NAME

ERR_GET_LIB, 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_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.

HISTORY

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

ERR_GET_FUNC() was removed in OpenSSL 3.0.

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