Answer / 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

Answer / bhushan bachhav

Linux implements fork() via the clone() system call.
The clone() system call, in turn, calls do_fork().
The bulk of the work in forking is handled by do_fork(),
which is defined in kernel/fork.c.This function calls
copy_process() and then starts the process running.
If copy_process() returns successfully, the new child is
woken up and run. Deliberately, the kernel runs the child
process first.

Answer / vikash

It calls clone function

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