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.\" ========================================================================
.\"
.IX Title "ERR_GET_LIB 3"
.TH ERR_GET_LIB 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ERR_GET_LIB, ERR_GET_FUNC, ERR_GET_REASON, ERR_FATAL_ERROR \&\- get information from error codes
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The error code returned by \fBERR_get_error()\fR consists of a library
number, function code and reason code. \s-1\fBERR_GET_LIB\s0()\fR, \s-1\fBERR_GET_FUNC\s0()\fR
and \s-1\fBERR_GET_REASON\s0()\fR can be used to extract these.
.PP
\&\s-1\fBERR_FATAL_ERROR\s0()\fR indicates whether a given error code is a fatal error.
.PP
The library number and function code describe where the error
occurred, the reason code is the information about what went wrong.
.PP
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.
.PP
\&\fB\s-1ERR_R_...\s0\fR reason codes such as \fB\s-1ERR_R_MALLOC_FAILURE\s0\fR are globally
unique. However, when checking for sub-library specific reason codes,
be sure to also compare the library number.
.PP
\&\s-1\fBERR_GET_LIB\s0()\fR, \s-1\fBERR_GET_FUNC\s0()\fR, \s-1\fBERR_GET_REASON\s0()\fR, and \s-1\fBERR_FATAL_ERROR\s0()\fR
are macros.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The library number, function code, reason code, and whether the error
is fatal, respectively.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\s-1\fBERR_GET_LIB\s0()\fR, \s-1\fBERR_GET_FUNC\s0()\fR and \s-1\fBERR_GET_REASON\s0()\fR are available in
all versions of OpenSSL.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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