Mercurial > hg > truffle
annotate src/os/solaris/dtrace/jvm_dtrace.c @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2006, 2013, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include <door.h> | |
| 26 #include <errno.h> | |
| 27 #include <fcntl.h> | |
| 28 #include <limits.h> | |
| 29 #include <poll.h> | |
| 30 #include <signal.h> | |
| 31 #include <stdarg.h> | |
| 32 #include <stdio.h> | |
| 33 #include <stdlib.h> | |
| 34 #include <string.h> | |
| 35 #include <sys/types.h> | |
| 36 #include <sys/stat.h> | |
| 37 #include <thread.h> | |
| 38 #include <unistd.h> | |
| 39 #include "jvm_dtrace.h" | |
| 40 | |
| 41 // NOTE: These constants are used in JVM code as well. | |
| 42 // KEEP JVM CODE IN SYNC if you are going to change these... | |
| 43 | |
| 44 #define DTRACE_ALLOC_PROBES 0x1 | |
| 45 #define DTRACE_METHOD_PROBES 0x2 | |
| 46 #define DTRACE_MONITOR_PROBES 0x4 | |
| 47 #define DTRACE_ALL_PROBES -1 | |
| 48 | |
| 49 // generic error messages | |
| 50 #define JVM_ERR_OUT_OF_MEMORY "out of memory (native heap)" | |
| 51 #define JVM_ERR_INVALID_PARAM "invalid input parameter(s)" | |
| 52 #define JVM_ERR_NULL_PARAM "input paramater is NULL" | |
| 53 | |
| 54 // error messages for attach | |
| 55 #define JVM_ERR_CANT_OPEN_DOOR "cannot open door file" | |
| 56 #define JVM_ERR_CANT_CREATE_ATTACH_FILE "cannot create attach file" | |
| 57 #define JVM_ERR_DOOR_FILE_PERMISSION "door file is not secure" | |
| 58 #define JVM_ERR_CANT_SIGNAL "cannot send SIGQUIT to target" | |
| 59 | |
| 60 // error messages for enable probe | |
| 61 #define JVM_ERR_DOOR_CMD_SEND "door command send failed" | |
| 62 #define JVM_ERR_DOOR_CANT_READ_STATUS "cannot read door command status" | |
| 63 #define JVM_ERR_DOOR_CMD_STATUS "door command error status" | |
| 64 | |
| 65 // error message for detach | |
| 66 #define JVM_ERR_CANT_CLOSE_DOOR "cannot close door file" | |
| 67 | |
| 68 #define RESTARTABLE(_cmd, _result) do { \ | |
| 69 do { \ | |
| 70 _result = _cmd; \ | |
| 71 } while((_result == -1) && (errno == EINTR)); \ | |
| 72 } while(0) | |
| 73 | |
| 74 struct _jvm_t { | |
| 75 pid_t pid; | |
| 76 int door_fd; | |
| 77 }; | |
| 78 | |
| 79 static int libjvm_dtrace_debug; | |
| 80 static void print_debug(const char* fmt,...) { | |
| 81 if (libjvm_dtrace_debug) { | |
| 82 va_list alist; | |
| 83 va_start(alist, fmt); | |
| 84 fputs("libjvm_dtrace DEBUG: ", stderr); | |
| 85 vfprintf(stderr, fmt, alist); | |
| 86 va_end(alist); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 /* Key for thread local error message */ | |
| 91 static thread_key_t jvm_error_key; | |
| 92 | |
| 93 /* init function for this library */ | |
| 94 static void init_jvm_dtrace() { | |
| 95 /* check for env. var for debug mode */ | |
| 96 libjvm_dtrace_debug = getenv("LIBJVM_DTRACE_DEBUG") != NULL; | |
| 97 /* create key for thread local error message */ | |
| 98 if (thr_keycreate(&jvm_error_key, NULL) != 0) { | |
| 99 print_debug("can't create thread_key_t for jvm error key\n"); | |
| 100 // exit(1); ? | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 #pragma init(init_jvm_dtrace) | |
| 105 | |
| 106 /* set thread local error message */ | |
| 107 static void set_jvm_error(const char* msg) { | |
| 108 thr_setspecific(jvm_error_key, (void*)msg); | |
| 109 } | |
| 110 | |
| 111 /* clear thread local error message */ | |
| 112 static void clear_jvm_error() { | |
| 113 thr_setspecific(jvm_error_key, NULL); | |
| 114 } | |
| 115 | |
| 116 /* file handling functions that can handle interrupt */ | |
| 117 | |
| 118 static int file_open(const char* path, int flag) { | |
| 119 int ret; | |
| 120 RESTARTABLE(open(path, flag), ret); | |
| 121 return ret; | |
| 122 } | |
| 123 | |
| 124 static int file_close(int fd) { | |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
1972
diff
changeset
|
125 return close(fd); |
| 0 | 126 } |
| 127 | |
| 128 static int file_read(int fd, char* buf, int len) { | |
| 129 int ret; | |
| 130 RESTARTABLE(read(fd, buf, len), ret); | |
| 131 return ret; | |
| 132 } | |
| 133 | |
| 134 /* send SIGQUIT signal to given process */ | |
| 135 static int send_sigquit(pid_t pid) { | |
| 136 int ret; | |
| 137 RESTARTABLE(kill(pid, SIGQUIT), ret); | |
| 138 return ret; | |
| 139 } | |
| 140 | |
| 141 /* called to check permissions on attach file */ | |
| 142 static int check_permission(const char* path) { | |
| 143 struct stat64 sb; | |
| 144 uid_t uid, gid; | |
| 145 int res; | |
| 146 | |
| 147 /* | |
| 148 * Check that the path is owned by the effective uid/gid of this | |
| 149 * process. Also check that group/other access is not allowed. | |
| 150 */ | |
| 151 uid = geteuid(); | |
| 152 gid = getegid(); | |
| 153 | |
| 154 res = stat64(path, &sb); | |
| 155 if (res != 0) { | |
| 156 print_debug("stat failed for %s\n", path); | |
| 157 return -1; | |
| 158 } | |
| 159 | |
| 160 if ((sb.st_uid != uid) || (sb.st_gid != gid) || | |
| 161 ((sb.st_mode & (S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) != 0)) { | |
| 162 print_debug("well-known file %s is not secure\n", path); | |
| 163 return -1; | |
| 164 } | |
| 165 return 0; | |
| 166 } | |
| 167 | |
| 168 #define ATTACH_FILE_PATTERN "/tmp/.attach_pid%d" | |
| 169 | |
| 170 /* fill-in the name of attach file name in given buffer */ | |
| 171 static void fill_attach_file_name(char* path, int len, pid_t pid) { | |
| 172 memset(path, 0, len); | |
| 173 sprintf(path, ATTACH_FILE_PATTERN, pid); | |
| 174 } | |
| 175 | |
| 176 #define DOOR_FILE_PATTERN "/tmp/.java_pid%d" | |
| 177 | |
| 178 /* open door file for the given JVM */ | |
| 179 static int open_door(pid_t pid) { | |
| 180 char path[PATH_MAX + 1]; | |
| 181 int fd; | |
| 182 | |
| 183 sprintf(path, DOOR_FILE_PATTERN, pid); | |
| 184 fd = file_open(path, O_RDONLY); | |
| 185 if (fd < 0) { | |
| 186 set_jvm_error(JVM_ERR_CANT_OPEN_DOOR); | |
| 187 print_debug("cannot open door file %s\n", path); | |
| 188 return -1; | |
| 189 } | |
| 190 print_debug("opened door file %s\n", path); | |
| 191 if (check_permission(path) != 0) { | |
| 192 set_jvm_error(JVM_ERR_DOOR_FILE_PERMISSION); | |
| 193 print_debug("check permission failed for %s\n", path); | |
| 194 file_close(fd); | |
| 195 fd = -1; | |
| 196 } | |
| 197 return fd; | |
| 198 } | |
| 199 | |
| 200 /* create attach file for given process */ | |
| 201 static int create_attach_file(pid_t pid) { | |
| 202 char path[PATH_MAX + 1]; | |
| 203 int fd; | |
| 204 fill_attach_file_name(path, sizeof(path), pid); | |
| 205 fd = file_open(path, O_CREAT | O_RDWR); | |
| 206 if (fd < 0) { | |
| 207 set_jvm_error(JVM_ERR_CANT_CREATE_ATTACH_FILE); | |
| 208 print_debug("cannot create file %s\n", path); | |
| 209 } else { | |
| 210 print_debug("created attach file %s\n", path); | |
| 211 } | |
| 212 return fd; | |
| 213 } | |
| 214 | |
| 215 /* delete attach file for given process */ | |
| 216 static void delete_attach_file(pid_t pid) { | |
| 217 char path[PATH_MAX + 1]; | |
| 218 fill_attach_file_name(path, sizeof(path), pid); | |
| 219 int res = unlink(path); | |
| 220 if (res) { | |
| 221 print_debug("cannot delete attach file %s\n", path); | |
| 222 } else { | |
| 223 print_debug("deleted attach file %s\n", path); | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 /* attach to given JVM */ | |
| 228 jvm_t* jvm_attach(pid_t pid) { | |
| 229 jvm_t* jvm; | |
| 230 int door_fd, attach_fd, i; | |
| 231 | |
| 232 jvm = (jvm_t*) calloc(1, sizeof(jvm_t)); | |
| 233 if (jvm == NULL) { | |
| 234 set_jvm_error(JVM_ERR_OUT_OF_MEMORY); | |
| 235 print_debug("calloc failed in %s at %d\n", __FILE__, __LINE__); | |
| 236 return NULL; | |
| 237 } | |
| 238 jvm->pid = pid; | |
| 239 attach_fd = -1; | |
| 240 | |
| 241 door_fd = open_door(pid); | |
| 242 if (door_fd < 0) { | |
| 243 print_debug("trying to create attach file\n"); | |
| 244 if ((attach_fd = create_attach_file(pid)) < 0) { | |
| 245 goto quit; | |
| 246 } | |
| 247 | |
| 248 /* send QUIT signal to the target so that it will | |
| 249 * check for the attach file. | |
| 250 */ | |
| 251 if (send_sigquit(pid) != 0) { | |
| 252 set_jvm_error(JVM_ERR_CANT_SIGNAL); | |
| 253 print_debug("sending SIGQUIT failed\n"); | |
| 254 goto quit; | |
| 255 } | |
| 256 | |
| 257 /* give the target VM time to start the attach mechanism */ | |
| 258 do { | |
| 259 int res; | |
| 260 RESTARTABLE(poll(0, 0, 200), res); | |
| 261 door_fd = open_door(pid); | |
| 262 i++; | |
| 263 } while (i <= 50 && door_fd == -1); | |
| 264 if (door_fd < 0) { | |
| 265 print_debug("Unable to open door to process %d\n", pid); | |
| 266 goto quit; | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 quit: | |
| 271 if (attach_fd >= 0) { | |
| 272 file_close(attach_fd); | |
| 273 delete_attach_file(jvm->pid); | |
| 274 } | |
| 275 if (door_fd >= 0) { | |
| 276 jvm->door_fd = door_fd; | |
| 277 clear_jvm_error(); | |
| 278 } else { | |
| 279 free(jvm); | |
| 280 jvm = NULL; | |
| 281 } | |
| 282 return jvm; | |
| 283 } | |
| 284 | |
| 285 /* return the last thread local error message */ | |
| 286 const char* jvm_get_last_error() { | |
| 287 const char* res = NULL; | |
| 288 thr_getspecific(jvm_error_key, (void**)&res); | |
| 289 return res; | |
| 290 } | |
| 291 | |
| 292 /* detach the givenb JVM */ | |
| 293 int jvm_detach(jvm_t* jvm) { | |
| 294 if (jvm) { | |
| 295 int res; | |
| 296 if (jvm->door_fd != -1) { | |
| 297 if (file_close(jvm->door_fd) != 0) { | |
| 298 set_jvm_error(JVM_ERR_CANT_CLOSE_DOOR); | |
| 299 res = -1; | |
| 300 } else { | |
| 301 clear_jvm_error(); | |
| 302 res = 0; | |
| 303 } | |
| 304 } | |
| 305 free(jvm); | |
| 306 return res; | |
| 307 } else { | |
| 308 set_jvm_error(JVM_ERR_NULL_PARAM); | |
| 309 print_debug("jvm_t* is NULL\n"); | |
| 310 return -1; | |
| 311 } | |
| 312 } | |
| 313 | |
| 314 /* | |
| 315 * A simple table to translate some known errors into reasonable | |
| 316 * error messages | |
| 317 */ | |
| 318 static struct { | |
| 319 int err; | |
| 320 const char* msg; | |
| 321 } const error_messages[] = { | |
| 322 { 100, "Bad request" }, | |
| 323 { 101, "Protocol mismatch" }, | |
| 324 { 102, "Resource failure" }, | |
| 325 { 103, "Internal error" }, | |
| 326 { 104, "Permission denied" }, | |
| 327 }; | |
| 328 | |
| 329 /* | |
| 330 * Lookup the given error code and return the appropriate | |
| 331 * message. If not found return NULL. | |
| 332 */ | |
| 333 static const char* translate_error(int err) { | |
| 334 int table_size = sizeof(error_messages) / sizeof(error_messages[0]); | |
| 335 int i; | |
| 336 | |
| 337 for (i=0; i<table_size; i++) { | |
| 338 if (err == error_messages[i].err) { | |
| 339 return error_messages[i].msg; | |
| 340 } | |
| 341 } | |
| 342 return NULL; | |
| 343 } | |
| 344 | |
| 345 /* | |
| 346 * Current protocol version | |
| 347 */ | |
| 348 static const char* PROTOCOL_VERSION = "1"; | |
| 349 | |
| 350 #define RES_BUF_SIZE 128 | |
| 351 | |
| 352 /* | |
| 353 * Enqueue attach-on-demand command to the given JVM | |
| 354 */ | |
| 355 static | |
| 356 int enqueue_command(jvm_t* jvm, const char* cstr, int arg_count, const char** args) { | |
| 357 size_t size; | |
| 358 door_arg_t door_args; | |
| 359 char res_buffer[RES_BUF_SIZE]; | |
| 360 int rc, i; | |
| 361 char* buf = NULL; | |
| 362 int result = -1; | |
| 363 | |
| 364 /* | |
| 365 * First we get the command string and create the start of the | |
| 366 * argument string to send to the target VM: | |
| 367 * <ver>\0<cmd>\0 | |
| 368 */ | |
| 369 if (cstr == NULL) { | |
| 370 print_debug("command name is NULL\n"); | |
| 371 goto quit; | |
| 372 } | |
| 373 size = strlen(PROTOCOL_VERSION) + strlen(cstr) + 2; | |
| 374 buf = (char*)malloc(size); | |
| 375 if (buf != NULL) { | |
| 376 char* pos = buf; | |
| 377 strcpy(buf, PROTOCOL_VERSION); | |
| 378 pos += strlen(PROTOCOL_VERSION)+1; | |
| 379 strcpy(pos, cstr); | |
| 380 } else { | |
| 381 set_jvm_error(JVM_ERR_OUT_OF_MEMORY); | |
| 382 print_debug("malloc failed at %d in %s\n", __LINE__, __FILE__); | |
| 383 goto quit; | |
| 384 } | |
| 385 | |
| 386 /* | |
| 387 * Next we iterate over the arguments and extend the buffer | |
| 388 * to include them. | |
| 389 */ | |
| 390 for (i=0; i<arg_count; i++) { | |
| 391 cstr = args[i]; | |
| 392 if (cstr != NULL) { | |
| 393 size_t len = strlen(cstr); | |
| 394 char* newbuf = (char*)realloc(buf, size+len+1); | |
| 395 if (newbuf == NULL) { | |
| 396 set_jvm_error(JVM_ERR_OUT_OF_MEMORY); | |
| 397 print_debug("realloc failed in %s at %d\n", __FILE__, __LINE__); | |
| 398 goto quit; | |
| 399 } | |
| 400 buf = newbuf; | |
| 401 strcpy(buf+size, cstr); | |
| 402 size += len+1; | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 /* | |
| 407 * The arguments to the door function are in 'buf' so we now | |
| 408 * do the door call | |
| 409 */ | |
| 410 door_args.data_ptr = buf; | |
| 411 door_args.data_size = size; | |
| 412 door_args.desc_ptr = NULL; | |
| 413 door_args.desc_num = 0; | |
| 414 door_args.rbuf = (char*)&res_buffer; | |
| 415 door_args.rsize = sizeof(res_buffer); | |
| 416 | |
| 417 RESTARTABLE(door_call(jvm->door_fd, &door_args), rc); | |
| 418 | |
| 419 /* | |
| 420 * door_call failed | |
| 421 */ | |
| 422 if (rc == -1) { | |
| 423 print_debug("door_call failed\n"); | |
| 424 } else { | |
| 425 /* | |
| 426 * door_call succeeded but the call didn't return the the expected jint. | |
| 427 */ | |
| 428 if (door_args.data_size < sizeof(int)) { | |
| 429 print_debug("Enqueue error - reason unknown as result is truncated!"); | |
| 430 } else { | |
| 431 int* res = (int*)(door_args.data_ptr); | |
| 432 if (*res != 0) { | |
| 433 const char* msg = translate_error(*res); | |
| 434 if (msg == NULL) { | |
| 435 print_debug("Unable to enqueue command to target VM: %d\n", *res); | |
| 436 } else { | |
| 437 print_debug("Unable to enqueue command to target VM: %s\n", msg); | |
| 438 } | |
| 439 } else { | |
| 440 /* | |
| 441 * The door call should return a file descriptor to one end of | |
| 442 * a socket pair | |
| 443 */ | |
| 444 if ((door_args.desc_ptr != NULL) && | |
| 445 (door_args.desc_num == 1) && | |
| 446 (door_args.desc_ptr->d_attributes & DOOR_DESCRIPTOR)) { | |
| 447 result = door_args.desc_ptr->d_data.d_desc.d_descriptor; | |
| 448 } else { | |
| 449 print_debug("Reply from enqueue missing descriptor!\n"); | |
| 450 } | |
| 451 } | |
| 452 } | |
| 453 } | |
| 454 | |
| 455 quit: | |
| 456 if (buf) free(buf); | |
| 457 return result; | |
| 458 } | |
| 459 | |
| 460 /* read status code for a door command */ | |
| 461 static int read_status(int fd) { | |
| 462 char ch, buf[16]; | |
| 463 int index = 0; | |
| 464 | |
| 465 while (1) { | |
| 466 if (file_read(fd, &ch, sizeof(ch)) != sizeof(ch)) { | |
| 467 set_jvm_error(JVM_ERR_DOOR_CANT_READ_STATUS); | |
| 468 print_debug("door cmd status: read status failed\n"); | |
| 469 return -1; | |
| 470 } | |
| 471 buf[index++] = ch; | |
| 472 if (ch == '\n') { | |
| 473 buf[index - 1] = '\0'; | |
| 474 return atoi(buf); | |
| 475 } | |
| 476 if (index == sizeof(buf)) { | |
| 477 set_jvm_error(JVM_ERR_DOOR_CANT_READ_STATUS); | |
| 478 print_debug("door cmd status: read status overflow\n"); | |
| 479 return -1; | |
| 480 } | |
| 481 } | |
| 482 } | |
| 483 | |
| 484 static const char* ENABLE_DPROBES_CMD = "enabledprobes"; | |
| 485 | |
| 486 /* enable one or more DTrace probes for a given JVM */ | |
| 487 int jvm_enable_dtprobes(jvm_t* jvm, int num_probe_types, const char** probe_types) { | |
| 488 int fd, status = 0; | |
| 489 char ch; | |
| 490 const char* args[1]; | |
| 491 char buf[16]; | |
| 492 int probe_type = 0, index; | |
| 493 int count = 0; | |
| 494 | |
| 495 if (jvm == NULL) { | |
| 496 set_jvm_error(JVM_ERR_NULL_PARAM); | |
| 497 print_debug("jvm_t* is NULL\n"); | |
| 498 return -1; | |
| 499 } | |
| 500 | |
| 501 if (num_probe_types == 0 || probe_types == NULL || | |
| 502 probe_types[0] == NULL) { | |
| 503 set_jvm_error(JVM_ERR_INVALID_PARAM); | |
| 504 print_debug("invalid probe type argument(s)\n"); | |
| 505 return -1; | |
| 506 } | |
| 507 | |
| 508 for (index = 0; index < num_probe_types; index++) { | |
| 509 const char* p = probe_types[index]; | |
| 510 if (strcmp(p, JVM_DTPROBE_OBJECT_ALLOC) == 0) { | |
| 511 probe_type |= DTRACE_ALLOC_PROBES; | |
| 512 count++; | |
| 513 } else if (strcmp(p, JVM_DTPROBE_METHOD_ENTRY) == 0 || | |
| 514 strcmp(p, JVM_DTPROBE_METHOD_RETURN) == 0) { | |
| 515 probe_type |= DTRACE_METHOD_PROBES; | |
| 516 count++; | |
| 517 } else if (strcmp(p, JVM_DTPROBE_MONITOR_ENTER) == 0 || | |
| 518 strcmp(p, JVM_DTPROBE_MONITOR_ENTERED) == 0 || | |
| 519 strcmp(p, JVM_DTPROBE_MONITOR_EXIT) == 0 || | |
| 520 strcmp(p, JVM_DTPROBE_MONITOR_WAIT) == 0 || | |
| 521 strcmp(p, JVM_DTPROBE_MONITOR_WAITED) == 0 || | |
| 522 strcmp(p, JVM_DTPROBE_MONITOR_NOTIFY) == 0 || | |
| 523 strcmp(p, JVM_DTPROBE_MONITOR_NOTIFYALL) == 0) { | |
| 524 probe_type |= DTRACE_MONITOR_PROBES; | |
| 525 count++; | |
| 526 } else if (strcmp(p, JVM_DTPROBE_ALL) == 0) { | |
| 527 probe_type |= DTRACE_ALL_PROBES; | |
| 528 count++; | |
| 529 } | |
| 530 } | |
| 531 | |
| 532 if (count == 0) { | |
| 533 return count; | |
| 534 } | |
| 535 sprintf(buf, "%d", probe_type); | |
| 536 args[0] = buf; | |
| 537 | |
| 538 fd = enqueue_command(jvm, ENABLE_DPROBES_CMD, 1, args); | |
| 539 if (fd < 0) { | |
| 540 set_jvm_error(JVM_ERR_DOOR_CMD_SEND); | |
| 541 return -1; | |
| 542 } | |
| 543 | |
| 544 status = read_status(fd); | |
| 545 // non-zero status is error | |
| 546 if (status) { | |
| 547 set_jvm_error(JVM_ERR_DOOR_CMD_STATUS); | |
| 548 print_debug("%s command failed (status: %d) in target JVM\n", | |
| 549 ENABLE_DPROBES_CMD, status); | |
| 550 file_close(fd); | |
| 551 return -1; | |
| 552 } | |
| 553 // read from stream until EOF | |
| 554 while (file_read(fd, &ch, sizeof(ch)) == sizeof(ch)) { | |
| 555 if (libjvm_dtrace_debug) { | |
| 556 printf("%c", ch); | |
| 557 } | |
| 558 } | |
| 559 | |
| 560 file_close(fd); | |
| 561 clear_jvm_error(); | |
| 562 return count; | |
| 563 } |