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Programming Ruby The Pragmatic Programmer's Guide |
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Index:
Ruby exception objects are subclasses of 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.
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Errno::EACCES::Errno
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13
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Errno::EAGAIN::Errno
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11
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Errno::EINTR::Errno
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4
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The full list of operating system errors on your particular
platform are available as the constants of Errno.
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Errno.constants
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E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, EADV, EAFNOSUPPORT, EAGAIN, ...
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Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"
Copyright
©
2001 by Addison Wesley Longman, Inc. This material may
be distributed only subject to the terms and conditions set forth in
the Open Publication License, v1.0 or later (the latest version is
presently available at http://www.opencontent.org/openpub/)).
Distribution of substantively modified versions of this document is
prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard
(paper) book form is prohibited unless prior permission is obtained
from the copyright holder.
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