(no version information, might be only in CVS)
tcpwrap_check -- 
     tcpwrap check
    
Description
bool 
tcpwrap_check ( string daemon, string address [, string user [, bool nodns]])
     This function consults /etc/hosts.allow and /etc/hosts.deny files to 
     check if access to service daemon should be
     granted or denied for client with remote address 
     address (and optional username 
     user). address can be 
     either IP address or domain name. user can be 
     NULL.
    
     If address looks like domain name then DNS is 
     used to resolve it to IP address; set nodns to 
     TRUE to avoid this.
    
     For more details please consult hosts_access(3) man page.
    
     This function returns TRUE if access should be granted, FALSE otherwise.