2 * Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.c Paraslash's audio file selector. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
16 #include <arpa/inet.h>
21 #include "server.lsg.h"
22 #include "server_cmd.lsg.h"
40 /** The osl tables used by afs. \sa blob.c. */
42 /** Contains audio file information. See aft.c. */
44 /** The table for the paraslash attributes. See attribute.c. */
47 * Paraslash's scoring system is based on Gaussian normal
48 * distributions, and the relevant data is stored in the rbtrees of an
49 * osl table containing only volatile columns. See score.c for
54 * A standard blob table containing the mood definitions. For details
58 /** A blob table containing lyrics on a per-song basis. */
60 /** Another blob table for images (for example album cover art). */
62 /** Yet another blob table for storing standard playlists. */
64 /** How many tables are in use? */
68 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
69 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
70 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
71 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
72 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
73 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
74 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
75 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
79 /** The file descriptor for the local socket. */
82 * Value sent by the command handlers to identify themselves as
83 * children of the running para_server.
86 /** The associated task structure. */
91 extern struct misc_meta_data *mmd;
93 static int server_socket;
94 static struct command_task command_task_struct;
95 static struct signal_task *signal_task;
97 static enum play_mode current_play_mode;
98 static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
101 * A random number used to "authenticate" the connection.
103 * para_server picks this number by random before it forks the afs process. The
104 * command handlers know this number as well and write it to the afs socket,
105 * together with the id of the shared memory area which contains the payload of
106 * the afs command. A local process has to know this number to abuse the afs
107 * service provided by the local socket.
109 extern uint32_t afs_socket_cookie;
112 * Struct to let command handlers execute a callback in afs context.
114 * Commands that need to change the state of afs can't change the relevant data
115 * structures directly because commands are executed in a child process, i.e.
116 * they get their own virtual address space.
118 * This structure is used by \p send_callback_request() (executed from handler
119 * context) in order to let the afs process call the specified function. An
120 * instance of that structure is written to a shared memory area together with
121 * the arguments to the callback function. The identifier of the shared memory
122 * area is written to the command socket.
124 * The afs process accepts connections on the command socket and reads the
125 * shared memory id, attaches the corresponding area, calls the given handler to
126 * perform the desired action and to optionally compute a result.
128 * The result and a \p callback_result structure is then written to another
129 * shared memory area. The identifier for that area is written to the handler's
130 * command socket, so that the handler process can read the id, attach the
131 * shared memory area and use the result.
133 * \sa struct callback_result.
135 struct callback_query {
136 /** The function to be called. */
137 afs_callback *handler;
138 /** The number of bytes of the query */
143 * Structure embedded in the result of a callback.
145 * If the callback produced a result, an instance of that structure is embedded
146 * into the shared memory area holding the result, mainly to let the command
147 * handler know the size of the result.
149 * \sa struct callback_query.
151 struct callback_result {
152 /** The number of bytes of the result. */
154 /** The band designator (loglevel for the result). */
158 static int dispatch_result(int result_shmid, callback_result_handler *handler,
159 void *private_result_data)
161 struct osl_object result;
163 /* must attach r/w as result.data might get encrypted in-place. */
164 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
165 struct callback_result *cr = result_shm;
168 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
171 result.size = cr->result_size;
172 result.data = result_shm + sizeof(*cr);
174 ret = handler(&result, cr->band, private_result_data);
175 ret2 = shm_detach(result_shm);
177 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
185 * Ask the afs process to call a given function.
187 * \param f The function to be called.
188 * \param query Pointer to arbitrary data for the callback.
189 * \param result_handler Called for each shm area sent by the callback.
190 * \param private_result_data Passed verbatim to \a result_handler.
192 * This function creates a socket for communication with the afs process and a
193 * shared memory area (sma) to which the buffer pointed to by \a query is
194 * copied. It then notifies the afs process that the callback function \a f
195 * should be executed by sending the shared memory identifier (shmid) to the
198 * If the callback produces a result, it sends any number of shared memory
199 * identifiers back via the socket. For each such identifier received, \a
200 * result_handler is called. The contents of the sma identified by the received
201 * shmid are passed to that function as an osl object. The private_result_data
202 * pointer is passed as the second argument to \a result_handler.
204 * \return Number of shared memory areas dispatched on success, negative on
207 int send_callback_request(afs_callback *f, struct osl_object *query,
208 callback_result_handler *result_handler,
209 void *private_result_data)
211 struct callback_query *cq;
212 int ret, fd = -1, query_shmid, result_shmid;
214 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
215 size_t query_shm_size = sizeof(*cq);
216 int dispatch_error = 0, num_dispatched = 0;
219 query_shm_size += query->size;
220 ret = shm_new(query_shm_size);
224 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
229 cq->query_size = query_shm_size - sizeof(*cq);
232 memcpy(query_shm + sizeof(*cq), query->data, query->size);
233 ret = shm_detach(query_shm);
237 *(uint32_t *)buf = afs_socket_cookie;
238 *(int *)(buf + sizeof(afs_socket_cookie)) = query_shmid;
240 ret = connect_local_socket(OPT_STRING_VAL(AFS_SOCKET));
244 ret = write_all(fd, buf, sizeof(buf));
248 * Read all shmids from afs.
250 * Even if the dispatcher returns an error we _must_ continue to read
251 * shmids from fd so that we can destroy all shared memory areas that
252 * have been created for us by the afs process.
255 ret = recv_bin_buffer(fd, buf, sizeof(int));
258 assert(ret == sizeof(int));
262 ret = dispatch_result(result_shmid, result_handler,
263 private_result_data);
264 if (ret < 0 && dispatch_error >= 0)
265 dispatch_error = ret;
266 ret = shm_destroy(result_shmid);
268 PARA_CRIT_LOG("destroy result failed: %s\n",
269 para_strerror(-ret));
273 if (shm_destroy(query_shmid) < 0)
274 PARA_CRIT_LOG("shm destroy error\n");
277 if (dispatch_error < 0)
278 return dispatch_error;
281 return num_dispatched;
285 * Wrapper for send_callback_request() which passes a lopsub parse result.
287 * \param f The callback function.
288 * \param cmd Needed for (de-)serialization.
289 * \param lpr Must match cmd.
290 * \param private_result_data Passed to send_callback_request().
292 * This function serializes the parse result given by the lpr pointer into a
293 * buffer. The buffer is sent as the query to the afs process with the callback
296 * \return The return value of the underlying call to send_callback_request().
298 int send_lls_callback_request(afs_callback *f,
299 const struct lls_command * const cmd,
300 struct lls_parse_result *lpr, void *private_result_data)
302 struct osl_object query;
304 int ret = lls_serialize_parse_result(lpr, cmd, &buf, &query.size);
308 ret = send_callback_request(f, &query, afs_cb_result_handler,
309 private_result_data);
314 static int action_if_pattern_matches(struct osl_row *row, void *data)
316 struct pattern_match_data *pmd = data;
317 struct osl_object name_obj;
318 const char *p, *name;
321 ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num,
325 name = (char *)name_obj.data;
326 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
328 if (lls_num_inputs(pmd->lpr) == 0) {
329 if (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING) {
331 return pmd->action(pmd->table, row, name, pmd->data);
336 if (i >= lls_num_inputs(pmd->lpr))
338 p = lls_input(i, pmd->lpr);
339 ret = fnmatch(p, name, pmd->fnmatch_flags);
340 if (ret != FNM_NOMATCH) {
343 ret = pmd->action(pmd->table, row, name, pmd->data);
355 * Execute the given function for each matching row.
357 * \param pmd Describes what to match and how.
361 int for_each_matching_row(struct pattern_match_data *pmd)
363 if (pmd->pm_flags & PM_REVERSE_LOOP)
364 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
365 action_if_pattern_matches));
366 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
367 action_if_pattern_matches));
371 * Compare two osl objects of string type.
373 * \param obj1 Pointer to the first object.
374 * \param obj2 Pointer to the second object.
376 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
377 * are taken into account.
379 * \return It returns an integer less than, equal to, or greater than zero if
380 * \a obj1 is found, respectively, to be less than, to match, or be greater than
383 * \sa strcmp(3), strncmp(3), osl_compare_func.
385 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
387 const char *str1 = (const char *)obj1->data;
388 const char *str2 = (const char *)obj2->data;
389 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
392 static int pass_afd(int fd, char *buf, size_t size)
394 struct msghdr msg = {.msg_iov = NULL};
395 struct cmsghdr *cmsg;
396 char control[255] __a_aligned(8);
406 msg.msg_control = control;
407 msg.msg_controllen = sizeof(control);
409 cmsg = CMSG_FIRSTHDR(&msg);
410 cmsg->cmsg_level = SOL_SOCKET;
411 cmsg->cmsg_type = SCM_RIGHTS;
412 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
413 *(int *)CMSG_DATA(cmsg) = fd;
415 /* Sum of the length of all control messages in the buffer */
416 msg.msg_controllen = cmsg->cmsg_len;
417 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
418 ret = sendmsg(server_socket, &msg, 0);
420 ret = -ERRNO_TO_PARA_ERROR(errno);
427 * Pass the fd of the next audio file to the server process.
429 * This stores all information for streaming the "best" audio file in a shared
430 * memory area. The id of that area and an open file descriptor for the next
431 * audio file are passed to the server process.
435 * \sa open_and_update_audio_file().
437 static int open_next_audio_file(void)
439 struct audio_file_data afd;
443 ret = open_and_update_audio_file(&afd);
445 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
446 goto no_admissible_files;
449 if (!write_ok(server_socket)) {
453 *(uint32_t *)buf = NEXT_AUDIO_FILE;
454 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
455 ret = pass_afd(afd.fd, buf, 8);
463 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
464 *(uint32_t *)(buf + 4) = (uint32_t)0;
465 return write_all(server_socket, buf, 8);
468 /* Never fails if arg == NULL */
469 static int activate_mood_or_playlist(const char *arg, int *num_admissible)
475 ret = change_current_mood(NULL); /* always successful */
476 mode = PLAY_MODE_MOOD;
478 if (!strncmp(arg, "p/", 2)) {
479 ret = playlist_open(arg + 2);
480 mode = PLAY_MODE_PLAYLIST;
481 } else if (!strncmp(arg, "m/", 2)) {
482 ret = change_current_mood(arg + 2);
483 mode = PLAY_MODE_MOOD;
485 return -E_AFS_SYNTAX;
490 *num_admissible = ret;
491 current_play_mode = mode;
492 if (arg != current_mop) {
495 current_mop = para_strdup(arg);
496 mutex_lock(mmd_mutex);
497 strncpy(mmd->afs_mode_string, arg,
498 sizeof(mmd->afs_mode_string));
499 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
500 mutex_unlock(mmd_mutex);
502 mutex_lock(mmd_mutex);
503 strcpy(mmd->afs_mode_string, "dummy");
504 mutex_unlock(mmd_mutex);
512 * Result handler for sending data to the para_client process.
514 * \param result The data to be sent.
515 * \param band The band designator.
516 * \param private Pointer to the command context.
518 * \return The return value of the underlying call to \ref command.c::send_sb.
520 * \sa \ref callback_result_handler, \ref command.c::send_sb.
522 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
525 struct command_context *cc = private;
533 case SBD_WARNING_LOG:
537 assert(result->size > 0);
538 return send_sb(&cc->scc, result->data, result->size, band, true);
539 case SBD_AFS_CB_FAILURE:
540 return *(int *)(result->data);
546 static void flush_and_free_pb(struct para_buffer *pb)
549 struct afs_max_size_handler_data *amshd = pb->private_data;
551 if (pb->buf && pb->size > 0) {
552 ret = pass_buffer_as_shm(amshd->fd, amshd->band, pb->buf,
555 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
560 static int com_select_callback(struct afs_callback_arg *aca)
562 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
564 int num_admissible, ret;
566 ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
568 arg = lls_input(0, aca->lpr);
569 ret = clear_score_table();
571 para_printf(&aca->pbout, "could not clear score table\n");
574 if (current_play_mode == PLAY_MODE_MOOD)
575 close_current_mood();
578 ret = activate_mood_or_playlist(arg, &num_admissible);
581 /* ignore subsequent errors (but log them) */
582 para_printf(&aca->pbout, "could not activate %s\n", arg);
585 para_printf(&aca->pbout, "switching back to %s\n", current_mop);
586 ret2 = activate_mood_or_playlist(current_mop, &num_admissible);
589 para_printf(&aca->pbout, "could not reactivate %s: %s\n",
590 current_mop, para_strerror(-ret2));
592 para_printf(&aca->pbout, "activating dummy mood\n");
593 activate_mood_or_playlist(NULL, &num_admissible);
595 para_printf(&aca->pbout, "activated %s (%d admissible files)\n",
596 current_mop? current_mop : "dummy mood", num_admissible);
598 lls_free_parse_result(aca->lpr, cmd);
602 static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
604 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
606 int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
609 send_errctx(cc, errctx);
612 return send_lls_callback_request(com_select_callback, cmd, lpr, cc);
614 EXPORT_SERVER_CMD_HANDLER(select);
616 static void init_admissible_files(const char *arg)
618 if (activate_mood_or_playlist(arg, NULL) < 0)
619 activate_mood_or_playlist(NULL, NULL); /* always successful */
622 static int setup_command_socket_or_die(void)
625 const char *socket_name = OPT_STRING_VAL(AFS_SOCKET);
628 ret = create_local_socket(socket_name);
630 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
634 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
639 static void close_afs_tables(void)
642 PARA_NOTICE_LOG("closing afs_tables\n");
643 for (i = 0; i < NUM_AFS_TABLES; i++)
644 afs_tables[i].close();
647 static char *database_dir;
649 static void get_database_dir(void)
652 if (OPT_GIVEN(AFS_DATABASE_DIR))
653 database_dir = para_strdup(OPT_STRING_VAL(AFS_DATABASE_DIR));
655 char *home = para_homedir();
656 database_dir = make_message(
657 "%s/.paraslash/afs_database-0.4", home);
661 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
664 static int make_database_dir(void)
669 ret = para_mkdir(database_dir, 0777);
670 if (ret >= 0 || ret == -ERRNO_TO_PARA_ERROR(EEXIST))
675 static int open_afs_tables(void)
680 PARA_NOTICE_LOG("opening %d osl tables in %s\n", NUM_AFS_TABLES,
682 for (i = 0; i < NUM_AFS_TABLES; i++) {
683 ret = afs_tables[i].open(database_dir);
686 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
687 para_strerror(-ret));
693 afs_tables[--i].close();
697 static int afs_signal_post_select(struct sched *s, __a_unused void *context)
701 if (getppid() == 1) {
702 PARA_EMERG_LOG("para_server died\n");
705 signum = para_next_signal(&s->rfds);
708 if (signum == SIGHUP) {
710 parse_config_or_die(1);
711 ret = open_afs_tables();
714 init_admissible_files(current_mop);
717 PARA_EMERG_LOG("terminating on signal %d\n", signum);
719 task_notify_all(s, E_AFS_SIGNAL);
720 return -E_AFS_SIGNAL;
723 static void register_signal_task(struct sched *s)
725 para_sigaction(SIGPIPE, SIG_IGN);
726 signal_task = signal_init_or_die();
727 para_install_sighandler(SIGINT);
728 para_install_sighandler(SIGTERM);
729 para_install_sighandler(SIGHUP);
731 signal_task->task = task_register(&(struct task_info) {
733 .pre_select = signal_pre_select,
734 .post_select = afs_signal_post_select,
735 .context = signal_task,
740 static struct list_head afs_client_list;
742 /** Describes one connected afs client. */
744 /** Position in the afs client list. */
745 struct list_head node;
746 /** The socket file descriptor for this client. */
748 /** The time the client connected. */
749 struct timeval connect_time;
752 static void command_pre_select(struct sched *s, void *context)
754 struct command_task *ct = context;
755 struct afs_client *client;
757 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
758 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
759 list_for_each_entry(client, &afs_client_list, node)
760 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
764 * Send data as shared memory to a file descriptor.
766 * \param fd File descriptor to send the shmid to.
767 * \param band The band designator for this data.
768 * \param buf The buffer holding the data to be sent.
769 * \param size The size of \a buf.
771 * This function creates a shared memory area large enough to hold
772 * the content given by \a buf and \a size and sends the identifier
773 * of this area to the file descriptor \a fd.
775 * It is called by the AFS max_size handler as well as directly by the AFS
776 * command callbacks to send command output to the command handlers.
778 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
779 * and positive on success.
781 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
785 struct callback_result *cr;
788 assert(band != SBD_OUTPUT);
789 ret = shm_new(size + sizeof(*cr));
793 ret = shm_attach(shmid, ATTACH_RW, &shm);
797 cr->result_size = size;
800 memcpy(shm + sizeof(*cr), buf, size);
801 ret = shm_detach(shm);
804 ret = write_all(fd, (char *)&shmid, sizeof(int));
808 if (shm_destroy(shmid) < 0)
809 PARA_ERROR_LOG("destroy result failed\n");
813 static int call_callback(int fd, int query_shmid)
816 struct callback_query *cq;
818 struct afs_callback_arg aca = {.fd = fd};
820 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
824 aca.query.data = (char *)query_shm + sizeof(*cq);
825 aca.query.size = cq->query_size;
826 aca.pbout.max_size = shm_get_shmmax();
827 aca.pbout.max_size_handler = afs_max_size_handler;
828 aca.pbout.private_data = &(struct afs_max_size_handler_data) {
832 ret = cq->handler(&aca);
833 ret2 = shm_detach(query_shm);
835 if (ret < 0) /* ignore (but log) detach error */
836 PARA_ERROR_LOG("could not detach sma: %s\n",
837 para_strerror(-ret2));
841 flush_and_free_pb(&aca.pbout);
843 ret2 = pass_buffer_as_shm(fd, SBD_AFS_CB_FAILURE,
844 (const char *)&ret, sizeof(ret));
846 PARA_ERROR_LOG("could not pass cb failure packet: %s\n",
847 para_strerror(-ret));
852 static int execute_server_command(fd_set *rfds)
856 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
858 if (ret < 0 || n == 0)
861 if (strcmp(buf, "new"))
862 return -ERRNO_TO_PARA_ERROR(EINVAL);
863 return open_next_audio_file();
866 /* returns 0 if no data available, 1 else */
867 static int execute_afs_command(int fd, fd_set *rfds, uint32_t expected_cookie)
871 char buf[sizeof(cookie) + sizeof(query_shmid)];
873 int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
879 if (n != sizeof(buf)) {
880 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
881 ret, (long unsigned) sizeof(buf));
884 cookie = *(uint32_t *)buf;
885 if (cookie != expected_cookie) {
886 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
887 (unsigned)cookie, (unsigned)expected_cookie);
890 query_shmid = *(int *)(buf + sizeof(cookie));
891 if (query_shmid < 0) {
892 PARA_WARNING_LOG("received invalid query shmid %d)\n",
896 ret = call_callback(fd, query_shmid);
900 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
904 /** Shutdown connection if query has not arrived until this many seconds. */
905 #define AFS_CLIENT_TIMEOUT 3
907 static int command_post_select(struct sched *s, void *context)
909 struct command_task *ct = context;
910 struct sockaddr_un unix_addr;
911 struct afs_client *client, *tmp;
914 ret = task_get_notification(ct->task);
917 ret = execute_server_command(&s->rfds);
919 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
920 task_notify_all(s, -ret);
923 /* Check the list of connected clients. */
924 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
925 ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
926 if (ret == 0) { /* prevent bogus connection flooding */
928 tv_diff(now, &client->connect_time, &diff);
929 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
931 PARA_WARNING_LOG("connection timeout\n");
934 list_del(&client->node);
937 /* Accept connections on the local socket. */
938 ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
940 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
943 ret = mark_fd_nonblocking(fd);
945 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
949 client = para_malloc(sizeof(*client));
951 client->connect_time = *now;
952 para_list_add(&client->node, &afs_client_list);
956 static void register_command_task(uint32_t cookie, struct sched *s)
958 struct command_task *ct = &command_task_struct;
959 ct->fd = setup_command_socket_or_die();
962 ct->task = task_register(&(struct task_info) {
963 .name = "afs command",
964 .pre_select = command_pre_select,
965 .post_select = command_post_select,
971 * Initialize the audio file selector process.
973 * \param cookie The value used for "authentication".
974 * \param socket_fd File descriptor used for communication with the server.
976 __noreturn void afs_init(uint32_t cookie, int socket_fd)
978 static struct sched s;
981 register_signal_task(&s);
982 INIT_LIST_HEAD(&afs_client_list);
983 for (i = 0; i < NUM_AFS_TABLES; i++)
984 afs_tables[i].init(&afs_tables[i]);
985 ret = open_afs_tables();
988 server_socket = socket_fd;
989 ret = mark_fd_nonblocking(server_socket);
992 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
993 server_socket, (unsigned) cookie);
994 init_admissible_files(OPT_STRING_VAL(AFS_INITIAL_MODE));
995 register_command_task(cookie, &s);
996 s.default_timeout.tv_sec = 0;
997 s.default_timeout.tv_usec = 999 * 1000;
998 ret = write(socket_fd, "\0", 1);
1002 ret = -ERRNO_TO_PARA_ERROR(errno);
1011 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1015 static int com_init_callback(struct afs_callback_arg *aca)
1017 uint32_t table_mask = *(uint32_t *)aca->query.data;
1021 for (i = 0; i < NUM_AFS_TABLES; i++) {
1022 struct afs_table *t = &afs_tables[i];
1024 if (!(table_mask & (1 << i)))
1028 ret = t->create(database_dir);
1030 para_printf(&aca->pbout, "cannot create table %s\n",
1034 para_printf(&aca->pbout, "successfully created %s table\n",
1037 ret = open_afs_tables();
1039 para_printf(&aca->pbout, "cannot open afs tables\n");
1044 static int com_init(struct command_context *cc, struct lls_parse_result *lpr)
1047 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1048 struct osl_object query = {.data = &table_mask,
1049 .size = sizeof(table_mask)};
1050 unsigned num_inputs = lls_num_inputs(lpr);
1052 ret = make_database_dir();
1055 if (num_inputs > 0) {
1057 for (i = 0; i < num_inputs; i++) {
1058 for (j = 0; j < NUM_AFS_TABLES; j++) {
1059 struct afs_table *t = &afs_tables[j];
1061 if (strcmp(lls_input(i, lpr), t->name))
1063 table_mask |= (1 << j);
1066 if (j == NUM_AFS_TABLES)
1067 return -E_BAD_TABLE_NAME;
1070 return send_callback_request(com_init_callback, &query,
1071 afs_cb_result_handler, cc);
1073 EXPORT_SERVER_CMD_HANDLER(init);
1075 static int com_check(struct command_context *cc, struct lls_parse_result *lpr)
1077 const struct lls_opt_result *r_a = SERVER_CMD_OPT_RESULT(CHECK, AFT, lpr);
1078 const struct lls_opt_result *r_A = SERVER_CMD_OPT_RESULT(CHECK, ATTRIBUTE, lpr);
1079 const struct lls_opt_result *r_m = SERVER_CMD_OPT_RESULT(CHECK, MOOD, lpr);
1080 const struct lls_opt_result *r_p = SERVER_CMD_OPT_RESULT(CHECK, PLAYLIST, lpr);
1081 bool noopt = !lls_opt_given(r_a) && !lls_opt_given(r_A)
1082 && !lls_opt_given(r_m) && !lls_opt_given(r_p);
1085 if (noopt || lls_opt_given(r_a)) {
1086 ret = send_callback_request(aft_check_callback, NULL,
1087 afs_cb_result_handler, cc);
1091 if (noopt || lls_opt_given(r_A)) {
1092 ret = send_callback_request(attribute_check_callback, NULL,
1093 afs_cb_result_handler, cc);
1097 if (noopt || lls_opt_given(r_p)) {
1098 ret = send_callback_request(playlist_check_callback,
1099 NULL, afs_cb_result_handler, cc);
1103 if (noopt || lls_opt_given(r_m)) {
1104 ret = send_callback_request(mood_check_callback, NULL,
1105 afs_cb_result_handler, cc);
1111 EXPORT_SERVER_CMD_HANDLER(check);
1114 * The afs event dispatcher.
1116 * \param event Type of the event.
1117 * \param pb May be \p NULL.
1118 * \param data Type depends on \a event.
1120 * This function calls each table event handler, passing \a pb and \a data
1121 * verbatim. It's up to the handlers to interpret the \a data pointer. If a
1122 * handler returns negative, the loop is aborted.
1124 * \return The (negative) error code of the first handler that failed, or non-negative
1125 * if all handlers succeeded.
1127 __must_check int afs_event(enum afs_events event, struct para_buffer *pb,
1132 for (i = 0; i < NUM_AFS_TABLES; i++) {
1133 struct afs_table *t = &afs_tables[i];
1134 if (!t->event_handler)
1136 ret = t->event_handler(event, pb, data);
1138 PARA_CRIT_LOG("table %s, event %u: %s\n", t->name,
1139 event, para_strerror(-ret));
1147 * Dummy event handler for the images table.
1149 * \param event Unused.
1151 * \param data Unused.
1153 * \return The images table does not honor events, so this handler always
1156 __a_const int images_event_handler(__a_unused enum afs_events event,
1157 __a_unused struct para_buffer *pb, __a_unused void *data)
1163 * Dummy event handler for the lyrics table.
1165 * \param event Unused.
1167 * \param data Unused.
1169 * \return The lyrics table does not honor events, so this handler always
1172 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1173 __a_unused struct para_buffer *pb, __a_unused void *data)