Input/Output, I/O

Input/Output, I/O is the process of copying data between main memory and external devices such as disk drivers, terminals, and networks.

An input operation copies data from an I/O device to main memory.

An output operation copies data from memory to a device.

Two-Level

• Standard I/O (Bufferred I/O)
• UNIX I/O (System-level I/O)

Operation

• open
• close
• read
• write
• seek