


Net::protoent(3p)Perl Programmers Reference GuidNet::protoent(3p)


NAME
       Net::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





2001-05-24                 perl v5.6.1                          1


