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134 .\" ========================================================================
135 .\"
136 .IX Title "ERR_GET_LIB 3"
137 .TH ERR_GET_LIB 3 "2000-01-31" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
140 .if n .ad l
141 .nh
142 .SH "NAME"
143 ERR_GET_LIB, ERR_GET_FUNC, ERR_GET_REASON \- get library, function and
144 reason code
145 .SH "LIBRARY"
146 libcrypto, -lcrypto
147 .SH "SYNOPSIS"
148 .IX Header "SYNOPSIS"
149 .Vb 1
150 \& #include <openssl/err.h>
151 \&
152 \& int ERR_GET_LIB(unsigned long e);
153 \&
154 \& int ERR_GET_FUNC(unsigned long e);
155 \&
156 \& int ERR_GET_REASON(unsigned long e);
157 .Ve
158 .SH "DESCRIPTION"
159 .IX Header "DESCRIPTION"
160 The error code returned by \fIERR_get_error()\fR consists of a library
161 number, function code and reason code. \s-1\fIERR_GET_LIB\s0()\fR, \s-1\fIERR_GET_FUNC\s0()\fR
162 and \s-1\fIERR_GET_REASON\s0()\fR can be used to extract these.
163 .PP
164 The library number and function code describe where the error
165 occurred, the reason code is the information about what went wrong.
166 .PP
167 Each sub-library of OpenSSL has a unique library number; function and
168 reason codes are unique within each sub-library. Note that different
169 libraries may use the same value to signal different functions and
170 reasons.
171 .PP
172 \&\fB\s-1ERR_R_\s0...\fR reason codes such as \fB\s-1ERR_R_MALLOC_FAILURE\s0\fR are globally
173 unique. However, when checking for sub-library specific reason codes,
174 be sure to also compare the library number.
175 .PP
176 \&\s-1\fIERR_GET_LIB\s0()\fR, \s-1\fIERR_GET_FUNC\s0()\fR and \s-1\fIERR_GET_REASON\s0()\fR are macros.
177 .SH "RETURN VALUES"
178 .IX Header "RETURN VALUES"
179 The library number, function code and reason code respectively.
180 .SH "SEE ALSO"
181 .IX Header "SEE ALSO"
182 \&\fIopenssl_err\fR\|(3), \fIERR_get_error\fR\|(3)
183 .SH "HISTORY"
184 .IX Header "HISTORY"
185 \&\s-1\fIERR_GET_LIB\s0()\fR, \s-1\fIERR_GET_FUNC\s0()\fR and \s-1\fIERR_GET_REASON\s0()\fR are available in
186 all versions of SSLeay and OpenSSL.