1 /**************************************************************************/
2 /* ---------------------------------------------------------------------- */
3 /* Copyright (C) 2006 - 2008 FRESCOR consortium partners: */
5 /* Universidad de Cantabria, SPAIN */
6 /* University of York, UK */
7 /* Scuola Superiore Sant'Anna, ITALY */
8 /* Kaiserslautern University, GERMANY */
9 /* Univ. Politécnica Valencia, SPAIN */
10 /* Czech Technical University in Prague, CZECH REPUBLIC */
12 /* Thales Communication S.A. FRANCE */
13 /* Visual Tools S.A. SPAIN */
14 /* Rapita Systems Ltd UK */
17 /* See http://www.frescor.org for a link to partners' websites */
19 /* FRESCOR project (FP6/2005/IST/5-034026) is funded */
20 /* in part by the European Union Sixth Framework Programme */
21 /* The European Union is not liable of any use that may be */
22 /* made of this code. */
25 /* This file is part of FORB (Frescor Object Request Broker) */
27 /* FORB is free software; you can redistribute it and/or modify it */
28 /* under terms of the GNU General Public License as published by the */
29 /* Free Software Foundation; either version 2, or (at your option) any */
30 /* later version. FORB is distributed in the hope that it will be */
31 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
32 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
33 /* General Public License for more details. You should have received a */
34 /* copy of the GNU General Public License along with FORB; see file */
35 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
36 /* Cambridge, MA 02139, USA. */
38 /* As a special exception, including FORB header files in a file, */
39 /* instantiating FORB generics or templates, or linking other files */
40 /* with FORB objects to produce an executable application, does not */
41 /* by itself cause the resulting executable application to be covered */
42 /* by the GNU General Public License. This exception does not */
43 /* however invalidate any other reasons why the executable file might be */
44 /* covered by the GNU Public License. */
45 /**************************************************************************/
49 * @author Michal Sojka <sojkam1@fel.cvut.cz>
50 * @date Sun Oct 12 16:57:01 2008
52 * @brief Implementation of basic FORB's functions.
57 #define _BSD_SOURCE /* Because of on_exit() */
61 #include <forb/config.h>
62 #include <forb/forb-internal.h>
66 #include <forb/object.h>
67 #include <forb/uuid.h>
72 #include <sys/types.h>
73 #include <ul_gavlcust.h>
75 #include <ul_logreg.h>
77 #ifdef CONFIG_FORB_PROTO_UNIX
78 #include <forb/proto_unix.h>
82 #define UL_LOGL_DEF UL_LOGL_DEB
84 #define UL_LOGL_DEF UL_LOGL_ERR
86 #include "log_domains.inc"
88 extern UL_LOG_CUST(ulogd_forb);
92 destroy_forb_on_exit(int exitcode, void *arg)
99 forb_is_alive(forb_orb _obj, CORBA_Environment *ev)
101 ul_logdeb("%s called\n", __FUNCTION__);
104 static struct forb_forb_orb_impl forb_implementation = {
105 .is_alive = forb_is_alive,
109 * Prepares #FORB_TMP_DIR directory for use by forb
111 * @return Zero on succes, -1 on error and errno is set appropriately.
114 forb_init_tmp_dir(void)
119 ret = stat(FORB_TMP_DIR, &st);
121 if (ret == 0 && !S_ISDIR(st.st_mode)) {
122 ret = unlink(FORB_TMP_DIR);
124 } else if (ret == 0) {
127 return mkdir(FORB_TMP_DIR, 0777);
131 * Thread for execution of remote requests for a FORB object.
138 forb_execution_thread(void *arg)
142 forb_execute_object(orb);
147 forb_init(int *argc, char **argv[], const char *orb_id)
153 forb = forb_malloc(sizeof(*forb));
155 memset(forb, 0, sizeof(*forb));
157 /* Initialize ULUT logging facility */
158 ul_logreg_domains_static(ul_log_domains_array,
159 sizeof(ul_log_domains_array)/sizeof(ul_log_domains_array[0]));
161 forb_server_id_init(&forb->server_id);
162 forb_server_id_to_string(forb->server_id_str, &forb->server_id,
163 sizeof(forb->server_id_str));
164 ul_logdeb("Initializing forb %s\n", forb->server_id_str);
166 if (fosa_mutex_init(&forb->request_id_mutex, 0) != 0) goto err2;
167 if (fosa_mutex_init(&forb->port_mutex, 0) != 0) goto err2;
168 forb_port_init_head(forb);
170 if (fosa_mutex_init(&forb->request_mutex, 0) != 0) goto err2;
171 forb_request_nolock_init_root_field(forb);
173 if (fosa_mutex_init(&forb->peer_mutex, 0) != 0) goto err2;
174 forb_peer_nolock_init_root_field(forb);
176 if (fosa_mutex_init(&forb->objkey_mutex, 0) != 0) goto err2;
177 forb_objects_nolock_init_root_field(forb);
179 if (fosa_mutex_init(&forb->regref_mutex, 0) != 0) goto err2;
180 forb_regref_nolock_init_root_field(forb);
182 ret = forb_init_tmp_dir();
184 ul_logerr("Cannot prepare " FORB_TMP_DIR "\n");
188 orb = forb_forb_orb_new(NULL, &forb_implementation, forb);
190 /* Server ID must be assigned manualy */
191 orb->server = forb->server_id;
195 /* Insert our object reference to objects tree, so that we
196 * can accept remote request to our new ORB. */
197 forb_objects_nolock_insert(forb, orb);
199 ret = fosa_thread_create(&forb->execution_thread, NULL,
200 forb_execution_thread, orb);
204 on_exit(destroy_forb_on_exit, orb);
206 #ifdef CONFIG_FORB_PROTO_UNIX
208 forb_port_t *port = forb_malloc(sizeof(*port));
210 memset(port, 0, sizeof(*port));
211 ret = forb_unix_port_init(&port->desc, &forb->server_id);
212 if (ret) goto err_free_unix;
213 ret = forb_register_port(orb, port);
214 if (ret) goto err_free_unix; /* TODO: forb_unix_port_done() */
225 err2: forb_free(forb);
229 /* FIXME: forb_destroy is now called automatically on exit. Therefore
230 * forb_destroy() should be either static or should deregister on_exit
231 * handler (how???). */
232 void forb_destroy(forb_orb orb)
234 forb_t *forb = forb_object_to_forb(orb);
236 forb_regref_t *regref;
238 pthread_cancel(forb->execution_thread.pthread_id);
239 pthread_join(forb->execution_thread.pthread_id, NULL);
241 /* Unregister all registered references */
242 while ((regref = forb_regref_first(forb))) {
243 forb_unregister_reference(orb, regref->name.str);
246 ul_list_for_each_cut(forb_port, forb, port) {
247 forb_destroy_port(port);
249 forb_object_release(orb);
254 /* forb_register_interface(const struct forb_interface *interface) */
256 /* gavl_insert(&type_registry, &interface->node); */
260 * Initializes server ID variable.
262 * @param server_id Serer ID to initialize.
265 forb_server_id_init(forb_server_id *server_id)
267 forb_uuid_generate((forb_uuid_t*)server_id->uuid);
271 * Checks whether the @a object is stale. Stale object is an object
272 * reference whose server cannot be contacted to handle requests.
274 * @param object Object reference to check.
276 * @return True if the object is stale, false otherwise.
278 bool forb_object_is_stale(forb_object object)
284 remote_orb = forb_get_orb_of(object);
285 if (!remote_orb) { /* This shohuld never happen */
288 /* TODO: Check not only the ORB, but also whether the object
289 * is still registered with the remote orb. */
290 forb_orb_is_alive(remote_orb, &env);
291 if (env.major == FORB_EX_COMM_FAILURE) {
292 /* Orb is not alive */
295 if (forb_exception_occurred(&env)) {
296 ul_logerr("%s: unexpected exception: %s\n", __FUNCTION__, forb_strerror(&env));
301 forb_object_release(remote_orb);
312 * @return Zero on success, -1 on error.
315 rewrite_regref(int fd, const char *objref)
318 int len = strlen(objref);
319 lseek(fd, 0, SEEK_SET);
323 ret = write(fd, objref, len);
324 if (ret < 0) goto out;
328 ret = 0; /* Success */
337 * @param fn File name
338 * @param objref string form of the object reference
340 * @return -1 on error, 0 if reference was replaced and 1 in the
341 * reference is valid.
344 replace_regref_if_stale(forb_orb orb, const char *fn, const char *objref)
350 fd = open(fn, O_RDWR);
355 ret = lockf(fd, F_LOCK, 0);
356 if (ret < 0) goto close_err;
357 ret = read(fd, str, sizeof(str)-1);
358 if (ret < 0) goto unlock_err;
359 /* TODO: Check that we have read the whole file */
362 object = forb_string_to_object(orb, str);
364 /* reference is unreadable, so we can replace it */
365 ret = rewrite_regref(fd, objref);
366 /* We are done for now */
369 if (forb_object_is_stale(object)) {
370 /* Orb is not alive */
371 ret = rewrite_regref(fd, objref);
373 /* Reference's FORB is alive :-( */
377 forb_object_release(object);
379 lockf(fd, F_ULOCK, 0);
388 * Registers a given object reference so that other FORBs on the same
389 * node can find it by using forb_resolve_reference().
391 * @param object Object reference to register.
392 * @param name Name under which to register the reference.
394 * @return Zero on success, -1 on error.
397 forb_register_reference(forb_object object, const char *name)
399 forb_regref_t *regref;
400 forb_regref_name_t regname;
401 forb_t *forb = forb_object_to_forb(object);
402 char fn[100], fntmp[100];
407 strncpy(regname.str, name, FORB_REGREF_NAME_LEN-1);
408 regname.str[FORB_REGREF_NAME_LEN-1]='\0';
410 regref = forb_regref_new(object, regname);
411 if (!regref) goto err;
413 forb_regref_insert(forb, regref);
415 snprintf(fn, sizeof(fn), FORB_TMP_DIR "/%s", regname.str);
416 snprintf(fntmp, sizeof(fntmp), FORB_TMP_DIR "/%s.%s", regname.str,
417 forb->server_id_str);
419 f = fopen(fntmp, "w");
420 if (!f) goto unalloc_err;
422 objref = forb_object_to_string(object);
423 if (!objref) goto unlink_err;
425 ret = fprintf(f, "%s", objref);
426 if (ret < 0) goto free_objref_err;
429 if (ret == EOF) goto free_objref_err;
431 /* Make the atomic registration in filesystem */
432 ret = link(fntmp, fn);
434 if (ret < 0 && errno == EEXIST) {
435 /* The reference exists. Try whether it is still
437 if (replace_regref_if_stale(object->orb, fn, objref) != 0) {
438 goto free_objref_err;
440 ul_logdeb("Stale registration replaced\n");
441 } else if (ret < 0) {
442 goto free_objref_err;
447 /* Unlink the temporary filename */
461 forb_regref_delete(forb, regref);
462 forb_regref_release(regref);
469 * Unregister reference previously registered by
470 * forb_register_reference().
472 * @param orb forb::orb reference
473 * @param name Name to unregister.
475 * @return Zero on success, -1 on error.
478 forb_unregister_reference(forb_orb orb, const char *name)
480 forb_regref_t *regref;
481 forb_regref_name_t regname;
482 forb_t *forb = forb_object_to_forb(orb);
485 strncpy(regname.str, name, FORB_REGREF_NAME_LEN-1);
486 regname.str[FORB_REGREF_NAME_LEN-1]='\0';
488 regref = forb_regref_find(forb, ®name);
489 if (!regref) goto err;
491 forb_regref_delete(forb, regref);
492 forb_regref_release(regref);
494 snprintf(fn, sizeof(fn), FORB_TMP_DIR "/%s", regname.str);
503 * Returns a named reference previously registered by
504 * forb_register_reference(). This function can be called even if the
505 * reference was registered in a diferent process (but on the same
508 * @param orb Local orb object reference
509 * @param name Name under which the reference was registered.
511 * @return Object reference on NULL in case of error.
514 forb_resolve_reference(const forb_orb orb, const char *name)
516 forb_regref_name_t regname;
522 strncpy(regname.str, name, FORB_REGREF_NAME_LEN-1);
523 regname.str[FORB_REGREF_NAME_LEN-1]='\0';
525 snprintf(fn, sizeof(fn), FORB_TMP_DIR "/%s", regname.str);
531 ret = read(fd, str, sizeof(str)-1);
532 /* TODO: Check that we have read the whole file */
534 object = forb_string_to_object(orb, str);
537 if (forb_object_is_stale(object)) {
538 forb_object_release(object);
546 * Returns object reference of forb::orb object associated with the
554 forb_get_orb_of(const forb_object obj)
558 if (forb_server_id_cmp(&obj->server, &obj->orb->server) == 0) {
559 orb = forb_object_duplicate(obj->orb);
561 orb = forb_object_new(obj->orb, &obj->server, 0);
567 * Returns server ID of an object reference.
573 forb_get_server_id(const forb_object obj, forb_server_id *dest)
582 * Return instance data registered when the object was created by
585 * @param obj Object reference
587 * @return Pointer to the registered data.
590 forb_instance_data(const forb_object obj)
592 return forb_object_instance_data(obj);
596 * Returns error message correspondings FORB exception.
598 * @param env Environemnt
600 * @return Non-NULL pointer to a string.
603 forb_strerror(CORBA_Environment *env)
606 return "Invalid environemnt";
608 #define ex(e) case FORB_EX_##e: return #e; break;
609 switch (env->major) {
630 ex(OBJECT_NOT_EXIST);
635 return "Invalid error number";
639 * Return server id of the requesting application.
641 * This function should be only called from within interface
644 * @param[in] obj Object being requested
645 * @param[out] req_source Server ID of the requesting application
648 forb_get_req_source(const forb_object obj, forb_server_id *req_source)
651 if (obj && obj->exec_req) {
652 *req_source = obj->exec_req->source;
654 memset(req_source, 0, sizeof(*req_source));