
P2:
PID = The process id of child process(P2).
PPID = Process id of parent process(P1), if parent process exist when ppid is queried by getppid(). If parent process(P1) gets terminated before this, then PPID is 1(process id of Init process)
Value returned by fork() = 0 is returned by fork() in child process.
Different possible outputs:
1. Parent process with pid = 5 and Parent pid = 4
Child process with pid = 6 and Parent pid = 1.
In this case parent process gets terminated before child process. Hence child process becomes orphan and get adopted by Init process(process pid =1). Hence Init process becomes parent process for this child process.
2.
Parent process with pid = 5 and Parent pid = 4
Child process with pid = 6 and Parent pid = 5.
Before the parent process's termination, child process get executed and terminated. Hence outputting the calling process's(parent process pid=5) pid for parent pid.
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