Exception: IOError

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses: EOFError
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, ::StandardError, ::Exception
Instance Chain: self, ::StandardError, ::Exception
Inherits:	StandardError ::Object Exception StandardError IOError
Defined in:	io.c, io.c

Overview

Raised when an ::IO operation fails.

File.open("/etc/hosts") {|f| f << "example"}
  #=> IOError: not opened for writing

File.open("/etc/hosts") {|f| f.close; f.read }
  #=> IOError: closed stream

Note that some ::IO failures raise ::SystemCallErrors and these are not subclasses of IOError:

File.open("does/not/exist")
  #=> Errno::ENOENT: No such file or directory - does/not/exist

Class Attribute Summary

::Exception - Inherited

.to_tty?

Returns true if exception messages will be sent to a tty.

Class Method Summary

::Exception - Inherited

.exception	With no argument, or if the argument is the same as the receiver, return the receiver.
.new	Construct a new ::Exception object, optionally passing in a message.

Instance Method Summary

::Exception - Inherited

#==	Equality—If obj is not an ::Exception, returns `false`.
#backtrace	Returns any backtrace associated with the exception.
#backtrace_locations	Returns any backtrace associated with the exception.
#cause	Returns the previous exception ($!) at the time this exception was raised.
#exception	With no argument, or if the argument is the same as the receiver, return the receiver.
#full_message	Returns formatted string of exception.
#inspect	Return this exception's class name and message.
#message	Returns the result of invoking `exception.to_s`.
#set_backtrace	Sets the backtrace information associated with `exc`.
#to_s	Returns exception's message (or the name of the exception if no message is set).

Constructor Details

This class inherits a constructor from Exception