Question on SLAP_SOCK_*_MUTE macros

[Nikita Shulga <malfet@jscc.ru>]

Good day, gentlemen!
I was looking thru latest sources of openldap/server and following  
bits of code confusing a bit.
Could you please spare a moment, look at them, and, if you'll be a  
gracious enough, explain me where I make a mistake here.

In daemon.c under #ifndef HAVE_POLL clause one may find following 
(servers/slapd/daemon.c, lines 302-305):
#define SLAP_SOCK_SET_MUTE(s)   FD_CLR(s, &readfds)
#define SLAP_SOCK_CLR_MUTE(s)   FD_SET(s, &readfds)
#define SLAP_SOCK_IS_MUTE(s)    FD_ISSET(s, &readfds)

Shouldn't SLAP_SOCK_IS_MUTE be defined as (!FD_ISSET(s, &readfds)) ?
Because, if treat it as defined, lines 1644-1645 make no sense:
                        if ( SLAP_SOCK_IS_MUTE( slap_listeners[l]- 
>sl_sd ))
                            SLAP_SOCK_CLR_MUTE( slap_listeners[l]- 
>sl_sd );

Are there any chance that there are typo in definition of  
SLAP_SOCK_IS_MUTE?

With best regards,
    Nikita

P.S. Please, excuse my poor English