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

       Net::servent - by-name interface to Perl's built-in getserv*()

        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";

       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.

        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"
            printf "service $service/$proto is port %d\n", $valet->port;
            print "alias are @s_aliases\n" if @s_aliases;

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

       Tom Christiansen

perl v5.12.1                      2010-04-26                 Net::servent(3pm)

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Gedruckt am: 21.11.2017 13:06 GMT+0100 (2017-11-21T13:06:16+01:00)