Net::protoent(3) Perl Programmers Reference GuideNet::protoent(3)NAMENet::protoent - by-name interface to Perl's built-in get
proto*() 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 $p_proto, aliases are @p_aliases\n";
DESCRIPTION
This module's default exports override the core getpro_
toent(), getprotobyname(), and getnetbyport() functions,
replacing them with versions that return "Net::protoent"
objects. They take default second arguments of "tcp".
This object has methods that return the similarly named
structure field name from the C's protoent structure from
netdb.h; namely name, aliases, and proto. The aliases
method returns an array reference, the rest scalars.
You may also import all the structure fields directly into
your namespace as regular variables using the :FIELDS
import tag. (Note that this still overrides your core
functions.) Access these fields as variables named with a
preceding "p_". Thus, "$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 for
wards a numeric argument to getprotobyport(), and the rest
to getprotobyname(). This function is not exported by
default.
To access this functionality without the core overrides,
pass the "use" an empty import list, and then access func
tion 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
2001-02-22 perl v5.6.1 Net::protoent(3)
