FM / isc

/usr/include/bind9/isc

Name	Size	Mode	Actions
aes.h	1015	0644	edit dl rm
align.h	569	0644	edit dl rm
app.h	7139	0644	edit dl rm
assertions.h	2227	0644	edit dl rm
astack.h	1137	0644	edit dl rm
atomic.h	3082	0644	edit dl rm
backtrace.h	3894	0644	edit dl rm
barrier.h	1052	0644	edit dl rm
base32.h	4453	0644	edit dl rm
base64.h	2865	0644	edit dl rm
bind9.h	829	0644	edit dl rm
buffer.h	30625	0644	edit dl rm
bufferlist.h	1453	0644	edit dl rm
cmocka.h	1383	0644	edit dl rm
commandline.h	1711	0644	edit dl rm
condition.h	1914	0644	edit dl rm
counter.h	1922	0644	edit dl rm
crc64.h	998	0644	edit dl rm
deprecated.h	662	0644	edit dl rm
dir.h	1545	0644	edit dl rm
endian.h	4868	0644	edit dl rm
errno.h	659	0644	edit dl rm
errno2result.h	901	0644	edit dl rm
error.h	1434	0644	edit dl rm
event.h	3442	0644	edit dl rm
eventclass.h	1442	0644	edit dl rm
file.h	11669	0644	edit dl rm
formatcheck.h	940	0644	edit dl rm
fsaccess.h	7453	0644	edit dl rm
fuzz.h	593	0644	edit dl rm
hash.h	1649	0644	edit dl rm
heap.h	5263	0644	edit dl rm
hex.h	2805	0644	edit dl rm
hmac.h	3970	0644	edit dl rm
hp.h	4588	0644	edit dl rm
ht.h	4485	0644	edit dl rm
httpd.h	2291	0644	edit dl rm
interfaceiter.h	3141	0644	edit dl rm
iterated_hash.h	933	0644	edit dl rm
lang.h	686	0644	edit dl rm
lex.h	10004	0644	edit dl rm
lfsr.h	2955	0644	edit dl rm
lib.h	1155	0644	edit dl rm
likely.h	868	0644	edit dl rm
list.h	8085	0644	edit dl rm
log.h	26497	0644	edit dl rm
magic.h	999	0644	edit dl rm
managers.h	776	0644	edit dl rm
md.h	5760	0644	edit dl rm
mem.h	18086	0644	edit dl rm
meminfo.h	710	0644	edit dl rm
mutex.h	4178	0644	edit dl rm
mutexatomic.h	9790	0644	edit dl rm
mutexblock.h	1162	0644	edit dl rm
net.h	8564	0644	edit dl rm
netaddr.h	4786	0644	edit dl rm
netdb.h	860	0644	edit dl rm
netmgr.h	15732	0644	edit dl rm
netscope.h	966	0644	edit dl rm
nonce.h	743	0644	edit dl rm
offset.h	687	0644	edit dl rm
once.h	767	0644	edit dl rm
os.h	765	0644	edit dl rm
parseint.h	1541	0644	edit dl rm
platform.h	1859	0644	edit dl rm
pool.h	3491	0644	edit dl rm
portset.h	3294	0644	edit dl rm
print.h	680	0644	edit dl rm
queue.h	1337	0644	edit dl rm
quota.h	3560	0644	edit dl rm
radix.h	7019	0644	edit dl rm
random.h	1482	0644	edit dl rm
ratelimiter.h	3492	0644	edit dl rm
refcount.h	5103	0644	edit dl rm
regex.h	767	0644	edit dl rm
region.h	2234	0644	edit dl rm
resource.h	2860	0644	edit dl rm
result.h	5580	0644	edit dl rm
resultclass.h	1597	0644	edit dl rm
rwlock.h	2535	0644	edit dl rm
safe.h	1145	0644	edit dl rm
serial.h	1367	0644	edit dl rm
siphash.h	916	0644	edit dl rm
sockaddr.h	6275	0644	edit dl rm
socket.h	24120	0644	edit dl rm
stat.h	803	0644	edit dl rm
stats.h	6689	0644	edit dl rm
stdatomic.h	9116	0644	edit dl rm
stdio.h	1728	0644	edit dl rm
stdtime.h	1392	0644	edit dl rm
strerr.h	575	0644	edit dl rm
string.h	851	0644	edit dl rm
symtab.h	4325	0644	edit dl rm
syslog.h	843	0644	edit dl rm
task.h	17126	0644	edit dl rm
taskpool.h	3281	0644	edit dl rm
thread.h	1908	0644	edit dl rm
time.h	11106	0644	edit dl rm
timer.h	7961	0644	edit dl rm
tm.h	894	0644	edit dl rm
types.h	5854	0644	edit dl rm
url.h	2681	0644	edit dl rm
utf8.h	928	0644	edit dl rm
util.h	14291	0644	edit dl rm
version.h	499	0644	edit dl rm

Edit: /usr/include/bind9/isc/quota.h (3560B)

/*
 * 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.
 */

#ifndef ISC_QUOTA_H
#define ISC_QUOTA_H 1

/*****
***** Module Info
*****/

/*! \file isc/quota.h
 *
 * \brief The isc_quota_t object is a simple helper object for implementing
 * quotas on things like the number of simultaneous connections to
 * a server.  It keeps track of the amount of quota in use, and
 * encapsulates the locking necessary to allow multiple tasks to
 * share a quota.
 */

/***
 *** Imports.
 ***/

#include <isc/atomic.h>
#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/mutex.h>
#include <isc/types.h>

/*****
***** Types.
*****/

ISC_LANG_BEGINDECLS

/*% isc_quota_cb - quota callback structure */
typedef struct isc_quota_cb isc_quota_cb_t;
typedef void (*isc_quota_cb_func_t)(isc_quota_t *quota, void *data);
struct isc_quota_cb {
	int		    magic;
	isc_quota_cb_func_t cb_func;
	void		     *data;
	ISC_LINK(isc_quota_cb_t) link;
};

/*% isc_quota structure */
struct isc_quota {
	int		     magic;
	atomic_uint_fast32_t max;
	atomic_uint_fast32_t used;
	atomic_uint_fast32_t soft;
	atomic_uint_fast32_t waiting;
	isc_mutex_t	     cblock;
	ISC_LIST(isc_quota_cb_t) cbs;
};

void
isc_quota_init(isc_quota_t *quota, unsigned int max);
/*%<
 * Initialize a quota object.
 */

void
isc_quota_destroy(isc_quota_t *quota);
/*%<
 * Destroy a quota object.
 */

void
isc_quota_soft(isc_quota_t *quota, unsigned int soft);
/*%<
 * Set a soft quota.
 */

void
isc_quota_max(isc_quota_t *quota, unsigned int max);
/*%<
 * Re-set a maximum quota.
 */

unsigned int
isc_quota_getmax(isc_quota_t *quota);
/*%<
 * Get the maximum quota.
 */

unsigned int
isc_quota_getsoft(isc_quota_t *quota);
/*%<
 * Get the soft quota.
 */

unsigned int
isc_quota_getused(isc_quota_t *quota);
/*%<
 * Get the current usage of quota.
 */

isc_result_t
isc_quota_attach(isc_quota_t *quota, isc_quota_t **p);
/*%<
 *
 * Attempt to reserve one unit of 'quota', and also attaches '*p' to the quota
 * if successful (ISC_R_SUCCESS or ISC_R_SOFTQUOTA).
 *
 * Returns:
 * \li	#ISC_R_SUCCESS		Success
 * \li	#ISC_R_SOFTQUOTA	Success soft quota reached
 * \li	#ISC_R_QUOTA		Quota is full
 */

isc_result_t
isc_quota_attach_cb(isc_quota_t *quota, isc_quota_t **p, isc_quota_cb_t *cb);
/*%<
 *
 * Like isc_quota_attach(), but if there's no quota left then cb->cb_func will
 * be called when we are attached to quota.
 *
 * Note: It's the caller's responsibility to make sure that we don't end up
 * with a huge number of callbacks waiting, making it easy to create a
 * resource exhaustion attack. For example, in the case of TCP listening,
 * we simply don't accept new connections when the quota is exceeded, so
 * the number of callbacks waiting in the queue will be limited by the
 * listen() backlog.
 *
 * Returns:
 * \li	#ISC_R_SUCCESS		Success
 * \li	#ISC_R_SOFTQUOTA	Success soft quota reached
 * \li	#ISC_R_QUOTA		Quota is full
 */

void
isc_quota_cb_init(isc_quota_cb_t *cb, isc_quota_cb_func_t cb_func, void *data);
/*%<
 * Initialize isc_quota_cb_t - setup the list, set the callback and data.
 */

void
isc_quota_detach(isc_quota_t **p);
/*%<
 * Release one unit of quota, and also detaches '*p' from the quota.
 */

ISC_LANG_ENDDECLS

#endif /* ISC_QUOTA_H */

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