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Title "ERR_ERROR_STRING 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
ERR_error_string, ERR_error_string_n, ERR_lib_error_string, ERR_func_error_string, ERR_reason_error_string - obtain human-readable error message Header "SYNOPSIS" .Vb 1 #include <openssl/err.h> \& char *ERR_error_string(unsigned long e, char *buf); void ERR_error_string_n(unsigned long e, char *buf, size_t len); \& const char *ERR_lib_error_string(unsigned long e); const char *ERR_reason_error_string(unsigned long e); .Ve

Deprecated in OpenSSL 3.0:

.Vb 1 const char *ERR_func_error_string(unsigned long e); .Ve

Header "DESCRIPTION" \fBERR_error_string() generates a human-readable string representing the error code e, and places it at buf. buf must be at least 256 bytes long. If buf is \s-1NULL\s0, the error string is placed in a static buffer. Note that this function is not thread-safe and does no checks on the size of the buffer; use ERR_error_string_n() instead.

\fBERR_error_string_n() is a variant of ERR_error_string() that writes at most len characters (including the terminating 0) and truncates the string if necessary. For ERR_error_string_n(), buf may not be \s-1NULL\s0.

The string will have the following format:

.Vb 1 error:[error code]:[library name]::[reason string] .Ve

\fIerror code is an 8 digit hexadecimal number, library name and \fIreason string are \s-1ASCII\s0 text.

\fBERR_lib_error_string() and ERR_reason_error_string() return the library name and reason string respectively.

If there is no text string registered for the given error code, the error string will contain the numeric code.

\fBERR_print_errors\|(3) can be used to print all error codes currently in the queue.

Header "RETURN VALUES" \fBERR_error_string() returns a pointer to a static buffer containing the string if buf == \s-1NULL\s0, buf otherwise.

\fBERR_lib_error_string() and ERR_reason_error_string() return the strings, and \s-1NULL\s0 if none is registered for the error code.

\fBERR_func_error_string() returns \s-1NULL.\s0

Header "SEE ALSO" \fBERR_get_error\|(3), \fBERR_print_errors\|(3) Header "HISTORY" \fBERR_func_error_string() became deprecated in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.