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"
36 /** The osl tables used by afs. \sa \ref blob.c. */
38 /** Contains audio file information. See \ref aft.c. */
40 /** The table for the paraslash attributes. See \ref attribute.c. */
43 * Paraslash's scoring system is based on Gaussian normal
44 * distributions, and the relevant data is stored in the rbtrees of an
45 * osl table containing only volatile columns. See \ref score.c for
50 * A standard blob table containing the mood definitions. For details
54 /** A blob table containing lyrics on a per-song basis. */
56 /** Another blob table for images (for example album cover art). */
58 /** Yet another blob table for storing standard playlists. */
60 /** How many tables are in use? */
64 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
65 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
66 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
67 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
68 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
69 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
70 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
71 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
75 /** The file descriptor for the local socket. */
78 * Value sent by the command handlers to identify themselves as
79 * children of the running para_server.
82 /** The associated task structure. */
87 extern struct misc_meta_data *mmd;
89 static int server_socket;
90 static struct command_task command_task_struct;
91 static struct signal_task *signal_task;
93 static enum play_mode current_play_mode;
94 static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
97 * A random number used to "authenticate" the connection.
99 * para_server picks this number by random before it forks the afs process. The
100 * command handlers know this number as well and write it to the afs socket,
101 * together with the id of the shared memory area which contains the payload of
102 * the afs command. A local process has to know this number to abuse the afs
103 * service provided by the local socket.
105 extern uint32_t afs_socket_cookie;
108 * Struct to let command handlers execute a callback in afs context.
110 * Commands that need to change the state of afs can't change the relevant data
111 * structures directly because commands are executed in a child process, i.e.
112 * they get their own virtual address space.
114 * This structure is used by \p send_callback_request() (executed from handler
115 * context) in order to let the afs process call the specified function. An
116 * instance of that structure is written to a shared memory area together with
117 * the arguments to the callback function. The identifier of the shared memory
118 * area is written to the command socket.
120 * The afs process accepts connections on the command socket and reads the
121 * shared memory id, attaches the corresponding area, calls the given handler to
122 * perform the desired action and to optionally compute a result.
124 * The result and a \p callback_result structure is then written to another
125 * shared memory area. The identifier for that area is written to the handler's
126 * command socket, so that the handler process can read the id, attach the
127 * shared memory area and use the result.
129 * \sa \ref struct callback_result.
131 struct callback_query {
132 /** The function to be called. */
133 afs_callback *handler;
134 /** The number of bytes of the query */
139 * Structure embedded in the result of a callback.
141 * If the callback produced a result, an instance of that structure is embedded
142 * into the shared memory area holding the result, mainly to let the command
143 * handler know the size of the result.
145 * \sa \ref struct callback_query.
147 struct callback_result {
148 /** The number of bytes of the result. */
150 /** The band designator (loglevel for the result). */
154 static int dispatch_result(int result_shmid, callback_result_handler *handler,
155 void *private_result_data)
157 struct osl_object result;
159 /* must attach r/w as result.data might get encrypted in-place. */
160 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
161 struct callback_result *cr = result_shm;
164 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
167 result.size = cr->result_size;
168 result.data = result_shm + sizeof(*cr);
170 ret = handler(&result, cr->band, private_result_data);
171 ret2 = shm_detach(result_shm);
173 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
181 * Ask the afs process to call a given function.
183 * \param f The function to be called.
184 * \param query Pointer to arbitrary data for the callback.
185 * \param result_handler Called for each shm area sent by the callback.
186 * \param private_result_data Passed verbatim to \a result_handler.
188 * This function creates a socket for communication with the afs process and a
189 * shared memory area (sma) to which the buffer pointed to by \a query is
190 * copied. It then notifies the afs process that the callback function \a f
191 * should be executed by sending the shared memory identifier (shmid) to the
194 * If the callback produces a result, it sends any number of shared memory
195 * identifiers back via the socket. For each such identifier received, \a
196 * result_handler is called. The contents of the sma identified by the received
197 * shmid are passed to that function as an osl object. The private_result_data
198 * pointer is passed as the second argument to \a result_handler.
200 * \return Number of shared memory areas dispatched on success, negative on
203 int send_callback_request(afs_callback *f, struct osl_object *query,
204 callback_result_handler *result_handler,
205 void *private_result_data)
207 struct callback_query *cq;
208 int ret, fd = -1, query_shmid, result_shmid;
210 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
211 size_t query_shm_size = sizeof(*cq);
212 int dispatch_error = 0, num_dispatched = 0;
215 query_shm_size += query->size;
216 ret = shm_new(query_shm_size);
220 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
225 cq->query_size = query_shm_size - sizeof(*cq);
228 memcpy(query_shm + sizeof(*cq), query->data, query->size);
229 ret = shm_detach(query_shm);
233 *(uint32_t *)buf = afs_socket_cookie;
234 *(int *)(buf + sizeof(afs_socket_cookie)) = query_shmid;
236 ret = connect_local_socket(OPT_STRING_VAL(AFS_SOCKET));
240 ret = write_all(fd, buf, sizeof(buf));
244 * Read all shmids from afs.
246 * Even if the dispatcher returns an error we _must_ continue to read
247 * shmids from fd so that we can destroy all shared memory areas that
248 * have been created for us by the afs process.
251 ret = recv_bin_buffer(fd, buf, sizeof(int));
254 assert(ret == sizeof(int));
258 ret = dispatch_result(result_shmid, result_handler,
259 private_result_data);
260 if (ret < 0 && dispatch_error >= 0)
261 dispatch_error = ret;
262 ret = shm_destroy(result_shmid);
264 PARA_CRIT_LOG("destroy result failed: %s\n",
265 para_strerror(-ret));
269 if (shm_destroy(query_shmid) < 0)
270 PARA_CRIT_LOG("shm destroy error\n");
273 if (dispatch_error < 0)
274 return dispatch_error;
277 return num_dispatched;
281 * Wrapper for send_callback_request() which passes a lopsub parse result.
283 * \param f The callback function.
284 * \param cmd Needed for (de-)serialization.
285 * \param lpr Must match cmd.
286 * \param private_result_data Passed to send_callback_request().
288 * This function serializes the parse result given by the lpr pointer into a
289 * buffer. The buffer is sent as the query to the afs process with the callback
292 * \return The return value of the underlying call to send_callback_request().
294 int send_lls_callback_request(afs_callback *f,
295 const struct lls_command * const cmd,
296 struct lls_parse_result *lpr, void *private_result_data)
298 struct osl_object query;
300 int ret = lls_serialize_parse_result(lpr, cmd, &buf, &query.size);
304 ret = send_callback_request(f, &query, afs_cb_result_handler,
305 private_result_data);
310 static int action_if_pattern_matches(struct osl_row *row, void *data)
312 struct pattern_match_data *pmd = data;
313 struct osl_object name_obj;
314 const char *p, *name;
317 ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num,
321 name = (char *)name_obj.data;
322 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
324 if (lls_num_inputs(pmd->lpr) == 0) {
325 if (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING) {
327 return pmd->action(pmd->table, row, name, pmd->data);
332 if (i >= lls_num_inputs(pmd->lpr))
334 p = lls_input(i, pmd->lpr);
335 ret = fnmatch(p, name, pmd->fnmatch_flags);
336 if (ret != FNM_NOMATCH) {
339 ret = pmd->action(pmd->table, row, name, pmd->data);
351 * Execute the given function for each matching row.
353 * \param pmd Describes what to match and how.
357 int for_each_matching_row(struct pattern_match_data *pmd)
359 if (pmd->pm_flags & PM_REVERSE_LOOP)
360 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
361 action_if_pattern_matches));
362 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
363 action_if_pattern_matches));
367 * Compare two osl objects of string type.
369 * \param obj1 Pointer to the first object.
370 * \param obj2 Pointer to the second object.
372 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
373 * are taken into account.
375 * \return It returns an integer less than, equal to, or greater than zero if
376 * \a obj1 is found, respectively, to be less than, to match, or be greater than
379 * \sa strcmp(3), strncmp(3).
381 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
383 const char *str1 = (const char *)obj1->data;
384 const char *str2 = (const char *)obj2->data;
385 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
388 static int pass_afd(int fd, char *buf, size_t size)
390 struct msghdr msg = {.msg_iov = NULL};
391 struct cmsghdr *cmsg;
392 char control[255] __a_aligned(8);
402 msg.msg_control = control;
403 msg.msg_controllen = sizeof(control);
405 cmsg = CMSG_FIRSTHDR(&msg);
406 cmsg->cmsg_level = SOL_SOCKET;
407 cmsg->cmsg_type = SCM_RIGHTS;
408 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
409 *(int *)CMSG_DATA(cmsg) = fd;
411 /* Sum of the length of all control messages in the buffer */
412 msg.msg_controllen = cmsg->cmsg_len;
413 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
414 ret = sendmsg(server_socket, &msg, 0);
416 ret = -ERRNO_TO_PARA_ERROR(errno);
423 * Pass the fd of the next audio file to the server process.
425 * This stores all information for streaming the "best" audio file in a shared
426 * memory area. The id of that area and an open file descriptor for the next
427 * audio file are passed to the server process.
431 * \sa \ref open_and_update_audio_file().
433 static int open_next_audio_file(void)
435 struct audio_file_data afd;
439 ret = open_and_update_audio_file(&afd);
441 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
442 goto no_admissible_files;
445 if (!write_ok(server_socket)) {
449 *(uint32_t *)buf = NEXT_AUDIO_FILE;
450 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
451 ret = pass_afd(afd.fd, buf, 8);
459 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
460 *(uint32_t *)(buf + 4) = (uint32_t)0;
461 return write_all(server_socket, buf, 8);
464 /* Never fails if arg == NULL */
465 static int activate_mood_or_playlist(const char *arg, int *num_admissible,
472 ret = change_current_mood(NULL, NULL); /* always successful */
473 mode = PLAY_MODE_MOOD;
475 if (!strncmp(arg, "p/", 2)) {
476 ret = playlist_open(arg + 2);
477 if (ret < 0 && errmsg)
478 *errmsg = make_message( "could not open %s",
480 mode = PLAY_MODE_PLAYLIST;
481 } else if (!strncmp(arg, "m/", 2)) {
482 ret = change_current_mood(arg + 2, errmsg);
483 mode = PLAY_MODE_MOOD;
486 *errmsg = make_message("%s: parse error", arg);
487 return -ERRNO_TO_PARA_ERROR(EINVAL);
493 *num_admissible = ret;
494 current_play_mode = mode;
495 if (arg != current_mop) {
498 current_mop = para_strdup(arg);
499 mutex_lock(mmd_mutex);
500 strncpy(mmd->afs_mode_string, arg,
501 sizeof(mmd->afs_mode_string));
502 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
504 mutex_unlock(mmd_mutex);
506 mutex_lock(mmd_mutex);
507 strcpy(mmd->afs_mode_string, "dummy");
509 mutex_unlock(mmd_mutex);
517 * Result handler for sending data to the para_client process.
519 * \param result The data to be sent.
520 * \param band The band designator.
521 * \param private Pointer to the command context.
523 * \return The return value of the underlying call to \ref command.c::send_sb.
525 * \sa \ref callback_result_handler, \ref command.c::send_sb.
527 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
530 struct command_context *cc = private;
538 case SBD_WARNING_LOG:
542 assert(result->size > 0);
543 return send_sb(&cc->scc, result->data, result->size, band, true);
544 case SBD_AFS_CB_FAILURE:
545 return *(int *)(result->data);
551 static void flush_and_free_pb(struct para_buffer *pb)
554 struct afs_max_size_handler_data *amshd = pb->private_data;
556 if (pb->buf && pb->size > 0) {
557 ret = pass_buffer_as_shm(amshd->fd, amshd->band, pb->buf,
560 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
565 static int com_select_callback(struct afs_callback_arg *aca)
567 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
569 int num_admissible, ret;
572 ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
574 arg = lls_input(0, aca->lpr);
575 ret = clear_score_table();
577 para_printf(&aca->pbout, "could not clear score table\n");
580 if (current_play_mode == PLAY_MODE_MOOD)
581 close_current_mood();
584 ret = activate_mood_or_playlist(arg, &num_admissible, &errmsg);
587 /* ignore subsequent errors (but log them) */
588 para_printf(&aca->pbout, "%s\n", errmsg);
590 para_printf(&aca->pbout, "could not activate %s\n", arg);
591 if (current_mop && strcmp(current_mop, arg) != 0) {
593 para_printf(&aca->pbout, "switching back to %s\n", current_mop);
594 ret2 = activate_mood_or_playlist(current_mop, &num_admissible,
598 para_printf(&aca->pbout, "%s\n", errmsg);
600 para_printf(&aca->pbout, "could not reactivate %s: %s\n",
601 current_mop, para_strerror(-ret2));
603 para_printf(&aca->pbout, "activating dummy mood\n");
604 activate_mood_or_playlist(NULL, &num_admissible, NULL);
606 para_printf(&aca->pbout, "activated %s (%d admissible files)\n",
607 current_mop? current_mop : "dummy mood", num_admissible);
609 lls_free_parse_result(aca->lpr, cmd);
613 static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
615 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
617 int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
620 send_errctx(cc, errctx);
623 return send_lls_callback_request(com_select_callback, cmd, lpr, cc);
625 EXPORT_SERVER_CMD_HANDLER(select);
627 static void init_admissible_files(const char *arg)
629 int ret = activate_mood_or_playlist(arg, NULL, NULL);
632 PARA_WARNING_LOG("could not activate %s: %s\n", arg,
633 para_strerror(-ret));
634 activate_mood_or_playlist(NULL, NULL, NULL);
638 static int setup_command_socket_or_die(void)
641 const char *socket_name = OPT_STRING_VAL(AFS_SOCKET);
644 ret = create_local_socket(socket_name);
646 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
650 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
655 static void close_afs_tables(void)
658 PARA_NOTICE_LOG("closing afs_tables\n");
659 for (i = 0; i < NUM_AFS_TABLES; i++)
660 afs_tables[i].close();
663 static char *database_dir;
665 static void get_database_dir(void)
668 if (OPT_GIVEN(AFS_DATABASE_DIR))
669 database_dir = para_strdup(OPT_STRING_VAL(AFS_DATABASE_DIR));
671 char *home = para_homedir();
672 database_dir = make_message(
673 "%s/.paraslash/afs_database-0.4", home);
677 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
680 static int make_database_dir(void)
685 ret = para_mkdir(database_dir, 0777);
686 if (ret >= 0 || ret == -ERRNO_TO_PARA_ERROR(EEXIST))
691 static int open_afs_tables(void)
696 PARA_NOTICE_LOG("opening %d osl tables in %s\n", NUM_AFS_TABLES,
698 for (i = 0; i < NUM_AFS_TABLES; i++) {
699 ret = afs_tables[i].open(database_dir);
702 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
703 para_strerror(-ret));
709 afs_tables[--i].close();
713 static int afs_signal_post_select(struct sched *s, __a_unused void *context)
717 if (getppid() == 1) {
718 PARA_EMERG_LOG("para_server died\n");
721 signum = para_next_signal(&s->rfds);
724 if (signum == SIGHUP) {
726 parse_config_or_die(1);
727 ret = open_afs_tables();
730 init_admissible_files(current_mop);
733 PARA_EMERG_LOG("terminating on signal %d\n", signum);
735 task_notify_all(s, E_AFS_SIGNAL);
736 return -E_AFS_SIGNAL;
739 static void register_signal_task(struct sched *s)
741 para_sigaction(SIGPIPE, SIG_IGN);
742 signal_task = signal_init_or_die();
743 para_install_sighandler(SIGINT);
744 para_install_sighandler(SIGTERM);
745 para_install_sighandler(SIGHUP);
747 signal_task->task = task_register(&(struct task_info) {
749 .pre_select = signal_pre_select,
750 .post_select = afs_signal_post_select,
751 .context = signal_task,
756 static struct list_head afs_client_list;
758 /** Describes one connected afs client. */
760 /** Position in the afs client list. */
761 struct list_head node;
762 /** The socket file descriptor for this client. */
764 /** The time the client connected. */
765 struct timeval connect_time;
768 static void command_pre_select(struct sched *s, void *context)
770 struct command_task *ct = context;
771 struct afs_client *client;
773 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
774 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
775 list_for_each_entry(client, &afs_client_list, node)
776 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
780 * Send data as shared memory to a file descriptor.
782 * \param fd File descriptor to send the shmid to.
783 * \param band The band designator for this data.
784 * \param buf The buffer holding the data to be sent.
785 * \param size The size of \a buf.
787 * This function creates a shared memory area large enough to hold
788 * the content given by \a buf and \a size and sends the identifier
789 * of this area to the file descriptor \a fd.
791 * It is called by the AFS max_size handler as well as directly by the AFS
792 * command callbacks to send command output to the command handlers.
794 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
795 * and positive on success.
797 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
801 struct callback_result *cr;
804 assert(band != SBD_OUTPUT);
805 ret = shm_new(size + sizeof(*cr));
809 ret = shm_attach(shmid, ATTACH_RW, &shm);
813 cr->result_size = size;
816 memcpy(shm + sizeof(*cr), buf, size);
817 ret = shm_detach(shm);
820 ret = write_all(fd, (char *)&shmid, sizeof(int));
824 if (shm_destroy(shmid) < 0)
825 PARA_ERROR_LOG("destroy result failed\n");
829 static int call_callback(int fd, int query_shmid)
832 struct callback_query *cq;
834 struct afs_callback_arg aca = {.fd = fd};
836 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
840 aca.query.data = (char *)query_shm + sizeof(*cq);
841 aca.query.size = cq->query_size;
842 aca.pbout.max_size = shm_get_shmmax();
843 aca.pbout.max_size_handler = afs_max_size_handler;
844 aca.pbout.private_data = &(struct afs_max_size_handler_data) {
848 ret = cq->handler(&aca);
849 ret2 = shm_detach(query_shm);
851 if (ret < 0) /* ignore (but log) detach error */
852 PARA_ERROR_LOG("could not detach sma: %s\n",
853 para_strerror(-ret2));
857 flush_and_free_pb(&aca.pbout);
859 ret2 = pass_buffer_as_shm(fd, SBD_AFS_CB_FAILURE,
860 (const char *)&ret, sizeof(ret));
862 PARA_ERROR_LOG("could not pass cb failure packet: %s\n",
863 para_strerror(-ret));
868 static int execute_server_command(fd_set *rfds)
872 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
874 if (ret < 0 || n == 0)
877 if (strcmp(buf, "new"))
878 return -ERRNO_TO_PARA_ERROR(EINVAL);
879 return open_next_audio_file();
882 /* returns 0 if no data available, 1 else */
883 static int execute_afs_command(int fd, fd_set *rfds, uint32_t expected_cookie)
887 char buf[sizeof(cookie) + sizeof(query_shmid)];
889 int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
895 if (n != sizeof(buf)) {
896 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
897 ret, (long unsigned) sizeof(buf));
900 cookie = *(uint32_t *)buf;
901 if (cookie != expected_cookie) {
902 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
903 (unsigned)cookie, (unsigned)expected_cookie);
906 query_shmid = *(int *)(buf + sizeof(cookie));
907 if (query_shmid < 0) {
908 PARA_WARNING_LOG("received invalid query shmid %d)\n",
912 ret = call_callback(fd, query_shmid);
916 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
920 /** Shutdown connection if query has not arrived until this many seconds. */
921 #define AFS_CLIENT_TIMEOUT 3
923 static int command_post_select(struct sched *s, void *context)
925 struct command_task *ct = context;
926 struct sockaddr_un unix_addr;
927 struct afs_client *client, *tmp;
930 ret = task_get_notification(ct->task);
933 ret = execute_server_command(&s->rfds);
935 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
936 task_notify_all(s, -ret);
939 /* Check the list of connected clients. */
940 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
941 ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
942 if (ret == 0) { /* prevent bogus connection flooding */
944 tv_diff(now, &client->connect_time, &diff);
945 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
947 PARA_WARNING_LOG("connection timeout\n");
950 list_del(&client->node);
953 /* Accept connections on the local socket. */
954 ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
956 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
959 ret = mark_fd_nonblocking(fd);
961 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
965 client = para_malloc(sizeof(*client));
967 client->connect_time = *now;
968 para_list_add(&client->node, &afs_client_list);
972 static void register_command_task(uint32_t cookie, struct sched *s)
974 struct command_task *ct = &command_task_struct;
975 ct->fd = setup_command_socket_or_die();
978 ct->task = task_register(&(struct task_info) {
979 .name = "afs command",
980 .pre_select = command_pre_select,
981 .post_select = command_post_select,
987 * Initialize the audio file selector process.
989 * \param cookie The value used for "authentication".
990 * \param socket_fd File descriptor used for communication with the server.
992 __noreturn void afs_init(uint32_t cookie, int socket_fd)
994 static struct sched s;
997 register_signal_task(&s);
998 INIT_LIST_HEAD(&afs_client_list);
999 for (i = 0; i < NUM_AFS_TABLES; i++)
1000 afs_tables[i].init(&afs_tables[i]);
1001 ret = open_afs_tables();
1004 server_socket = socket_fd;
1005 ret = mark_fd_nonblocking(server_socket);
1008 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1009 server_socket, (unsigned) cookie);
1010 init_admissible_files(OPT_STRING_VAL(AFS_INITIAL_MODE));
1011 register_command_task(cookie, &s);
1012 s.default_timeout.tv_sec = 0;
1013 s.default_timeout.tv_usec = 999 * 1000;
1014 ret = write(socket_fd, "\0", 1);
1018 ret = -ERRNO_TO_PARA_ERROR(errno);
1027 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1031 static int com_init_callback(struct afs_callback_arg *aca)
1033 uint32_t table_mask = *(uint32_t *)aca->query.data;
1037 for (i = 0; i < NUM_AFS_TABLES; i++) {
1038 struct afs_table *t = &afs_tables[i];
1040 if (!(table_mask & (1 << i)))
1044 ret = t->create(database_dir);
1046 para_printf(&aca->pbout, "cannot create table %s\n",
1050 para_printf(&aca->pbout, "successfully created %s table\n",
1053 ret = open_afs_tables();
1055 para_printf(&aca->pbout, "cannot open afs tables\n");
1060 static int com_init(struct command_context *cc, struct lls_parse_result *lpr)
1063 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1064 struct osl_object query = {.data = &table_mask,
1065 .size = sizeof(table_mask)};
1066 unsigned num_inputs = lls_num_inputs(lpr);
1068 ret = make_database_dir();
1071 if (num_inputs > 0) {
1073 for (i = 0; i < num_inputs; i++) {
1074 for (j = 0; j < NUM_AFS_TABLES; j++) {
1075 struct afs_table *t = &afs_tables[j];
1077 if (strcmp(lls_input(i, lpr), t->name))
1079 table_mask |= (1 << j);
1082 if (j == NUM_AFS_TABLES)
1083 return -E_BAD_TABLE_NAME;
1086 return send_callback_request(com_init_callback, &query,
1087 afs_cb_result_handler, cc);
1089 EXPORT_SERVER_CMD_HANDLER(init);
1091 static int com_check(struct command_context *cc, struct lls_parse_result *lpr)
1093 const struct lls_opt_result *r_a = SERVER_CMD_OPT_RESULT(CHECK, AFT, lpr);
1094 const struct lls_opt_result *r_A = SERVER_CMD_OPT_RESULT(CHECK, ATTRIBUTE, lpr);
1095 const struct lls_opt_result *r_m = SERVER_CMD_OPT_RESULT(CHECK, MOOD, lpr);
1096 const struct lls_opt_result *r_p = SERVER_CMD_OPT_RESULT(CHECK, PLAYLIST, lpr);
1097 bool noopt = !lls_opt_given(r_a) && !lls_opt_given(r_A)
1098 && !lls_opt_given(r_m) && !lls_opt_given(r_p);
1101 if (noopt || lls_opt_given(r_a)) {
1102 ret = send_callback_request(aft_check_callback, NULL,
1103 afs_cb_result_handler, cc);
1107 if (noopt || lls_opt_given(r_A)) {
1108 ret = send_callback_request(attribute_check_callback, NULL,
1109 afs_cb_result_handler, cc);
1113 if (noopt || lls_opt_given(r_p)) {
1114 ret = send_callback_request(playlist_check_callback,
1115 NULL, afs_cb_result_handler, cc);
1119 if (noopt || lls_opt_given(r_m)) {
1120 ret = send_callback_request(mood_check_callback, NULL,
1121 afs_cb_result_handler, cc);
1127 EXPORT_SERVER_CMD_HANDLER(check);
1130 * The afs event dispatcher.
1132 * \param event Type of the event.
1133 * \param pb May be \p NULL.
1134 * \param data Type depends on \a event.
1136 * This function calls each table event handler, passing \a pb and \a data
1137 * verbatim. It's up to the handlers to interpret the \a data pointer. If a
1138 * handler returns negative, the loop is aborted.
1140 * \return The (negative) error code of the first handler that failed, or non-negative
1141 * if all handlers succeeded.
1143 __must_check int afs_event(enum afs_events event, struct para_buffer *pb,
1148 for (i = 0; i < NUM_AFS_TABLES; i++) {
1149 struct afs_table *t = &afs_tables[i];
1150 if (!t->event_handler)
1152 ret = t->event_handler(event, pb, data);
1154 PARA_CRIT_LOG("table %s, event %u: %s\n", t->name,
1155 event, para_strerror(-ret));
1163 * Dummy event handler for the images table.
1165 * \param event Unused.
1167 * \param data Unused.
1169 * \return The images table does not honor events, so this handler always
1172 __a_const int images_event_handler(__a_unused enum afs_events event,
1173 __a_unused struct para_buffer *pb, __a_unused void *data)
1179 * Dummy event handler for the lyrics table.
1181 * \param event Unused.
1183 * \param data Unused.
1185 * \return The lyrics table does not honor events, so this handler always
1188 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1189 __a_unused struct para_buffer *pb, __a_unused void *data)