2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
19 * @defgroup libmemif Example libmemif App
25 /** Libmemif version. */
26 #define LIBMEMIF_VERSION "3.1"
27 /** Default name of application using libmemif. */
28 #define MEMIF_DEFAULT_APP_NAME "libmemif-app"
31 #include <sys/timerfd.h>
36 MEMIF_ERR_SUCCESS = 0, /*!< success */
38 MEMIF_ERR_SYSCALL, /*!< other syscall error */
39 MEMIF_ERR_CONNREFUSED, /*!< connection refused */
40 MEMIF_ERR_ACCES, /*!< permission denied */
41 MEMIF_ERR_NO_FILE, /*!< file does not exist */
42 MEMIF_ERR_FILE_LIMIT, /*!< system open file limit */
43 MEMIF_ERR_PROC_FILE_LIMIT, /*!< process open file limit */
44 MEMIF_ERR_ALREADY, /*!< connection already requested */
45 MEMIF_ERR_AGAIN, /*!< fd is not socket, or operation would block */
46 MEMIF_ERR_BAD_FD, /*!< invalid fd */
47 MEMIF_ERR_NOMEM, /*!< out of memory */
49 MEMIF_ERR_INVAL_ARG, /*!< invalid argument */
50 MEMIF_ERR_NOCONN, /*!< handle points to no connection */
51 MEMIF_ERR_CONN, /*!< handle points to existing connection */
52 MEMIF_ERR_CB_FDUPDATE, /*!< user defined callback memif_control_fd_update_t error */
53 MEMIF_ERR_FILE_NOT_SOCK, /*!< file specified by socket filename
54 exists, but it's not socket */
55 MEMIF_ERR_NO_SHMFD, /*!< missing shm fd */
56 MEMIF_ERR_COOKIE, /*!< wrong cookie on ring */
57 MEMIF_ERR_NOBUF_RING, /*!< ring buffer full */
58 MEMIF_ERR_NOBUF, /*!< not enough memif buffers */
59 MEMIF_ERR_NOBUF_DET, /*!< memif details needs larger buffer */
60 MEMIF_ERR_INT_WRITE, /*!< send interrupt error */
61 MEMIF_ERR_MFMSG, /*!< malformed msg received */
62 MEMIF_ERR_QID, /*!< invalid queue id */
63 /* MEMIF PROTO ERRORS */
64 MEMIF_ERR_PROTO, /*!< incompatible protocol version */
65 MEMIF_ERR_ID, /*!< unmatched interface id */
66 MEMIF_ERR_ACCSLAVE, /*!< slave cannot accept connection requests */
67 MEMIF_ERR_ALRCONN, /*!< memif is already connected */
68 MEMIF_ERR_MODE, /*!< mode mismatch */
69 MEMIF_ERR_SECRET, /*!< secret mismatch */
70 MEMIF_ERR_NOSECRET, /*!< secret required */
71 MEMIF_ERR_MAXREG, /*!< max region limit reached */
72 MEMIF_ERR_MAXRING, /*!< max ring limit reached */
73 MEMIF_ERR_NO_INTFD, /*!< missing interrupt fd */
74 MEMIF_ERR_DISCONNECT, /*!< disconnect received */
75 MEMIF_ERR_DISCONNECTED, /*!< peer interface disconnected */
76 MEMIF_ERR_UNKNOWN_MSG, /*!< unknown message type */
77 MEMIF_ERR_POLL_CANCEL, /*!< memif_poll_event() was cancelled */
78 MEMIF_ERR_MAX_RING, /*!< too large ring size */
79 MEMIF_ERR_PRIVHDR, /*!< private hdrs not supported */
83 * @defgroup MEMIF_FD_EVENT Types of events that need to be watched for specific fd.
88 /** user needs to set events that occurred on fd and pass them to memif_control_fd_handler */
89 #define MEMIF_FD_EVENT_READ (1 << 0)
90 #define MEMIF_FD_EVENT_WRITE (1 << 1)
91 /** inform libmemif that error occurred on fd */
92 #define MEMIF_FD_EVENT_ERROR (1 << 2)
93 /** if set, informs that fd is going to be closed (user may want to stop watching for events on this fd) */
94 #define MEMIF_FD_EVENT_DEL (1 << 3)
96 #define MEMIF_FD_EVENT_MOD (1 << 4)
99 /** \brief Memif per thread main handle
100 Pointer of type void, pointing to internal structure.
101 Used to identify internal per thread database.
103 typedef void *memif_per_thread_main_handle_t;
105 /** \brief Memif connection handle
106 pointer of type void, pointing to internal structure
108 typedef void *memif_conn_handle_t;
110 /** \brief Memif socket handle
111 pointer of type void, pointing to internal structure
113 typedef void *memif_socket_handle_t;
115 /** \brief Memif allocator alloc
116 @param size - requested allocation size
118 custom memory allocator: alloc function template
120 typedef void *(memif_alloc_t) (size_t size);
123 /** \brief Memif realloc
124 @param ptr - pointer to memory block
125 @param size - requested allocation size
127 custom memory reallocation
129 typedef void *(memif_realloc_t) (void *ptr, size_t size);
131 /** \brief Memif allocator free
132 @param size - requested allocation size
134 custom memory allocator: free function template
136 typedef void (memif_free_t) (void *ptr);
139 * @defgroup CALLBACKS Callback functions definitions
145 /** \brief Memif control file descriptor update (callback function)
146 @param fd - new file descriptor to watch
147 @param events - event type(s) to watch for
148 @param private_ctx - libmemif main private context. Is NULL for
149 libmemif main created by memif_init()
152 This callback is called when there is new fd to watch for events on
153 or if fd is about to be closed (user mey want to stop watching for events on this fd).
154 Private context is taken from libmemif_main, 'private_ctx' passed to memif_per_thread_init()
155 or NULL in case of memif_init()
157 typedef int (memif_control_fd_update_t) (int fd, uint8_t events,
160 /** \brief Memif connection status update (callback function)
161 @param conn - memif connection handle
162 @param private_ctx - private context
164 Informs user about connection status connected/disconnected.
165 On connected -> start watching for events on interrupt fd (optional).
167 typedef int (memif_connection_update_t) (memif_conn_handle_t conn,
170 /** \brief Memif interrupt occurred (callback function)
171 @param conn - memif connection handle
172 @param private_ctx - private context
173 @param qid - queue id on which interrupt occurred
175 Called when event is received on interrupt fd.
177 typedef int (memif_interrupt_t) (memif_conn_handle_t conn, void *private_ctx,
183 * @defgroup EXTERNAL_REGION External region APIs
189 /** \brief Get external buffer offset (optional)
190 @param private_ctx - private context
192 Find unallocated external buffer and return its offset.
194 typedef uint32_t (memif_get_external_buffer_offset_t) (void *private_ctx);
196 /** \brief Add external region
197 @param[out] addr - region address
198 @param size - requested region size
199 @param fd[out] - file descriptor
200 @param private_ctx - private context
202 Called by slave. Add external region created by client.
204 typedef int (memif_add_external_region_t) (void * *addr, uint32_t size,
205 int *fd, void *private_ctx);
207 /** \brief Get external region address
208 @param size - requested region size
209 @param fd - file descriptor
210 @param private_ctx - private context
212 Called by master. Get region address from client.
214 \return region address
216 typedef void *(memif_get_external_region_addr_t) (uint32_t size, int fd,
219 /** \brief Delete external region
220 @param addr - region address
221 @param size - region size
222 @param fd - file descriptor
223 @param private_ctx - private context
225 Delete external region.
227 typedef int (memif_del_external_region_t) (void *addr, uint32_t size, int fd,
230 /** \brief Register external region
231 @param ar - add external region callback
232 @param gr - get external region addr callback
233 @param dr - delete external region callback
234 @param go - get external buffer offset callback (optional)
236 void memif_register_external_region (memif_add_external_region_t * ar,
237 memif_get_external_region_addr_t * gr,
238 memif_del_external_region_t * dr,
239 memif_get_external_buffer_offset_t * go);
241 /** \brief Register external region
242 @param pt_main - per thread main handle
243 @param ar - add external region callback
244 @param gr - get external region addr callback
245 @param dr - delete external region callback
246 @param go - get external buffer offset callback (optional)
248 void memif_per_thread_register_external_region (memif_per_thread_main_handle_t
250 memif_add_external_region_t *
252 memif_get_external_region_addr_t
254 memif_del_external_region_t *
256 memif_get_external_buffer_offset_t
262 * @defgroup ARGS_N_BUFS Connection arguments and buffers
271 MEMIF_INTERFACE_MODE_ETHERNET = 0,
272 MEMIF_INTERFACE_MODE_IP = 1,
273 MEMIF_INTERFACE_MODE_PUNT_INJECT = 2,
274 } memif_interface_mode_t;
275 #endif /* _MEMIF_H_ */
277 /** \brief Memif connection arguments
278 @param socket - Memif socket handle, if NULL default socket will be used.
279 Default socket is only supported in global database (see memif_init).
280 Custom database does not create a default socket
281 (see memif_per_thread_init).
282 Memif connection is stored in the same database as the socket.
283 @param secret - optional parameter used as interface authentication
284 @param num_s2m_rings - number of slave to master rings
285 @param num_m2s_rings - number of master to slave rings
286 @param buffer_size - size of buffer in shared memory
287 @param log2_ring_size - logarithm base 2 of ring size
288 @param is_master - 0 == master, 1 == slave
289 @param interface_id - id used to identify peer connection
290 @param interface_name - interface name
291 @param mode - 0 == ethernet, 1 == ip , 2 == punt/inject
295 memif_socket_handle_t socket; /*!< default = /run/vpp/memif.sock */
296 uint8_t secret[24]; /*!< optional (interface authentication) */
298 uint8_t num_s2m_rings; /*!< default = 1 */
299 uint8_t num_m2s_rings; /*!< default = 1 */
300 uint16_t buffer_size; /*!< default = 2048 */
301 uint8_t log2_ring_size; /*!< default = 10 (1024) */
304 uint32_t interface_id;
305 uint8_t interface_name[32];
306 memif_interface_mode_t mode:8;
309 /*! memif receive mode */
312 MEMIF_RX_MODE_INTERRUPT = 0, /*!< interrupt mode */
313 MEMIF_RX_MODE_POLLING /*!< polling mode */
316 /** \brief Memif buffer
317 @param desc_index - ring descriptor index
318 @param ring - pointer to ring containing descriptor for this buffer
319 @param len - available length
320 @param flags - memif buffer flags
321 @param data - pointer to shared memory data
328 /** next buffer present (chained buffers) */
329 #define MEMIF_BUFFER_FLAG_NEXT (1 << 0)
336 * @defgroup MEMIF_DETAILS Memif details structs
342 /** \brief Memif queue details
343 @param region - region index
344 @param qid - queue id
345 @param ring_size - size of ring buffer in shared memory
346 @param flags - ring flags
347 @param head - ring head pointer
348 @param tail - ring tail pointer
349 @param buffer_size - buffer size on shared memory
356 /** if set queue is in polling mode, else in interrupt mode */
357 #define MEMIF_QUEUE_FLAG_POLLING 1
361 uint16_t buffer_size;
362 } memif_queue_details_t;
364 /** \brief Memif region details
365 @param index - region index
366 @param addr - region address
367 @param size - region size
368 @param fd - file descriptor
369 @param is_external - if not zero then region is defined by client
378 } memif_region_details_t;
380 /** \brief Memif details
381 @param if_name - interface name
382 @param inst_name - application name
383 @param remote_if_name - peer interface name
384 @param remote_inst_name - peer application name
385 @param id - connection id
386 @param secret - secret
387 @param role - 0 = master, 1 = slave
388 @param mode - 0 = ethernet, 1 = ip , 2 = punt/inject
389 @param socket_filename - socket filename
390 @param regions_num - number of regions
391 @param regions - struct containing region details
392 @param rx_queues_num - number of receive queues
393 @param tx_queues_num - number of transmit queues
394 @param rx_queues - struct containing receive queue details
395 @param tx_queues - struct containing transmit queue details
396 @param error - error string
397 @param link_up_down - 1 = up (connected), 2 = down (disconnected)
403 uint8_t *remote_if_name;
404 uint8_t *remote_inst_name;
407 uint8_t *secret; /* optional */
408 uint8_t role; /* 0 = master, 1 = slave */
409 uint8_t mode; /* 0 = ethernet, 1 = ip, 2 = punt/inject */
410 uint8_t *socket_filename;
412 memif_region_details_t *regions;
413 uint8_t rx_queues_num;
414 uint8_t tx_queues_num;
415 memif_queue_details_t *rx_queues;
416 memif_queue_details_t *tx_queues;
419 uint8_t link_up_down; /* 1 = up, 0 = down */
424 * @defgroup API_CALLS Api calls
430 /** \brief Memif get version
432 \return ((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
434 uint16_t memif_get_version ();
436 /** \brief Memif get queue event file descriptor
437 @param conn - memif connection handle
438 @param qid - queue id
439 @param[out] fd - returns event file descriptor
444 int memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *fd);
446 /** \brief Memif set rx mode
447 @param conn - memif connection handle
448 @param rx_mode - receive mode
449 @param qid - queue id
453 int memif_set_rx_mode (memif_conn_handle_t conn, memif_rx_mode_t rx_mode,
456 /** \brief Memif strerror
457 @param err_code - error code
459 Converts error code to error message.
463 char *memif_strerror (int err_code);
465 /** \brief Memif get details
466 @param conn - memif connection handle
467 @param md - pointer to memif details struct
468 @param buf - buffer containing details strings
469 @param buflen - length of buffer
473 int memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
474 char *buf, ssize_t buflen);
476 /** \brief Memif initialization
477 @param on_control_fd_update - if control fd updates inform user to watch new fd
478 @param app_name - application name (will be truncated to 32 chars)
479 @param memif_alloc - custom memory allocator, NULL = default
480 @param memif_realloc - custom memory reallocation, NULL = default
481 @param memif_free - custom memory free, NULL = default
483 if param on_control_fd_update is set to NULL,
484 libmemif will handle file descriptor event polling
485 if a valid callback is set, file descriptor event polling needs to be done by
486 user application, all file descriptors and event types will be passed in
487 this callback to user application
489 Initialize internal libmemif structures. Create timerfd (used to periodically request connection by
490 disconnected memifs in slave mode, with no additional API call). This fd is passed to user with memif_control_fd_update_t
491 timer is inactive at this state. It activates with if there is at least one memif in slave mode.
495 int memif_init (memif_control_fd_update_t * on_control_fd_update,
496 char *app_name, memif_alloc_t * memif_alloc,
497 memif_realloc_t * memif_realloc, memif_free_t * memif_free);
499 /** \brief Memif per thread initialization
500 @param pt_main - per thread main handle
501 @param private_ctx - private context
502 @param on_control_fd_update - if control fd updates inform user to watch new fd
503 @param app_name - application name (will be truncated to 32 chars)
504 @param memif_alloc - custom memory allocator, NULL = default
505 @param memif_realloc - custom memory reallocation, NULL = default
506 @param memif_free - custom memory free, NULL = default
508 Per thread version of memif_init ().
509 Instead of using global database, creates and initializes unique database,
510 identified by 'memif_per_thread_main_handle_t'.
514 int memif_per_thread_init (memif_per_thread_main_handle_t * pt_main,
516 memif_control_fd_update_t * on_control_fd_update,
517 char *app_name, memif_alloc_t * memif_alloc,
518 memif_realloc_t * memif_realloc,
519 memif_free_t * memif_free);
521 /** \brief Memif cleanup
523 Free libmemif internal allocations.
527 int memif_cleanup ();
529 /** \brief Memif per thread cleanup
530 @param pt_main - per thread main handle
532 Free libmemif internal allocations and sets the handle to NULL.
536 int memif_per_thread_cleanup (memif_per_thread_main_handle_t * pt_main);
538 /** \brief Memory interface create function
539 @param conn - connection handle for client app
540 @param args - memory interface connection arguments
541 @param on_connect - inform user about connected status
542 @param on_disconnect - inform user about disconnected status
543 @param on_interrupt - informs user about interrupt, if set to null user will not be notified about interrupt, user can use memif_get_queue_efd call to get interrupt fd to poll for events
544 @param private_ctx - private context passed back to user with callback
546 Creates memory interface.
549 Start timer that will send events to timerfd. If this fd is passed to memif_control_fd_handler
550 every disconnected memif in slave mode will send connection request.
551 On success new fd is passed to user with memif_control_fd_update_t.
554 Create listener socket and pass fd to user with memif_control_fd_update_t.
555 If this fd is passed to memif_control_fd_handler accept will be called and
556 new fd will be passed to user with memif_control_fd_update_t.
561 int memif_create (memif_conn_handle_t * conn, memif_conn_args_t * args,
562 memif_connection_update_t * on_connect,
563 memif_connection_update_t * on_disconnect,
564 memif_interrupt_t * on_interrupt, void *private_ctx);
566 /** \brief Memif control file descriptor handler
567 @param fd - file descriptor on which the event occurred
568 @param events - event type(s) that occurred
570 If event occurs on any control fd, call memif_control_fd_handler.
571 Internal - lib will "identify" fd (timerfd, listener, control) and handle event accordingly.
575 Every disconnected memif in slave mode will request connection.
576 LISTENER or CONTROL -
577 Handle socket messaging (internal connection establishment).
579 Call on_interrupt callback (if set).
584 int memif_control_fd_handler (int fd, uint8_t events);
586 /** \brief Memif per thread control file descriptor handler
587 @param pt_main - per thread main handle
588 @param fd - file descriptor on which the event occurred
589 @param events - event type(s) that occurred
591 Per thread version of memif_control_fd_handler.
596 int memif_per_thread_control_fd_handler (memif_per_thread_main_handle_t
597 pt_main, int fd, uint8_t events);
599 /** \brief Memif delete
600 @param conn - pointer to memif connection handle
603 disconnect session (free queues and regions, close file descriptors, unmap shared memory)
604 set connection handle to NULL, to avoid possible double free
608 int memif_delete (memif_conn_handle_t * conn);
610 /** \brief Memif buffer enq tx
611 @param conn - memif connection handle
612 @param qid - number identifying queue
613 @param bufs - memif buffers
614 @param count - number of memif buffers to enqueue
615 @param count_out - returns number of allocated buffers
617 Enqueue buffers to specified tx queue. Can only be used by slave.
618 Updates desc_index field for each memif buffer.
619 If connection handle points to master returns MEMIF_ERR_INVAL_ARG.
623 int memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
624 memif_buffer_t * bufs, uint16_t count,
625 uint16_t * count_out);
627 /** \brief Memif buffer enq tx at idx
628 @param conn - memif connection handle
629 @param buf_a - memif buffer
630 @param buf_b - memif buffer
632 Swap descriptors for provided buffers and update the buffers
634 int memif_buffer_requeue (memif_conn_handle_t conn, memif_buffer_t *buf_a,
635 memif_buffer_t *buf_b);
637 /** \brief Memif buffer alloc
638 @param conn - memif connection handle
639 @param qid - number identifying queue
640 @param bufs - memif buffers
641 @param count - number of memif buffers to allocate
642 @param count_out - returns number of allocated buffers
643 @param size - buffer size, may return chained buffers if size > buffer_size
647 int memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
648 memif_buffer_t * bufs, uint16_t count,
649 uint16_t * count_out, uint16_t size);
651 /** \brief Memif refill queue
652 @param conn - memif connection handle
653 @param qid - number identifying queue
654 @param count - number of buffers to be placed on ring
655 @param headroom - offset the buffer by headroom
659 int memif_refill_queue (memif_conn_handle_t conn, uint16_t qid,
660 uint16_t count, uint16_t headroom);
662 /** \brief Memif transmit buffer burst
663 @param conn - memif connection handle
664 @param qid - number identifying queue
665 @param bufs - memif buffers
666 @param count - number of memif buffers to transmit
667 @param tx - returns number of transmitted buffers
671 int memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
672 memif_buffer_t * bufs, uint16_t count, uint16_t * tx);
674 /** \brief Memif receive buffer burst
675 @param conn - memif connection handle
676 @param qid - number identifying queue
677 @param bufs - memif buffers
678 @param count - number of memif buffers to receive
679 @param rx - returns number of received buffers
681 Consume interrupt event for receive queue.
682 The event is not consumed, if memif_rx_burst fails.
686 int memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
687 memif_buffer_t * bufs, uint16_t count, uint16_t * rx);
689 /** \brief Memif poll event
690 @param timeout - timeout in seconds
692 Passive event polling -
693 timeout = 0 - dont wait for event, check event queue if there is an event and return.
694 timeout = -1 - wait until event
698 int memif_poll_event (int timeout);
700 /** \brief Memif per thread poll event
701 @param pt_main - per thread main handle
702 @param timeout - timeout in seconds
704 Per thread version of memif_poll_event.
708 int memif_per_thread_poll_event (memif_per_thread_main_handle_t pt_main,
711 /** \brief Send signal to stop concurrently running memif_poll_event().
713 The function, however, does not wait for memif_poll_event() to stop.
714 memif_poll_event() may still return simply because an event has occurred
715 or the timeout has elapsed, but if called repeatedly in an infinite loop,
716 a canceled memif_poll_event() is guaranteed to return MEMIF_ERR_POLL_CANCEL
717 in the shortest possible time.
718 This feature was not available in the first release.
719 Use macro MEMIF_HAVE_CANCEL_POLL_EVENT to check if the feature is present.
723 #define MEMIF_HAVE_CANCEL_POLL_EVENT 1
724 int memif_cancel_poll_event ();
725 /** \brief Send signal to stop concurrently running memif_poll_event().
726 @param pt_main - per thread main handle
728 Per thread version of memif_cancel_poll_event.
732 int memif_per_thread_cancel_poll_event (memif_per_thread_main_handle_t
735 /** \brief Set connection request timer value
736 @param timer - new timer value
738 Timer on which all disconnected slaves request connection.
739 See system call 'timer_settime' man-page.
743 int memif_set_connection_request_timer (struct itimerspec timer);
745 /** \brief Set connection request timer value
746 @param pt_main - per thread main handle
747 @param timer - new timer value
749 Per thread version of memif_set_connection_request_timer
754 memif_per_thread_set_connection_request_timer (memif_per_thread_main_handle_t
756 struct itimerspec timer);
758 /** \brief Send connection request
759 @param conn - memif connection handle
761 Only slave interface can request connection.
765 int memif_request_connection (memif_conn_handle_t conn);
767 /** \brief Create memif socket
768 @param sock - socket handle for client app
769 @param filename - path to socket file
770 @param private_ctx - private context
772 The first time an interface is assigned a socket, its type is determined.
773 For master role it's 'listener', for slave role it's 'client'. Each interface
774 requires socket of its respective type. Default socket is created if no
775 socket handle is passed to memif_create(). It's private context is NULL.
776 If all interfaces using this socket are deleted, the socket returns
777 to its default state.
781 int memif_create_socket (memif_socket_handle_t * sock, const char *filename,
784 /** \brief Create memif socket
785 @param pt_main - per thread main handle
786 @param sock - socket handle for client app
787 @param filename - path to socket file
788 @param private_ctx - private context
790 Per thread version of memif_create_socket.
794 int memif_per_thread_create_socket (memif_per_thread_main_handle_t pt_main,
795 memif_socket_handle_t * sock,
796 const char *filename, void *private_ctx);
798 /** \brief Delete memif socket
799 @param sock - socket handle for client app
801 When trying to free socket in use, socket will not be freed and
802 MEMIF_ERR_INVAL_ARG is returned.
806 int memif_delete_socket (memif_socket_handle_t * sock);
808 /** \brief Get socket filename
809 @param sock - socket handle for client app
811 Return constant pointer to socket filename.
815 const char *memif_get_socket_filename (memif_socket_handle_t sock);
819 #endif /* _LIBMEMIF_H_ */