+ mutex_lock(result_mutex);
+ /* No need to aquire the callback mutex again */
+ ret = shm_callback_data->sma_ret;
+ if (ret < 0) /* sma problem, callback might not have been executed */
+ goto unlock_child_mutex;
+ if (shm_callback_data->result_shmid >= 0) { /* parent provided a result */
+ void *sma;
+ ret = shm_attach(shm_callback_data->result_shmid, ATTACH_RO,
+ &sma);
+ if (ret >= 0) {
+ if (result) { /* copy result */
+ result->size = shm_callback_data->result_size;
+ result->data = para_malloc(result->size);
+ memcpy(result->data, sma, result->size);
+ ret = shm_detach(sma);
+ if (ret < 0)
+ PARA_ERROR_LOG("can not detach result\n");
+ } else
+ PARA_WARNING_LOG("no result pointer\n");
+ } else
+ PARA_ERROR_LOG("attach result failed: %d\n", ret);
+ if (shm_destroy(shm_callback_data->result_shmid) < 0)
+ PARA_ERROR_LOG("destroy result failed\n");
+ } else { /* no result from callback */
+ if (result) {
+ PARA_WARNING_LOG("callback has no result\n");
+ result->data = NULL;
+ result->size = 0;
+ }
+ }
+ ret = shm_callback_data->callback_ret;
+unlock_child_mutex:
+ /* give other children a chance */
+ mutex_unlock(child_mutex);
+out:
+ if (shm_destroy(cbd.query_shmid) < 0)
+ PARA_ERROR_LOG("%s\n", "shm destroy error");
+ PARA_DEBUG_LOG("callback_ret: %d\n", ret);
+ return ret;
+}
+
+/**
+ * Send a callback request passing an options structure and an argument vector.
+ *
+ * \param options pointer to an arbitrary data structure.
+ * \param argc Argument count.
+ * \param argv Standard argument vector.
+ * \param f The callback function.
+ * \param result The result of the query is stored here.
+ *
+ * Some commands have a couple of options that are parsed in child context for
+ * syntactic correctness and are stored in a special options structure for that
+ * command. This function allows to pass such a structure together with a list
+ * of further arguments (often a list of audio files) to the parent process.
+ *
+ * \sa send_standard_callback_request(), send_callback_request().
+ */
+int send_option_arg_callback_request(struct osl_object *options,
+ int argc, const char **argv, callback_function *f,
+ struct osl_object *result)
+{
+ char *p;
+ int i, ret;
+ struct osl_object query = {.size = options? options->size : 0};
+
+ for (i = 0; i < argc; i++)
+ query.size += strlen(argv[i]) + 1;
+ query.data = para_malloc(query.size);
+ p = query.data;
+ if (options) {
+ memcpy(query.data, options->data, options->size);
+ p += options->size;
+ }
+ for (i = 0; i < argc; i++) {
+ strcpy(p, argv[i]); /* OK */
+ p += strlen(argv[i]) + 1;
+ }
+ ret = send_callback_request(f, &query, result);
+ free(query.data);
+ return ret;
+}
+
+/**
+ * Send a callback request with an argument vector only.
+ *
+ * \param argc The same meaning as in send_option_arg_callback_request().
+ * \param argv The same meaning as in send_option_arg_callback_request().
+ * \param f The same meaning as in send_option_arg_callback_request().
+ * \param result The same meaning as in send_option_arg_callback_request().
+ *
+ * This is similar to send_option_arg_callback_request(), but no options buffer
+ * is passed to the parent process.
+ *
+ * \return The return value of the underlying call to
+ * send_option_arg_callback_request().
+ */
+int send_standard_callback_request(int argc, const char **argv,
+ callback_function *f, struct osl_object *result)
+{
+ return send_option_arg_callback_request(NULL, argc, argv, f, result);
+}
+
+/*
+ * write input from fd to dynamically allocated char array,
+ * but maximal max_size byte. Return size.
+ */
+static int fd2buf(int fd, char **buf, int max_size)
+{
+ const size_t chunk_size = 1024;
+ size_t size = 2048;
+ char *p;
+ int ret;
+
+ *buf = para_malloc(size * sizeof(char));
+ p = *buf;
+ while ((ret = read(fd, p, chunk_size)) > 0) {
+ p += ret;
+ if ((p - *buf) + chunk_size >= size) {
+ char *tmp;
+
+ size *= 2;
+ if (size > max_size) {
+ ret = -E_INPUT_TOO_LARGE;
+ goto out;
+ }
+ tmp = para_realloc(*buf, size);
+ p = (p - *buf) + tmp;
+ *buf = tmp;
+ }
+ }
+ if (ret < 0) {
+ ret = -E_READ;
+ goto out;
+ }
+ ret = p - *buf;
+out:
+ if (ret < 0 && *buf)
+ free(*buf);
+ return ret;
+}
+
+/**
+ * Read from stdin, and send the result to the parent process.
+ *
+ * \param arg_obj Pointer to the arguments to \a f.
+ * \param f The callback function.
+ * \param max_len Don't read more than that many bytes from stdin.
+ * \param result The result of the query is stored here.
+ *
+ * This function is used by commands that wish to let para_server store
+ * arbitrary data specified by the user (for instance the add_blob family of
+ * commands). First, at most \a max_len bytes are read from stdin, the result
+ * is concatenated with the buffer given by \a arg_obj, and the combined buffer
+ * is made available to the parent process via shared memory.
+ *
+ * \return Negative on errors, the return value of the underlying call to
+ * send_callback_request() otherwise.
+ */
+int stdin_command(struct osl_object *arg_obj, callback_function *f,
+ unsigned max_len, struct osl_object *result)
+{
+ char *stdin_buf;
+ size_t stdin_len;
+ struct osl_object query;
+ int ret = fd2buf(STDIN_FILENO, &stdin_buf, max_len);
+
+ if (ret < 0)
+ return ret;
+ stdin_len = ret;
+ query.size = arg_obj->size + stdin_len;
+ query.data = para_malloc(query.size);
+ memcpy(query.data, arg_obj->data, arg_obj->size);
+ memcpy((char *)query.data + arg_obj->size, stdin_buf, stdin_len);
+ free(stdin_buf);
+ ret = send_callback_request(f, &query, result);
+ free(query.data);
+ return ret;
+}
+
+/**
+ * Open the audio file with highest score.
+ *
+ * \param afd Audio file data is returned here.
+ *
+ * This stores all information for streaming the "best" audio file
+ * in the \a afd structure.
+ *
+ * \return Positive on success, negative on errors.
+ *
+ * \sa close_audio_file(), open_and_update_audio_file().
+ */
+int open_next_audio_file(struct audio_file_data *afd)
+{
+ struct osl_row *aft_row;
+ int ret;
+ for (;;) {
+ ret = score_get_best(&aft_row, &afd->score);
+ if (ret < 0)
+ return ret;
+ ret = open_and_update_audio_file(aft_row, afd);
+ if (ret >= 0)
+ return ret;
+ }
+}
+
+/**
+ * Free all resources which were allocated by open_next_audio_file().
+ *
+ * \param afd The structure previously filled in by open_next_audio_file().
+ *
+ * \return The return value of the underlying call to para_munmap().
+ *
+ * \sa open_next_audio_file().
+ */
+int close_audio_file(struct audio_file_data *afd)
+{
+ free(afd->afhi.chunk_table);
+ return para_munmap(afd->map.data, afd->map.size);
+}
+
+#if 0
+static void play_loop(enum play_mode current_play_mode)
+{
+ int i, ret;
+ struct audio_file_data afd;
+
+ afd.current_play_mode = current_play_mode;
+ for (i = 0; i < 0; i++) {
+ ret = open_next_audio_file(&afd);
+ if (ret < 0) {
+ PARA_ERROR_LOG("failed to open next audio file: %d\n", ret);
+ return;
+ }
+ PARA_NOTICE_LOG("next audio file: %s, score: %li\n", afd.path, afd.score);
+ sleep(1);
+ close_audio_file(&afd);
+ }
+}
+#endif
+
+
+static enum play_mode init_admissible_files(void)
+{
+ int ret;
+ char *given_mood, *given_playlist;
+
+ given_mood = "mood_that_was_given_at_the_command_line";
+ given_playlist = "given_playlist";
+
+ if (given_mood) {
+ ret = mood_open(given_mood);
+ if (ret >= 0) {
+ if (given_playlist)
+ PARA_WARNING_LOG("ignoring playlist %s\n",
+ given_playlist);
+ return PLAY_MODE_MOOD;
+ }
+ }
+ if (given_playlist) {
+ ret = playlist_open(given_playlist);
+ if (ret >= 0)
+ return PLAY_MODE_PLAYLIST;
+ }
+ ret = mood_open(NULL); /* open first available mood */
+ if (ret >= 0)
+ return PLAY_MODE_MOOD;
+ mood_open(""); /* open dummy mood, always successful */
+ return PLAY_MODE_MOOD;
+}
+
+static int setup_command_socket_or_die(void)
+{
+ int ret;
+ char *socket_name = "/tmp/afs_command_socket";
+ struct sockaddr_un unix_addr;
+
+ unlink(socket_name);
+ ret = create_local_socket(socket_name, &unix_addr,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
+ if (ret < 0)
+ exit(EXIT_FAILURE);
+ if (listen(ret , 5) < 0) {
+ PARA_EMERG_LOG("%s", "can not listen on socket\n");
+ exit(EXIT_FAILURE);
+ }
+ PARA_INFO_LOG("listening on command socket %s (fd %d)\n", socket_name,
+ ret);
+ return ret;
+}
+
+static int server_socket;
+
+void loop(void)
+{
+ for (;;)
+ sleep(1);
+}
+
+static void afs_shutdown(enum osl_close_flags flags)
+{
+ PARA_NOTICE_LOG("cleaning up\n");
+ score_shutdown(flags);
+ attribute_shutdown(flags);
+ mood_close();
+ playlist_close();
+ moods_shutdown(flags);
+ playlists_shutdown(flags);
+ lyrics_shutdown(flags);
+ images_shutdown(flags);
+ aft_shutdown(flags);
+}
+
+static void signal_pre_select(struct sched *s, struct task *t)
+{
+ struct signal_task *st = t->private_data;
+ t->ret = 1;
+ para_fd_set(st->fd, &s->rfds, &s->max_fileno);
+}
+
+static void signal_post_select(struct sched *s, struct task *t)
+{
+ struct signal_task *st = t->private_data;
+ t->ret = 1;
+ if (!FD_ISSET(st->fd, &s->rfds))
+ return;
+ st->signum = para_next_signal();
+ PARA_NOTICE_LOG("caught signal %d\n", st->signum);
+ t->ret = 1;
+ if (st->signum == SIGUSR1)
+ return; /* ignore SIGUSR1 */
+ afs_shutdown(OSL_MARK_CLEAN);
+ t->ret = -E_SIGNAL_CAUGHT;
+}
+
+static void register_signal_task(void)
+{
+ static struct signal_task signal_task_struct;
+ struct signal_task *st = &signal_task_struct;
+ st->fd = para_signal_init();
+ PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
+ para_install_sighandler(SIGINT);
+ para_install_sighandler(SIGTERM);
+ para_install_sighandler(SIGPIPE);
+
+ st->task.pre_select = signal_pre_select;
+ st->task.post_select = signal_post_select;
+ st->task.private_data = st;
+ sprintf(st->task.status, "signal task");
+ register_task(&st->task);
+}
+
+static void command_pre_select(struct sched *s, struct task *t)
+{
+ struct command_task *ct = t->private_data;
+ t->ret = 1;
+ para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
+}
+
+/*
+ * On errors, negative value is written to fd.
+ * On success: If query produced a result, the result_shmid is written to fd.
+ * Otherwise, zero is written.
+ */
+static int call_callback(int fd, int query_shmid)
+{
+ void *query_shm, *result_shm;
+ struct callback_query *cq;
+ struct callback_result *cr;
+ struct osl_object query, result = {.data = NULL};
+ int result_shmid = -1, ret, ret2;
+
+ ret = shm_attach(query_shmid, ATTACH_RO, &query_shm);
+ if (ret < 0)
+ goto out;
+ cq = query_shm;
+ query.data = (char *)query_shm + sizeof(*cq);
+ query.size = cq->query_size;
+ ret = cq->handler(&query, &result);
+ ret2 = shm_detach(query_shm);
+ if (ret2 < 0 && ret >= 0)
+ ret = ret2;
+ if (ret < 0)
+ goto out;
+ ret = 0;
+ if (!result.data || !result.size)
+ goto out;
+ ret = shm_new(result.size + sizeof(struct callback_result));
+ if (ret < 0)
+ goto out;
+ result_shmid = ret;
+ ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
+ if (ret < 0)
+ goto out;
+ cr = result_shm;
+ cr->result_size = result.size;
+ memcpy(result_shm + sizeof(*cr), result.data, result.size);
+ ret = shm_detach(result_shm);
+ if (ret < 0)
+ goto out;
+ ret = result_shmid;
+out:
+ free(result.data);
+ ret2 = send_bin_buffer(fd, (char *)ret, sizeof(int));
+ if (ret < 0 || ret2 < 0) {
+ if (result_shmid >= 0)
+ if (shm_destroy(result_shmid) < 0)
+ PARA_ERROR_LOG("destroy result failed\n");
+ if (ret >= 0)
+ ret = ret2;
+ }
+ return ret;
+}
+
+static void command_post_select(struct sched *s, struct task *t)
+{
+ struct command_task *ct = t->private_data;
+ struct sockaddr_un unix_addr;
+ char buf[sizeof(uint32_t) + sizeof(int)];
+ uint32_t cookie;
+ int query_shmid, fd;
+
+ t->ret = 1;
+ if (!FD_ISSET(ct->fd, &s->rfds))
+ return;
+ t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
+ if (t->ret < 0)
+ return;
+ /*
+ * The following errors may be caused by a malicious local user. So do
+ * not return an error in this case as this would terminate para_afs
+ * and para_server.
+ */
+ fd = t->ret;
+ t->ret = recv_bin_buffer(ct->fd, buf, sizeof(buf));
+ if (t->ret < 0) {
+ PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+ t->ret = 1;
+ goto out;
+ }
+ if (t->ret != sizeof(buf)) {
+ PARA_NOTICE_LOG("short read (%d bytes, expected %d)\n",
+ t->ret, sizeof(buf));
+ t->ret = 1;
+ goto out;
+ }
+ cookie = *(uint32_t *)buf;
+ if (cookie != ct->cookie) {
+ PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
+ (unsigned)cookie, (unsigned)ct->cookie);
+ t->ret = 1;
+ goto out;
+ }
+ query_shmid = *(int *)(buf + sizeof(cookie));
+ if (query_shmid < 0) {
+ PARA_WARNING_LOG("received invalid query shmid %d)\n",
+ query_shmid);
+ t->ret = 1;
+ goto out;
+ }
+ t->ret = call_callback(fd, query_shmid);
+ if (t->ret < 0) {
+ PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+ t->ret = 1;
+ goto out;
+ }
+out:
+ close(fd);
+}
+
+static void register_command_task(uint32_t cookie)
+{
+ static struct command_task command_task_struct;
+ struct command_task *ct = &command_task_struct;
+ ct->fd = setup_command_socket_or_die();
+ ct->cookie = cookie;
+
+ ct->task.pre_select = command_pre_select;
+ ct->task.post_select = command_post_select;
+ ct->task.private_data = ct;
+ sprintf(ct->task.status, "command task");
+ register_task(&ct->task);
+}
+
+void register_tasks(uint32_t cookie)
+{
+ register_signal_task();
+ register_command_task(cookie);
+}
+
+__noreturn int afs_init(uint32_t cookie, int socket_fd)
+{
+ int ret;
+// void *shm_area;
+ enum play_mode current_play_mode;
+ struct sched s;
+
+ server_socket = socket_fd;
+ PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
+ server_socket, (unsigned) cookie);
+
+ ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES]);
+ if (ret < 0)
+ goto attribute_init_error;
+ ret = moods_init(&afs_tables[TBLNUM_MOODS]);
+ if (ret < 0)
+ goto moods_init_error;
+ ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST]);
+ if (ret < 0)
+ goto playlists_init_error;
+ ret = lyrics_init(&afs_tables[TBLNUM_LYRICS]);
+ if (ret < 0)
+ goto lyrics_init_error;
+ ret = images_init(&afs_tables[TBLNUM_IMAGES]);
+ if (ret < 0)
+ goto images_init_error;
+ ret = score_init(&afs_tables[TBLNUM_SCORES]);
+ if (ret < 0)
+ goto score_init_error;
+ ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES]);
+ if (ret < 0)
+ goto aft_init_error;
+
+ current_play_mode = init_admissible_files();
+ register_tasks(cookie);
+ s.default_timeout.tv_sec = 0;
+ s.default_timeout.tv_usec = 99 * 1000;
+ sched(&s);
+
+#if 0
+ ret = shm_new(sizeof(struct callback_data));
+ if (ret < 0)
+ return ret;
+ shmid = ret;
+ ret = shm_attach(shmid, ATTACH_RW, &shm_area);
+ if (ret < 0)
+ return ret;
+ shm_callback_data = shm_area;
+ ret = mutex_new();
+ if (ret < 0)
+ return ret;
+ callback_mutex = ret;
+ ret = mutex_new();
+ if (ret < 0)
+ return ret;
+ child_mutex = ret;
+ ret = mutex_new();
+ if (ret < 0)
+ return ret;
+ result_mutex = ret;
+ mutex_lock(result_mutex);
+#endif
+aft_init_error:
+ score_shutdown(OSL_MARK_CLEAN);
+score_init_error:
+ images_shutdown(OSL_MARK_CLEAN);
+images_init_error:
+ lyrics_shutdown(OSL_MARK_CLEAN);
+lyrics_init_error:
+ playlists_shutdown(OSL_MARK_CLEAN);
+playlists_init_error:
+ moods_shutdown(OSL_MARK_CLEAN);
+moods_init_error:
+ attribute_shutdown(OSL_MARK_CLEAN);
+attribute_init_error:
+ exit(EXIT_FAILURE);
+}
+
+static int create_all_tables(void)
+{
+ int i, ret;
+
+ for (i = 0; i < NUM_AFS_TABLES; i++) {
+ struct table_info *ti = afs_tables + i;
+
+ if (ti->flags & TBLFLAG_SKIP_CREATE)