


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


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






perl v5.10.1                2002-10-27                          1


