Ruby SystemCallError

Its a good idea to be aware of all of the subclasses of SystemCallError¹ which are defined in the Errno² module. It is easier when using system calls to rescue from StandardError, but sometimes if we want to catch and respond to very specific error conditions (like the file system is read-only Errno::EROFS or the disk is full on the device you are trying to write to Errno::ENOSPC). Also, rescuing from SystemCallError is more specific than StandardError.

This blog post on honeybadger.io is useful.

1. https://ruby-doc.org/core-2.4.0/SystemCallError.html ↩

2. https://ruby-doc.org/core-2.4.0/Errno.html ↩