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| module Errno | 
Exception. However,
  operating systems typically report errors using plain
  integers. Module Errno is created dynamically to map these
  operating system errors to Ruby classes, with each error number generating
  its own subclass of SystemCallError. As the subclass is created 
  in module Errno, its name will start Errno::.  
  The names of the Errno:: classes depend on the environment in
  which Ruby runs. On a typical Unix or Windows platform, there are
  Errno classes such as Errno::EACCES,
  Errno::EAGAIN, Errno::EINTR, and so on.
  The integer operating system error number corresponding to a
  particular error is available as the class constant
  Errno::error::Errno.
| Errno::EACCES::Errno | » | 13 | 
| Errno::EAGAIN::Errno | » | 11 | 
| Errno::EINTR::Errno | » | 4 | 
Errno. 
| Errno.constants | » | E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, EADV, EAFNOSUPPORT, EAGAIN, ... | 
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