Net::servent

See the current Perl documentation for Net::servent.

Here is our local, out-dated (pre-5.6) version:

Net::servent - by-name interface to Perl's built-in getserv*() functions

 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(:FIE
    

    

This module's default exports override the core 
getservent(), 
getservbyname(), and 
getnetbyport() 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
 netdb.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 
getserv() function is a simple front-end that forwards a numeric argument to 
getservbyport(), and the rest to 
getservbyname().


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.



EXAMPLES

 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;
 }



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