lib/tevent/tevent.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    generalised event loop handling
   5
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher 2005-2009
   8    Copyright (C) Volker Lendecke 2008
   9
  10      ** NOTE! The following LGPL license applies to the tevent
  11      ** library. This does NOT imply that all of Samba is released
  12      ** under the LGPL
  13
  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.
  18
  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.
  23
  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/>.
  26 */
  27
  28 #ifndef __TEVENT_H__
  29 #define __TEVENT_H__
  30
  31 #include <stdint.h>
  32 #include <talloc.h>
  33 #include <sys/time.h>
  34 #include <stdbool.h>
  35
  36 struct tevent_context;
  37 struct tevent_ops;
  38 struct tevent_fd;
  39 struct tevent_timer;
  40 struct tevent_signal;
  41
  42 /* event handler types */
  43 typedef void (*tevent_fd_handler_t)(struct tevent_context *ev,
  44                                     struct tevent_fd *fde,
  45                                     uint16_t flags,
  46                                     void *private_data);
  47 typedef void (*tevent_fd_close_fn_t)(struct tevent_context *ev,
  48                                      struct tevent_fd *fde,
  49                                      int fd,
  50                                      void *private_data);
  51 typedef void (*tevent_timer_handler_t)(struct tevent_context *ev,
  52                                        struct tevent_timer *te,
  53                                        struct timeval current_time,
  54                                        void *private_data);
  55 typedef void (*tevent_signal_handler_t)(struct tevent_context *ev,
  56                                         struct tevent_signal *se,
  57                                         int signum,
  58                                         int count,
  59                                         void *siginfo,
  60                                         void *private_data);
  61
  62 struct tevent_context *tevent_context_init(TALLOC_CTX *mem_ctx);
  63 struct tevent_context *tevent_context_init_byname(TALLOC_CTX *mem_ctx, const char *name);
  64 const char **tevent_backend_list(TALLOC_CTX *mem_ctx);
  65 void tevent_set_default_backend(const char *backend);
  66
  67 struct tevent_fd *_tevent_add_fd(struct tevent_context *ev,
  68                                  TALLOC_CTX *mem_ctx,
  69                                  int fd,
  70                                  uint16_t flags,
  71                                  tevent_fd_handler_t handler,
  72                                  void *private_data,
  73                                  const char *handler_name,
  74                                  const char *location);
  75 #define tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
  76         _tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data, \
  77                        #handler, __location__)
  78
  79 struct tevent_timer *_tevent_add_timer(struct tevent_context *ev,
  80                                        TALLOC_CTX *mem_ctx,
  81                                        struct timeval next_event,
  82                                        tevent_timer_handler_t handler,
  83                                        void *private_data,
  84                                        const char *handler_name,
  85                                        const char *location);
  86 #define tevent_add_timer(ev, mem_ctx, next_event, handler, private_data) \
  87         _tevent_add_timer(ev, mem_ctx, next_event, handler, private_data, \
  88                           #handler, __location__)
  89
  90 struct tevent_signal *_tevent_add_signal(struct tevent_context *ev,
  91                                          TALLOC_CTX *mem_ctx,
  92                                          int signum,
  93                                          int sa_flags,
  94                                          tevent_signal_handler_t handler,
  95                                          void *private_data,
  96                                          const char *handler_name,
  97                                          const char *location);
  98 #define tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
  99         _tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data, \
 100                            #handler, __location__)
 101
 102 int _tevent_loop_once(struct tevent_context *ev, const char *location);
 103 #define tevent_loop_once(ev) \
 104         _tevent_loop_once(ev, __location__) \
 105
 106 int _tevent_loop_wait(struct tevent_context *ev, const char *location);
 107 #define tevent_loop_wait(ev) \
 108         _tevent_loop_wait(ev, __location__) \
 109
 110 void tevent_fd_set_close_fn(struct tevent_fd *fde,
 111                             tevent_fd_close_fn_t close_fn);
 112 void tevent_fd_set_auto_close(struct tevent_fd *fde);
 113 uint16_t tevent_fd_get_flags(struct tevent_fd *fde);
 114 void tevent_fd_set_flags(struct tevent_fd *fde, uint16_t flags);
 115
 116 bool tevent_signal_support(struct tevent_context *ev);
 117
 118 void tevent_set_abort_fn(void (*abort_fn)(const char *reason));
 119
 120 /* bits for file descriptor event flags */
 121 #define TEVENT_FD_READ 1
 122 #define TEVENT_FD_WRITE 2
 123
 124 #define TEVENT_FD_WRITEABLE(fde) \
 125         tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_WRITE)
 126 #define TEVENT_FD_READABLE(fde) \
 127         tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) | TEVENT_FD_READ)
 128
 129 #define TEVENT_FD_NOT_WRITEABLE(fde) \
 130         tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_WRITE)
 131 #define TEVENT_FD_NOT_READABLE(fde) \
 132         tevent_fd_set_flags(fde, tevent_fd_get_flags(fde) & ~TEVENT_FD_READ)
 133
 134 /* DEBUG */
 135 enum tevent_debug_level {
 136         TEVENT_DEBUG_FATAL,
 137         TEVENT_DEBUG_ERROR,
 138         TEVENT_DEBUG_WARNING,
 139         TEVENT_DEBUG_TRACE
 140 };
 141
 142 int tevent_set_debug(struct tevent_context *ev,
 143                      void (*debug)(void *context,
 144                                    enum tevent_debug_level level,
 145                                    const char *fmt,
 146                                    va_list ap) PRINTF_ATTRIBUTE(3,0),
 147                      void *context);
 148 int tevent_set_debug_stderr(struct tevent_context *ev);
 149
 150 /**
 151  * An async request moves between the following 4 states:
 152  */
 153 enum tevent_req_state {
 154         /**
 155          * we are creating the request
 156          */
 157         TEVENT_REQ_INIT,
 158         /**
 159          * we are waiting the request to complete
 160          */
 161         TEVENT_REQ_IN_PROGRESS,
 162         /**
 163          * the request is finished
 164          */
 165         TEVENT_REQ_DONE,
 166         /**
 167          * A user error has occured
 168          */
 169         TEVENT_REQ_USER_ERROR,
 170         /**
 171          * Request timed out
 172          */
 173         TEVENT_REQ_TIMED_OUT,
 174         /**
 175          * No memory in between
 176          */
 177         TEVENT_REQ_NO_MEMORY,
 178         /**
 179          * the request is already received by the caller
 180          */
 181         TEVENT_REQ_RECEIVED
 182 };
 183
 184 /**
 185  * @brief An async request
 186  *
 187  * This represents an async request being processed by callbacks via an event
 188  * context. A user can issue for example a write request to a socket, giving
 189  * an implementation function the fd, the buffer and the number of bytes to
 190  * transfer. The function issuing the request will immediately return without
 191  * blocking most likely without having sent anything. The API user then fills
 192  * in req->async.fn and req->async.private_data, functions that are called
 193  * when the request is finished.
 194  *
 195  * It is up to the user of the async request to talloc_free it after it has
 196  * finished. This can happen while the completion function is called.
 197  */
 198
 199 struct tevent_req;
 200
 201 typedef void (*tevent_req_fn)(struct tevent_req *);
 202
 203 void tevent_req_set_callback(struct tevent_req *req, tevent_req_fn fn, void *pvt);
 204 void *_tevent_req_callback_data(struct tevent_req *req);
 205 void *_tevent_req_data(struct tevent_req *req);
 206
 207 #define tevent_req_callback_data(_req, _type) \
 208         talloc_get_type_abort(_tevent_req_callback_data(_req), _type)
 209 #define tevent_req_callback_data_void(_req) \
 210         _tevent_req_callback_data(_req)
 211 #define tevent_req_data(_req, _type) \
 212         talloc_get_type_abort(_tevent_req_data(_req), _type)
 213
 214 typedef char *(*tevent_req_print_fn)(struct tevent_req *, TALLOC_CTX *);
 215
 216 void tevent_req_set_print_fn(struct tevent_req *req, tevent_req_print_fn fn);
 217
 218 char *tevent_req_default_print(struct tevent_req *req, TALLOC_CTX *mem_ctx);
 219
 220 char *tevent_req_print(TALLOC_CTX *mem_ctx, struct tevent_req *req);
 221
 222 struct tevent_req *_tevent_req_create(TALLOC_CTX *mem_ctx,
 223                                       void *pstate,
 224                                       size_t state_size,
 225                                       const char *type,
 226                                       const char *location);
 227
 228 #define tevent_req_create(_mem_ctx, _pstate, _type) \
 229         _tevent_req_create((_mem_ctx), (_pstate), sizeof(_type), \
 230                            #_type, __location__)
 231
 232 bool tevent_req_set_endtime(struct tevent_req *req,
 233                             struct tevent_context *ev,
 234                             struct timeval endtime);
 235
 236 void tevent_req_done(struct tevent_req *req);
 237
 238 bool tevent_req_error(struct tevent_req *req,
 239                       uint64_t error);
 240
 241 bool tevent_req_nomem(const void *p,
 242                       struct tevent_req *req);
 243
 244 struct tevent_req *tevent_req_post(struct tevent_req *req,
 245                                    struct tevent_context *ev);
 246
 247 bool tevent_req_is_in_progress(struct tevent_req *req);
 248
 249 bool tevent_req_poll(struct tevent_req *req,
 250                      struct tevent_context *ev);
 251
 252 bool tevent_req_is_error(struct tevent_req *req,
 253                          enum tevent_req_state *state,
 254                          uint64_t *error);
 255
 256 void tevent_req_received(struct tevent_req *req);
 257
 258 struct tevent_req *tevent_wakeup_send(TALLOC_CTX *mem_ctx,
 259                                       struct tevent_context *ev,
 260                                       struct timeval wakeup_time);
 261 bool tevent_wakeup_recv(struct tevent_req *req);
 262
 263 int tevent_timeval_compare(const struct timeval *tv1,
 264                            const struct timeval *tv2);
 265
 266 struct timeval tevent_timeval_zero(void);
 267
 268 struct timeval tevent_timeval_current(void);
 269
 270 struct timeval tevent_timeval_set(uint32_t secs, uint32_t usecs);
 271
 272 struct timeval tevent_timeval_until(const struct timeval *tv1,
 273                                     const struct timeval *tv2);
 274
 275 bool tevent_timeval_is_zero(const struct timeval *tv);
 276
 277 struct timeval tevent_timeval_add(const struct timeval *tv, uint32_t secs,
 278                                   uint32_t usecs);
 279
 280 struct timeval tevent_timeval_current_ofs(uint32_t secs, uint32_t usecs);
 281
 282 struct tevent_queue;
 283
 284 struct tevent_queue *_tevent_queue_create(TALLOC_CTX *mem_ctx,
 285                                           const char *name,
 286                                           const char *location);
 287
 288 #define tevent_queue_create(_mem_ctx, _name) \
 289         _tevent_queue_create((_mem_ctx), (_name), __location__)
 290
 291 typedef void (*tevent_queue_trigger_fn_t)(struct tevent_req *req,
 292                                           void *private_data);
 293 bool tevent_queue_add(struct tevent_queue *queue,
 294                       struct tevent_context *ev,
 295                       struct tevent_req *req,
 296                       tevent_queue_trigger_fn_t trigger,
 297                       void *private_data);
 298 bool tevent_queue_start(struct tevent_queue *queue,
 299                         struct tevent_context *ev);
 300 void tevent_queue_stop(struct tevent_queue *queue);
 301
 302 size_t tevent_queue_length(struct tevent_queue *queue);
 303
 304 #ifdef TEVENT_DEPRECATED
 305 #ifndef _DEPRECATED_
 306 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 307 #define _DEPRECATED_ __attribute__ ((deprecated))
 308 #else
 309 #define _DEPRECATED_
 310 #endif
 311 #endif
 312 void tevent_loop_allow_nesting(struct tevent_context *ev) _DEPRECATED_;
 313 #endif
 314
 315 #ifdef TEVENT_COMPAT_DEFINES
 316
 317 #define event_context   tevent_context
 318 #define event_ops       tevent_ops
 319 #define fd_event        tevent_fd
 320 #define timed_event     tevent_timer
 321 #define signal_event    tevent_signal
 322
 323 #define event_fd_handler_t      tevent_fd_handler_t
 324 #define event_timed_handler_t   tevent_timer_handler_t
 325 #define event_signal_handler_t  tevent_signal_handler_t
 326
 327 #define event_context_init(mem_ctx) \
 328         tevent_context_init(mem_ctx)
 329
 330 #define event_context_init_byname(mem_ctx, name) \
 331         tevent_context_init_byname(mem_ctx, name)
 332
 333 #define event_backend_list(mem_ctx) \
 334         tevent_backend_list(mem_ctx)
 335
 336 #define event_set_default_backend(backend) \
 337         tevent_set_default_backend(backend)
 338
 339 #define event_add_fd(ev, mem_ctx, fd, flags, handler, private_data) \
 340         tevent_add_fd(ev, mem_ctx, fd, flags, handler, private_data)
 341
 342 #define event_add_timed(ev, mem_ctx, next_event, handler, private_data) \
 343         tevent_add_timer(ev, mem_ctx, next_event, handler, private_data)
 344
 345 #define event_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data) \
 346         tevent_add_signal(ev, mem_ctx, signum, sa_flags, handler, private_data)
 347
 348 #define event_loop_once(ev) \
 349         tevent_loop_once(ev)
 350
 351 #define event_loop_wait(ev) \
 352         tevent_loop_wait(ev)
 353
 354 #define event_get_fd_flags(fde) \
 355         tevent_fd_get_flags(fde)
 356
 357 #define event_set_fd_flags(fde, flags) \
 358         tevent_fd_set_flags(fde, flags)
 359
 360 #define EVENT_FD_READ           TEVENT_FD_READ
 361 #define EVENT_FD_WRITE          TEVENT_FD_WRITE
 362
 363 #define EVENT_FD_WRITEABLE(fde) \
 364         TEVENT_FD_WRITEABLE(fde)
 365
 366 #define EVENT_FD_READABLE(fde) \
 367         TEVENT_FD_READABLE(fde)
 368
 369 #define EVENT_FD_NOT_WRITEABLE(fde) \
 370         TEVENT_FD_NOT_WRITEABLE(fde)
 371
 372 #define EVENT_FD_NOT_READABLE(fde) \
 373         TEVENT_FD_NOT_READABLE(fde)
 374
 375 #define ev_debug_level          tevent_debug_level
 376
 377 #define EV_DEBUG_FATAL          TEVENT_DEBUG_FATAL
 378 #define EV_DEBUG_ERROR          TEVENT_DEBUG_ERROR
 379 #define EV_DEBUG_WARNING        TEVENT_DEBUG_WARNING
 380 #define EV_DEBUG_TRACE          TEVENT_DEBUG_TRACE
 381
 382 #define ev_set_debug(ev, debug, context) \
 383         tevent_set_debug(ev, debug, context)
 384
 385 #define ev_set_debug_stderr(_ev) tevent_set_debug_stderr(ev)
 386
 387 #endif /* TEVENT_COMPAT_DEFINES */
 388
 389 #endif /* __TEVENT_H__ */