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aes.h	1015 B	-rw-r--r--
align.h	569 B	-rw-r--r--
app.h	6.97 KB	-rw-r--r--
assertions.h	2.17 KB	-rw-r--r--
astack.h	1.11 KB	-rw-r--r--
atomic.h	3.01 KB	-rw-r--r--
backtrace.h	3.8 KB	-rw-r--r--
barrier.h	1.03 KB	-rw-r--r--
base32.h	4.35 KB	-rw-r--r--
base64.h	2.8 KB	-rw-r--r--
bind9.h	829 B	-rw-r--r--
buffer.h	29.91 KB	-rw-r--r--
bufferlist.h	1.42 KB	-rw-r--r--
cmocka.h	1.35 KB	-rw-r--r--
commandline.h	1.67 KB	-rw-r--r--
condition.h	1.87 KB	-rw-r--r--
counter.h	1.88 KB	-rw-r--r--
crc64.h	998 B	-rw-r--r--
deprecated.h	662 B	-rw-r--r--
dir.h	1.51 KB	-rw-r--r--
endian.h	4.75 KB	-rw-r--r--
errno.h	659 B	-rw-r--r--
errno2result.h	901 B	-rw-r--r--
error.h	1.4 KB	-rw-r--r--
event.h	3.36 KB	-rw-r--r--
eventclass.h	1.41 KB	-rw-r--r--
file.h	11.4 KB	-rw-r--r--
formatcheck.h	940 B	-rw-r--r--
fsaccess.h	7.28 KB	-rw-r--r--
fuzz.h	593 B	-rw-r--r--
hash.h	1.61 KB	-rw-r--r--
heap.h	5.14 KB	-rw-r--r--
hex.h	2.74 KB	-rw-r--r--
hmac.h	3.88 KB	-rw-r--r--
hp.h	4.48 KB	-rw-r--r--
ht.h	4.38 KB	-rw-r--r--
httpd.h	2.24 KB	-rw-r--r--
interfaceiter.h	3.07 KB	-rw-r--r--
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lang.h	686 B	-rw-r--r--
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lib.h	1.13 KB	-rw-r--r--
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log.h	25.88 KB	-rw-r--r--
magic.h	999 B	-rw-r--r--
managers.h	776 B	-rw-r--r--
md.h	5.63 KB	-rw-r--r--
mem.h	17.66 KB	-rw-r--r--
meminfo.h	710 B	-rw-r--r--
mutex.h	4.08 KB	-rw-r--r--
mutexatomic.h	9.56 KB	-rw-r--r--
mutexblock.h	1.13 KB	-rw-r--r--
net.h	8.36 KB	-rw-r--r--
netaddr.h	4.67 KB	-rw-r--r--
netdb.h	860 B	-rw-r--r--
netmgr.h	15.36 KB	-rw-r--r--
netscope.h	966 B	-rw-r--r--
nonce.h	743 B	-rw-r--r--
offset.h	687 B	-rw-r--r--
once.h	767 B	-rw-r--r--
os.h	765 B	-rw-r--r--
parseint.h	1.5 KB	-rw-r--r--
platform.h	1.82 KB	-rw-r--r--
pool.h	3.41 KB	-rw-r--r--
portset.h	3.22 KB	-rw-r--r--
print.h	680 B	-rw-r--r--
queue.h	1.31 KB	-rw-r--r--
quota.h	3.48 KB	-rw-r--r--
radix.h	6.85 KB	-rw-r--r--
random.h	1.45 KB	-rw-r--r--
ratelimiter.h	3.41 KB	-rw-r--r--
refcount.h	4.98 KB	-rw-r--r--
regex.h	767 B	-rw-r--r--
region.h	2.18 KB	-rw-r--r--
resource.h	2.79 KB	-rw-r--r--
result.h	5.45 KB	-rw-r--r--
resultclass.h	1.56 KB	-rw-r--r--
rwlock.h	2.48 KB	-rw-r--r--
safe.h	1.12 KB	-rw-r--r--
serial.h	1.33 KB	-rw-r--r--
siphash.h	916 B	-rw-r--r--
sockaddr.h	6.13 KB	-rw-r--r--
socket.h	23.55 KB	-rw-r--r--
stat.h	803 B	-rw-r--r--
stats.h	6.53 KB	-rw-r--r--
stdatomic.h	8.9 KB	-rw-r--r--
stdio.h	1.69 KB	-rw-r--r--
stdtime.h	1.36 KB	-rw-r--r--
strerr.h	575 B	-rw-r--r--
string.h	851 B	-rw-r--r--
symtab.h	4.22 KB	-rw-r--r--
syslog.h	843 B	-rw-r--r--
task.h	16.72 KB	-rw-r--r--
taskpool.h	3.2 KB	-rw-r--r--
thread.h	1.86 KB	-rw-r--r--
time.h	10.85 KB	-rw-r--r--
timer.h	7.77 KB	-rw-r--r--
tm.h	894 B	-rw-r--r--
types.h	5.72 KB	-rw-r--r--
url.h	2.62 KB	-rw-r--r--
utf8.h	928 B	-rw-r--r--
util.h	13.96 KB	-rw-r--r--
version.h	499 B	-rw-r--r--

Code Editor : app.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.
 */

#ifndef ISC_APP_H
#define ISC_APP_H 1

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

/*! \file isc/app.h
 * \brief ISC Application Support
 *
 * Dealing with program termination can be difficult, especially in a
 * multithreaded program.  The routines in this module help coordinate
 * the shutdown process.  They are used as follows by the initial (main)
 * thread of the application:
 *
 *\li		isc_app_start();	Call very early in main(), before
 *					any other threads have been created.
 *
 *\li		isc_app_run();		This will post any on-run events,
 *					and then block until application
 *					shutdown is requested.  A shutdown
 *					request is made by calling
 *					isc_app_shutdown(), or by sending
 *					SIGINT or SIGTERM to the process.
 *					After isc_app_run() returns, the
 *					application should shutdown itself.
 *
 *\li		isc_app_finish();	Call very late in main().
 *
 * Applications that want to use SIGHUP/isc_app_reload() to trigger reloading
 * should check the result of isc_app_run() and call the reload routine if
 * the result is ISC_R_RELOAD.  They should then call isc_app_run() again
 * to resume waiting for reload or termination.
 *
 * Use of this module is not required.  In particular, isc_app_start() is
 * NOT an ISC library initialization routine.
 *
 * This module also supports per-thread 'application contexts'.  With this
 * mode, a thread-based application will have a separate context, in which
 * it uses other ISC library services such as tasks or timers.  Signals are
 * not caught in this mode, so that the application can handle the signals
 * in its preferred way.
 *
 * \li MP:
 *	Clients must ensure that isc_app_start(), isc_app_run(), and
 *	isc_app_finish() are called at most once.  isc_app_shutdown()
 *	is safe to use by any thread (provided isc_app_start() has been
 *	called previously).
 *
 *	The same note applies to isc_app_ctxXXX() functions, but in this case
 *	it's a per-thread restriction.  For example, a thread with an
 *	application context must ensure that isc_app_ctxstart() with the
 *	context is called at most once.
 *
 * \li Reliability:
 *	No anticipated impact.
 *
 * \li Resources:
 *	None.
 *
 * \li Security:
 *	No anticipated impact.
 *
 * \li Standards:
 *	None.
 */

#include <stdbool.h>

#include <isc/eventclass.h>
#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/result.h>

/***
 *** Types
 ***/

typedef isc_event_t isc_appevent_t;

#define ISC_APPEVENT_FIRSTEVENT (ISC_EVENTCLASS_APP + 0)
#define ISC_APPEVENT_SHUTDOWN	(ISC_EVENTCLASS_APP + 1)
#define ISC_APPEVENT_LASTEVENT	(ISC_EVENTCLASS_APP + 65535)

ISC_LANG_BEGINDECLS

isc_result_t
isc_app_ctxstart(isc_appctx_t *ctx);

isc_result_t
isc_app_start(void);
/*!<
 * \brief Start an ISC library application.
 *
 * Notes:
 *	This call should be made before any other ISC library call, and as
 *	close to the beginning of the application as possible.
 *
 * Requires:
 *\li	'ctx' is a valid application context (for app_ctxstart()).
 */

isc_result_t
isc_app_ctxonrun(isc_appctx_t *ctx, isc_mem_t *mctx, isc_task_t *task,
		 isc_taskaction_t action, void *arg);
isc_result_t
isc_app_onrun(isc_mem_t *mctx, isc_task_t *task, isc_taskaction_t action,
	      void *arg);
/*!<
 * \brief Request delivery of an event when the application is run.
 *
 * Requires:
 *\li	isc_app_start() has been called.
 *\li	'ctx' is a valid application context (for app_ctxonrun()).
 *
 * Returns:
 *	ISC_R_SUCCESS
 *	ISC_R_NOMEMORY
 */

isc_result_t
isc_app_ctxrun(isc_appctx_t *ctx);

isc_result_t
isc_app_run(void);
/*!<
 * \brief Run an ISC library application.
 *
 * Notes:
 *\li	The caller (typically the initial thread of an application) will
 *	block until shutdown is requested.  When the call returns, the
 *	caller should start shutting down the application.
 *
 * Requires:
 *\li	isc_app_[ctx]start() has been called.
 *
 * Ensures:
 *\li	Any events requested via isc_app_onrun() will have been posted (in
 *	FIFO order) before isc_app_run() blocks.
 *\li	'ctx' is a valid application context (for app_ctxrun()).
 *
 * Returns:
 *\li	ISC_R_SUCCESS			Shutdown has been requested.
 *\li	ISC_R_RELOAD			Reload has been requested.
 */

bool
isc_app_isrunning(void);
/*!<
 * \brief Return if the ISC library application is running.
 *
 * Returns:
 *\li	true    App is running.
 *\li	false   App is not running.
 */

void
isc_app_ctxshutdown(isc_appctx_t *ctx);

void
isc_app_shutdown(void);
/*!<
 * \brief Request application shutdown.
 *
 * Notes:
 *\li	It is safe to call isc_app_shutdown() multiple times.  Shutdown will
 *	only be triggered once.
 *
 * Requires:
 *\li	isc_app_[ctx]run() has been called.
 *\li	'ctx' is a valid application context (for app_ctxshutdown()).
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_UNEXPECTED
 */

void
isc_app_ctxsuspend(isc_appctx_t *ctx);
/*!<
 * \brief This has the same behavior as isc_app_ctxsuspend().
 */

void
isc_app_reload(void);
/*!<
 * \brief Request application reload.
 *
 * Requires:
 *\li	isc_app_run() has been called.
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_UNEXPECTED
 */

void
isc_app_ctxfinish(isc_appctx_t *ctx);

void
isc_app_finish(void);
/*!<
 * \brief Finish an ISC library application.
 *
 * Notes:
 *\li	This call should be made at or near the end of main().
 *
 * Requires:
 *\li	isc_app_start() has been called.
 *\li	'ctx' is a valid application context (for app_ctxfinish()).
 *
 * Ensures:
 *\li	Any resources allocated by isc_app_start() have been released.
 */

void
isc_app_block(void);
/*!<
 * \brief Indicate that a blocking operation will be performed.
 *
 * Notes:
 *\li	If a blocking operation is in process, a call to isc_app_shutdown()
 *	or an external signal will abort the program, rather than allowing
 *	clean shutdown.  This is primarily useful for reading user input.
 *
 * Requires:
 * \li	isc_app_start() has been called.
 * \li	No other blocking operations are in progress.
 */

void
isc_app_unblock(void);
/*!<
 * \brief Indicate that a blocking operation is complete.
 *
 * Notes:
 * \li	When a blocking operation has completed, return the program to a
 * 	state where a call to isc_app_shutdown() or an external signal will
 * 	shutdown normally.
 *
 * Requires:
 * \li	isc_app_start() has been called.
 * \li	isc_app_block() has been called by the same thread.
 */

isc_result_t
isc_appctx_create(isc_mem_t *mctx, isc_appctx_t **ctxp);
/*!<
 * \brief Create an application context.
 *
 * Requires:
 *\li	'mctx' is a valid memory context.
 *\li	'ctxp' != NULL && *ctxp == NULL.
 */

void
isc_appctx_destroy(isc_appctx_t **ctxp);
/*!<
 * \brief Destroy an application context.
 *
 * Requires:
 *\li	'*ctxp' is a valid application context.
 *
 * Ensures:
 *\li	*ctxp == NULL.
 */

ISC_LANG_ENDDECLS

#endif /* ISC_APP_H */

${this.title}

Code Editor : app.h