- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO
- HISTORY
- COPYRIGHT

# NAME

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

# SYNOPSIS

     #include <openssl/err.h>

     int ERR_GET_LIB(unsigned long e);

     int ERR_GET_FUNC(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, function code and reason code. `ERR_GET_LIB()`, `ERR_GET_FUNC()` 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 and function code describe where the error occurred, the reason code is the information about what went wrong.

Each sub-library of OpenSSL has a unique library number; function and reason codes are unique within each sub-library. Note that different libraries may use the same value to signal different functions and 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_FUNC()`, `ERR_GET_REASON()`, and `ERR_FATAL_ERROR()` are macros.

# RETURN VALUES

The library number, function code, reason code, and whether the error is fatal, respectively.

# SEE ALSO

ERR_get_error(3)

# HISTORY

`ERR_GET_LIB()`, `ERR_GET_FUNC()` and `ERR_GET_REASON()` are available in all versions of OpenSSL.

# COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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.