when a process is created using fork(). what is shared between parent process

when a process is created using fork(). what is shared
between parent process and child process.
1.Heap 2. stack 3. shared memory segments 4. I/O handles

Question Posted / minakshi

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when a process is created using fork(). what is shared between parent process and child process. ..

Answer / sushil kumar

(3)shared memory segments
reason:-When a fork() system call is issued, a copy of all
the pages corresponding to the parent process is created,
loaded into a separate memory location by the OS for the
child process.

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43 Yes

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when a process is created using fork(). what is shared between parent process and child process. ..

Answer / pradeep

this is correct but partially. there is something called COW(copy on write). stack is not copied until one of them(parent or child) tries to write into it. if the child immediately calls exec then there is not need to copy the stack at all. As practically in most of the cases child process does an exec call, this unnecessary copy of huge stack is avoided by delaying it till its written into.

Is This Answer Correct ?

12 Yes

3 No

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