Kerium
Kerium is a small library containing some POSIX-style code. The focus is on providing shared utilities for other projects.
Logging
Kerium exposes a flexible logging API that uses the same levels as syslog.
Errors
The entire set of POSIX errnos are exposed through the Errno enum.
The ErrnoException class extends the built-in Error with errnos, and provides JSON functionality.
You can use strerror to get a human-readable description of an errno.