typedef struct afb_api_x3 afb_api_t;

typedef struct afb_binding_v3 afb_binding_t;

/**
 * Description of the bindings of type version 3
 */
struct afb_binding_v3
{
    /** api name for the binding, can't be NULL */
    const char *api;

    /** textual specification of the binding, can be NULL */
    const char *specification;

    /** some info about the api, can be NULL */
    const char *info;

    /** array of descriptions of verbs terminated by a NULL name, can be NULL */
    const struct afb_verb_v3 *verbs;

    /** callback at load of the binding */
    int (*preinit)(struct afb_api_x3 *api);

    /** callback for starting the service */
    int (*init)(struct afb_api_x3 *api);

    /** callback for handling events */
    void (*onevent)(struct afb_api_x3 *api, const char *event, struct json_object *object);

    /** userdata for afb_api_x3 */
    void *userdata;

    /** space separated list of provided class(es) */
    const char *provide_class;

    /** space separated list of required class(es) */
    const char *require_class;

    /** space separated list of required API(es) */
    const char *require_api;

    /** avoids concurrent requests to verbs */
    unsigned noconcurrency: 1;
};

typedef struct afb_verb_v3 afb_verb_t;

/**
 * Description of one verb as provided for binding API version 3
 */
struct afb_verb_v3
{
    /** name of the verb, NULL only at end of the array */
    const char *verb;

    /** callback function implementing the verb */
    void (*callback)(afb_req_t_x2 *req);

    /** required authorization, can be NULL */
    const struct afb_auth *auth;

    /** some info about the verb, can be NULL */
    const char *info;

    /**< data for the verb callback */
    void *vcbdata;

    /** authorization and session requirements of the verb */
    uint16_t session;

    /** is the verb glob name */
    uint16_t glob: 1;
};

typedef struct afb_auth afb_auth_t;

/**
 * Definition of an authorization entry
 */
struct afb_auth
{
    /** type of entry @see afb_auth_type */
    enum afb_auth_type type;

    union {
        /** text when @ref type == @ref afb_auth_Permission */
        const char *text;

        /** level of assurancy when @ref type ==  @ref afb_auth_LOA */
        unsigned loa;

        /** first child when @ref type in { @ref afb_auth_Or, @ref afb_auth_And, @ref afb_auth_Not } */
        const struct afb_auth *first;
    };

    /** second child when @ref type in { @ref afb_auth_Or, @ref afb_auth_And } */
    const struct afb_auth *next;
};

typedef enum afb_auth_type afb_auth_type_t;

/**
 * Enumeration  for authority (Session/Token/Assurance) definitions.
 *
 * @see afb_auth
 */
enum afb_auth_type
{
    /** never authorized, no data */
    afb_auth_No = 0,

    /** authorized if token valid, no data */
    afb_auth_Token,

    /** authorized if LOA greater than or equal to data 'loa' */
    afb_auth_LOA,

    /** authorized if permission 'text' is granted */
    afb_auth_Permission,

    /** authorized if 'first' or 'next' is authorized */
    afb_auth_Or,

    /** authorized if 'first' and 'next' are authorized */
    afb_auth_And,

    /** authorized if 'first' is not authorized */
    afb_auth_Not,

    /** always authorized, no data */
    afb_auth_Yes
};

static const afb_auth_t myauth[] = {
    { .type = afb_auth_Permission, .text = "urn:AGL:permission:me:public:set" },
    { .type = afb_auth_Permission, .text = "urn:AGL:permission:me:public:get" },
    { .type = afb_auth_Or, .first = &myauth[1], .next = &myauth[0] }
};

AFB_API_ERROR(api,fmt,...)
AFB_API_WARNING(api,fmt,...)
AFB_API_NOTICE(api,fmt,...)
AFB_API_INFO(api,fmt,...)
AFB_API_DEBUG(api,fmt,...)

AFB_REQ_ERROR(req,fmt,...)
AFB_REQ_WARNING(req,fmt,...)
AFB_REQ_NOTICE(req,fmt,...)
AFB_REQ_INFO(req,fmt,...)
AFB_REQ_DEBUG(req,fmt,...)

AFB_ERROR(fmt,...)
AFB_WARNING(fmt,...)
AFB_NOTICE(fmt,...)
AFB_INFO(fmt,...)
AFB_DEBUG(fmt,...)

/**
 * Get the name of the 'api'.
 *
 * @param api the api whose name is to be returned
 *
 * @return the name of the api.
 *
 * The returned value must not be changed nor freed.
 */
const char *afb_api_name(
            afb_api_t api);

/**
 * Get the "userdata" pointer of the 'api'
 *
 * @param api the api whose user's data is to be returned
 *
 * @return the user's data  pointer of the api.
 *
 * @see afb_api_set_userdata
 */
void *afb_api_get_userdata(
            afb_api_t api);

/**
 * Set the "userdata" pointer of the 'api' to 'value'
 *
 * @param api   the api whose user's data is to be set
 * @param value the data to set
 *
 * @see afb_api_get_userdata
 */
void afb_api_set_userdata(
            afb_api_t api,
            void *value);

/**
 * Check that it requires the API of 'name'.
 * If 'initialized' is not zero it requests the API to be
 * initialized, implying its initialization if needed.
 *
 * Calling this function is only allowed within init.
 *
 * A single request allows to require multiple apis.
 *
 * @param api the api that requires the other api by its name
 * @param name a space separated list of required api names
 * @param initialized if zero, the api is just required to exist. If not zero,
 * the api is required to exist and to be initialized at return of the call
 * (initializing it if needed and possible as a side effect of the call).
 *
 * @return 0 in case of success or -1 in case of error with errno set appropriately.
 */
int afb_api_require_api(
            afb_api_t api,
            const char *name,
            int initialized);

/**
 * Is the log message of 'level (as defined for syslog) required for the api?
 *
 * @param api   the api to check
 * @param level the level to check as defined for syslog:
 *
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @return 0 if not required or a value not null if required
 *
 * @see syslog
 */
int afb_api_wants_log_level(
            afb_api_t api,
            int level);

/**
 * Send to the journal with the logging 'level' a message described
 * by 'fmt' applied to the va-list 'args'.
 *
 * 'file', 'line' and 'func' are indicators of code position in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param api the api that collects the logging message
 * @param level the level of the message
 * @param file the source file that logs the messages or NULL
 * @param line the line in the source file that logs the message
 * @param func the name of the function in the source file that logs
 * @param fmt the format of the message as in printf
 * @param args the arguments to the format string of the message as a va_list
 *
 * @see syslog
 * @see printf
 */
void afb_api_vverbose(
            afb_api_t api,
            int level,
            const char *file,
            int line,
            const char *func,
            const char *fmt,
            va_list args);

/**
 * Send to the journal with the log 'level' a message described
 * by 'fmt' and following parameters.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param api the api that collects the logging message
 * @param level the level of the message
 * @param file the source file that logs the messages or NULL
 * @param line the line in the source file that logs the message
 * @param func the name of the function in the source file that logs
 * @param fmt the format of the message as in printf
 * @param ... the arguments to the format string of the message
 *
 * @see syslog
 * @see printf
 */
void afb_api_verbose(
            afb_api_t api,
            int level,
            const char *file,
            int line,
            const char *func,
            const char *fmt,
            ...);

/**
 * Get the root directory file descriptor. This file descriptor can
 * be used with functions 'openat', 'fstatat', ...
 *
 * CAUTION, manipulate this descriptor with care, in particular, don't close
 * it.
 *
 * This can be used to get the path of the root directory using:
 *
 * char buffer[MAX_PATH], proc[100];
 * int dirfd = afb_api_rootdir_get_fd(api);
 * snprintf(proc, sizeof proc, "/proc/self/fd/%d", dirfd);
 * readlink(proc, buffer, sizeof buffer);
 *
 * But note that within AGL this is the value given by the environment variable
 * AFM_APP_INSTALL_DIR.
 *
 * @param api the api that uses the directory file descriptor
 *
 * @return the file descriptor of the root directory.
 *
 * @see afb_api_rootdir_open_locale
 */
int afb_api_rootdir_get_fd(
            afb_api_t api);

/**
 * Opens 'filename' within the root directory with 'flags' (see function openat)
 * using the 'locale' definition (example: "jp,en-US") that can be NULL.
 *
 * The filename must be relative to the root of the bindings.
 *
 * The opening mode must be for read or write but not for O_CREAT.
 *
 * The definition of locales and of how files are searched can be checked
 * here: https://www.w3.org/TR/widgets/#folder-based-localization
 * and https://tools.ietf.org/html/rfc7231#section-5.3.5
 *
 * @param api the api that queries the file
 * @param filename the relative path to the file to open
 * @param flags the flags for opening as for C function 'open'
 * @param locale string indicating how to search content, can be NULL
 *
 * @return the file descriptor or -1 in case of error and errno is set with the
 * error indication.
 *
 * @see open
 * @see afb_api_rootdir_get_fd
 */
int afb_api_rootdir_open_locale(
            afb_api_t api,
            const char *filename,
            int flags,
            const char *locale);

/**
 * Settings of the api.
 *
 * Get the settings of the API. The settings are recorded
 * as a JSON object. The returned object should not be modified.
 * It MUST NOT be released using json_object_put.
 *
 * @param api the api whose settings are required
 *
 * @returns The setting object.
 */
struct json_object *afb_api_settings(
            struct afb_api_x3 *api);

/**
 * Calls the 'verb' of the 'apiname' with the arguments 'args' and 'verb' in the name of the binding 'api'.
 * The result of the call is delivered to the 'callback' function with the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 5 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'object'  a JSON object returned (can be NULL)
 *  3. 'error'   a string not NULL in case of error but NULL on success
 *  4. 'info'    a string handling some info (can be NULL)
 *  5. 'api'     the api
 *
 * NOTE: For convenience, *json_object_put* is called on 'object' after the
 * callback returns. So, it is wrong to call *json_object_put* in the callback.
 *
 * @param api      The api that makes the call
 * @param apiname  The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 * @see afb_api_call_sync
 */
void afb_api_call(
            afb_api_t api,
            const char *apiname,
            const char *verb,
            struct json_object *args,
            void (*callback)(
                    void *closure,
                    struct json_object *object,
                    const char *error,
                    const char * info,
                    afb_api_t api),
            void *closure);

/**
 * Calls the 'verb' of the 'apiname' with the arguments 'args' and 'verb' in the name of the binding 'api'.
 * 'result' will receive the response.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param api      The api that makes the call
 * @param apiname  The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param object   Where to store the returned object - should call json_object_put on it - can be NULL
 * @param error    Where to store the copied returned error - should call free on it - can be NULL
 * @param info     Where to store the copied returned info - should call free on it - can be NULL
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 * @see afb_api_call
 */
int afb_api_call_sync(
            afb_api_t api,
            const char *apiname,
            const char *verb,
            struct json_object *args,
            struct json_object **object,
            char **error,
            char **info);

/**
 * Queue the job defined by 'callback' and 'argument' for being executed asynchronously
 * in this thread (later) or in an other thread.
 *
 * If 'group' is not NULL, the jobs queued with a same value (as the pointer value 'group')
 * are executed in sequence in the order of there submission.
 *
 * If 'timeout' is not 0, it represent the maximum execution time for the job in seconds.
 * At first, the job is called with 0 as signum and the given argument.
 *
 * The job is executed with the monitoring of its time and some signals like SIGSEGV and
 * SIGFPE. When a such signal is catched, the job is terminated and reexecuted but with
 * signum being the signal number (SIGALRM when timeout expired).
 *
 * When executed, the callback function receives 2 arguments:
 *
 *  - int signum: the signal catched if any or zero at the beginning
 *  - void *arg: the parameter 'argument'
 *
 * A typical implementation of the job callback is:
 *
 * void my_job_cb(int signum, void *arg)
 * {
 *  struct myarg_t *myarg = arg;
 *  if (signum)
 *      AFB_API_ERROR(myarg->api, "job interrupted with signal %s", strsignal(signum));
 *  else
 *      really_do_my_job(myarg);
 * }
 *
 * @param api the api that queue the job
 * @param callback the job as a callback function
 * @param argument the argument to pass to the queued job
 * @param group the group of the job, NULL if no group
 * @param timeout the timeout of execution of the job
 *
 * @return 0 in case of success or -1 in case of error with errno set appropriately.
 */
int afb_api_queue_job(
            afb_api_t api,
            void (*callback)(int signum, void *arg),
            void *argument,
            void *group,
            int timeout);

/**
 * Broadcasts widely the event of 'name' with the data 'object'.
 * 'object' can be NULL.
 *
 * For convenience, the function calls 'json_object_put' for 'object'.
 * Thus, in the case where 'object' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * Calling this function is only forbidden during preinit.
 *
 * The event sent as the name API/name where API is the name of the
 * api.
 *
 * @param api the api that broadcast the event
 * @param name the event name suffix
 * @param object the object that comes with the event
 *
 * @return 0 in case of success or -1 in case of error
 */
int afb_api_broadcast_event(
            afb_api_t api,
            const char *name,
            struct json_object *object);

/**
 * Creates an event of 'name' and returns it.
 *
 * Calling this function is only forbidden during preinit.
 *
 * See afb_event_is_valid to check if there is an error.
 *
 * The event created as the name API/name where API is the name of the
 * api.
 *
 * @param api the api that creates the event
 * @param name the event name suffix
 *
 * @return the created event. Use the function afb_event_is_valid to check
 * whether the event is valid (created) or not (error as reported by errno).
 *
 * @see afb_event_is_valid
 */
afb_event_t afb_api_make_event(
            afb_api_t api,
            const char *name);

/**
 * Add a specific event handler for the api
 *
 * The handler callback is called when an event matching the given pattern
 * is received (it is received if broadcasted or after subscription through
 * a call or a subcall).
 *
 * The handler callback receive 4 arguments:
 *
 *  - the closure given here
 *  - the event full name
 *  - the companion JSON object of the event
 *  - the api that subscribed the event
 *
 * @param api the api that creates the handler
 * @param pattern the global pattern of the event to handle
 * @param callback the handler callback function
 * @param closure the closure of the handler
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_api_on_event
 * @see afb_api_event_handler_del
 */
int afb_api_event_handler_add(
            afb_api_t api,
            const char *pattern,
            void (*callback)(
                    void *,
                    const char*,
                    struct json_object*,
                    afb_api_t),
            void *closure);

/**
 * Delete a specific event handler for the api
 *
 * @param api the api that the handler belongs to
 * @param pattern the global pattern of the handler to remove
 * @param closure if not NULL it will receive the closure set to the handler
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_api_on_event
 * @see afb_api_event_handler_add
 */
int afb_api_event_handler_del(
            afb_api_t api,
            const char *pattern,
            void **closure);

/**
 * Retrieves the common systemd's event loop of AFB
 *
 * @param api the api that uses the event loop
 *
 * @return the systemd event loop if active, NULL otherwise
 *
 * @see afb_api_get_user_bus
 * @see afb_api_get_system_bus
 */
struct sd_event *afb_api_get_event_loop(
            afb_api_t api);

/**
 * Retrieves the common systemd's user/session d-bus of AFB
 *
 * @param api the api that uses the user dbus
 *
 * @return the systemd user connection to dbus if active, NULL otherwise
 *
 * @see afb_api_get_event_loop
 * @see afb_api_get_system_bus
 */
struct sd_bus *afb_api_get_user_bus(
            afb_api_t api);

/**
 * Retrieves the common systemd's system d-bus of AFB
 *
 * @param api the api that uses the system dbus
 *
 * @return the systemd system connection to dbus if active, NULL otherwise
 *
 * @see afb_api_get_event_loop
 * @see afb_api_get_user_bus
 */
struct sd_bus *afb_api_get_system_bus(
            afb_api_t api);

/**
 * Creates a new api of name 'apiname' briefly described by 'info' (that can
 * be NULL).
 *
 * When the pre-initialization function is given, it is a function that
 * receives 2 parameters:
 *
 *  - the closure as given in the call
 *  - the created api that can be initialised
 *
 * This pre-initialization function must return a negative value to abort
 * the creation of the api. Otherwise, it returns a non-negative value to
 * continue.
 *
 * @param api the api that creates the other one
 * @param apiname the name of the new api
 * @param info the brief description of the new api (can be NULL)
 * @param noconcurrency zero or not zero whether the new api is reentrant or not
 * @param preinit the pre-initialization function if any (can be NULL)
 * @param closure the closure for the pre-initialization preinit
 *
 * @return the created api in case of success or NULL on error
 *
 * @see afb_api_delete_api
 */
afb_api_t afb_api_new_api(
            afb_api_t api,
            const char *apiname,
            const char *info,
            int noconcurrency,
            int (*preinit)(void*, afb_api_t ),
            void *closure);

/**
 * @deprecated use @ref afb_api_set_verbs_v3 instead
 *
 * Set the verbs of the 'api' using description of verbs of the api v2
 *
 * @param api the api that will get the verbs
 * @param verbs the array of verbs to add terminated with an item with name=NULL
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_verb_v2
 * @see afb_api_add_verb
 * @see afb_api_set_verbs_v3
 */
int afb_api_set_verbs_v2(
            afb_api_t api,
            const struct afb_verb_v2 *verbs);

/**
 * Set the verbs of the 'api' using description of verbs of the api v2
 *
 * @param api the api that will get the verbs
 * @param verbs the array of verbs to add terminated with an item with name=NULL
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_verb_v3
 * @see afb_api_add_verb
 * @see afb_api_del_verb
 */
int afb_api_set_verbs_v3(
            afb_api_t api,
            const struct afb_verb_v3 *verbs);

/**
 * Add one verb to the dynamic set of the api
 *
 * @param api the api to change
 * @param verb name of the verb
 * @param info brief description of the verb, can be NULL
 * @param callback callback function implementing the verb
 * @param vcbdata data for the verb callback, available through req
 * @param auth required authorization, can be NULL
 * @param session authorization and session requirements of the verb
 * @param glob is the verb glob name
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_verb_v3
 * @see afb_api_del_verb
 * @see afb_api_set_verbs_v3
 * @see fnmatch for matching names using glob
 */
int afb_api_add_verb(
            afb_api_t api,
            const char *verb,
            const char *info,
            void (*callback)(struct afb_req_x2 *req),
            void *vcbdata,
            const struct afb_auth *auth,
            uint32_t session,
            int glob);

/**
 * Delete one verb from the dynamic set of the api
 *
 * @param api the api to change
 * @param verb name of the verb to delete
 * @param vcbdata if not NULL will receive the vcbdata of the deleted verb
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afb_api_add_verb
 */
int afb_api_del_verb(
            afb_api_t api,
            const char *verb,
            void **vcbdata);

/**
 * Set the callback 'onevent' to process events in the name of the 'api'.
 *
 * This setting can be done statically using the global variable
 * @ref afbBindingV3.
 *
 * This function replace any previously global event callback set.
 *
 * When an event is received, the callback 'onevent' is called with 3 parameters
 *
 *  - the api that recorded the event handler
 *  - the full name of the event
 *  - the companion JSON object of the event
 *
 * @param api the api that wants to process events
 * @param onevent the callback function that will process events (can be NULL
 *        to remove event callback)
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afbBindingV3
 * @see afb_binding_v3
 * @see afb_api_event_handler_add
 * @see afb_api_event_handler_del
 */
int afb_api_on_event(
            afb_api_t api,
            void (*onevent)(
                    afb_api_t api,
                    const char *event,
                    struct json_object *object));

/**
 * Set the callback 'oninit' to process initialization of the 'api'.
 *
 * This setting can be done statically using the global variable
 * @ref afbBindingV3
 *
 * This function replace any previously initialization callback set.
 *
 * This function is only valid during the pre-initialization stage.
 *
 * The callback initialization function will receive one argument: the api
 * to initialize.
 *
 * @param api the api that wants to process events
 * @param oninit the callback function that initialize the api
 *
 * @return 0 in case of success or -1 on failure with errno set
 *
 * @see afbBindingV3
 * @see afb_binding_v3
 */
int afb_api_on_init(
            afb_api_t api,
            int (*oninit)(afb_api_t api));

/**
 * Tells that the api provides a class of features. Classes are intended to
 * allow ordering of initializations: apis that provides a given class are
 * initialized before apis requiring it.
 *
 * This function is only valid during the pre-initialization stage.
 *
 * @param api  the api that provides the classes
 * @param name a space separated list of the names of the provided classes
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see afb_api_require_class
 */
int afb_api_provide_class(
            afb_api_t api,
            const char *name);

/**
 * Tells that the api requires a set of class features. Classes are intended to
 * allow ordering of initializations: apis that provides a given class are
 * initialized before apis requiring it.
 *
 * This function is only valid during the pre-initialization stage.
 *
 * @param api  the api that requires the classes
 * @param name a space separated list of the names of the required classes
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see afb_api_provide_class
 */
int afb_api_require_class(
            afb_api_t api,
            const char *name);

/**
 * Seal the api. After a call to this function the api can not be modified
 * anymore.
 *
 * @param api the api to be sealed
 */
void afb_api_seal(
            afb_api_t api);

/**
 * Delete the given api.
 *
 * It is of the responsibility of the caller to don't used the deleted api
 * anymore after this function returned.
 *
 * @param api the api to delete
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see afb_api_new_api
 */
int afb_api_delete_api(
            afb_api_t api);

/**
 * Create an aliased name 'as_name' for the api 'name'.
 * Calling this function is only allowed within preinit.
 *
 * @param api the api that requires the aliasing
 * @param name the api to alias
 * @param as_name the aliased name of the aliased api
 *
 * @return 0 in case of success or -1 in case of error with errno set appropriately.
 */
int afb_api_add_alias(
            afb_api_t api,
            const char *name,
            const char *as_name);

/**
 * @deprecated try to use @ref afb_api_call instead
 *
 * Calls the 'verb' of the 'apiname' with the arguments 'args' and 'verb'
 * in the name of the binding.
 * The result of the call is delivered to the 'callback' function
 * with the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 3 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'status' a status being 0 on success or negative when an error occurred,
 *  2. 'result' the resulting data as a JSON object.
 *
 * @param api      The api
 * @param apiname  The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 * @see also 'afb_api_call'
 * @see also 'afb_api_call_sync'
 * @see also 'afb_api_call_sync_legacy'
 * @see also 'afb_req_subcall'
 * @see also 'afb_req_subcall_sync'
 */
void afb_api_call_legacy(
            afb_api_t api,
            const char *apiname,
            const char *verb,
            struct json_object *args,
            void (*callback)(
                    void *closure,
                    int status,
                    struct json_object *result,
                    afb_api_t api),
            void *closure);

/**
 * @deprecated try to use @ref afb_api_call_sync instead
 *
 * Calls the 'verb' of the 'apiname' with the arguments 'args' and 'verb'
 * in the name of the binding.
 * 'result' will receive the response.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param api      The api
 * @param apiname  The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param result   Where to store the result - should call json_object_put on it -
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see also 'afb_api_call'
 * @see also 'afb_api_call_sync'
 * @see also 'afb_api_call_legacy'
 * @see also 'afb_req_subcall'
 * @see also 'afb_req_subcall_sync'
 */
int afb_api_call_sync_legacy(
            afb_api_t api,
            const char *apiname,
            const char *verb,
            struct json_object *args,
            struct json_object **result);

/**
 * Checks whether the request 'req' is valid or not.
 *
 * @param req the request to check
 *
 * @return 0 if not valid or 1 if valid.
 */
int afb_req_is_valid(
            afb_req_t req);

/**
 * Retrieves the api that serves the request
 *
 * @param req the request whose serving api is queried
 *
 * @return the api serving the request
 */
afb_api_t afb_req_get_api(
            afb_req_t req);

/**
 * Retrieves the callback data of the verb. This callback data is set
 * when the verb is created.
 *
 * @param req whose verb vcbdata is queried
 *
 * @return the callback data attached to the verb description
 */
void *afb_req_get_vcbdata(
            afb_req_t req);

/**
 * Retrieve the name of the called api.
 *
 * @param req the request
 *
 * @return the name of the called api
 *
 * @see afb_api_new_api
 * @see afb_api_add_alias
 */
const char *afb_req_get_called_api(
            afb_req_t req);

/**
 * Retrieve the name of the called verb
 *
 * @param req the request
 *
 * @return the name of the called verb
 */
const char *afb_req_get_called_verb(
            afb_req_t req);

/**
 * Increments the count of references of 'req'.
 *
 * @param req the request
 *
 * @return returns the request req
 */
afb_req_t *afb_req_addref(
            afb_req_t req);

/**
 * Decrement the count of references of 'req'.
 *
 * @param req the request
 */
void afb_req_unref(
            afb_req_t req);

/**
 * Is the log message of 'level (as defined for syslog) required for the
 * request 'req'?
 *
 * @param req the request
 * @param level the level to check as defined for syslog:
 *
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @return 0 if not required or a value not null if required
 *
 * @see syslog
 */
int afb_req_wants_log_level(
            afb_req_t req,
            int level);

/**
 * Send associated to 'req' a message described by 'fmt' and its 'args'
 * to the journal for the verbosity 'level'.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param req the request
 * @param level the level of the message
 * @param file the source filename that emits the message or NULL
 * @param line the line number in the source filename that emits the message
 * @param func the name of the function that emits the message or NULL
 * @param fmt the message format as for printf
 * @param args the arguments to the format
 *
 * @see printf
 * @see afb_req_verbose
 */
void afb_req_vverbose(
            afb_req_t req,
            int level, const char *file,
            int line,
            const char * func,
            const char *fmt,
            va_list args);

/**
 * Send associated to 'req' a message described by 'fmt' and following parameters
 * to the journal for the verbosity 'level'.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param req the request
 * @param level the level of the message
 * @param file the source filename that emits the message or NULL
 * @param line the line number in the source filename that emits the message
 * @param func the name of the function that emits the message or NULL
 * @param fmt the message format as for printf
 * @param ... the arguments of the format 'fmt'
 *
 * @see printf
 */
void afb_req_verbose(
            afb_req_t req,
            int level, const char *file,
            int line,
            const char * func,
            const char *fmt,
            ...);

/**
 * Gets from the request 'req' the argument of 'name'.
 *
 * Returns a PLAIN structure of type 'struct afb_arg'.
 *
 * When the argument of 'name' is not found, all fields of result are set to NULL.
 *
 * When the argument of 'name' is found, the fields are filled,
 * in particular, the field 'result.name' is set to 'name'.
 *
 * There is a special name value: the empty string.
 * The argument of name "" is defined only if the request was made using
 * an HTTP POST of Content-Type "application/json". In that case, the
 * argument of name "" receives the value of the body of the HTTP request.
 *
 * @param req the request
 * @param name the name of the argument to get
 *
 * @return a structure describing the retrieved argument for the request
 *
 * @see afb_req_value
 * @see afb_req_path
 */
struct afb_arg afb_req_get(
            afb_req_t req,
            const char *name);

/**
 * Gets from the request 'req' the string value of the argument of 'name'.
 * Returns NULL if when there is no argument of 'name'.
 * Returns the value of the argument of 'name' otherwise.
 *
 * Shortcut for: afb_req_get(req, name).value
 *
 * @param req the request
 * @param name the name of the argument's value to get
 *
 * @return the value as a string or NULL
 *
 * @see afb_req_get
 * @see afb_req_path
 */
const char *afb_req_value(
            afb_req_t req,
            const char *name);

/**
 * Gets from the request 'req' the path for file attached to the argument of 'name'.
 * Returns NULL if when there is no argument of 'name' or when there is no file.
 * Returns the path of the argument of 'name' otherwise.
 *
 * Shortcut for: afb_req_get(req, name).path
 *
 * @param req the request
 * @param name the name of the argument's path to get
 *
 * @return the path if any or NULL
 *
 * @see afb_req_get
 * @see afb_req_value
 */
const char *afb_req_path(
            afb_req_t req,
            const char *name);

/**
 * Gets from the request 'req' the json object hashing the arguments.
 *
 * The returned object must not be released using 'json_object_put'.
 *
 * @param req the request
 *
 * @return the JSON object of the query
 *
 * @see afb_req_get
 * @see afb_req_value
 * @see afb_req_path
 */
struct json_object *afb_req_json(
            afb_req_t req);

#define afb_req_success(r,o,i)      afb_req_reply(r,o,NULL,i)
#define afb_req_success_f(r,o,...)  afb_req_reply_f(r,o,NULL,__VA_ARGS__)
#define afb_req_success_v(r,o,f,v)  afb_req_reply_v(r,o,NULL,f,v)
#define afb_req_fail(r,e,i)     afb_req_reply(r,NULL,e,i)
#define afb_req_fail_f(r,e,...)     afb_req_reply_f(r,NULL,e,__VA_ARGS__)
#define afb_req_fail_v(r,e,f,v)     afb_req_reply_v(r,NULL,e,f,v)

/**
 * Sends a reply to the request 'req'.
 *
 * The status of the reply is set to 'error' (that must be NULL on success).
 * Its send the object 'obj' (can be NULL) with an
 * informational comment 'info (can also be NULL).
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text or NULL
 *
 * @see afb_req_reply_v
 * @see afb_req_reply_f
 */
void afb_req_reply(
            afb_req_t req,
            struct json_object *obj,
            const char *error,
            const char *info);

/**
 * Same as 'afb_req_reply_f' but the arguments to the format 'info'
 * are given as a variable argument list instance.
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text containing a format as for vprintf
 * @param args the va_list of arguments to the format as for vprintf
 *
 * @see afb_req_reply
 * @see afb_req_reply_f
 * @see vprintf
 */
void afb_req_reply_v(
            afb_req_t req,
            struct json_object *obj,
            const char *error,
            const char *info,
            va_list args);

/**
 * Same as 'afb_req_reply' but the 'info' is a formatting
 * string followed by arguments.
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text containing a format as for printf
 * @param ... the arguments to the format as for printf
 *
 * @see afb_req_reply
 * @see afb_req_reply_v
 * @see printf
 */
void afb_req_reply_f(
            afb_req_t req,
            struct json_object *obj,
            const char *error,
            const char *info,
            ...);

/**
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
 * The result of the call is delivered to the 'callback' function with the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 5 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'object'  a JSON object returned (can be NULL)
 *  3. 'error'   a string not NULL in case of error
 *  4. 'info'    a string handling some info (can be NULL)
 *  5. 'req'     the req
 *
 * NOTE: For convenience, *json_object_put* is called on 'object' after the
 * callback returns. So, it is wrong to call *json_object_put* in the callback.
 *
 * @param req      The request
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param flags    The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags_t
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 * The flags are any combination of the following values:
 *
 *    - afb_req_x2_subcall_catch_events = 1
 *
 *        the calling API wants to receive the events from subscription
 *
 *    - afb_req_x2_subcall_pass_events = 2
 *
 *        the original request will receive the events from subscription
 *
 *    - afb_req_x2_subcall_on_behalf = 4
 *
 *        the calling API wants to use the credentials of the original request
 *
 *    - afb_req_x2_subcall_api_session = 8
 *
 *        the calling API wants to use its session instead of the one of the
 *        original request
 *
 * @see also 'afb_req_subcall_sync'
 */
void afb_req_subcall(
            afb_req_t req,
            const char *api,
            const char *verb,
            struct json_object *args,
            int flags,
            void (*callback)(
                    void *closure,
                    struct json_object *object,
                    const char *error,
                    const char * info,
                    afb_req_t req),
            void *closure);

/**
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * This call is synchronous, it waits untill completion of the request.
 * It returns 0 on success or a negative value on error answer.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * See also:
 *  - 'afb_req_subcall_req' that is convenient to keep request alive automatically.
 *  - 'afb_req_subcall' that doesn't keep request alive automatically.
 *
 * @param req      The request
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param flags    The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags
 * @param object   a pointer where the replied JSON object is stored must be freed using @ref json_object_put (can be NULL)
 * @param error    a pointer where a copy of the replied error is stored must be freed using @ref free (can be NULL)
 * @param info     a pointer where a copy of the replied info is stored must be freed using @ref free (can be NULL)
 *
 * @return 0 in case of success or -1 in case of error
 */
int afb_req_subcall_sync(
            afb_req_t req,
            const char *api,
            const char *verb,
            struct json_object *args,
            int flags,
            struct json_object **object,
            char **error,
            char **info);

/**
 * Establishes for the client link identified by 'req' a subscription
 * to the 'event'.
 *
 * Establishing subscription MUST be called BEFORE replying to the request.
 *
 * @param req the request
 * @param event the event to subscribe
 *
 * @return 0 in case of successful subscription or -1 in case of error.
 */
int afb_req_subscribe(
            afb_req_t req,
            afb_event_t event);

/**
 * Revokes the subscription established to the 'event' for the client
 * link identified by 'req'.
 * Returns 0 in case of successful subscription or -1 in case of error.
 *
 * Revoking subscription MUST be called BEFORE replying to the request.
 *
 * @param req the request
 * @param event the event to revoke
 *
 * @return 0 in case of successful subscription or -1 in case of error.
 */
int afb_req_unsubscribe(
            afb_req_t req,
            afb_event_t event);

/**
 * Manage the pointer stored by the binding for the client session of 'req'.
 *
 * If no previous pointer is stored or if 'replace' is not zero, a new value
 * is generated using the function 'create_context' called with the 'closure'.
 * If 'create_context' is NULL the generated value is 'closure'.
 *
 * When a value is created, the function 'free_context' is recorded and will
 * be called (with the created value as argument) to free the created value when
 * it is not more used.
 *
 * This function is atomic: it ensures that 2 threads will not race together.
 *
 * @param req the request
 * @param replace if not zero an existing value is replaced
 * @param create_context the creation function or NULL
 * @param free_context the destroying function or NULL
 * @param closure the closure to the creation function
 *
 * @return the stored value
 */
void *afb_req_context(
            afb_req_t req,
            int replace,
            void *(*create_context)(void *closure),
            void (*free_context)(void*),
            void *closure);

/**
 * Gets the pointer stored by the binding for the session of 'req'.
 * When the binding has not yet recorded a pointer, NULL is returned.
 *
 * Shortcut for: afb_req_context(req, 0, NULL, NULL, NULL)
 *
 * @param req the request
 *
 * @return the previously stored value
 */
void *afb_req_context_get(
            afb_req_t req);

/**
 * Stores for the binding the pointer 'context' to the session of 'req'.
 * The function 'free_context' will be called when the session is closed
 * or if binding stores an other pointer.
 *
 * Shortcut for: afb_req_context(req, 1, NULL, free_context, context)
 *
 *
 * @param req the request
 * @param context the context value to store
 * @param free_context the cleaning function for the stored context (can be NULL)
 */
void afb_req_context_set(
            afb_req_t req,
            void *context,
            void (*free_context)(void*));

/**
 * Frees the pointer stored by the binding for the session of 'req'
 * and sets it to NULL.
 *
 * Shortcut for: afb_req_context_set(req, NULL, NULL)
 *
 * @param req the request
 */
void afb_req_context_clear(
            afb_req_t req);

/**
 * Closes the session associated with 'req'
 * and delete all associated contexts.
 *
 * @param req the request
 */
void afb_req_session_close(
            afb_req_t req);

/**
 * Sets the level of assurance of the session of 'req'
 * to 'level'. The effect of this function is subject of
 * security policies.
 *
 * @param req the request
 * @param level of assurance from 0 to 7
 *
 * @return 0 on success or -1 if failed.
 */
int afb_req_session_set_LOA(
            afb_req_t req,
            unsigned level);

/**
 * Check whether the 'permission' is granted or not to the client
 * identified by 'req'.
 *
 * @param req the request
 * @param permission string to check
 *
 * @return 1 if the permission is granted or 0 otherwise.
 */
int afb_req_has_permission(
            afb_req_t req,
            const char *permission);

/**
 * Get the application identifier of the client application for the
 * request 'req'.
 *
 * Returns the application identifier or NULL when the application
 * can not be identified.
 *
 * The returned value if not NULL must be freed by the caller
 *
 * @param req the request
 *
 * @return the string for the application id of the client MUST BE FREED
 */
char *afb_req_get_application_id(
            afb_req_t req);

/**
 * Get the user identifier (UID) of the client for the
 * request 'req'.
 *
 * @param req the request
 *
 * @return -1 when the application can not be identified or the unix uid.
 *
 */
int afb_req_get_uid(
            afb_req_t req);

/**
 * Get informations about the client of the
 * request 'req'.
 *
 * Returns an object with client informations:
 *  {
 *    "pid": int, "uid": int, "gid": int,
 *    "label": string, "id": string, "user": string,
 *    "uuid": string, "LOA": int
 *  }
 *
 * If some of this information can't be computed, the field of the return
 * object will not be set at all.
 *
 * @param req the request
 *
 * @return a JSON object that must be freed using @ref json_object_put
 */
struct json_object *afb_req_get_client_info(
            afb_req_t req);

/**
 * @deprecated use @ref afb_req_subcall
 *
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * On completion, the function 'callback' is invoked with the
 * 'closure' given at call and two other parameters: 'iserror' and 'result'.
 * 'status' is 0 on success or negative when on an error reply.
 * 'result' is the json object of the reply, you must not call json_object_put
 * on the result.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param api the name of the api to call
 * @param verb the name of the verb to call
 * @param args the arguments of the call as a JSON object
 * @param callback the call back that will receive the reply
 * @param closure the closure passed back to the callback
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 */
void afb_req_subcall_legacy(
            afb_req_t req,
            const char *api,
            const char *verb,
            struct json_object *args,
            void (*callback)(
                    void *closure,
                    int iserror,
                    struct json_object *result,
                    afb_req_t req),
            void *closure);

/**
 * @deprecated use @ref afb_req_subcall_sync
 *
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * This call is synchronous, it waits until completion of the request.
 * It returns 0 on success or a negative value on error answer.
 * The object pointed by 'result' is filled and must be released by the caller
 * after its use by calling 'json_object_put'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param api the name of the api to call
 * @param verb the name of the verb to call
 * @param args the arguments of the call as a JSON object
 * @param result the pointer to the JSON object pointer that will receive the result
 *
 * @return 0 on success or a negative value on error answer.
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 */
int afb_req_subcall_sync_legacy(
            afb_req_t req,
            const char *api,
            const char *verb,
            struct json_object *args,
            struct json_object **result);

/**
 * Checks whether the 'event' is valid or not.
 *
 * @param event the event to check
 *
 * @return 0 if not valid or 1 if valid.
 */
int afb_event_is_valid(
            afb_event_t event);

/**
 * Gets the name associated to 'event'.
 *
 * @param event the event whose name is requested
 *
 * @return the name of the event
 *
 * The returned name can be used until call to 'afb_event_unref'.
 * It shouldn't be freed.
 */
const char *afb_event_name(
            afb_event_t event);

/**
 * Decrease the count of references to 'event'.
 * Call this function when the evenid is no more used.
 * It destroys the event_x2 when the reference count falls to zero.
 *
 * @param event the event
 */
void afb_event_unref(
            afb_event_t event);

/**
 * Increases the count of references to 'event'
 *
 * @param event the event
 *
 * @return the event
 */
afb_event_t *afb_event_addref(
            afb_event_t event);

/**
 * Broadcasts widely an event of 'event' with the data 'object'.
 * 'object' can be NULL.
 *
 * For convenience, the function calls 'json_object_put' for 'object'.
 * Thus, in the case where 'object' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param event the event to broadcast
 * @param object the companion object to associate to the broadcasted event (can be NULL)
 *
 * @return 0 in case of success or -1 in case of error
 */
int afb_event_broadcast(
            afb_event_t event,
            struct json_object *object);

/**
 * Pushes an event of 'event' with the data 'object' to its observers.
 * 'object' can be NULL.
 *
 * For convenience, the function calls 'json_object_put' for 'object'.
 * Thus, in the case where 'object' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param event the event to push
 * @param object the companion object to associate to the pushed event (can be NULL)
 *
 * @Return
 *   *  1 if at least one client listen for the event
 *   *  0 if no more client listen for the event
 *   * -1 in case of error (the event can't be delivered)
 */
int afb_event_push(
            afb_event_t event,
            struct json_object *object);

/**
 * Retrieves the common systemd's event loop of AFB
 */
struct sd_event *afb_daemon_get_event_loop();

/**
 * Retrieves the common systemd's user/session d-bus of AFB
 */
struct sd_bus *afb_daemon_get_user_bus();

/**
 * Retrieves the common systemd's system d-bus of AFB
 */
struct sd_bus *afb_daemon_get_system_bus();

/**
 * Broadcasts widely the event of 'name' with the data 'object'.
 * 'object' can be NULL.
 *
 * For convenience, the function calls 'json_object_put' for 'object'.
 * Thus, in the case where 'object' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * Calling this function is only forbidden during preinit.
 *
 * Returns the count of clients that received the event.
 */
int afb_daemon_broadcast_event(
            const char *name,
            struct json_object *object);

/**
 * Creates an event of 'name' and returns it.
 *
 * Calling this function is only forbidden during preinit.
 *
 * See afb_event_is_valid to check if there is an error.
 */
afb_event_t afb_daemon_make_event(
            const char *name);

/**
 * @deprecated use bindings version 3
 *
 * Send a message described by 'fmt' and following parameters
 * to the journal for the verbosity 'level'.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 */
void afb_daemon_verbose(
            int level,
            const char *file,
            int line,
            const char * func,
            const char *fmt,
            ...);

/**
 * @deprecated use bindings version 3
 *
 * Get the root directory file descriptor. This file descriptor can
 * be used with functions 'openat', 'fstatat', ...
 *
 * Returns the file descriptor or -1 in case of error.
 */
int afb_daemon_rootdir_get_fd();

/**
 * Opens 'filename' within the root directory with 'flags' (see function openat)
 * using the 'locale' definition (example: "jp,en-US") that can be NULL.
 *
 * Returns the file descriptor or -1 in case of error.
 */
int afb_daemon_rootdir_open_locale(
            const char *filename,
            int flags,
            const char *locale);

/**
 * Queue the job defined by 'callback' and 'argument' for being executed asynchronously
 * in this thread (later) or in an other thread.
 * If 'group' is not NUL, the jobs queued with a same value (as the pointer value 'group')
 * are executed in sequence in the order of there submission.
 * If 'timeout' is not 0, it represent the maximum execution time for the job in seconds.
 * At first, the job is called with 0 as signum and the given argument.
 * The job is executed with the monitoring of its time and some signals like SIGSEGV and
 * SIGFPE. When a such signal is catched, the job is terminated and reexecuted but with
 * signum being the signal number (SIGALRM when timeout expired).
 *
 * Returns 0 in case of success or -1 in case of error.
 */
int afb_daemon_queue_job(
            void (*callback)(int signum, void *arg),
            void *argument,
            void *group,
            int timeout);

/**
 * Tells that it requires the API of "name" to exist
 * and if 'initialized' is not null to be initialized.
 * Calling this function is only allowed within init.
 *
 * Returns 0 in case of success or -1 in case of error.
 */
int afb_daemon_require_api(
            const char *name,
            int initialized);

/**
 * Create an aliased name 'as_name' for the api 'name'.
 * Calling this function is only allowed within preinit.
 *
 * Returns 0 in case of success or -1 in case of error.
 */
int afb_daemon_add_alias(const char *name, const char *as_name);

/**
 * Creates a new api of name 'api' with brief 'info'.
 *
 * Returns 0 in case of success or -1 in case of error.
 */
int afb_daemon_new_api(
            const char *api,
            const char *info,
            int noconcurrency,
            int (*preinit)(void*, struct afb_api_x3 *),
            void *closure);

/**
 * @deprecated try to use @ref afb_api_call instead
 *
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
 * The result of the call is delivered to the 'callback' function with the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 5 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'object'  a JSON object returned (can be NULL)
 *  3. 'error'   a string not NULL in case of error but NULL on success
 *  4. 'info'    a string handling some info (can be NULL)
 *  5. 'api'     the api
 *
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 * @see afb_api_call_sync
 */
void afb_service_call(
            const char *api,
            const char *verb,
            struct json_object *args,
            void (*callback)(
                    void *closure,
                    struct json_object *object,
                    const char *error,
                    const char * info,
                    afb_api_t api),
            void *closure);

/**
 * @deprecated try to use @ref afb_api_call_sync instead
 *
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
 * 'result' will receive the response.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param object   Where to store the returned object - should call json_object_put on it - can be NULL
 * @param error    Where to store the copied returned error - should call free on it - can be NULL
 * @param info     Where to store the copied returned info - should call free on it - can be NULL
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 * @see afb_api_call
 */
int afb_service_call_sync(
            const char *api,
            const char *verb,
            struct json_object *args,
            struct json_object **object,
            char **error,
            char **info);

/**
 * @deprecated try to use @ref afb_api_call instead
 *
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb'
 * in the name of the binding.
 * The result of the call is delivered to the 'callback' function with
 * the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 3 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'status' a status being 0 on success or negative when an error occurred,
 *  2. 'result' the resulting data as a JSON object.
 *
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 * @see also 'afb_api_call'
 * @see also 'afb_api_call_sync'
 * @see also 'afb_api_call_sync_legacy'
 * @see also 'afb_req_subcall'
 * @see also 'afb_req_subcall_sync'
 */
void afb_service_call_legacy(
            const char *api,
            const char *verb,
            struct json_object *args,
            void (*callback)(
                    void *closure,
                    int status,
                    struct json_object *result,
                    afb_api_t api),
            void *closure);

/**
 * @deprecated try to use @ref afb_api_call_sync instead
 *
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the
 * name of the binding. 'result' will receive the response.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param result   Where to store the result - should call json_object_put on it -
 *
 * @returns 0 in case of success or a negative value in case of error.
 *
 * @see also 'afb_api_call'
 * @see also 'afb_api_call_sync'
 * @see also 'afb_api_call_legacy'
 * @see also 'afb_req_subcall'
 * @see also 'afb_req_subcall_sync'
 */
int afb_service_call_sync_legacy(
            const char *api,
            const char *verb,
            struct json_object *args,
            struct json_object **result);