Implement server side afs callbacks.
[paraslash.git] / afs.c
1 #include "para.h"
2 #include "afh.h"
3 #include "error.h"
4 #include <dirent.h> /* readdir() */
5 #include <sys/mman.h>
6 #include <sys/time.h>
7 //#include <inttypes.h>
8
9 #include "net.h"
10 #include "afs.h"
11 #include "ipc.h"
12 #include "string.h"
13 #include "list.h"
14 #include "sched.h"
15 #include "signal.h"
16 #include "fd.h"
17
18 /** \file afs.c Paraslash's audio file selector. */
19
20 /**
21 * Compare two osl objects of string type.
22 *
23 * \param obj1 Pointer to the first object.
24 * \param obj2 Pointer to the second object.
25 *
26 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
27 * are taken into account.
28 *
29 * \return It returns an integer less than, equal to, or greater than zero if
30 * \a obj1 is found, respectively, to be less than, to match, or be greater than
31 * obj2.
32 *
33 * \sa strcmp(3), strncmp(3), osl_compare_func.
34 */
35 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
36 {
37 const char *str1 = (const char *)obj1->data;
38 const char *str2 = (const char *)obj2->data;
39 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
40 }
41
42 /** The osl tables used by afs. \sa blob.c */
43 enum afs_table_num {
44 /** Contains audio file information. See aft.c. */
45 TBLNUM_AUDIO_FILES,
46 /** The table for the paraslash attributes. See attribute.c. */
47 TBLNUM_ATTRIBUTES,
48 /**
49 * Paraslash's scoring system is based on Gaussian normal
50 * distributions, and the relevant data is stored in the rbtrees of an
51 * osl table containing only volatile columns. See score.c for
52 * details.
53 */
54 TBLNUM_SCORES,
55 /**
56 * A standard blob table containing the mood definitions. For details
57 * see mood.c.
58 */
59 TBLNUM_MOODS,
60 /** A blob table containing lyrics on a per-song basis. */
61 TBLNUM_LYRICS,
62 /** Another blob table for images (for example album cover art). */
63 TBLNUM_IMAGES,
64 /** Yet another blob table for storing standard playlists. */
65 TBLNUM_PLAYLIST,
66 /** How many tables are in use? */
67 NUM_AFS_TABLES
68 };
69
70 static struct table_info afs_tables[NUM_AFS_TABLES];
71
72 struct command_task {
73 /** The file descriptor for the local socket. */
74 int fd;
75 /**
76 * Value sent by the command handlers to identify themselves as
77 * children of the running para_server.
78 */
79 uint32_t cookie;
80 /** The associated task structure. */
81 struct task task;
82 };
83
84
85 /**
86 * A wrapper for strtol(3).
87 *
88 * \param str The string to be converted to a long integer.
89 * \param result The converted value is stored here.
90 *
91 * \return Positive on success, -E_ATOL on errors.
92 *
93 * \sa strtol(3), atoi(3).
94 */
95 int para_atol(const char *str, long *result)
96 {
97 char *endptr;
98 long val;
99 int ret, base = 10;
100
101 errno = 0; /* To distinguish success/failure after call */
102 val = strtol(str, &endptr, base);
103 ret = -E_ATOL;
104 if (errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
105 goto out; /* overflow */
106 if (errno != 0 && val == 0)
107 goto out; /* other error */
108 if (endptr == str)
109 goto out; /* No digits were found */
110 if (*endptr != '\0')
111 goto out; /* Further characters after number */
112 *result = val;
113 ret = 1;
114 out:
115 return ret;
116 }
117
118 /**
119 * Struct to let para_server call a function specified from child context.
120 *
121 * Commands that need to change the state of para_server can't
122 * change the relevant data structures directly because commands
123 * are executed in a child process, i.e. they get their own
124 * virtual address space. This structure must be used to let
125 * para_server (i.e. the parent process) call a function specified
126 * by the child (the command handler).
127 *
128 * \sa fork(2), ipc.c.
129 */
130 struct callback_data {
131 /** The function to be called. */
132 callback_function *handler;
133 /** The sma for the parameters of the callback function. */
134 int query_shmid;
135 /** The size of the query sma. */
136 size_t query_size;
137 /** If the callback produced a result, it is stored in this sma. */
138 int result_shmid;
139 /** The size of the result sma. */
140 size_t result_size;
141 /** The return value of the callback function. */
142 int callback_ret;
143 /** The return value of the callback() procedure. */
144 int sma_ret;
145 };
146
147 struct callback_query {
148 /** The function to be called. */
149 callback_function *handler;
150 /** The number of bytes of the query */
151 size_t query_size;
152 };
153
154 struct callback_result {
155 /** The number of bytes of the result. */
156 size_t result_size;
157 };
158
159 static struct callback_data *shm_callback_data;
160 static int callback_mutex;
161 static int child_mutex;
162 static int result_mutex;
163
164 /**
165 * Ask the parent process to call a given function.
166 *
167 * \param f The function to be called.
168 * \param query Pointer to arbitrary data for the callback.
169 * \param result Callback result will be stored here.
170 *
171 * This function creates a shared memory area, copies the buffer pointed to by
172 * \a buf to that area and notifies the parent process that \a f should be
173 * called ASAP. It provides proper locking via semaphores to protect against
174 * concurent access to the shared memory area and against concurrent access by
175 * another child process that asks to call the same function.
176 *
177 * \return Negative, if the shared memory area could not be set up. The return
178 * value of the callback function otherwise.
179 *
180 * \sa shm_new(), shm_attach(), shm_detach(), mutex_lock(), mutex_unlock(),
181 * shm_destroy(), struct callback_data, send_option_arg_callback_request(),
182 * send_standard_callback_request().
183 */
184 int send_callback_request(callback_function *f, struct osl_object *query,
185 struct osl_object *result)
186 {
187 struct callback_data cbd = {.handler = f};
188 int ret;
189 void *query_sma;
190
191 assert(query->data && query->size);
192 ret = shm_new(query->size);
193 if (ret < 0)
194 return ret;
195 cbd.query_shmid = ret;
196 cbd.query_size = query->size;
197 ret = shm_attach(cbd.query_shmid, ATTACH_RW, &query_sma);
198 if (ret < 0)
199 goto out;
200 memcpy(query_sma, query->data, query->size);
201 ret = shm_detach(query_sma);
202 if (ret < 0)
203 goto out;
204 /* prevent other children from interacting */
205 mutex_lock(child_mutex);
206 /* prevent parent from messing with shm_callback_data. */
207 mutex_lock(callback_mutex);
208 /* all three mutexes are locked, set parameters for callback */
209 *shm_callback_data = cbd;
210 /* unblock parent */
211 mutex_unlock(callback_mutex);
212 kill(getppid(), SIGUSR1); /* wake up parent */
213 /*
214 * At this time only the parent can run. It will execute our callback
215 * and unlock the result_mutex when ready to indicate that the child
216 * may use the result. So let's sleep on this mutex.
217 */
218 mutex_lock(result_mutex);
219 /* No need to aquire the callback mutex again */
220 ret = shm_callback_data->sma_ret;
221 if (ret < 0) /* sma problem, callback might not have been executed */
222 goto unlock_child_mutex;
223 if (shm_callback_data->result_shmid >= 0) { /* parent provided a result */
224 void *sma;
225 ret = shm_attach(shm_callback_data->result_shmid, ATTACH_RO,
226 &sma);
227 if (ret >= 0) {
228 if (result) { /* copy result */
229 result->size = shm_callback_data->result_size;
230 result->data = para_malloc(result->size);
231 memcpy(result->data, sma, result->size);
232 ret = shm_detach(sma);
233 if (ret < 0)
234 PARA_ERROR_LOG("can not detach result\n");
235 } else
236 PARA_WARNING_LOG("no result pointer\n");
237 } else
238 PARA_ERROR_LOG("attach result failed: %d\n", ret);
239 if (shm_destroy(shm_callback_data->result_shmid) < 0)
240 PARA_ERROR_LOG("destroy result failed\n");
241 } else { /* no result from callback */
242 if (result) {
243 PARA_WARNING_LOG("callback has no result\n");
244 result->data = NULL;
245 result->size = 0;
246 }
247 }
248 ret = shm_callback_data->callback_ret;
249 unlock_child_mutex:
250 /* give other children a chance */
251 mutex_unlock(child_mutex);
252 out:
253 if (shm_destroy(cbd.query_shmid) < 0)
254 PARA_ERROR_LOG("%s\n", "shm destroy error");
255 PARA_DEBUG_LOG("callback_ret: %d\n", ret);
256 return ret;
257 }
258
259 /**
260 * Send a callback request passing an options structure and an argument vector.
261 *
262 * \param options pointer to an arbitrary data structure.
263 * \param argc Argument count.
264 * \param argv Standard argument vector.
265 * \param f The callback function.
266 * \param result The result of the query is stored here.
267 *
268 * Some commands have a couple of options that are parsed in child context for
269 * syntactic correctness and are stored in a special options structure for that
270 * command. This function allows to pass such a structure together with a list
271 * of further arguments (often a list of audio files) to the parent process.
272 *
273 * \sa send_standard_callback_request(), send_callback_request().
274 */
275 int send_option_arg_callback_request(struct osl_object *options,
276 int argc, const char **argv, callback_function *f,
277 struct osl_object *result)
278 {
279 char *p;
280 int i, ret;
281 struct osl_object query = {.size = options? options->size : 0};
282
283 for (i = 0; i < argc; i++)
284 query.size += strlen(argv[i]) + 1;
285 query.data = para_malloc(query.size);
286 p = query.data;
287 if (options) {
288 memcpy(query.data, options->data, options->size);
289 p += options->size;
290 }
291 for (i = 0; i < argc; i++) {
292 strcpy(p, argv[i]); /* OK */
293 p += strlen(argv[i]) + 1;
294 }
295 ret = send_callback_request(f, &query, result);
296 free(query.data);
297 return ret;
298 }
299
300 /**
301 * Send a callback request with an argument vector only.
302 *
303 * \param argc The same meaning as in send_option_arg_callback_request().
304 * \param argv The same meaning as in send_option_arg_callback_request().
305 * \param f The same meaning as in send_option_arg_callback_request().
306 * \param result The same meaning as in send_option_arg_callback_request().
307 *
308 * This is similar to send_option_arg_callback_request(), but no options buffer
309 * is passed to the parent process.
310 *
311 * \return The return value of the underlying call to
312 * send_option_arg_callback_request().
313 */
314 int send_standard_callback_request(int argc, const char **argv,
315 callback_function *f, struct osl_object *result)
316 {
317 return send_option_arg_callback_request(NULL, argc, argv, f, result);
318 }
319
320 /*
321 * write input from fd to dynamically allocated char array,
322 * but maximal max_size byte. Return size.
323 */
324 static int fd2buf(int fd, char **buf, int max_size)
325 {
326 const size_t chunk_size = 1024;
327 size_t size = 2048;
328 char *p;
329 int ret;
330
331 *buf = para_malloc(size * sizeof(char));
332 p = *buf;
333 while ((ret = read(fd, p, chunk_size)) > 0) {
334 p += ret;
335 if ((p - *buf) + chunk_size >= size) {
336 char *tmp;
337
338 size *= 2;
339 if (size > max_size) {
340 ret = -E_INPUT_TOO_LARGE;
341 goto out;
342 }
343 tmp = para_realloc(*buf, size);
344 p = (p - *buf) + tmp;
345 *buf = tmp;
346 }
347 }
348 if (ret < 0) {
349 ret = -E_READ;
350 goto out;
351 }
352 ret = p - *buf;
353 out:
354 if (ret < 0 && *buf)
355 free(*buf);
356 return ret;
357 }
358
359 /**
360 * Read from stdin, and send the result to the parent process.
361 *
362 * \param arg_obj Pointer to the arguments to \a f.
363 * \param f The callback function.
364 * \param max_len Don't read more than that many bytes from stdin.
365 * \param result The result of the query is stored here.
366 *
367 * This function is used by commands that wish to let para_server store
368 * arbitrary data specified by the user (for instance the add_blob family of
369 * commands). First, at most \a max_len bytes are read from stdin, the result
370 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
371 * is made available to the parent process via shared memory.
372 *
373 * \return Negative on errors, the return value of the underlying call to
374 * send_callback_request() otherwise.
375 */
376 int stdin_command(struct osl_object *arg_obj, callback_function *f,
377 unsigned max_len, struct osl_object *result)
378 {
379 char *stdin_buf;
380 size_t stdin_len;
381 struct osl_object query;
382 int ret = fd2buf(STDIN_FILENO, &stdin_buf, max_len);
383
384 if (ret < 0)
385 return ret;
386 stdin_len = ret;
387 query.size = arg_obj->size + stdin_len;
388 query.data = para_malloc(query.size);
389 memcpy(query.data, arg_obj->data, arg_obj->size);
390 memcpy((char *)query.data + arg_obj->size, stdin_buf, stdin_len);
391 free(stdin_buf);
392 ret = send_callback_request(f, &query, result);
393 free(query.data);
394 return ret;
395 }
396
397 /**
398 * Open the audio file with highest score.
399 *
400 * \param afd Audio file data is returned here.
401 *
402 * This stores all information for streaming the "best" audio file
403 * in the \a afd structure.
404 *
405 * \return Positive on success, negative on errors.
406 *
407 * \sa close_audio_file(), open_and_update_audio_file().
408 */
409 int open_next_audio_file(struct audio_file_data *afd)
410 {
411 struct osl_row *aft_row;
412 int ret;
413 for (;;) {
414 ret = score_get_best(&aft_row, &afd->score);
415 if (ret < 0)
416 return ret;
417 ret = open_and_update_audio_file(aft_row, afd);
418 if (ret >= 0)
419 return ret;
420 }
421 }
422
423 /**
424 * Free all resources which were allocated by open_next_audio_file().
425 *
426 * \param afd The structure previously filled in by open_next_audio_file().
427 *
428 * \return The return value of the underlying call to para_munmap().
429 *
430 * \sa open_next_audio_file().
431 */
432 int close_audio_file(struct audio_file_data *afd)
433 {
434 free(afd->afhi.chunk_table);
435 return para_munmap(afd->map.data, afd->map.size);
436 }
437
438 #if 0
439 static void play_loop(enum play_mode current_play_mode)
440 {
441 int i, ret;
442 struct audio_file_data afd;
443
444 afd.current_play_mode = current_play_mode;
445 for (i = 0; i < 0; i++) {
446 ret = open_next_audio_file(&afd);
447 if (ret < 0) {
448 PARA_ERROR_LOG("failed to open next audio file: %d\n", ret);
449 return;
450 }
451 PARA_NOTICE_LOG("next audio file: %s, score: %li\n", afd.path, afd.score);
452 sleep(1);
453 close_audio_file(&afd);
454 }
455 }
456 #endif
457
458
459 static enum play_mode init_admissible_files(void)
460 {
461 int ret;
462 char *given_mood, *given_playlist;
463
464 given_mood = "mood_that_was_given_at_the_command_line";
465 given_playlist = "given_playlist";
466
467 if (given_mood) {
468 ret = mood_open(given_mood);
469 if (ret >= 0) {
470 if (given_playlist)
471 PARA_WARNING_LOG("ignoring playlist %s\n",
472 given_playlist);
473 return PLAY_MODE_MOOD;
474 }
475 }
476 if (given_playlist) {
477 ret = playlist_open(given_playlist);
478 if (ret >= 0)
479 return PLAY_MODE_PLAYLIST;
480 }
481 ret = mood_open(NULL); /* open first available mood */
482 if (ret >= 0)
483 return PLAY_MODE_MOOD;
484 mood_open(""); /* open dummy mood, always successful */
485 return PLAY_MODE_MOOD;
486 }
487
488 static int setup_command_socket_or_die(void)
489 {
490 int ret;
491 char *socket_name = "/tmp/afs_command_socket";
492 struct sockaddr_un unix_addr;
493
494 unlink(socket_name);
495 ret = create_local_socket(socket_name, &unix_addr,
496 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
497 if (ret < 0)
498 exit(EXIT_FAILURE);
499 if (listen(ret , 5) < 0) {
500 PARA_EMERG_LOG("%s", "can not listen on socket\n");
501 exit(EXIT_FAILURE);
502 }
503 PARA_INFO_LOG("listening on command socket %s (fd %d)\n", socket_name,
504 ret);
505 return ret;
506 }
507
508 static int server_socket;
509
510 void loop(void)
511 {
512 for (;;)
513 sleep(1);
514 }
515
516 static void afs_shutdown(enum osl_close_flags flags)
517 {
518 PARA_NOTICE_LOG("cleaning up\n");
519 score_shutdown(flags);
520 attribute_shutdown(flags);
521 mood_close();
522 playlist_close();
523 moods_shutdown(flags);
524 playlists_shutdown(flags);
525 lyrics_shutdown(flags);
526 images_shutdown(flags);
527 aft_shutdown(flags);
528 }
529
530 static void signal_pre_select(struct sched *s, struct task *t)
531 {
532 struct signal_task *st = t->private_data;
533 t->ret = 1;
534 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
535 }
536
537 static void signal_post_select(struct sched *s, struct task *t)
538 {
539 struct signal_task *st = t->private_data;
540 t->ret = 1;
541 if (!FD_ISSET(st->fd, &s->rfds))
542 return;
543 st->signum = para_next_signal();
544 PARA_NOTICE_LOG("caught signal %d\n", st->signum);
545 t->ret = 1;
546 if (st->signum == SIGUSR1)
547 return; /* ignore SIGUSR1 */
548 afs_shutdown(OSL_MARK_CLEAN);
549 t->ret = -E_SIGNAL_CAUGHT;
550 }
551
552 static void register_signal_task(void)
553 {
554 static struct signal_task signal_task_struct;
555 struct signal_task *st = &signal_task_struct;
556 st->fd = para_signal_init();
557 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
558 para_install_sighandler(SIGINT);
559 para_install_sighandler(SIGTERM);
560 para_install_sighandler(SIGPIPE);
561
562 st->task.pre_select = signal_pre_select;
563 st->task.post_select = signal_post_select;
564 st->task.private_data = st;
565 sprintf(st->task.status, "signal task");
566 register_task(&st->task);
567 }
568
569 static void command_pre_select(struct sched *s, struct task *t)
570 {
571 struct command_task *ct = t->private_data;
572 t->ret = 1;
573 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
574 }
575
576 /*
577 * On errors, negative value is written to fd.
578 * On success: If query produced a result, the result_shmid is written to fd.
579 * Otherwise, zero is written.
580 */
581 static int call_callback(int fd, int query_shmid)
582 {
583 void *query_shm, *result_shm;
584 struct callback_query *cq;
585 struct callback_result *cr;
586 struct osl_object query, result = {.data = NULL};
587 int result_shmid = -1, ret, ret2;
588
589 ret = shm_attach(query_shmid, ATTACH_RO, &query_shm);
590 if (ret < 0)
591 goto out;
592 cq = query_shm;
593 query.data = (char *)query_shm + sizeof(*cq);
594 query.size = cq->query_size;
595 ret = cq->handler(&query, &result);
596 ret2 = shm_detach(query_shm);
597 if (ret2 < 0 && ret >= 0)
598 ret = ret2;
599 if (ret < 0)
600 goto out;
601 ret = 0;
602 if (!result.data || !result.size)
603 goto out;
604 ret = shm_new(result.size + sizeof(struct callback_result));
605 if (ret < 0)
606 goto out;
607 result_shmid = ret;
608 ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
609 if (ret < 0)
610 goto out;
611 cr = result_shm;
612 cr->result_size = result.size;
613 memcpy(result_shm + sizeof(*cr), result.data, result.size);
614 ret = shm_detach(result_shm);
615 if (ret < 0)
616 goto out;
617 ret = result_shmid;
618 out:
619 free(result.data);
620 ret2 = send_bin_buffer(fd, (char *)ret, sizeof(int));
621 if (ret < 0 || ret2 < 0) {
622 if (result_shmid >= 0)
623 if (shm_destroy(result_shmid) < 0)
624 PARA_ERROR_LOG("destroy result failed\n");
625 if (ret >= 0)
626 ret = ret2;
627 }
628 return ret;
629 }
630
631 static void command_post_select(struct sched *s, struct task *t)
632 {
633 struct command_task *ct = t->private_data;
634 struct sockaddr_un unix_addr;
635 char buf[sizeof(uint32_t) + sizeof(int)];
636 uint32_t cookie;
637 int query_shmid, fd;
638
639 t->ret = 1;
640 if (!FD_ISSET(ct->fd, &s->rfds))
641 return;
642 t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
643 if (t->ret < 0)
644 return;
645 /*
646 * The following errors may be caused by a malicious local user. So do
647 * not return an error in this case as this would terminate para_afs
648 * and para_server.
649 */
650 fd = t->ret;
651 t->ret = recv_bin_buffer(ct->fd, buf, sizeof(buf));
652 if (t->ret < 0) {
653 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
654 t->ret = 1;
655 goto out;
656 }
657 if (t->ret != sizeof(buf)) {
658 PARA_NOTICE_LOG("short read (%d bytes, expected %d)\n",
659 t->ret, sizeof(buf));
660 t->ret = 1;
661 goto out;
662 }
663 cookie = *(uint32_t *)buf;
664 if (cookie != ct->cookie) {
665 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
666 (unsigned)cookie, (unsigned)ct->cookie);
667 t->ret = 1;
668 goto out;
669 }
670 query_shmid = *(int *)(buf + sizeof(cookie));
671 if (query_shmid < 0) {
672 PARA_WARNING_LOG("received invalid query shmid %d)\n",
673 query_shmid);
674 t->ret = 1;
675 goto out;
676 }
677 t->ret = call_callback(fd, query_shmid);
678 if (t->ret < 0) {
679 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
680 t->ret = 1;
681 goto out;
682 }
683 out:
684 close(fd);
685 }
686
687 static void register_command_task(uint32_t cookie)
688 {
689 static struct command_task command_task_struct;
690 struct command_task *ct = &command_task_struct;
691 ct->fd = setup_command_socket_or_die();
692 ct->cookie = cookie;
693
694 ct->task.pre_select = command_pre_select;
695 ct->task.post_select = command_post_select;
696 ct->task.private_data = ct;
697 sprintf(ct->task.status, "command task");
698 register_task(&ct->task);
699 }
700
701 void register_tasks(uint32_t cookie)
702 {
703 register_signal_task();
704 register_command_task(cookie);
705 }
706
707 __noreturn int afs_init(uint32_t cookie, int socket_fd)
708 {
709 int ret;
710 // void *shm_area;
711 enum play_mode current_play_mode;
712 struct sched s;
713
714 server_socket = socket_fd;
715 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
716 server_socket, (unsigned) cookie);
717
718 ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES]);
719 if (ret < 0)
720 goto attribute_init_error;
721 ret = moods_init(&afs_tables[TBLNUM_MOODS]);
722 if (ret < 0)
723 goto moods_init_error;
724 ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST]);
725 if (ret < 0)
726 goto playlists_init_error;
727 ret = lyrics_init(&afs_tables[TBLNUM_LYRICS]);
728 if (ret < 0)
729 goto lyrics_init_error;
730 ret = images_init(&afs_tables[TBLNUM_IMAGES]);
731 if (ret < 0)
732 goto images_init_error;
733 ret = score_init(&afs_tables[TBLNUM_SCORES]);
734 if (ret < 0)
735 goto score_init_error;
736 ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES]);
737 if (ret < 0)
738 goto aft_init_error;
739
740 current_play_mode = init_admissible_files();
741 register_tasks(cookie);
742 s.default_timeout.tv_sec = 0;
743 s.default_timeout.tv_usec = 99 * 1000;
744 sched(&s);
745
746 #if 0
747 ret = shm_new(sizeof(struct callback_data));
748 if (ret < 0)
749 return ret;
750 shmid = ret;
751 ret = shm_attach(shmid, ATTACH_RW, &shm_area);
752 if (ret < 0)
753 return ret;
754 shm_callback_data = shm_area;
755 ret = mutex_new();
756 if (ret < 0)
757 return ret;
758 callback_mutex = ret;
759 ret = mutex_new();
760 if (ret < 0)
761 return ret;
762 child_mutex = ret;
763 ret = mutex_new();
764 if (ret < 0)
765 return ret;
766 result_mutex = ret;
767 mutex_lock(result_mutex);
768 #endif
769 aft_init_error:
770 score_shutdown(OSL_MARK_CLEAN);
771 score_init_error:
772 images_shutdown(OSL_MARK_CLEAN);
773 images_init_error:
774 lyrics_shutdown(OSL_MARK_CLEAN);
775 lyrics_init_error:
776 playlists_shutdown(OSL_MARK_CLEAN);
777 playlists_init_error:
778 moods_shutdown(OSL_MARK_CLEAN);
779 moods_init_error:
780 attribute_shutdown(OSL_MARK_CLEAN);
781 attribute_init_error:
782 exit(EXIT_FAILURE);
783 }
784
785 static int create_all_tables(void)
786 {
787 int i, ret;
788
789 for (i = 0; i < NUM_AFS_TABLES; i++) {
790 struct table_info *ti = afs_tables + i;
791
792 if (ti->flags & TBLFLAG_SKIP_CREATE)
793 continue;
794 ret = osl_create_table(ti->desc);
795 if (ret < 0)
796 return ret;
797 }
798 return 1;
799 }
800
801 /* TODO load tables after init */
802 static int com_init(__a_unused int fd, int argc, const char **argv)
803 {
804 int i, j, ret;
805 if (argc == 1)
806 return create_all_tables();
807 for (i = 1; i < argc; i++) {
808 for (j = 0; j < NUM_AFS_TABLES; j++) {
809 struct table_info *ti = afs_tables + j;
810
811 if (ti->flags & TBLFLAG_SKIP_CREATE)
812 continue;
813 if (strcmp(argv[i], ti->desc->name))
814 continue;
815 PARA_NOTICE_LOG("creating table %s\n", argv[i]);
816 ret = osl_create_table(ti->desc);
817 if (ret < 0)
818 return ret;
819 break;
820 }
821 if (j == NUM_AFS_TABLES)
822 return -E_BAD_TABLE_NAME;
823 }
824 return 1;
825 }
826
827 /** Describes a command of para_server. */
828 struct command {
829 /** The name of the command. */
830 const char *name;
831 /** The handler function. */
832 int (*handler)(int fd, int argc, const char **argv);
833 };
834
835 static struct command afs_cmds[] = {
836 {
837 .name = "add",
838 .handler = com_add,
839 },
840 {
841 .name = "addlyr",
842 .handler = com_addlyr,
843 },
844 {
845 .name = "addimg",
846 .handler = com_addimg,
847 },
848 {
849 .name = "addmood",
850 .handler = com_addmood,
851 },
852 {
853 .name = "addpl",
854 .handler = com_addpl,
855 },
856 {
857 .name = "catlyr",
858 .handler = com_catlyr,
859 },
860 {
861 .name = "catimg",
862 .handler = com_catimg,
863 },
864 {
865 .name = "mvimg",
866 .handler = com_mvimg,
867 },
868 {
869 .name = "mvlyr",
870 .handler = com_mvlyr,
871 },
872 {
873 .name = "mvmood",
874 .handler = com_mvmood,
875 },
876 {
877 .name = "mvpl",
878 .handler = com_mvpl,
879 },
880 {
881 .name = "catmood",
882 .handler = com_catmood,
883 },
884 {
885 .name = "catpl",
886 .handler = com_catpl,
887 },
888 {
889 .name = "rmatt",
890 .handler = com_rmatt,
891 },
892 {
893 .name = "init",
894 .handler = com_init,
895 },
896 {
897 .name = "lsatt",
898 .handler = com_lsatt,
899 },
900 {
901 .name = "ls",
902 .handler = com_afs_ls,
903 },
904 {
905 .name = "lslyr",
906 .handler = com_lslyr,
907 },
908 {
909 .name = "lsimg",
910 .handler = com_lsimg,
911 },
912 {
913 .name = "lsmood",
914 .handler = com_lsmood,
915 },
916 {
917 .name = "lspl",
918 .handler = com_lspl,
919 },
920 {
921 .name = "setatt",
922 .handler = com_setatt,
923 },
924 {
925 .name = "addatt",
926 .handler = com_addatt,
927 },
928 {
929 .name = "rm",
930 .handler = com_afs_rm,
931 },
932 {
933 .name = "rmlyr",
934 .handler = com_rmlyr,
935 },
936 {
937 .name = "rmimg",
938 .handler = com_rmimg,
939 },
940 {
941 .name = "rmmood",
942 .handler = com_rmmood,
943 },
944 {
945 .name = "rmpl",
946 .handler = com_rmpl,
947 },
948 {
949 .name = "touch",
950 .handler = com_touch,
951 },
952 {
953 .name = NULL,
954 }
955 };
956
957 #if 0
958 static void call_callback(void)
959 {
960 struct osl_object query, result = {.data = NULL};
961 int ret, ret2;
962
963 shm_callback_data->result_shmid = -1; /* no result */
964 ret = shm_attach(shm_callback_data->query_shmid, ATTACH_RW,
965 &query.data);
966 if (ret < 0)
967 goto out;
968 query.size = shm_callback_data->query_size;
969 shm_callback_data->callback_ret = shm_callback_data->handler(&query,
970 &result);
971 if (result.data && result.size) {
972 void *sma;
973 ret = shm_new(result.size);
974 if (ret < 0)
975 goto detach_query;
976 shm_callback_data->result_shmid = ret;
977 shm_callback_data->result_size = result.size;
978 ret = shm_attach(shm_callback_data->result_shmid, ATTACH_RW, &sma);
979 if (ret < 0)
980 goto destroy_result;
981 memcpy(sma, result.data, result.size);
982 ret = shm_detach(sma);
983 if (ret < 0) {
984 PARA_ERROR_LOG("detach result failed\n");
985 goto destroy_result;
986 }
987 }
988 ret = 1;
989 goto detach_query;
990 destroy_result:
991 if (shm_destroy(shm_callback_data->result_shmid) < 0)
992 PARA_ERROR_LOG("destroy result failed\n");
993 shm_callback_data->result_shmid = -1;
994 detach_query:
995 free(result.data);
996 ret2 = shm_detach(query.data);
997 if (ret2 < 0) {
998 PARA_ERROR_LOG("detach query failed\n");
999 if (ret >= 0)
1000 ret = ret2;
1001 }
1002 out:
1003 if (ret < 0)
1004 PARA_ERROR_LOG("sma error %d\n", ret);
1005 shm_callback_data->sma_ret = ret;
1006 shm_callback_data->handler = NULL;
1007 mutex_unlock(result_mutex); /* wake up child */
1008 }
1009
1010 static int got_sigchld;
1011 static void server_loop(int child_pid)
1012 {
1013 // int status;
1014
1015 PARA_DEBUG_LOG("server pid: %d, child pid: %d\n",
1016 getpid(), child_pid);
1017 for (;;) {
1018 mutex_lock(callback_mutex);
1019 if (shm_callback_data->handler)
1020 call_callback();
1021 mutex_unlock(callback_mutex);
1022 usleep(100);
1023 if (!got_sigchld)
1024 continue;
1025 mutex_destroy(result_mutex);
1026 mutex_destroy(callback_mutex);
1027 mutex_destroy(child_mutex);
1028 afs_shutdown(OSL_MARK_CLEAN);
1029 exit(EXIT_SUCCESS);
1030 }
1031 }
1032
1033 int main(int argc, const char **argv)
1034 {
1035 int i, ret = -E_AFS_SYNTAX;
1036
1037 signal(SIGUSR1, dummy);
1038 signal(SIGCHLD, sigchld_handler);
1039 if (argc < 2)
1040 goto out;
1041 ret = setup();
1042 // ret = afs_init();
1043 if (ret < 0) {
1044 PARA_EMERG_LOG("afs_init returned %d\n", ret);
1045 exit(EXIT_FAILURE);
1046 }
1047 ret = fork();
1048 if (ret < 0) {
1049 ret = -E_FORK;
1050 goto out;
1051 }
1052 if (ret)
1053 server_loop(ret);
1054 for (i = 0; cmd[i].name; i++) {
1055 if (strcmp(cmd[i].name, argv[1]))
1056 continue;
1057 ret = cmd[i].handler(1, argc - 1 , argv + 1);
1058 goto out;
1059
1060 }
1061 PARA_ERROR_LOG("unknown command: %s\n", argv[1]);
1062 ret = -1;
1063 out:
1064 if (ret < 0)
1065 PARA_ERROR_LOG("error %d\n", ret);
1066 else
1067 PARA_DEBUG_LOG("%s", "success\n");
1068 afs_shutdown(0);
1069 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1070 }
1071 #endif