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Net::protoent(3pm)     Perl Programmers Reference Guide     Net::protoent(3pm)

       Net::protoent - by-name interface to Perl's built-in getproto*()

        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";

       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.

       While this class is currently implemented using the Class::Struct
       module to build a struct-like class, you shouldn't rely upon this.

       Tom Christiansen

perl v5.12.1                      2010-04-26                Net::protoent(3pm)

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