1 /* Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file afs.c Paraslash's audio file selector. */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
12 #include <arpa/inet.h>
17 #include "server.lsg.h"
18 #include "server_cmd.lsg.h"
37 * The array of tables of the audio file selector.
39 * We organize them in an array to be able to loop over all tables.
41 static const struct afs_table {
42 /** The name is no table operation, so define it here. */
43 const char * const name;
44 /** The only way to invoke the ops is via this pointer. */
45 const struct afs_table_operations *ops;
47 {.name = "audio_files", .ops = &aft_ops},
48 {.name = "attributes", .ops = &attr_ops},
49 {.name = "scores", .ops = &score_ops},
50 {.name = "moods", .ops = &moods_ops},
51 {.name = "lyrics", .ops = &lyrics_ops},
52 {.name = "images", .ops = &images_ops},
53 {.name = "playlists", .ops = &playlists_ops},
55 /** Used to loop over the afs tables. */
56 #define NUM_AFS_TABLES ARRAY_SIZE(afs_tables)
59 /** The file descriptor for the local socket. */
61 /** The associated task structure. */
66 extern struct misc_meta_data *mmd;
68 static int server_socket;
69 static struct command_task command_task_struct;
70 static struct signal_task *signal_task;
72 static enum play_mode current_play_mode;
73 static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
75 extern uint32_t afs_socket_cookie;
78 * Passed from command handlers to afs.
80 * Command handlers cannot change the afs database directly because they run in
81 * a separate process. The callback query structure circumvents this
82 * restriction as follows. To instruct the afs process to execute a particular
83 * function, the command hander writes an instance of this structure to a
84 * shared memory area, along with the arguments to the callback function. The
85 * identifier of the shared memory area is transferred to the afs process via
88 * The afs process reads the shared memory id from the command socket, attaches
89 * the corresponding area, and calls the callback function whose address is
92 * The command output, if any, is transferred back to the command handler in
93 * the same way: The afs process writes the output to a second shared memory
94 * area together with a fixed size metadata header whose format corresponds to
95 * the \ref callback_result structure. The identifier of this area is sent back
96 * to the command handler which attaches the area and forwards the output to
99 * \sa \ref struct callback_result.
101 struct callback_query {
102 /** The function to be called. */
104 /** The number of bytes of the query */
109 * Structure embedded in the result of a callback.
111 * If the callback produced a result, an instance of that structure is embedded
112 * into the shared memory area holding the result, mainly to let the command
113 * handler know the size of the result.
115 * \sa \ref struct callback_query.
117 struct callback_result {
118 /** The number of bytes of the result. */
120 /** The band designator (loglevel for the result). */
124 static int dispatch_result(int result_shmid, callback_result_handler *handler,
125 void *private_result_data)
127 struct osl_object result;
129 /* must attach r/w as result.data might get encrypted in-place. */
130 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
131 struct callback_result *cr = result_shm;
134 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
137 result.size = cr->result_size;
138 result.data = result_shm + sizeof(*cr);
140 ret = handler(&result, cr->band, private_result_data);
141 ret2 = shm_detach(result_shm);
143 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
151 * Ask the afs process to call a given function.
153 * \param f The function to be called.
154 * \param query Pointer to arbitrary data for the callback.
155 * \param result_handler Called for each shm area sent by the callback.
156 * \param private_result_data Passed verbatim to \a result_handler.
158 * This function creates a socket for communication with the afs process and a
159 * shared memory area (sma) to which the buffer pointed to by \a query is
160 * copied. It then notifies the afs process that the callback function \a f
161 * should be executed by sending the shared memory identifier (shmid) to the
164 * If the callback produces a result, it sends any number of shared memory
165 * identifiers back via the socket. For each such identifier received, \a
166 * result_handler is called. The contents of the sma identified by the received
167 * shmid are passed to that function as an osl object. The private_result_data
168 * pointer is passed as the second argument to \a result_handler.
170 * \return Number of shared memory areas dispatched on success, negative on
173 int send_callback_request(afs_callback *f, struct osl_object *query,
174 callback_result_handler *result_handler,
175 void *private_result_data)
177 struct callback_query *cq;
178 int ret, fd = -1, query_shmid, result_shmid;
180 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
181 size_t query_shm_size = sizeof(*cq);
182 int dispatch_error = 0, num_dispatched = 0;
185 query_shm_size += query->size;
186 ret = shm_new(query_shm_size);
190 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
195 cq->query_size = query_shm_size - sizeof(*cq);
198 memcpy(query_shm + sizeof(*cq), query->data, query->size);
199 ret = shm_detach(query_shm);
203 *(uint32_t *)buf = afs_socket_cookie;
204 *(int *)(buf + sizeof(afs_socket_cookie)) = query_shmid;
206 ret = connect_local_socket(OPT_STRING_VAL(AFS_SOCKET));
210 ret = write_all(fd, buf, sizeof(buf));
214 * Read all shmids from afs.
216 * Even if the dispatcher returns an error we _must_ continue to read
217 * shmids from fd so that we can destroy all shared memory areas that
218 * have been created for us by the afs process.
221 ret = recv_bin_buffer(fd, buf, sizeof(int));
224 assert(ret == sizeof(int));
228 ret = dispatch_result(result_shmid, result_handler,
229 private_result_data);
230 if (ret < 0 && dispatch_error >= 0)
231 dispatch_error = ret;
232 ret = shm_destroy(result_shmid);
234 PARA_CRIT_LOG("destroy result failed: %s\n",
235 para_strerror(-ret));
239 if (shm_destroy(query_shmid) < 0)
240 PARA_CRIT_LOG("shm destroy error\n");
243 if (dispatch_error < 0)
244 return dispatch_error;
247 return num_dispatched;
251 * Wrapper for send_callback_request() which passes a lopsub parse result.
253 * \param f The callback function.
254 * \param cmd Needed for (de-)serialization.
255 * \param lpr Must match cmd.
256 * \param private_result_data Passed to send_callback_request().
258 * This function serializes the parse result given by the lpr pointer into a
259 * buffer. The buffer is sent as the query to the afs process with the callback
262 * \return The return value of the underlying call to send_callback_request().
264 int send_lls_callback_request(afs_callback *f,
265 const struct lls_command * const cmd,
266 struct lls_parse_result *lpr, void *private_result_data)
268 struct osl_object query;
270 int ret = lls_serialize_parse_result(lpr, cmd, &buf, &query.size);
274 ret = send_callback_request(f, &query, afs_cb_result_handler,
275 private_result_data);
280 static int action_if_pattern_matches(struct osl_row *row, void *data)
282 struct pattern_match_data *pmd = data;
283 struct osl_object name_obj;
284 const char *p, *name;
287 ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num,
291 name = (char *)name_obj.data;
292 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
294 if (lls_num_inputs(pmd->lpr) == 0) {
295 if (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING) {
297 return pmd->action(pmd->table, row, name, pmd->data);
302 if (i >= lls_num_inputs(pmd->lpr))
304 p = lls_input(i, pmd->lpr);
305 ret = fnmatch(p, name, pmd->fnmatch_flags);
306 if (ret != FNM_NOMATCH) {
309 ret = pmd->action(pmd->table, row, name, pmd->data);
321 * Execute the given function for each matching row.
323 * \param pmd Describes what to match and how.
327 int for_each_matching_row(struct pattern_match_data *pmd)
329 if (pmd->pm_flags & PM_REVERSE_LOOP)
330 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
331 action_if_pattern_matches));
332 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
333 action_if_pattern_matches));
337 * Compare two osl objects of string type.
339 * \param obj1 Pointer to the first object.
340 * \param obj2 Pointer to the second object.
342 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
343 * are taken into account.
345 * \return It returns an integer less than, equal to, or greater than zero if
346 * \a obj1 is found, respectively, to be less than, to match, or be greater than
349 * \sa strcmp(3), strncmp(3).
351 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
353 const char *str1 = obj1->data;
354 const char *str2 = obj2->data;
355 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
358 static int pass_afd(int fd, char *buf, size_t size)
360 struct msghdr msg = {.msg_iov = NULL};
361 struct cmsghdr *cmsg;
362 char control[255] __a_aligned(8);
372 msg.msg_control = control;
373 msg.msg_controllen = sizeof(control);
375 cmsg = CMSG_FIRSTHDR(&msg);
376 cmsg->cmsg_level = SOL_SOCKET;
377 cmsg->cmsg_type = SCM_RIGHTS;
378 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
379 *(int *)CMSG_DATA(cmsg) = fd;
381 /* Sum of the length of all control messages in the buffer */
382 msg.msg_controllen = cmsg->cmsg_len;
383 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
384 ret = sendmsg(server_socket, &msg, 0);
386 ret = -ERRNO_TO_PARA_ERROR(errno);
393 * Pass the fd of the next audio file to the server process.
395 * This stores all information for streaming the "best" audio file in a shared
396 * memory area. The id of that area and an open file descriptor for the next
397 * audio file are passed to the server process.
401 * \sa \ref open_and_update_audio_file().
403 static int open_next_audio_file(void)
408 ret = open_and_update_audio_file(&fd);
410 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
411 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
412 goto no_admissible_files;
415 if (!write_ok(server_socket)) {
419 *(uint32_t *)buf = NEXT_AUDIO_FILE;
420 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
421 ret = pass_afd(fd, buf, 8);
429 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
430 *(uint32_t *)(buf + 4) = (uint32_t)0;
431 return write_all(server_socket, buf, 8);
434 static int activate_mood_or_playlist(const char *arg, struct para_buffer *pb)
441 ret = mood_load(NULL, &msg);
442 mode = PLAY_MODE_MOOD;
443 } else if (!strncmp(arg, "p/", 2)) {
444 ret = playlist_load(arg + 2, &msg);
445 mode = PLAY_MODE_PLAYLIST;
446 } else if (!strncmp(arg, "m/", 2)) {
447 ret = mood_load(arg + 2, &msg);
448 mode = PLAY_MODE_MOOD;
450 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
451 msg = make_message("%s: parse error", arg);
454 para_printf(pb, "%s", msg);
458 current_play_mode = mode;
460 * We get called with arg == current_mop from the signal dispatcher
461 * after SIGHUP and from the error path of the select command to
462 * re-select the current mood or playlist. In this case the assignment
463 * to current_mop below would result in a use-after-free condition.
465 if (arg != current_mop) {
467 current_mop = arg? para_strdup(arg) : NULL;
469 /* Notify the server about the mood/playlist change. */
470 mutex_lock(mmd_mutex);
471 strncpy(mmd->afs_mode_string, arg? arg: "dummy",
472 sizeof(mmd->afs_mode_string));
473 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
475 mutex_unlock(mmd_mutex);
480 * Result handler for sending data to the para_client process.
482 * \param result The data to be sent.
483 * \param band The band designator.
484 * \param private Pointer to the command context.
486 * \return The return value of the underlying call to \ref command.c::send_sb.
488 * \sa \ref callback_result_handler, \ref command.c::send_sb.
490 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
493 struct command_context *cc = private;
501 case SBD_WARNING_LOG:
505 assert(result->size > 0);
506 return send_sb(&cc->scc, result->data, result->size, band, true);
507 case SBD_AFS_CB_FAILURE:
508 return *(int *)(result->data);
514 static void flush_and_free_pb(struct para_buffer *pb)
517 struct afs_max_size_handler_data *amshd = pb->private_data;
519 if (pb->buf && pb->size > 0) {
520 ret = pass_buffer_as_shm(amshd->fd, amshd->band, pb->buf,
523 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
528 static void init_admissible_files(const char *arg)
530 int ret = activate_mood_or_playlist(arg, NULL);
532 PARA_WARNING_LOG("could not activate %s: %s\n", arg,
533 para_strerror(-ret));
535 activate_mood_or_playlist(NULL, NULL);
539 static int setup_command_socket_or_die(void)
542 const char *socket_name = OPT_STRING_VAL(AFS_SOCKET);
545 ret = create_local_socket(socket_name);
547 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
551 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
556 static char *database_dir;
558 static void close_afs_tables(void)
561 PARA_NOTICE_LOG("closing afs tables\n");
562 for (i = 0; i < NUM_AFS_TABLES; i++)
563 afs_tables[i].ops->close();
568 static void get_database_dir(void)
571 if (OPT_GIVEN(AFS_DATABASE_DIR))
572 database_dir = para_strdup(OPT_STRING_VAL(AFS_DATABASE_DIR));
574 char *home = para_homedir();
575 database_dir = make_message(
576 "%s/.paraslash/afs_database-0.7", home);
580 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
583 static int open_afs_tables(void)
588 PARA_NOTICE_LOG("opening %zu osl tables in %s\n", NUM_AFS_TABLES,
590 for (i = 0; i < NUM_AFS_TABLES; i++) {
591 ret = afs_tables[i].ops->open(database_dir);
594 PARA_ERROR_LOG("could not open %s\n", afs_tables[i].name);
600 afs_tables[--i].ops->close();
604 static int afs_signal_post_monitor(struct sched *s, __a_unused void *context)
608 if (getppid() == 1) {
609 PARA_EMERG_LOG("para_server died\n");
612 signum = para_next_signal();
615 if (signum == SIGHUP) {
617 parse_config_or_die(1);
618 ret = open_afs_tables();
621 init_admissible_files(current_mop);
624 PARA_EMERG_LOG("terminating on signal %d\n", signum);
626 task_notify_all(s, E_AFS_SIGNAL);
627 return -E_AFS_SIGNAL;
630 static void register_signal_task(struct sched *s)
632 para_sigaction(SIGPIPE, SIG_IGN);
633 signal_task = signal_init_or_die();
634 para_install_sighandler(SIGINT);
635 para_install_sighandler(SIGTERM);
636 para_install_sighandler(SIGHUP);
638 signal_task->task = task_register(&(struct task_info) {
640 .pre_monitor = signal_pre_monitor,
641 .post_monitor = afs_signal_post_monitor,
642 .context = signal_task,
647 static struct list_head afs_client_list;
649 /** Describes one connected afs client. */
651 /** Position in the afs client list. */
652 struct list_head node;
653 /** The socket file descriptor for this client. */
655 /** The time the client connected. */
656 struct timeval connect_time;
659 static void command_pre_monitor(struct sched *s, void *context)
661 struct command_task *ct = context;
662 struct afs_client *client;
664 sched_monitor_readfd(server_socket, s);
665 sched_monitor_readfd(ct->fd, s);
666 list_for_each_entry(client, &afs_client_list, node)
667 sched_monitor_readfd(client->fd, s);
671 * Send data as shared memory to a file descriptor.
673 * \param fd File descriptor to send the shmid to.
674 * \param band The band designator for this data.
675 * \param buf The buffer holding the data to be sent.
676 * \param size The size of \a buf.
678 * This function creates a shared memory area large enough to hold
679 * the content given by \a buf and \a size and sends the identifier
680 * of this area to the file descriptor \a fd.
682 * It is called by the AFS max_size handler as well as directly by the AFS
683 * command callbacks to send command output to the command handlers.
685 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
686 * and positive on success.
688 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
692 struct callback_result *cr;
695 assert(band != SBD_OUTPUT);
696 ret = shm_new(size + sizeof(*cr));
700 ret = shm_attach(shmid, ATTACH_RW, &shm);
704 cr->result_size = size;
707 memcpy(shm + sizeof(*cr), buf, size);
708 ret = shm_detach(shm);
711 ret = write_all(fd, (char *)&shmid, sizeof(int));
715 if (shm_destroy(shmid) < 0)
716 PARA_ERROR_LOG("destroy result failed\n");
721 * Format and send an error message to the command handler.
723 * To pass an error message from the callback of an afs command to the client,
724 * this function should be called. It formats the message into a buffer which
725 * is passed as a shared memory area to the command handler from where it
726 * propagates to the client.
728 * The message will be tagged with the ERROR_LOG sideband designator so that
729 * the client writes it to its stderr stream rather than to stdout as with
730 * aca->pbout. In analogy to the default Unix semantics of stderr, the message
731 * is sent without buffering.
733 * If sending the error message fails, an error is logged on the server side,
734 * but no other action is taken.
736 * \param aca Used to obtain the fd to send the shmid to.
737 * \param fmt Usual format string.
739 __printf_2_3 void afs_error(const struct afs_callback_arg *aca,
748 n = xvasprintf(&msg, fmt, argp);
750 ret = pass_buffer_as_shm(aca->fd, SBD_ERROR_LOG, msg, n + 1);
752 PARA_ERROR_LOG("Could not send %s: %s\n", msg,
753 para_strerror(-ret));
757 static int call_callback(int fd, int query_shmid)
760 struct callback_query *cq;
762 struct afs_callback_arg aca = {.fd = fd};
764 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
768 aca.query.data = (char *)query_shm + sizeof(*cq);
769 aca.query.size = cq->query_size;
770 aca.pbout.max_size = shm_get_shmmax();
771 aca.pbout.max_size_handler = afs_max_size_handler;
772 aca.pbout.private_data = &(struct afs_max_size_handler_data) {
777 ret2 = shm_detach(query_shm);
779 if (ret < 0) /* ignore (but log) detach error */
780 PARA_ERROR_LOG("could not detach sma: %s\n",
781 para_strerror(-ret2));
785 flush_and_free_pb(&aca.pbout);
787 ret2 = pass_buffer_as_shm(fd, SBD_AFS_CB_FAILURE,
788 (const char *)&ret, sizeof(ret));
790 PARA_ERROR_LOG("could not pass cb failure packet: %s\n",
791 para_strerror(-ret));
796 static int execute_server_command(void)
800 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, &n);
802 if (ret < 0 || n == 0)
805 if (strcmp(buf, "new"))
806 return -ERRNO_TO_PARA_ERROR(EINVAL);
807 return open_next_audio_file();
810 /* returns 0 if no data available, 1 else */
811 static int execute_afs_command(int fd)
815 char buf[sizeof(cookie) + sizeof(query_shmid)];
817 int ret = read_nonblock(fd, buf, sizeof(buf), &n);
823 if (n != sizeof(buf)) {
824 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
825 ret, (long unsigned) sizeof(buf));
828 cookie = *(uint32_t *)buf;
829 if (cookie != afs_socket_cookie) {
830 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
831 (unsigned)cookie, (unsigned)afs_socket_cookie);
834 query_shmid = *(int *)(buf + sizeof(cookie));
835 if (query_shmid < 0) {
836 PARA_WARNING_LOG("received invalid query shmid %d)\n",
840 ret = call_callback(fd, query_shmid);
844 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
848 /** Shutdown connection if query has not arrived until this many seconds. */
849 #define AFS_CLIENT_TIMEOUT 3
851 static int command_post_monitor(struct sched *s, void *context)
853 struct command_task *ct = context;
854 struct sockaddr_un unix_addr;
855 struct afs_client *client, *tmp;
858 ret = task_get_notification(ct->task);
861 ret = execute_server_command();
863 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
864 task_notify_all(s, -ret);
867 /* Check the list of connected clients. */
868 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
869 ret = execute_afs_command(client->fd);
870 if (ret == 0) { /* prevent bogus connection flooding */
872 tv_diff(now, &client->connect_time, &diff);
873 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
875 PARA_WARNING_LOG("connection timeout\n");
878 list_del(&client->node);
881 /* Accept connections on the local socket. */
882 ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr), &fd);
884 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
887 ret = mark_fd_nonblocking(fd);
889 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
893 client = alloc(sizeof(*client));
895 client->connect_time = *now;
896 para_list_add(&client->node, &afs_client_list);
900 static void register_command_task(struct sched *s)
902 struct command_task *ct = &command_task_struct;
903 ct->fd = setup_command_socket_or_die();
905 ct->task = task_register(&(struct task_info) {
906 .name = "afs command",
907 .pre_monitor = command_pre_monitor,
908 .post_monitor = command_post_monitor,
913 static int afs_poll(struct pollfd *fds, nfds_t nfds, int timeout)
915 mutex_lock(mmd_mutex);
916 daemon_set_loglevel(mmd->loglevel);
917 mutex_unlock(mmd_mutex);
918 return xpoll(fds, nfds, timeout);
922 * Initialize the audio file selector process.
924 * \param socket_fd File descriptor used for communication with the server.
926 __noreturn void afs_init(int socket_fd)
928 static struct sched s;
931 register_signal_task(&s);
932 init_list_head(&afs_client_list);
933 ret = open_afs_tables();
936 server_socket = socket_fd;
937 ret = mark_fd_nonblocking(server_socket);
940 PARA_INFO_LOG("server_socket: %d\n", server_socket);
941 init_admissible_files(OPT_STRING_VAL(AFS_INITIAL_MODE));
942 register_command_task(&s);
943 s.default_timeout = 1000;
944 s.poll_function = afs_poll;
945 ret = write(socket_fd, "\0", 1);
949 ret = -ERRNO_TO_PARA_ERROR(errno);
958 signal_shutdown(signal_task);
963 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
967 static int com_select_callback(struct afs_callback_arg *aca)
969 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
973 ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
975 arg = lls_input(0, aca->lpr);
977 if (current_play_mode == PLAY_MODE_MOOD)
981 ret = activate_mood_or_playlist(arg, &aca->pbout);
984 /* ignore subsequent errors (but log them) */
985 if (current_mop && strcmp(current_mop, arg) != 0) {
987 afs_error(aca, "switching back to %s\n", current_mop);
988 ret2 = activate_mood_or_playlist(current_mop, &aca->pbout);
991 afs_error(aca, "could not reactivate %s: %s\n", current_mop,
992 para_strerror(-ret2));
994 activate_mood_or_playlist(NULL, &aca->pbout);
996 lls_free_parse_result(aca->lpr, cmd);
1000 static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
1002 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
1004 int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
1007 send_errctx(cc, errctx);
1010 ret = send_lls_callback_request(com_select_callback, cmd, lpr, cc);
1011 return ret == osl(-E_OSL_RB_KEY_NOT_FOUND)? -E_BAD_MOP : ret;
1013 EXPORT_SERVER_CMD_HANDLER(select);
1015 static int com_init_callback(struct afs_callback_arg *aca)
1017 uint32_t table_mask = *(uint32_t *)aca->query.data;
1022 for (i = 0; i < NUM_AFS_TABLES; i++) {
1023 const struct afs_table *t = afs_tables + i;
1025 if (!(table_mask & (1 << i)))
1027 if (!t->ops->create)
1029 ret = t->ops->create(database_dir);
1031 afs_error(aca, "cannot create table %s\n", t->name);
1034 para_printf(&aca->pbout, "successfully created %s table\n",
1037 ret = open_afs_tables();
1039 afs_error(aca, "cannot open afs tables: %s\n",
1040 para_strerror(-ret));
1045 static int com_init(struct command_context *cc, struct lls_parse_result *lpr)
1048 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1049 struct osl_object query = {.data = &table_mask,
1050 .size = sizeof(table_mask)};
1051 unsigned num_inputs = lls_num_inputs(lpr);
1054 ret = para_mkdir(database_dir);
1057 if (num_inputs > 0) {
1059 for (i = 0; i < num_inputs; i++) {
1060 for (j = 0; j < NUM_AFS_TABLES; j++) {
1061 const struct afs_table *t = afs_tables + j;
1063 if (strcmp(lls_input(i, lpr), t->name))
1065 table_mask |= (1 << j);
1068 if (j == NUM_AFS_TABLES)
1069 return -E_BAD_TABLE_NAME;
1072 return send_callback_request(com_init_callback, &query,
1073 afs_cb_result_handler, cc);
1075 EXPORT_SERVER_CMD_HANDLER(init);
1077 static int com_check(struct command_context *cc, struct lls_parse_result *lpr)
1079 const struct lls_opt_result *r_a = SERVER_CMD_OPT_RESULT(CHECK, AFT, lpr);
1080 const struct lls_opt_result *r_A = SERVER_CMD_OPT_RESULT(CHECK, ATTRIBUTE, lpr);
1081 const struct lls_opt_result *r_m = SERVER_CMD_OPT_RESULT(CHECK, MOOD, lpr);
1082 const struct lls_opt_result *r_p = SERVER_CMD_OPT_RESULT(CHECK, PLAYLIST, lpr);
1083 bool noopt = !lls_opt_given(r_a) && !lls_opt_given(r_A)
1084 && !lls_opt_given(r_m) && !lls_opt_given(r_p);
1087 if (noopt || lls_opt_given(r_a)) {
1088 ret = send_callback_request(aft_check_callback, NULL,
1089 afs_cb_result_handler, cc);
1093 if (noopt || lls_opt_given(r_A)) {
1094 ret = send_callback_request(attribute_check_callback, NULL,
1095 afs_cb_result_handler, cc);
1099 if (noopt || lls_opt_given(r_p)) {
1100 ret = send_callback_request(playlist_check_callback,
1101 NULL, afs_cb_result_handler, cc);
1105 if (noopt || lls_opt_given(r_m)) {
1106 ret = send_callback_request(mood_check_callback, NULL,
1107 afs_cb_result_handler, cc);
1113 EXPORT_SERVER_CMD_HANDLER(check);
1116 * The afs event dispatcher.
1118 * \param event Type of the event.
1119 * \param pb May be \p NULL.
1120 * \param data Type depends on \a event.
1122 * This function calls each table event handler, passing \a pb and \a data
1123 * verbatim. It's up to the handlers to interpret the \a data pointer. If a
1124 * handler returns negative, the loop is aborted.
1126 * \return The (negative) error code of the first handler that failed, or non-negative
1127 * if all handlers succeeded.
1129 __must_check int afs_event(enum afs_events event, struct para_buffer *pb,
1134 for (i = 0; i < NUM_AFS_TABLES; i++) {
1135 const struct afs_table *t = afs_tables + i;
1136 if (!t->ops->event_handler)
1138 ret = t->ops->event_handler(event, pb, data);
1140 PARA_CRIT_LOG("table %s, event %u: %s\n", t->name,
1141 event, para_strerror(-ret));
1149 * Dummy event handler for the images table.
1151 * \param event Unused.
1153 * \param data Unused.
1155 * \return The images table does not honor events, so this handler always
1158 __a_const int images_event_handler(__a_unused enum afs_events event,
1159 __a_unused struct para_buffer *pb, __a_unused void *data)
1165 * Dummy event handler for the lyrics table.
1167 * \param event Unused.
1169 * \param data Unused.
1171 * \return The lyrics table does not honor events, so this handler always
1174 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1175 __a_unused struct para_buffer *pb, __a_unused void *data)