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What do fork() internally call?
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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
| Is This Answer Correct ? | 3 Yes | 0 No |
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.
| Is This Answer Correct ? | 4 Yes | 3 No |
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