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 static struct afs_table afs_tables[] = {
38 {.init = aft_init, .name = "audio_files"},
39 {.init = attribute_init, .name = "attributes"},
40 {.init = score_init, .name = "scores"},
41 {.init = moods_init, .name = "moods"},
42 {.init = lyrics_init, .name = "lyrics"},
43 {.init = images_init, .name = "images"},
44 {.init = playlists_init, .name = "playlists"},
47 #define NUM_AFS_TABLES ARRAY_SIZE(afs_tables)
50 /** The file descriptor for the local socket. */
52 /** The associated task structure. */
57 extern struct misc_meta_data *mmd;
59 static int server_socket;
60 static struct command_task command_task_struct;
61 static struct signal_task *signal_task;
63 static enum play_mode current_play_mode;
64 static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
66 extern uint32_t afs_socket_cookie;
69 * Passed from command handlers to afs.
71 * Command handlers cannot change the afs database directly because they run in
72 * a separate process. The callback query structure circumvents this
73 * restriction as follows. To instruct the afs process to execute a particular
74 * function, the command hander writes an instance of this structure to a
75 * shared memory area, along with the arguments to the callback function. The
76 * identifier of the shared memory area is transferred to the afs process via
79 * The afs process reads the shared memory id from the command socket, attaches
80 * the corresponding area, and calls the callback function whose address is
83 * The command output, if any, is transferred back to the command handler in
84 * the same way: The afs process writes the output to a second shared memory
85 * area together with a fixed size metadata header whose format corresponds to
86 * the \ref callback_result structure. The identifier of this area is sent back
87 * to the command handler which attaches the area and forwards the output to
90 * \sa \ref struct callback_result.
92 struct callback_query {
93 /** The function to be called. */
94 afs_callback *handler;
95 /** The number of bytes of the query */
100 * Structure embedded in the result of a callback.
102 * If the callback produced a result, an instance of that structure is embedded
103 * into the shared memory area holding the result, mainly to let the command
104 * handler know the size of the result.
106 * \sa \ref struct callback_query.
108 struct callback_result {
109 /** The number of bytes of the result. */
111 /** The band designator (loglevel for the result). */
115 static int dispatch_result(int result_shmid, callback_result_handler *handler,
116 void *private_result_data)
118 struct osl_object result;
120 /* must attach r/w as result.data might get encrypted in-place. */
121 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
122 struct callback_result *cr = result_shm;
125 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
128 result.size = cr->result_size;
129 result.data = result_shm + sizeof(*cr);
131 ret = handler(&result, cr->band, private_result_data);
132 ret2 = shm_detach(result_shm);
134 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
142 * Ask the afs process to call a given function.
144 * \param f The function to be called.
145 * \param query Pointer to arbitrary data for the callback.
146 * \param result_handler Called for each shm area sent by the callback.
147 * \param private_result_data Passed verbatim to \a result_handler.
149 * This function creates a socket for communication with the afs process and a
150 * shared memory area (sma) to which the buffer pointed to by \a query is
151 * copied. It then notifies the afs process that the callback function \a f
152 * should be executed by sending the shared memory identifier (shmid) to the
155 * If the callback produces a result, it sends any number of shared memory
156 * identifiers back via the socket. For each such identifier received, \a
157 * result_handler is called. The contents of the sma identified by the received
158 * shmid are passed to that function as an osl object. The private_result_data
159 * pointer is passed as the second argument to \a result_handler.
161 * \return Number of shared memory areas dispatched on success, negative on
164 int send_callback_request(afs_callback *f, struct osl_object *query,
165 callback_result_handler *result_handler,
166 void *private_result_data)
168 struct callback_query *cq;
169 int ret, fd = -1, query_shmid, result_shmid;
171 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
172 size_t query_shm_size = sizeof(*cq);
173 int dispatch_error = 0, num_dispatched = 0;
176 query_shm_size += query->size;
177 ret = shm_new(query_shm_size);
181 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
186 cq->query_size = query_shm_size - sizeof(*cq);
189 memcpy(query_shm + sizeof(*cq), query->data, query->size);
190 ret = shm_detach(query_shm);
194 *(uint32_t *)buf = afs_socket_cookie;
195 *(int *)(buf + sizeof(afs_socket_cookie)) = query_shmid;
197 ret = connect_local_socket(OPT_STRING_VAL(AFS_SOCKET));
201 ret = write_all(fd, buf, sizeof(buf));
205 * Read all shmids from afs.
207 * Even if the dispatcher returns an error we _must_ continue to read
208 * shmids from fd so that we can destroy all shared memory areas that
209 * have been created for us by the afs process.
212 ret = recv_bin_buffer(fd, buf, sizeof(int));
215 assert(ret == sizeof(int));
219 ret = dispatch_result(result_shmid, result_handler,
220 private_result_data);
221 if (ret < 0 && dispatch_error >= 0)
222 dispatch_error = ret;
223 ret = shm_destroy(result_shmid);
225 PARA_CRIT_LOG("destroy result failed: %s\n",
226 para_strerror(-ret));
230 if (shm_destroy(query_shmid) < 0)
231 PARA_CRIT_LOG("shm destroy error\n");
234 if (dispatch_error < 0)
235 return dispatch_error;
238 return num_dispatched;
242 * Wrapper for send_callback_request() which passes a lopsub parse result.
244 * \param f The callback function.
245 * \param cmd Needed for (de-)serialization.
246 * \param lpr Must match cmd.
247 * \param private_result_data Passed to send_callback_request().
249 * This function serializes the parse result given by the lpr pointer into a
250 * buffer. The buffer is sent as the query to the afs process with the callback
253 * \return The return value of the underlying call to send_callback_request().
255 int send_lls_callback_request(afs_callback *f,
256 const struct lls_command * const cmd,
257 struct lls_parse_result *lpr, void *private_result_data)
259 struct osl_object query;
261 int ret = lls_serialize_parse_result(lpr, cmd, &buf, &query.size);
265 ret = send_callback_request(f, &query, afs_cb_result_handler,
266 private_result_data);
271 static int action_if_pattern_matches(struct osl_row *row, void *data)
273 struct pattern_match_data *pmd = data;
274 struct osl_object name_obj;
275 const char *p, *name;
278 ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num,
282 name = (char *)name_obj.data;
283 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
285 if (lls_num_inputs(pmd->lpr) == 0) {
286 if (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING) {
288 return pmd->action(pmd->table, row, name, pmd->data);
293 if (i >= lls_num_inputs(pmd->lpr))
295 p = lls_input(i, pmd->lpr);
296 ret = fnmatch(p, name, pmd->fnmatch_flags);
297 if (ret != FNM_NOMATCH) {
300 ret = pmd->action(pmd->table, row, name, pmd->data);
312 * Execute the given function for each matching row.
314 * \param pmd Describes what to match and how.
318 int for_each_matching_row(struct pattern_match_data *pmd)
320 if (pmd->pm_flags & PM_REVERSE_LOOP)
321 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
322 action_if_pattern_matches));
323 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
324 action_if_pattern_matches));
328 * Compare two osl objects of string type.
330 * \param obj1 Pointer to the first object.
331 * \param obj2 Pointer to the second object.
333 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
334 * are taken into account.
336 * \return It returns an integer less than, equal to, or greater than zero if
337 * \a obj1 is found, respectively, to be less than, to match, or be greater than
340 * \sa strcmp(3), strncmp(3).
342 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
344 const char *str1 = obj1->data;
345 const char *str2 = obj2->data;
346 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
349 static int pass_afd(int fd, char *buf, size_t size)
351 struct msghdr msg = {.msg_iov = NULL};
352 struct cmsghdr *cmsg;
353 char control[255] __a_aligned(8);
363 msg.msg_control = control;
364 msg.msg_controllen = sizeof(control);
366 cmsg = CMSG_FIRSTHDR(&msg);
367 cmsg->cmsg_level = SOL_SOCKET;
368 cmsg->cmsg_type = SCM_RIGHTS;
369 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
370 *(int *)CMSG_DATA(cmsg) = fd;
372 /* Sum of the length of all control messages in the buffer */
373 msg.msg_controllen = cmsg->cmsg_len;
374 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
375 ret = sendmsg(server_socket, &msg, 0);
377 ret = -ERRNO_TO_PARA_ERROR(errno);
384 * Pass the fd of the next audio file to the server process.
386 * This stores all information for streaming the "best" audio file in a shared
387 * memory area. The id of that area and an open file descriptor for the next
388 * audio file are passed to the server process.
392 * \sa \ref open_and_update_audio_file().
394 static int open_next_audio_file(void)
399 ret = open_and_update_audio_file(&fd);
401 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
402 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
403 goto no_admissible_files;
406 if (!write_ok(server_socket)) {
410 *(uint32_t *)buf = NEXT_AUDIO_FILE;
411 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
412 ret = pass_afd(fd, buf, 8);
420 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
421 *(uint32_t *)(buf + 4) = (uint32_t)0;
422 return write_all(server_socket, buf, 8);
425 static int activate_mood_or_playlist(const char *arg, int *num_admissible,
432 mode = PLAY_MODE_MOOD;
433 ret = mood_switch(NULL, errmsg);
440 if (!strncmp(arg, "p/", 2)) {
441 ret = playlist_open(arg + 2, errmsg);
442 mode = PLAY_MODE_PLAYLIST;
443 } else if (!strncmp(arg, "m/", 2)) {
444 ret = mood_switch(arg + 2, errmsg);
445 mode = PLAY_MODE_MOOD;
448 *errmsg = make_message("%s: parse error", arg);
449 return -ERRNO_TO_PARA_ERROR(EINVAL);
455 *num_admissible = ret;
456 current_play_mode = mode;
458 * We get called with arg == current_mop from the signal dispatcher
459 * after SIGHUP and from the error path of the select command to
460 * re-select the current mood or playlist. In this case the assignment
461 * to current_mop below would result in a use-after-free condition.
463 if (arg != current_mop) {
465 current_mop = arg? para_strdup(arg) : NULL;
467 /* Notify the server about the mood/playlist change. */
468 mutex_lock(mmd_mutex);
469 strncpy(mmd->afs_mode_string, arg? arg: "dummy",
470 sizeof(mmd->afs_mode_string));
471 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
473 mutex_unlock(mmd_mutex);
478 * Result handler for sending data to the para_client process.
480 * \param result The data to be sent.
481 * \param band The band designator.
482 * \param private Pointer to the command context.
484 * \return The return value of the underlying call to \ref command.c::send_sb.
486 * \sa \ref callback_result_handler, \ref command.c::send_sb.
488 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
491 struct command_context *cc = private;
499 case SBD_WARNING_LOG:
503 assert(result->size > 0);
504 return send_sb(&cc->scc, result->data, result->size, band, true);
505 case SBD_AFS_CB_FAILURE:
506 return *(int *)(result->data);
512 static void flush_and_free_pb(struct para_buffer *pb)
515 struct afs_max_size_handler_data *amshd = pb->private_data;
517 if (pb->buf && pb->size > 0) {
518 ret = pass_buffer_as_shm(amshd->fd, amshd->band, pb->buf,
521 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
526 static int com_select_callback(struct afs_callback_arg *aca)
528 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
530 int num_admissible, ret;
533 ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
535 arg = lls_input(0, aca->lpr);
536 ret = clear_score_table();
538 para_printf(&aca->pbout, "could not clear score table\n");
541 if (current_play_mode == PLAY_MODE_MOOD)
542 close_current_mood();
545 ret = activate_mood_or_playlist(arg, &num_admissible, &errmsg);
548 /* ignore subsequent errors (but log them) */
549 para_printf(&aca->pbout, "%s\n", errmsg);
551 para_printf(&aca->pbout, "could not activate %s\n", arg);
552 if (current_mop && strcmp(current_mop, arg) != 0) {
554 para_printf(&aca->pbout, "switching back to %s\n", current_mop);
555 ret2 = activate_mood_or_playlist(current_mop, &num_admissible,
559 para_printf(&aca->pbout, "%s\n", errmsg);
561 para_printf(&aca->pbout, "could not reactivate %s: %s\n",
562 current_mop, para_strerror(-ret2));
564 para_printf(&aca->pbout, "activating dummy mood\n");
565 activate_mood_or_playlist(NULL, &num_admissible, NULL);
567 para_printf(&aca->pbout, "activated %s (%d admissible file%s)\n",
568 current_mop? current_mop : "dummy mood", num_admissible,
569 num_admissible == 1? "" : "s");
571 lls_free_parse_result(aca->lpr, cmd);
575 static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
577 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
579 int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
582 send_errctx(cc, errctx);
585 return send_lls_callback_request(com_select_callback, cmd, lpr, cc);
587 EXPORT_SERVER_CMD_HANDLER(select);
589 static void init_admissible_files(const char *arg)
591 int ret = activate_mood_or_playlist(arg, NULL, NULL);
593 PARA_WARNING_LOG("could not activate %s: %s\n", arg,
594 para_strerror(-ret));
596 activate_mood_or_playlist(NULL, NULL, NULL);
600 static int setup_command_socket_or_die(void)
603 const char *socket_name = OPT_STRING_VAL(AFS_SOCKET);
606 ret = create_local_socket(socket_name);
608 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
612 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
617 static char *database_dir;
619 static void close_afs_tables(void)
622 PARA_NOTICE_LOG("closing afs tables\n");
623 for (i = 0; i < NUM_AFS_TABLES; i++)
624 afs_tables[i].close();
629 static void get_database_dir(void)
632 if (OPT_GIVEN(AFS_DATABASE_DIR))
633 database_dir = para_strdup(OPT_STRING_VAL(AFS_DATABASE_DIR));
635 char *home = para_homedir();
636 database_dir = make_message(
637 "%s/.paraslash/afs_database-0.7", home);
641 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
644 static int make_database_dir(void)
649 ret = para_mkdir(database_dir, 0777);
650 if (ret >= 0 || ret == -ERRNO_TO_PARA_ERROR(EEXIST))
655 static int open_afs_tables(void)
660 PARA_NOTICE_LOG("opening %zu osl tables in %s\n", NUM_AFS_TABLES,
662 for (i = 0; i < NUM_AFS_TABLES; i++) {
663 ret = afs_tables[i].open(database_dir);
666 PARA_ERROR_LOG("could not open %s\n", afs_tables[i].name);
672 afs_tables[--i].close();
676 static int afs_signal_post_monitor(struct sched *s, __a_unused void *context)
680 if (getppid() == 1) {
681 PARA_EMERG_LOG("para_server died\n");
684 signum = para_next_signal();
687 if (signum == SIGHUP) {
689 parse_config_or_die(1);
690 ret = open_afs_tables();
693 init_admissible_files(current_mop);
696 PARA_EMERG_LOG("terminating on signal %d\n", signum);
698 task_notify_all(s, E_AFS_SIGNAL);
699 return -E_AFS_SIGNAL;
702 static void register_signal_task(struct sched *s)
704 para_sigaction(SIGPIPE, SIG_IGN);
705 signal_task = signal_init_or_die();
706 para_install_sighandler(SIGINT);
707 para_install_sighandler(SIGTERM);
708 para_install_sighandler(SIGHUP);
710 signal_task->task = task_register(&(struct task_info) {
712 .pre_monitor = signal_pre_monitor,
713 .post_monitor = afs_signal_post_monitor,
714 .context = signal_task,
719 static struct list_head afs_client_list;
721 /** Describes one connected afs client. */
723 /** Position in the afs client list. */
724 struct list_head node;
725 /** The socket file descriptor for this client. */
727 /** The time the client connected. */
728 struct timeval connect_time;
731 static void command_pre_monitor(struct sched *s, void *context)
733 struct command_task *ct = context;
734 struct afs_client *client;
736 sched_monitor_readfd(server_socket, s);
737 sched_monitor_readfd(ct->fd, s);
738 list_for_each_entry(client, &afs_client_list, node)
739 sched_monitor_readfd(client->fd, s);
743 * Send data as shared memory to a file descriptor.
745 * \param fd File descriptor to send the shmid to.
746 * \param band The band designator for this data.
747 * \param buf The buffer holding the data to be sent.
748 * \param size The size of \a buf.
750 * This function creates a shared memory area large enough to hold
751 * the content given by \a buf and \a size and sends the identifier
752 * of this area to the file descriptor \a fd.
754 * It is called by the AFS max_size handler as well as directly by the AFS
755 * command callbacks to send command output to the command handlers.
757 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
758 * and positive on success.
760 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
764 struct callback_result *cr;
767 assert(band != SBD_OUTPUT);
768 ret = shm_new(size + sizeof(*cr));
772 ret = shm_attach(shmid, ATTACH_RW, &shm);
776 cr->result_size = size;
779 memcpy(shm + sizeof(*cr), buf, size);
780 ret = shm_detach(shm);
783 ret = write_all(fd, (char *)&shmid, sizeof(int));
787 if (shm_destroy(shmid) < 0)
788 PARA_ERROR_LOG("destroy result failed\n");
792 static int call_callback(int fd, int query_shmid)
795 struct callback_query *cq;
797 struct afs_callback_arg aca = {.fd = fd};
799 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
803 aca.query.data = (char *)query_shm + sizeof(*cq);
804 aca.query.size = cq->query_size;
805 aca.pbout.max_size = shm_get_shmmax();
806 aca.pbout.max_size_handler = afs_max_size_handler;
807 aca.pbout.private_data = &(struct afs_max_size_handler_data) {
811 ret = cq->handler(&aca);
812 ret2 = shm_detach(query_shm);
814 if (ret < 0) /* ignore (but log) detach error */
815 PARA_ERROR_LOG("could not detach sma: %s\n",
816 para_strerror(-ret2));
820 flush_and_free_pb(&aca.pbout);
822 ret2 = pass_buffer_as_shm(fd, SBD_AFS_CB_FAILURE,
823 (const char *)&ret, sizeof(ret));
825 PARA_ERROR_LOG("could not pass cb failure packet: %s\n",
826 para_strerror(-ret));
831 static int execute_server_command(void)
835 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, &n);
837 if (ret < 0 || n == 0)
840 if (strcmp(buf, "new"))
841 return -ERRNO_TO_PARA_ERROR(EINVAL);
842 return open_next_audio_file();
845 /* returns 0 if no data available, 1 else */
846 static int execute_afs_command(int fd)
850 char buf[sizeof(cookie) + sizeof(query_shmid)];
852 int ret = read_nonblock(fd, buf, sizeof(buf), &n);
858 if (n != sizeof(buf)) {
859 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
860 ret, (long unsigned) sizeof(buf));
863 cookie = *(uint32_t *)buf;
864 if (cookie != afs_socket_cookie) {
865 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
866 (unsigned)cookie, (unsigned)afs_socket_cookie);
869 query_shmid = *(int *)(buf + sizeof(cookie));
870 if (query_shmid < 0) {
871 PARA_WARNING_LOG("received invalid query shmid %d)\n",
875 ret = call_callback(fd, query_shmid);
879 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
883 /** Shutdown connection if query has not arrived until this many seconds. */
884 #define AFS_CLIENT_TIMEOUT 3
886 static int command_post_monitor(struct sched *s, void *context)
888 struct command_task *ct = context;
889 struct sockaddr_un unix_addr;
890 struct afs_client *client, *tmp;
893 ret = task_get_notification(ct->task);
896 ret = execute_server_command();
898 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
899 task_notify_all(s, -ret);
902 /* Check the list of connected clients. */
903 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
904 ret = execute_afs_command(client->fd);
905 if (ret == 0) { /* prevent bogus connection flooding */
907 tv_diff(now, &client->connect_time, &diff);
908 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
910 PARA_WARNING_LOG("connection timeout\n");
913 list_del(&client->node);
916 /* Accept connections on the local socket. */
917 ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr), &fd);
919 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
922 ret = mark_fd_nonblocking(fd);
924 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
928 client = alloc(sizeof(*client));
930 client->connect_time = *now;
931 para_list_add(&client->node, &afs_client_list);
935 static void register_command_task(struct sched *s)
937 struct command_task *ct = &command_task_struct;
938 ct->fd = setup_command_socket_or_die();
940 ct->task = task_register(&(struct task_info) {
941 .name = "afs command",
942 .pre_monitor = command_pre_monitor,
943 .post_monitor = command_post_monitor,
948 static int afs_poll(struct pollfd *fds, nfds_t nfds, int timeout)
950 mutex_lock(mmd_mutex);
951 daemon_set_loglevel(mmd->loglevel);
952 mutex_unlock(mmd_mutex);
953 return xpoll(fds, nfds, timeout);
957 * Initialize the audio file selector process.
959 * \param socket_fd File descriptor used for communication with the server.
961 __noreturn void afs_init(int socket_fd)
963 static struct sched s;
966 register_signal_task(&s);
967 init_list_head(&afs_client_list);
968 for (i = 0; i < NUM_AFS_TABLES; i++)
969 afs_tables[i].init(&afs_tables[i]);
970 ret = open_afs_tables();
973 server_socket = socket_fd;
974 ret = mark_fd_nonblocking(server_socket);
977 PARA_INFO_LOG("server_socket: %d\n", server_socket);
978 init_admissible_files(OPT_STRING_VAL(AFS_INITIAL_MODE));
979 register_command_task(&s);
980 s.default_timeout = 1000;
981 s.poll_function = afs_poll;
982 ret = write(socket_fd, "\0", 1);
986 ret = -ERRNO_TO_PARA_ERROR(errno);
991 close_current_mood();
995 signal_shutdown(signal_task);
1000 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1004 static int com_init_callback(struct afs_callback_arg *aca)
1006 uint32_t table_mask = *(uint32_t *)aca->query.data;
1011 for (i = 0; i < NUM_AFS_TABLES; i++) {
1012 struct afs_table *t = &afs_tables[i];
1014 if (!(table_mask & (1 << i)))
1018 ret = t->create(database_dir);
1020 para_printf(&aca->pbout, "cannot create table %s\n",
1024 para_printf(&aca->pbout, "successfully created %s table\n",
1027 ret = open_afs_tables();
1029 para_printf(&aca->pbout, "cannot open afs tables: %s\n",
1030 para_strerror(-ret));
1035 static int com_init(struct command_context *cc, struct lls_parse_result *lpr)
1038 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1039 struct osl_object query = {.data = &table_mask,
1040 .size = sizeof(table_mask)};
1041 unsigned num_inputs = lls_num_inputs(lpr);
1043 ret = make_database_dir();
1046 if (num_inputs > 0) {
1048 for (i = 0; i < num_inputs; i++) {
1049 for (j = 0; j < NUM_AFS_TABLES; j++) {
1050 struct afs_table *t = &afs_tables[j];
1052 if (strcmp(lls_input(i, lpr), t->name))
1054 table_mask |= (1 << j);
1057 if (j == NUM_AFS_TABLES)
1058 return -E_BAD_TABLE_NAME;
1061 return send_callback_request(com_init_callback, &query,
1062 afs_cb_result_handler, cc);
1064 EXPORT_SERVER_CMD_HANDLER(init);
1066 static int com_check(struct command_context *cc, struct lls_parse_result *lpr)
1068 const struct lls_opt_result *r_a = SERVER_CMD_OPT_RESULT(CHECK, AFT, lpr);
1069 const struct lls_opt_result *r_A = SERVER_CMD_OPT_RESULT(CHECK, ATTRIBUTE, lpr);
1070 const struct lls_opt_result *r_m = SERVER_CMD_OPT_RESULT(CHECK, MOOD, lpr);
1071 const struct lls_opt_result *r_p = SERVER_CMD_OPT_RESULT(CHECK, PLAYLIST, lpr);
1072 bool noopt = !lls_opt_given(r_a) && !lls_opt_given(r_A)
1073 && !lls_opt_given(r_m) && !lls_opt_given(r_p);
1076 if (noopt || lls_opt_given(r_a)) {
1077 ret = send_callback_request(aft_check_callback, NULL,
1078 afs_cb_result_handler, cc);
1082 if (noopt || lls_opt_given(r_A)) {
1083 ret = send_callback_request(attribute_check_callback, NULL,
1084 afs_cb_result_handler, cc);
1088 if (noopt || lls_opt_given(r_p)) {
1089 ret = send_callback_request(playlist_check_callback,
1090 NULL, afs_cb_result_handler, cc);
1094 if (noopt || lls_opt_given(r_m)) {
1095 ret = send_callback_request(mood_check_callback, NULL,
1096 afs_cb_result_handler, cc);
1102 EXPORT_SERVER_CMD_HANDLER(check);
1105 * The afs event dispatcher.
1107 * \param event Type of the event.
1108 * \param pb May be \p NULL.
1109 * \param data Type depends on \a event.
1111 * This function calls each table event handler, passing \a pb and \a data
1112 * verbatim. It's up to the handlers to interpret the \a data pointer. If a
1113 * handler returns negative, the loop is aborted.
1115 * \return The (negative) error code of the first handler that failed, or non-negative
1116 * if all handlers succeeded.
1118 __must_check int afs_event(enum afs_events event, struct para_buffer *pb,
1123 for (i = 0; i < NUM_AFS_TABLES; i++) {
1124 struct afs_table *t = &afs_tables[i];
1125 if (!t->event_handler)
1127 ret = t->event_handler(event, pb, data);
1129 PARA_CRIT_LOG("table %s, event %u: %s\n", t->name,
1130 event, para_strerror(-ret));
1138 * Dummy event handler for the images table.
1140 * \param event Unused.
1142 * \param data Unused.
1144 * \return The images table does not honor events, so this handler always
1147 __a_const int images_event_handler(__a_unused enum afs_events event,
1148 __a_unused struct para_buffer *pb, __a_unused void *data)
1154 * Dummy event handler for the lyrics table.
1156 * \param event Unused.
1158 * \param data Unused.
1160 * \return The lyrics table does not honor events, so this handler always
1163 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1164 __a_unused struct para_buffer *pb, __a_unused void *data)