1 /* 2 * Copyright (c) 2005, 2018, 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 void set_door_path(char* path) { 79 if (path == NULL) { 80 _has_door_path = false; 81 } else { 82 strncpy(_door_path, path, PATH_MAX); 83 _door_path[PATH_MAX] = '\0'; // ensure it's nul terminated 84 _has_door_path = true; 85 } 86 } 87 88 static void set_door_descriptor(int dd) { _door_descriptor = dd; } 89 90 // mutex to protect operation list 91 static mutex_t _mutex; 92 93 // semaphore to wakeup listener thread 94 static sema_t _wakeup; 95 96 static mutex_t* mutex() { return &_mutex; } 97 static sema_t* wakeup() { return &_wakeup; } 98 99 // enqueued operation list 100 static SolarisAttachOperation* _head; 101 static SolarisAttachOperation* _tail; 102 103 static SolarisAttachOperation* head() { return _head; } 104 static void set_head(SolarisAttachOperation* head) { _head = head; } 105 106 static SolarisAttachOperation* tail() { return _tail; } 107 static void set_tail(SolarisAttachOperation* tail) { _tail = tail; } 108 109 // create the door 110 static int create_door(); 111 112 public: 113 enum { 114 ATTACH_PROTOCOL_VER = 1 // protocol version 115 }; 116 enum { 117 ATTACH_ERROR_BADREQUEST = 100, // error code returned by 118 ATTACH_ERROR_BADVERSION = 101, // the door call 119 ATTACH_ERROR_RESOURCE = 102, 120 ATTACH_ERROR_INTERNAL = 103, 121 ATTACH_ERROR_DENIED = 104 122 }; 123 124 // initialize the listener 125 static int init(); 126 127 static bool has_door_path() { return _has_door_path; } 128 static char* door_path() { return _door_path; } 129 static int door_descriptor() { return _door_descriptor; } 130 131 // enqueue an operation 132 static void enqueue(SolarisAttachOperation* op); 133 134 // dequeue an operation 135 static SolarisAttachOperation* dequeue(); 136 }; 137 138 139 // SolarisAttachOperation is an AttachOperation that additionally encapsulates 140 // a socket connection to the requesting client/tool. SolarisAttachOperation 141 // can additionally be held in a linked list. 142 143 class SolarisAttachOperation: public AttachOperation { 144 private: 145 friend class SolarisAttachListener; 146 147 // connection to client 148 int _socket; 149 150 // linked list support 151 SolarisAttachOperation* _next; 152 153 SolarisAttachOperation* next() { return _next; } 154 void set_next(SolarisAttachOperation* next) { _next = next; } 155 156 public: 157 void complete(jint res, bufferedStream* st); 158 159 int socket() const { return _socket; } 160 void set_socket(int s) { _socket = s; } 161 162 SolarisAttachOperation(char* name) : AttachOperation(name) { 163 set_socket(-1); 164 set_next(NULL); 165 } 166 }; 167 168 // statics 169 char SolarisAttachListener::_door_path[PATH_MAX+1]; 170 volatile bool SolarisAttachListener::_has_door_path; 171 int SolarisAttachListener::_door_descriptor = -1; 172 mutex_t SolarisAttachListener::_mutex; 173 sema_t SolarisAttachListener::_wakeup; 174 SolarisAttachOperation* SolarisAttachListener::_head = NULL; 175 SolarisAttachOperation* SolarisAttachListener::_tail = NULL; 176 177 // Supporting class to help split a buffer into individual components 178 class ArgumentIterator : public StackObj { 179 private: 180 char* _pos; 181 char* _end; 182 public: 183 ArgumentIterator(char* arg_buffer, size_t arg_size) { 184 _pos = arg_buffer; 185 _end = _pos + arg_size - 1; 186 } 187 char* next() { 188 if (*_pos == '\0') { 189 // advance the iterator if possible (null arguments) 190 if (_pos < _end) { 191 _pos += 1; 192 } 193 return NULL; 194 } 195 char* res = _pos; 196 char* next_pos = strchr(_pos, '\0'); 197 if (next_pos < _end) { 198 next_pos++; 199 } 200 _pos = next_pos; 201 return res; 202 } 203 }; 204 205 // Calls from the door function to check that the client credentials 206 // match this process. Returns 0 if credentials okay, otherwise -1. 207 static int check_credentials() { 208 ucred_t *cred_info = NULL; 209 int ret = -1; // deny by default 210 211 // get client credentials 212 if (door_ucred(&cred_info) == -1) { 213 return -1; // unable to get them, deny 214 } 215 216 // get euid/egid from ucred_free 217 uid_t ucred_euid = ucred_geteuid(cred_info); 218 gid_t ucred_egid = ucred_getegid(cred_info); 219 220 // check that the effective uid/gid matches 221 if (os::Posix::matches_effective_uid_and_gid_or_root(ucred_euid, ucred_egid)) { 222 ret = 0; // allow 223 } 224 225 ucred_free(cred_info); 226 return ret; 227 } 228 229 230 // Parses the argument buffer to create an AttachOperation that we should 231 // enqueue to the attach listener. 232 // The buffer is expected to be formatted as follows: 233 // <ver>0<cmd>0<arg>0<arg>0<arg>0 234 // where <ver> is the version number (must be "1"), <cmd> is the command 235 // name ("load, "datadump", ...) and <arg> is an argument. 236 // 237 static SolarisAttachOperation* create_operation(char* argp, size_t arg_size, int* err) { 238 // assume bad request until parsed 239 *err = SolarisAttachListener::ATTACH_ERROR_BADREQUEST; 240 241 if (arg_size < 2 || argp[arg_size-1] != '\0') { 242 return NULL; // no ver or not null terminated 243 } 244 245 // Use supporting class to iterate over the buffer 246 ArgumentIterator args(argp, arg_size); 247 248 // First check the protocol version 249 char* ver = args.next(); 250 if (ver == NULL) { 251 return NULL; 252 } 253 if (atoi(ver) != SolarisAttachListener::ATTACH_PROTOCOL_VER) { 254 *err = SolarisAttachListener::ATTACH_ERROR_BADVERSION; 255 return NULL; 256 } 257 258 // Get command name and create the operation 259 char* name = args.next(); 260 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { 261 return NULL; 262 } 263 SolarisAttachOperation* op = new SolarisAttachOperation(name); 264 265 // Iterate over the arguments 266 for (int i=0; i<AttachOperation::arg_count_max; i++) { 267 char* arg = args.next(); 268 if (arg == NULL) { 269 op->set_arg(i, NULL); 270 } else { 271 if (strlen(arg) > AttachOperation::arg_length_max) { 272 delete op; 273 return NULL; 274 } 275 op->set_arg(i, arg); 276 } 277 } 278 279 // return operation 280 *err = 0; 281 return op; 282 } 283 284 // create special operation to indicate all clients have detached 285 static SolarisAttachOperation* create_detachall_operation() { 286 return new SolarisAttachOperation(AttachOperation::detachall_operation_name()); 287 } 288 289 // This is door function which the client executes via a door_call. 290 extern "C" { 291 static void enqueue_proc(void* cookie, char* argp, size_t arg_size, 292 door_desc_t* dt, uint_t n_desc) 293 { 294 int return_fd = -1; 295 SolarisAttachOperation* op = NULL; 296 297 // wait up to 10 seconds for listener to be up and running 298 jint res = 0; 299 int sleep_count = 0; 300 while (!AttachListener::is_initialized()) { 301 sleep(1); // 1 second 302 sleep_count++; 303 if (sleep_count > 10) { // try for 10 seconds 304 debug_only(warning("door_call when not enabled")); 305 res = (jint)SolarisAttachListener::ATTACH_ERROR_INTERNAL; 306 break; 307 } 308 } 309 310 // check client credentials 311 if (res == 0) { 312 if (check_credentials() != 0) { 313 res = (jint)SolarisAttachListener::ATTACH_ERROR_DENIED; 314 } 315 } 316 317 // if we are stopped at ShowMessageBoxOnError then maybe we can 318 // load a diagnostic library 319 if (res == 0 && VMError::is_error_reported()) { 320 if (ShowMessageBoxOnError) { 321 // TBD - support loading of diagnostic library here 322 } 323 324 // can't enqueue operation after fatal error 325 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; 326 } 327 328 // create the operation 329 if (res == 0) { 330 int err; 331 op = create_operation(argp, arg_size, &err); 332 res = (op == NULL) ? (jint)err : 0; 333 } 334 335 // create a pair of connected sockets. Store the file descriptor 336 // for one end in the operation and enqueue the operation. The 337 // file descriptor for the other end wil be returned to the client. 338 if (res == 0) { 339 int s[2]; 340 if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0) { 341 delete op; 342 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; 343 } else { 344 op->set_socket(s[0]); 345 return_fd = s[1]; 346 SolarisAttachListener::enqueue(op); 347 } 348 } 349 350 // Return 0 (success) + file descriptor, or non-0 (error) 351 if (res == 0) { 352 door_desc_t desc; 353 // DOOR_RELEASE flag makes sure fd is closed after passing it to 354 // the client. See door_return(3DOOR) man page. 355 desc.d_attributes = DOOR_DESCRIPTOR | DOOR_RELEASE; 356 desc.d_data.d_desc.d_descriptor = return_fd; 357 door_return((char*)&res, sizeof(res), &desc, 1); 358 } else { 359 door_return((char*)&res, sizeof(res), NULL, 0); 360 } 361 } 362 } 363 364 // atexit hook to detach the door and remove the file 365 extern "C" { 366 static void listener_cleanup() { 367 static int cleanup_done; 368 if (!cleanup_done) { 369 cleanup_done = 1; 370 int dd = SolarisAttachListener::door_descriptor(); 371 if (dd >= 0) { 372 ::close(dd); 373 } 374 if (SolarisAttachListener::has_door_path()) { 375 char* path = SolarisAttachListener::door_path(); 376 ::fdetach(path); 377 ::unlink(path); 378 } 379 } 380 } 381 } 382 383 // Create the door 384 int SolarisAttachListener::create_door() { 385 char door_path[PATH_MAX+1]; 386 char initial_path[PATH_MAX+1]; 387 int fd, res; 388 389 // register exit function 390 ::atexit(listener_cleanup); 391 392 // create the door descriptor 393 int dd = ::door_create(enqueue_proc, NULL, 0); 394 if (dd < 0) { 395 return -1; 396 } 397 398 // create initial file to attach door descriptor 399 snprintf(door_path, sizeof(door_path), "%s/.java_pid%d", 400 os::get_temp_directory(), os::current_process_id()); 401 snprintf(initial_path, sizeof(initial_path), "%s.tmp", door_path); 402 RESTARTABLE(::creat(initial_path, S_IRUSR | S_IWUSR), fd); 403 if (fd == -1) { 404 log_debug(attach)("attempt to create door file %s failed (%d)", initial_path, errno); 405 ::door_revoke(dd); 406 return -1; 407 } 408 assert(fd >= 0, "bad file descriptor"); 409 ::close(fd); 410 411 // attach the door descriptor to the file 412 if ((res = ::fattach(dd, initial_path)) == -1) { 413 // if busy then detach and try again 414 if (errno == EBUSY) { 415 ::fdetach(initial_path); 416 res = ::fattach(dd, initial_path); 417 } 418 if (res == -1) { 419 log_debug(attach)("unable to create door - fattach failed (%d)", errno); 420 ::door_revoke(dd); 421 dd = -1; 422 } 423 } 424 425 // rename file so that clients can attach 426 if (dd >= 0) { 427 if (::rename(initial_path, door_path) == -1) { 428 ::close(dd); 429 ::fdetach(initial_path); 430 log_debug(attach)("unable to create door - rename %s to %s failed (%d)", errno); 431 dd = -1; 432 } 433 } 434 if (dd >= 0) { 435 set_door_descriptor(dd); 436 set_door_path(door_path); 437 log_trace(attach)("door file %s created succesfully", door_path); 438 } else { 439 // unable to create door, attach it to file, or rename file into place 440 ::unlink(initial_path); 441 return -1; 442 } 443 444 return 0; 445 } 446 447 // Initialization - create the door, locks, and other initialization 448 int SolarisAttachListener::init() { 449 if (create_door()) { 450 return -1; 451 } 452 453 int status = os::Solaris::mutex_init(&_mutex); 454 assert_status(status==0, status, "mutex_init"); 455 456 status = ::sema_init(&_wakeup, 0, NULL, NULL); 457 assert_status(status==0, status, "sema_init"); 458 459 set_head(NULL); 460 set_tail(NULL); 461 462 return 0; 463 } 464 465 // Dequeue an operation 466 SolarisAttachOperation* SolarisAttachListener::dequeue() { 467 for (;;) { 468 int res; 469 470 // wait for somebody to enqueue something 471 while ((res = ::sema_wait(wakeup())) == EINTR) 472 ; 473 if (res) { 474 warning("sema_wait failed: %s", os::strerror(res)); 475 return NULL; 476 } 477 478 // lock the list 479 res = os::Solaris::mutex_lock(mutex()); 480 assert(res == 0, "mutex_lock failed"); 481 482 // remove the head of the list 483 SolarisAttachOperation* op = head(); 484 if (op != NULL) { 485 set_head(op->next()); 486 if (head() == NULL) { 487 set_tail(NULL); 488 } 489 } 490 491 // unlock 492 os::Solaris::mutex_unlock(mutex()); 493 494 // if we got an operation when return it. 495 if (op != NULL) { 496 return op; 497 } 498 } 499 } 500 501 // Enqueue an operation 502 void SolarisAttachListener::enqueue(SolarisAttachOperation* op) { 503 // lock list 504 int res = os::Solaris::mutex_lock(mutex()); 505 assert(res == 0, "mutex_lock failed"); 506 507 // enqueue at tail 508 op->set_next(NULL); 509 if (head() == NULL) { 510 set_head(op); 511 } else { 512 tail()->set_next(op); 513 } 514 set_tail(op); 515 516 // wakeup the attach listener 517 RESTARTABLE(::sema_post(wakeup()), res); 518 assert(res == 0, "sema_post failed"); 519 520 // unlock 521 os::Solaris::mutex_unlock(mutex()); 522 } 523 524 525 // support function - writes the (entire) buffer to a socket 526 static int write_fully(int s, char* buf, int len) { 527 do { 528 int n = ::write(s, buf, len); 529 if (n == -1) { 530 if (errno != EINTR) return -1; 531 } else { 532 buf += n; 533 len -= n; 534 } 535 } 536 while (len > 0); 537 return 0; 538 } 539 540 // Complete an operation by sending the operation result and any result 541 // output to the client. At this time the socket is in blocking mode so 542 // potentially we can block if there is a lot of data and the client is 543 // non-responsive. For most operations this is a non-issue because the 544 // default send buffer is sufficient to buffer everything. In the future 545 // if there are operations that involves a very big reply then it the 546 // socket could be made non-blocking and a timeout could be used. 547 548 void SolarisAttachOperation::complete(jint res, bufferedStream* st) { 549 if (this->socket() >= 0) { 550 JavaThread* thread = JavaThread::current(); 551 ThreadBlockInVM tbivm(thread); 552 553 thread->set_suspend_equivalent(); 554 // cleared by handle_special_suspend_equivalent_condition() or 555 // java_suspend_self() via check_and_wait_while_suspended() 556 557 // write operation result 558 char msg[32]; 559 sprintf(msg, "%d\n", res); 560 int rc = write_fully(this->socket(), msg, strlen(msg)); 561 562 // write any result data 563 if (rc == 0) { 564 write_fully(this->socket(), (char*) st->base(), st->size()); 565 ::shutdown(this->socket(), 2); 566 } 567 568 // close socket and we're done 569 ::close(this->socket()); 570 571 // were we externally suspended while we were waiting? 572 thread->check_and_wait_while_suspended(); 573 } 574 delete this; 575 } 576 577 578 // AttachListener functions 579 580 AttachOperation* AttachListener::dequeue() { 581 JavaThread* thread = JavaThread::current(); 582 ThreadBlockInVM tbivm(thread); 583 584 thread->set_suspend_equivalent(); 585 // cleared by handle_special_suspend_equivalent_condition() or 586 // java_suspend_self() via check_and_wait_while_suspended() 587 588 AttachOperation* op = SolarisAttachListener::dequeue(); 589 590 // were we externally suspended while we were waiting? 591 thread->check_and_wait_while_suspended(); 592 593 return op; 594 } 595 596 597 // Performs initialization at vm startup 598 // For Solaris we remove any stale .java_pid file which could cause 599 // an attaching process to think we are ready to receive a door_call 600 // before we are properly initialized 601 602 void AttachListener::vm_start() { 603 char fn[PATH_MAX+1]; 604 struct stat64 st; 605 int ret; 606 607 int n = snprintf(fn, sizeof(fn), "%s/.java_pid%d", 608 os::get_temp_directory(), os::current_process_id()); 609 assert(n < sizeof(fn), "java_pid file name buffer overflow"); 610 611 RESTARTABLE(::stat64(fn, &st), ret); 612 if (ret == 0) { 613 ret = ::unlink(fn); 614 if (ret == -1) { 615 log_debug(attach)("Failed to remove stale attach pid file at %s", fn); 616 } 617 } 618 } 619 620 int AttachListener::pd_init() { 621 JavaThread* thread = JavaThread::current(); 622 ThreadBlockInVM tbivm(thread); 623 624 thread->set_suspend_equivalent(); 625 // cleared by handle_special_suspend_equivalent_condition() or 626 // java_suspend_self() 627 628 int ret_code = SolarisAttachListener::init(); 629 630 // were we externally suspended while we were waiting? 631 thread->check_and_wait_while_suspended(); 632 633 return ret_code; 634 } 635 636 // Attach Listener is started lazily except in the case when 637 // +ReduseSignalUsage is used 638 bool AttachListener::init_at_startup() { 639 if (ReduceSignalUsage) { 640 return true; 641 } else { 642 return false; 643 } 644 } 645 646 // If the file .attach_pid<pid> exists in the working directory 647 // or /tmp then this is the trigger to start the attach mechanism 648 bool AttachListener::is_init_trigger() { 649 if (init_at_startup() || is_initialized()) { 650 return false; // initialized at startup or already initialized 651 } 652 char fn[PATH_MAX + 1]; 653 int ret; 654 struct stat64 st; 655 sprintf(fn, ".attach_pid%d", os::current_process_id()); 656 RESTARTABLE(::stat64(fn, &st), ret); 657 if (ret == -1) { 658 log_trace(attach)("Failed to find attach file: %s, trying alternate", fn); 659 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", 660 os::get_temp_directory(), os::current_process_id()); 661 RESTARTABLE(::stat64(fn, &st), ret); 662 if (ret == -1) { 663 log_debug(attach)("Failed to find attach file: %s", fn); 664 } 665 } 666 if (ret == 0) { 667 // simple check to avoid starting the attach mechanism when 668 // a bogus non-root user creates the file 669 if (os::Posix::matches_effective_uid_or_root(st.st_uid)) { 670 init(); 671 log_trace(attach)("Attach triggered by %s", fn); 672 return true; 673 } else { 674 log_debug(attach)("File %s has wrong user id %d (vs %d). Attach is not triggered", fn, st.st_uid, geteuid()); 675 } 676 } 677 return false; 678 } 679 680 // if VM aborts then detach/cleanup 681 void AttachListener::abort() { 682 listener_cleanup(); 683 } 684 685 void AttachListener::pd_data_dump() { 686 os::signal_notify(SIGQUIT); 687 } 688 689 static jint enable_dprobes(AttachOperation* op, outputStream* out) { 690 const char* probe = op->arg(0); 691 if (probe == NULL || probe[0] == '\0') { 692 out->print_cr("No probe specified"); 693 return JNI_ERR; 694 } else { 695 char *end; 696 long val = strtol(probe, &end, 10); 697 if (end == probe || val < 0 || val > INT_MAX) { 698 out->print_cr("invalid probe type"); 699 return JNI_ERR; 700 } else { 701 int probe_typess = (int) val; 702 DTrace::enable_dprobes(probe_typess); 703 return JNI_OK; 704 } 705 } 706 } 707 708 // platform specific operations table 709 static AttachOperationFunctionInfo funcs[] = { 710 { "enabledprobes", enable_dprobes }, 711 { NULL, NULL } 712 }; 713 714 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* name) { 715 int i; 716 for (i = 0; funcs[i].name != NULL; i++) { 717 if (strcmp(funcs[i].name, name) == 0) { 718 return &funcs[i]; 719 } 720 } 721 return NULL; 722 } 723 724 // Solaris specific global flag set. Currently, we support only 725 // changing ExtendedDTraceProbes flag. 726 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { 727 const char* name = op->arg(0); 728 assert(name != NULL, "flag name should not be null"); 729 bool flag = true; 730 const char* arg1; 731 if ((arg1 = op->arg(1)) != NULL) { 732 char *end; 733 flag = (strtol(arg1, &end, 10) != 0); 734 if (arg1 == end) { 735 out->print_cr("flag value has to be an integer"); 736 return JNI_ERR; 737 } 738 } 739 740 if (strcmp(name, "ExtendedDTraceProbes") == 0) { 741 DTrace::set_extended_dprobes(flag); 742 return JNI_OK; 743 } 744 745 if (strcmp(name, "DTraceMonitorProbes") == 0) { 746 DTrace::set_monitor_dprobes(flag); 747 return JNI_OK; 748 } 749 750 out->print_cr("flag '%s' cannot be changed", name); 751 return JNI_ERR; 752 } 753 754 void AttachListener::pd_detachall() { 755 DTrace::detach_all_clients(); 756 }