SYSTEM CALLS IN OPERATING SYSTEM || WORKING OF SYSTEM CALLS IN OS || NEED OF SYSTEM CALLS IN OS

SYSTEM CALLS
1) Provides services of OS to the user program via API (Application Program Interface)
2) When a process in user mode requires access to resource then it requests the kernel to provide the resource via system call
3) System calls are the only entry points into kernel system
4) System call is an interface between applications/processes and Kernel.
WORKING OF SYSTEM CALL
Step 1: The processor executes a process in the user space until a system call interrupts it.
Step 2: Then on a priority basis, the system call is executed in the kernel space.
Step 3: After the completion of system call execution, control returns to user space.
Step 4: The execution resumes in Kernel space.
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OPERATING SYSTEM
• OPERATING SYSTEM
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Instagram : / sundeepsaradhikanthety

[@gaspatweve5606]

You made me understand very fast and in simple way bravoo sir

[@KarunaYarraguntla]

Explanation is good but a small correction API means Application Programming Interface

[@Bunty__]

Hmm 👍

[@Rojgarchek]

Program in execution is also called process.

[@mahekvaja1131]

Thank you so much sir... My exam is after 2 days.. I wish I could have found your channel earlier...

[@satyajhansivelnati3802]

Magnificent explanation....... 👏👏👏

[@RPVlogs0729]

Thank you...understood... well explained

[@kavimalaibagavathi7802]

Very useful sir👍

[@pankajbankar5857]

Great Explain

[@ganeshjaggineni4097]

NICE SUPER EXCELLENT MOTIVATED

[@sahithinaidu5624]

nice explanation

[@Bad_Gamerz666]

Thank you for explanation

[@mukundayadhav3845]

Awesome...this is enough to write an exam....

[@cksplayme5422]

😂😂and thatswhy iam sitting one day before exam

[@rohithrohith6008]

Super sir usefull

[@hamshihamsu5461]

Thank you so much Sir

[@venkatanarayanamca1812]

Api stands for Application Programming Interface

[@indianentertainment2718]

Thank you 👍 sir

[@geethag4294]

What is multi mode operation of Os? Sir can you also explain timer in os

[@hamshihamsu5461]

Sir how would be the hardware interact with the kernal how it interuput with kernal

[@haithamnassir3867]

Is the user space RAM and the kernel ROM?

[@devilplayshuntz]

SUPER RA ANNA

[@shoaibtufail4355]

Excellent 😊

[@nidamaqbool7849]

thanks sir

[@sachithkasa3811]

how does the kernel knows which system call the application is requesting

[@user-wv2pb6mm6q]

What is kernel

[@avengersgaming9997]

op boltea

[@romeondlovu4624]

nothing much to say - still new in this industry

[@tastyseconds2023]

Tq

[@navajyothputalath9457]

sir what about context switch?

[@Dipanwita_Deb2048]

Watching 1day before exam is permanent 😂❤

[@debasishnayak4468]

When The process will create a system call,is it call interrupt??
Bcoz I know interrupt generated by hw where as trap generated by user program.
Plz explain any one...

[@likhithareddy445]

Trap is generate when there is error in the program ..
interrupt is generated by hardware .. system call are also interrupt but generated by software

[@pruthviraj6347]

Legend study before 2 hours

[@narayanasamy505]

Whether This explanation is enough to write in exam??

[@kaichousan8626]

out of 10 marks nope. You need to write essay to win 8/10

[@user-kr7ph8tp6s]

Tomorrow os sem exam