Hands-On System Programming with Go

Chapter 8

1. What's an exit code? Who makes use of it? The exit code is an integer value passed from a process to is parent to signal when the process ends. It represents the outcome of the process, and it is 0 if there have been no errors. The parent process can use this value to decide what to do next, such as running the process again if there is an error.
2. What happens when an application panics? What exit code is returned? If  panic is not recovered, the application will execute all the deferred functions and will exit with a status of 2.
3. What's the default behavior of a Go application when receiving all signals? The default behavior of a Go application with signals is an early exit.
4. How do you intercept signals and decide how the application ...