Improve documentation of api v3

The documentation is improved to reflect the new version.

Tune the options

Change-Id: I894c3db3bc0c10e89db66a9a51a9ad049bb8c0c4
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

7 files changed, 2381 insertions, 0 deletions

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+Functions of class **afb_api**
+============================
+
+## General functions
+
+### afb_api_name
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_get_userdata
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_set_userdata
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_require_api
+
+```C
+/**
+ * Check that it requires the API of 'name'.
+ * If 'initialized' is not zero it request 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);
+```
+
+
+## Verbosity functions
+
+### afb_api_wants_log_level
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_vverbose
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_verbose
+
+```C
+/**
+ * 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,
+			...);
+```
+
+## Data retrieval functions
+
+### afb_api_rootdir_get_fd
+
+```C
+/**
+ * Get the root directory file descriptor. This file descriptor can
+ * be used with functions 'openat', 'fstatat', ...
+ *
+ * CAUTION, manipulate this 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);
+```
+
+### afb_api_rootdir_open_locale
+
+```C
+/**
+ * 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);
+```
+
+## Calls and job functions
+
+### afb_api_call
+
+```C
+/**
+ * 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 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);
+```
+
+### afb_api_call_sync
+
+```C
+/**
+ * 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 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);
+```
+
+### afb_api_queue_job
+
+```C
+/**
+ * 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);
+```
+
+## Event functions
+
+### afb_api_broadcast_event
+
+```C
+/**
+ * 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 the count of clients that received the event.
+ */
+int afb_api_broadcast_event(
+			afb_api_t api,
+			const char *name,
+			struct json_object *object);
+```
+
+### afb_api_make_event
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_event_handler_add
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_event_handler_del
+
+```C
+/**
+ * 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);
+
+```
+
+## Systemd functions
+
+### afb_api_get_event_loop
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_get_user_bus
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_get_system_bus
+
+```C
+/**
+ * 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);
+```
+
+
+## Dynamic api functions
+
+### afb_api_new_api
+
+```C
+/**
+ * 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 \ref preinit
+ *
+ * @return 0 in case of success or -1 on failure with errno set
+ *
+ * @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);
+```
+
+### afb_api_set_verbs_v2
+
+```C
+/**
+ * @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);
+```
+
+### afb_api_set_verbs_v3
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_add_verb
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_del_verb
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_on_event
+
+```C
+/**
+ * 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));
+```
+
+### afb_api_on_init
+
+```C
+/**
+ * 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));
+```
+
+### afb_api_provide_class
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_require_class
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_seal
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_delete_api
+
+```C
+/**
+ * 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);
+```
+
+### afb_api_add_alias
+
+```C
+/**
+ * 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);
+```
+
+
+## Legacy functions
+
+The function for legacy calls are still provided for some time because
+adaptation of existing code to the new call functions require a small amount
+of work.
+
+### afb_api_call_legacy
+
+```C
+/**
+ * @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
+ * @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);
+```
+
+### afb_api_call_sync_legacy
+
+```C
+/**
+ * @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
+ * @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);
+```
+
diff --git a/docs/reference-v3/func-daemon.md b/docs/reference-v3/func-daemon.md
new file mode 100644
index 00000000..11f44fbf
--- /dev/null
+++ b/docs/reference-v3/func-daemon.md
@@ -0,0 +1,146 @@
+Functions of class **afb_daemon**
+============================
+
+All the functions of the class **afb_daemon** use the default api.
+This are internally aliased to the corresponding function of class afb_api_t.
+
+```C
+/**
+ * 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);
+```
diff --git a/docs/reference-v3/func-event.md b/docs/reference-v3/func-event.md
new file mode 100644
index 00000000..90c172d8
--- /dev/null
+++ b/docs/reference-v3/func-event.md
@@ -0,0 +1,108 @@
+Functions of class afb_event_t
+==============================
+
+## General functions
+
+### afb_event_is_valid
+
+```C
+/**
+ * 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);
+```
+
+### afb_event_name
+
+```C
+/**
+ * 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);
+```
+
+### afb_event_unref
+
+```C
+/**
+ * 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);
+```
+
+### afb_event_addref
+
+```C
+/**
+ * Increases the count of references to 'event'
+ *
+ * @param event the event
+ *
+ * @return the event
+ */
+afb_event_t *afb_event_addref(
+			afb_event_t event);
+```
+
+## Pushing functions
+
+### afb_event_broadcast
+
+```C
+/**
+ * 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 the count of clients that received the event.
+ */
+int afb_event_broadcast(
+			afb_event_t event,
+			struct json_object *object);
+```
+
+### afb_event_push
+
+```C
+/**
+ * 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 the count of clients that received the event.
+ */
+int afb_event_push(
+			afb_event_t event,
+			struct json_object *object);
+```
+
diff --git a/docs/reference-v3/func-req.md b/docs/reference-v3/func-req.md
new file mode 100644
index 00000000..bdec581f
--- /dev/null
+++ b/docs/reference-v3/func-req.md
@@ -0,0 +1,835 @@
+Functions of class afb_req_t
+============================
+
+## General function
+
+### afb_req_is_valid
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_api
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_vcbdata
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_called_api
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_called_verb
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_addref
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_unref
+
+```C
+/**
+ * Decrement the count of references of 'req'.
+ *
+ * @param req the request
+ */
+void afb_req_unref(
+			afb_req_t*req);
+```
+
+
+## Logging functions
+
+### afb_req_wants_log_level
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_vverbose
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_verbose
+
+```C
+/**
+ * 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,
+			...);
+```
+
+## Arguments/parameters function
+
+### afb_req_get
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_value
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_path
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_json
+
+```C
+/**
+ * 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);
+```
+
+## Reply functions
+
+The functions **success** and **fail** are still supported.
+These functions are now implemented as the following macros:
+
+```C
+#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)
+```
+
+
+### afb_req_reply
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_reply_v
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_reply_f
+
+```C
+/**
+ * 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,
+			...);
+```
+
+## Subcall functions
+
+
+
+### afb_req_subcall
+
+```C
+/**
+ * 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
+ *
+ * @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);
+```
+
+### afb_req_subcall_sync
+
+```C
+/**
+ * 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);
+```
+
+## Event functions
+
+### afb_req_subscribe
+
+```C
+/**
+ * Establishes for the client link identified by 'req' a subscription
+ * to the 'event'.
+ *
+ * @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);
+```
+
+### afb_req_unsubscribe
+
+```C
+/**
+ * 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.
+ *
+ * @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);
+```
+
+## Session functions
+
+### afb_req_context
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_context_get
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_context_set
+
+```C
+/**
+ * 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*));
+```
+
+### afb_req_context_clear
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_session_close
+
+```C
+/**
+ * Closes the session associated with 'req'
+ * and delete all associated contexts.
+ *
+ * @param req the request
+ */
+void afb_req_session_close(
+			afb_req_t*req);
+```
+
+### afb_req_session_set_LOA
+
+```C
+/**
+ * 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);
+```
+
+## Credential/client functions
+
+### afb_req_has_permission
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_application_id
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_uid
+
+```C
+/**
+ * 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);
+```
+
+### afb_req_get_client_info
+
+```C
+/**
+ * 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);
+```
+
+## Legacy functions
+
+### afb_req_subcall_legacy
+
+```C
+/**
+ * @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);
+```
+
+### afb_req_subcall_sync_legacy
+
+```C
+/**
+ * @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 untill 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);
+```
+
diff --git a/docs/reference-v3/func-service.md b/docs/reference-v3/func-service.md
new file mode 100644
index 00000000..b18c486c
--- /dev/null
+++ b/docs/reference-v3/func-service.md
@@ -0,0 +1,59 @@
+Functions of class afb_service
+==============================
+
+All the functions of the class **afb_daemon** use the default api.
+This are internally aliased to the corresponding legacy function of
+class **afb_api**.
+
+```C
+/**
+ * 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 'callback_closure',
+ *  2. 'status' a status being 0 on success or negative when an error occured,
+ *  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 callback_closure The closure to pass to the callback
+ *
+ * @see also 'afb_req_subcall'
+ */
+void afb_service_call(
+	const char *api,
+	const char *verb,
+	struct json_object *args,
+	void (*callback)(void*closure, int status, struct json_object *result),
+	void *callback_closure);
+
+/**
+ * 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_req_subcall'
+ */
+int afb_service_call_sync(
+	const char *api,
+	const char *verb,
+	struct json_object *args,
+	struct json_object **result);
+```
\ No newline at end of file
diff --git a/docs/reference-v3/macro-log.md b/docs/reference-v3/macro-log.md
new file mode 100644
index 00000000..90d0be45
--- /dev/null
+++ b/docs/reference-v3/macro-log.md
@@ -0,0 +1,53 @@
+Macro for logging
+=================
+
+The final behaviour of macros can be tuned using 2 defines that must be defined
+before including **<afb/afb-binding.h>**.
+
+| define                                | action
+|---------------------------------------|--------------------
+| AFB_BINDING_PRAGMA_NO_VERBOSE_DATA    | show file and line, remove function and text message
+| AFB_BINDING_PRAGMA_NO_VERBOSE_DETAILS | show text, remove function, line and file
+
+## Logging for an api
+
+The following macros must be used for logging for an **api** of type
+**afb_api_t**.
+
+```C
+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,...)
+```
+
+## Logging for a request
+
+
+The following macros can be used for logging in the context
+of a request **req** of type **afb_req_t**:
+
+```C
+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,...)
+```
+
+By default, the logging macros add file, line and function
+indication.
+
+## Logging legacy
+
+The following macros are provided for legacy.
+
+```C
+AFB_ERROR(fmt,...)
+AFB_WARNING(fmt,...)
+AFB_NOTICE(fmt,...)
+AFB_INFO(fmt,...)
+AFB_DEBUG(fmt,...)
+```
+
diff --git a/docs/reference-v3/types-and-globals.md b/docs/reference-v3/types-and-globals.md
new file mode 100644
index 00000000..dc50b97a
--- /dev/null
+++ b/docs/reference-v3/types-and-globals.md
@@ -0,0 +1,243 @@
+# Types and globals
+
+## The global afbBindingRoot
+
+The global **afbBindingRoot** of type **afb_api_t** is always implicitely
+defined for bindings of version 3 or upper. It records the root api of
+the binding.
+
+When the binding has a defined **afbBindingExport**,  the root api 
+**afbBindingRoot** is the **afb_pi_t** relative to the api created for
+this static description.
+
+When the binding has no defined **afbBindingExport**, the root api is
+a virtual api representing the shared object of the binding. In that case
+the name of the api is the path of the shared object. Its use is restricted
+but allows log messages.
+
+## The global afbBindingExport
+
+The global **afbBindingExport** is not mandatory.
+
+If **afbBindingExport** is defined and exported, it must be of the type 
+**const afb_binding_t** and must describe the *root* api of the binding.
+
+## The type afb_api_t
+
+Bindings now can declare more than one api. The counter part is that
+a new handle is needed to manage apis. These handles are of the type
+**afb_api_t**.
+
+It is defined as below.
+
+```C
+typedef struct afb_api_x3 afb_api_t;
+```
+
+## The type afb_binding_t
+
+The main structure, of type **afb_binding_t**, for describing the binding
+must be exported under the name **afbBindingExport**.
+
+This structure is defined as below.
+
+```C
+typedef struct afb_binding_v3 afb_binding_t;
+```
+
+Where:
+
+```C
+/**
+ * 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;
+};
+```
+
+## The type afb_verb_t
+
+Each verb is described with a structure of type **afb_verb_t**
+defined below:
+
+```C
+typedef struct afb_verb_v3 afb_verb_t;
+```
+
+```C
+/**
+ * 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;
+};
+```
+
+The **session** flags is one of the constant defined below:
+
+| Name                   | Description
+|:----------------------:|------------------------------------------------------
+| AFB_SESSION_NONE       | no flag, synonym to 0
+| AFB_SESSION_LOA_0      | Requires the LOA to be 0 or more, synonym to 0 or AFB_SESSION_NONE
+| AFB_SESSION_LOA_1      | Requires the LOA to be 1 or more
+| AFB_SESSION_LOA_2      | Requires the LOA to be 2 or more
+| AFB_SESSION_LOA_3      | Requires the LOA to be 3 or more
+| AFB_SESSION_CHECK      | Requires the token to be set and valid
+| AFB_SESSION_REFRESH    | Implies a token refresh
+| AFB_SESSION_CLOSE      | Implies closing the session after request processed
+
+The LOA (Level Of Assurance) is set, by binding api, using the function **afb_req_session_set_LOA**.
+
+The session can be closed, by binding api, using the function **afb_req_session_close**.
+
+## The types afb_auth_t and afb_auth_type_t
+
+The structure **afb_auth_t** is used within verb description to
+set security requirements.  
+The interpretation of the structure depends on the value of the field **type**.
+
+```C
+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;
+};
+
+```
+
+The possible values for **type** is defined here:
+
+```C
+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 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
+};
+```
+
+Example:
+
+```C
+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] }
+};
+```
+
+
+## The type afb_req_subcall_flags_t
+
+This is an enumeration that defines bit's positions for setting behaviour
+of subcalls.
+
+| flag                       | value | description
+|----------------------------|-------|--------------
+| afb_req_subcall_catch_events | 1 | the calling API wants to receive the events from subscription
+| afb_req_subcall_pass_events  | 2 | the original request will receive the events from subscription
+| afb_req_subcall_on_behalf    | 4 | the calling API wants to use the credentials of the original request
+| afb_req_subcall_api_session  | 8 | the calling API wants to use its session instead of the one of the original request
+