NAME¶
Net::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