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diff --git a/include/cynara/cynara-client-async.h b/include/cynara/cynara-client-async.h new file mode 100644 index 0000000..78a1313 --- /dev/null +++ b/include/cynara/cynara-client-async.h @@ -0,0 +1,645 @@ +/* + * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd All Rights Reserved + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License + */ +/** + * @file src/include/cynara-client-async.h + * @author Zofia Abramowska <z.abramowska@samsung.com> + * @author Marcin Niesluchowski <m.niesluchow@samsung.com> + * @author Oskar Switalski <o.switalski@samsung.com> + * @version 1.0 + * @brief This file contains asynchronous client APIs of Cynara available + * with libcynara-client-asynchronous. + * @example cynara-client-async.example + */ + +#ifndef CYNARA_CLIENT_ASYNC_H +#define CYNARA_CLIENT_ASYNC_H + +#include <stddef.h> +#include <stdint.h> + +#include <cynara/cynara-error.h> +#include <cynara/cynara-limits.h> + +#ifdef __cplusplus +extern "C" { +#endif + +typedef uint16_t cynara_check_id; +typedef struct cynara_async cynara_async; +typedef struct cynara_async_configuration cynara_async_configuration; + +/** + * \enum cynara_async_status + * Values indicating the status of connected cynara socket. + * + * \var cynara_async_status::CYNARA_STATUS_FOR_READ + * Wait for read events on socket. + * + * \var cynara_async_status::CYNARA_STATUS_FOR_RW + * Wait for both read and write events on socket. + */ +typedef enum { + CYNARA_STATUS_FOR_READ, + CYNARA_STATUS_FOR_RW +} cynara_async_status; + +/** + * \enum cynara_async_call_cause + * Values indicating the reason of cynara_response_callback call. + * + * \var cynara_async_call_cause::CYNARA_CALL_CAUSE_ANSWER + * Callback was called due to response to previous cynara_async_create_request() or + * cynara_async_create_simple_request() call. + * + * \var cynara_async_call_cause::CYNARA_CALL_CAUSE_CANCEL + * Callback was called due to request cancellation with cynara_async_cancel_request() call. + * + * \var cynara_async_call_cause::CYNARA_CALL_CAUSE_FINISH + * Callback was called due to cynara_async_finish() call. + * + * \var cynara_async_call_cause::CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE + * Callback was called due to service not available. + */ +typedef enum { + CYNARA_CALL_CAUSE_ANSWER, + CYNARA_CALL_CAUSE_CANCEL, + CYNARA_CALL_CAUSE_FINISH, + CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE +} cynara_async_call_cause; + +/** + * \brief Response_callback is registered once in cynara_async_create_request() or + * cynara_async_create_simple_request() and will be triggered exactly once in 4 kinds of situations: + * + * -# after response is received from cynara service (CYNARA_CALL_CAUSE_ANSWER) + * -# when request is canceled with cynara_async_cancel_request() (CYNARA_CALL_CAUSE_CANCEL) + * -# when request was pending for response, but cynara_async_finish() was called + * (CYNARA_CALL_CAUSE_FINISH) + * -# when connection to cynara service was broken and cannot be established again - probably cynara + * is unoperational (CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE) + * + * API functions called during this callback with CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE + * or CYNARA_CALL_CAUSE_FINISH cause will return CYNARA_API_OPERATION_NOT_ALLOWED. + * cynara_async_finish() will be ignored if called from within this callback. + * + * \param[in] check_id Number identifying check request. Number is generated in + * cynara_async_create_request() or cynara_async_create_simple_request() + * and returned to user. It can be used to match response with sent request. + * Number is valid since cynara_async_create_request() call or + * cynara_async_create_simple_request() call till callback call. + * After that the number can be reused by cynara to run new request. + * \param[in] cause Cause of triggering this callback. + * \param[in] response Response for created request. Should be ignored if cause is not + * an answer to request (cause != CYNARA_CALL_CAUSE_ANSWER). + * \param[in] user_response_data User specific data - passed to cynara library in + * cynara_async_cancel_request() is being only remembered by library. + * Cynara library does not take any actions on this pointer, + * except for giving it back to user in cynara_response_callback. + * After that cynara forgets this data. + */ +typedef void (*cynara_response_callback) (cynara_check_id check_id, cynara_async_call_cause cause, + int response, void *user_response_data); + +/** + * \brief Callback used by cynara async API when status of cynara socket is changed in + * cynara_async_initialize(), cynara_async_check_cache(), cynara_async_create_request(), + * cynara_async_create_simple_request(), cynara_async_process(), cynara_async_cancel_request() + * or cynara_async_finish(). + * + * File descriptor changes every time cynara library connects or disconnects cynara service. + * Status change is triggered when check_request or cancel needs to be send to + * cynara service or sending data has finished and there is nothing more to send to cynara + * service. + * + * Note, that provided file descriptor is used internally by libcynara-client-async + * so user should not use it in other way than waiting on it in event loop. + * In particular user should not write to, read from or close this fd. + * CYNARA_API_OPERATION_NOT_ALLOWED will be returned for every api function called in this callback. + * cynara_async_finish() will be ignored if called from within this callback. + * + * \param[in] old_fd Old descriptor which should be unregistered from event loop, + * Special value -1 is used when callback is called after first + * successful connect. + * \param[in] new_fd New descriptor which should be registered in event loop, + * Special value -1 is used when cynara_async_finish() is called and + * cynara is disconnected. In this case status should be ignored. + * \param[in] status Status indicating which events should be awaited on socket + * \param[in] user_status_data User specific data - passed to cynara library in + * cynara_async_initialize() is being only remembered by library. + * Cynara library does not take any actions on this pointer, + * except for giving it back to user in cynara_status_callback. + * Data should be valid at least until cynara_async_finish() is called. + */ +typedef void (*cynara_status_callback) (int old_fd, int new_fd, cynara_async_status status, + void *user_status_data); + +/** + * \par Description: + * Initialize cynara_async_configuration. Create structure used in following configuration + * API calls. + * + * \par Purpose: + * For configuration parameter to be used in cynara async initialization function, this API must be + * called before any other cynara async configuration API function. + * It will create cynara_async_configuration structure, an optional parameter of cynara async + * initialization. + * + * \par Typical use case: + * Once before setting parameters of cynara async configuration and passing to + * cynara_async_initialize(). + * + * \par Method of function operation: + * This API initializes inner library structures and in case of success returns pointer + * to created cynara_async_configuration structure. + * + * \par Sync (or) Async: + * This as a synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * Structure cynara_async_configuration created by cynara_async_configuration_create() call + * should be released with cynara_async_configuration_destroy(). + * Structure cynara_async_configuration should be destroyed after passing it to + * cynara_async_initialize(). + * + * \param[out] pp_conf Placeholder for created cynara_async_configuration structure. + * + * \return CYNARA_API_SUCCESS on success + * \return negative error code on error + */ +int cynara_async_configuration_create(cynara_async_configuration **pp_conf); + +/** + * \par Description: + * Release cynara_async_configuration structure created with cynara_async_configuration_create(). + * + * \par Purpose: + * This API should be used to clean up after usage of cynara_async_configuration. + * + * \par Typical use case: + * Once cynara_async_configuration is not needed. + * + * \par Method of function operation: + * This API releases inner library structure and destroys cynara_async_configuration structure. + * + * \par Sync (or) Async: + * This is a synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \param[in] p_conf cynara_async_configuration structure. If NULL, the call has no effect. + */ +void cynara_async_configuration_destroy(cynara_async_configuration *p_conf); + +/** + * \par Description: + * Set client cache size. + * + * \par Purpose: + * This API is used to change default number of cached responses returned from cynara. + * + * \par Typical use case: + * Once before setting parameters of cynara async configuration and passing to + * cynara_async_initialize(). + * + * \par Method of function operation: + * This API initializes cache with given capacity. + * + * \par Sync (or) Async: + * This as a synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * After passing cynara_async_configuration to cynara_async_initialize() calling this API will have + * no effect. + * + * \param[in] p_conf cynara_async_configuration structure pointer. + * \param[in] cache_size Cache size to be set. + * + * \return CYNARA_API_SUCCESS on success + * \return negative error code on error + */ +int cynara_async_configuration_set_cache_size(cynara_async_configuration *p_conf, + size_t cache_size); + +/** + * \par Description: + * Initialize cynara-async-client library with given configuration. Create structure used in + * following API calls and register callback and user_status_data for + * further cynara async API calls. + * + * \par Purpose: + * This API must be used prior to calling any other cynara async API function. + * It will create cynara_async structure required for any other cynara async API calls. + * + * \par Typical use case: + * Once before entering event loop and before any other cynara async API is called. + * + * \par Method of function operation: + * This API initializes inner library structures and in case of success + * returns cynara_async structure. + * + * \par Sync (or) Async: + * This is an synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * Structure cynara_async created by cynara_async_initialize() call should be released + * with cynara_async_finish(). + * + * \param[out] pp_cynara Placeholder for created cynara_async structure. + * \param[in] p_conf Configuration for cynara-async-client library. + * NULL should be used for default configuration. + * Configuration management functions will be added later. + * Configuration will be able to specify e.g. size of cache used by library + * for holding checks results. + * \param[in] callback Function called when connection is started. + * If NULL, no callback will be called, when status changes. + * \param[in] user_status_data User specific data, passed to callback is being only remembered + * by library. Cynara library does not take any actions on this pointer, + * except for giving it back to user in cynara_status_callback. + * Data should be valid at least until cynara_async_finish() is called. + * Can be NULL. + * + * \return CYNARA_API_SUCCESS on success + * \return negative error code on error + */ +int cynara_async_initialize(cynara_async **pp_cynara, const cynara_async_configuration *p_conf, + cynara_status_callback callback, void *user_status_data); + +/** + * \par Description: + * Release cynara-async-client library and destroy structure created with cynara_async_initialize(). + * + * \par Purpose: + * This API should be used to clean up after usage of cynara-async-client library. + * + * \par Typical use case: + * Once after connection to cynara is not needed. + * + * \par Method of function operation: + * This API releases inner library structure and destroys cynara_async structure. Connection to + * cynara server is closed. Upon disconnecting this will trigger cynara_status_callback callback + * with -1 as new_fd param so client can unregister file descriptor connected with cynara. It will + * also trigger cynara_response_callback callback for each created request with + * cynara_async_call_cause::CYNARA_CALL_CAUSE_FINISH as cause param. + * + * \par Sync (or) Async: + * This is an asynchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * No other call to cynara-async-client library should be made after call to cynara_async_finish(). + * cynara_async_finish() called from within cynara_response_callback or cynara_status_callback will + * be ignored. + * + * \param[in] p_cynara cynara_async structure. If NULL, then the call has no effect. + */ +void cynara_async_finish(cynara_async *p_cynara); + +/** + * \par Description: + * Check access to given privilege for specified user, client and client_session in cache. + * + * \par Purpose: + * This API should be used to check if cache holds information about access of user, + * running application identified as clients to a privilege. + * This API should be used for fast check in cache. + * + * \par Typical use case: + * A service wants to check in cache, if a client requesting access to some privilege + * has proper rights. + * + * \par Method of function operation: + * Client (a process / application) requesting access to a privilege is running as some user. + * For such triple (client, user, privilege) a cache is checked. + * If cache is invalid it is cleared and call returns same as access not found. + * Additional parameter client_session + * may be used to distinguish between client session (e.g. for allowing access only for this + * particular application launch). Empty string "" can be used, when session differentiation + * is not needed. + * + * \par Sync (or) Async: + * This is an synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * \parblock + * Call to cynara_async_check_cache() needs cynara_async structure to be created first. + * Use cynara_async_initialize() before calling this function. cynara_async_check_cache() called + * from within cynara_status_callback or cynara_response_callback with + * CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE or CYNARA_CALL_CAUSE_FINISH cause will return + * CYNARA_API_OPERATION_NOT_ALLOWED. + * + * Socket status may occasionally be changed to CYNARA_STATUS_FOR_RW, to ensure + * that cynara_async_process() is triggered in event loop after socket is ready to send + * monitor logs to Cynara service. + * + * String length cannot exceed CYNARA_MAX_ID_LENGTH, otherwise CYNARA_API_INVALID_PARAM will be + * returned. + * \endparblock + * + * \param[in] p_cynara cynara_async structure. + * \param[in] client Application or process identifier. + * \param[in] client_session Client defined session. + * \param[in] user User of running client. + * \param[in] privilege Privilege that is a subject of a check. + * + * \return CYNARA_API_ACCESS_ALLOWED on checked access allowed + * \return CYNARA_API_ACCESS_DENIED on checked access denied + * \return CYNARA_API_CACHE_MISS on access not in cache + * \return other negative error code on error + */ +int cynara_async_check_cache(cynara_async *p_cynara, const char *client, const char *client_session, + const char *user, const char *privilege); + +/** + * \par Description: + * Creates access check request to cynara service for client, user accessing given privilege. + * Set callback and user_response_data to be called and passed when request processing is finished. + * + * \par Purpose: + * This API should be used to create check request for client identified by a triple + * (client, user, privilege) in custom defined session. + * Response can be received with cynara_async_process(). + * Check id is returned to pair request with response for canceling purposes. + * + * \par Typical use case: + * When cynara_async_check_cache() returned CYNARA_API_CACHE_MISS, so cynara service + * has to be asked, if a client requesting access to some privilege has proper rights. + * To receive matching response client sets callback and specifies arbitrary data to be passed + * to this callback. + * + * \par Method of function operation: + * \parblock + * Client (a process / application) requesting access to a privilege is running as some user. + * For such triple (client, user, privilege) a request event is created and added to pending + * requests for cynara_async_process() to process. + * + * Socket status will be changed to CYNARA_STATUS_FOR_RW, to ensure that cynara_async_process() + * will be triggered in event loop after socket is ready to send request to cynara service. + * After request is sent and there is nothing more to send to cynara service, status will change + * back to CYNARA_STATUS_FOR_READ. Status changes are delivered with cynara_status_callback. + * When function is successfully called unique check_id is returned. It is used for matching + * generated request with response, that will be received by registered callback. + * + * Because check_id is coded as 16-bit unsigned integer, there can be only 2^16 = 65536 pending + * requests. When response callback is called either because of getting answer or because + * of cancel check_id used for that request is released and can be reused by cynara library. + * When maximum of pending requests is reached cynara_async_create_request() fails with + * CYNARA_API_MAX_PENDING_REQUESTS error code. + * \endparblock + * + * \par Sync (or) Async: + * This is an asynchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * \parblock + * Call cynara_async_create_request() needs cynara_async structure to be created first with + * cynara_async_initialize(). + * Call cynara_async_cancel_request() to cancel pending request. + * Call cynara_async_process() to receive response. + * + * It is guaranteed that if cynara_async_create_request() function succeeds (CYNARA_API_SUCCESS) + * a callback will be called exactly once and that it will receive user_response_data. + * + * If function fails (returns negative error code) request won't be generated and won't be pending, + * callback function won't be ever called and user_response_data won't be remembered by library. + * + * Also no check_id will be generated and *p_check_id value should be ignored. + * cynara_async_create_request() called from within cynara_status_callback or + * cynara_response_callback with CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE or CYNARA_CALL_CAUSE_FINISH + * cause will return CYNARA_API_OPERATION_NOT_ALLOWED. + * + * String length cannot exceed CYNARA_MAX_ID_LENGTH ,otherwise CYNARA_API_INVALID_PARAM will be + * returned. + * \endparblock + * + * \param[in] p_cynara cynara_async structure. + * \param[in] client Application or process identifier. + * \param[in] client_session Client defined session. + * \param[in] user User of running client. + * \param[in] privilege Privilege that is a subject of a check. + * \param[out] p_check_id Placeholder for check id. If NULL, then no check_id is returned. + * \param[in] callback Function called when matching response is received. + * If NULL then no callback will be called when response, cancel, finish + * or service not availble error happens. + * \param[in] user_response_data User specific data, passed to callback is being only remembered + * by library. Cynara library does not take any actions on this pointer, + * except for giving it back to user in cynara_response_callback. + * Can be NULL. + * + * \return CYNARA_API_SUCCESS on success + * \return CYNARA_API_MAX_PENDING_REQUESTS on too much pending requests + * \return other negative error code on error + */ +int cynara_async_create_request(cynara_async *p_cynara, const char *client, + const char *client_session, const char *user, const char *privilege, + cynara_check_id *p_check_id, cynara_response_callback callback, + void *user_response_data); + +/** + * \par Description: + * Creates simple access check request to cynara service for (potential) permission to take some + * action or access a resource. + * Set callback and user_response_data to be called and passed when request processing is finished. + * + * \par Purpose: + * This API should be used for a quick check if a user running application identified as client + * has access to a given privilege. + * Response can be received with cynara_async_process(). + * Check id is returned to pair request with response for canceling purposes. + * + * \par Typical use case: + * An application may use this API to check if it has (potential) permission to take some action + * or access resource in future (permissions may rarely change). The typical use would be to disable + * or hide some of functionalities if they probably could not be used anyways. + * + * \par Method of function operation: + * \parblock + * This function is very similar to cynara_async_create_request() with the difference, that in case + * of answer not being one of CYNARA_API_PERMISSION_DENIED or CYNARA_API_PERMISSION_ALLOWED, + * no external application will be consulted. Instead, CYNARA_API_ACCESS_NOT_RESOLVED is returned + * by a callback, meaning, that only creating full request through cynara_async_create_request() API + * would yield eventual answer. + * + * If access permission cannot be acquired without usage of external agents, callback can be + * called with CYNARA_CALL_CAUSE_ANSWER and response value being CYNARA_API_ACCESS_NOT_RESOLVED. + * \endparblock + * + * \par Sync (or) Async: + * This is a synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into mutex protected critical section. + * + * \par Important notes: + * \parblock + * Call cynara_async_create_simple_request() needs cynara_async structure to be created first + * with cynara_async_initialize(). + * Call cynara_async_cancel_request() to cancel pending request. + * Call cynara_async_process() to send request and receive response. + * + * The answer will be taken from cynara's database without consulting any external applications. + * If the answer cannot be resolved in one of CYNARA_API_ACCESS_ALLOWED or + * CYNARA_API_ACCESS_DENIED without communicating with external application, response returned + * through callback will have value CYNARA_API_ACCESS_NOT_RESOLVED. + * + * String length cannot exceed CYNARA_MAX_ID_LENGTH, otherwise CYNARA_API_INVALID_PARAM will be + * returned. + * \endparblock + * + * \param[in] p_cynara cynara_async structure. + * \param[in] client Application or process identifier. + * \param[in] client_session Client defined session. + * \param[in] user User of running client. + * \param[in] privilege Privilege that is a subject of a check. + * \param[out] p_check_id Placeholder for check id. If NULL, then no check_id is returned. + * \param[in] callback Function called when matching response is received. + * If NULL then no callback will be called when response, cancel, finish + * or service not availble error happens. + * \param[in] user_response_data User specific data, passed to callback is being only stored by + * library. Cynara library does not take any actions on this pointer, except for giving + * it back to user in cynara_response_callback. + * Can be NULL. + * + * \return CYNARA_API_SUCCESS on success + * \return CYNARA_API_MAX_PENDING_REQUESTS on too much pending requests + * \return other negative error code on error + */ +int cynara_async_create_simple_request(cynara_async *p_cynara, const char *client, + const char *client_session, const char *user, + const char *privilege, cynara_check_id *p_check_id, + cynara_response_callback callback, void *user_response_data); + +/** + * \par Description: + * Process events that appeared on cynara socket. + * + * \par Purpose: + * Process events after they appear on cynara socket. + * + * \par Typical use case: + * After request was queued with cynara_async_create_request() or + * cynara_async_create_simple_request() this API will return response. + * When event loop will return readiness on cynara socket, client should use this API. + * + * \par Method of function operation: + * \parblock + * This API sends pending requests, receives all responses and reacts when cynara + * has disconnected. If cynara has disconnected all values in cache become invalid. During these + * operations status of cynara socket may change, so cynara_status_callback callback will be + * triggered to indicate these changes. cynara_response_callback callback will be triggered with + * cynara_async_call_cause::CYNARA_CALL_CAUSE_ANSWER as cause param when response is available. + * + * If cynara has disconnected it will be triggered with + * cynara_async_call_cause::CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE as cause param. + * \endparblock + * + * \par Sync (or) Async: + * This is an asynchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * Call to cynara_async_process() requires initialized cynara_async structure. For this use + * cynara_async_initialize(). cynara_async_process() called from within cynara_status_callback or + * cynara_response_callback with CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE or CYNARA_CALL_CAUSE_FINISH + * cause will return CYNARA_API_OPERATION_NOT_ALLOWED. + * + * \param[in] p_cynara cynara_async structure. + * + * \return CYNARA_API_SUCCESS on success + * \return negative error code on error + */ +int cynara_async_process(cynara_async *p_cynara); + +/** + * \par Description: + * Cancel request created by cynara_async_create_request() or cynara_async_create_simple_request(). + * + * \par Purpose: + * This API should be used to cancel pending check request, + * created by cynara_async_create_request() or cynara_async_create_simple_request(). + * + * \par Typical use case: + * When cynara client is no longer interested in receiving an answer. + * Same check_id value should be used to identify proper request as was generated during + * request creation with cynara_async_create_request() or cynara_async_create_simple_request(). + * + * \par Method of function operation: + * \parblock + * Cancels request created by cynara_async_create_request() or cynara_async_create_simple_request() + * call. + * + * cynara_status_callback callback may be triggered to be able to send cancel to cynara. + * cynara_response_callback callback will be triggered with with + * cynara_async_call_cause::CYNARA_CALL_CAUSE_CANCEL as cause param. + * + * If given id is not valid (was not requested or response callback was already delivered) + * cynara_async_cancel_request() returns CYNARA_API_INVALID_PARAM. + * \endparblock + * + * \par Sync (or) Async: + * This is a synchronous API. + * + * \par Thread-safety: + * This function is NOT thread-safe. If functions from described API are called by multithreaded + * application from different threads, they must be put into protected critical section. + * + * \par Important notes: + * Call to cynara_async_cancel_request() needs cynara_async structure to be created first. For this + * use cynara_async_initialize(). cynara_async_cancel_request() called from within + * cynara_status_callback or cynara_response_callback with CYNARA_CALL_CAUSE_SERVICE_NOT_AVAILABLE + * or CYNARA_CALL_CAUSE_FINISH cause will return CYNARA_API_OPERATION_NOT_ALLOWED. + * + * \param[in] p_cynara cynara_async structure. + * \param[in] check_id Check id to be cancelled + * + * \return CYNARA_API_SUCCESS on success + * \return negative error code on error + */ +int cynara_async_cancel_request(cynara_async *p_cynara, cynara_check_id check_id); + +#ifdef __cplusplus +} +#endif + +#endif /* CYNARA_CLIENT_ASYNC_H */ |