Net::protoent(3) Perl Programmers Reference GuideNet::protoent(3)NAMENet::protoent - by-name interface to Perl's built-in
getproto*() functions
SYNOPSIS
use Net::protoent;
$p = getprotobyname(shift || 'tcp') || die "no proto";
printf "proto for %s is %d, aliases are %s\n",
$p->name, $p->proto, "@{$p->aliases}";
use Net::protoent qw(:FIELDS);
getprotobyname(shift || 'tcp') || die "no proto";
print "proto for $p_name is $p_proto, aliases are @p_aliases\n";
DESCRIPTION
This module's default exports override the core
getprotoent(), getprotobyname(), and getnetbyport()
functions, replacing them with versions that return
"Net::protoent" objects. They take default second
arguments of "tcp". This object has methods that return
the similarly named structure field name from the C's
protoent structure from netdb.h; namely name, aliases, 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 p_. Thus, $proto_obj->name() corresponds to
$p_name if you import the fields. Array references are
available as regular array variables, so for example @{
$proto_obj->aliases() } would be simply @p_aliases.
The getproto() function is a simple front-end that
forwards a numeric argument to getprotobyport(), and the
rest to getprotobyname().
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.
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
16/Sep/1999 perl 5.005, patch 03 1
Net::protoent(3) Perl Programmers Reference GuideNet::protoent(3)16/Sep/1999 perl 5.005, patch 03 2