SystemCallError

        # SystemCallError < StandardError

(from ruby core)
---
SystemCallError is the base class for all low-level platform-dependent
errors.

The errors available on the current platform are subclasses of
SystemCallError and are defined in the Errno module.

    File.open("does/not/exist")

*raises the exception:*

    Errno::ENOENT: No such file or directory - does/not/exist
---
# Class methods:

    ===
    new

# Instance methods:

    errno