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ERR_error_string(3)                 OpenSSL                ERR_error_string(3)

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.

1.0.2k                            2017-01-26               ERR_error_string(3)