1 /* 2 * Copyright (c) 2005, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "logging/log.hpp" 27 #include "runtime/interfaceSupport.inline.hpp" 28 #include "runtime/os.inline.hpp" 29 #include "services/attachListener.hpp" 30 #include "services/dtraceAttacher.hpp" 31 #include "utilities/vmError.hpp" 32 33 #include <door.h> 34 #include <limits.h> 35 #include <string.h> 36 #include <signal.h> 37 #include <sys/types.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 41 // stropts.h uses STR in stream ioctl defines 42 #undef STR 43 #include <stropts.h> 44 #undef STR 45 #define STR(a) #a 46 47 // The attach mechanism on Solaris is implemented using the Doors IPC 48 // mechanism. The first tool to attempt to attach causes the attach 49 // listener thread to startup. This thread creats a door that is 50 // associated with a function that enqueues an operation to the attach 51 // listener. The door is attached to a file in the file system so that 52 // client (tools) can locate it. To enqueue an operation to the VM the 53 // client calls through the door which invokes the enqueue function in 54 // this process. The credentials of the client are checked and if the 55 // effective uid matches this process then the operation is enqueued. 56 // When an operation completes the attach listener is required to send the 57 // operation result and any result data to the client. In this implementation 58 // the result is returned via a UNIX domain socket. A pair of connected 59 // sockets (socketpair) is created in the enqueue function and the file 60 // descriptor for one of the sockets is returned to the client as the 61 // return from the door call. The other end is retained in this process. 62 // When the operation completes the result is sent to the client and 63 // the socket is closed. 64 65 // forward reference 66 class SolarisAttachOperation; 67 68 class SolarisAttachListener: AllStatic { 69 private: 70 71 // the path to which we attach the door file descriptor 72 static char _door_path[PATH_MAX+1]; 73 static volatile bool _has_door_path; 74 75 // door descriptor returned by door_create 76 static int _door_descriptor; 77 78 static bool _atexit_registered; 79 80 // mutex to protect operation list 81 static mutex_t _mutex; 82 83 // semaphore to wakeup listener thread 84 static sema_t _wakeup; 85 86 static mutex_t* mutex() { return &_mutex; } 87 static sema_t* wakeup() { return &_wakeup; } 88 89 // enqueued operation list 90 static SolarisAttachOperation* _head; 91 static SolarisAttachOperation* _tail; 92 93 static SolarisAttachOperation* head() { return _head; } 94 static void set_head(SolarisAttachOperation* head) { _head = head; } 95 96 static SolarisAttachOperation* tail() { return _tail; } 97 static void set_tail(SolarisAttachOperation* tail) { _tail = tail; } 98 99 // create the door 100 static int create_door(); 101 102 public: 103 enum { 104 ATTACH_PROTOCOL_VER = 1 // protocol version 105 }; 106 enum { 107 ATTACH_ERROR_BADREQUEST = 100, // error code returned by 108 ATTACH_ERROR_BADVERSION = 101, // the door call 109 ATTACH_ERROR_RESOURCE = 102, 110 ATTACH_ERROR_INTERNAL = 103, 111 ATTACH_ERROR_DENIED = 104 112 }; 113 114 static void set_door_path(char* path) { 115 if (path == NULL) { 116 _door_path[0] = '\0'; 117 _has_door_path = false; 118 } else { 119 strncpy(_door_path, path, PATH_MAX); 120 _door_path[PATH_MAX] = '\0'; // ensure it's nul terminated 121 _has_door_path = true; 122 } 123 } 124 125 static void set_door_descriptor(int dd) { _door_descriptor = dd; } 126 127 // initialize the listener 128 static int init(); 129 130 static bool has_door_path() { return _has_door_path; } 131 static char* door_path() { return _door_path; } 132 static int door_descriptor() { return _door_descriptor; } 133 134 // enqueue an operation 135 static void enqueue(SolarisAttachOperation* op); 136 137 // dequeue an operation 138 static SolarisAttachOperation* dequeue(); 139 }; 140 141 142 // SolarisAttachOperation is an AttachOperation that additionally encapsulates 143 // a socket connection to the requesting client/tool. SolarisAttachOperation 144 // can additionally be held in a linked list. 145 146 class SolarisAttachOperation: public AttachOperation { 147 private: 148 friend class SolarisAttachListener; 149 150 // connection to client 151 int _socket; 152 153 // linked list support 154 SolarisAttachOperation* _next; 155 156 SolarisAttachOperation* next() { return _next; } 157 void set_next(SolarisAttachOperation* next) { _next = next; } 158 159 public: 160 void complete(jint res, bufferedStream* st); 161 162 int socket() const { return _socket; } 163 void set_socket(int s) { _socket = s; } 164 165 SolarisAttachOperation(char* name) : AttachOperation(name) { 166 set_socket(-1); 167 set_next(NULL); 168 } 169 }; 170 171 // statics 172 char SolarisAttachListener::_door_path[PATH_MAX+1]; 173 volatile bool SolarisAttachListener::_has_door_path; 174 int SolarisAttachListener::_door_descriptor = -1; 175 bool SolarisAttachListener::_atexit_registered = false; 176 mutex_t SolarisAttachListener::_mutex; 177 sema_t SolarisAttachListener::_wakeup; 178 SolarisAttachOperation* SolarisAttachListener::_head = NULL; 179 SolarisAttachOperation* SolarisAttachListener::_tail = NULL; 180 181 // Supporting class to help split a buffer into individual components 182 class ArgumentIterator : public StackObj { 183 private: 184 char* _pos; 185 char* _end; 186 public: 187 ArgumentIterator(char* arg_buffer, size_t arg_size) { 188 _pos = arg_buffer; 189 _end = _pos + arg_size - 1; 190 } 191 char* next() { 192 if (*_pos == '\0') { 193 // advance the iterator if possible (null arguments) 194 if (_pos < _end) { 195 _pos += 1; 196 } 197 return NULL; 198 } 199 char* res = _pos; 200 char* next_pos = strchr(_pos, '\0'); 201 if (next_pos < _end) { 202 next_pos++; 203 } 204 _pos = next_pos; 205 return res; 206 } 207 }; 208 209 // Calls from the door function to check that the client credentials 210 // match this process. Returns 0 if credentials okay, otherwise -1. 211 static int check_credentials() { 212 ucred_t *cred_info = NULL; 213 int ret = -1; // deny by default 214 215 // get client credentials 216 if (door_ucred(&cred_info) == -1) { 217 return -1; // unable to get them, deny 218 } 219 220 // get euid/egid from ucred_free 221 uid_t ucred_euid = ucred_geteuid(cred_info); 222 gid_t ucred_egid = ucred_getegid(cred_info); 223 224 // check that the effective uid/gid matches 225 if (os::Posix::matches_effective_uid_and_gid_or_root(ucred_euid, ucred_egid)) { 226 ret = 0; // allow 227 } 228 229 ucred_free(cred_info); 230 return ret; 231 } 232 233 234 // Parses the argument buffer to create an AttachOperation that we should 235 // enqueue to the attach listener. 236 // The buffer is expected to be formatted as follows: 237 // <ver>0<cmd>0<arg>0<arg>0<arg>0 238 // where <ver> is the version number (must be "1"), <cmd> is the command 239 // name ("load, "datadump", ...) and <arg> is an argument. 240 // 241 static SolarisAttachOperation* create_operation(char* argp, size_t arg_size, int* err) { 242 // assume bad request until parsed 243 *err = SolarisAttachListener::ATTACH_ERROR_BADREQUEST; 244 245 if (arg_size < 2 || argp[arg_size-1] != '\0') { 246 return NULL; // no ver or not null terminated 247 } 248 249 // Use supporting class to iterate over the buffer 250 ArgumentIterator args(argp, arg_size); 251 252 // First check the protocol version 253 char* ver = args.next(); 254 if (ver == NULL) { 255 return NULL; 256 } 257 if (atoi(ver) != SolarisAttachListener::ATTACH_PROTOCOL_VER) { 258 *err = SolarisAttachListener::ATTACH_ERROR_BADVERSION; 259 return NULL; 260 } 261 262 // Get command name and create the operation 263 char* name = args.next(); 264 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { 265 return NULL; 266 } 267 SolarisAttachOperation* op = new SolarisAttachOperation(name); 268 269 // Iterate over the arguments 270 for (int i=0; i<AttachOperation::arg_count_max; i++) { 271 char* arg = args.next(); 272 if (arg == NULL) { 273 op->set_arg(i, NULL); 274 } else { 275 if (strlen(arg) > AttachOperation::arg_length_max) { 276 delete op; 277 return NULL; 278 } 279 op->set_arg(i, arg); 280 } 281 } 282 283 // return operation 284 *err = 0; 285 return op; 286 } 287 288 // create special operation to indicate all clients have detached 289 static SolarisAttachOperation* create_detachall_operation() { 290 return new SolarisAttachOperation(AttachOperation::detachall_operation_name()); 291 } 292 293 // This is door function which the client executes via a door_call. 294 extern "C" { 295 static void enqueue_proc(void* cookie, char* argp, size_t arg_size, 296 door_desc_t* dt, uint_t n_desc) 297 { 298 int return_fd = -1; 299 SolarisAttachOperation* op = NULL; 300 301 // wait up to 10 seconds for listener to be up and running 302 jint res = 0; 303 int sleep_count = 0; 304 while (!AttachListener::is_initialized()) { 305 sleep(1); // 1 second 306 sleep_count++; 307 if (sleep_count > 10) { // try for 10 seconds 308 debug_only(warning("door_call when not enabled")); 309 res = (jint)SolarisAttachListener::ATTACH_ERROR_INTERNAL; 310 break; 311 } 312 } 313 314 // check client credentials 315 if (res == 0) { 316 if (check_credentials() != 0) { 317 res = (jint)SolarisAttachListener::ATTACH_ERROR_DENIED; 318 } 319 } 320 321 // if we are stopped at ShowMessageBoxOnError then maybe we can 322 // load a diagnostic library 323 if (res == 0 && VMError::is_error_reported()) { 324 if (ShowMessageBoxOnError) { 325 // TBD - support loading of diagnostic library here 326 } 327 328 // can't enqueue operation after fatal error 329 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; 330 } 331 332 // create the operation 333 if (res == 0) { 334 int err; 335 op = create_operation(argp, arg_size, &err); 336 res = (op == NULL) ? (jint)err : 0; 337 } 338 339 // create a pair of connected sockets. Store the file descriptor 340 // for one end in the operation and enqueue the operation. The 341 // file descriptor for the other end wil be returned to the client. 342 if (res == 0) { 343 int s[2]; 344 if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0) { 345 delete op; 346 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; 347 } else { 348 op->set_socket(s[0]); 349 return_fd = s[1]; 350 SolarisAttachListener::enqueue(op); 351 } 352 } 353 354 // Return 0 (success) + file descriptor, or non-0 (error) 355 if (res == 0) { 356 door_desc_t desc; 357 // DOOR_RELEASE flag makes sure fd is closed after passing it to 358 // the client. See door_return(3DOOR) man page. 359 desc.d_attributes = DOOR_DESCRIPTOR | DOOR_RELEASE; 360 desc.d_data.d_desc.d_descriptor = return_fd; 361 door_return((char*)&res, sizeof(res), &desc, 1); 362 } else { 363 door_return((char*)&res, sizeof(res), NULL, 0); 364 } 365 } 366 } 367 368 // atexit hook to detach the door and remove the file 369 extern "C" { 370 static void listener_cleanup() { 371 int dd = SolarisAttachListener::door_descriptor(); 372 if (dd >= 0) { 373 SolarisAttachListener::set_door_descriptor(-1); 374 ::close(dd); 375 } 376 if (SolarisAttachListener::has_door_path()) { 377 char* path = SolarisAttachListener::door_path(); 378 ::fdetach(path); 379 ::unlink(path); 380 SolarisAttachListener::set_door_path(NULL); 381 } 382 } 383 } 384 385 // Create the door 386 int SolarisAttachListener::create_door() { 387 char door_path[PATH_MAX+1]; 388 char initial_path[PATH_MAX+1]; 389 int fd, res; 390 391 // register exit function 392 if (!_atexit_registered) { 393 _atexit_registered = true; 394 ::atexit(listener_cleanup); 395 } 396 397 // create the door descriptor 398 int dd = ::door_create(enqueue_proc, NULL, 0); 399 if (dd < 0) { 400 return -1; 401 } 402 403 // create initial file to attach door descriptor 404 snprintf(door_path, sizeof(door_path), "%s/.java_pid%d", 405 os::get_temp_directory(), os::current_process_id()); 406 snprintf(initial_path, sizeof(initial_path), "%s.tmp", door_path); 407 RESTARTABLE(::creat(initial_path, S_IRUSR | S_IWUSR), fd); 408 if (fd == -1) { 409 log_debug(attach)("attempt to create door file %s failed (%d)", initial_path, errno); 410 ::door_revoke(dd); 411 return -1; 412 } 413 assert(fd >= 0, "bad file descriptor"); 414 ::close(fd); 415 416 // attach the door descriptor to the file 417 if ((res = ::fattach(dd, initial_path)) == -1) { 418 // if busy then detach and try again 419 if (errno == EBUSY) { 420 ::fdetach(initial_path); 421 res = ::fattach(dd, initial_path); 422 } 423 if (res == -1) { 424 log_debug(attach)("unable to create door - fattach failed (%d)", errno); 425 ::door_revoke(dd); 426 dd = -1; 427 } 428 } 429 430 // rename file so that clients can attach 431 if (dd >= 0) { 432 if (::rename(initial_path, door_path) == -1) { 433 ::close(dd); 434 ::fdetach(initial_path); 435 log_debug(attach)("unable to create door - rename %s to %s failed (%d)", errno); 436 dd = -1; 437 } 438 } 439 if (dd >= 0) { 440 set_door_descriptor(dd); 441 set_door_path(door_path); 442 log_trace(attach)("door file %s created succesfully", door_path); 443 } else { 444 // unable to create door, attach it to file, or rename file into place 445 ::unlink(initial_path); 446 return -1; 447 } 448 449 return 0; 450 } 451 452 // Initialization - create the door, locks, and other initialization 453 int SolarisAttachListener::init() { 454 if (create_door()) { 455 return -1; 456 } 457 458 int status = os::Solaris::mutex_init(&_mutex); 459 assert_status(status==0, status, "mutex_init"); 460 461 status = ::sema_init(&_wakeup, 0, NULL, NULL); 462 assert_status(status==0, status, "sema_init"); 463 464 set_head(NULL); 465 set_tail(NULL); 466 467 return 0; 468 } 469 470 // Dequeue an operation 471 SolarisAttachOperation* SolarisAttachListener::dequeue() { 472 for (;;) { 473 int res; 474 475 // wait for somebody to enqueue something 476 while ((res = ::sema_wait(wakeup())) == EINTR) 477 ; 478 if (res) { 479 warning("sema_wait failed: %s", os::strerror(res)); 480 return NULL; 481 } 482 483 // lock the list 484 res = os::Solaris::mutex_lock(mutex()); 485 assert(res == 0, "mutex_lock failed"); 486 487 // remove the head of the list 488 SolarisAttachOperation* op = head(); 489 if (op != NULL) { 490 set_head(op->next()); 491 if (head() == NULL) { 492 set_tail(NULL); 493 } 494 } 495 496 // unlock 497 os::Solaris::mutex_unlock(mutex()); 498 499 // if we got an operation when return it. 500 if (op != NULL) { 501 return op; 502 } 503 } 504 } 505 506 // Enqueue an operation 507 void SolarisAttachListener::enqueue(SolarisAttachOperation* op) { 508 // lock list 509 int res = os::Solaris::mutex_lock(mutex()); 510 assert(res == 0, "mutex_lock failed"); 511 512 // enqueue at tail 513 op->set_next(NULL); 514 if (head() == NULL) { 515 set_head(op); 516 } else { 517 tail()->set_next(op); 518 } 519 set_tail(op); 520 521 // wakeup the attach listener 522 RESTARTABLE(::sema_post(wakeup()), res); 523 assert(res == 0, "sema_post failed"); 524 525 // unlock 526 os::Solaris::mutex_unlock(mutex()); 527 } 528 529 530 // support function - writes the (entire) buffer to a socket 531 static int write_fully(int s, char* buf, int len) { 532 do { 533 int n = ::write(s, buf, len); 534 if (n == -1) { 535 if (errno != EINTR) return -1; 536 } else { 537 buf += n; 538 len -= n; 539 } 540 } 541 while (len > 0); 542 return 0; 543 } 544 545 // Complete an operation by sending the operation result and any result 546 // output to the client. At this time the socket is in blocking mode so 547 // potentially we can block if there is a lot of data and the client is 548 // non-responsive. For most operations this is a non-issue because the 549 // default send buffer is sufficient to buffer everything. In the future 550 // if there are operations that involves a very big reply then it the 551 // socket could be made non-blocking and a timeout could be used. 552 553 void SolarisAttachOperation::complete(jint res, bufferedStream* st) { 554 if (this->socket() >= 0) { 555 JavaThread* thread = JavaThread::current(); 556 ThreadBlockInVM tbivm(thread); 557 558 thread->set_suspend_equivalent(); 559 // cleared by handle_special_suspend_equivalent_condition() or 560 // java_suspend_self() via check_and_wait_while_suspended() 561 562 // write operation result 563 char msg[32]; 564 sprintf(msg, "%d\n", res); 565 int rc = write_fully(this->socket(), msg, strlen(msg)); 566 567 // write any result data 568 if (rc == 0) { 569 write_fully(this->socket(), (char*) st->base(), st->size()); 570 ::shutdown(this->socket(), 2); 571 } 572 573 // close socket and we're done 574 ::close(this->socket()); 575 576 // were we externally suspended while we were waiting? 577 thread->check_and_wait_while_suspended(); 578 } 579 delete this; 580 } 581 582 583 // AttachListener functions 584 585 AttachOperation* AttachListener::dequeue() { 586 JavaThread* thread = JavaThread::current(); 587 ThreadBlockInVM tbivm(thread); 588 589 thread->set_suspend_equivalent(); 590 // cleared by handle_special_suspend_equivalent_condition() or 591 // java_suspend_self() via check_and_wait_while_suspended() 592 593 AttachOperation* op = SolarisAttachListener::dequeue(); 594 595 // were we externally suspended while we were waiting? 596 thread->check_and_wait_while_suspended(); 597 598 return op; 599 } 600 601 602 // Performs initialization at vm startup 603 // For Solaris we remove any stale .java_pid file which could cause 604 // an attaching process to think we are ready to receive a door_call 605 // before we are properly initialized 606 607 void AttachListener::vm_start() { 608 char fn[PATH_MAX+1]; 609 struct stat64 st; 610 int ret; 611 612 int n = snprintf(fn, sizeof(fn), "%s/.java_pid%d", 613 os::get_temp_directory(), os::current_process_id()); 614 assert(n < sizeof(fn), "java_pid file name buffer overflow"); 615 616 RESTARTABLE(::stat64(fn, &st), ret); 617 if (ret == 0) { 618 ret = ::unlink(fn); 619 if (ret == -1) { 620 log_debug(attach)("Failed to remove stale attach pid file at %s", fn); 621 } 622 } 623 } 624 625 int AttachListener::pd_init() { 626 JavaThread* thread = JavaThread::current(); 627 ThreadBlockInVM tbivm(thread); 628 629 thread->set_suspend_equivalent(); 630 // cleared by handle_special_suspend_equivalent_condition() or 631 // java_suspend_self() 632 633 int ret_code = SolarisAttachListener::init(); 634 635 // were we externally suspended while we were waiting? 636 thread->check_and_wait_while_suspended(); 637 638 return ret_code; 639 } 640 641 // Attach Listener is started lazily except in the case when 642 // +ReduseSignalUsage is used 643 bool AttachListener::init_at_startup() { 644 if (ReduceSignalUsage) { 645 return true; 646 } else { 647 return false; 648 } 649 } 650 651 bool AttachListener::check_socket_file() { 652 int ret; 653 struct stat64 st; 654 ret = stat64(SolarisAttachListener::door_path(), &st); 655 if (ret == -1) { // need to restart attach listener. 656 log_debug(attach)("Door file %s does not exist - Restart Attach Listener", 657 SolarisAttachListener::door_path()); 658 659 listener_cleanup(); 660 661 // wait to terminate current attach listener instance... 662 while (AttachListener::transit_state(AL_INITIALIZING, 663 AL_NOT_INITIALIZED) != AL_NOT_INITIALIZED) { 664 os::naked_yield(); 665 } 666 return is_init_trigger(); 667 } 668 return false; 669 } 670 671 // If the file .attach_pid<pid> exists in the working directory 672 // or /tmp then this is the trigger to start the attach mechanism 673 bool AttachListener::is_init_trigger() { 674 if (init_at_startup() || is_initialized()) { 675 return false; // initialized at startup or already initialized 676 } 677 char fn[PATH_MAX + 1]; 678 int ret; 679 struct stat64 st; 680 sprintf(fn, ".attach_pid%d", os::current_process_id()); 681 RESTARTABLE(::stat64(fn, &st), ret); 682 if (ret == -1) { 683 log_trace(attach)("Failed to find attach file: %s, trying alternate", fn); 684 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", 685 os::get_temp_directory(), os::current_process_id()); 686 RESTARTABLE(::stat64(fn, &st), ret); 687 if (ret == -1) { 688 log_debug(attach)("Failed to find attach file: %s", fn); 689 } 690 } 691 if (ret == 0) { 692 // simple check to avoid starting the attach mechanism when 693 // a bogus non-root user creates the file 694 if (os::Posix::matches_effective_uid_or_root(st.st_uid)) { 695 init(); 696 log_trace(attach)("Attach triggered by %s", fn); 697 return true; 698 } else { 699 log_debug(attach)("File %s has wrong user id %d (vs %d). Attach is not triggered", fn, st.st_uid, geteuid()); 700 } 701 } 702 return false; 703 } 704 705 // if VM aborts then detach/cleanup 706 void AttachListener::abort() { 707 listener_cleanup(); 708 } 709 710 void AttachListener::pd_data_dump() { 711 os::signal_notify(SIGQUIT); 712 } 713 714 static jint enable_dprobes(AttachOperation* op, outputStream* out) { 715 const char* probe = op->arg(0); 716 if (probe == NULL || probe[0] == '\0') { 717 out->print_cr("No probe specified"); 718 return JNI_ERR; 719 } else { 720 char *end; 721 long val = strtol(probe, &end, 10); 722 if (end == probe || val < 0 || val > INT_MAX) { 723 out->print_cr("invalid probe type"); 724 return JNI_ERR; 725 } else { 726 int probe_typess = (int) val; 727 DTrace::enable_dprobes(probe_typess); 728 return JNI_OK; 729 } 730 } 731 } 732 733 // platform specific operations table 734 static AttachOperationFunctionInfo funcs[] = { 735 { "enabledprobes", enable_dprobes }, 736 { NULL, NULL } 737 }; 738 739 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* name) { 740 int i; 741 for (i = 0; funcs[i].name != NULL; i++) { 742 if (strcmp(funcs[i].name, name) == 0) { 743 return &funcs[i]; 744 } 745 } 746 return NULL; 747 } 748 749 // Solaris specific global flag set. Currently, we support only 750 // changing ExtendedDTraceProbes flag. 751 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { 752 const char* name = op->arg(0); 753 assert(name != NULL, "flag name should not be null"); 754 bool flag = true; 755 const char* arg1; 756 if ((arg1 = op->arg(1)) != NULL) { 757 char *end; 758 flag = (strtol(arg1, &end, 10) != 0); 759 if (arg1 == end) { 760 out->print_cr("flag value has to be an integer"); 761 return JNI_ERR; 762 } 763 } 764 765 if (strcmp(name, "ExtendedDTraceProbes") == 0) { 766 DTrace::set_extended_dprobes(flag); 767 return JNI_OK; 768 } 769 770 if (strcmp(name, "DTraceMonitorProbes") == 0) { 771 DTrace::set_monitor_dprobes(flag); 772 return JNI_OK; 773 } 774 775 out->print_cr("flag '%s' cannot be changed", name); 776 return JNI_ERR; 777 } 778 779 void AttachListener::pd_detachall() { 780 DTrace::detach_all_clients(); 781 }