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134 .\" ========================================================================
136 .IX Title "ERR_error_string 3"
137 .TH ERR_error_string 3 "2004-11-14" "1.1.0-dev" "OpenSSL"
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143 ERR_error_string, ERR_error_string_n, ERR_lib_error_string,
144 ERR_func_error_string, ERR_reason_error_string \- obtain human\-readable
149 .IX Header "SYNOPSIS"
151 \& #include <openssl/err.h>
153 \& char *ERR_error_string(unsigned long e, char *buf);
154 \& void ERR_error_string_n(unsigned long e, char *buf, size_t len);
156 \& const char *ERR_lib_error_string(unsigned long e);
157 \& const char *ERR_func_error_string(unsigned long e);
158 \& const char *ERR_reason_error_string(unsigned long e);
161 .IX Header "DESCRIPTION"
162 \&\fIERR_error_string()\fR generates a human-readable string representing the
163 error code \fIe\fR, and places it at \fIbuf\fR. \fIbuf\fR must be at least 120
164 bytes long. If \fIbuf\fR is \fB\s-1NULL\s0\fR, the error string is placed in a
166 \&\fIERR_error_string_n()\fR is a variant of \fIERR_error_string()\fR that writes
167 at most \fIlen\fR characters (including the terminating 0)
168 and truncates the string if necessary.
169 For \fIERR_error_string_n()\fR, \fIbuf\fR may not be \fB\s-1NULL\s0\fR.
171 The string will have the following format:
174 \& error:[error code]:[library name]:[function name]:[reason string]
177 \&\fIerror code\fR is an 8 digit hexadecimal number, \fIlibrary name\fR,
178 \&\fIfunction name\fR and \fIreason string\fR are \s-1ASCII\s0 text.
180 \&\fIERR_lib_error_string()\fR, \fIERR_func_error_string()\fR and
181 \&\fIERR_reason_error_string()\fR return the library name, function
182 name and reason string respectively.
184 The OpenSSL error strings should be loaded by calling
185 \&\fIERR_load_crypto_strings\fR\|(3) or, for \s-1SSL\s0
186 applications, \fISSL_load_error_strings\fR\|(3)
188 If there is no text string registered for the given error code,
189 the error string will contain the numeric code.
191 \&\fIERR_print_errors\fR\|(3) can be used to print
192 all error codes currently in the queue.
194 .IX Header "RETURN VALUES"
195 \&\fIERR_error_string()\fR returns a pointer to a static buffer containing the
196 string if \fIbuf\fR \fB== \s-1NULL\s0\fR, \fIbuf\fR otherwise.
198 \&\fIERR_lib_error_string()\fR, \fIERR_func_error_string()\fR and
199 \&\fIERR_reason_error_string()\fR return the strings, and \fB\s-1NULL\s0\fR if
200 none is registered for the error code.
202 .IX Header "SEE ALSO"
203 \&\fIopenssl_err\fR\|(3), \fIERR_get_error\fR\|(3),
204 \&\fIERR_load_crypto_strings\fR\|(3),
205 \&\fISSL_load_error_strings\fR\|(3)
206 \&\fIERR_print_errors\fR\|(3)
209 \&\fIERR_error_string()\fR is available in all versions of SSLeay and OpenSSL.
210 \&\fIERR_error_string_n()\fR was added in OpenSSL 0.9.6.