Net::servent

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



NAME
       Net::servent - by-name interface to Perl’s built-in getserv*() func-
       tions

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(), get-
       servbyname(), and getnetbyport() functions, replacing them with ver-
       sions 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 names-
       pace 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()" cor-
       responds 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 mod-
       ule to build a struct-like class, you shouldn’t rely upon this.

AUTHOR
       Tom Christiansen



perl v5.8.8			  2001-09-21		      Net::servent(3)