What are system calls? Explain any five system calls.
|Open()||A program initializes access to a file in a file system using the open system call.|
|Read()||A program that needs to access data from a file stored in a file system uses the read system call.|
|Write()||It writes data from a buffer declared by the user to a given device, maybe a file. This is primary way to output data from a program by directly using a system call.|
|Exec()||exec is a functionality of an operating system that runs an executable file in the context of an already existing process, replacing the previous executable|
|Fork()||fork is an operation whereby a process creates a copy of itself. Fork is the primary method of process creation on Unix-like operating systems.|