Explain the fork function, Operating System

Assignment Help:

Explain the Fork Function

Fork function causes a new process to be created. The calling progress is duplicated as an exact copy (called the child process) that differs only in process IDs and parent IDs. This function returns the chid's process ID to the parent process and a value of 0 to the child process. After that it is possible to distinguish the two process as a result to the fork () call. The child inherits many handles, IDs, and masks from the parent process. The fork is generally used in conjunction with exec () to load or spawn new process. First the fork is initiated to create a new process context, then exec () is used to overlay the child process with a new executable image. execl(execName, arg0,....) The exec family of functions changes the state of the calling process into a new process.

Once executed, exec will replace the currently executing process with one specified by execName. Optionally parameters may be passed to  the newly running process as variable-number command line arguments (arg0....)  This function is usually used to either replace or overlay  an existing running process or in conjunction with the fork () system call to initiate a new process. Once the fork () call is initiated to copy the process, the child process may in turn exec the new process to be executed. The original process is thus still in memory and active, and the child process has become a new executable image specified by exec Name.


Related Discussions:- Explain the fork function

Explain about paging, Explain about paging? Answer: Paging is a memory-...

Explain about paging? Answer: Paging is a memory-management scheme that permits the physical-address space of process to be noncontiguous. Paging avoids the considerable proble

Explain the concept of mutual exclusion, Question 1: (a) Discuss about...

Question 1: (a) Discuss about the evolution of operating systems from mainframe batch systems to mainframe time sharing systems. (b) Explain your understanding of the "sus

Information system, using the transformation process model and system think...

using the transformation process model and system thinking concepts explain the key operation of TGL works.

What is page fault?, What is page fault? In the computer storage techno...

What is page fault? In the computer storage technology a page fault is an exception which is raised by the memory management unit when a requested page isn't mapped in physical

Banker''s algorithm, Consider the following snapshot of a system, answer th...

Consider the following snapshot of a system, answer the following questions using the banker's algorithm: 1. What is the content of the matrix Need? Is the system in a safe stat

Describe the concept of transaction atomicity, Q. Describe the concept of t...

Q. Describe the concept of transaction atomicity? Answer: A transaction is a sequence of read as well as writes operations upon some data followed by a commit operation. If the

Define i/o and cpu bursts, Define I/O and CPU Bursts   Applications typ...

Define I/O and CPU Bursts   Applications typically to through cycle of CPU bursts and Input/output bursts. Since the CPU sits idle during I/O operations, efficiency is improved

Essential properties of operating system, Essential Properties of Operating...

Essential Properties of Operating System 1. Batch: Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequen

Management Information Systems, Select any business process within this fir...

Select any business process within this firm, describe it as a set of steps then fill the following table (flow, information, sender and receivern #Minimum 100 words accepted#

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd