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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef prtrace_h___
7 #define prtrace_h___
8 /*
9 ** prtrace.h -- NSPR's Trace Facility.
10 **
11 ** The Trace Facility provides a means to trace application
12 ** program events within a process. When implementing an
13 ** application program an engineer may insert a "Trace" function
14 ** call, passing arguments to be traced. The "Trace" function
15 ** combines the user trace data with identifying data and
16 ** writes this data in time ordered sequence into a circular
17 ** in-memory buffer; when the buffer fills, it wraps.
18 **
19 ** Functions are provided to set and/or re-configure the size of
20 ** the trace buffer, control what events are recorded in the
21 ** buffer, enable and disable tracing based on specific user
22 ** supplied data and other control functions. Methods are provided
23 ** to record the trace entries in the in-memory trace buffer to
24 ** a file.
25 **
26 ** Tracing may cause a performance degredation to the application
27 ** depending on the number and placement of calls to the tracing
28 ** facility. When tracing is compiled in and all tracing is
29 ** disabled via the runtime controls, the overhead should be
30 ** minimal. ... Famous last words, eh?
31 **
32 ** When DEBUG is defined at compile time, the Trace Facility is
33 ** compiled as part of NSPR and any application using NSPR's
34 ** header files will have tracing compiled in. When DEBUG is not
35 ** defined, the Trace Facility is not compiled into NSPR nor
36 ** exported in its header files. If the Trace Facility is
37 ** desired in a non-debug build, then FORCE_NSPR_TRACE may be
38 ** defined at compile time for both the optimized build of NSPR
39 ** and the application. NSPR and any application using NSPR's
40 ** Trace Facility must be compiled with the same level of trace
41 ** conditioning or unresolved references may be realized at link
42 ** time.
43 **
44 ** For any of the Trace Facility methods that requires a trace
45 ** handle as an input argument, the caller must ensure that the
46 ** trace handle argument is valid. An invalid trace handle
47 ** argument may cause unpredictable results.
48 **
49 ** Trace Facility methods are thread-safe and SMP safe.
50 **
51 ** Users of the Trace Facility should use the defined macros to
52 ** invoke trace methods, not the function calls directly. e.g.
53 ** PR_TRACE( h1,0,1,2, ...); not PR_Trace(h1,0,1,2, ...);
54 **
55 ** Application designers should be aware of the effects of
56 ** debug and optimized build differences when using result of the
57 ** Trace Facility macros in expressions.
58 **
59 ** See Also: prcountr.h
60 **
61 ** /lth. 08-Jun-1998.
62 */
63
64 #include "prtypes.h"
65 #include "prthread.h"
66 #include "prtime.h"
67
68 PR_BEGIN_EXTERN_C
69
70 /*
71 ** Opaque type for the trace handle
72 ** ... Don't even think about looking in here.
73 **
74 */
75 typedef void * PRTraceHandle;
76
77 /*
78 ** PRTraceEntry -- A trace entry in the in-memory trace buffer
79 ** looks like this.
80 **
81 */
82 typedef struct PRTraceEntry
83 {
84 PRThread *thread; /* The thread creating the trace entry */
85 PRTraceHandle handle; /* PRTraceHandle creating the trace entry */
86 PRTime time; /* Value of PR_Now() at time of trace entry */
87 PRUint32 userData[8]; /* user supplied trace data */
88 } PRTraceEntry;
89
90 /*
91 ** PRTraceOption -- command operands to
92 ** PR_[Set|Get]TraceOption(). See descriptive meanings there.
93 **
94 */
95 typedef enum PRTraceOption
96 {
97 PRTraceBufSize,
98 PRTraceEnable,
99 PRTraceDisable,
100 PRTraceSuspend,
101 PRTraceResume,
102 PRTraceSuspendRecording,
103 PRTraceResumeRecording,
104 PRTraceLockHandles,
105 PRTraceUnLockHandles,
106 PRTraceStopRecording
107 } PRTraceOption;
108
109 /* -----------------------------------------------------------------------
110 ** FUNCTION: PR_DEFINE_TRACE() -- Define a PRTraceHandle
111 **
112 ** DESCRIPTION: PR_DEFINE_TRACE() is used to define a trace
113 ** handle.
114 **
115 */
116 #define PR_DEFINE_TRACE(name) PRTraceHandle name
117
118 /* -----------------------------------------------------------------------
119 ** FUNCTION: PR_INIT_TRACE_HANDLE() -- Set the value of a PRTraceHandle
120 **
121 ** DESCRIPTION:
122 ** PR_INIT_TRACE_HANDLE() sets the value of a PRTraceHandle
123 ** to value. e.g. PR_INIT_TRACE_HANDLE( myHandle, NULL );
124 **
125 */
126 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
127 #define PR_INIT_TRACE_HANDLE(handle,value)\
128 (handle) = (PRCounterHandle)(value)
129 #else
130 #define PR_INIT_TRACE_HANDLE(handle,value)
131 #endif
132
133
134 /* -----------------------------------------------------------------------
135 ** FUNCTION: PR_CreateTrace() -- Create a trace handle
136 **
137 ** DESCRIPTION:
138 ** PR_CreateTrace() creates a new trace handle. Tracing is
139 ** enabled for this handle when it is created. The trace handle
140 ** is intended for use in other Trace Facility calls.
141 **
142 ** PR_CreateTrace() registers the QName, RName and description
143 ** data so that this data can be retrieved later.
144 **
145 ** INPUTS:
146 ** qName: pointer to string. QName for this trace handle.
147 **
148 ** rName: pointer to string. RName for this trace handle.
149 **
150 ** description: pointer to string. Descriptive data about this
151 ** trace handle.
152 **
153 ** OUTPUTS:
154 ** Creates the trace handle.
155 ** Registers the QName and RName with the trace facility.
156 **
157 ** RETURNS:
158 ** PRTraceHandle
159 **
160 ** RESTRICTIONS:
161 ** qName is limited to 31 characters.
162 ** rName is limited to 31 characters.
163 ** description is limited to 255 characters.
164 **
165 */
166 #define PRTRACE_NAME_MAX 31
167 #define PRTRACE_DESC_MAX 255
168
169 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
170 #define PR_CREATE_TRACE(handle,qName,rName,description)\
171 (handle) = PR_CreateTrace((qName),(rName),(description))
172 #else
173 #define PR_CREATE_TRACE(handle,qName,rName,description)
174 #endif
175
176 NSPR_API(PRTraceHandle)
177 PR_CreateTrace(
178 const char *qName, /* QName for this trace handle */
179 const char *rName, /* RName for this trace handle */
180 const char *description /* description for this trace handle */
181 );
182
183
184 /* -----------------------------------------------------------------------
185 ** FUNCTION: PR_DestroyTrace() -- Destroy a trace handle
186 **
187 ** DESCRIPTION:
188 ** PR_DestroyTrace() removes the referenced trace handle and
189 ** associated QName, RName and description data from the Trace
190 ** Facility.
191 **
192 ** INPUTS: handle. A PRTraceHandle
193 **
194 ** OUTPUTS:
195 ** The trace handle is unregistered.
196 ** The QName, RName and description are removed.
197 **
198 ** RETURNS: void
199 **
200 ** RESTRICTIONS:
201 **
202 */
203 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
204 #define PR_DESTROY_TRACE(handle)\
205 PR_DestroyTrace((handle))
206 #else
207 #define PR_DESTROY_TRACE(handle)
208 #endif
209
210 NSPR_API(void)
211 PR_DestroyTrace(
212 PRTraceHandle handle /* Handle to be destroyed */
213 );
214
215
216 /* -----------------------------------------------------------------------
217 ** FUNCTION: PR_Trace() -- Make a trace entry in the in-memory trace
218 **
219 ** DESCRIPTION:
220 ** PR_Trace() makes an entry in the in-memory trace buffer for
221 ** the referenced trace handle. The next logically available
222 ** PRTraceEntry is used; when the next trace entry would overflow
223 ** the trace table, the table wraps.
224 **
225 ** PR_Trace() for a specific trace handle may be disabled by
226 ** calling PR_SetTraceOption() specifying PRTraceDisable for the
227 ** trace handle to be disabled.
228 **
229 ** INPUTS:
230 ** handle: PRTraceHandle. The trace handle for this trace.
231 **
232 ** userData[0..7]: unsigned 32bit integers. user supplied data
233 ** that is copied into the PRTraceEntry
234 **
235 ** OUTPUTS:
236 ** A PRTraceEntry is (conditionally) formatted in the in-memory
237 ** trace buffer.
238 **
239 ** RETURNS: void.
240 **
241 ** RESTRICTIONS:
242 **
243 */
244 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
245 #define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)\
246 PR_Trace((handle),(ud0),(ud1),(ud2),(ud3),(ud4),(ud5),(ud6),(ud7))
247 #else
248 #define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)
249 #endif
250
251 NSPR_API(void)
252 PR_Trace(
253 PRTraceHandle handle, /* use this trace handle */
254 PRUint32 userData0, /* User supplied data word 0 */
255 PRUint32 userData1, /* User supplied data word 1 */
256 PRUint32 userData2, /* User supplied data word 2 */
257 PRUint32 userData3, /* User supplied data word 3 */
258 PRUint32 userData4, /* User supplied data word 4 */
259 PRUint32 userData5, /* User supplied data word 5 */
260 PRUint32 userData6, /* User supplied data word 6 */
261 PRUint32 userData7 /* User supplied data word 7 */
262 );
263
264 /* -----------------------------------------------------------------------
265 ** FUNCTION: PR_SetTraceOption() -- Control the Trace Facility
266 **
267 ** DESCRIPTION:
268 ** PR_SetTraceOption() controls the Trace Facility. Depending on
269 ** command and value, attributes of the Trace Facility may be
270 ** changed.
271 **
272 ** INPUTS:
273 ** command: An enumerated value in the set of PRTraceOption.
274 ** value: pointer to the data to be set. Type of the data is
275 ** dependent on command; for each value of command, the type
276 ** and meaning of dereferenced value is shown.
277 **
278 ** PRTraceBufSize: unsigned long: the size of the trace buffer,
279 ** in bytes.
280 **
281 ** PRTraceEnable: PRTraceHandle. The trace handle to be
282 ** enabled.
283 **
284 ** PRTraceDisable: PRTraceHandle. The trace handle to be
285 ** disabled.
286 **
287 ** PRTraceSuspend: void. value must be NULL. All tracing is
288 ** suspended.
289 **
290 ** PRTraceResume: void. value must be NULL. Tracing for all
291 ** previously enabled, prior to a PRTraceSuspend, is resumed.
292 **
293 ** PRTraceStopRecording: void. value must be NULL. If recording
294 ** (see: ** PR_RecordTraceEntries()) is being done,
295 ** PRTraceStopRecording causes PR_RecordTraceEntries() to return
296 ** to its caller. If recording is not being done, this function
297 ** has no effect.
298 **
299 ** PRTraceSuspendRecording: void. Must be NULL. If recording is
300 ** being done, PRTraceSuspendRecording causes further writes to
301 ** the trace file to be suspended. Data in the in-memory
302 ** trace buffer that would ordinarily be written to the
303 ** trace file will not be written. Trace entries will continue
304 ** to be entered in the in-memory buffer. If the Trace Facility
305 ** recording is already in a suspended state, the call has no
306 ** effect.
307 **
308 ** PRTraceResumeRecording: void. value must be NULL. If
309 ** recording for the Trace Facility has been previously been
310 ** suspended, this causes recording to resume. Recording resumes
311 ** with the next in-memory buffer segment that would be written
312 ** if trace recording had not been suspended. If recording is
313 ** not currently suspended, the call has no effect.
314 **
315 ** PRTraceLockHandles: void. value must be NULL. Locks the
316 ** trace handle lock. While the trace handle lock is held,
317 ** calls to PR_CreateTrace() will block until the lock is
318 ** released.
319 **
320 ** PRTraceUnlockHandles: void. value must be NULL. Unlocks the
321 ** trace handle lock.
322 **
323 ** OUTPUTS:
324 ** The operation of the Trace Facility may be changed.
325 **
326 ** RETURNS: void
327 **
328 ** RESTRICTIONS:
329 **
330 */
331 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
332 #define PR_SET_TRACE_OPTION(command,value)\
333 PR_SetTraceOption((command),(value))
334 #else
335 #define PR_SET_TRACE_OPTION(command,value)
336 #endif
337
338 NSPR_API(void)
339 PR_SetTraceOption(
340 PRTraceOption command, /* One of the enumerated values */
341 void *value /* command value or NULL */
342 );
343
344
345 /* -----------------------------------------------------------------------
346 ** FUNCTION: PR_GetTraceOption() -- Retrieve settings from the Trace Facility
347 **
348 ** DESCRIPTION:
349 ** PR_GetTraceOption() retrieves the current setting of the
350 ** Trace Facility control depending on command.
351 **
352 **
353 ** PRTraceBufSize: unsigned long: the size of the trace buffer,
354 ** in bytes.
355 **
356 **
357 ** INPUTS:
358 ** command: one of the enumerated values in PRTraceOptions
359 ** valid for PR_GetTraceOption().
360 **
361 ** OUTPUTS:
362 ** dependent on command.
363 **
364 ** RETURNS: void
365 **
366 ** RESTRICTIONS:
367 **
368 */
369 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
370 #define PR_GET_TRACE_OPTION(command,value)\
371 PR_GetTraceOption((command),(value))
372 #else
373 #define PR_GET_TRACE_OPTION(command,value)
374 #endif
375
376 NSPR_API(void)
377 PR_GetTraceOption(
378 PRTraceOption command, /* One of the enumerated values */
379 void *value /* command value or NULL */
380 );
381
382 /* -----------------------------------------------------------------------
383 ** FUNCTION: PR_GetTraceHandleFromName() -- Retrieve an existing
384 ** handle by name.
385 **
386 ** DESCRIPTION:
387 ** PR_GetTraceHandleFromName() retreives an existing tracehandle
388 ** using the name specified by qName and rName.
389 **
390 ** INPUTS:
391 ** qName: pointer to string. QName for this trace handle.
392 **
393 ** rName: pointer to string. RName for this trace handle.
394 **
395 **
396 ** OUTPUTS: returned.
397 **
398 ** RETURNS:
399 ** PRTraceHandle associated with qName and rName or NULL when
400 ** there is no match.
401 **
402 ** RESTRICTIONS:
403 **
404 */
405 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
406 #define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)\
407 (handle) = PR_GetTraceHandleFromName((qName),(rName))
408 #else
409 #define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)
410 #endif
411
412 NSPR_API(PRTraceHandle)
413 PR_GetTraceHandleFromName(
414 const char *qName, /* QName search argument */
415 const char *rName /* RName search argument */
416 );
417
418 /* -----------------------------------------------------------------------
419 ** FUNCTION: PR_GetTraceNameFromHandle() -- Retreive trace name
420 ** by bandle.
421 **
422 ** DESCRIPTION:
423 ** PR_GetTraceNameFromHandle() retreives the existing qName,
424 ** rName, and description for the referenced trace handle.
425 **
426 ** INPUTS: handle: PRTraceHandle.
427 **
428 ** OUTPUTS: pointers to the Trace Facility's copy of qName,
429 ** rName and description. ... Don't mess with these values.
430 ** They're mine.
431 **
432 ** RETURNS: void
433 **
434 ** RESTRICTIONS:
435 **
436 */
437 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
438 #define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)\
439 PR_GetTraceNameFromHandle((handle),(qName),(rName),(description))
440 #else
441 #define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)
442 #endif
443
444 NSPR_API(void)
445 PR_GetTraceNameFromHandle(
446 PRTraceHandle handle, /* handle as search argument */
447 const char **qName, /* pointer to associated QName */
448 const char **rName, /* pointer to associated RName */
449 const char **description /* pointer to associated description */
450 );
451
452 /* -----------------------------------------------------------------------
453 ** FUNCTION: PR_FindNextTraceQname() -- Retrieive a QName handle
454 ** iterator.
455 **
456 ** DESCRIPTION:
457 ** PR_FindNextTraceQname() retreives the first or next trace
458 ** QName handle, depending on the value of handle, from the trace
459 ** database. The PRTraceHandle returned can be used as an
460 ** iterator to traverse the QName handles in the Trace database.
461 **
462 ** INPUTS:
463 ** handle: When NULL, PR_FindNextQname() returns the first QName
464 ** handle. When a handle is a valid PRTraceHandle previously
465 ** retreived using PR_FindNextQname() the next QName handle is
466 ** retreived.
467 **
468 ** OUTPUTS: returned.
469 **
470 ** RETURNS:
471 ** PRTraceHandle or NULL when there are no trace handles.
472 **
473 ** RESTRICTIONS:
474 ** Iterating thru the trace handles via FindFirst/FindNext
475 ** should be done under protection of the trace handle lock.
476 ** See: PR_SetTraceOption( PRLockTraceHandles ).
477 **
478 */
479 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
480 #define PR_FIND_NEXT_TRACE_QNAME(next,handle)\
481 (next) = PR_FindNextTraceQname((handle))
482 #else
483 #define PR_FIND_NEXT_TRACE_QNAME(next,handle)
484 #endif
485
486 NSPR_API(PRTraceHandle)
487 PR_FindNextTraceQname(
488 PRTraceHandle handle
489 );
490
491
492 /* -----------------------------------------------------------------------
493 ** FUNCTION: PR_FindNextTraceRname() -- Retrieive an RName handle
494 ** iterator.
495 **
496 ** DESCRIPTION:
497 ** PR_FindNextTraceRname() retreives the first or next trace
498 ** RName handle, depending on the value of handle, from the trace
499 ** database. The PRTraceHandle returned can be used as an
500 ** iterator to traverse the RName handles in the Trace database.
501 **
502 ** INPUTS:
503 ** rhandle: When NULL, PR_FindNextRname() returns the first
504 ** RName handle. When a handle is a valid PRTraceHandle
505 ** previously retreived using PR_FindNextRname() the next RName
506 ** handle is retreived.
507 ** qhandle: A valid PRTraceHandle retruned from a previous call
508 ** to PR_FIND_NEXT_TRACE_QNAME().
509 **
510 ** OUTPUTS: returned.
511 **
512 ** RETURNS:
513 ** PRTraceHandle or NULL when there are no trace handles.
514 **
515 ** RESTRICTIONS:
516 ** Iterating thru the trace handles via FindNext should be done
517 ** under protection of the trace handle lock. See: (
518 ** PR_SetTraceOption( PRLockTraceHandles ).
519 **
520 */
521 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
522 #define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)\
523 (next) = PR_FindNextTraceRname((rhandle),(qhandle))
524 #else
525 #define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)
526 #endif
527
528 NSPR_API(PRTraceHandle)
529 PR_FindNextTraceRname(
530 PRTraceHandle rhandle,
531 PRTraceHandle qhandle
532 );
533
534 /* -----------------------------------------------------------------------
535 ** FUNCTION: PR_RecordTraceEntries() -- Write trace entries to external media
536 **
537 ** DESCRIPTION:
538 ** PR_RecordTraceEntries() causes entries in the in-memory trace
539 ** buffer to be written to external media.
540 **
541 ** When PR_RecordTraceEntries() is called from an application
542 ** thread, the function appears to block until another thread
543 ** calls PR_SetTraceOption() with the PRTraceStopRecording
544 ** option. This suggests that PR_RecordTraceEntries() should be
545 ** called from a user supplied thread whose only job is to
546 ** record trace entries.
547 **
548 ** The environment variable NSPR_TRACE_LOG controls the operation
549 ** of this function. When NSPR_TRACE_LOG is not defined in the
550 ** environment, no recording of trace entries occurs. When
551 ** NSPR_TRACE_LOG is defined, the value of its definition must be
552 ** the filename of the file to receive the trace entry buffer.
553 **
554 ** PR_RecordTraceEntries() attempts to record the in-memory
555 ** buffer to a file, subject to the setting of the environment
556 ** variable NSPR_TRACE_LOG. It is possible because of system
557 ** load, the thread priority of the recording thread, number of
558 ** active trace records being written over time, and other
559 ** variables that some trace records can be lost. ... In other
560 ** words: don't bet the farm on getting everything.
561 **
562 ** INPUTS: none
563 **
564 ** OUTPUTS: none
565 **
566 ** RETURNS: PR_STATUS
567 ** PR_SUCCESS no errors were found.
568 ** PR_FAILURE errors were found.
569 **
570 ** RESTRICTIONS:
571 ** Only one thread can call PR_RecordTraceEntries() within a
572 ** process.
573 **
574 ** On error, PR_RecordTraceEntries() may return prematurely.
575 **
576 */
577 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
578 #define PR_RECORD_TRACE_ENTRIES()\
579 PR_RecordTraceEntries()
580 #else
581 #define PR_RECORD_TRACE_ENTRIES()
582 #endif
583
584 NSPR_API(void)
585 PR_RecordTraceEntries(
586 void
587 );
588
589 /* -----------------------------------------------------------------------
590 ** FUNCTION: PR_GetTraceEntries() -- Retreive trace entries from
591 ** the Trace Facility
592 **
593 ** DESCRIPTION:
594 ** PR_GetTraceEntries() retreives trace entries from the Trace
595 ** Facility. Up to count trace entries are copied from the Trace
596 ** Facility into buffer. Only those trace entries that have not
597 ** been copied via a previous call to PR_GetTraceEntries() are
598 ** copied. The actual number copied is placed in the PRInt32
599 ** variable pointed to by found.
600 **
601 ** If more than count trace entries have entered the Trace
602 ** Facility since the last call to PR_GetTraceEntries()
603 ** a lost data condition is returned. In this case, the most
604 ** recent count trace entries are copied into buffer and found is
605 ** set to count.
606 **
607 ** INPUTS:
608 ** count. The number of trace entries to be copied into buffer.
609 **
610 **
611 ** OUTPUTS:
612 ** buffer. An array of PRTraceEntries. The buffer is supplied
613 ** by the caller.
614 **
615 ** found: 32bit signed integer. The number of PRTraceEntries
616 ** actually copied. found is always less than or equal to count.
617 **
618 ** RETURNS:
619 ** zero when there is no lost data.
620 ** non-zero when some PRTraceEntries have been lost.
621 **
622 ** RESTRICTIONS:
623 ** This is a real performance pig. The copy out operation is bad
624 ** enough, but depending on then frequency of calls to the
625 ** function, serious performance impact to the operating
626 ** application may be realized. ... YMMV.
627 **
628 */
629 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
630 #define PR_GET_TRACE_ENTRIES(buffer,count,found)\
631 PR_GetTraceEntries((buffer),(count),(found))
632 #else
633 #define PR_GET_TRACE_ENTRIES(buffer,count,found)
634 #endif
635
636 NSPR_API(PRIntn)
637 PR_GetTraceEntries(
638 PRTraceEntry *buffer, /* where to write output */
639 PRInt32 count, /* number to get */
640 PRInt32 *found /* number you got */
641 );
642
643 PR_END_EXTERN_C
644
645 #endif /* prtrace_h___ */
646

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