


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


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;
            }



perl v5.10.1                2003-12-02                          1





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


            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 v5.10.1                2003-12-02                          2


