Interface provided for accessing services provided by Operating System - system calls

Q.  Operating System provides the different types of services to the user. For accessing these services, the interface is provided by the
- Published on 17 Jun 15

a. system calls.
b. Application Programming Interface.
c. Native library.
d. None of the above.

ANSWER: system calls.

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    Discussion

  • Nirja Shah   -Posted on 25 Nov 15
    System call
    - It is how a program requests a service from an operating system's kernel.

    - It includes the hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling.

    - It provides an essential interface between a process and the operating system.

    - In most systems, they are possible to be made only from userspace processes, while in some systems, OS/360 and successors for example, privileged system code also issues system calls.

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