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- NNNNeeeetttt::::::::sssseeeerrrrvvvveeeennnntttt((((3333)))) NNNNeeeetttt::::::::sssseeeerrrrvvvveeeennnntttt((((3333))))
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- NNNNAAAAMMMMEEEE
- Net::servent - by-name interface to Perl's built-in getserv*() functions
-
- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- use Net::servent;
- $s = getservbyname(shift || 'ftp') || die "no service";
- printf "port for %s is %s, aliases are %s\n",
- $s->name, $s->port, "@{$s->aliases}";
-
- use Net::servent qw(:FIELDS);
- getservbyname(shift || 'ftp') || die "no service";
- print "port for $s_name is $s_port, aliases are @s_aliases\n";
-
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- This module's default exports override the core _g_e_t_s_e_r_v_e_n_t(),
- _g_e_t_s_e_r_v_b_y_n_a_m_e(), and _g_e_t_n_e_t_b_y_p_o_r_t() functions, replacing them with
- versions that return "Net::servent" objects. They take default second
- arguments of "tcp". This object has methods that return the similarly
- named structure field name from the C's servent structure from _n_e_t_d_b._h;
- namely name, aliases, port, 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 n_. Thus, $serv_obj->name() corresponds to $s_name if
- you import the fields. Array references are available as regular array
- variables, so for example @{ $serv_obj->aliases() } would be simply
- @s_aliases.
-
- The _g_e_t_s_e_r_v() function is a simple front-end that forwards a numeric
- argument to _g_e_t_s_e_r_v_b_y_p_o_r_t(), and the rest to _g_e_t_s_e_r_v_b_y_n_a_m_e().
-
- To access this functionality without the core overrides, pass the use an
- empty import list, and then access function functions with their full
- qualified names. On the other hand, the built-ins are still available
- via the CORE:: pseudo-package.
-
- EEEEXXXXAAAAMMMMPPPPLLLLEEEESSSS
- use Net::servent qw(:FIELDS);
-
- while (@ARGV) {
- my ($service, $proto) = ((split m!/!, shift), 'tcp');
- my $valet = getserv($service, $proto);
- unless ($valet) {
- warn "$0: No service: $service/$proto\n"
- next;
- }
- printf "service $service/$proto is port %d\n", $valet->port;
- print "alias are @s_aliases\n" if @s_aliases;
- }
-
-
-
- PPPPaaaaggggeeee 1111
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- NNNNeeeetttt::::::::sssseeeerrrrvvvveeeennnntttt((((3333)))) NNNNeeeetttt::::::::sssseeeerrrrvvvveeeennnntttt((((3333))))
-
-
-
- NNNNOOOOTTTTEEEE
- While this class is currently implemented using the Class::Struct module
- to build a struct-like class, you shouldn't rely upon this.
-
- AAAAUUUUTTTTHHHHOOOORRRR
- Tom Christiansen
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- PPPPaaaaggggeeee 2222
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