5.12 Input and Output

• Ports: The idea of the port abstraction.
• Reading: Procedures for reading from a port.
• Writing: Procedures for writing to a port.
• Closing: Procedures to close a port.
• Random Access: Moving around a random access port.
• Line/Delimited: Read and write lines or delimited text.
• Block Reading and Writing: Reading and writing blocks of text.
• Default Ports: Defaults for input, output and errors.
• Port Types: Types of port and how to make them.
• I/O Extensions: Using and extending ports in C.