1 /* 2 * Copyright (c) 1999, 2014, 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 "utilities/globalDefinitions.hpp" 26 #include "prims/jvm.h" 27 #include "runtime/frame.inline.hpp" 28 #include "runtime/interfaceSupport.hpp" 29 #include "runtime/os.hpp" 30 #include "utilities/vmError.hpp" 31 32 #include <signal.h> 33 #include <unistd.h> 34 #include <sys/resource.h> 35 #include <sys/utsname.h> 36 #include <pthread.h> 37 #include <signal.h> 38 39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 40 41 // Todo: provide a os::get_max_process_id() or similar. Number of processes 42 // may have been configured, can be read more accurately from proc fs etc. 43 #ifndef MAX_PID 44 #define MAX_PID INT_MAX 45 #endif 46 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID) 47 48 int os::get_native_stack(address* stack, int frames, int toSkip) { 49 #ifdef _NMT_NOINLINE_ 50 toSkip++; 51 #endif 52 53 int frame_idx = 0; 54 int num_of_frames; // number of frames captured 55 frame fr = os::current_frame(); 56 while (fr.pc() && frame_idx < frames) { 57 if (toSkip > 0) { 58 toSkip --; 59 } else { 60 stack[frame_idx ++] = fr.pc(); 61 } 62 if (fr.fp() == NULL || os::is_first_C_frame(&fr) 63 ||fr.sender_pc() == NULL || fr.cb() != NULL) break; 64 65 if (fr.sender_pc() && !os::is_first_C_frame(&fr)) { 66 fr = os::get_sender_for_C_frame(&fr); 67 } else { 68 break; 69 } 70 } 71 num_of_frames = frame_idx; 72 for (; frame_idx < frames; frame_idx ++) { 73 stack[frame_idx] = NULL; 74 } 75 76 return num_of_frames; 77 } 78 79 80 bool os::unsetenv(const char* name) { 81 assert(name != NULL, "Null pointer"); 82 return (::unsetenv(name) == 0); 83 } 84 85 int os::get_last_error() { 86 return errno; 87 } 88 89 bool os::is_debugger_attached() { 90 // not implemented 91 return false; 92 } 93 94 void os::wait_for_keypress_at_exit(void) { 95 // don't do anything on posix platforms 96 return; 97 } 98 99 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED, 100 // so on posix, unmap the section at the start and at the end of the chunk that we mapped 101 // rather than unmapping and remapping the whole chunk to get requested alignment. 102 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 103 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 104 "Alignment must be a multiple of allocation granularity (page size)"); 105 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 106 107 size_t extra_size = size + alignment; 108 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 109 110 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 111 112 if (extra_base == NULL) { 113 return NULL; 114 } 115 116 // Do manual alignment 117 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 118 119 // [ | | ] 120 // ^ extra_base 121 // ^ extra_base + begin_offset == aligned_base 122 // extra_base + begin_offset + size ^ 123 // extra_base + extra_size ^ 124 // |<>| == begin_offset 125 // end_offset == |<>| 126 size_t begin_offset = aligned_base - extra_base; 127 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); 128 129 if (begin_offset > 0) { 130 os::release_memory(extra_base, begin_offset); 131 } 132 133 if (end_offset > 0) { 134 os::release_memory(extra_base + begin_offset + size, end_offset); 135 } 136 137 return aligned_base; 138 } 139 140 void os::Posix::print_load_average(outputStream* st) { 141 st->print("load average:"); 142 double loadavg[3]; 143 os::loadavg(loadavg, 3); 144 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 145 st->cr(); 146 } 147 148 void os::Posix::print_rlimit_info(outputStream* st) { 149 st->print("rlimit:"); 150 struct rlimit rlim; 151 152 st->print(" STACK "); 153 getrlimit(RLIMIT_STACK, &rlim); 154 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 155 else st->print("%uk", rlim.rlim_cur >> 10); 156 157 st->print(", CORE "); 158 getrlimit(RLIMIT_CORE, &rlim); 159 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 160 else st->print("%uk", rlim.rlim_cur >> 10); 161 162 // Isn't there on solaris 163 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) 164 st->print(", NPROC "); 165 getrlimit(RLIMIT_NPROC, &rlim); 166 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 167 else st->print("%d", rlim.rlim_cur); 168 #endif 169 170 st->print(", NOFILE "); 171 getrlimit(RLIMIT_NOFILE, &rlim); 172 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 173 else st->print("%d", rlim.rlim_cur); 174 175 st->print(", AS "); 176 getrlimit(RLIMIT_AS, &rlim); 177 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 178 else st->print("%uk", rlim.rlim_cur >> 10); 179 st->cr(); 180 } 181 182 void os::Posix::print_uname_info(outputStream* st) { 183 // kernel 184 st->print("uname:"); 185 struct utsname name; 186 uname(&name); 187 st->print("%s ", name.sysname); 188 #ifdef ASSERT 189 st->print("%s ", name.nodename); 190 #endif 191 st->print("%s ", name.release); 192 st->print("%s ", name.version); 193 st->print("%s", name.machine); 194 st->cr(); 195 } 196 197 bool os::has_allocatable_memory_limit(julong* limit) { 198 struct rlimit rlim; 199 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); 200 // if there was an error when calling getrlimit, assume that there is no limitation 201 // on virtual memory. 202 bool result; 203 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { 204 result = false; 205 } else { 206 *limit = (julong)rlim.rlim_cur; 207 result = true; 208 } 209 #ifdef _LP64 210 return result; 211 #else 212 // arbitrary virtual space limit for 32 bit Unices found by testing. If 213 // getrlimit above returned a limit, bound it with this limit. Otherwise 214 // directly use it. 215 const julong max_virtual_limit = (julong)3800*M; 216 if (result) { 217 *limit = MIN2(*limit, max_virtual_limit); 218 } else { 219 *limit = max_virtual_limit; 220 } 221 222 // bound by actually allocatable memory. The algorithm uses two bounds, an 223 // upper and a lower limit. The upper limit is the current highest amount of 224 // memory that could not be allocated, the lower limit is the current highest 225 // amount of memory that could be allocated. 226 // The algorithm iteratively refines the result by halving the difference 227 // between these limits, updating either the upper limit (if that value could 228 // not be allocated) or the lower limit (if the that value could be allocated) 229 // until the difference between these limits is "small". 230 231 // the minimum amount of memory we care about allocating. 232 const julong min_allocation_size = M; 233 234 julong upper_limit = *limit; 235 236 // first check a few trivial cases 237 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { 238 *limit = upper_limit; 239 } else if (!is_allocatable(min_allocation_size)) { 240 // we found that not even min_allocation_size is allocatable. Return it 241 // anyway. There is no point to search for a better value any more. 242 *limit = min_allocation_size; 243 } else { 244 // perform the binary search. 245 julong lower_limit = min_allocation_size; 246 while ((upper_limit - lower_limit) > min_allocation_size) { 247 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; 248 temp_limit = align_size_down_(temp_limit, min_allocation_size); 249 if (is_allocatable(temp_limit)) { 250 lower_limit = temp_limit; 251 } else { 252 upper_limit = temp_limit; 253 } 254 } 255 *limit = lower_limit; 256 } 257 return true; 258 #endif 259 } 260 261 const char* os::get_current_directory(char *buf, size_t buflen) { 262 return getcwd(buf, buflen); 263 } 264 265 FILE* os::open(int fd, const char* mode) { 266 return ::fdopen(fd, mode); 267 } 268 269 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 270 // which is used to find statically linked in agents. 271 // Parameters: 272 // sym_name: Symbol in library we are looking for 273 // lib_name: Name of library to look in, NULL for shared libs. 274 // is_absolute_path == true if lib_name is absolute path to agent 275 // such as "/a/b/libL.so" 276 // == false if only the base name of the library is passed in 277 // such as "L" 278 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 279 bool is_absolute_path) { 280 char *agent_entry_name; 281 size_t len; 282 size_t name_len; 283 size_t prefix_len = strlen(JNI_LIB_PREFIX); 284 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 285 const char *start; 286 287 if (lib_name != NULL) { 288 len = name_len = strlen(lib_name); 289 if (is_absolute_path) { 290 // Need to strip path, prefix and suffix 291 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 292 lib_name = ++start; 293 } 294 if (len <= (prefix_len + suffix_len)) { 295 return NULL; 296 } 297 lib_name += prefix_len; 298 name_len = strlen(lib_name) - suffix_len; 299 } 300 } 301 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 302 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 303 if (agent_entry_name == NULL) { 304 return NULL; 305 } 306 strcpy(agent_entry_name, sym_name); 307 if (lib_name != NULL) { 308 strcat(agent_entry_name, "_"); 309 strncat(agent_entry_name, lib_name, name_len); 310 } 311 return agent_entry_name; 312 } 313 314 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 315 assert(thread == Thread::current(), "thread consistency check"); 316 317 ParkEvent * const slp = thread->_SleepEvent ; 318 slp->reset() ; 319 OrderAccess::fence() ; 320 321 if (interruptible) { 322 jlong prevtime = javaTimeNanos(); 323 324 for (;;) { 325 if (os::is_interrupted(thread, true)) { 326 return OS_INTRPT; 327 } 328 329 jlong newtime = javaTimeNanos(); 330 331 if (newtime - prevtime < 0) { 332 // time moving backwards, should only happen if no monotonic clock 333 // not a guarantee() because JVM should not abort on kernel/glibc bugs 334 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected in os::sleep(interruptible)"); 335 } else { 336 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 337 } 338 339 if (millis <= 0) { 340 return OS_OK; 341 } 342 343 prevtime = newtime; 344 345 { 346 assert(thread->is_Java_thread(), "sanity check"); 347 JavaThread *jt = (JavaThread *) thread; 348 ThreadBlockInVM tbivm(jt); 349 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 350 351 jt->set_suspend_equivalent(); 352 // cleared by handle_special_suspend_equivalent_condition() or 353 // java_suspend_self() via check_and_wait_while_suspended() 354 355 slp->park(millis); 356 357 // were we externally suspended while we were waiting? 358 jt->check_and_wait_while_suspended(); 359 } 360 } 361 } else { 362 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 363 jlong prevtime = javaTimeNanos(); 364 365 for (;;) { 366 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 367 // the 1st iteration ... 368 jlong newtime = javaTimeNanos(); 369 370 if (newtime - prevtime < 0) { 371 // time moving backwards, should only happen if no monotonic clock 372 // not a guarantee() because JVM should not abort on kernel/glibc bugs 373 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected on os::sleep(!interruptible)"); 374 } else { 375 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 376 } 377 378 if (millis <= 0) break ; 379 380 prevtime = newtime; 381 slp->park(millis); 382 } 383 return OS_OK ; 384 } 385 } 386 387 //////////////////////////////////////////////////////////////////////////////// 388 // interrupt support 389 390 void os::interrupt(Thread* thread) { 391 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 392 "possibility of dangling Thread pointer"); 393 394 OSThread* osthread = thread->osthread(); 395 396 if (!osthread->interrupted()) { 397 osthread->set_interrupted(true); 398 // More than one thread can get here with the same value of osthread, 399 // resulting in multiple notifications. We do, however, want the store 400 // to interrupted() to be visible to other threads before we execute unpark(). 401 OrderAccess::fence(); 402 ParkEvent * const slp = thread->_SleepEvent ; 403 if (slp != NULL) slp->unpark() ; 404 } 405 406 // For JSR166. Unpark even if interrupt status already was set 407 if (thread->is_Java_thread()) 408 ((JavaThread*)thread)->parker()->unpark(); 409 410 ParkEvent * ev = thread->_ParkEvent ; 411 if (ev != NULL) ev->unpark() ; 412 413 } 414 415 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 416 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 417 "possibility of dangling Thread pointer"); 418 419 OSThread* osthread = thread->osthread(); 420 421 bool interrupted = osthread->interrupted(); 422 423 // NOTE that since there is no "lock" around the interrupt and 424 // is_interrupted operations, there is the possibility that the 425 // interrupted flag (in osThread) will be "false" but that the 426 // low-level events will be in the signaled state. This is 427 // intentional. The effect of this is that Object.wait() and 428 // LockSupport.park() will appear to have a spurious wakeup, which 429 // is allowed and not harmful, and the possibility is so rare that 430 // it is not worth the added complexity to add yet another lock. 431 // For the sleep event an explicit reset is performed on entry 432 // to os::sleep, so there is no early return. It has also been 433 // recommended not to put the interrupted flag into the "event" 434 // structure because it hides the issue. 435 if (interrupted && clear_interrupted) { 436 osthread->set_interrupted(false); 437 // consider thread->_SleepEvent->reset() ... optional optimization 438 } 439 440 return interrupted; 441 } 442 443 // Returned string is a constant. For unknown signals "UNKNOWN" is returned. 444 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { 445 446 static const struct { 447 int sig; const char* name; 448 } 449 info[] = 450 { 451 { SIGABRT, "SIGABRT" }, 452 #ifdef SIGAIO 453 { SIGAIO, "SIGAIO" }, 454 #endif 455 { SIGALRM, "SIGALRM" }, 456 #ifdef SIGALRM1 457 { SIGALRM1, "SIGALRM1" }, 458 #endif 459 { SIGBUS, "SIGBUS" }, 460 #ifdef SIGCANCEL 461 { SIGCANCEL, "SIGCANCEL" }, 462 #endif 463 { SIGCHLD, "SIGCHLD" }, 464 #ifdef SIGCLD 465 { SIGCLD, "SIGCLD" }, 466 #endif 467 { SIGCONT, "SIGCONT" }, 468 #ifdef SIGCPUFAIL 469 { SIGCPUFAIL, "SIGCPUFAIL" }, 470 #endif 471 #ifdef SIGDANGER 472 { SIGDANGER, "SIGDANGER" }, 473 #endif 474 #ifdef SIGDIL 475 { SIGDIL, "SIGDIL" }, 476 #endif 477 #ifdef SIGEMT 478 { SIGEMT, "SIGEMT" }, 479 #endif 480 { SIGFPE, "SIGFPE" }, 481 #ifdef SIGFREEZE 482 { SIGFREEZE, "SIGFREEZE" }, 483 #endif 484 #ifdef SIGGFAULT 485 { SIGGFAULT, "SIGGFAULT" }, 486 #endif 487 #ifdef SIGGRANT 488 { SIGGRANT, "SIGGRANT" }, 489 #endif 490 { SIGHUP, "SIGHUP" }, 491 { SIGILL, "SIGILL" }, 492 { SIGINT, "SIGINT" }, 493 #ifdef SIGIO 494 { SIGIO, "SIGIO" }, 495 #endif 496 #ifdef SIGIOINT 497 { SIGIOINT, "SIGIOINT" }, 498 #endif 499 #ifdef SIGIOT 500 // SIGIOT is there for BSD compatibility, but on most Unices just a 501 // synonym for SIGABRT. The result should be "SIGABRT", not 502 // "SIGIOT". 503 #if (SIGIOT != SIGABRT ) 504 { SIGIOT, "SIGIOT" }, 505 #endif 506 #endif 507 #ifdef SIGKAP 508 { SIGKAP, "SIGKAP" }, 509 #endif 510 { SIGKILL, "SIGKILL" }, 511 #ifdef SIGLOST 512 { SIGLOST, "SIGLOST" }, 513 #endif 514 #ifdef SIGLWP 515 { SIGLWP, "SIGLWP" }, 516 #endif 517 #ifdef SIGLWPTIMER 518 { SIGLWPTIMER, "SIGLWPTIMER" }, 519 #endif 520 #ifdef SIGMIGRATE 521 { SIGMIGRATE, "SIGMIGRATE" }, 522 #endif 523 #ifdef SIGMSG 524 { SIGMSG, "SIGMSG" }, 525 #endif 526 { SIGPIPE, "SIGPIPE" }, 527 #ifdef SIGPOLL 528 { SIGPOLL, "SIGPOLL" }, 529 #endif 530 #ifdef SIGPRE 531 { SIGPRE, "SIGPRE" }, 532 #endif 533 { SIGPROF, "SIGPROF" }, 534 #ifdef SIGPTY 535 { SIGPTY, "SIGPTY" }, 536 #endif 537 #ifdef SIGPWR 538 { SIGPWR, "SIGPWR" }, 539 #endif 540 { SIGQUIT, "SIGQUIT" }, 541 #ifdef SIGRECONFIG 542 { SIGRECONFIG, "SIGRECONFIG" }, 543 #endif 544 #ifdef SIGRECOVERY 545 { SIGRECOVERY, "SIGRECOVERY" }, 546 #endif 547 #ifdef SIGRESERVE 548 { SIGRESERVE, "SIGRESERVE" }, 549 #endif 550 #ifdef SIGRETRACT 551 { SIGRETRACT, "SIGRETRACT" }, 552 #endif 553 #ifdef SIGSAK 554 { SIGSAK, "SIGSAK" }, 555 #endif 556 { SIGSEGV, "SIGSEGV" }, 557 #ifdef SIGSOUND 558 { SIGSOUND, "SIGSOUND" }, 559 #endif 560 { SIGSTOP, "SIGSTOP" }, 561 { SIGSYS, "SIGSYS" }, 562 #ifdef SIGSYSERROR 563 { SIGSYSERROR, "SIGSYSERROR" }, 564 #endif 565 #ifdef SIGTALRM 566 { SIGTALRM, "SIGTALRM" }, 567 #endif 568 { SIGTERM, "SIGTERM" }, 569 #ifdef SIGTHAW 570 { SIGTHAW, "SIGTHAW" }, 571 #endif 572 { SIGTRAP, "SIGTRAP" }, 573 #ifdef SIGTSTP 574 { SIGTSTP, "SIGTSTP" }, 575 #endif 576 { SIGTTIN, "SIGTTIN" }, 577 { SIGTTOU, "SIGTTOU" }, 578 #ifdef SIGURG 579 { SIGURG, "SIGURG" }, 580 #endif 581 { SIGUSR1, "SIGUSR1" }, 582 { SIGUSR2, "SIGUSR2" }, 583 #ifdef SIGVIRT 584 { SIGVIRT, "SIGVIRT" }, 585 #endif 586 { SIGVTALRM, "SIGVTALRM" }, 587 #ifdef SIGWAITING 588 { SIGWAITING, "SIGWAITING" }, 589 #endif 590 #ifdef SIGWINCH 591 { SIGWINCH, "SIGWINCH" }, 592 #endif 593 #ifdef SIGWINDOW 594 { SIGWINDOW, "SIGWINDOW" }, 595 #endif 596 { SIGXCPU, "SIGXCPU" }, 597 { SIGXFSZ, "SIGXFSZ" }, 598 #ifdef SIGXRES 599 { SIGXRES, "SIGXRES" }, 600 #endif 601 { -1, NULL } 602 }; 603 604 const char* ret = NULL; 605 606 #ifdef SIGRTMIN 607 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { 608 if (sig == SIGRTMIN) { 609 ret = "SIGRTMIN"; 610 } else if (sig == SIGRTMAX) { 611 ret = "SIGRTMAX"; 612 } else { 613 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); 614 return out; 615 } 616 } 617 #endif 618 619 if (sig > 0) { 620 for (int idx = 0; info[idx].sig != -1; idx ++) { 621 if (info[idx].sig == sig) { 622 ret = info[idx].name; 623 break; 624 } 625 } 626 } 627 628 if (!ret) { 629 if (!is_valid_signal(sig)) { 630 ret = "INVALID"; 631 } else { 632 ret = "UNKNOWN"; 633 } 634 } 635 636 jio_snprintf(out, outlen, ret); 637 return out; 638 } 639 640 // Returns true if signal number is valid. 641 bool os::Posix::is_valid_signal(int sig) { 642 // MacOS not really POSIX compliant: sigaddset does not return 643 // an error for invalid signal numbers. However, MacOS does not 644 // support real time signals and simply seems to have just 33 645 // signals with no holes in the signal range. 646 #ifdef __APPLE__ 647 return sig >= 1 && sig < NSIG; 648 #else 649 // Use sigaddset to check for signal validity. 650 sigset_t set; 651 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { 652 return false; 653 } 654 return true; 655 #endif 656 } 657 658 #define NUM_IMPORTANT_SIGS 32 659 // Returns one-line short description of a signal set in a user provided buffer. 660 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { 661 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); 662 // Note: for shortness, just print out the first 32. That should 663 // cover most of the useful ones, apart from realtime signals. 664 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { 665 const int rc = sigismember(set, sig); 666 if (rc == -1 && errno == EINVAL) { 667 buffer[sig-1] = '?'; 668 } else { 669 buffer[sig-1] = rc == 0 ? '0' : '1'; 670 } 671 } 672 buffer[NUM_IMPORTANT_SIGS] = 0; 673 return buffer; 674 } 675 676 // Prints one-line description of a signal set. 677 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { 678 char buf[NUM_IMPORTANT_SIGS + 1]; 679 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); 680 st->print("%s", buf); 681 } 682 683 // Writes one-line description of a combination of sigaction.sa_flags into a user 684 // provided buffer. Returns that buffer. 685 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { 686 char* p = buffer; 687 size_t remaining = size; 688 bool first = true; 689 int idx = 0; 690 691 assert(buffer, "invalid argument"); 692 693 if (size == 0) { 694 return buffer; 695 } 696 697 strncpy(buffer, "none", size); 698 699 const struct { 700 int i; 701 const char* s; 702 } flaginfo [] = { 703 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, 704 { SA_ONSTACK, "SA_ONSTACK" }, 705 { SA_RESETHAND, "SA_RESETHAND" }, 706 { SA_RESTART, "SA_RESTART" }, 707 { SA_SIGINFO, "SA_SIGINFO" }, 708 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, 709 { SA_NODEFER, "SA_NODEFER" }, 710 #ifdef AIX 711 { SA_ONSTACK, "SA_ONSTACK" }, 712 { SA_OLDSTYLE, "SA_OLDSTYLE" }, 713 #endif 714 { 0, NULL } 715 }; 716 717 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { 718 if (flags & flaginfo[idx].i) { 719 if (first) { 720 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); 721 first = false; 722 } else { 723 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); 724 } 725 const size_t len = strlen(p); 726 p += len; 727 remaining -= len; 728 } 729 } 730 731 buffer[size - 1] = '\0'; 732 733 return buffer; 734 } 735 736 // Prints one-line description of a combination of sigaction.sa_flags. 737 void os::Posix::print_sa_flags(outputStream* st, int flags) { 738 char buffer[0x100]; 739 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); 740 st->print("%s", buffer); 741 } 742 743 // Helper function for os::Posix::print_siginfo_...(): 744 // return a textual description for signal code. 745 struct enum_sigcode_desc_t { 746 const char* s_name; 747 const char* s_desc; 748 }; 749 750 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { 751 752 const struct { 753 int sig; int code; const char* s_code; const char* s_desc; 754 } t1 [] = { 755 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, 756 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, 757 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, 758 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, 759 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, 760 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, 761 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, 762 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, 763 #if defined(IA64) && defined(LINUX) 764 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, 765 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, 766 #endif 767 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, 768 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, 769 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, 770 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, 771 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, 772 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, 773 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, 774 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, 775 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, 776 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, 777 #ifdef AIX 778 // no explanation found what keyerr would be 779 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, 780 #endif 781 #if defined(IA64) && !defined(AIX) 782 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, 783 #endif 784 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, 785 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, 786 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, 787 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, 788 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, 789 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, 790 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, 791 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, 792 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, 793 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, 794 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, 795 #ifdef SIGPOLL 796 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, 797 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, 798 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, 799 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, 800 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, 801 #endif 802 { -1, -1, NULL, NULL } 803 }; 804 805 // Codes valid in any signal context. 806 const struct { 807 int code; const char* s_code; const char* s_desc; 808 } t2 [] = { 809 { SI_USER, "SI_USER", "Signal sent by kill()." }, 810 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, 811 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, 812 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, 813 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, 814 // Linux specific 815 #ifdef SI_TKILL 816 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, 817 #endif 818 #ifdef SI_DETHREAD 819 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, 820 #endif 821 #ifdef SI_KERNEL 822 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, 823 #endif 824 #ifdef SI_SIGIO 825 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, 826 #endif 827 828 #ifdef AIX 829 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, 830 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, 831 #endif 832 833 #ifdef __sun 834 { SI_NOINFO, "SI_NOINFO", "No signal information" }, 835 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, 836 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, 837 #endif 838 839 { -1, NULL, NULL } 840 }; 841 842 const char* s_code = NULL; 843 const char* s_desc = NULL; 844 845 for (int i = 0; t1[i].sig != -1; i ++) { 846 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { 847 s_code = t1[i].s_code; 848 s_desc = t1[i].s_desc; 849 break; 850 } 851 } 852 853 if (s_code == NULL) { 854 for (int i = 0; t2[i].s_code != NULL; i ++) { 855 if (t2[i].code == si->si_code) { 856 s_code = t2[i].s_code; 857 s_desc = t2[i].s_desc; 858 } 859 } 860 } 861 862 if (s_code == NULL) { 863 out->s_name = "unknown"; 864 out->s_desc = "unknown"; 865 return false; 866 } 867 868 out->s_name = s_code; 869 out->s_desc = s_desc; 870 871 return true; 872 } 873 874 // A POSIX conform, platform-independend siginfo print routine. 875 // Short print out on one line. 876 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) { 877 char buf[20]; 878 os->print("siginfo: "); 879 880 if (!si) { 881 os->print("<null>"); 882 return; 883 } 884 885 // See print_siginfo_full() for details. 886 const int sig = si->si_signo; 887 888 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); 889 890 enum_sigcode_desc_t ed; 891 if (get_signal_code_description(si, &ed)) { 892 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); 893 } else { 894 os->print(", si_code: %d (unknown)", si->si_code); 895 } 896 897 if (si->si_errno) { 898 os->print(", si_errno: %d", si->si_errno); 899 } 900 901 const int me = (int) ::getpid(); 902 const int pid = (int) si->si_pid; 903 904 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { 905 if (IS_VALID_PID(pid) && pid != me) { 906 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid); 907 } 908 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || 909 sig == SIGTRAP || sig == SIGFPE) { 910 os->print(", si_addr: " PTR_FORMAT, si->si_addr); 911 #ifdef SIGPOLL 912 } else if (sig == SIGPOLL) { 913 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band); 914 #endif 915 } else if (sig == SIGCHLD) { 916 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status); 917 } 918 } 919 920 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 921 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 922 } 923 924 /* 925 * See the caveats for this class in os_posix.hpp 926 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this 927 * method and returns false. If none of the signals are raised, returns true. 928 * The callback is supposed to provide the method that should be protected. 929 */ 930 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 931 sigset_t saved_sig_mask; 932 933 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 934 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 935 "crash_protection already set?"); 936 937 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask 938 // since on at least some systems (OS X) siglongjmp will restore the mask 939 // for the process, not the thread 940 pthread_sigmask(0, NULL, &saved_sig_mask); 941 if (sigsetjmp(_jmpbuf, 0) == 0) { 942 // make sure we can see in the signal handler that we have crash protection 943 // installed 944 WatcherThread::watcher_thread()->set_crash_protection(this); 945 cb.call(); 946 // and clear the crash protection 947 WatcherThread::watcher_thread()->set_crash_protection(NULL); 948 return true; 949 } 950 // this happens when we siglongjmp() back 951 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); 952 WatcherThread::watcher_thread()->set_crash_protection(NULL); 953 return false; 954 } 955 956 void os::WatcherThreadCrashProtection::restore() { 957 assert(WatcherThread::watcher_thread()->has_crash_protection(), 958 "must have crash protection"); 959 960 siglongjmp(_jmpbuf, 1); 961 } 962 963 void os::WatcherThreadCrashProtection::check_crash_protection(int sig, 964 Thread* thread) { 965 966 if (thread != NULL && 967 thread->is_Watcher_thread() && 968 WatcherThread::watcher_thread()->has_crash_protection()) { 969 970 if (sig == SIGSEGV || sig == SIGBUS) { 971 WatcherThread::watcher_thread()->crash_protection()->restore(); 972 } 973 } 974 }