The ldap_result() function is used to obtain the result of a
    previous asynchronously initiated operation. Note that depending
    on how it is called, ldap_result() may actually return a list or
    "chain" of result messages. Once a chain of messages has been
    returned to the caller, it is no longer tied in any caller-
    visible way to the LDAP request that produced it. Therefore,
    a chain of messages returned by calling ldap_result() or by
    calling a synchronous search function will never be affected
    by subsequent LDAP API calls (except for ldap_msgfree(), which is
    used to dispose of a chain of messages).

    The ldap_msgfree() function frees the result messages (possibly
    an entire chain of messages) obtained from a previous call to
    ldap_result() or from a call to a synchronous search function.

    The ldap_msgtype() function returns the type of an LDAP message.
    The ldap_msgid() function returns the message ID of an LDAP
    message.

            int ldap_result(
                    LDAP                               *ld,
                    int                                msgid,
                    int                                all,
                    struct timeval                     *timeout,
                    LDAPMessage                        **res
            );

            int ldap_msgfree( LDAPMessage *res );

            int ldap_msgtype( LDAPMessage *res );

            int ldap_msgid( LDAPMessage *res );

    Parameters are as follows:

    ld             The session handle.
    msgid          The message id of the operation whose results are
                   to be returned, or the constant LDAP_RES_ANY (-1)
                   if any result is desired.
    all            Specifies how many messages will be retrieved in
                   a single call to ldap_result(). This parameter
                   only has meaning for search results. Pass the
                   constant LDAP_MSG_ONE (0x00) to retrieve one
                   message at a time. Pass LDAP_MSG_ALL (0x01) to
                   request that all results of a search be received
                   before returning all results in a single chain.
                   Pass LDAP_MSG_RECEIVED (0x02) to indicate that all
                   results retrieved so far should be returned in the
                   result chain.
    timeout        A timeout specifying how long to wait for results
                   to be returned. A NULL value causes ldap_result()
                   to block until results are available. A timeout
                   value of zero seconds specifies a polling
                   behavior.
    res            For ldap_result(), a result parameter that will
                   contain the result(s) of the operation. For ldap_
                   msgfree(), the result chain to be freed, obtained
                   from a previous call to ldap_result(), ldap_
                   search_s(), or ldap_search_st().

    Upon successful completion, ldap_result() returns the type of the
    first result returned in the res parameter. This will be one of
    the following constants.

            LDAP_RES_BIND (0x61)

            LDAP_RES_SEARCH_ENTRY (0x64)

            LDAP_RES_SEARCH_REFERENCE (0x73)      -- new in LDAPv3

            LDAP_RES_SEARCH_RESULT (0x65)

            LDAP_RES_MODIFY (0x67)

            LDAP_RES_ADD (0x69)

            LDAP_RES_DELETE (0x6B)

            LDAP_RES_MODDN (0x6D)

            LDAP_RES_COMPARE (0x6F)

            LDAP_RES_EXTENDED (0x78)              -- new in LDAPv3

    The ldap_result() function returns 0 if the timeout expired and
    -1 if an error occurs, in which case the error parameters of the
    LDAP session handle will be set accordingly.

    The ldap_msgfree() function frees the result structure pointed to
    by res and returns the type of the message it freed.

    The ldap_msgtype() function returns the type of the LDAP message
    it is passed as a parameter. The type will be one of the types
    listed above, or -1 on error.

    The ldap_msgid() function returns the message ID associated with
    the LDAP message passed as a parameter.