About fork() return value:This slide said fork command return an integer. In my understanding, both parent and child processes are running concurrently after this code. So, why the slide said "running in newly created child process" when the return value =0?Does it mean that the child process is not running when the return value>0? It said "running in parent process" when the return value>0. Process Creation (Cont.)I fork () System call creates a copy of current process with a new pidI The return value from fork()- two integer values, one for parent, one forchild• When > 0:• Running in (original) parent process• The return value (positive integer) is pid of newly created child• When = 0:%3D• Running in newly created child process• When < 0: (When = -1)» Error! Must handle somehow» Running in original processAll state of original (parent) process duplicated in the child process• Memory, file descriptors, and etc.Because the child is a copy of the parent, each process has its own copyof any data.

Answered: So, why the slide said "running in…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

About fork() return value: This slide said fork command return an integer. In my understanding, both parent and child processes are running concurrently after this code. So, why the slide said "running in newly created child process" when the return value =0? Does it mean that the child process is not running when the return value>0? It said "running in parent process" when the return value>0.

Process Creation (Cont.)
I fork () System call creates a copy of current process with a new pid
I The return value from fork()- two integer values, one for parent, one for
child
• When > 0:
• Running in (original) parent process
• The return value (positive integer) is pid of newly created child
• When = 0:
%3D
• Running in newly created child process
• When < 0: (When = -1)
» Error! Must handle somehow
» Running in original process
All state of original (parent) process duplicated in the child process
• Memory, file descriptors, and etc.
Because the child is a copy of the parent, each process has its own copy
of any data.

Expert Solution

Step 1

Explanation:-

Fork() System call is used to create a new process, known as the child process. The fork is an operation where a process creates a copy of itself. The new copy is called the 'child process' while the original one is said 'parent process'.

After the creation of the new process both the processes(parent process and the child process) runs concurrently. Parent process makes the fork() call. When the new process is created, both the process follows or executes the same instruction which follows the fork() system call.

The use of fork() is to create a new process only. The child process uses the same files, registers, and program counter as the parent process.Fork() System call returns the value without taking parameters.