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ERR_GET_LIB(3)                      OpenSSL                     ERR_GET_LIB(3)



NAME
       ERR_GET_LIB, ERR_GET_REASON, ERR_FATAL_ERROR - get information from
       error codes

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/err.h>

        int ERR_GET_LIB(unsigned long e);

        int ERR_GET_REASON(unsigned long e);

        int ERR_FATAL_ERROR(unsigned long e);

DESCRIPTION
       The error code returned by ERR_get_error() consists of a library number
       and reason code. ERR_GET_LIB() and ERR_GET_REASON() can be used to
       extract these.

       ERR_FATAL_ERROR() indicates whether a given error code is a fatal
       error.

       The library number describes where the error occurred, the reason code
       is the information about what went wrong.

       Each sub-library of OpenSSL has a unique library number; the reason
       code is unique within each sub-library.  Note that different libraries
       may use the same value to signal different reasons.

       ERR_R_... reason codes such as ERR_R_MALLOC_FAILURE are globally
       unique. However, when checking for sub-library specific reason codes,
       be sure to also compare the library number.

       ERR_GET_LIB(), ERR_GET_REASON(), and ERR_FATAL_ERROR() are macros.

RETURN VALUES
       The library number, reason code, and whether the error is fatal,
       respectively.  Starting with OpenSSL 3.0.0, the function code is always
       set to zero.

NOTES
       Applications should not make control flow decisions based on specific
       error codes. Error codes are subject to change at any time (even in
       patch releases of OpenSSL). A particular error code can only be
       considered meaningful for control flow decisions if it is explicitly
       documented as such. New failure codes may still appear at any time.

SEE ALSO
       ERR_get_error(3)

HISTORY
       ERR_GET_LIB() and ERR_GET_REASON() are available in all versions of
       OpenSSL.

       ERR_GET_FUNC() was removed in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07                    ERR_GET_LIB(3)