Operating System

Write short note on system call  ?

A system call is a programmatic way in which a computer program requests a service from the operating system on which it is executed. System calls provide an essential interface between a process and the operating system. They are the only way for a process to access the services provided by the kernel, such as file I/O, memory management, and process scheduling.

System calls are typically implemented as a set of functions that are exported by the kernel. When a process makes a system call, it traps into the kernel, which then executes the requested function. The kernel then returns to the process, passing back any results from the function.

There are many different types of system calls, but some of the most common include:

  • File I/O:
  • These system calls allow processes to read and write files, as well as to create, delete, and open files.
  • Memory management:
  • These system calls allow processes to allocate and deallocate memory, as well as to map memory into their address space.
  • Process scheduling:
  • These system calls allow processes to create new processes, wait for child processes to terminate, and terminate themselves.
  • Device I/O:
  • These system calls allow processes to communicate with devices, such as printers and scanners.

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