Files And File Descriptors

Here we cover one of the most important concepts - file descriptors [1], and I/O. While a file on disk is by far not the only thing that one can do I/O on, we see how the open(2) system call is used to open and create files in many ways.

Contents

• File Descriptors: Basics
• open(): Opening Files
• Reading Files
• Writing Files
• Creating Files
• Duplicating (dup() And Friends)
• File Position/Offset
• Miscellaneous: No Offset-Bending, Scatter-Gather IO, Truncating

Exercises

• Exercise: Copy A File
• Exercise: Create File With Hole
• Exercise: Read Temperature From Onewire Sensor

Footnotes

[1]

Processes are just as important