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124 .\" ========================================================================
126 .IX Title "ERR_error_string 3"
127 .TH ERR_error_string 3 "2012-04-19" "1.0.1a" "OpenSSL"
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133 ERR_error_string, ERR_error_string_n, ERR_lib_error_string,
134 ERR_func_error_string, ERR_reason_error_string \- obtain human\-readable
137 .IX Header "SYNOPSIS"
139 \& #include <openssl/err.h>
141 \& char *ERR_error_string(unsigned long e, char *buf);
142 \& void ERR_error_string_n(unsigned long e, char *buf, size_t len);
144 \& const char *ERR_lib_error_string(unsigned long e);
145 \& const char *ERR_func_error_string(unsigned long e);
146 \& const char *ERR_reason_error_string(unsigned long e);
149 .IX Header "DESCRIPTION"
150 \&\fIERR_error_string()\fR generates a human-readable string representing the
151 error code \fIe\fR, and places it at \fIbuf\fR. \fIbuf\fR must be at least 120
152 bytes long. If \fIbuf\fR is \fB\s-1NULL\s0\fR, the error string is placed in a
154 \&\fIERR_error_string_n()\fR is a variant of \fIERR_error_string()\fR that writes
155 at most \fIlen\fR characters (including the terminating 0)
156 and truncates the string if necessary.
157 For \fIERR_error_string_n()\fR, \fIbuf\fR may not be \fB\s-1NULL\s0\fR.
159 The string will have the following format:
162 \& error:[error code]:[library name]:[function name]:[reason string]
165 \&\fIerror code\fR is an 8 digit hexadecimal number, \fIlibrary name\fR,
166 \&\fIfunction name\fR and \fIreason string\fR are \s-1ASCII\s0 text.
168 \&\fIERR_lib_error_string()\fR, \fIERR_func_error_string()\fR and
169 \&\fIERR_reason_error_string()\fR return the library name, function
170 name and reason string respectively.
172 The OpenSSL error strings should be loaded by calling
173 \&\fIERR_load_crypto_strings\fR\|(3) or, for \s-1SSL\s0
174 applications, \fISSL_load_error_strings\fR\|(3)
176 If there is no text string registered for the given error code,
177 the error string will contain the numeric code.
179 \&\fIERR_print_errors\fR\|(3) can be used to print
180 all error codes currently in the queue.
182 .IX Header "RETURN VALUES"
183 \&\fIERR_error_string()\fR returns a pointer to a static buffer containing the
184 string if \fIbuf\fR \fB== \s-1NULL\s0\fR, \fIbuf\fR otherwise.
186 \&\fIERR_lib_error_string()\fR, \fIERR_func_error_string()\fR and
187 \&\fIERR_reason_error_string()\fR return the strings, and \fB\s-1NULL\s0\fR if
188 none is registered for the error code.
190 .IX Header "SEE ALSO"
191 \&\fIerr\fR\|(3), \fIERR_get_error\fR\|(3),
192 \&\fIERR_load_crypto_strings\fR\|(3),
193 \&\fISSL_load_error_strings\fR\|(3)
194 \&\fIERR_print_errors\fR\|(3)
197 \&\fIERR_error_string()\fR is available in all versions of SSLeay and OpenSSL.
198 \&\fIERR_error_string_n()\fR was added in OpenSSL 0.9.6.