Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
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 v5.26.0			  2017-02-28		      Net::protoent(3)

NAME | SYNOPSIS | DESCRIPTION | NOTE | AUTHOR

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Net::protoent&sektion=3&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help