System calls allow computer programs to request services from the operating system kernel. They are generally implemented as routines in languages like C and C++. Major categories of system calls include process control, file manipulation, device management, information maintenance, and communication.

1. SYSTEM CALLS
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SV COLLEGE OF ENGINEERING
KADAPA
MURALI NANABALA SVCE KADAPA CSE DEPT

2. KERNAL
MODE
PRIVILIZED MODE
@System call is the programmatic way in which a computer
program requests a service from the kernel of the
operating system.
@These call are generally available as routines written
in c and c++.
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3. ACQUIRE INPUT FILE NAME
WRITE PROMPT TO SCREEN
ACCEPT INPUT
ACQUIR OUTPUT FILE NAME
WRITE PROMPT TO SCREEN
ACCEPT INPUT
OPEN INPUT FILE
IF FILE DOESN’T EXISTS ,ABART
CREATE OUTPUT FILE
IF FILE EXISTS,ABART
READ FROM INPUT FILE
WRITE TO OUTPUT FILE
CLOSE OUTPUT FILE
WRITE COMPLETE MESSAGE ON SCREEN
TERMINATE NORMALLY
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4. 1.Process control
2.File manipulation
3.Device management
4.Information maintenance
5.communication
Major groups of system calls
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