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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/include/bind9/isc/portset.h

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


/*! \file isc/portset.h
 * \brief Transport Protocol Port Manipulation Module
 *
 * This module provides simple utilities to handle a set of transport protocol
 * (UDP or TCP) port numbers, e.g., for creating an ACL list.  An isc_portset_t
 * object is an opaque instance of a port set, for which the user can add or
 * remove a specific port or a range of consecutive ports.  This object is
 * expected to be used as a temporary work space only, and does not protect
 * simultaneous access from multiple threads.  Therefore it must not be stored
 * in a place that can be accessed from multiple threads.
 */

#ifndef ISC_PORTSET_H
#define ISC_PORTSET_H 1

/***
 ***	Imports
 ***/

#include <stdbool.h>

#include <isc/net.h>

/***
 *** Functions
 ***/

ISC_LANG_BEGINDECLS

isc_result_t
isc_portset_create(isc_mem_t *mctx, isc_portset_t **portsetp);
/*%<
 * Create a port set and initialize it as an empty set.
 *
 * Requires:
 *\li	'mctx' to be valid.
 *\li	'portsetp' to be non NULL and '*portsetp' to be NULL;
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 */

void
isc_portset_destroy(isc_mem_t *mctx, isc_portset_t **portsetp);
/*%<
 * Destroy a port set.
 *
 * Requires:
 *\li	'mctx' to be valid and must be the same context given when the port set
 *       was created.
 *\li	'*portsetp' to be a valid set.
 */

bool
isc_portset_isset(isc_portset_t *portset, in_port_t port);
/*%<
 * Test whether the given port is stored in the portset.
 *
 * Requires:
 *\li	'portset' to be a valid set.
 *
 * Returns
 * \li	#true if the port is found, false otherwise.
 */

unsigned int
isc_portset_nports(isc_portset_t *portset);
/*%<
 * Provides the number of ports stored in the given portset.
 *
 * Requires:
 *\li	'portset' to be a valid set.
 *
 * Returns
 * \li	the number of ports stored in portset.
 */

void
isc_portset_add(isc_portset_t *portset, in_port_t port);
/*%<
 * Add the given port to the portset.  The port may or may not be stored in
 * the portset.
 *
 * Requires:
 *\li	'portlist' to be valid.
 */

void
isc_portset_remove(isc_portset_t *portset, in_port_t port);
/*%<
 * Remove the given port to the portset.  The port may or may not be stored in
 * the portset.
 *
 * Requires:
 *\li	'portlist' to be valid.
 */

void
isc_portset_addrange(isc_portset_t *portset, in_port_t port_lo,
		     in_port_t port_hi);
/*%<
 * Add a subset of [port_lo, port_hi] (inclusive) to the portset.  Ports in the
 * subset may or may not be stored in portset.
 *
 * Requires:
 *\li	'portlist' to be valid.
 *\li	port_lo <= port_hi
 */

void
isc_portset_removerange(isc_portset_t *portset, in_port_t port_lo,
			in_port_t port_hi);
/*%<
 * Subtract a subset of [port_lo, port_hi] (inclusive) from the portset.  Ports
 * in the subset may or may not be stored in portset.
 *
 * Requires:
 *\li	'portlist' to be valid.
 *\li	port_lo <= port_hi
 */

ISC_LANG_ENDDECLS

#endif	/* ISC_PORTSET_H */

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