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download PDF document: ERR_reason_error_string.3.pdf

ERR_ERROR_STRING(3ossl) OpenSSL ERR_ERROR_STRING(3ossl)

NAME ERR_error_string, ERR_error_string_n, ERR_lib_error_string, ERR_func_error_string, ERR_reason_error_string - obtain human-readable error message
SYNOPSIS #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);
Deprecated in OpenSSL 3.0:
const char *ERR_func_error_string(unsigned long e);
DESCRIPTION ERR_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 NULL, 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.
ERR_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 NULL.
The string will have the following format:
error:[error code]:[library name]::[reason string]
error code is an 8 digit hexadecimal number, library name and reason string are ASCII text.
ERR_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.
ERR_print_errors(3) can be used to print all error codes currently in the queue.
RETURN VALUES ERR_error_string() returns a pointer to a static buffer containing the string if buf == NULL, buf otherwise.
ERR_lib_error_string() and ERR_reason_error_string() return the strings, and NULL if none is registered for the error code.
ERR_func_error_string() returns NULL.
SEE ALSO ERR_get_error(3), ERR_print_errors(3) Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.
3.0.11 2023-09-19 ERR_ERROR_STRING(3ossl)