fork() and exec() System Calls

Operating System: fork() and exec() System Calls
Topics discussed:
1) fork() System Call.
2) exec() System Call.
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Music:
Axol x Alex Skrindo - You [NCS Release]
#OperatingSystemByNeso #os #OperatingSystem #fork() #exec()

[@xrafter]

exec : execute a binary file and push arguments in. The stack
Fork : used to eat food

[@nikolaoschairopoulos9005]

EXCELLENT EXPLANATION ( hello from national technical university of Athens - Greece)

[@fahadxxdbl]

hello from the University of Leeds - England
(guys write your universities here too =D )

[@richardsinclair7661]

Hello from the University of Texas Rio Grande Valley - United States!

[@jaimecoloma6034]

Hello from the Pontifical Catholic University of Chile!

[@jameshunt1822]

Hello from Centre for Advanced Computing, Pune, Indua

[@cse080chandrasekhar9]

hlo from MITS

[@narasimhann2814]

The Best Explanation for fork() and exec() I ever saw. Hats off Sir !!

[@Giurigi123]

Truee

[@masakusapele8405]

You are all I needed. Thank you for this insightful and well explained lesson about fork() and exec()

[@adrianharo6586]

My favorite explanation of fork and exec calls, thank you.

[@ulfinawakjira1977]

Thank you very much you're helping many computer science students get through college!!

[@shaiksoofi3741]

Sir it's🔥🔥🔥🔥..U are simply awesome..Why can't we find a professor like u in colleges???🙍🙍

[@aniket7512]

Cuz clg profs are paid and hence no value.😅
.
I would love to pay my clg fees to NesoAcademy!😍

[@Amir-tv4nn]

It's because anyone can find other simple examples and just redo them on youtube. I'm glad he is not a professor lol. did anyone understand what he did with the arguments he created and passed into execv(). lmao ignorants

[@PersonofInterest23621]

@@Amir-tv4nn ah I see a triggered professor (or maybe a child of a professor). Either way, yeah we got it. He explains better than paid professors. Who are mostly slackers.

[@conceptgraduation694]

Same doubt

[@thanioruvan4556]

May be you are in a college which is in lower tier. Like in any other organizations, there are good professors employed in good tier 1 institutions as they are payed decently. As the institution level goes down, professor's skill also compromised. Better to study well, crack entrances and get in to top institutes.

[@bluechacha]

Very straight and clear explanation with simple example.

[@HelloWorldTrip]

Thank you for the explaining why PID was printed two times !

[@saadmanahmed860]

illustration with the mint terminal was extremely helpful. thanks for such great illustration

[@anaruzzzzzz]

Thank you! great explanation

[@followying392]

I got this, lessons on my class created the fear on me !
Thank you !

[@lakshminarayanans9252]

Because of your c programming video today I have clear the 1st round of ZOHO... Really thank you sir

[@Amir-tv4nn]

did you understand why he created the array of arguments and passed them into the function? lmao

[@randomguy4738]

@@Amir-tv4nn No... Still alot more helpful tutorial than what I was searching through though...

[@sergiosierraarquero3133]

Quite useful as usual, many thanks sir!!

[@kasaneshmeshesha3933]

Thank you for your good and simple explanation.

[@kawhao3757]

you are EXPLAIN clearly than my teachers , Thanks a lot sir.

[@a-87shreyashajaychoudhary28]

Neso Academy is doing a great JOB!!

[@leeyeonseo6600]

Thanks a lot, this is the best explanation of exec and fork that i found.

[@gufengmsa]

very clean instruction. Thank you

[@user-zq9qo3sm4q]

Awesome videos! Thank you so much!

[@ahmedabdulrazzaq2015]

Thank you great explanation!

[@ujjwalsharma9943]

goood job guys kudos to your content .....keep uploading informative videos

[@stevanvieira3665]

Thanks, this explanation was very clear! 😄

[@manshushivam295]

hats off for showing thing practically ...really its redefining learning

[@ardaaltntas9500]

After listening my proffesor`s meaningless and not understandable 3 hour fork() and exec() lessons, this video brings me to the moon man. Totally understand in

[@quratraja7391]

Thank You!
So, fork() function creates a duplicate copy of the same program with different process id. The process who calls fork() is called parent process while the newly created process with exactly same contents and different process is called child process.
Whereas exec() function is called with some argument by an already existing process. It replaces the existing process with the one referenced in argument. So the whole process is replaced by another with same process id of the older process. In fork (), process id changes while in exec(), process id remains the same. Fork produces duplicate while exec replaces the program.

[@xrafter]

Yes fork and exec are the most used syscalls in unix .
You always use them the shell always use them
exec is to execute a binary file

[@prantobhoumik6586]

if exec() function replace the whole content of running program then why the frist printf line execute which is written before the exec() function call

[@ssc_-kn6os]

@@prantobhoumik6586
After exec() is called with ex2 as argument then the whole ex2 program will be replaced from that line and the process will not return back to ex1
And
Before exec() whatever is written will obviously will get executed

[@NitinSatish]

Thank you for the superb explanation

[@saddamahmad2310]

thank you very much sir for this video

[@raffayylsamuill9164]

Thank you for this great explanation.

[@saraswati558]

I can't believe I finally got this

[@niranjankannan1248]

Excellent explanation Thanks

[@ganeshtarun2421]

Excellent explanation!!!!!

[@JasmineJas-kv4fl]

Thank you ur explaining everything detaily

[@hafsazaman367]

thank u sooooo much sir.....you are the best teaher ever

[@sakibchonka4005]

great content... hats off!!

[@shwetakapse8510]

Best explanation ...Thank u sirr👍

[@filosofiadetalhista]

You are an amazing teacher.

[@dnyaneshbachhav9772]

Awesome Explanation...!!!

[@vanidixit3894]

best explanation ever.
thank you

[@mustafaadel8194]

thanks alot bro, god bless you

[@sefrofchan430]

Thanks a lot sir!😊

[@ismail8973]

Thanks sir
with respect from NIT Calicut

[@venkataswamykadiyam977]

Excellent explanation sir

[@bryanshi3774]

super clear explanation

[@NoOne-lj3zb]

All time favorite @ neso academy ❤️

[@cherryson4625]

The best video in the whole youtube...

[@user-mw8ci2qc8x]

Thank you sir. You are explaining every thing in a great way thank you very much.

[@PepeBote11a]

amazing explanation you saved me

[@zainie1081]

u saved my grade man, thank you

[@rahuljain224]

Very nice explanation ❤

[@user-ul7nb8qs5x]

Man, You are the best!

[@binateaaghar9507]

thank u !!! its too much very helpful😇

[@soult7849]

Thanks you are way better than my professor.

[@DolaLado]

Thank you.

[@turzosaha3789]

very informative lecture

[@dharmikmistry8781]

Thank you sir 🤗🤗🤗

[@manoranjani5673]

woww... amazing explanation....

[@ashokmahajan6062]

Can you please explain why the first program using fork() won't go into infinite loop ?

[@sto2779]

Good explanation.

[@ghita2003able]

amazing explanation

[@dheerajpawar211]

Thank you so much ❤️

[@mos3ab696]

Thanks bro, it's very awesome 🥰

[@subee128]

Thank you so much

[@haanhtran9351]

thank you so much!

[@nicholaswoel-nogueira4074]

what are those quotes on the cow. Lowkey love it

[@ericfeng8226]

This is really good

[@khadija6918]

really good!

[@nishitpandit7620]

Great explanation as always although I couldn't understand why during the multiple forking example you explained, the 2nd last output statement included the terminal header('jaison@neso-acdemy.....')?

[@harryporter3116]

This is very late, but in case anyone is still wondering my assumption is that the initial process returned before all children finished, since they're all executing concurrently. So the shell prints the next prompt whilst a few child processes are still executing. You'll see some of the prints are out of order for a similar reason. I could be wrong though, so if anyone knows better please feel free to correct me.

[@nicolagigante980]

If my college professors explained programming concepts like you do, many students would finish their degrees instead of dropping out!

[@ayushiyadav1]

agree...💯

[@ogujohnkennedy9121]

Awesome, thanks

[@samarthtandale9121]

Great Video !!!

[@narendraparmar1631]

thanks sir

[@farahmohamed2104]

well explained

[@yashwanths2782]

Thank you

[@domulko44]

thanks it helped

[@amanchaudhary8817]

Great sir 👏

[@anonymous.reddy0]

Thnaks

[@laharibasu9731]

Awesome practical explanation.😇❤️

[@rajbhardwaj2180]

Could u help me in numerical?

[@sagar00108]

@@rajbhardwaj2180 I will

[@Ravi_477]

What an explanation .

[@dhanushsivajaya1356]

Thankyou sir

[@VinayakMahadev11]

Any idea about what is the use of args in the execv() function?

[@malwa-ka-kisan]

Very nice🙏🙏

[@play_sports_and_read_books]

Why did you write args?
What was it used for?

[@feiseyouto]

What a hero

[@mohammedkhalid1648]

I got full mark in the quiz cuz of you TYSM

[@suryar3173]

In exec, Which system call is used in second program to get back to the first program?

[@chandumadhumanthi9983]

why should i create duplicate process, what is the use of it.

[@Giurigi123]

Very ueeful

[@saadmanahmed860]

dear neso academy u just explained it so nicely

[@That_EvilGuy]

Dam longer video then expected but it's better explained than expected XD

[@tomasmelo3194]

and how do i go back to ex1.c in that example?

[@devtoro5601]

ThankS!

[@asimkhan6993]

great explanation ...thank you sir

[@ifthikarali6741]

good one

[@maan9626]

now I understand that shit after wasted 1 hr of my life. thanks bro

[@smrititilak]

What was the purpose of passing the args array to exec?

[@kyubae8351]

You pass an vector environment that the new process can use.
For example when the first process makes a calculation that you need the result of in the other process, you just pass the result inside that vector environment

[@ayushiyadav1]

19:46 yesss, clear. 😊❤

[@haowenwei3256]

Sooooooooooooooooooooooooooooooo goooooooooooooooooooooood!

[@user-hd9hg5ls7e]

Why we generally write shell program?? What is its need??

[@ShubhamHarikrishna]

nice video