Answer Posted / sasidhar

fork internally calls sys_fork() where sys_fork() calls do_fork().

sys_fork() do the following functions
-> calls do_fork()
-> return PID

do_fork() does the following functions
-> creates a new process
-> Assign a new PCB
-> copies PCB of parent to new PCB with little bit changes in context.
-> return

so if any process calls fork() two number of returns occur and after returning from do_fork() to sys_fork(). sys_fork decides what value to be returned to parent process and child process

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