os_posix.cpp revision 6014:8a9bb7821e28
1/* 2* Copyright (c) 1999, 2013, 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/os.hpp" 29#include "utilities/vmError.hpp" 30 31#include <signal.h> 32#include <unistd.h> 33#include <sys/resource.h> 34#include <sys/utsname.h> 35#include <pthread.h> 36#include <signal.h> 37 38// Todo: provide a os::get_max_process_id() or similar. Number of processes 39// may have been configured, can be read more accurately from proc fs etc. 40#ifndef MAX_PID 41#define MAX_PID INT_MAX 42#endif 43#define IS_VALID_PID(p) (p > 0 && p < MAX_PID) 44 45// Check core dump limit and report possible place where core can be found 46void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 47 int n; 48 struct rlimit rlim; 49 bool success; 50 51 n = get_core_path(buffer, bufferSize); 52 53 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { 54 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); 55 success = true; 56 } else { 57 switch(rlim.rlim_cur) { 58 case RLIM_INFINITY: 59 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); 60 success = true; 61 break; 62 case 0: 63 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); 64 success = false; 65 break; 66 default: 67 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10)); 68 success = true; 69 break; 70 } 71 } 72 VMError::report_coredump_status(buffer, success); 73} 74 75address os::get_caller_pc(int n) { 76#ifdef _NMT_NOINLINE_ 77 n ++; 78#endif 79 frame fr = os::current_frame(); 80 while (n > 0 && fr.pc() && 81 !os::is_first_C_frame(&fr) && fr.sender_pc()) { 82 fr = os::get_sender_for_C_frame(&fr); 83 n --; 84 } 85 if (n == 0) { 86 return fr.pc(); 87 } else { 88 return NULL; 89 } 90} 91 92int os::get_last_error() { 93 return errno; 94} 95 96bool os::is_debugger_attached() { 97 // not implemented 98 return false; 99} 100 101void os::wait_for_keypress_at_exit(void) { 102 // don't do anything on posix platforms 103 return; 104} 105 106// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, 107// so on posix, unmap the section at the start and at the end of the chunk that we mapped 108// rather than unmapping and remapping the whole chunk to get requested alignment. 109char* os::reserve_memory_aligned(size_t size, size_t alignment) { 110 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 111 "Alignment must be a multiple of allocation granularity (page size)"); 112 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 113 114 size_t extra_size = size + alignment; 115 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 116 117 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 118 119 if (extra_base == NULL) { 120 return NULL; 121 } 122 123 // Do manual alignment 124 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 125 126 // [ | | ] 127 // ^ extra_base 128 // ^ extra_base + begin_offset == aligned_base 129 // extra_base + begin_offset + size ^ 130 // extra_base + extra_size ^ 131 // |<>| == begin_offset 132 // end_offset == |<>| 133 size_t begin_offset = aligned_base - extra_base; 134 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); 135 136 if (begin_offset > 0) { 137 os::release_memory(extra_base, begin_offset); 138 } 139 140 if (end_offset > 0) { 141 os::release_memory(extra_base + begin_offset + size, end_offset); 142 } 143 144 return aligned_base; 145} 146 147void os::Posix::print_load_average(outputStream* st) { 148 st->print("load average:"); 149 double loadavg[3]; 150 os::loadavg(loadavg, 3); 151 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 152 st->cr(); 153} 154 155void os::Posix::print_rlimit_info(outputStream* st) { 156 st->print("rlimit:"); 157 struct rlimit rlim; 158 159 st->print(" STACK "); 160 getrlimit(RLIMIT_STACK, &rlim); 161 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 162 else st->print("%uk", rlim.rlim_cur >> 10); 163 164 st->print(", CORE "); 165 getrlimit(RLIMIT_CORE, &rlim); 166 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 167 else st->print("%uk", rlim.rlim_cur >> 10); 168 169 // Isn't there on solaris 170#if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) 171 st->print(", NPROC "); 172 getrlimit(RLIMIT_NPROC, &rlim); 173 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 174 else st->print("%d", rlim.rlim_cur); 175#endif 176 177 st->print(", NOFILE "); 178 getrlimit(RLIMIT_NOFILE, &rlim); 179 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 180 else st->print("%d", rlim.rlim_cur); 181 182 st->print(", AS "); 183 getrlimit(RLIMIT_AS, &rlim); 184 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 185 else st->print("%uk", rlim.rlim_cur >> 10); 186 st->cr(); 187} 188 189void os::Posix::print_uname_info(outputStream* st) { 190 // kernel 191 st->print("uname:"); 192 struct utsname name; 193 uname(&name); 194 st->print(name.sysname); st->print(" "); 195 st->print(name.release); st->print(" "); 196 st->print(name.version); st->print(" "); 197 st->print(name.machine); 198 st->cr(); 199} 200 201bool os::has_allocatable_memory_limit(julong* limit) { 202 struct rlimit rlim; 203 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); 204 // if there was an error when calling getrlimit, assume that there is no limitation 205 // on virtual memory. 206 bool result; 207 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { 208 result = false; 209 } else { 210 *limit = (julong)rlim.rlim_cur; 211 result = true; 212 } 213#ifdef _LP64 214 return result; 215#else 216 // arbitrary virtual space limit for 32 bit Unices found by testing. If 217 // getrlimit above returned a limit, bound it with this limit. Otherwise 218 // directly use it. 219 const julong max_virtual_limit = (julong)3800*M; 220 if (result) { 221 *limit = MIN2(*limit, max_virtual_limit); 222 } else { 223 *limit = max_virtual_limit; 224 } 225 226 // bound by actually allocatable memory. The algorithm uses two bounds, an 227 // upper and a lower limit. The upper limit is the current highest amount of 228 // memory that could not be allocated, the lower limit is the current highest 229 // amount of memory that could be allocated. 230 // The algorithm iteratively refines the result by halving the difference 231 // between these limits, updating either the upper limit (if that value could 232 // not be allocated) or the lower limit (if the that value could be allocated) 233 // until the difference between these limits is "small". 234 235 // the minimum amount of memory we care about allocating. 236 const julong min_allocation_size = M; 237 238 julong upper_limit = *limit; 239 240 // first check a few trivial cases 241 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { 242 *limit = upper_limit; 243 } else if (!is_allocatable(min_allocation_size)) { 244 // we found that not even min_allocation_size is allocatable. Return it 245 // anyway. There is no point to search for a better value any more. 246 *limit = min_allocation_size; 247 } else { 248 // perform the binary search. 249 julong lower_limit = min_allocation_size; 250 while ((upper_limit - lower_limit) > min_allocation_size) { 251 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; 252 temp_limit = align_size_down_(temp_limit, min_allocation_size); 253 if (is_allocatable(temp_limit)) { 254 lower_limit = temp_limit; 255 } else { 256 upper_limit = temp_limit; 257 } 258 } 259 *limit = lower_limit; 260 } 261 return true; 262#endif 263} 264 265const char* os::get_current_directory(char *buf, size_t buflen) { 266 return getcwd(buf, buflen); 267} 268 269FILE* os::open(int fd, const char* mode) { 270 return ::fdopen(fd, mode); 271} 272 273// Builds a platform dependent Agent_OnLoad_<lib_name> function name 274// which is used to find statically linked in agents. 275// Parameters: 276// sym_name: Symbol in library we are looking for 277// lib_name: Name of library to look in, NULL for shared libs. 278// is_absolute_path == true if lib_name is absolute path to agent 279// such as "/a/b/libL.so" 280// == false if only the base name of the library is passed in 281// such as "L" 282char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 283 bool is_absolute_path) { 284 char *agent_entry_name; 285 size_t len; 286 size_t name_len; 287 size_t prefix_len = strlen(JNI_LIB_PREFIX); 288 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 289 const char *start; 290 291 if (lib_name != NULL) { 292 len = name_len = strlen(lib_name); 293 if (is_absolute_path) { 294 // Need to strip path, prefix and suffix 295 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 296 lib_name = ++start; 297 } 298 if (len <= (prefix_len + suffix_len)) { 299 return NULL; 300 } 301 lib_name += prefix_len; 302 name_len = strlen(lib_name) - suffix_len; 303 } 304 } 305 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 306 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 307 if (agent_entry_name == NULL) { 308 return NULL; 309 } 310 strcpy(agent_entry_name, sym_name); 311 if (lib_name != NULL) { 312 strcat(agent_entry_name, "_"); 313 strncat(agent_entry_name, lib_name, name_len); 314 } 315 return agent_entry_name; 316} 317 318// Returned string is a constant. For unknown signals "UNKNOWN" is returned. 319const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { 320 321 static const struct { 322 int sig; const char* name; 323 } 324 info[] = 325 { 326 { SIGABRT, "SIGABRT" }, 327#ifdef SIGAIO 328 { SIGAIO, "SIGAIO" }, 329#endif 330 { SIGALRM, "SIGALRM" }, 331#ifdef SIGALRM1 332 { SIGALRM1, "SIGALRM1" }, 333#endif 334 { SIGBUS, "SIGBUS" }, 335#ifdef SIGCANCEL 336 { SIGCANCEL, "SIGCANCEL" }, 337#endif 338 { SIGCHLD, "SIGCHLD" }, 339#ifdef SIGCLD 340 { SIGCLD, "SIGCLD" }, 341#endif 342 { SIGCONT, "SIGCONT" }, 343#ifdef SIGCPUFAIL 344 { SIGCPUFAIL, "SIGCPUFAIL" }, 345#endif 346#ifdef SIGDANGER 347 { SIGDANGER, "SIGDANGER" }, 348#endif 349#ifdef SIGDIL 350 { SIGDIL, "SIGDIL" }, 351#endif 352#ifdef SIGEMT 353 { SIGEMT, "SIGEMT" }, 354#endif 355 { SIGFPE, "SIGFPE" }, 356#ifdef SIGFREEZE 357 { SIGFREEZE, "SIGFREEZE" }, 358#endif 359#ifdef SIGGFAULT 360 { SIGGFAULT, "SIGGFAULT" }, 361#endif 362#ifdef SIGGRANT 363 { SIGGRANT, "SIGGRANT" }, 364#endif 365 { SIGHUP, "SIGHUP" }, 366 { SIGILL, "SIGILL" }, 367 { SIGINT, "SIGINT" }, 368#ifdef SIGIO 369 { SIGIO, "SIGIO" }, 370#endif 371#ifdef SIGIOINT 372 { SIGIOINT, "SIGIOINT" }, 373#endif 374#ifdef SIGIOT 375 // SIGIOT is there for BSD compatibility, but on most Unices just a 376 // synonym for SIGABRT. The result should be "SIGABRT", not 377 // "SIGIOT". 378 #if (SIGIOT != SIGABRT ) 379 { SIGIOT, "SIGIOT" }, 380 #endif 381#endif 382#ifdef SIGKAP 383 { SIGKAP, "SIGKAP" }, 384#endif 385 { SIGKILL, "SIGKILL" }, 386#ifdef SIGLOST 387 { SIGLOST, "SIGLOST" }, 388#endif 389#ifdef SIGLWP 390 { SIGLWP, "SIGLWP" }, 391#endif 392#ifdef SIGLWPTIMER 393 { SIGLWPTIMER, "SIGLWPTIMER" }, 394#endif 395#ifdef SIGMIGRATE 396 { SIGMIGRATE, "SIGMIGRATE" }, 397#endif 398#ifdef SIGMSG 399 { SIGMSG, "SIGMSG" }, 400#endif 401 { SIGPIPE, "SIGPIPE" }, 402#ifdef SIGPOLL 403 { SIGPOLL, "SIGPOLL" }, 404#endif 405#ifdef SIGPRE 406 { SIGPRE, "SIGPRE" }, 407#endif 408 { SIGPROF, "SIGPROF" }, 409#ifdef SIGPTY 410 { SIGPTY, "SIGPTY" }, 411#endif 412#ifdef SIGPWR 413 { SIGPWR, "SIGPWR" }, 414#endif 415 { SIGQUIT, "SIGQUIT" }, 416#ifdef SIGRECONFIG 417 { SIGRECONFIG, "SIGRECONFIG" }, 418#endif 419#ifdef SIGRECOVERY 420 { SIGRECOVERY, "SIGRECOVERY" }, 421#endif 422#ifdef SIGRESERVE 423 { SIGRESERVE, "SIGRESERVE" }, 424#endif 425#ifdef SIGRETRACT 426 { SIGRETRACT, "SIGRETRACT" }, 427#endif 428#ifdef SIGSAK 429 { SIGSAK, "SIGSAK" }, 430#endif 431 { SIGSEGV, "SIGSEGV" }, 432#ifdef SIGSOUND 433 { SIGSOUND, "SIGSOUND" }, 434#endif 435 { SIGSTOP, "SIGSTOP" }, 436 { SIGSYS, "SIGSYS" }, 437#ifdef SIGSYSERROR 438 { SIGSYSERROR, "SIGSYSERROR" }, 439#endif 440#ifdef SIGTALRM 441 { SIGTALRM, "SIGTALRM" }, 442#endif 443 { SIGTERM, "SIGTERM" }, 444#ifdef SIGTHAW 445 { SIGTHAW, "SIGTHAW" }, 446#endif 447 { SIGTRAP, "SIGTRAP" }, 448#ifdef SIGTSTP 449 { SIGTSTP, "SIGTSTP" }, 450#endif 451 { SIGTTIN, "SIGTTIN" }, 452 { SIGTTOU, "SIGTTOU" }, 453#ifdef SIGURG 454 { SIGURG, "SIGURG" }, 455#endif 456 { SIGUSR1, "SIGUSR1" }, 457 { SIGUSR2, "SIGUSR2" }, 458#ifdef SIGVIRT 459 { SIGVIRT, "SIGVIRT" }, 460#endif 461 { SIGVTALRM, "SIGVTALRM" }, 462#ifdef SIGWAITING 463 { SIGWAITING, "SIGWAITING" }, 464#endif 465#ifdef SIGWINCH 466 { SIGWINCH, "SIGWINCH" }, 467#endif 468#ifdef SIGWINDOW 469 { SIGWINDOW, "SIGWINDOW" }, 470#endif 471 { SIGXCPU, "SIGXCPU" }, 472 { SIGXFSZ, "SIGXFSZ" }, 473#ifdef SIGXRES 474 { SIGXRES, "SIGXRES" }, 475#endif 476 { -1, NULL } 477 }; 478 479 const char* ret = NULL; 480 481#ifdef SIGRTMIN 482 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { 483 if (sig == SIGRTMIN) { 484 ret = "SIGRTMIN"; 485 } else if (sig == SIGRTMAX) { 486 ret = "SIGRTMAX"; 487 } else { 488 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); 489 return out; 490 } 491 } 492#endif 493 494 if (sig > 0) { 495 for (int idx = 0; info[idx].sig != -1; idx ++) { 496 if (info[idx].sig == sig) { 497 ret = info[idx].name; 498 break; 499 } 500 } 501 } 502 503 if (!ret) { 504 if (!is_valid_signal(sig)) { 505 ret = "INVALID"; 506 } else { 507 ret = "UNKNOWN"; 508 } 509 } 510 511 jio_snprintf(out, outlen, ret); 512 return out; 513} 514 515// Returns true if signal number is valid. 516bool os::Posix::is_valid_signal(int sig) { 517 // MacOS not really POSIX compliant: sigaddset does not return 518 // an error for invalid signal numbers. However, MacOS does not 519 // support real time signals and simply seems to have just 33 520 // signals with no holes in the signal range. 521#ifdef __APPLE__ 522 return sig >= 1 && sig < NSIG; 523#else 524 // Use sigaddset to check for signal validity. 525 sigset_t set; 526 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { 527 return false; 528 } 529 return true; 530#endif 531} 532 533#define NUM_IMPORTANT_SIGS 32 534// Returns one-line short description of a signal set in a user provided buffer. 535const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { 536 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); 537 // Note: for shortness, just print out the first 32. That should 538 // cover most of the useful ones, apart from realtime signals. 539 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { 540 const int rc = sigismember(set, sig); 541 if (rc == -1 && errno == EINVAL) { 542 buffer[sig-1] = '?'; 543 } else { 544 buffer[sig-1] = rc == 0 ? '0' : '1'; 545 } 546 } 547 buffer[NUM_IMPORTANT_SIGS] = 0; 548 return buffer; 549} 550 551// Prints one-line description of a signal set. 552void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { 553 char buf[NUM_IMPORTANT_SIGS + 1]; 554 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); 555 st->print(buf); 556} 557 558// Writes one-line description of a combination of sigaction.sa_flags into a user 559// provided buffer. Returns that buffer. 560const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { 561 char* p = buffer; 562 size_t remaining = size; 563 bool first = true; 564 int idx = 0; 565 566 assert(buffer, "invalid argument"); 567 568 if (size == 0) { 569 return buffer; 570 } 571 572 strncpy(buffer, "none", size); 573 574 const struct { 575 int i; 576 const char* s; 577 } flaginfo [] = { 578 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, 579 { SA_ONSTACK, "SA_ONSTACK" }, 580 { SA_RESETHAND, "SA_RESETHAND" }, 581 { SA_RESTART, "SA_RESTART" }, 582 { SA_SIGINFO, "SA_SIGINFO" }, 583 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, 584 { SA_NODEFER, "SA_NODEFER" }, 585#ifdef AIX 586 { SA_ONSTACK, "SA_ONSTACK" }, 587 { SA_OLDSTYLE, "SA_OLDSTYLE" }, 588#endif 589 { 0, NULL } 590 }; 591 592 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { 593 if (flags & flaginfo[idx].i) { 594 if (first) { 595 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); 596 first = false; 597 } else { 598 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); 599 } 600 const size_t len = strlen(p); 601 p += len; 602 remaining -= len; 603 } 604 } 605 606 buffer[size - 1] = '\0'; 607 608 return buffer; 609} 610 611// Prints one-line description of a combination of sigaction.sa_flags. 612void os::Posix::print_sa_flags(outputStream* st, int flags) { 613 char buffer[0x100]; 614 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); 615 st->print(buffer); 616} 617 618// Helper function for os::Posix::print_siginfo_...(): 619// return a textual description for signal code. 620struct enum_sigcode_desc_t { 621 const char* s_name; 622 const char* s_desc; 623}; 624 625static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { 626 627 const struct { 628 int sig; int code; const char* s_code; const char* s_desc; 629 } t1 [] = { 630 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, 631 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, 632 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, 633 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, 634 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, 635 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, 636 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, 637 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, 638#if defined(IA64) && defined(LINUX) 639 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, 640 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, 641#endif 642 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, 643 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, 644 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, 645 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, 646 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, 647 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, 648 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, 649 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, 650 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, 651 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, 652#ifdef AIX 653 // no explanation found what keyerr would be 654 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, 655#endif 656#if defined(IA64) && !defined(AIX) 657 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, 658#endif 659 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, 660 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, 661 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, 662 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, 663 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, 664 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, 665 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, 666 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, 667 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, 668 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, 669 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, 670#ifdef SIGPOLL 671 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, 672 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, 673 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, 674 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, 675 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, 676#endif 677 { -1, -1, NULL, NULL } 678 }; 679 680 // Codes valid in any signal context. 681 const struct { 682 int code; const char* s_code; const char* s_desc; 683 } t2 [] = { 684 { SI_USER, "SI_USER", "Signal sent by kill()." }, 685 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, 686 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, 687 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, 688 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, 689 // Linux specific 690#ifdef SI_TKILL 691 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, 692#endif 693#ifdef SI_DETHREAD 694 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, 695#endif 696#ifdef SI_KERNEL 697 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, 698#endif 699#ifdef SI_SIGIO 700 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, 701#endif 702 703#ifdef AIX 704 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, 705 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, 706#endif 707 708#ifdef __sun 709 { SI_NOINFO, "SI_NOINFO", "No signal information" }, 710 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, 711 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, 712#endif 713 714 { -1, NULL, NULL } 715 }; 716 717 const char* s_code = NULL; 718 const char* s_desc = NULL; 719 720 for (int i = 0; t1[i].sig != -1; i ++) { 721 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { 722 s_code = t1[i].s_code; 723 s_desc = t1[i].s_desc; 724 break; 725 } 726 } 727 728 if (s_code == NULL) { 729 for (int i = 0; t2[i].s_code != NULL; i ++) { 730 if (t2[i].code == si->si_code) { 731 s_code = t2[i].s_code; 732 s_desc = t2[i].s_desc; 733 } 734 } 735 } 736 737 if (s_code == NULL) { 738 out->s_name = "unknown"; 739 out->s_desc = "unknown"; 740 return false; 741 } 742 743 out->s_name = s_code; 744 out->s_desc = s_desc; 745 746 return true; 747} 748 749// A POSIX conform, platform-independend siginfo print routine. 750// Short print out on one line. 751void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) { 752 char buf[20]; 753 os->print("siginfo: "); 754 755 if (!si) { 756 os->print("<null>"); 757 return; 758 } 759 760 // See print_siginfo_full() for details. 761 const int sig = si->si_signo; 762 763 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); 764 765 enum_sigcode_desc_t ed; 766 if (get_signal_code_description(si, &ed)) { 767 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); 768 } else { 769 os->print(", si_code: %d (unknown)", si->si_code); 770 } 771 772 if (si->si_errno) { 773 os->print(", si_errno: %d", si->si_errno); 774 } 775 776 const int me = (int) ::getpid(); 777 const int pid = (int) si->si_pid; 778 779 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { 780 if (IS_VALID_PID(pid) && pid != me) { 781 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid); 782 } 783 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || 784 sig == SIGTRAP || sig == SIGFPE) { 785 os->print(", si_addr: " PTR_FORMAT, si->si_addr); 786#ifdef SIGPOLL 787 } else if (sig == SIGPOLL) { 788 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band); 789#endif 790 } else if (sig == SIGCHLD) { 791 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status); 792 } 793} 794 795os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 796 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 797} 798 799/* 800 * See the caveats for this class in os_posix.hpp 801 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this 802 * method and returns false. If none of the signals are raised, returns true. 803 * The callback is supposed to provide the method that should be protected. 804 */ 805bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 806 sigset_t saved_sig_mask; 807 808 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 809 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 810 "crash_protection already set?"); 811 812 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask 813 // since on at least some systems (OS X) siglongjmp will restore the mask 814 // for the process, not the thread 815 pthread_sigmask(0, NULL, &saved_sig_mask); 816 if (sigsetjmp(_jmpbuf, 0) == 0) { 817 // make sure we can see in the signal handler that we have crash protection 818 // installed 819 WatcherThread::watcher_thread()->set_crash_protection(this); 820 cb.call(); 821 // and clear the crash protection 822 WatcherThread::watcher_thread()->set_crash_protection(NULL); 823 return true; 824 } 825 // this happens when we siglongjmp() back 826 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); 827 WatcherThread::watcher_thread()->set_crash_protection(NULL); 828 return false; 829} 830 831void os::WatcherThreadCrashProtection::restore() { 832 assert(WatcherThread::watcher_thread()->has_crash_protection(), 833 "must have crash protection"); 834 835 siglongjmp(_jmpbuf, 1); 836} 837 838void os::WatcherThreadCrashProtection::check_crash_protection(int sig, 839 Thread* thread) { 840 841 if (thread != NULL && 842 thread->is_Watcher_thread() && 843 WatcherThread::watcher_thread()->has_crash_protection()) { 844 845 if (sig == SIGSEGV || sig == SIGBUS) { 846 WatcherThread::watcher_thread()->crash_protection()->restore(); 847 } 848 } 849} 850