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System calls works as a mediator between user program and service provided by operating system. In actual situation, functions that make up an API (application program interface) typically invoke the actual system calls on behalf of the application programmer.
Types of System Calls
System calls can be grouped roughly into five major categories:
Sr No. Example 1 Process control Create process, terminate process, end, allocate and free memory etc 2 File manipulation Create file, delete file, open file, close file, read, write. 3 Device manipulation request device, release device, read, write, reposition, get device attributes, set device attributes etc. 4 Information maintenance get or set process, file, or device attributes 5 Communications Send, receive messages, transfer status information
