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(#M40030396) DBMS Programming question DBMS Keep an EYE

What are system calls?

Asked In DBMS MAN (11 years ago)

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Chandni Maurya  (11 years ago)

#System calls provide the interface between a running program and the operating system.
-> Generally available as assembly-language instructions.
-> Languages defined to replace assembly language for systems programming allow system calls to be made directly (e.g., C, C++).
#Three general methods are used to pass parameters between a running program and the operating system.
1. Pass parameters in registers.
2. Store the parameters in a table in memory, and the table address is passed as a parameter in a register.
3. Push (store) the parameters onto the stack by the program, and pop off the stack by operating system.
#Types of system calls
1.Process control
2.File management
3.Device management
4.Information maintenance
5.Communications

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Siva Tarun  (10 years ago)

A system call acts intermediate between user program and operating systems. It mainly helps a user program to get services which can be performed by operating System

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