Net::servent(3pm)                               Perl Programmers Reference Guide                               Net::servent(3pm)



NAME
       Net::servent - by-name interface to Perl's built-in getserv*() 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 getservent(), 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
       "s_".  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 function
       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);

        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



perl v5.12.4                                               2011-06-01                                          Net::servent(3pm)