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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 v5.16.2                                     2012-08-26                                Net::servent(3pm)