System Calls

Knowing what the responsibilities of an OS kernel are, it is clear that a request for one of its services (like opening a file for reading) cannot be an ordinary function call.

Here we discuss what a system call is, how system call errors are generally handled (spoiler: a global variable 🐷) and what debugging tools exist at that level (spoiler: strace).

• System Calls: Overview
• errno, And Error Handling