Mercurial > hg > truffle
annotate src/os/solaris/vm/attachListener_solaris.cpp @ 6024:973046802b6f
7162955: Attach api on Solaris, too many open files
Summary: Release server-side socket after client receives it.
Reviewed-by: sla, dsamersoff, dcubed, acorn
Contributed-by: dean.long@oracle.com
| author | dlong |
|---|---|
| date | Thu, 26 Apr 2012 16:24:15 -0400 |
| parents | f95d63e2154a |
| children | b9a9ed0f8eeb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2005, 2010, 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 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "runtime/interfaceSupport.hpp" | |
| 27 #include "runtime/os.hpp" | |
| 28 #include "services/attachListener.hpp" | |
| 29 #include "services/dtraceAttacher.hpp" | |
| 0 | 30 |
| 31 #include <door.h> | |
| 32 #include <string.h> | |
| 33 #include <signal.h> | |
| 34 #include <sys/types.h> | |
| 35 #include <sys/socket.h> | |
| 36 #include <sys/stat.h> | |
| 37 | |
| 38 // stropts.h uses STR in stream ioctl defines | |
| 39 #undef STR | |
| 40 #include <stropts.h> | |
| 41 #undef STR | |
| 42 #define STR(a) #a | |
| 43 | |
| 44 // The attach mechanism on Solaris is implemented using the Doors IPC | |
| 45 // mechanism. The first tool to attempt to attach causes the attach | |
| 46 // listener thread to startup. This thread creats a door that is | |
| 47 // associated with a function that enqueues an operation to the attach | |
| 48 // listener. The door is attached to a file in the file system so that | |
| 49 // client (tools) can locate it. To enqueue an operation to the VM the | |
| 50 // client calls through the door which invokes the enqueue function in | |
| 51 // this process. The credentials of the client are checked and if the | |
| 52 // effective uid matches this process then the operation is enqueued. | |
| 53 // When an operation completes the attach listener is required to send the | |
| 54 // operation result and any result data to the client. In this implementation | |
| 55 // the result is returned via a UNIX domain socket. A pair of connected | |
| 56 // sockets (socketpair) is created in the enqueue function and the file | |
| 57 // descriptor for one of the sockets is returned to the client as the | |
| 58 // return from the door call. The other end is retained in this process. | |
| 59 // When the operation completes the result is sent to the client and | |
| 60 // the socket is closed. | |
| 61 | |
| 62 // forward reference | |
| 63 class SolarisAttachOperation; | |
| 64 | |
| 65 class SolarisAttachListener: AllStatic { | |
| 66 private: | |
| 67 | |
| 68 // the path to which we attach the door file descriptor | |
| 69 static char _door_path[PATH_MAX+1]; | |
| 70 static volatile bool _has_door_path; | |
| 71 | |
| 72 // door descriptor returned by door_create | |
| 73 static int _door_descriptor; | |
| 74 | |
| 75 static void set_door_path(char* path) { | |
| 76 if (path == NULL) { | |
| 77 _has_door_path = false; | |
| 78 } else { | |
| 79 strncpy(_door_path, path, PATH_MAX); | |
| 80 _door_path[PATH_MAX] = '\0'; // ensure it's nul terminated | |
| 81 _has_door_path = true; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 static void set_door_descriptor(int dd) { _door_descriptor = dd; } | |
| 86 | |
| 87 // mutex to protect operation list | |
| 88 static mutex_t _mutex; | |
| 89 | |
| 90 // semaphore to wakeup listener thread | |
| 91 static sema_t _wakeup; | |
| 92 | |
| 93 static mutex_t* mutex() { return &_mutex; } | |
| 94 static sema_t* wakeup() { return &_wakeup; } | |
| 95 | |
| 96 // enqueued operation list | |
| 97 static SolarisAttachOperation* _head; | |
| 98 static SolarisAttachOperation* _tail; | |
| 99 | |
| 100 static SolarisAttachOperation* head() { return _head; } | |
| 101 static void set_head(SolarisAttachOperation* head) { _head = head; } | |
| 102 | |
| 103 static SolarisAttachOperation* tail() { return _tail; } | |
| 104 static void set_tail(SolarisAttachOperation* tail) { _tail = tail; } | |
| 105 | |
| 106 // create the door | |
| 107 static int create_door(); | |
| 108 | |
| 109 public: | |
| 110 enum { | |
| 111 ATTACH_PROTOCOL_VER = 1 // protocol version | |
| 112 }; | |
| 113 enum { | |
| 114 ATTACH_ERROR_BADREQUEST = 100, // error code returned by | |
| 115 ATTACH_ERROR_BADVERSION = 101, // the door call | |
| 116 ATTACH_ERROR_RESOURCE = 102, | |
| 117 ATTACH_ERROR_INTERNAL = 103, | |
| 118 ATTACH_ERROR_DENIED = 104 | |
| 119 }; | |
| 120 | |
| 121 // initialize the listener | |
| 122 static int init(); | |
| 123 | |
| 124 static bool has_door_path() { return _has_door_path; } | |
| 125 static char* door_path() { return _door_path; } | |
| 126 static int door_descriptor() { return _door_descriptor; } | |
| 127 | |
| 128 // enqueue an operation | |
| 129 static void enqueue(SolarisAttachOperation* op); | |
| 130 | |
| 131 // dequeue an operation | |
| 132 static SolarisAttachOperation* dequeue(); | |
| 133 }; | |
| 134 | |
| 135 | |
| 136 // SolarisAttachOperation is an AttachOperation that additionally encapsulates | |
| 137 // a socket connection to the requesting client/tool. SolarisAttachOperation | |
| 138 // can additionally be held in a linked list. | |
| 139 | |
| 140 class SolarisAttachOperation: public AttachOperation { | |
| 141 private: | |
| 142 friend class SolarisAttachListener; | |
| 143 | |
| 144 // connection to client | |
| 145 int _socket; | |
| 146 | |
| 147 // linked list support | |
| 148 SolarisAttachOperation* _next; | |
| 149 | |
| 150 SolarisAttachOperation* next() { return _next; } | |
| 151 void set_next(SolarisAttachOperation* next) { _next = next; } | |
| 152 | |
| 153 public: | |
| 154 void complete(jint res, bufferedStream* st); | |
| 155 | |
| 156 int socket() const { return _socket; } | |
| 157 void set_socket(int s) { _socket = s; } | |
| 158 | |
| 159 SolarisAttachOperation(char* name) : AttachOperation(name) { | |
| 160 set_socket(-1); | |
| 161 set_next(NULL); | |
| 162 } | |
| 163 }; | |
| 164 | |
| 165 // statics | |
| 166 char SolarisAttachListener::_door_path[PATH_MAX+1]; | |
| 167 volatile bool SolarisAttachListener::_has_door_path; | |
| 168 int SolarisAttachListener::_door_descriptor = -1; | |
| 169 mutex_t SolarisAttachListener::_mutex; | |
| 170 sema_t SolarisAttachListener::_wakeup; | |
| 171 SolarisAttachOperation* SolarisAttachListener::_head = NULL; | |
| 172 SolarisAttachOperation* SolarisAttachListener::_tail = NULL; | |
| 173 | |
| 174 // Supporting class to help split a buffer into individual components | |
| 175 class ArgumentIterator : public StackObj { | |
| 176 private: | |
| 177 char* _pos; | |
| 178 char* _end; | |
| 179 public: | |
| 180 ArgumentIterator(char* arg_buffer, size_t arg_size) { | |
| 181 _pos = arg_buffer; | |
| 182 _end = _pos + arg_size - 1; | |
| 183 } | |
| 184 char* next() { | |
| 185 if (*_pos == '\0') { | |
| 186 return NULL; | |
| 187 } | |
| 188 char* res = _pos; | |
| 189 char* next_pos = strchr(_pos, '\0'); | |
| 190 if (next_pos < _end) { | |
| 191 next_pos++; | |
| 192 } | |
| 193 _pos = next_pos; | |
| 194 return res; | |
| 195 } | |
| 196 }; | |
| 197 | |
| 198 // Calls from the door function to check that the client credentials | |
| 199 // match this process. Returns 0 if credentials okay, otherwise -1. | |
| 200 static int check_credentials() { | |
| 201 door_cred_t cred_info; | |
| 202 | |
| 203 // get client credentials | |
| 204 if (door_cred(&cred_info) == -1) { | |
| 205 return -1; // unable to get them | |
| 206 } | |
| 207 | |
| 208 // get our euid/eguid (probably could cache these) | |
| 209 uid_t euid = geteuid(); | |
| 210 gid_t egid = getegid(); | |
| 211 | |
| 212 // check that the effective uid/gid matches - discuss this with Jeff. | |
| 213 if (cred_info.dc_euid == euid && cred_info.dc_egid == egid) { | |
| 214 return 0; // okay | |
| 215 } else { | |
| 216 return -1; // denied | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 | |
| 221 // Parses the argument buffer to create an AttachOperation that we should | |
| 222 // enqueue to the attach listener. | |
| 223 // The buffer is expected to be formatted as follows: | |
| 224 // <ver>0<cmd>0<arg>0<arg>0<arg>0 | |
| 225 // where <ver> is the version number (must be "1"), <cmd> is the command | |
| 226 // name ("load, "datadump", ...) and <arg> is an argument. | |
| 227 // | |
| 228 static SolarisAttachOperation* create_operation(char* argp, size_t arg_size, int* err) { | |
| 229 // assume bad request until parsed | |
| 230 *err = SolarisAttachListener::ATTACH_ERROR_BADREQUEST; | |
| 231 | |
| 232 if (arg_size < 2 || argp[arg_size-1] != '\0') { | |
| 233 return NULL; // no ver or not null terminated | |
| 234 } | |
| 235 | |
| 236 // Use supporting class to iterate over the buffer | |
| 237 ArgumentIterator args(argp, arg_size); | |
| 238 | |
| 239 // First check the protocol version | |
| 240 char* ver = args.next(); | |
| 241 if (ver == NULL) { | |
| 242 return NULL; | |
| 243 } | |
| 244 if (atoi(ver) != SolarisAttachListener::ATTACH_PROTOCOL_VER) { | |
| 245 *err = SolarisAttachListener::ATTACH_ERROR_BADVERSION; | |
| 246 return NULL; | |
| 247 } | |
| 248 | |
| 249 // Get command name and create the operation | |
| 250 char* name = args.next(); | |
| 251 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { | |
| 252 return NULL; | |
| 253 } | |
| 254 SolarisAttachOperation* op = new SolarisAttachOperation(name); | |
| 255 | |
| 256 // Iterate over the arguments | |
| 257 for (int i=0; i<AttachOperation::arg_count_max; i++) { | |
| 258 char* arg = args.next(); | |
| 259 if (arg == NULL) { | |
| 260 op->set_arg(i, NULL); | |
| 261 } else { | |
| 262 if (strlen(arg) > AttachOperation::arg_length_max) { | |
| 263 delete op; | |
| 264 return NULL; | |
| 265 } | |
| 266 op->set_arg(i, arg); | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 // return operation | |
| 271 *err = 0; | |
| 272 return op; | |
| 273 } | |
| 274 | |
| 275 // create special operation to indicate all clients have detached | |
| 276 static SolarisAttachOperation* create_detachall_operation() { | |
| 277 return new SolarisAttachOperation(AttachOperation::detachall_operation_name()); | |
| 278 } | |
| 279 | |
| 280 // This is door function which the client executes via a door_call. | |
| 281 extern "C" { | |
| 282 static void enqueue_proc(void* cookie, char* argp, size_t arg_size, | |
| 283 door_desc_t* dt, uint_t n_desc) | |
| 284 { | |
| 285 int return_fd = -1; | |
| 286 SolarisAttachOperation* op = NULL; | |
| 287 | |
| 288 // no listener | |
| 289 jint res = 0; | |
| 290 if (!AttachListener::is_initialized()) { | |
| 291 // how did we get here? | |
| 292 debug_only(warning("door_call when not enabled")); | |
| 293 res = (jint)SolarisAttachListener::ATTACH_ERROR_INTERNAL; | |
| 294 } | |
| 295 | |
| 296 // check client credentials | |
| 297 if (res == 0) { | |
| 298 if (check_credentials() != 0) { | |
| 299 res = (jint)SolarisAttachListener::ATTACH_ERROR_DENIED; | |
| 300 } | |
| 301 } | |
| 302 | |
| 303 // if we are stopped at ShowMessageBoxOnError then maybe we can | |
| 304 // load a diagnostic library | |
| 305 if (res == 0 && is_error_reported()) { | |
| 306 if (ShowMessageBoxOnError) { | |
| 307 // TBD - support loading of diagnostic library here | |
| 308 } | |
| 309 | |
| 310 // can't enqueue operation after fatal error | |
| 311 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; | |
| 312 } | |
| 313 | |
| 314 // create the operation | |
| 315 if (res == 0) { | |
| 316 int err; | |
| 317 op = create_operation(argp, arg_size, &err); | |
| 318 res = (op == NULL) ? (jint)err : 0; | |
| 319 } | |
| 320 | |
| 321 // create a pair of connected sockets. Store the file descriptor | |
| 322 // for one end in the operation and enqueue the operation. The | |
| 323 // file descriptor for the other end wil be returned to the client. | |
| 324 if (res == 0) { | |
| 325 int s[2]; | |
| 326 if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0) { | |
| 327 delete op; | |
| 328 res = (jint)SolarisAttachListener::ATTACH_ERROR_RESOURCE; | |
| 329 } else { | |
| 330 op->set_socket(s[0]); | |
| 331 return_fd = s[1]; | |
| 332 SolarisAttachListener::enqueue(op); | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 // Return 0 (success) + file descriptor, or non-0 (error) | |
| 337 if (res == 0) { | |
| 338 door_desc_t desc; | |
| 6024 | 339 // DOOR_RELEASE flag makes sure fd is closed after passing it to |
| 340 // the client. See door_return(3DOOR) man page. | |
| 341 desc.d_attributes = DOOR_DESCRIPTOR | DOOR_RELEASE; | |
| 0 | 342 desc.d_data.d_desc.d_descriptor = return_fd; |
| 343 door_return((char*)&res, sizeof(res), &desc, 1); | |
| 344 } else { | |
| 345 door_return((char*)&res, sizeof(res), NULL, 0); | |
| 346 } | |
| 347 } | |
| 348 } | |
| 349 | |
| 350 // atexit hook to detach the door and remove the file | |
| 351 extern "C" { | |
| 352 static void listener_cleanup() { | |
| 353 static int cleanup_done; | |
| 354 if (!cleanup_done) { | |
| 355 cleanup_done = 1; | |
| 356 int dd = SolarisAttachListener::door_descriptor(); | |
| 357 if (dd >= 0) { | |
| 358 ::close(dd); | |
| 359 } | |
| 360 if (SolarisAttachListener::has_door_path()) { | |
| 361 char* path = SolarisAttachListener::door_path(); | |
| 362 ::fdetach(path); | |
| 363 ::unlink(path); | |
| 364 } | |
| 365 } | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 // Create the door | |
| 370 int SolarisAttachListener::create_door() { | |
| 371 char door_path[PATH_MAX+1]; | |
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372 char initial_path[PATH_MAX+1]; |
| 0 | 373 int fd, res; |
| 374 | |
| 375 // register exit function | |
| 376 ::atexit(listener_cleanup); | |
| 377 | |
| 378 // create the door descriptor | |
| 379 int dd = ::door_create(enqueue_proc, NULL, 0); | |
| 380 if (dd < 0) { | |
| 381 return -1; | |
| 382 } | |
| 383 | |
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384 // create initial file to attach door descriptor |
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385 snprintf(door_path, sizeof(door_path), "%s/.java_pid%d", |
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386 os::get_temp_directory(), os::current_process_id()); |
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387 snprintf(initial_path, sizeof(initial_path), "%s.tmp", door_path); |
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388 RESTARTABLE(::creat(initial_path, S_IRUSR | S_IWUSR), fd); |
| 0 | 389 if (fd == -1) { |
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390 debug_only(warning("attempt to create %s failed", initial_path)); |
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391 ::door_revoke(dd); |
| 0 | 392 return -1; |
| 393 } | |
| 394 assert(fd >= 0, "bad file descriptor"); | |
| 395 RESTARTABLE(::close(fd), res); | |
| 396 | |
| 397 // attach the door descriptor to the file | |
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398 if ((res = ::fattach(dd, initial_path)) == -1) { |
| 0 | 399 // if busy then detach and try again |
| 400 if (errno == EBUSY) { | |
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401 ::fdetach(initial_path); |
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402 res = ::fattach(dd, initial_path); |
| 0 | 403 } |
| 404 if (res == -1) { | |
| 405 ::door_revoke(dd); | |
| 406 dd = -1; | |
| 407 } | |
| 408 } | |
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409 |
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410 // rename file so that clients can attach |
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411 if (dd >= 0) { |
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412 if (::rename(initial_path, door_path) == -1) { |
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413 RESTARTABLE(::close(dd), res); |
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414 ::fdetach(initial_path); |
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415 dd = -1; |
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416 } |
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417 } |
| 0 | 418 if (dd >= 0) { |
| 419 set_door_descriptor(dd); | |
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420 set_door_path(door_path); |
| 0 | 421 } else { |
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422 // unable to create door, attach it to file, or rename file into place |
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423 ::unlink(initial_path); |
| 0 | 424 return -1; |
| 425 } | |
| 426 | |
| 427 return 0; | |
| 428 } | |
| 429 | |
| 430 // Initialization - create the door, locks, and other initialization | |
| 431 int SolarisAttachListener::init() { | |
| 432 if (create_door()) { | |
| 433 return -1; | |
| 434 } | |
| 435 | |
| 436 int status = os::Solaris::mutex_init(&_mutex); | |
| 437 assert_status(status==0, status, "mutex_init"); | |
| 438 | |
| 439 status = ::sema_init(&_wakeup, 0, NULL, NULL); | |
| 440 assert_status(status==0, status, "sema_init"); | |
| 441 | |
| 442 set_head(NULL); | |
| 443 set_tail(NULL); | |
| 444 | |
| 445 return 0; | |
| 446 } | |
| 447 | |
| 448 // Dequeue an operation | |
| 449 SolarisAttachOperation* SolarisAttachListener::dequeue() { | |
| 450 for (;;) { | |
| 451 int res; | |
| 452 | |
| 453 // wait for somebody to enqueue something | |
| 454 while ((res = ::sema_wait(wakeup())) == EINTR) | |
| 455 ; | |
| 456 if (res) { | |
| 457 warning("sema_wait failed: %s", strerror(res)); | |
| 458 return NULL; | |
| 459 } | |
| 460 | |
| 461 // lock the list | |
| 462 res = os::Solaris::mutex_lock(mutex()); | |
| 463 assert(res == 0, "mutex_lock failed"); | |
| 464 | |
| 465 // remove the head of the list | |
| 466 SolarisAttachOperation* op = head(); | |
| 467 if (op != NULL) { | |
| 468 set_head(op->next()); | |
| 469 if (head() == NULL) { | |
| 470 set_tail(NULL); | |
| 471 } | |
| 472 } | |
| 473 | |
| 474 // unlock | |
| 475 os::Solaris::mutex_unlock(mutex()); | |
| 476 | |
| 477 // if we got an operation when return it. | |
| 478 if (op != NULL) { | |
| 479 return op; | |
| 480 } | |
| 481 } | |
| 482 } | |
| 483 | |
| 484 // Enqueue an operation | |
| 485 void SolarisAttachListener::enqueue(SolarisAttachOperation* op) { | |
| 486 // lock list | |
| 487 int res = os::Solaris::mutex_lock(mutex()); | |
| 488 assert(res == 0, "mutex_lock failed"); | |
| 489 | |
| 490 // enqueue at tail | |
| 491 op->set_next(NULL); | |
| 492 if (head() == NULL) { | |
| 493 set_head(op); | |
| 494 } else { | |
| 495 tail()->set_next(op); | |
| 496 } | |
| 497 set_tail(op); | |
| 498 | |
| 499 // wakeup the attach listener | |
| 500 RESTARTABLE(::sema_post(wakeup()), res); | |
| 501 assert(res == 0, "sema_post failed"); | |
| 502 | |
| 503 // unlock | |
| 504 os::Solaris::mutex_unlock(mutex()); | |
| 505 } | |
| 506 | |
| 507 | |
| 508 // support function - writes the (entire) buffer to a socket | |
| 509 static int write_fully(int s, char* buf, int len) { | |
| 510 do { | |
| 511 int n = ::write(s, buf, len); | |
| 512 if (n == -1) { | |
| 513 if (errno != EINTR) return -1; | |
| 514 } else { | |
| 515 buf += n; | |
| 516 len -= n; | |
| 517 } | |
| 518 } | |
| 519 while (len > 0); | |
| 520 return 0; | |
| 521 } | |
| 522 | |
| 523 // Complete an operation by sending the operation result and any result | |
| 524 // output to the client. At this time the socket is in blocking mode so | |
| 525 // potentially we can block if there is a lot of data and the client is | |
| 526 // non-responsive. For most operations this is a non-issue because the | |
| 527 // default send buffer is sufficient to buffer everything. In the future | |
| 528 // if there are operations that involves a very big reply then it the | |
| 529 // socket could be made non-blocking and a timeout could be used. | |
| 530 | |
| 531 void SolarisAttachOperation::complete(jint res, bufferedStream* st) { | |
| 532 if (this->socket() >= 0) { | |
| 533 JavaThread* thread = JavaThread::current(); | |
| 534 ThreadBlockInVM tbivm(thread); | |
| 535 | |
| 536 thread->set_suspend_equivalent(); | |
| 537 // cleared by handle_special_suspend_equivalent_condition() or | |
| 538 // java_suspend_self() via check_and_wait_while_suspended() | |
| 539 | |
| 540 // write operation result | |
| 541 char msg[32]; | |
| 542 sprintf(msg, "%d\n", res); | |
| 543 int rc = write_fully(this->socket(), msg, strlen(msg)); | |
| 544 | |
| 545 // write any result data | |
| 546 if (rc == 0) { | |
| 547 write_fully(this->socket(), (char*) st->base(), st->size()); | |
| 548 ::shutdown(this->socket(), 2); | |
| 549 } | |
| 550 | |
| 551 // close socket and we're done | |
| 552 RESTARTABLE(::close(this->socket()), rc); | |
| 553 | |
| 554 // were we externally suspended while we were waiting? | |
| 555 thread->check_and_wait_while_suspended(); | |
| 556 } | |
| 557 delete this; | |
| 558 } | |
| 559 | |
| 560 | |
| 561 // AttachListener functions | |
| 562 | |
| 563 AttachOperation* AttachListener::dequeue() { | |
| 564 JavaThread* thread = JavaThread::current(); | |
| 565 ThreadBlockInVM tbivm(thread); | |
| 566 | |
| 567 thread->set_suspend_equivalent(); | |
| 568 // cleared by handle_special_suspend_equivalent_condition() or | |
| 569 // java_suspend_self() via check_and_wait_while_suspended() | |
| 570 | |
| 571 AttachOperation* op = SolarisAttachListener::dequeue(); | |
| 572 | |
| 573 // were we externally suspended while we were waiting? | |
| 574 thread->check_and_wait_while_suspended(); | |
| 575 | |
| 576 return op; | |
| 577 } | |
| 578 | |
| 579 int AttachListener::pd_init() { | |
| 580 JavaThread* thread = JavaThread::current(); | |
| 581 ThreadBlockInVM tbivm(thread); | |
| 582 | |
| 583 thread->set_suspend_equivalent(); | |
| 584 // cleared by handle_special_suspend_equivalent_condition() or | |
| 585 // java_suspend_self() | |
| 586 | |
| 587 int ret_code = SolarisAttachListener::init(); | |
| 588 | |
| 589 // were we externally suspended while we were waiting? | |
| 590 thread->check_and_wait_while_suspended(); | |
| 591 | |
| 592 return ret_code; | |
| 593 } | |
| 594 | |
| 595 // Attach Listener is started lazily except in the case when | |
| 596 // +ReduseSignalUsage is used | |
| 597 bool AttachListener::init_at_startup() { | |
| 598 if (ReduceSignalUsage) { | |
| 599 return true; | |
| 600 } else { | |
| 601 return false; | |
| 602 } | |
| 603 } | |
| 604 | |
| 605 // If the file .attach_pid<pid> exists in the working directory | |
| 606 // or /tmp then this is the trigger to start the attach mechanism | |
| 607 bool AttachListener::is_init_trigger() { | |
| 608 if (init_at_startup() || is_initialized()) { | |
| 609 return false; // initialized at startup or already initialized | |
| 610 } | |
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611 char fn[PATH_MAX+1]; |
| 0 | 612 sprintf(fn, ".attach_pid%d", os::current_process_id()); |
| 613 int ret; | |
| 614 struct stat64 st; | |
| 615 RESTARTABLE(::stat64(fn, &st), ret); | |
| 616 if (ret == -1) { | |
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617 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", |
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618 os::get_temp_directory(), os::current_process_id()); |
| 0 | 619 RESTARTABLE(::stat64(fn, &st), ret); |
| 620 } | |
| 621 if (ret == 0) { | |
| 622 // simple check to avoid starting the attach mechanism when | |
| 623 // a bogus user creates the file | |
| 624 if (st.st_uid == geteuid()) { | |
| 625 init(); | |
| 626 return true; | |
| 627 } | |
| 628 } | |
| 629 return false; | |
| 630 } | |
| 631 | |
| 632 // if VM aborts then detach/cleanup | |
| 633 void AttachListener::abort() { | |
| 634 listener_cleanup(); | |
| 635 } | |
| 636 | |
| 637 void AttachListener::pd_data_dump() { | |
| 638 os::signal_notify(SIGQUIT); | |
| 639 } | |
| 640 | |
| 641 static jint enable_dprobes(AttachOperation* op, outputStream* out) { | |
| 642 const char* probe = op->arg(0); | |
| 643 if (probe == NULL || probe[0] == '\0') { | |
| 644 out->print_cr("No probe specified"); | |
| 645 return JNI_ERR; | |
| 646 } else { | |
| 647 int probe_typess = atoi(probe); | |
| 648 if (errno) { | |
| 649 out->print_cr("invalid probe type"); | |
| 650 return JNI_ERR; | |
| 651 } else { | |
| 652 DTrace::enable_dprobes(probe_typess); | |
| 653 return JNI_OK; | |
| 654 } | |
| 655 } | |
| 656 } | |
| 657 | |
| 658 // platform specific operations table | |
| 659 static AttachOperationFunctionInfo funcs[] = { | |
| 660 { "enabledprobes", enable_dprobes }, | |
| 661 { NULL, NULL } | |
| 662 }; | |
| 663 | |
| 664 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* name) { | |
| 665 int i; | |
| 666 for (i = 0; funcs[i].name != NULL; i++) { | |
| 667 if (strcmp(funcs[i].name, name) == 0) { | |
| 668 return &funcs[i]; | |
| 669 } | |
| 670 } | |
| 671 return NULL; | |
| 672 } | |
| 673 | |
| 674 // Solaris specific global flag set. Currently, we support only | |
| 675 // changing ExtendedDTraceProbes flag. | |
| 676 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { | |
| 677 const char* name = op->arg(0); | |
| 678 assert(name != NULL, "flag name should not be null"); | |
| 679 bool flag = true; | |
| 680 const char* arg1; | |
| 681 if ((arg1 = op->arg(1)) != NULL) { | |
| 682 flag = (atoi(arg1) != 0); | |
| 683 if (errno) { | |
| 684 out->print_cr("flag value has to be an integer"); | |
| 685 return JNI_ERR; | |
| 686 } | |
| 687 } | |
| 688 | |
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689 if (strcmp(name, "ExtendedDTraceProbes") == 0) { |
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690 DTrace::set_extended_dprobes(flag); |
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691 return JNI_OK; |
| 0 | 692 } |
| 693 | |
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694 if (strcmp(name, "DTraceMonitorProbes") == 0) { |
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695 DTrace::set_monitor_dprobes(flag); |
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696 return JNI_OK; |
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697 } |
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698 |
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699 out->print_cr("flag '%s' cannot be changed", name); |
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700 return JNI_ERR; |
| 0 | 701 } |
| 702 | |
| 703 void AttachListener::pd_detachall() { | |
| 704 DTrace::detach_all_clients(); | |
| 705 } |