mirror of https://github.com/openssl/openssl.git
73 lines
2.1 KiB
Plaintext
73 lines
2.1 KiB
Plaintext
=pod
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=head1 NAME
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ERR_GET_LIB, ERR_GET_REASON, ERR_FATAL_ERROR
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- get information from error codes
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=head1 SYNOPSIS
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#include <openssl/err.h>
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int ERR_GET_LIB(unsigned long e);
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int ERR_GET_REASON(unsigned long e);
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int ERR_FATAL_ERROR(unsigned long e);
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=head1 DESCRIPTION
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The error code returned by ERR_get_error() consists of a library
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number and reason code. ERR_GET_LIB()
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and ERR_GET_REASON() can be used to extract these.
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ERR_FATAL_ERROR() indicates whether a given error code is a fatal error.
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The library number describes where the error
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occurred, the reason code is the information about what went wrong.
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Each sub-library of OpenSSL has a unique library number; the
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reason code is unique within each sub-library. Note that different
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libraries may use the same value to signal different reasons.
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B<ERR_R_...> reason codes such as B<ERR_R_MALLOC_FAILURE> are globally
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unique. However, when checking for sub-library specific reason codes,
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be sure to also compare the library number.
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ERR_GET_LIB(), ERR_GET_REASON(), and ERR_FATAL_ERROR() are macros.
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=head1 RETURN VALUES
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The library number, reason code, and whether the error
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is fatal, respectively.
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Starting with OpenSSL 3.0.0, the function code is always set to zero.
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=head1 NOTES
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Applications should not make control flow decisions based on specific error
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codes. Error codes are subject to change at any time (even in patch releases of
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OpenSSL). A particular error code can only be considered meaningful for control
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flow decisions if it is explicitly documented as such. New failure codes may
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still appear at any time.
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=head1 SEE ALSO
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L<ERR_get_error(3)>
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=head1 HISTORY
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ERR_GET_LIB() and ERR_GET_REASON() are available in all versions of OpenSSL.
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ERR_GET_FUNC() was removed in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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