Mercurial > hg > truffle
comparison src/os/solaris/vm/attachListener_solaris.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | e392695de029 |
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1 /* | |
2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_attachListener_solaris.cpp.incl" | |
27 | |
28 #include <door.h> | |
29 #include <string.h> | |
30 #include <signal.h> | |
31 #include <sys/types.h> | |
32 #include <sys/socket.h> | |
33 #include <sys/stat.h> | |
34 | |
35 // stropts.h uses STR in stream ioctl defines | |
36 #undef STR | |
37 #include <stropts.h> | |
38 #undef STR | |
39 #define STR(a) #a | |
40 | |
41 // The attach mechanism on Solaris is implemented using the Doors IPC | |
42 // mechanism. The first tool to attempt to attach causes the attach | |
43 // listener thread to startup. This thread creats a door that is | |
44 // associated with a function that enqueues an operation to the attach | |
45 // listener. The door is attached to a file in the file system so that | |
46 // client (tools) can locate it. To enqueue an operation to the VM the | |
47 // client calls through the door which invokes the enqueue function in | |
48 // this process. The credentials of the client are checked and if the | |
49 // effective uid matches this process then the operation is enqueued. | |
50 // When an operation completes the attach listener is required to send the | |
51 // operation result and any result data to the client. In this implementation | |
52 // the result is returned via a UNIX domain socket. A pair of connected | |
53 // sockets (socketpair) is created in the enqueue function and the file | |
54 // descriptor for one of the sockets is returned to the client as the | |
55 // return from the door call. The other end is retained in this process. | |
56 // When the operation completes the result is sent to the client and | |
57 // the socket is closed. | |
58 | |
59 // forward reference | |
60 class SolarisAttachOperation; | |
61 | |
62 class SolarisAttachListener: AllStatic { | |
63 private: | |
64 | |
65 // the path to which we attach the door file descriptor | |
66 static char _door_path[PATH_MAX+1]; | |
67 static volatile bool _has_door_path; | |
68 | |
69 // door descriptor returned by door_create | |
70 static int _door_descriptor; | |
71 | |
72 static void set_door_path(char* path) { | |
73 if (path == NULL) { | |
74 _has_door_path = false; | |
75 } else { | |
76 strncpy(_door_path, path, PATH_MAX); | |
77 _door_path[PATH_MAX] = '\0'; // ensure it's nul terminated | |
78 _has_door_path = true; | |
79 } | |
80 } | |
81 | |
82 static void set_door_descriptor(int dd) { _door_descriptor = dd; } | |
83 | |
84 // mutex to protect operation list | |
85 static mutex_t _mutex; | |
86 | |
87 // semaphore to wakeup listener thread | |
88 static sema_t _wakeup; | |
89 | |
90 static mutex_t* mutex() { return &_mutex; } | |
91 static sema_t* wakeup() { return &_wakeup; } | |
92 | |
93 // enqueued operation list | |
94 static SolarisAttachOperation* _head; | |
95 static SolarisAttachOperation* _tail; | |
96 | |
97 static SolarisAttachOperation* head() { return _head; } | |
98 static void set_head(SolarisAttachOperation* head) { _head = head; } | |
99 | |
100 static SolarisAttachOperation* tail() { return _tail; } | |
101 static void set_tail(SolarisAttachOperation* tail) { _tail = tail; } | |
102 | |
103 // create the door | |
104 static int create_door(); | |
105 | |
106 public: | |
107 enum { | |
108 ATTACH_PROTOCOL_VER = 1 // protocol version | |
109 }; | |
110 enum { | |
111 ATTACH_ERROR_BADREQUEST = 100, // error code returned by | |
112 ATTACH_ERROR_BADVERSION = 101, // the door call | |
113 ATTACH_ERROR_RESOURCE = 102, | |
114 ATTACH_ERROR_INTERNAL = 103, | |
115 ATTACH_ERROR_DENIED = 104 | |
116 }; | |
117 | |
118 // initialize the listener | |
119 static int init(); | |
120 | |
121 static bool has_door_path() { return _has_door_path; } | |
122 static char* door_path() { return _door_path; } | |
123 static int door_descriptor() { return _door_descriptor; } | |
124 | |
125 // enqueue an operation | |
126 static void enqueue(SolarisAttachOperation* op); | |
127 | |
128 // dequeue an operation | |
129 static SolarisAttachOperation* dequeue(); | |
130 }; | |
131 | |
132 | |
133 // SolarisAttachOperation is an AttachOperation that additionally encapsulates | |
134 // a socket connection to the requesting client/tool. SolarisAttachOperation | |
135 // can additionally be held in a linked list. | |
136 | |
137 class SolarisAttachOperation: public AttachOperation { | |
138 private: | |
139 friend class SolarisAttachListener; | |
140 | |
141 // connection to client | |
142 int _socket; | |
143 | |
144 // linked list support | |
145 SolarisAttachOperation* _next; | |
146 | |
147 SolarisAttachOperation* next() { return _next; } | |
148 void set_next(SolarisAttachOperation* next) { _next = next; } | |
149 | |
150 public: | |
151 void complete(jint res, bufferedStream* st); | |
152 | |
153 int socket() const { return _socket; } | |
154 void set_socket(int s) { _socket = s; } | |
155 | |
156 SolarisAttachOperation(char* name) : AttachOperation(name) { | |
157 set_socket(-1); | |
158 set_next(NULL); | |
159 } | |
160 }; | |
161 | |
162 // statics | |
163 char SolarisAttachListener::_door_path[PATH_MAX+1]; | |
164 volatile bool SolarisAttachListener::_has_door_path; | |
165 int SolarisAttachListener::_door_descriptor = -1; | |
166 mutex_t SolarisAttachListener::_mutex; | |
167 sema_t SolarisAttachListener::_wakeup; | |
168 SolarisAttachOperation* SolarisAttachListener::_head = NULL; | |
169 SolarisAttachOperation* SolarisAttachListener::_tail = NULL; | |
170 | |
171 // Supporting class to help split a buffer into individual components | |
172 class ArgumentIterator : public StackObj { | |
173 private: | |
174 char* _pos; | |
175 char* _end; | |
176 public: | |
177 ArgumentIterator(char* arg_buffer, size_t arg_size) { | |
178 _pos = arg_buffer; | |
179 _end = _pos + arg_size - 1; | |
180 } | |
181 char* next() { | |
182 if (*_pos == '\0') { | |
183 return NULL; | |
184 } | |
185 char* res = _pos; | |
186 char* next_pos = strchr(_pos, '\0'); | |
187 if (next_pos < _end) { | |
188 next_pos++; | |
189 } | |
190 _pos = next_pos; | |
191 return res; | |
192 } | |
193 }; | |
194 | |
195 // Calls from the door function to check that the client credentials | |
196 // match this process. Returns 0 if credentials okay, otherwise -1. | |
197 static int check_credentials() { | |
198 door_cred_t cred_info; | |
199 | |
200 // get client credentials | |
201 if (door_cred(&cred_info) == -1) { | |
202 return -1; // unable to get them | |
203 } | |
204 | |
205 // get our euid/eguid (probably could cache these) | |
206 uid_t euid = geteuid(); | |
207 gid_t egid = getegid(); | |
208 | |
209 // check that the effective uid/gid matches - discuss this with Jeff. | |
210 if (cred_info.dc_euid == euid && cred_info.dc_egid == egid) { | |
211 return 0; // okay | |
212 } else { | |
213 return -1; // denied | |
214 } | |
215 } | |
216 | |
217 | |
218 // Parses the argument buffer to create an AttachOperation that we should | |
219 // enqueue to the attach listener. | |
220 // The buffer is expected to be formatted as follows: | |
221 // <ver>0<cmd>0<arg>0<arg>0<arg>0 | |
222 // where <ver> is the version number (must be "1"), <cmd> is the command | |
223 // name ("load, "datadump", ...) and <arg> is an argument. | |
224 // | |
225 static SolarisAttachOperation* create_operation(char* argp, size_t arg_size, int* err) { | |
226 // assume bad request until parsed | |
227 *err = SolarisAttachListener::ATTACH_ERROR_BADREQUEST; | |
228 | |
229 if (arg_size < 2 || argp[arg_size-1] != '\0') { | |
230 return NULL; // no ver or not null terminated | |
231 } | |
232 | |
233 // Use supporting class to iterate over the buffer | |
234 ArgumentIterator args(argp, arg_size); | |
235 | |
236 // First check the protocol version | |
237 char* ver = args.next(); | |
238 if (ver == NULL) { | |
239 return NULL; | |
240 } | |
241 if (atoi(ver) != SolarisAttachListener::ATTACH_PROTOCOL_VER) { | |
242 *err = SolarisAttachListener::ATTACH_ERROR_BADVERSION; | |
243 return NULL; | |
244 } | |
245 | |
246 // Get command name and create the operation | |
247 char* name = args.next(); | |
248 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { | |
249 return NULL; | |
250 } | |
251 SolarisAttachOperation* op = new SolarisAttachOperation(name); | |
252 | |
253 // Iterate over the arguments | |
254 for (int i=0; i<AttachOperation::arg_count_max; i++) { | |
255 char* arg = args.next(); | |
256 if (arg == NULL) { | |
257 op->set_arg(i, NULL); | |
258 } else { | |
259 if (strlen(arg) > AttachOperation::arg_length_max) { | |
260 delete op; | |
261 return NULL; | |
262 } | |
263 op->set_arg(i, arg); | |
264 } | |
265 } | |
266 | |
267 // return operation | |
268 *err = 0; | |
269 return op; | |
270 } | |
271 | |
272 // create special operation to indicate all clients have detached | |
273 static SolarisAttachOperation* create_detachall_operation() { | |
274 return new SolarisAttachOperation(AttachOperation::detachall_operation_name()); | |
275 } | |
276 | |
277 // This is door function which the client executes via a door_call. | |
278 extern "C" { | |
279 static void enqueue_proc(void* cookie, char* argp, size_t arg_size, | |
280 door_desc_t* dt, uint_t n_desc) | |
281 { | |
282 int return_fd = -1; | |
283 SolarisAttachOperation* op = NULL; | |
284 | |
285 // no listener | |
286 jint res = 0; | |
287 if (!AttachListener::is_initialized()) { | |
288 // how did we get here? | |
289 debug_only(warning("door_call when not enabled")); | |
290 res = (jint)SolarisAttachListener::ATTACH_ERROR_INTERNAL; | |
291 } | |
292 | |
293 // check client credentials | |
294 if (res == 0) { | |
295 if (check_credentials() != 0) { | |
296 res = (jint)SolarisAttachListener::ATTACH_ERROR_DENIED; | |
297 } | |
298 } | |
299 | |
300 // if we are stopped at ShowMessageBoxOnError then maybe we can | |
301 // load a diagnostic library | |
302 if (res == 0 && is_error_reported()) { | |
303 if (ShowMessageBoxOnError) { | |
304 // TBD - support loading of diagnostic library here | |
305 } | |
306 | |
307 // can't enqueue operation after fatal error | |
308 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; | |
309 } | |
310 | |
311 // create the operation | |
312 if (res == 0) { | |
313 int err; | |
314 op = create_operation(argp, arg_size, &err); | |
315 res = (op == NULL) ? (jint)err : 0; | |
316 } | |
317 | |
318 // create a pair of connected sockets. Store the file descriptor | |
319 // for one end in the operation and enqueue the operation. The | |
320 // file descriptor for the other end wil be returned to the client. | |
321 if (res == 0) { | |
322 int s[2]; | |
323 if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0) { | |
324 delete op; | |
325 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; | |
326 } else { | |
327 op->set_socket(s[0]); | |
328 return_fd = s[1]; | |
329 SolarisAttachListener::enqueue(op); | |
330 } | |
331 } | |
332 | |
333 // Return 0 (success) + file descriptor, or non-0 (error) | |
334 if (res == 0) { | |
335 door_desc_t desc; | |
336 desc.d_attributes = DOOR_DESCRIPTOR; | |
337 desc.d_data.d_desc.d_descriptor = return_fd; | |
338 door_return((char*)&res, sizeof(res), &desc, 1); | |
339 } else { | |
340 door_return((char*)&res, sizeof(res), NULL, 0); | |
341 } | |
342 } | |
343 } | |
344 | |
345 // atexit hook to detach the door and remove the file | |
346 extern "C" { | |
347 static void listener_cleanup() { | |
348 static int cleanup_done; | |
349 if (!cleanup_done) { | |
350 cleanup_done = 1; | |
351 int dd = SolarisAttachListener::door_descriptor(); | |
352 if (dd >= 0) { | |
353 ::close(dd); | |
354 } | |
355 if (SolarisAttachListener::has_door_path()) { | |
356 char* path = SolarisAttachListener::door_path(); | |
357 ::fdetach(path); | |
358 ::unlink(path); | |
359 } | |
360 } | |
361 } | |
362 } | |
363 | |
364 // Create the door | |
365 int SolarisAttachListener::create_door() { | |
366 char door_path[PATH_MAX+1]; | |
367 int fd, res; | |
368 | |
369 // register exit function | |
370 ::atexit(listener_cleanup); | |
371 | |
372 // create the door descriptor | |
373 int dd = ::door_create(enqueue_proc, NULL, 0); | |
374 if (dd < 0) { | |
375 return -1; | |
376 } | |
377 | |
378 sprintf(door_path, "%s/.java_pid%d", os::get_temp_directory(), os::current_process_id()); | |
379 RESTARTABLE(::creat(door_path, S_IRUSR | S_IWUSR), fd); | |
380 | |
381 if (fd == -1) { | |
382 debug_only(warning("attempt to create %s failed", door_path)); | |
383 return -1; | |
384 } | |
385 assert(fd >= 0, "bad file descriptor"); | |
386 set_door_path(door_path); | |
387 RESTARTABLE(::close(fd), res); | |
388 | |
389 // attach the door descriptor to the file | |
390 if ((res = ::fattach(dd, door_path)) == -1) { | |
391 // if busy then detach and try again | |
392 if (errno == EBUSY) { | |
393 ::fdetach(door_path); | |
394 res = ::fattach(dd, door_path); | |
395 } | |
396 if (res == -1) { | |
397 ::door_revoke(dd); | |
398 dd = -1; | |
399 } | |
400 } | |
401 if (dd >= 0) { | |
402 set_door_descriptor(dd); | |
403 } else { | |
404 // unable to create door or attach it to the file | |
405 ::unlink(door_path); | |
406 set_door_path(NULL); | |
407 return -1; | |
408 } | |
409 | |
410 return 0; | |
411 } | |
412 | |
413 // Initialization - create the door, locks, and other initialization | |
414 int SolarisAttachListener::init() { | |
415 if (create_door()) { | |
416 return -1; | |
417 } | |
418 | |
419 int status = os::Solaris::mutex_init(&_mutex); | |
420 assert_status(status==0, status, "mutex_init"); | |
421 | |
422 status = ::sema_init(&_wakeup, 0, NULL, NULL); | |
423 assert_status(status==0, status, "sema_init"); | |
424 | |
425 set_head(NULL); | |
426 set_tail(NULL); | |
427 | |
428 return 0; | |
429 } | |
430 | |
431 // Dequeue an operation | |
432 SolarisAttachOperation* SolarisAttachListener::dequeue() { | |
433 for (;;) { | |
434 int res; | |
435 | |
436 // wait for somebody to enqueue something | |
437 while ((res = ::sema_wait(wakeup())) == EINTR) | |
438 ; | |
439 if (res) { | |
440 warning("sema_wait failed: %s", strerror(res)); | |
441 return NULL; | |
442 } | |
443 | |
444 // lock the list | |
445 res = os::Solaris::mutex_lock(mutex()); | |
446 assert(res == 0, "mutex_lock failed"); | |
447 | |
448 // remove the head of the list | |
449 SolarisAttachOperation* op = head(); | |
450 if (op != NULL) { | |
451 set_head(op->next()); | |
452 if (head() == NULL) { | |
453 set_tail(NULL); | |
454 } | |
455 } | |
456 | |
457 // unlock | |
458 os::Solaris::mutex_unlock(mutex()); | |
459 | |
460 // if we got an operation when return it. | |
461 if (op != NULL) { | |
462 return op; | |
463 } | |
464 } | |
465 } | |
466 | |
467 // Enqueue an operation | |
468 void SolarisAttachListener::enqueue(SolarisAttachOperation* op) { | |
469 // lock list | |
470 int res = os::Solaris::mutex_lock(mutex()); | |
471 assert(res == 0, "mutex_lock failed"); | |
472 | |
473 // enqueue at tail | |
474 op->set_next(NULL); | |
475 if (head() == NULL) { | |
476 set_head(op); | |
477 } else { | |
478 tail()->set_next(op); | |
479 } | |
480 set_tail(op); | |
481 | |
482 // wakeup the attach listener | |
483 RESTARTABLE(::sema_post(wakeup()), res); | |
484 assert(res == 0, "sema_post failed"); | |
485 | |
486 // unlock | |
487 os::Solaris::mutex_unlock(mutex()); | |
488 } | |
489 | |
490 | |
491 // support function - writes the (entire) buffer to a socket | |
492 static int write_fully(int s, char* buf, int len) { | |
493 do { | |
494 int n = ::write(s, buf, len); | |
495 if (n == -1) { | |
496 if (errno != EINTR) return -1; | |
497 } else { | |
498 buf += n; | |
499 len -= n; | |
500 } | |
501 } | |
502 while (len > 0); | |
503 return 0; | |
504 } | |
505 | |
506 // Complete an operation by sending the operation result and any result | |
507 // output to the client. At this time the socket is in blocking mode so | |
508 // potentially we can block if there is a lot of data and the client is | |
509 // non-responsive. For most operations this is a non-issue because the | |
510 // default send buffer is sufficient to buffer everything. In the future | |
511 // if there are operations that involves a very big reply then it the | |
512 // socket could be made non-blocking and a timeout could be used. | |
513 | |
514 void SolarisAttachOperation::complete(jint res, bufferedStream* st) { | |
515 if (this->socket() >= 0) { | |
516 JavaThread* thread = JavaThread::current(); | |
517 ThreadBlockInVM tbivm(thread); | |
518 | |
519 thread->set_suspend_equivalent(); | |
520 // cleared by handle_special_suspend_equivalent_condition() or | |
521 // java_suspend_self() via check_and_wait_while_suspended() | |
522 | |
523 // write operation result | |
524 char msg[32]; | |
525 sprintf(msg, "%d\n", res); | |
526 int rc = write_fully(this->socket(), msg, strlen(msg)); | |
527 | |
528 // write any result data | |
529 if (rc == 0) { | |
530 write_fully(this->socket(), (char*) st->base(), st->size()); | |
531 ::shutdown(this->socket(), 2); | |
532 } | |
533 | |
534 // close socket and we're done | |
535 RESTARTABLE(::close(this->socket()), rc); | |
536 | |
537 // were we externally suspended while we were waiting? | |
538 thread->check_and_wait_while_suspended(); | |
539 } | |
540 delete this; | |
541 } | |
542 | |
543 | |
544 // AttachListener functions | |
545 | |
546 AttachOperation* AttachListener::dequeue() { | |
547 JavaThread* thread = JavaThread::current(); | |
548 ThreadBlockInVM tbivm(thread); | |
549 | |
550 thread->set_suspend_equivalent(); | |
551 // cleared by handle_special_suspend_equivalent_condition() or | |
552 // java_suspend_self() via check_and_wait_while_suspended() | |
553 | |
554 AttachOperation* op = SolarisAttachListener::dequeue(); | |
555 | |
556 // were we externally suspended while we were waiting? | |
557 thread->check_and_wait_while_suspended(); | |
558 | |
559 return op; | |
560 } | |
561 | |
562 int AttachListener::pd_init() { | |
563 JavaThread* thread = JavaThread::current(); | |
564 ThreadBlockInVM tbivm(thread); | |
565 | |
566 thread->set_suspend_equivalent(); | |
567 // cleared by handle_special_suspend_equivalent_condition() or | |
568 // java_suspend_self() | |
569 | |
570 int ret_code = SolarisAttachListener::init(); | |
571 | |
572 // were we externally suspended while we were waiting? | |
573 thread->check_and_wait_while_suspended(); | |
574 | |
575 return ret_code; | |
576 } | |
577 | |
578 // Attach Listener is started lazily except in the case when | |
579 // +ReduseSignalUsage is used | |
580 bool AttachListener::init_at_startup() { | |
581 if (ReduceSignalUsage) { | |
582 return true; | |
583 } else { | |
584 return false; | |
585 } | |
586 } | |
587 | |
588 // If the file .attach_pid<pid> exists in the working directory | |
589 // or /tmp then this is the trigger to start the attach mechanism | |
590 bool AttachListener::is_init_trigger() { | |
591 if (init_at_startup() || is_initialized()) { | |
592 return false; // initialized at startup or already initialized | |
593 } | |
594 char fn[32]; | |
595 sprintf(fn, ".attach_pid%d", os::current_process_id()); | |
596 int ret; | |
597 struct stat64 st; | |
598 RESTARTABLE(::stat64(fn, &st), ret); | |
599 if (ret == -1) { | |
600 sprintf(fn, "/tmp/.attach_pid%d", os::current_process_id()); | |
601 RESTARTABLE(::stat64(fn, &st), ret); | |
602 } | |
603 if (ret == 0) { | |
604 // simple check to avoid starting the attach mechanism when | |
605 // a bogus user creates the file | |
606 if (st.st_uid == geteuid()) { | |
607 init(); | |
608 return true; | |
609 } | |
610 } | |
611 return false; | |
612 } | |
613 | |
614 // if VM aborts then detach/cleanup | |
615 void AttachListener::abort() { | |
616 listener_cleanup(); | |
617 } | |
618 | |
619 void AttachListener::pd_data_dump() { | |
620 os::signal_notify(SIGQUIT); | |
621 } | |
622 | |
623 static jint enable_dprobes(AttachOperation* op, outputStream* out) { | |
624 const char* probe = op->arg(0); | |
625 if (probe == NULL || probe[0] == '\0') { | |
626 out->print_cr("No probe specified"); | |
627 return JNI_ERR; | |
628 } else { | |
629 int probe_typess = atoi(probe); | |
630 if (errno) { | |
631 out->print_cr("invalid probe type"); | |
632 return JNI_ERR; | |
633 } else { | |
634 DTrace::enable_dprobes(probe_typess); | |
635 return JNI_OK; | |
636 } | |
637 } | |
638 } | |
639 | |
640 // platform specific operations table | |
641 static AttachOperationFunctionInfo funcs[] = { | |
642 { "enabledprobes", enable_dprobes }, | |
643 { NULL, NULL } | |
644 }; | |
645 | |
646 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* name) { | |
647 int i; | |
648 for (i = 0; funcs[i].name != NULL; i++) { | |
649 if (strcmp(funcs[i].name, name) == 0) { | |
650 return &funcs[i]; | |
651 } | |
652 } | |
653 return NULL; | |
654 } | |
655 | |
656 // Solaris specific global flag set. Currently, we support only | |
657 // changing ExtendedDTraceProbes flag. | |
658 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { | |
659 const char* name = op->arg(0); | |
660 assert(name != NULL, "flag name should not be null"); | |
661 bool flag = true; | |
662 const char* arg1; | |
663 if ((arg1 = op->arg(1)) != NULL) { | |
664 flag = (atoi(arg1) != 0); | |
665 if (errno) { | |
666 out->print_cr("flag value has to be an integer"); | |
667 return JNI_ERR; | |
668 } | |
669 } | |
670 | |
671 if (strcmp(name, "ExtendedDTraceProbes") != 0) { | |
672 out->print_cr("flag '%s' cannot be changed", name); | |
673 return JNI_ERR; | |
674 } | |
675 | |
676 DTrace::set_extended_dprobes(flag); | |
677 return JNI_OK; | |
678 } | |
679 | |
680 void AttachListener::pd_detachall() { | |
681 DTrace::detach_all_clients(); | |
682 } |