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ERR_get_error(3)                    OpenSSL                   ERR_get_error(3)

NAME
       ERR_get_error, ERR_peek_error, ERR_peek_last_error, ERR_get_error_line,
       ERR_peek_error_line, ERR_peek_last_error_line, ERR_get_error_line_data,
       ERR_peek_error_line_data, ERR_peek_last_error_line_data - obtain error
       code and data
SYNOPSIS
        #include <openssl/err.h>
        unsigned long ERR_get_error(void);
        unsigned long ERR_peek_error(void);
        unsigned long ERR_peek_last_error(void);
        unsigned long ERR_get_error_line(const char **file, int *line);
        unsigned long ERR_peek_error_line(const char **file, int *line);
        unsigned long ERR_peek_last_error_line(const char **file, int *line);
        unsigned long ERR_get_error_line_data(const char **file, int *line,
                const char **data, int *flags);
        unsigned long ERR_peek_error_line_data(const char **file, int *line,
                const char **data, int *flags);
        unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
                const char **data, int *flags);
DESCRIPTION
       ERR_get_error() returns the earliest error code from the thread's error
       queue and removes the entry. This function can be called repeatedly
       until there are no more error codes to return.
       ERR_peek_error() returns the earliest error code from the thread's
       error queue without modifying it.
       ERR_peek_last_error() returns the latest error code from the thread's
       error queue without modifying it.
       See ERR_GET_LIB(3) for obtaining information about location and reason
       of the error, and ERR_error_string(3) for human-readable error
       messages.
       ERR_get_error_line(), ERR_peek_error_line() and
       ERR_peek_last_error_line() are the same as the above, but they
       additionally store the file name and line number where the error
       occurred in *file and *line, unless these are NULL.
       ERR_get_error_line_data(), ERR_peek_error_line_data() and
       ERR_peek_last_error_line_data() store additional data and flags
       associated with the error code in *data and *flags, unless these are
       NULL. *data contains a string if *flags&ERR_TXT_STRING is true.
       An application MUST NOT free the *data pointer (or any other pointers
       returned by these functions) with OPENSSL_free() as freeing is handled
       automatically by the error library.
RETURN VALUES
       The error code, or 0 if there is no error in the queue.
SEE ALSO
       err(3), ERR_error_string(3), ERR_GET_LIB(3)
HISTORY
       ERR_get_error(), ERR_peek_error(), ERR_get_error_line() and
       ERR_peek_error_line() are available in all versions of SSLeay and
       OpenSSL. ERR_get_error_line_data() and ERR_peek_error_line_data() were
       added in SSLeay 0.9.0.  ERR_peek_last_error(),
       ERR_peek_last_error_line() and ERR_peek_last_error_line_data() were
       added in OpenSSL 0.9.7.

1.0.2k                            2017-01-26                  ERR_get_error(3)