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



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 v5.8.8                       2001-09-21                  Net::protoent(3)