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Net::servent

Section: Perl Programmers Reference Guide (3)
Updated: perl 5.004, patch 04
Index

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(), andgetnetbyport() functions, replacing them with versions that return``Net::servent'' objects. They take default second arguments of ``tcp''. This object has methods that return the similarlynamed structure field name from the C's servent structure from netdb.h;namely name, aliases, port, and proto. The aliasesmethod returns an array reference, the rest scalars.

You may also import all the structure fields directly into your namespaceas regular variables using the :FIELDS import tag. (Note that this stilloverrides your core functions.) Access these fields as variables namedwith a preceding n_. Thus, $serv_obj->name() corresponds to$s_name if you import the fields. Array references are available asregular array variables, so for example @{ $serv_obj->aliases()} would be simply @s_aliases.

The getserv() function is a simple front-end that forwards a numericargument to getservbyport(), and the rest to getservbyname().

To access this functionality without the core overrides,pass the use an empty import list, and then accessfunction functions with their full qualified names.On the other hand, the built-ins are still availablevia 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::Structmodule to build a struct-like class, you shouldn't rely upon this.

AUTHOR

Tom Christiansen

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