2 Unix SMB/CIFS implementation.
4 generalised event loop handling
6 Copyright (C) Andrew Tridgell 2005
7 Copyright (C) Stefan Metzmacher 2005-2009
8 Copyright (C) Volker Lendecke 2008
10 ** NOTE! The following LGPL license applies to the tevent
11 ** library. This does NOT imply that all of Samba is released
14 This library is free software; you can redistribute it and/or
15 modify it under the terms of the GNU Lesser General Public
16 License as published by the Free Software Foundation; either
17 version 3 of the License, or (at your option) any later version.
19 This library is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 Lesser General Public License for more details.
24 You should have received a copy of the GNU Lesser General Public
25 License along with this library; if not, see <http://www.gnu.org/licenses/>.
36 struct tevent_context;
40 struct tevent_immediate;
42 struct tevent_thread_proxy;
43 struct tevent_threaded_context;
46 * @defgroup tevent The tevent API
48 * The tevent low-level API
50 * This API provides the public interface to manage events in the tevent
51 * mainloop. Functions are provided for managing low-level events such
52 * as timer events, fd events and signal handling.
57 /* event handler types */
59 * Called when a file descriptor monitored by tevent has
60 * data to be read or written on it.
62 typedef void (*tevent_fd_handler_t)(struct tevent_context *ev,
63 struct tevent_fd *fde,
68 * Called when tevent is ceasing the monitoring of a file descriptor.
70 typedef void (*tevent_fd_close_fn_t)(struct tevent_context *ev,
71 struct tevent_fd *fde,
76 * Called when a tevent timer has fired.
78 typedef void (*tevent_timer_handler_t)(struct tevent_context *ev,
79 struct tevent_timer *te,
80 struct timeval current_time,
84 * Called when a tevent immediate event is invoked.
86 typedef void (*tevent_immediate_handler_t)(struct tevent_context *ctx,
87 struct tevent_immediate *im,
91 * Called after tevent detects the specified signal.
93 typedef void (*tevent_signal_handler_t)(struct tevent_context *ev,
94 struct tevent_signal *se,
101 * @brief Create a event_context structure.
103 * This must be the first events call, and all subsequent calls pass this
104 * event_context as the first element. Event handlers also receive this as
105 * their first argument.
107 * @param[in] mem_ctx The memory context to use.
109 * @return An allocated tevent context, NULL on error.
111 * @see tevent_context_init()
113 struct tevent_context *tevent_context_init(TALLOC_CTX *mem_ctx);
116 * @brief Create a event_context structure and select a specific backend.
118 * This must be the first events call, and all subsequent calls pass this
119 * event_context as the first element. Event handlers also receive this as
120 * their first argument.
122 * @param[in] mem_ctx The memory context to use.
124 * @param[in] name The name of the backend to use.
126 * @return An allocated tevent context, NULL on error.
128 struct tevent_context *tevent_context_init_byname(TALLOC_CTX *mem_ctx, const char *name);
131 * @brief Create a custom event context
133 * @param[in] mem_ctx The memory context to use.
134 * @param[in] ops The function pointer table of the backend.
135 * @param[in] additional_data The additional/private data to this instance
137 * @return An allocated tevent context, NULL on error.
140 struct tevent_context *tevent_context_init_ops(TALLOC_CTX *mem_ctx,
141 const struct tevent_ops *ops,
142 void *additional_data);
145 * @brief List available backends.
147 * @param[in] mem_ctx The memory context to use.
149 * @return A string vector with a terminating NULL element, NULL
152 const char **tevent_backend_list(TALLOC_CTX *mem_ctx);
155 * @brief Set the default tevent backend.
157 * @param[in] backend The name of the backend to set.
159 void tevent_set_default_backend(const char *backend);
163 * @brief Add a file descriptor based event.
165 * @param[in] ev The event context to work on.
167 * @param[in] mem_ctx The talloc memory context to use.
169 * @param[in] fd The file descriptor to base the event on.
171 * @param[in] flags #TEVENT_FD_READ or #TEVENT_FD_WRITE
173 * @param[in] handler The callback handler for the event.
175 * @param[in] private_data The private data passed to the callback handler.
177 * @return The file descriptor based event, NULL on error.
179 * @note To cancel the monitoring of a file descriptor, call talloc_free()
180 * on the object returned by this function.
182 * @note The caller should avoid closing the file descriptor before
183 * calling talloc_free()! Otherwise the behaviour is undefined which
184 * might result in crashes. See https://bugzilla.samba.org/show_bug.cgi?id=11141
187 struct tevent_fd *tevent_add_fd(struct tevent_context *ev,
191 tevent_fd_handler_t handler,
194 struct tevent_fd *_tevent_add_fd(struct tevent_context *ev,
198 tevent_fd_handler_t handler,
200 const char *handler_name,
201 const char *location);
202 #define tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
203 _tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data, \
204 #handler, __location__)
209 * @brief Add a timed event
211 * @param[in] ev The event context to work on.
213 * @param[in] mem_ctx The talloc memory context to use.
215 * @param[in] next_event Timeval specifying the absolute time to fire this
216 * event. This is not an offset.
218 * @param[in] handler The callback handler for the event.
220 * @param[in] private_data The private data passed to the callback handler.
222 * @return The newly-created timer event, or NULL on error.
224 * @note To cancel a timer event before it fires, call talloc_free() on the
225 * event returned from this function. This event is automatically
226 * talloc_free()-ed after its event handler files, if it hasn't been freed yet.
228 * @note Unlike some mainloops, tevent timers are one-time events. To set up
229 * a recurring event, it is necessary to call tevent_add_timer() again during
230 * the handler processing.
232 * @note Due to the internal mainloop processing, a timer set to run
233 * immediately will do so after any other pending timers fire, but before
234 * any further file descriptor or signal handling events fire. Callers should
235 * not rely on this behavior!
237 struct tevent_timer *tevent_add_timer(struct tevent_context *ev,
239 struct timeval next_event,
240 tevent_timer_handler_t handler,
243 struct tevent_timer *_tevent_add_timer(struct tevent_context *ev,
245 struct timeval next_event,
246 tevent_timer_handler_t handler,
248 const char *handler_name,
249 const char *location);
250 #define tevent_add_timer(ev, mem_ctx, next_event, handler, private_data) \
251 _tevent_add_timer(ev, mem_ctx, next_event, handler, private_data, \
252 #handler, __location__)
257 * Initialize an immediate event object
259 * This object can be used to trigger an event to occur immediately after
260 * returning from the current event (before any other event occurs)
262 * @param[in] mem_ctx The talloc memory context to use as the parent
264 * @return An empty tevent_immediate object. Use tevent_schedule_immediate
265 * to populate and use it.
267 * @note Available as of tevent 0.9.8
269 struct tevent_immediate *tevent_create_immediate(TALLOC_CTX *mem_ctx);
271 struct tevent_immediate *_tevent_create_immediate(TALLOC_CTX *mem_ctx,
272 const char *location);
273 #define tevent_create_immediate(mem_ctx) \
274 _tevent_create_immediate(mem_ctx, __location__)
280 * Schedule an event for immediate execution. This event will occur
281 * immediately after returning from the current event (before any other
284 * @param[in] im The tevent_immediate object to populate and use
285 * @param[in] ctx The tevent_context to run this event
286 * @param[in] handler The event handler to run when this event fires
287 * @param[in] private_data Data to pass to the event handler
289 void tevent_schedule_immediate(struct tevent_immediate *im,
290 struct tevent_context *ctx,
291 tevent_immediate_handler_t handler,
294 void _tevent_schedule_immediate(struct tevent_immediate *im,
295 struct tevent_context *ctx,
296 tevent_immediate_handler_t handler,
298 const char *handler_name,
299 const char *location);
300 #define tevent_schedule_immediate(im, ctx, handler, private_data) \
301 _tevent_schedule_immediate(im, ctx, handler, private_data, \
302 #handler, __location__);
307 * @brief Add a tevent signal handler
309 * tevent_add_signal() creates a new event for handling a signal the next
310 * time through the mainloop. It implements a very simple traditional signal
311 * handler whose only purpose is to add the handler event into the mainloop.
313 * @param[in] ev The event context to work on.
315 * @param[in] mem_ctx The talloc memory context to use.
317 * @param[in] signum The signal to trap
319 * @param[in] handler The callback handler for the signal.
321 * @param[in] sa_flags sigaction flags for this signal handler.
323 * @param[in] private_data The private data passed to the callback handler.
325 * @return The newly-created signal handler event, or NULL on error.
327 * @note To cancel a signal handler, call talloc_free() on the event returned
328 * from this function.
330 * @see tevent_num_signals, tevent_sa_info_queue_count
332 struct tevent_signal *tevent_add_signal(struct tevent_context *ev,
336 tevent_signal_handler_t handler,
339 struct tevent_signal *_tevent_add_signal(struct tevent_context *ev,
343 tevent_signal_handler_t handler,
345 const char *handler_name,
346 const char *location);
347 #define tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
348 _tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data, \
349 #handler, __location__)
353 * @brief the number of supported signals
355 * This returns value of the configure time TEVENT_NUM_SIGNALS constant.
357 * The 'signum' argument of tevent_add_signal() must be less than
358 * TEVENT_NUM_SIGNALS.
360 * @see tevent_add_signal
362 size_t tevent_num_signals(void);
365 * @brief the number of pending realtime signals
367 * This returns value of TEVENT_SA_INFO_QUEUE_COUNT.
369 * The tevent internals remember the last TEVENT_SA_INFO_QUEUE_COUNT
370 * siginfo_t structures for SA_SIGINFO signals. If the system generates
371 * more some signals get lost.
373 * @see tevent_add_signal
375 size_t tevent_sa_info_queue_count(void);
379 * @brief Pass a single time through the mainloop
381 * This will process any appropriate signal, immediate, fd and timer events
383 * @param[in] ev The event context to process
385 * @return Zero on success, nonzero if an internal error occurred
387 int tevent_loop_once(struct tevent_context *ev);
389 int _tevent_loop_once(struct tevent_context *ev, const char *location);
390 #define tevent_loop_once(ev) \
391 _tevent_loop_once(ev, __location__)
396 * @brief Run the mainloop
398 * The mainloop will run until there are no events remaining to be processed
400 * @param[in] ev The event context to process
402 * @return Zero if all events have been processed. Nonzero if an internal
405 int tevent_loop_wait(struct tevent_context *ev);
407 int _tevent_loop_wait(struct tevent_context *ev, const char *location);
408 #define tevent_loop_wait(ev) \
409 _tevent_loop_wait(ev, __location__)
414 * Assign a function to run when a tevent_fd is freed
416 * This function is a destructor for the tevent_fd. It does not automatically
417 * close the file descriptor. If this is the desired behavior, then it must be
418 * performed by the close_fn.
420 * @param[in] fde File descriptor event on which to set the destructor
421 * @param[in] close_fn Destructor to execute when fde is freed
423 void tevent_fd_set_close_fn(struct tevent_fd *fde,
424 tevent_fd_close_fn_t close_fn);
427 * Automatically close the file descriptor when the tevent_fd is freed
429 * This function calls close(fd) internally.
431 * @param[in] fde File descriptor event to auto-close
433 void tevent_fd_set_auto_close(struct tevent_fd *fde);
436 * Return the flags set on this file descriptor event
438 * @param[in] fde File descriptor event to query
440 * @return The flags set on the event. See #TEVENT_FD_READ and
443 uint16_t tevent_fd_get_flags(struct tevent_fd *fde);
446 * Set flags on a file descriptor event
448 * @param[in] fde File descriptor event to set
449 * @param[in] flags Flags to set on the event. See #TEVENT_FD_READ and
452 void tevent_fd_set_flags(struct tevent_fd *fde, uint16_t flags);
455 * Query whether tevent supports signal handling
457 * @param[in] ev An initialized tevent context
459 * @return True if this platform and tevent context support signal handling
461 bool tevent_signal_support(struct tevent_context *ev);
463 void tevent_set_abort_fn(void (*abort_fn)(const char *reason));
465 /* bits for file descriptor event flags */
468 * Monitor a file descriptor for write availability
470 #define TEVENT_FD_READ 1
472 * Monitor a file descriptor for data to be read
474 #define TEVENT_FD_WRITE 2
477 * Convenience function for declaring a tevent_fd writable
479 #define TEVENT_FD_WRITEABLE(fde) \
480 tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_WRITE)
483 * Convenience function for declaring a tevent_fd readable
485 #define TEVENT_FD_READABLE(fde) \
486 tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_READ)
489 * Convenience function for declaring a tevent_fd non-writable
491 #define TEVENT_FD_NOT_WRITEABLE(fde) \
492 tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_WRITE)
495 * Convenience function for declaring a tevent_fd non-readable
497 #define TEVENT_FD_NOT_READABLE(fde) \
498 tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_READ)
501 * Debug level of tevent
503 enum tevent_debug_level {
506 TEVENT_DEBUG_WARNING,
511 * @brief The tevent debug callbac.
513 * @param[in] context The memory context to use.
515 * @param[in] level The debug level.
517 * @param[in] fmt The format string.
519 * @param[in] ap The arguments for the format string.
521 typedef void (*tevent_debug_fn)(void *context,
522 enum tevent_debug_level level,
524 va_list ap) PRINTF_ATTRIBUTE(3,0);
527 * Set destination for tevent debug messages
529 * @param[in] ev Event context to debug
530 * @param[in] debug Function to handle output printing
531 * @param[in] context The context to pass to the debug function.
533 * @return Always returns 0 as of version 0.9.8
535 * @note Default is to emit no debug messages
537 int tevent_set_debug(struct tevent_context *ev,
538 tevent_debug_fn debug,
542 * Designate stderr for debug message output
544 * @param[in] ev Event context to debug
546 * @note This function will only output TEVENT_DEBUG_FATAL, TEVENT_DEBUG_ERROR
547 * and TEVENT_DEBUG_WARNING messages. For TEVENT_DEBUG_TRACE, please define a
548 * function for tevent_set_debug()
550 int tevent_set_debug_stderr(struct tevent_context *ev);
552 enum tevent_trace_point {
554 * Corresponds to a trace point just before waiting
556 TEVENT_TRACE_BEFORE_WAIT,
558 * Corresponds to a trace point just after waiting
560 TEVENT_TRACE_AFTER_WAIT,
561 #define TEVENT_HAS_LOOP_ONCE_TRACE_POINTS 1
563 * Corresponds to a trace point just before calling
564 * the loop_once() backend function.
566 TEVENT_TRACE_BEFORE_LOOP_ONCE,
568 * Corresponds to a trace point right after the
569 * loop_once() backend function has returned.
571 TEVENT_TRACE_AFTER_LOOP_ONCE,
574 typedef void (*tevent_trace_callback_t)(enum tevent_trace_point,
578 * Register a callback to be called at certain trace points
580 * @param[in] ev Event context
581 * @param[in] cb Trace callback
582 * @param[in] private_data Data to be passed to callback
584 * @note The callback will be called at trace points defined by
585 * tevent_trace_point. Call with NULL to reset.
587 void tevent_set_trace_callback(struct tevent_context *ev,
588 tevent_trace_callback_t cb,
592 * Retrieve the current trace callback
594 * @param[in] ev Event context
595 * @param[out] cb Registered trace callback
596 * @param[out] private_data Registered data to be passed to callback
598 * @note This can be used to allow one component that wants to
599 * register a callback to respect the callback that another component
600 * has already registered.
602 void tevent_get_trace_callback(struct tevent_context *ev,
603 tevent_trace_callback_t *cb,
611 * @defgroup tevent_request The tevent request functions.
614 * A tevent_req represents an asynchronous computation.
616 * The tevent_req group of API calls is the recommended way of
617 * programming async computations within tevent. In particular the
618 * file descriptor (tevent_add_fd) and timer (tevent_add_timed) events
619 * are considered too low-level to be used in larger computations. To
620 * read and write from and to sockets, Samba provides two calls on top
621 * of tevent_add_fd: tstream_read_packet_send/recv and tstream_writev_send/recv.
622 * These requests are much easier to compose than the low-level event
623 * handlers called from tevent_add_fd.
625 * A lot of the simplicity tevent_req has brought to the notoriously
626 * hairy async programming came via a set of conventions that every
627 * async computation programmed should follow. One central piece of
628 * these conventions is the naming of routines and variables.
630 * Every async computation needs a name (sensibly called "computation"
631 * down from here). From this name quite a few naming conventions are
634 * Every computation that requires local state needs a
636 * struct computation_state {
640 * Even if no local variables are required, such a state struct should
641 * be created containing a dummy variable. Quite a few helper
642 * functions and macros (for example tevent_req_create()) assume such
645 * An async computation is started by a computation_send
646 * function. When it is finished, its result can be received by a
647 * computation_recv function. For an example how to set up an async
648 * computation, see the code example in the documentation for
649 * tevent_req_create() and tevent_req_post(). The prototypes for _send
650 * and _recv functions should follow some conventions:
653 * struct tevent_req *computation_send(TALLOC_CTX *mem_ctx,
654 * struct tevent_req *ev,
656 * int computation_recv(struct tevent_req *req, ... further output args);
659 * The "int" result of computation_recv() depends on the result the
660 * sync version of the function would have, "int" is just an example
663 * Another important piece of the conventions is that the program flow
664 * is interrupted as little as possible. Because a blocking
665 * sub-computation requires that the flow needs to continue in a
666 * separate function that is the logical sequel of some computation,
667 * it should lexically follow sending off the blocking
668 * sub-computation. Setting the callback function via
669 * tevent_req_set_callback() requires referencing a function lexically
670 * below the call to tevent_req_set_callback(), forward declarations
671 * are required. A lot of the async computations thus begin with a
672 * sequence of declarations such as
675 * static void computation_step1_done(struct tevent_req *subreq);
676 * static void computation_step2_done(struct tevent_req *subreq);
677 * static void computation_step3_done(struct tevent_req *subreq);
680 * It really helps readability a lot to do these forward declarations,
681 * because the lexically sequential program flow makes the async
682 * computations almost as clear to read as a normal, sync program
685 * It is up to the user of the async computation to talloc_free it
686 * after it has finished. If an async computation should be aborted,
687 * the tevent_req structure can be talloc_free'ed. After it has
688 * finished, it should talloc_free'ed by the API user.
694 * An async request moves from TEVENT_REQ_INIT to
695 * TEVENT_REQ_IN_PROGRESS. All other states are valid after a request
698 enum tevent_req_state {
700 * We are creating the request
704 * We are waiting the request to complete
706 TEVENT_REQ_IN_PROGRESS,
708 * The request is finished successfully
712 * A user error has occurred. The user error has been
713 * indicated by tevent_req_error(), it can be retrieved via
714 * tevent_req_is_error().
716 TEVENT_REQ_USER_ERROR,
718 * Request timed out after the timeout set by tevent_req_set_endtime.
720 TEVENT_REQ_TIMED_OUT,
722 * An internal allocation has failed, or tevent_req_nomem has
723 * been given a NULL pointer as the first argument.
725 TEVENT_REQ_NO_MEMORY,
727 * The request has been received by the caller. No further
734 * @brief An async request
739 * @brief A tevent request callback function.
741 * @param[in] req The tevent async request which executed this callback.
743 typedef void (*tevent_req_fn)(struct tevent_req *req);
746 * @brief Set an async request callback.
748 * See the documentation of tevent_req_post() for an example how this
749 * is supposed to be used.
751 * @param[in] req The async request to set the callback.
753 * @param[in] fn The callback function to set.
755 * @param[in] pvt A pointer to private data to pass to the async request
758 void tevent_req_set_callback(struct tevent_req *req, tevent_req_fn fn, void *pvt);
762 * @brief Get the private data cast to the given type for a callback from
763 * a tevent request structure.
766 * static void computation_done(struct tevent_req *subreq) {
767 * struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req);
768 * struct computation_state *state = tevent_req_data(req, struct computation_state);
769 * .... more things, eventually maybe call tevent_req_done(req);
773 * @param[in] req The structure to get the callback data from.
775 * @param[in] type The type of the private callback data to get.
777 * @return The type casted private data set NULL if not set.
779 void *tevent_req_callback_data(struct tevent_req *req, #type);
781 void *_tevent_req_callback_data(struct tevent_req *req);
782 #define tevent_req_callback_data(_req, _type) \
783 talloc_get_type_abort(_tevent_req_callback_data(_req), _type)
788 * @brief Get the private data for a callback from a tevent request structure.
790 * @param[in] req The structure to get the callback data from.
792 * @param[in] req The structure to get the data from.
794 * @return The private data or NULL if not set.
796 void *tevent_req_callback_data_void(struct tevent_req *req);
798 #define tevent_req_callback_data_void(_req) \
799 _tevent_req_callback_data(_req)
804 * @brief Get the private data from a tevent request structure.
806 * When the tevent_req has been created by tevent_req_create, the
807 * result of tevent_req_data() is the state variable created by
808 * tevent_req_create() as a child of the req.
810 * @param[in] req The structure to get the private data from.
812 * @param[in] type The type of the private data
814 * @return The private data or NULL if not set.
816 void *tevent_req_data(struct tevent_req *req, #type);
818 void *_tevent_req_data(struct tevent_req *req);
819 #define tevent_req_data(_req, _type) \
820 talloc_get_type_abort(_tevent_req_data(_req), _type)
824 * @brief The print function which can be set for a tevent async request.
826 * @param[in] req The tevent async request.
828 * @param[in] ctx A talloc memory context which can be uses to allocate
831 * @return An allocated string buffer to print.
835 * static char *my_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
837 * struct my_data *data = tevent_req_data(req, struct my_data);
840 * result = tevent_req_default_print(mem_ctx, req);
841 * if (result == NULL) {
845 * return talloc_asprintf_append_buffer(result, "foo=%d, bar=%d",
846 * data->foo, data->bar);
850 typedef char *(*tevent_req_print_fn)(struct tevent_req *req, TALLOC_CTX *ctx);
853 * @brief This function sets a print function for the given request.
855 * This function can be used to setup a print function for the given request.
856 * This will be triggered if the tevent_req_print() function was
857 * called on the given request.
859 * @param[in] req The request to use.
861 * @param[in] fn A pointer to the print function
863 * @note This function should only be used for debugging.
865 void tevent_req_set_print_fn(struct tevent_req *req, tevent_req_print_fn fn);
868 * @brief The default print function for creating debug messages.
870 * The function should not be used by users of the async API,
871 * but custom print function can use it and append custom text
874 * @param[in] req The request to be printed.
876 * @param[in] mem_ctx The memory context for the result.
878 * @return Text representation of request.
881 char *tevent_req_default_print(struct tevent_req *req, TALLOC_CTX *mem_ctx);
884 * @brief Print an tevent_req structure in debug messages.
886 * This function should be used by callers of the async API.
888 * @param[in] mem_ctx The memory context for the result.
890 * @param[in] req The request to be printed.
892 * @return Text representation of request.
894 char *tevent_req_print(TALLOC_CTX *mem_ctx, struct tevent_req *req);
897 * @brief A typedef for a cancel function for a tevent request.
899 * @param[in] req The tevent request calling this function.
901 * @return True if the request could be canceled, false if not.
903 typedef bool (*tevent_req_cancel_fn)(struct tevent_req *req);
906 * @brief This function sets a cancel function for the given tevent request.
908 * This function can be used to setup a cancel function for the given request.
909 * This will be triggered if the tevent_req_cancel() function was
910 * called on the given request.
912 * @param[in] req The request to use.
914 * @param[in] fn A pointer to the cancel function.
916 void tevent_req_set_cancel_fn(struct tevent_req *req, tevent_req_cancel_fn fn);
920 * @brief Try to cancel the given tevent request.
922 * This function can be used to cancel the given request.
924 * It is only possible to cancel a request when the implementation
925 * has registered a cancel function via the tevent_req_set_cancel_fn().
927 * @param[in] req The request to use.
929 * @return This function returns true is the request is cancelable,
930 * othererwise false is returned.
932 * @note Even if the function returns true, the caller need to wait
933 * for the function to complete normally.
934 * Only the _recv() function of the given request indicates
935 * if the request was really canceled.
937 bool tevent_req_cancel(struct tevent_req *req);
939 bool _tevent_req_cancel(struct tevent_req *req, const char *location);
940 #define tevent_req_cancel(req) \
941 _tevent_req_cancel(req, __location__)
945 * @brief A typedef for a cleanup function for a tevent request.
947 * @param[in] req The tevent request calling this function.
949 * @param[in] req_state The current tevent_req_state.
952 typedef void (*tevent_req_cleanup_fn)(struct tevent_req *req,
953 enum tevent_req_state req_state);
956 * @brief This function sets a cleanup function for the given tevent request.
958 * This function can be used to setup a cleanup function for the given request.
959 * This will be triggered when the tevent_req_done() or tevent_req_error()
960 * function was called, before notifying the callers callback function,
961 * and also before scheduling the deferred trigger.
963 * This might be useful if more than one tevent_req belong together
964 * and need to finish both requests at the same time.
966 * The cleanup function is able to call tevent_req_done() or tevent_req_error()
967 * recursively, the cleanup function is only triggered the first time.
969 * The cleanup function is also called by tevent_req_received()
970 * (possibly triggered from tevent_req_destructor()) before destroying
971 * the private data of the tevent_req.
973 * @param[in] req The request to use.
975 * @param[in] fn A pointer to the cancel function.
977 void tevent_req_set_cleanup_fn(struct tevent_req *req, tevent_req_cleanup_fn fn);
981 * @brief Create an async tevent request.
983 * The new async request will be initialized in state TEVENT_REQ_IN_PROGRESS.
986 * struct tevent_req *req;
987 * struct computation_state *state;
988 * req = tevent_req_create(mem_ctx, &state, struct computation_state);
991 * Tevent_req_create() allocates and zeros the state variable as a talloc
992 * child of its result. The state variable should be used as the talloc
993 * parent for all temporary variables that are allocated during the async
994 * computation. This way, when the user of the async computation frees
995 * the request, the state as a talloc child will be free'd along with
996 * all the temporary variables hanging off the state.
998 * @param[in] mem_ctx The memory context for the result.
999 * @param[in] pstate Pointer to the private request state.
1000 * @param[in] type The name of the request.
1002 * @return A new async request. NULL on error.
1004 struct tevent_req *tevent_req_create(TALLOC_CTX *mem_ctx,
1005 void **pstate, #type);
1007 struct tevent_req *_tevent_req_create(TALLOC_CTX *mem_ctx,
1011 const char *location);
1013 #define tevent_req_create(_mem_ctx, _pstate, _type) \
1014 _tevent_req_create((_mem_ctx), (_pstate), sizeof(_type), \
1015 #_type, __location__)
1019 * @brief Set a timeout for an async request.
1021 * @param[in] req The request to set the timeout for.
1023 * @param[in] ev The event context to use for the timer.
1025 * @param[in] endtime The endtime of the request.
1027 * @return True if succeeded, false if not.
1029 bool tevent_req_set_endtime(struct tevent_req *req,
1030 struct tevent_context *ev,
1031 struct timeval endtime);
1035 * @brief Call the notify callback of the given tevent request manually.
1037 * @param[in] req The tevent request to call the notify function from.
1039 * @see tevent_req_set_callback()
1041 void tevent_req_notify_callback(struct tevent_req *req);
1043 void _tevent_req_notify_callback(struct tevent_req *req, const char *location);
1044 #define tevent_req_notify_callback(req) \
1045 _tevent_req_notify_callback(req, __location__)
1050 * @brief An async request has successfully finished.
1052 * This function is to be used by implementors of async requests. When a
1053 * request is successfully finished, this function calls the user's completion
1056 * @param[in] req The finished request.
1058 void tevent_req_done(struct tevent_req *req);
1060 void _tevent_req_done(struct tevent_req *req,
1061 const char *location);
1062 #define tevent_req_done(req) \
1063 _tevent_req_done(req, __location__)
1068 * @brief An async request has seen an error.
1070 * This function is to be used by implementors of async requests. When a
1071 * request can not successfully completed, the implementation should call this
1072 * function with the appropriate status code.
1074 * If error is 0 the function returns false and does nothing more.
1076 * @param[in] req The request with an error.
1078 * @param[in] error The error code.
1080 * @return On success true is returned, false if error is 0.
1083 * int error = first_function();
1084 * if (tevent_req_error(req, error)) {
1088 * error = second_function();
1089 * if (tevent_req_error(req, error)) {
1093 * tevent_req_done(req);
1097 bool tevent_req_error(struct tevent_req *req,
1100 bool _tevent_req_error(struct tevent_req *req,
1102 const char *location);
1103 #define tevent_req_error(req, error) \
1104 _tevent_req_error(req, error, __location__)
1109 * @brief Helper function for nomem check.
1111 * Convenience helper to easily check alloc failure within a callback
1112 * implementing the next step of an async request.
1114 * @param[in] p The pointer to be checked.
1116 * @param[in] req The request being processed.
1119 * p = talloc(mem_ctx, bla);
1120 * if (tevent_req_nomem(p, req)) {
1125 bool tevent_req_nomem(const void *p,
1126 struct tevent_req *req);
1128 bool _tevent_req_nomem(const void *p,
1129 struct tevent_req *req,
1130 const char *location);
1131 #define tevent_req_nomem(p, req) \
1132 _tevent_req_nomem(p, req, __location__)
1137 * @brief Indicate out of memory to a request
1139 * @param[in] req The request being processed.
1141 void tevent_req_oom(struct tevent_req *req);
1143 void _tevent_req_oom(struct tevent_req *req,
1144 const char *location);
1145 #define tevent_req_oom(req) \
1146 _tevent_req_oom(req, __location__)
1150 * @brief Finish a request before the caller had the change to set the callback.
1152 * An implementation of an async request might find that it can either finish
1153 * the request without waiting for an external event, or it can not even start
1154 * the engine. To present the illusion of a callback to the user of the API,
1155 * the implementation can call this helper function which triggers an
1156 * immediate event. This way the caller can use the same calling
1157 * conventions, independent of whether the request was actually deferred.
1160 * struct tevent_req *computation_send(TALLOC_CTX *mem_ctx,
1161 * struct tevent_context *ev)
1163 * struct tevent_req *req, *subreq;
1164 * struct computation_state *state;
1165 * req = tevent_req_create(mem_ctx, &state, struct computation_state);
1166 * if (req == NULL) {
1169 * subreq = subcomputation_send(state, ev);
1170 * if (tevent_req_nomem(subreq, req)) {
1171 * return tevent_req_post(req, ev);
1173 * tevent_req_set_callback(subreq, computation_done, req);
1178 * @param[in] req The finished request.
1180 * @param[in] ev The tevent_context for the immediate event.
1182 * @return The given request will be returned.
1184 struct tevent_req *tevent_req_post(struct tevent_req *req,
1185 struct tevent_context *ev);
1188 * @brief Finish multiple requests within one function
1190 * Normally tevent_req_notify_callback() and all wrappers
1191 * (e.g. tevent_req_done() and tevent_req_error())
1192 * need to be the last thing an event handler should call.
1193 * This is because the callback is likely to destroy the
1194 * context of the current function.
1196 * If a function wants to notify more than one caller,
1197 * it is dangerous if it just triggers multiple callbacks
1198 * in a row. With tevent_req_defer_callback() it is possible
1199 * to set an event context that will be used to defer the callback
1200 * via an immediate event (similar to tevent_req_post()).
1203 * struct complete_state {
1204 * struct tevent_context *ev;
1206 * struct tevent_req **reqs;
1209 * void complete(struct complete_state *state)
1211 * size_t i, c = talloc_array_length(state->reqs);
1213 * for (i=0; i < c; i++) {
1214 * tevent_req_defer_callback(state->reqs[i], state->ev);
1215 * tevent_req_done(state->reqs[i]);
1220 * @param[in] req The finished request.
1222 * @param[in] ev The tevent_context for the immediate event.
1224 * @return The given request will be returned.
1226 void tevent_req_defer_callback(struct tevent_req *req,
1227 struct tevent_context *ev);
1230 * @brief Check if the given request is still in progress.
1232 * It is typically used by sync wrapper functions.
1234 * @param[in] req The request to poll.
1236 * @return The boolean form of "is in progress".
1238 bool tevent_req_is_in_progress(struct tevent_req *req);
1241 * @brief Actively poll for the given request to finish.
1243 * This function is typically used by sync wrapper functions.
1245 * @param[in] req The request to poll.
1247 * @param[in] ev The tevent_context to be used.
1249 * @return On success true is returned. If a critical error has
1250 * happened in the tevent loop layer false is returned.
1251 * This is not the return value of the given request!
1253 * @note This should only be used if the given tevent context was created by the
1254 * caller, to avoid event loop nesting.
1257 * req = tstream_writev_queue_send(mem_ctx,
1262 * ok = tevent_req_poll(req, tctx->ev);
1263 * rc = tstream_writev_queue_recv(req, &sys_errno);
1267 bool tevent_req_poll(struct tevent_req *req,
1268 struct tevent_context *ev);
1271 * @brief Get the tevent request state and the actual error set by
1275 * int computation_recv(struct tevent_req *req, uint64_t *perr)
1277 * enum tevent_req_state state;
1279 * if (tevent_req_is_error(req, &state, &err)) {
1287 * @param[in] req The tevent request to get the error from.
1289 * @param[out] state A pointer to store the tevent request error state.
1291 * @param[out] error A pointer to store the error set by tevent_req_error().
1293 * @return True if the function could set error and state, false
1296 * @see tevent_req_error()
1298 bool tevent_req_is_error(struct tevent_req *req,
1299 enum tevent_req_state *state,
1303 * @brief Use as the last action of a _recv() function.
1305 * This function destroys the attached private data.
1307 * @param[in] req The finished request.
1309 void tevent_req_received(struct tevent_req *req);
1312 * @brief Create a tevent subrequest at a given time.
1314 * The idea is that always the same syntax for tevent requests.
1316 * @param[in] mem_ctx The talloc memory context to use.
1318 * @param[in] ev The event handle to setup the request.
1320 * @param[in] wakeup_time The time to wakeup and execute the request.
1322 * @return The new subrequest, NULL on error.
1326 * static void my_callback_wakeup_done(tevent_req *subreq)
1328 * struct tevent_req *req = tevent_req_callback_data(subreq,
1329 * struct tevent_req);
1332 * ok = tevent_wakeup_recv(subreq);
1333 * TALLOC_FREE(subreq);
1335 * tevent_req_error(req, -1);
1343 * subreq = tevent_wakeup_send(mem_ctx, ev, wakeup_time);
1344 * if (tevent_req_nomem(subreq, req)) {
1347 * tevent_set_callback(subreq, my_callback_wakeup_done, req);
1350 * @see tevent_wakeup_recv()
1352 struct tevent_req *tevent_wakeup_send(TALLOC_CTX *mem_ctx,
1353 struct tevent_context *ev,
1354 struct timeval wakeup_time);
1357 * @brief Check if the wakeup has been correctly executed.
1359 * This function needs to be called in the callback function set after calling
1360 * tevent_wakeup_send().
1362 * @param[in] req The tevent request to check.
1364 * @return True on success, false otherwise.
1366 * @see tevent_wakeup_recv()
1368 bool tevent_wakeup_recv(struct tevent_req *req);
1373 * @defgroup tevent_helpers The tevent helper functions
1382 * @brief Compare two timeval values.
1384 * @param[in] tv1 The first timeval value to compare.
1386 * @param[in] tv2 The second timeval value to compare.
1388 * @return 0 if they are equal.
1389 * 1 if the first time is greater than the second.
1390 * -1 if the first time is smaller than the second.
1392 int tevent_timeval_compare(const struct timeval *tv1,
1393 const struct timeval *tv2);
1396 * @brief Get a zero timeval value.
1398 * @return A zero timeval value.
1400 struct timeval tevent_timeval_zero(void);
1403 * @brief Get a timeval value for the current time.
1405 * @return A timeval value with the current time.
1407 struct timeval tevent_timeval_current(void);
1410 * @brief Get a timeval structure with the given values.
1412 * @param[in] secs The seconds to set.
1414 * @param[in] usecs The microseconds to set.
1416 * @return A timeval structure with the given values.
1418 struct timeval tevent_timeval_set(uint32_t secs, uint32_t usecs);
1421 * @brief Get the difference between two timeval values.
1423 * @param[in] tv1 The first timeval.
1425 * @param[in] tv2 The second timeval.
1427 * @return A timeval structure with the difference between the
1428 * first and the second value.
1430 struct timeval tevent_timeval_until(const struct timeval *tv1,
1431 const struct timeval *tv2);
1434 * @brief Check if a given timeval structure is zero.
1436 * @param[in] tv The timeval to check if it is zero.
1438 * @return True if it is zero, false otherwise.
1440 bool tevent_timeval_is_zero(const struct timeval *tv);
1443 * @brief Add the given amount of time to a timeval structure.
1445 * @param[in] tv The timeval structure to add the time.
1447 * @param[in] secs The seconds to add to the timeval.
1449 * @param[in] usecs The microseconds to add to the timeval.
1451 * @return The timeval structure with the new time.
1453 struct timeval tevent_timeval_add(const struct timeval *tv, uint32_t secs,
1457 * @brief Get a timeval in the future with a specified offset from now.
1459 * @param[in] secs The seconds of the offset from now.
1461 * @param[in] usecs The microseconds of the offset from now.
1463 * @return A timval with the given offset in the future.
1465 struct timeval tevent_timeval_current_ofs(uint32_t secs, uint32_t usecs);
1471 * @defgroup tevent_queue The tevent queue functions
1474 * A tevent_queue is used to queue up async requests that must be
1475 * serialized. For example writing buffers into a socket must be
1476 * serialized. Writing a large lump of data into a socket can require
1477 * multiple write(2) or send(2) system calls. If more than one async
1478 * request is outstanding to write large buffers into a socket, every
1479 * request must individually be completed before the next one begins,
1480 * even if multiple syscalls are required.
1482 * Take a look at @ref tevent_queue_tutorial for more details.
1486 struct tevent_queue;
1487 struct tevent_queue_entry;
1491 * @brief Create and start a tevent queue.
1493 * @param[in] mem_ctx The talloc memory context to allocate the queue.
1495 * @param[in] name The name to use to identify the queue.
1497 * @return An allocated tevent queue on success, NULL on error.
1499 * @see tevent_queue_start()
1500 * @see tevent_queue_stop()
1502 struct tevent_queue *tevent_queue_create(TALLOC_CTX *mem_ctx,
1505 struct tevent_queue *_tevent_queue_create(TALLOC_CTX *mem_ctx,
1507 const char *location);
1509 #define tevent_queue_create(_mem_ctx, _name) \
1510 _tevent_queue_create((_mem_ctx), (_name), __location__)
1514 * @brief A callback trigger function run by the queue.
1516 * @param[in] req The tevent request the trigger function is executed on.
1518 * @param[in] private_data The private data pointer specified by
1519 * tevent_queue_add().
1521 * @see tevent_queue_add()
1522 * @see tevent_queue_add_entry()
1523 * @see tevent_queue_add_optimize_empty()
1525 typedef void (*tevent_queue_trigger_fn_t)(struct tevent_req *req,
1526 void *private_data);
1529 * @brief Add a tevent request to the queue.
1531 * @param[in] queue The queue to add the request.
1533 * @param[in] ev The event handle to use for the request.
1535 * @param[in] req The tevent request to add to the queue.
1537 * @param[in] trigger The function triggered by the queue when the request
1538 * is called. Since tevent 0.9.14 it's possible to
1539 * pass NULL, in order to just add a "blocker" to the
1542 * @param[in] private_data The private data passed to the trigger function.
1544 * @return True if the request has been successfully added, false
1547 bool tevent_queue_add(struct tevent_queue *queue,
1548 struct tevent_context *ev,
1549 struct tevent_req *req,
1550 tevent_queue_trigger_fn_t trigger,
1551 void *private_data);
1554 * @brief Add a tevent request to the queue.
1556 * The request can be removed from the queue by calling talloc_free()
1557 * (or a similar function) on the returned queue entry. This
1558 * is the only difference to tevent_queue_add().
1560 * @param[in] queue The queue to add the request.
1562 * @param[in] ev The event handle to use for the request.
1564 * @param[in] req The tevent request to add to the queue.
1566 * @param[in] trigger The function triggered by the queue when the request
1567 * is called. Since tevent 0.9.14 it's possible to
1568 * pass NULL, in order to just add a "blocker" to the
1571 * @param[in] private_data The private data passed to the trigger function.
1573 * @return a pointer to the tevent_queue_entry if the request
1574 * has been successfully added, NULL otherwise.
1576 * @see tevent_queue_add()
1577 * @see tevent_queue_add_optimize_empty()
1579 struct tevent_queue_entry *tevent_queue_add_entry(
1580 struct tevent_queue *queue,
1581 struct tevent_context *ev,
1582 struct tevent_req *req,
1583 tevent_queue_trigger_fn_t trigger,
1584 void *private_data);
1587 * @brief Add a tevent request to the queue using a possible optimization.
1589 * This tries to optimize for the empty queue case and may calls
1590 * the trigger function directly. This is the only difference compared
1591 * to tevent_queue_add_entry().
1593 * The caller needs to be prepared that the trigger function has
1594 * already called tevent_req_notify_callback(), tevent_req_error(),
1595 * tevent_req_done() or a similar function.
1597 * The request can be removed from the queue by calling talloc_free()
1598 * (or a similar function) on the returned queue entry.
1600 * @param[in] queue The queue to add the request.
1602 * @param[in] ev The event handle to use for the request.
1604 * @param[in] req The tevent request to add to the queue.
1606 * @param[in] trigger The function triggered by the queue when the request
1607 * is called. Since tevent 0.9.14 it's possible to
1608 * pass NULL, in order to just add a "blocker" to the
1611 * @param[in] private_data The private data passed to the trigger function.
1613 * @return a pointer to the tevent_queue_entry if the request
1614 * has been successfully added, NULL otherwise.
1616 * @see tevent_queue_add()
1617 * @see tevent_queue_add_entry()
1619 struct tevent_queue_entry *tevent_queue_add_optimize_empty(
1620 struct tevent_queue *queue,
1621 struct tevent_context *ev,
1622 struct tevent_req *req,
1623 tevent_queue_trigger_fn_t trigger,
1624 void *private_data);
1627 * @brief Start a tevent queue.
1629 * The queue is started by default.
1631 * @param[in] queue The queue to start.
1633 void tevent_queue_start(struct tevent_queue *queue);
1636 * @brief Stop a tevent queue.
1638 * The queue is started by default.
1640 * @param[in] queue The queue to stop.
1642 void tevent_queue_stop(struct tevent_queue *queue);
1645 * @brief Get the length of the queue.
1647 * @param[in] queue The queue to get the length from.
1649 * @return The number of elements.
1651 size_t tevent_queue_length(struct tevent_queue *queue);
1654 * @brief Is the tevent queue running.
1656 * The queue is started by default.
1658 * @param[in] queue The queue.
1660 * @return Wether the queue is running or not..
1662 bool tevent_queue_running(struct tevent_queue *queue);
1665 * @brief Create a tevent subrequest that waits in a tevent_queue
1667 * The idea is that always the same syntax for tevent requests.
1669 * @param[in] mem_ctx The talloc memory context to use.
1671 * @param[in] ev The event handle to setup the request.
1673 * @param[in] queue The queue to wait in.
1675 * @return The new subrequest, NULL on error.
1677 * @see tevent_queue_wait_recv()
1679 struct tevent_req *tevent_queue_wait_send(TALLOC_CTX *mem_ctx,
1680 struct tevent_context *ev,
1681 struct tevent_queue *queue);
1684 * @brief Check if we no longer need to wait in the queue.
1686 * This function needs to be called in the callback function set after calling
1687 * tevent_queue_wait_send().
1689 * @param[in] req The tevent request to check.
1691 * @return True on success, false otherwise.
1693 * @see tevent_queue_wait_send()
1695 bool tevent_queue_wait_recv(struct tevent_req *req);
1697 typedef int (*tevent_nesting_hook)(struct tevent_context *ev,
1702 const char *location);
1705 * @brief Create a tevent_thread_proxy for message passing between threads.
1707 * The tevent_context must have been allocated on the NULL
1708 * talloc context, and talloc_disable_null_tracking() must
1711 * @param[in] dest_ev_ctx The tevent_context to receive events.
1713 * @return An allocated tevent_thread_proxy, NULL on error.
1714 * If tevent was compiled without PTHREAD support
1715 * NULL is always returned and errno set to ENOSYS.
1717 * @see tevent_thread_proxy_schedule()
1719 struct tevent_thread_proxy *tevent_thread_proxy_create(
1720 struct tevent_context *dest_ev_ctx);
1723 * @brief Schedule an immediate event on an event context from another thread.
1725 * Causes dest_ev_ctx, being run by another thread, to receive an
1726 * immediate event calling the handler with the *pp_private parameter.
1728 * *pp_im must be a pointer to an immediate event talloced on a context owned
1729 * by the calling thread, or the NULL context. Ownership will
1730 * be transferred to the tevent_thread_proxy and *pp_im will be returned as NULL.
1732 * *pp_private_data must be a talloced area of memory with no destructors.
1733 * Ownership of this memory will be transferred to the tevent library and
1734 * *pp_private_data will be set to NULL on successful completion of
1735 * the call. Set pp_private to NULL if no parameter transfer
1736 * needed (a pure callback). This is an asynchronous request, caller
1737 * does not wait for callback to be completed before returning.
1739 * @param[in] tp The tevent_thread_proxy to use.
1741 * @param[in] pp_im Pointer to immediate event pointer.
1743 * @param[in] handler The function that will be called.
1745 * @param[in] pp_private_data The talloced memory to transfer.
1747 * @see tevent_thread_proxy_create()
1749 void tevent_thread_proxy_schedule(struct tevent_thread_proxy *tp,
1750 struct tevent_immediate **pp_im,
1751 tevent_immediate_handler_t handler,
1752 void *pp_private_data);
1755 * @brief Create a context for threaded activation of immediates
1757 * A tevent_treaded_context provides a link into an event
1758 * context. Using tevent_threaded_schedule_immediate, it is possible
1759 * to activate an immediate event from within a thread.
1761 * It is the duty of the caller of tevent_threaded_context_create() to
1762 * keep the event context around longer than any
1763 * tevent_threaded_context. tevent will abort if ev is talllc_free'ed
1764 * with an active tevent_threaded_context.
1766 * If tevent is build without pthread support, this always returns
1767 * NULL with errno=ENOSYS.
1769 * @param[in] mem_ctx The talloc memory context to use.
1770 * @param[in] ev The event context to link this to.
1771 * @return The threaded context, or NULL with errno set.
1773 * @see tevent_threaded_schedule_immediate()
1775 * @note Available as of tevent 0.9.30
1777 struct tevent_threaded_context *tevent_threaded_context_create(
1778 TALLOC_CTX *mem_ctx, struct tevent_context *ev);
1782 * @brief Activate an immediate from a thread
1784 * Activate an immediate from within a thread.
1786 * This routine does not watch out for talloc hierarchies. This means
1787 * that it is highly recommended to create the tevent_immediate in the
1788 * thread owning tctx, allocate a threaded job description for the
1789 * thread, hand over both pointers to a helper thread and not touch it
1790 * in the main thread at all anymore.
1792 * tevent_threaded_schedule_immediate is intended as a job completion
1793 * indicator for simple threaded helpers.
1795 * Please be aware that tevent_threaded_schedule_immediate is very
1796 * picky about its arguments: An immediate may not already be
1797 * activated and the handler must exist. With
1798 * tevent_threaded_schedule_immediate memory ownership is transferred
1799 * to the main thread holding the tevent context behind tctx, the
1800 * helper thread can't access it anymore.
1802 * @param[in] tctx The threaded context to go through
1803 * @param[in] im The immediate event to activate
1804 * @param[in] handler The immediate handler to call in the main thread
1805 * @param[in] private_data Pointer for the immediate handler
1807 * @see tevent_threaded_context_create()
1809 * @note Available as of tevent 0.9.30
1811 void tevent_threaded_schedule_immediate(struct tevent_threaded_context *tctx,
1812 struct tevent_immediate *im,
1813 tevent_immediate_handler_t handler,
1814 void *private_data);
1816 void _tevent_threaded_schedule_immediate(struct tevent_threaded_context *tctx,
1817 struct tevent_immediate *im,
1818 tevent_immediate_handler_t handler,
1820 const char *handler_name,
1821 const char *location);
1822 #define tevent_threaded_schedule_immediate(tctx, im, handler, private_data) \
1823 _tevent_threaded_schedule_immediate(tctx, im, handler, private_data, \
1824 #handler, __location__);
1827 #ifdef TEVENT_DEPRECATED
1828 #ifndef _DEPRECATED_
1829 #ifdef HAVE___ATTRIBUTE__
1830 #define _DEPRECATED_ __attribute__ ((deprecated))
1832 #define _DEPRECATED_
1835 void tevent_loop_allow_nesting(struct tevent_context *ev) _DEPRECATED_;
1836 void tevent_loop_set_nesting_hook(struct tevent_context *ev,
1837 tevent_nesting_hook hook,
1838 void *private_data) _DEPRECATED_;
1839 int _tevent_loop_until(struct tevent_context *ev,
1840 bool (*finished)(void *private_data),
1842 const char *location) _DEPRECATED_;
1843 #define tevent_loop_until(ev, finished, private_data) \
1844 _tevent_loop_until(ev, finished, private_data, __location__)
1847 int tevent_re_initialise(struct tevent_context *ev);
1852 * @defgroup tevent_ops The tevent operation functions
1855 * The following structure and registration functions are exclusively
1856 * needed for people writing and pluggin a different event engine.
1857 * There is nothing useful for normal tevent user in here.
1863 int (*context_init)(struct tevent_context *ev);
1865 /* fd_event functions */
1866 struct tevent_fd *(*add_fd)(struct tevent_context *ev,
1867 TALLOC_CTX *mem_ctx,
1868 int fd, uint16_t flags,
1869 tevent_fd_handler_t handler,
1871 const char *handler_name,
1872 const char *location);
1873 void (*set_fd_close_fn)(struct tevent_fd *fde,
1874 tevent_fd_close_fn_t close_fn);
1875 uint16_t (*get_fd_flags)(struct tevent_fd *fde);
1876 void (*set_fd_flags)(struct tevent_fd *fde, uint16_t flags);
1878 /* timed_event functions */
1879 struct tevent_timer *(*add_timer)(struct tevent_context *ev,
1880 TALLOC_CTX *mem_ctx,
1881 struct timeval next_event,
1882 tevent_timer_handler_t handler,
1884 const char *handler_name,
1885 const char *location);
1887 /* immediate event functions */
1888 void (*schedule_immediate)(struct tevent_immediate *im,
1889 struct tevent_context *ev,
1890 tevent_immediate_handler_t handler,
1892 const char *handler_name,
1893 const char *location);
1895 /* signal functions */
1896 struct tevent_signal *(*add_signal)(struct tevent_context *ev,
1897 TALLOC_CTX *mem_ctx,
1898 int signum, int sa_flags,
1899 tevent_signal_handler_t handler,
1901 const char *handler_name,
1902 const char *location);
1904 /* loop functions */
1905 int (*loop_once)(struct tevent_context *ev, const char *location);
1906 int (*loop_wait)(struct tevent_context *ev, const char *location);
1909 bool tevent_register_backend(const char *name, const struct tevent_ops *ops);
1914 * @defgroup tevent_compat The tevent compatibility functions
1917 * The following definitions are usueful only for compatibility with the
1918 * implementation originally developed within the samba4 code and will be
1919 * soon removed. Please NEVER use in new code.
1926 #ifdef TEVENT_COMPAT_DEFINES
1928 #define event_context tevent_context
1929 #define event_ops tevent_ops
1930 #define fd_event tevent_fd
1931 #define timed_event tevent_timer
1932 #define signal_event tevent_signal
1934 #define event_fd_handler_t tevent_fd_handler_t
1935 #define event_timed_handler_t tevent_timer_handler_t
1936 #define event_signal_handler_t tevent_signal_handler_t
1938 #define event_context_init(mem_ctx) \
1939 tevent_context_init(mem_ctx)
1941 #define event_context_init_byname(mem_ctx, name) \
1942 tevent_context_init_byname(mem_ctx, name)
1944 #define event_backend_list(mem_ctx) \
1945 tevent_backend_list(mem_ctx)
1947 #define event_set_default_backend(backend) \
1948 tevent_set_default_backend(backend)
1950 #define event_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
1951 tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data)
1953 #define event_add_timed(ev, mem_ctx, next_event, handler, private_data) \
1954 tevent_add_timer(ev, mem_ctx, next_event, handler, private_data)
1956 #define event_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
1957 tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data)
1959 #define event_loop_once(ev) \
1960 tevent_loop_once(ev)
1962 #define event_loop_wait(ev) \
1963 tevent_loop_wait(ev)
1965 #define event_get_fd_flags(fde) \
1966 tevent_fd_get_flags(fde)
1968 #define event_set_fd_flags(fde, flags) \
1969 tevent_fd_set_flags(fde, flags)
1971 #define EVENT_FD_READ TEVENT_FD_READ
1972 #define EVENT_FD_WRITE TEVENT_FD_WRITE
1974 #define EVENT_FD_WRITEABLE(fde) \
1975 TEVENT_FD_WRITEABLE(fde)
1977 #define EVENT_FD_READABLE(fde) \
1978 TEVENT_FD_READABLE(fde)
1980 #define EVENT_FD_NOT_WRITEABLE(fde) \
1981 TEVENT_FD_NOT_WRITEABLE(fde)
1983 #define EVENT_FD_NOT_READABLE(fde) \
1984 TEVENT_FD_NOT_READABLE(fde)
1986 #define ev_debug_level tevent_debug_level
1988 #define EV_DEBUG_FATAL TEVENT_DEBUG_FATAL
1989 #define EV_DEBUG_ERROR TEVENT_DEBUG_ERROR
1990 #define EV_DEBUG_WARNING TEVENT_DEBUG_WARNING
1991 #define EV_DEBUG_TRACE TEVENT_DEBUG_TRACE
1993 #define ev_set_debug(ev, debug, context) \
1994 tevent_set_debug(ev, debug, context)
1996 #define ev_set_debug_stderr(_ev) tevent_set_debug_stderr(ev)
1998 #endif /* TEVENT_COMPAT_DEFINES */
2002 #endif /* __TEVENT_H__ */