Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2017 Intel Corporation.
3 : * All rights reserved.
4 : */
5 :
6 : #include "spdk/stdinc.h"
7 :
8 : #include "spdk/env.h"
9 : #include "spdk/trace.h"
10 : #include "spdk/log.h"
11 : #include "spdk/util.h"
12 : #include "trace_internal.h"
13 : #include "spdk/bit_array.h"
14 :
15 : static struct spdk_trace_register_fn *g_reg_fn_head = NULL;
16 : static struct {
17 : uint16_t *ring;
18 : uint32_t head;
19 : uint32_t tail;
20 : uint32_t size;
21 : pthread_spinlock_t lock;
22 : } g_owner_ids;
23 :
24 38 : SPDK_LOG_REGISTER_COMPONENT(trace)
25 :
26 : uint64_t
27 0 : spdk_trace_get_tpoint_mask(uint32_t group_id)
28 : {
29 0 : if (group_id >= SPDK_TRACE_MAX_GROUP_ID) {
30 0 : SPDK_ERRLOG("invalid group ID %d\n", group_id);
31 0 : return 0ULL;
32 : }
33 :
34 0 : if (g_trace_file == NULL) {
35 0 : return 0ULL;
36 : }
37 :
38 0 : return g_trace_file->tpoint_mask[group_id];
39 0 : }
40 :
41 : void
42 0 : spdk_trace_set_tpoints(uint32_t group_id, uint64_t tpoint_mask)
43 : {
44 0 : if (g_trace_file == NULL) {
45 0 : SPDK_ERRLOG("trace is not initialized\n");
46 0 : return;
47 : }
48 :
49 0 : if (group_id >= SPDK_TRACE_MAX_GROUP_ID) {
50 0 : SPDK_ERRLOG("invalid group ID %d\n", group_id);
51 0 : return;
52 : }
53 :
54 0 : g_trace_file->tpoint_mask[group_id] |= tpoint_mask;
55 0 : }
56 :
57 : void
58 0 : spdk_trace_clear_tpoints(uint32_t group_id, uint64_t tpoint_mask)
59 : {
60 0 : if (g_trace_file == NULL) {
61 0 : SPDK_ERRLOG("trace is not initialized\n");
62 0 : return;
63 : }
64 :
65 0 : if (group_id >= SPDK_TRACE_MAX_GROUP_ID) {
66 0 : SPDK_ERRLOG("invalid group ID %d\n", group_id);
67 0 : return;
68 : }
69 :
70 0 : g_trace_file->tpoint_mask[group_id] &= ~tpoint_mask;
71 0 : }
72 :
73 : uint64_t
74 0 : spdk_trace_get_tpoint_group_mask(void)
75 : {
76 0 : uint64_t mask = 0x0;
77 : int i;
78 :
79 0 : for (i = 0; i < SPDK_TRACE_MAX_GROUP_ID; i++) {
80 0 : if (spdk_trace_get_tpoint_mask(i) != 0) {
81 0 : mask |= (1ULL << i);
82 0 : }
83 0 : }
84 :
85 0 : return mask;
86 : }
87 :
88 : void
89 0 : spdk_trace_set_tpoint_group_mask(uint64_t tpoint_group_mask)
90 : {
91 : int i;
92 :
93 0 : if (g_trace_file == NULL) {
94 0 : SPDK_ERRLOG("trace is not initialized\n");
95 0 : return;
96 : }
97 :
98 0 : for (i = 0; i < SPDK_TRACE_MAX_GROUP_ID; i++) {
99 0 : if (tpoint_group_mask & (1ULL << i)) {
100 0 : spdk_trace_set_tpoints(i, -1ULL);
101 0 : }
102 0 : }
103 0 : }
104 :
105 : void
106 0 : spdk_trace_clear_tpoint_group_mask(uint64_t tpoint_group_mask)
107 : {
108 : int i;
109 :
110 0 : if (g_trace_file == NULL) {
111 0 : SPDK_ERRLOG("trace is not initialized\n");
112 0 : return;
113 : }
114 :
115 0 : for (i = 0; i < SPDK_TRACE_MAX_GROUP_ID; i++) {
116 0 : if (tpoint_group_mask & (1ULL << i)) {
117 0 : spdk_trace_clear_tpoints(i, -1ULL);
118 0 : }
119 0 : }
120 0 : }
121 :
122 : struct spdk_trace_register_fn *
123 0 : spdk_trace_get_first_register_fn(void)
124 : {
125 0 : return g_reg_fn_head;
126 : }
127 :
128 : struct spdk_trace_register_fn *
129 0 : spdk_trace_get_next_register_fn(struct spdk_trace_register_fn *register_fn)
130 : {
131 0 : return register_fn->next;
132 : }
133 :
134 : uint64_t
135 0 : spdk_trace_create_tpoint_group_mask(const char *group_name)
136 : {
137 0 : uint64_t tpoint_group_mask = 0;
138 : struct spdk_trace_register_fn *register_fn;
139 :
140 0 : register_fn = spdk_trace_get_first_register_fn();
141 0 : if (strcmp(group_name, "all") == 0) {
142 0 : while (register_fn) {
143 0 : tpoint_group_mask |= (1UL << register_fn->tgroup_id);
144 :
145 0 : register_fn = spdk_trace_get_next_register_fn(register_fn);
146 : }
147 0 : } else {
148 0 : while (register_fn) {
149 0 : if (strcmp(group_name, register_fn->name) == 0) {
150 0 : break;
151 : }
152 :
153 0 : register_fn = spdk_trace_get_next_register_fn(register_fn);
154 : }
155 :
156 0 : if (register_fn != NULL) {
157 0 : tpoint_group_mask |= (1UL << register_fn->tgroup_id);
158 0 : }
159 : }
160 :
161 0 : return tpoint_group_mask;
162 : }
163 :
164 : int
165 0 : spdk_trace_enable_tpoint_group(const char *group_name)
166 : {
167 0 : uint64_t tpoint_group_mask = 0;
168 :
169 0 : if (g_trace_file == NULL) {
170 0 : return -1;
171 : }
172 :
173 0 : tpoint_group_mask = spdk_trace_create_tpoint_group_mask(group_name);
174 0 : if (tpoint_group_mask == 0) {
175 0 : return -1;
176 : }
177 :
178 0 : spdk_trace_set_tpoint_group_mask(tpoint_group_mask);
179 0 : return 0;
180 0 : }
181 :
182 : int
183 0 : spdk_trace_disable_tpoint_group(const char *group_name)
184 : {
185 0 : uint64_t tpoint_group_mask = 0;
186 :
187 0 : if (g_trace_file == NULL) {
188 0 : return -1;
189 : }
190 :
191 0 : tpoint_group_mask = spdk_trace_create_tpoint_group_mask(group_name);
192 0 : if (tpoint_group_mask == 0) {
193 0 : return -1;
194 : }
195 :
196 0 : spdk_trace_clear_tpoint_group_mask(tpoint_group_mask);
197 0 : return 0;
198 0 : }
199 :
200 : void
201 3 : spdk_trace_mask_usage(FILE *f, const char *tmask_arg)
202 : {
203 : #define LINE_PREFIX " "
204 : #define ENTRY_SEPARATOR ", "
205 : #define MAX_LINE_LENGTH 100
206 3 : uint64_t prefix_len = strlen(LINE_PREFIX);
207 3 : uint64_t separator_len = strlen(ENTRY_SEPARATOR);
208 3 : const char *first_entry = "group_name - tracepoint group name for spdk trace buffers (";
209 3 : const char *last_entry = "all).";
210 : uint64_t curr_line_len;
211 : uint64_t curr_entry_len;
212 : struct spdk_trace_register_fn *register_fn;
213 :
214 3 : fprintf(f, " %s, --tpoint-group <group-name>[:<tpoint_mask>]\n", tmask_arg);
215 3 : fprintf(f, "%s%s", LINE_PREFIX, first_entry);
216 3 : curr_line_len = prefix_len + strlen(first_entry);
217 :
218 3 : register_fn = g_reg_fn_head;
219 3 : while (register_fn) {
220 3 : curr_entry_len = strlen(register_fn->name);
221 3 : if ((curr_line_len + curr_entry_len + separator_len > MAX_LINE_LENGTH)) {
222 0 : fprintf(f, "\n%s", LINE_PREFIX);
223 0 : curr_line_len = prefix_len;
224 0 : }
225 :
226 3 : fprintf(f, "%s%s", register_fn->name, ENTRY_SEPARATOR);
227 3 : curr_line_len += curr_entry_len + separator_len;
228 :
229 3 : if (register_fn->next == NULL) {
230 3 : if (curr_line_len + strlen(last_entry) > MAX_LINE_LENGTH) {
231 0 : fprintf(f, " ");
232 0 : }
233 3 : fprintf(f, "%s\n", last_entry);
234 3 : break;
235 : }
236 :
237 0 : register_fn = register_fn->next;
238 : }
239 :
240 3 : fprintf(f, "%stpoint_mask - tracepoint mask for enabling individual tpoints inside\n",
241 : LINE_PREFIX);
242 3 : fprintf(f, "%sa tracepoint group. First tpoint inside a group can be enabled by\n",
243 : LINE_PREFIX);
244 3 : fprintf(f, "%ssetting tpoint_mask to 1 (e.g. bdev:0x1). Groups and masks can be\n",
245 : LINE_PREFIX);
246 3 : fprintf(f, "%scombined (e.g. thread,bdev:0x1). All available tpoints can be found\n",
247 : LINE_PREFIX);
248 3 : fprintf(f, "%sin /include/spdk_internal/trace_defs.h\n", LINE_PREFIX);
249 3 : }
250 :
251 : void
252 0 : spdk_trace_register_owner_type(uint8_t type, char id_prefix)
253 : {
254 : struct spdk_trace_owner_type *owner_type;
255 :
256 0 : assert(type != OWNER_TYPE_NONE);
257 :
258 0 : if (g_trace_file == NULL) {
259 0 : SPDK_ERRLOG("trace is not initialized\n");
260 0 : return;
261 : }
262 :
263 : /* 'owner_type' has 256 entries and since 'type' is a uint8_t, it
264 : * can't overrun the array.
265 : */
266 0 : owner_type = &g_trace_file->owner_type[type];
267 0 : assert(owner_type->type == 0);
268 :
269 0 : owner_type->type = type;
270 0 : owner_type->id_prefix = id_prefix;
271 0 : }
272 :
273 : static void
274 0 : _owner_set_description(uint16_t owner_id, const char *description, bool append)
275 : {
276 : struct spdk_trace_owner *owner;
277 0 : char old[256] = {};
278 :
279 0 : assert(sizeof(old) >= g_trace_file->owner_description_size);
280 0 : owner = spdk_get_trace_owner(g_trace_file, owner_id);
281 0 : assert(owner != NULL);
282 0 : if (append) {
283 0 : memcpy(old, owner->description, g_trace_file->owner_description_size);
284 0 : }
285 :
286 0 : snprintf(owner->description, g_trace_file->owner_description_size,
287 0 : "%s%s%s", old, append ? " " : "", description);
288 0 : }
289 :
290 : uint16_t
291 329 : spdk_trace_register_owner(uint8_t owner_type, const char *description)
292 : {
293 : struct spdk_trace_owner *owner;
294 : uint32_t owner_id;
295 :
296 329 : if (g_owner_ids.ring == NULL) {
297 : /* Help the unit test environment by simply returning instead
298 : * of requiring it to initialize the trace library.
299 : */
300 329 : return 0;
301 : }
302 :
303 0 : pthread_spin_lock(&g_owner_ids.lock);
304 :
305 0 : if (g_owner_ids.head == g_owner_ids.tail) {
306 : /* No owner ids available. Return 0 which means no owner. */
307 0 : pthread_spin_unlock(&g_owner_ids.lock);
308 0 : return 0;
309 : }
310 :
311 0 : owner_id = g_owner_ids.ring[g_owner_ids.head];
312 0 : if (++g_owner_ids.head == g_owner_ids.size) {
313 0 : g_owner_ids.head = 0;
314 0 : }
315 :
316 0 : owner = spdk_get_trace_owner(g_trace_file, owner_id);
317 0 : owner->tsc = spdk_get_ticks();
318 0 : owner->type = owner_type;
319 0 : _owner_set_description(owner_id, description, false);
320 0 : pthread_spin_unlock(&g_owner_ids.lock);
321 0 : return owner_id;
322 329 : }
323 :
324 : void
325 132 : spdk_trace_unregister_owner(uint16_t owner_id)
326 : {
327 132 : if (g_owner_ids.ring == NULL) {
328 : /* Help the unit test environment by simply returning instead
329 : * of requiring it to initialize the trace library.
330 : */
331 132 : return;
332 : }
333 :
334 0 : if (owner_id == 0) {
335 : /* owner_id 0 means no owner. Allow this to be passed here, it
336 : * avoids caller having to do extra checking.
337 : */
338 0 : return;
339 : }
340 :
341 0 : pthread_spin_lock(&g_owner_ids.lock);
342 0 : g_owner_ids.ring[g_owner_ids.tail] = owner_id;
343 0 : if (++g_owner_ids.tail == g_owner_ids.size) {
344 0 : g_owner_ids.tail = 0;
345 0 : }
346 0 : pthread_spin_unlock(&g_owner_ids.lock);
347 132 : }
348 :
349 : void
350 0 : spdk_trace_owner_set_description(uint16_t owner_id, const char *description)
351 : {
352 0 : if (g_owner_ids.ring == NULL) {
353 : /* Help the unit test environment by simply returning instead
354 : * of requiring it to initialize the trace library.
355 : */
356 0 : return;
357 : }
358 :
359 0 : pthread_spin_lock(&g_owner_ids.lock);
360 0 : _owner_set_description(owner_id, description, false);
361 0 : pthread_spin_unlock(&g_owner_ids.lock);
362 0 : }
363 :
364 : void
365 8 : spdk_trace_owner_append_description(uint16_t owner_id, const char *description)
366 : {
367 8 : if (g_owner_ids.ring == NULL) {
368 : /* Help the unit test environment by simply returning instead
369 : * of requiring it to initialize the trace library.
370 : */
371 8 : return;
372 : }
373 :
374 0 : if (owner_id == 0) {
375 : /* owner_id 0 means no owner. Allow this to be passed here, it
376 : * avoids caller having to do extra checking.
377 : */
378 0 : return;
379 : }
380 :
381 0 : pthread_spin_lock(&g_owner_ids.lock);
382 0 : _owner_set_description(owner_id, description, true);
383 0 : pthread_spin_unlock(&g_owner_ids.lock);
384 8 : }
385 :
386 : void
387 0 : spdk_trace_register_object(uint8_t type, char id_prefix)
388 : {
389 : struct spdk_trace_object *object;
390 :
391 0 : assert(type != OBJECT_NONE);
392 :
393 0 : if (g_trace_file == NULL) {
394 0 : SPDK_ERRLOG("trace is not initialized\n");
395 0 : return;
396 : }
397 :
398 : /* 'object' has 256 entries and since 'type' is a uint8_t, it
399 : * can't overrun the array.
400 : */
401 0 : object = &g_trace_file->object[type];
402 0 : assert(object->type == 0);
403 :
404 0 : object->type = type;
405 0 : object->id_prefix = id_prefix;
406 0 : }
407 :
408 : static void
409 0 : trace_register_description(const struct spdk_trace_tpoint_opts *opts)
410 : {
411 : struct spdk_trace_tpoint *tpoint;
412 : size_t i, max_name_length;
413 :
414 0 : assert(opts->tpoint_id < SPDK_TRACE_MAX_TPOINT_ID);
415 :
416 0 : if (strnlen(opts->name, sizeof(tpoint->name)) == sizeof(tpoint->name)) {
417 0 : SPDK_ERRLOG("name (%s) too long\n", opts->name);
418 0 : }
419 :
420 0 : tpoint = &g_trace_file->tpoint[opts->tpoint_id];
421 0 : assert(tpoint->tpoint_id == 0);
422 :
423 0 : snprintf(tpoint->name, sizeof(tpoint->name), "%s", opts->name);
424 0 : tpoint->tpoint_id = opts->tpoint_id;
425 0 : tpoint->object_type = opts->object_type;
426 0 : tpoint->owner_type = opts->owner_type;
427 0 : tpoint->new_object = opts->new_object;
428 :
429 0 : max_name_length = sizeof(tpoint->args[0].name);
430 0 : for (i = 0; i < SPDK_TRACE_MAX_ARGS_COUNT; ++i) {
431 0 : if (!opts->args[i].name || opts->args[i].name[0] == '\0') {
432 0 : break;
433 : }
434 :
435 0 : switch (opts->args[i].type) {
436 : case SPDK_TRACE_ARG_TYPE_INT:
437 : case SPDK_TRACE_ARG_TYPE_PTR:
438 : /* The integers and pointers have to be exactly 4 or 8 bytes */
439 0 : assert(opts->args[i].size == 4 || opts->args[i].size == 8);
440 0 : break;
441 : case SPDK_TRACE_ARG_TYPE_STR:
442 : /* Strings need to have at least one byte for the NULL terminator */
443 0 : assert(opts->args[i].size > 0);
444 0 : break;
445 : default:
446 0 : assert(0 && "invalid trace argument type");
447 : break;
448 : }
449 :
450 0 : if (strnlen(opts->args[i].name, max_name_length) == max_name_length) {
451 0 : SPDK_ERRLOG("argument name (%s) is too long\n", opts->args[i].name);
452 0 : }
453 :
454 0 : snprintf(tpoint->args[i].name, sizeof(tpoint->args[i].name),
455 0 : "%s", opts->args[i].name);
456 0 : tpoint->args[i].type = opts->args[i].type;
457 0 : tpoint->args[i].size = opts->args[i].size;
458 0 : }
459 :
460 0 : tpoint->num_args = i;
461 0 : }
462 :
463 : void
464 0 : spdk_trace_register_description_ext(const struct spdk_trace_tpoint_opts *opts, size_t num_opts)
465 : {
466 : size_t i;
467 :
468 0 : if (g_trace_file == NULL) {
469 0 : SPDK_ERRLOG("trace is not initialized\n");
470 0 : return;
471 : }
472 :
473 0 : for (i = 0; i < num_opts; ++i) {
474 0 : trace_register_description(&opts[i]);
475 0 : }
476 0 : }
477 :
478 : void
479 0 : spdk_trace_register_description(const char *name, uint16_t tpoint_id, uint8_t owner_type,
480 : uint8_t object_type, uint8_t new_object,
481 : uint8_t arg1_type, const char *arg1_name)
482 : {
483 0 : struct spdk_trace_tpoint_opts opts = {
484 0 : .name = name,
485 0 : .tpoint_id = tpoint_id,
486 0 : .owner_type = owner_type,
487 0 : .object_type = object_type,
488 0 : .new_object = new_object,
489 0 : .args = {{
490 0 : .name = arg1_name,
491 0 : .type = arg1_type,
492 : .size = sizeof(uint64_t)
493 : }
494 : }
495 : };
496 :
497 0 : spdk_trace_register_description_ext(&opts, 1);
498 0 : }
499 :
500 : void
501 0 : spdk_trace_tpoint_register_relation(uint16_t tpoint_id, uint8_t object_type, uint8_t arg_index)
502 : {
503 : struct spdk_trace_tpoint *tpoint;
504 : uint16_t i;
505 :
506 0 : assert(object_type != OBJECT_NONE);
507 0 : assert(tpoint_id != OBJECT_NONE);
508 :
509 0 : if (g_trace_file == NULL) {
510 0 : SPDK_ERRLOG("trace is not initialized\n");
511 0 : return;
512 : }
513 :
514 : /* We do not check whether a tpoint_id exists here, because
515 : * there is no order in which trace definitions are registered.
516 : * This way we can create relations between tpoint and objects
517 : * that will be declared later. */
518 0 : tpoint = &g_trace_file->tpoint[tpoint_id];
519 0 : for (i = 0; i < SPDK_COUNTOF(tpoint->related_objects); ++i) {
520 0 : if (tpoint->related_objects[i].object_type == OBJECT_NONE) {
521 0 : tpoint->related_objects[i].object_type = object_type;
522 0 : tpoint->related_objects[i].arg_index = arg_index;
523 0 : return;
524 : }
525 0 : }
526 0 : SPDK_ERRLOG("Unable to register new relation for tpoint %" PRIu16 ", object %" PRIu8 "\n",
527 : tpoint_id, object_type);
528 0 : }
529 :
530 : void
531 53 : spdk_trace_add_register_fn(struct spdk_trace_register_fn *reg_fn)
532 : {
533 : struct spdk_trace_register_fn *_reg_fn;
534 :
535 53 : if (reg_fn->name == NULL) {
536 0 : SPDK_ERRLOG("missing name for registering spdk trace tpoint group\n");
537 0 : assert(false);
538 : return;
539 : }
540 :
541 53 : if (strcmp(reg_fn->name, "all") == 0) {
542 0 : SPDK_ERRLOG("illegal name (%s) for tpoint group\n", reg_fn->name);
543 0 : assert(false);
544 : return;
545 : }
546 :
547 : /* Ensure that no trace point group IDs and names are ever duplicated */
548 70 : for (_reg_fn = g_reg_fn_head; _reg_fn; _reg_fn = _reg_fn->next) {
549 17 : if (reg_fn->tgroup_id == _reg_fn->tgroup_id) {
550 0 : SPDK_ERRLOG("group %d, %s has duplicate tgroup_id with %s\n",
551 : reg_fn->tgroup_id, reg_fn->name, _reg_fn->name);
552 0 : assert(false);
553 : return;
554 : }
555 :
556 17 : if (strcmp(reg_fn->name, _reg_fn->name) == 0) {
557 0 : SPDK_ERRLOG("name %s is duplicated between groups with ids %d and %d\n",
558 : reg_fn->name, reg_fn->tgroup_id, _reg_fn->tgroup_id);
559 0 : assert(false);
560 : return;
561 : }
562 17 : }
563 :
564 : /* Arrange trace registration in order on tgroup_id */
565 53 : if (g_reg_fn_head == NULL || reg_fn->tgroup_id < g_reg_fn_head->tgroup_id) {
566 41 : reg_fn->next = g_reg_fn_head;
567 41 : g_reg_fn_head = reg_fn;
568 41 : return;
569 : }
570 :
571 12 : for (_reg_fn = g_reg_fn_head; _reg_fn; _reg_fn = _reg_fn->next) {
572 12 : if (_reg_fn->next == NULL || reg_fn->tgroup_id < _reg_fn->next->tgroup_id) {
573 12 : reg_fn->next = _reg_fn->next;
574 12 : _reg_fn->next = reg_fn;
575 12 : return;
576 : }
577 0 : }
578 53 : }
579 :
580 : int
581 0 : trace_flags_init(void)
582 : {
583 : struct spdk_trace_register_fn *reg_fn;
584 : uint16_t i;
585 : uint16_t owner_id_start;
586 : int rc;
587 :
588 0 : reg_fn = g_reg_fn_head;
589 0 : while (reg_fn) {
590 0 : reg_fn->reg_fn();
591 0 : reg_fn = reg_fn->next;
592 : }
593 :
594 : /* We will not use owner_id 0, it will be reserved to mean "no owner".
595 : * But for now, we will start with owner_id 256 instead of owner_id 1.
596 : * This will account for some libraries and modules which pass a
597 : * "poller_id" to spdk_trace_record() which is now an owner_id. Until
598 : * all of those libraries and modules are converted, we will start
599 : * owner_ids at 256 to avoid collisions.
600 : */
601 0 : owner_id_start = 256;
602 0 : g_owner_ids.ring = calloc(g_trace_file->num_owners, sizeof(uint16_t));
603 0 : if (g_owner_ids.ring == NULL) {
604 0 : SPDK_ERRLOG("could not allocate g_owner_ids.ring\n");
605 0 : return -ENOMEM;
606 : }
607 0 : g_owner_ids.head = 0;
608 0 : g_owner_ids.tail = g_trace_file->num_owners - owner_id_start;
609 0 : g_owner_ids.size = g_trace_file->num_owners;
610 0 : for (i = 0; i < g_owner_ids.tail; i++) {
611 0 : g_owner_ids.ring[i] = i + owner_id_start;
612 0 : }
613 :
614 0 : rc = pthread_spin_init(&g_owner_ids.lock, PTHREAD_PROCESS_PRIVATE);
615 0 : if (rc != 0) {
616 0 : free(g_owner_ids.ring);
617 0 : g_owner_ids.ring = NULL;
618 0 : }
619 :
620 0 : return rc;
621 0 : }
622 :
623 : void
624 0 : trace_flags_fini(void)
625 : {
626 0 : if (g_owner_ids.ring == NULL) {
627 0 : return;
628 : }
629 0 : pthread_spin_destroy(&g_owner_ids.lock);
630 0 : free(g_owner_ids.ring);
631 0 : g_owner_ids.ring = NULL;
632 0 : }
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