


Net::servent(3p) Perl Programmers Reference GuideNet::servent(3p)


NAME
       Net::servent - by-name interface to Perl's built-in get-
       serv*() functions

SYNOPSIS
        use Net::servent;
        $s = getservbyname(shift || 'ftp') || die "no service";
        printf "port for %s is %s, aliases are %s\n",
           $s->name, $s->port, "@{$s->aliases}";

        use Net::servent qw(:FIELDS);
        getservbyname(shift || 'ftp') || die "no service";
        print "port for $s_name is $s_port, aliases are @s_aliases\n";


DESCRIPTION
       This module's default exports override the core getser-
       vent(), getservbyname(), and getnetbyport() functions,
       replacing them with versions that return "Net::servent"
       objects.  They take default second arguments of "tcp".
       This object has methods that return the similarly named
       structure field name from the C's servent structure from
       netdb.h; namely name, aliases, port, and proto.  The
       aliases method returns an array reference, the rest
       scalars.

       You may also import all the structure fields directly into
       your namespace as regular variables using the :FIELDS
       import tag.  (Note that this still overrides your core
       functions.)  Access these fields as variables named with a
       preceding "n_".  Thus, "$serv_obj->name()" corresponds to
       $s_name if you import the fields.  Array references are
       available as regular array variables, so for example "@{
       $serv_obj->aliases() }" would be simply @s_aliases.

       The getserv() function is a simple front-end that forwards
       a numeric argument to getservbyport(), and the rest to
       getservbyname().

       To access this functionality without the core overrides,
       pass the "use" an empty import list, and then access func-
       tion functions with their full qualified names.  On the
       other hand, the built-ins are still available via the
       "CORE::" pseudo-package.

EXAMPLES
        use Net::servent qw(:FIELDS);










2000-04-06                 perl v5.6.1                          1





Net::servent(3p) Perl Programmers Reference GuideNet::servent(3p)


        while (@ARGV) {
            my ($service, $proto) = ((split m!/!, shift), 'tcp');
            my $valet = getserv($service, $proto);
            unless ($valet) {
                warn "$0: No service: $service/$proto\n"
                next;
            }
            printf "service $service/$proto is port %d\n", $valet->port;
            print "alias are @s_aliases\n" if @s_aliases;
        }


NOTE
       While this class is currently implemented using the
       Class::Struct module to build a struct-like class, you
       shouldn't rely upon this.

AUTHOR
       Tom Christiansen






































2000-04-06                 perl v5.6.1                          2


