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annotate src/os/solaris/vm/attachListener_solaris.cpp @ 1675:a81afd9c293c
6649594: Intermittent IOExceptions during dynamic attach on linux and solaris
Reviewed-by: dcubed, dholmes
| author | alanb |
|---|---|
| date | Fri, 16 Jul 2010 13:14:03 +0100 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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]; | |
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367 char initial_path[PATH_MAX+1]; |
| 0 | 368 int fd, res; |
| 369 | |
| 370 // register exit function | |
| 371 ::atexit(listener_cleanup); | |
| 372 | |
| 373 // create the door descriptor | |
| 374 int dd = ::door_create(enqueue_proc, NULL, 0); | |
| 375 if (dd < 0) { | |
| 376 return -1; | |
| 377 } | |
| 378 | |
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379 // create initial file to attach door descriptor |
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380 snprintf(door_path, sizeof(door_path), "%s/.java_pid%d", |
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381 os::get_temp_directory(), os::current_process_id()); |
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382 snprintf(initial_path, sizeof(initial_path), "%s.tmp", door_path); |
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383 RESTARTABLE(::creat(initial_path, S_IRUSR | S_IWUSR), fd); |
| 0 | 384 if (fd == -1) { |
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385 debug_only(warning("attempt to create %s failed", initial_path)); |
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386 ::door_revoke(dd); |
| 0 | 387 return -1; |
| 388 } | |
| 389 assert(fd >= 0, "bad file descriptor"); | |
| 390 RESTARTABLE(::close(fd), res); | |
| 391 | |
| 392 // attach the door descriptor to the file | |
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393 if ((res = ::fattach(dd, initial_path)) == -1) { |
| 0 | 394 // if busy then detach and try again |
| 395 if (errno == EBUSY) { | |
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396 ::fdetach(initial_path); |
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397 res = ::fattach(dd, initial_path); |
| 0 | 398 } |
| 399 if (res == -1) { | |
| 400 ::door_revoke(dd); | |
| 401 dd = -1; | |
| 402 } | |
| 403 } | |
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404 |
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405 // rename file so that clients can attach |
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406 if (dd >= 0) { |
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407 if (::rename(initial_path, door_path) == -1) { |
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408 RESTARTABLE(::close(dd), res); |
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409 ::fdetach(initial_path); |
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410 dd = -1; |
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411 } |
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412 } |
| 0 | 413 if (dd >= 0) { |
| 414 set_door_descriptor(dd); | |
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415 set_door_path(door_path); |
| 0 | 416 } else { |
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417 // unable to create door, attach it to file, or rename file into place |
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418 ::unlink(initial_path); |
| 0 | 419 return -1; |
| 420 } | |
| 421 | |
| 422 return 0; | |
| 423 } | |
| 424 | |
| 425 // Initialization - create the door, locks, and other initialization | |
| 426 int SolarisAttachListener::init() { | |
| 427 if (create_door()) { | |
| 428 return -1; | |
| 429 } | |
| 430 | |
| 431 int status = os::Solaris::mutex_init(&_mutex); | |
| 432 assert_status(status==0, status, "mutex_init"); | |
| 433 | |
| 434 status = ::sema_init(&_wakeup, 0, NULL, NULL); | |
| 435 assert_status(status==0, status, "sema_init"); | |
| 436 | |
| 437 set_head(NULL); | |
| 438 set_tail(NULL); | |
| 439 | |
| 440 return 0; | |
| 441 } | |
| 442 | |
| 443 // Dequeue an operation | |
| 444 SolarisAttachOperation* SolarisAttachListener::dequeue() { | |
| 445 for (;;) { | |
| 446 int res; | |
| 447 | |
| 448 // wait for somebody to enqueue something | |
| 449 while ((res = ::sema_wait(wakeup())) == EINTR) | |
| 450 ; | |
| 451 if (res) { | |
| 452 warning("sema_wait failed: %s", strerror(res)); | |
| 453 return NULL; | |
| 454 } | |
| 455 | |
| 456 // lock the list | |
| 457 res = os::Solaris::mutex_lock(mutex()); | |
| 458 assert(res == 0, "mutex_lock failed"); | |
| 459 | |
| 460 // remove the head of the list | |
| 461 SolarisAttachOperation* op = head(); | |
| 462 if (op != NULL) { | |
| 463 set_head(op->next()); | |
| 464 if (head() == NULL) { | |
| 465 set_tail(NULL); | |
| 466 } | |
| 467 } | |
| 468 | |
| 469 // unlock | |
| 470 os::Solaris::mutex_unlock(mutex()); | |
| 471 | |
| 472 // if we got an operation when return it. | |
| 473 if (op != NULL) { | |
| 474 return op; | |
| 475 } | |
| 476 } | |
| 477 } | |
| 478 | |
| 479 // Enqueue an operation | |
| 480 void SolarisAttachListener::enqueue(SolarisAttachOperation* op) { | |
| 481 // lock list | |
| 482 int res = os::Solaris::mutex_lock(mutex()); | |
| 483 assert(res == 0, "mutex_lock failed"); | |
| 484 | |
| 485 // enqueue at tail | |
| 486 op->set_next(NULL); | |
| 487 if (head() == NULL) { | |
| 488 set_head(op); | |
| 489 } else { | |
| 490 tail()->set_next(op); | |
| 491 } | |
| 492 set_tail(op); | |
| 493 | |
| 494 // wakeup the attach listener | |
| 495 RESTARTABLE(::sema_post(wakeup()), res); | |
| 496 assert(res == 0, "sema_post failed"); | |
| 497 | |
| 498 // unlock | |
| 499 os::Solaris::mutex_unlock(mutex()); | |
| 500 } | |
| 501 | |
| 502 | |
| 503 // support function - writes the (entire) buffer to a socket | |
| 504 static int write_fully(int s, char* buf, int len) { | |
| 505 do { | |
| 506 int n = ::write(s, buf, len); | |
| 507 if (n == -1) { | |
| 508 if (errno != EINTR) return -1; | |
| 509 } else { | |
| 510 buf += n; | |
| 511 len -= n; | |
| 512 } | |
| 513 } | |
| 514 while (len > 0); | |
| 515 return 0; | |
| 516 } | |
| 517 | |
| 518 // Complete an operation by sending the operation result and any result | |
| 519 // output to the client. At this time the socket is in blocking mode so | |
| 520 // potentially we can block if there is a lot of data and the client is | |
| 521 // non-responsive. For most operations this is a non-issue because the | |
| 522 // default send buffer is sufficient to buffer everything. In the future | |
| 523 // if there are operations that involves a very big reply then it the | |
| 524 // socket could be made non-blocking and a timeout could be used. | |
| 525 | |
| 526 void SolarisAttachOperation::complete(jint res, bufferedStream* st) { | |
| 527 if (this->socket() >= 0) { | |
| 528 JavaThread* thread = JavaThread::current(); | |
| 529 ThreadBlockInVM tbivm(thread); | |
| 530 | |
| 531 thread->set_suspend_equivalent(); | |
| 532 // cleared by handle_special_suspend_equivalent_condition() or | |
| 533 // java_suspend_self() via check_and_wait_while_suspended() | |
| 534 | |
| 535 // write operation result | |
| 536 char msg[32]; | |
| 537 sprintf(msg, "%d\n", res); | |
| 538 int rc = write_fully(this->socket(), msg, strlen(msg)); | |
| 539 | |
| 540 // write any result data | |
| 541 if (rc == 0) { | |
| 542 write_fully(this->socket(), (char*) st->base(), st->size()); | |
| 543 ::shutdown(this->socket(), 2); | |
| 544 } | |
| 545 | |
| 546 // close socket and we're done | |
| 547 RESTARTABLE(::close(this->socket()), rc); | |
| 548 | |
| 549 // were we externally suspended while we were waiting? | |
| 550 thread->check_and_wait_while_suspended(); | |
| 551 } | |
| 552 delete this; | |
| 553 } | |
| 554 | |
| 555 | |
| 556 // AttachListener functions | |
| 557 | |
| 558 AttachOperation* AttachListener::dequeue() { | |
| 559 JavaThread* thread = JavaThread::current(); | |
| 560 ThreadBlockInVM tbivm(thread); | |
| 561 | |
| 562 thread->set_suspend_equivalent(); | |
| 563 // cleared by handle_special_suspend_equivalent_condition() or | |
| 564 // java_suspend_self() via check_and_wait_while_suspended() | |
| 565 | |
| 566 AttachOperation* op = SolarisAttachListener::dequeue(); | |
| 567 | |
| 568 // were we externally suspended while we were waiting? | |
| 569 thread->check_and_wait_while_suspended(); | |
| 570 | |
| 571 return op; | |
| 572 } | |
| 573 | |
| 574 int AttachListener::pd_init() { | |
| 575 JavaThread* thread = JavaThread::current(); | |
| 576 ThreadBlockInVM tbivm(thread); | |
| 577 | |
| 578 thread->set_suspend_equivalent(); | |
| 579 // cleared by handle_special_suspend_equivalent_condition() or | |
| 580 // java_suspend_self() | |
| 581 | |
| 582 int ret_code = SolarisAttachListener::init(); | |
| 583 | |
| 584 // were we externally suspended while we were waiting? | |
| 585 thread->check_and_wait_while_suspended(); | |
| 586 | |
| 587 return ret_code; | |
| 588 } | |
| 589 | |
| 590 // Attach Listener is started lazily except in the case when | |
| 591 // +ReduseSignalUsage is used | |
| 592 bool AttachListener::init_at_startup() { | |
| 593 if (ReduceSignalUsage) { | |
| 594 return true; | |
| 595 } else { | |
| 596 return false; | |
| 597 } | |
| 598 } | |
| 599 | |
| 600 // If the file .attach_pid<pid> exists in the working directory | |
| 601 // or /tmp then this is the trigger to start the attach mechanism | |
| 602 bool AttachListener::is_init_trigger() { | |
| 603 if (init_at_startup() || is_initialized()) { | |
| 604 return false; // initialized at startup or already initialized | |
| 605 } | |
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606 char fn[PATH_MAX+1]; |
| 0 | 607 sprintf(fn, ".attach_pid%d", os::current_process_id()); |
| 608 int ret; | |
| 609 struct stat64 st; | |
| 610 RESTARTABLE(::stat64(fn, &st), ret); | |
| 611 if (ret == -1) { | |
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612 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", |
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613 os::get_temp_directory(), os::current_process_id()); |
| 0 | 614 RESTARTABLE(::stat64(fn, &st), ret); |
| 615 } | |
| 616 if (ret == 0) { | |
| 617 // simple check to avoid starting the attach mechanism when | |
| 618 // a bogus user creates the file | |
| 619 if (st.st_uid == geteuid()) { | |
| 620 init(); | |
| 621 return true; | |
| 622 } | |
| 623 } | |
| 624 return false; | |
| 625 } | |
| 626 | |
| 627 // if VM aborts then detach/cleanup | |
| 628 void AttachListener::abort() { | |
| 629 listener_cleanup(); | |
| 630 } | |
| 631 | |
| 632 void AttachListener::pd_data_dump() { | |
| 633 os::signal_notify(SIGQUIT); | |
| 634 } | |
| 635 | |
| 636 static jint enable_dprobes(AttachOperation* op, outputStream* out) { | |
| 637 const char* probe = op->arg(0); | |
| 638 if (probe == NULL || probe[0] == '\0') { | |
| 639 out->print_cr("No probe specified"); | |
| 640 return JNI_ERR; | |
| 641 } else { | |
| 642 int probe_typess = atoi(probe); | |
| 643 if (errno) { | |
| 644 out->print_cr("invalid probe type"); | |
| 645 return JNI_ERR; | |
| 646 } else { | |
| 647 DTrace::enable_dprobes(probe_typess); | |
| 648 return JNI_OK; | |
| 649 } | |
| 650 } | |
| 651 } | |
| 652 | |
| 653 // platform specific operations table | |
| 654 static AttachOperationFunctionInfo funcs[] = { | |
| 655 { "enabledprobes", enable_dprobes }, | |
| 656 { NULL, NULL } | |
| 657 }; | |
| 658 | |
| 659 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* name) { | |
| 660 int i; | |
| 661 for (i = 0; funcs[i].name != NULL; i++) { | |
| 662 if (strcmp(funcs[i].name, name) == 0) { | |
| 663 return &funcs[i]; | |
| 664 } | |
| 665 } | |
| 666 return NULL; | |
| 667 } | |
| 668 | |
| 669 // Solaris specific global flag set. Currently, we support only | |
| 670 // changing ExtendedDTraceProbes flag. | |
| 671 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { | |
| 672 const char* name = op->arg(0); | |
| 673 assert(name != NULL, "flag name should not be null"); | |
| 674 bool flag = true; | |
| 675 const char* arg1; | |
| 676 if ((arg1 = op->arg(1)) != NULL) { | |
| 677 flag = (atoi(arg1) != 0); | |
| 678 if (errno) { | |
| 679 out->print_cr("flag value has to be an integer"); | |
| 680 return JNI_ERR; | |
| 681 } | |
| 682 } | |
| 683 | |
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684 if (strcmp(name, "ExtendedDTraceProbes") == 0) { |
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685 DTrace::set_extended_dprobes(flag); |
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686 return JNI_OK; |
| 0 | 687 } |
| 688 | |
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689 if (strcmp(name, "DTraceMonitorProbes") == 0) { |
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690 DTrace::set_monitor_dprobes(flag); |
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691 return JNI_OK; |
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692 } |
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693 |
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694 out->print_cr("flag '%s' cannot be changed", name); |
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695 return JNI_ERR; |
| 0 | 696 } |
| 697 | |
| 698 void AttachListener::pd_detachall() { | |
| 699 DTrace::detach_all_clients(); | |
| 700 } |