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Exception: IOError

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
EOFError, IO::TimeoutError
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::StandardError, ::Exception
Instance Chain:
self, ::StandardError, ::Exception
Inherits: StandardError
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 terminal device.

Class Method Summary

::Exception - Inherited

.exception

Returns an exception object of the same class as self; useful for creating a similar exception, but with a different message.
.new

Returns a new exception object.

Instance Method Summary

::Exception - Inherited

#==

Returns whether object is the same class as self and its #message and #backtrace are equal to those of self.
#backtrace

Returns a backtrace value for self; the returned value depends on the form of the stored backtrace value:
#backtrace_locations

Returns a backtrace value for self; the returned value depends on the form of the stored backtrace value:
#cause

Returns the previous value of global variable $!, which may be nil (see Global Variables):
#detailed_message

Returns the message string with enhancements:
#exception

Returns an exception object of the same class as self; useful for creating a similar exception, but with a different message.
#full_message

Returns an enhanced message string:
#inspect

Returns a string representation of self:
#message

Returns #to_s.
#set_backtrace

Sets the backtrace value for self; returns the given +value:
#to_s

Returns a string representation of self:

Constructor Details

This class inherits a constructor from Exception