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.\" ========================================================================
.\"
.IX Title "ERR_GET_LIB 3"
.TH ERR_GET_LIB 3 "2019-12-20" "1.0.2u" "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 \- get library, function and
reason code
.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);
.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
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 and \s-1\fBERR_GET_REASON\s0()\fR are macros.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The library number, function code and reason code respectively.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBerr\fR\|(3), \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 SSLeay and OpenSSL.