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_func_error_string(unsigned long e);
        const char *ERR_reason_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 120 bytes long. If buf is NULL, the error string is
       placed in a static buffer.  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]:[function name]:[reason string]

       error code is an 8 digit hexadecimal number, library name, function name and reason string
       are ASCII text.

       ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the
       library name, function name and reason string respectively.

       The OpenSSL error strings should be loaded by calling ERR_load_crypto_strings(3) or, for
       SSL applications, SSL_load_error_strings(3) first.  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(), ERR_func_error_string() and ERR_reason_error_string() return the
       strings, and NULL if none is registered for the error code.

SEE ALSO

       err(3), ERR_get_error(3), ERR_load_crypto_strings(3), SSL_load_error_strings(3)
       ERR_print_errors(3)

HISTORY

       ERR_error_string() is available in all versions of SSLeay and OpenSSL.
       ERR_error_string_n() was added in OpenSSL 0.9.6.