Net::protoent(3p) Perl Programmers Reference Guide Net::protoent(3p) #
Net::protoent(3p) Perl Programmers Reference Guide Net::protoent(3p)
NNAAMMEE #
Net::protoent - by-name interface to Perl's built-in getproto*()
functions
SSYYNNOOPPSSIISS #
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 $p_proto, aliases are @p_aliases\n";
DDEESSCCRRIIPPTTIIOONN #
This module's default exports override the core ggeettpprroottooeenntt(()),
ggeettpprroottoobbyynnaammee(()), and ggeettnneettbbyyppoorrtt(()) functions, replacing them with
versions that return "Net::protoent" objects. They take default second
arguments of "tcp". This object has methods that return the similarly
named structure field name from the C's protoent structure from _n_e_t_d_b_._h;
namely name, aliases, and proto. The aliases method returns an array
reference, the rest scalars.
You may also import all the structure fields directly into your namespace
as regular variables using the :FIELDS import tag. (Note that this still
overrides your core functions.) Access these fields as variables named
with a preceding "p_". Thus, "$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 ggeettpprroottoo(()) function is a simple front-end that forwards a numeric
argument to ggeettpprroottoobbyyppoorrtt(()), and the rest to ggeettpprroottoobbyynnaammee(()).
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.
NNOOTTEE #
While this class is currently implemented using the Class::Struct module
to build a struct-like class, you shouldn't rely upon this.
AAUUTTHHOORR #
Tom Christiansen
perl v5.36.3 2019-02-13 Net::protoent(3p)