What are system calls?

• #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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• 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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