os_posix.cpp revision 5966:e2722a66aba7
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 36// Todo: provide a os::get_max_process_id() or similar. Number of processes 37// may have been configured, can be read more accurately from proc fs etc. 38#ifndef MAX_PID 39#define MAX_PID INT_MAX 40#endif 41#define IS_VALID_PID(p) (p > 0 && p < MAX_PID) 42 43// Check core dump limit and report possible place where core can be found 44void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 45 int n; 46 struct rlimit rlim; 47 bool success; 48 49 n = get_core_path(buffer, bufferSize); 50 51 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { 52 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); 53 success = true; 54 } else { 55 switch(rlim.rlim_cur) { 56 case RLIM_INFINITY: 57 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); 58 success = true; 59 break; 60 case 0: 61 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); 62 success = false; 63 break; 64 default: 65 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)); 66 success = true; 67 break; 68 } 69 } 70 VMError::report_coredump_status(buffer, success); 71} 72 73address os::get_caller_pc(int n) { 74#ifdef _NMT_NOINLINE_ 75 n ++; 76#endif 77 frame fr = os::current_frame(); 78 while (n > 0 && fr.pc() && 79 !os::is_first_C_frame(&fr) && fr.sender_pc()) { 80 fr = os::get_sender_for_C_frame(&fr); 81 n --; 82 } 83 if (n == 0) { 84 return fr.pc(); 85 } else { 86 return NULL; 87 } 88} 89 90int os::get_last_error() { 91 return errno; 92} 93 94bool os::is_debugger_attached() { 95 // not implemented 96 return false; 97} 98 99void os::wait_for_keypress_at_exit(void) { 100 // don't do anything on posix platforms 101 return; 102} 103 104// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, 105// so on posix, unmap the section at the start and at the end of the chunk that we mapped 106// rather than unmapping and remapping the whole chunk to get requested alignment. 107char* os::reserve_memory_aligned(size_t size, size_t alignment) { 108 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 109 "Alignment must be a multiple of allocation granularity (page size)"); 110 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 111 112 size_t extra_size = size + alignment; 113 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 114 115 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 116 117 if (extra_base == NULL) { 118 return NULL; 119 } 120 121 // Do manual alignment 122 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 123 124 // [ | | ] 125 // ^ extra_base 126 // ^ extra_base + begin_offset == aligned_base 127 // extra_base + begin_offset + size ^ 128 // extra_base + extra_size ^ 129 // |<>| == begin_offset 130 // end_offset == |<>| 131 size_t begin_offset = aligned_base - extra_base; 132 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); 133 134 if (begin_offset > 0) { 135 os::release_memory(extra_base, begin_offset); 136 } 137 138 if (end_offset > 0) { 139 os::release_memory(extra_base + begin_offset + size, end_offset); 140 } 141 142 return aligned_base; 143} 144 145void os::Posix::print_load_average(outputStream* st) { 146 st->print("load average:"); 147 double loadavg[3]; 148 os::loadavg(loadavg, 3); 149 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 150 st->cr(); 151} 152 153void os::Posix::print_rlimit_info(outputStream* st) { 154 st->print("rlimit:"); 155 struct rlimit rlim; 156 157 st->print(" STACK "); 158 getrlimit(RLIMIT_STACK, &rlim); 159 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 160 else st->print("%uk", rlim.rlim_cur >> 10); 161 162 st->print(", CORE "); 163 getrlimit(RLIMIT_CORE, &rlim); 164 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 165 else st->print("%uk", rlim.rlim_cur >> 10); 166 167 // Isn't there on solaris 168#if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) 169 st->print(", NPROC "); 170 getrlimit(RLIMIT_NPROC, &rlim); 171 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 172 else st->print("%d", rlim.rlim_cur); 173#endif 174 175 st->print(", NOFILE "); 176 getrlimit(RLIMIT_NOFILE, &rlim); 177 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 178 else st->print("%d", rlim.rlim_cur); 179 180 st->print(", AS "); 181 getrlimit(RLIMIT_AS, &rlim); 182 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 183 else st->print("%uk", rlim.rlim_cur >> 10); 184 st->cr(); 185} 186 187void os::Posix::print_uname_info(outputStream* st) { 188 // kernel 189 st->print("uname:"); 190 struct utsname name; 191 uname(&name); 192 st->print(name.sysname); st->print(" "); 193 st->print(name.release); st->print(" "); 194 st->print(name.version); st->print(" "); 195 st->print(name.machine); 196 st->cr(); 197} 198 199bool os::has_allocatable_memory_limit(julong* limit) { 200 struct rlimit rlim; 201 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); 202 // if there was an error when calling getrlimit, assume that there is no limitation 203 // on virtual memory. 204 bool result; 205 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { 206 result = false; 207 } else { 208 *limit = (julong)rlim.rlim_cur; 209 result = true; 210 } 211#ifdef _LP64 212 return result; 213#else 214 // arbitrary virtual space limit for 32 bit Unices found by testing. If 215 // getrlimit above returned a limit, bound it with this limit. Otherwise 216 // directly use it. 217 const julong max_virtual_limit = (julong)3800*M; 218 if (result) { 219 *limit = MIN2(*limit, max_virtual_limit); 220 } else { 221 *limit = max_virtual_limit; 222 } 223 224 // bound by actually allocatable memory. The algorithm uses two bounds, an 225 // upper and a lower limit. The upper limit is the current highest amount of 226 // memory that could not be allocated, the lower limit is the current highest 227 // amount of memory that could be allocated. 228 // The algorithm iteratively refines the result by halving the difference 229 // between these limits, updating either the upper limit (if that value could 230 // not be allocated) or the lower limit (if the that value could be allocated) 231 // until the difference between these limits is "small". 232 233 // the minimum amount of memory we care about allocating. 234 const julong min_allocation_size = M; 235 236 julong upper_limit = *limit; 237 238 // first check a few trivial cases 239 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { 240 *limit = upper_limit; 241 } else if (!is_allocatable(min_allocation_size)) { 242 // we found that not even min_allocation_size is allocatable. Return it 243 // anyway. There is no point to search for a better value any more. 244 *limit = min_allocation_size; 245 } else { 246 // perform the binary search. 247 julong lower_limit = min_allocation_size; 248 while ((upper_limit - lower_limit) > min_allocation_size) { 249 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; 250 temp_limit = align_size_down_(temp_limit, min_allocation_size); 251 if (is_allocatable(temp_limit)) { 252 lower_limit = temp_limit; 253 } else { 254 upper_limit = temp_limit; 255 } 256 } 257 *limit = lower_limit; 258 } 259 return true; 260#endif 261} 262 263const char* os::get_current_directory(char *buf, size_t buflen) { 264 return getcwd(buf, buflen); 265} 266 267FILE* os::open(int fd, const char* mode) { 268 return ::fdopen(fd, mode); 269} 270 271void* os::get_default_process_handle() { 272 return (void*)::dlopen(NULL, RTLD_LAZY); 273} 274 275// Builds a platform dependent Agent_OnLoad_<lib_name> function name 276// which is used to find statically linked in agents. 277// Parameters: 278// sym_name: Symbol in library we are looking for 279// lib_name: Name of library to look in, NULL for shared libs. 280// is_absolute_path == true if lib_name is absolute path to agent 281// such as "/a/b/libL.so" 282// == false if only the base name of the library is passed in 283// such as "L" 284char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 285 bool is_absolute_path) { 286 char *agent_entry_name; 287 size_t len; 288 size_t name_len; 289 size_t prefix_len = strlen(JNI_LIB_PREFIX); 290 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 291 const char *start; 292 293 if (lib_name != NULL) { 294 len = name_len = strlen(lib_name); 295 if (is_absolute_path) { 296 // Need to strip path, prefix and suffix 297 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 298 lib_name = ++start; 299 } 300 if (len <= (prefix_len + suffix_len)) { 301 return NULL; 302 } 303 lib_name += prefix_len; 304 name_len = strlen(lib_name) - suffix_len; 305 } 306 } 307 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 308 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 309 if (agent_entry_name == NULL) { 310 return NULL; 311 } 312 strcpy(agent_entry_name, sym_name); 313 if (lib_name != NULL) { 314 strcat(agent_entry_name, "_"); 315 strncat(agent_entry_name, lib_name, name_len); 316 } 317 return agent_entry_name; 318} 319 320// Returned string is a constant. For unknown signals "UNKNOWN" is returned. 321const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { 322 323 static const struct { 324 int sig; const char* name; 325 } 326 info[] = 327 { 328 { SIGABRT, "SIGABRT" }, 329#ifdef SIGAIO 330 { SIGAIO, "SIGAIO" }, 331#endif 332 { SIGALRM, "SIGALRM" }, 333#ifdef SIGALRM1 334 { SIGALRM1, "SIGALRM1" }, 335#endif 336 { SIGBUS, "SIGBUS" }, 337#ifdef SIGCANCEL 338 { SIGCANCEL, "SIGCANCEL" }, 339#endif 340 { SIGCHLD, "SIGCHLD" }, 341#ifdef SIGCLD 342 { SIGCLD, "SIGCLD" }, 343#endif 344 { SIGCONT, "SIGCONT" }, 345#ifdef SIGCPUFAIL 346 { SIGCPUFAIL, "SIGCPUFAIL" }, 347#endif 348#ifdef SIGDANGER 349 { SIGDANGER, "SIGDANGER" }, 350#endif 351#ifdef SIGDIL 352 { SIGDIL, "SIGDIL" }, 353#endif 354#ifdef SIGEMT 355 { SIGEMT, "SIGEMT" }, 356#endif 357 { SIGFPE, "SIGFPE" }, 358#ifdef SIGFREEZE 359 { SIGFREEZE, "SIGFREEZE" }, 360#endif 361#ifdef SIGGFAULT 362 { SIGGFAULT, "SIGGFAULT" }, 363#endif 364#ifdef SIGGRANT 365 { SIGGRANT, "SIGGRANT" }, 366#endif 367 { SIGHUP, "SIGHUP" }, 368 { SIGILL, "SIGILL" }, 369 { SIGINT, "SIGINT" }, 370#ifdef SIGIO 371 { SIGIO, "SIGIO" }, 372#endif 373#ifdef SIGIOINT 374 { SIGIOINT, "SIGIOINT" }, 375#endif 376#ifdef SIGIOT 377 // SIGIOT is there for BSD compatibility, but on most Unices just a 378 // synonym for SIGABRT. The result should be "SIGABRT", not 379 // "SIGIOT". 380 #if (SIGIOT != SIGABRT ) 381 { SIGIOT, "SIGIOT" }, 382 #endif 383#endif 384#ifdef SIGKAP 385 { SIGKAP, "SIGKAP" }, 386#endif 387 { SIGKILL, "SIGKILL" }, 388#ifdef SIGLOST 389 { SIGLOST, "SIGLOST" }, 390#endif 391#ifdef SIGLWP 392 { SIGLWP, "SIGLWP" }, 393#endif 394#ifdef SIGLWPTIMER 395 { SIGLWPTIMER, "SIGLWPTIMER" }, 396#endif 397#ifdef SIGMIGRATE 398 { SIGMIGRATE, "SIGMIGRATE" }, 399#endif 400#ifdef SIGMSG 401 { SIGMSG, "SIGMSG" }, 402#endif 403 { SIGPIPE, "SIGPIPE" }, 404#ifdef SIGPOLL 405 { SIGPOLL, "SIGPOLL" }, 406#endif 407#ifdef SIGPRE 408 { SIGPRE, "SIGPRE" }, 409#endif 410 { SIGPROF, "SIGPROF" }, 411#ifdef SIGPTY 412 { SIGPTY, "SIGPTY" }, 413#endif 414#ifdef SIGPWR 415 { SIGPWR, "SIGPWR" }, 416#endif 417 { SIGQUIT, "SIGQUIT" }, 418#ifdef SIGRECONFIG 419 { SIGRECONFIG, "SIGRECONFIG" }, 420#endif 421#ifdef SIGRECOVERY 422 { SIGRECOVERY, "SIGRECOVERY" }, 423#endif 424#ifdef SIGRESERVE 425 { SIGRESERVE, "SIGRESERVE" }, 426#endif 427#ifdef SIGRETRACT 428 { SIGRETRACT, "SIGRETRACT" }, 429#endif 430#ifdef SIGSAK 431 { SIGSAK, "SIGSAK" }, 432#endif 433 { SIGSEGV, "SIGSEGV" }, 434#ifdef SIGSOUND 435 { SIGSOUND, "SIGSOUND" }, 436#endif 437 { SIGSTOP, "SIGSTOP" }, 438 { SIGSYS, "SIGSYS" }, 439#ifdef SIGSYSERROR 440 { SIGSYSERROR, "SIGSYSERROR" }, 441#endif 442#ifdef SIGTALRM 443 { SIGTALRM, "SIGTALRM" }, 444#endif 445 { SIGTERM, "SIGTERM" }, 446#ifdef SIGTHAW 447 { SIGTHAW, "SIGTHAW" }, 448#endif 449 { SIGTRAP, "SIGTRAP" }, 450#ifdef SIGTSTP 451 { SIGTSTP, "SIGTSTP" }, 452#endif 453 { SIGTTIN, "SIGTTIN" }, 454 { SIGTTOU, "SIGTTOU" }, 455#ifdef SIGURG 456 { SIGURG, "SIGURG" }, 457#endif 458 { SIGUSR1, "SIGUSR1" }, 459 { SIGUSR2, "SIGUSR2" }, 460#ifdef SIGVIRT 461 { SIGVIRT, "SIGVIRT" }, 462#endif 463 { SIGVTALRM, "SIGVTALRM" }, 464#ifdef SIGWAITING 465 { SIGWAITING, "SIGWAITING" }, 466#endif 467#ifdef SIGWINCH 468 { SIGWINCH, "SIGWINCH" }, 469#endif 470#ifdef SIGWINDOW 471 { SIGWINDOW, "SIGWINDOW" }, 472#endif 473 { SIGXCPU, "SIGXCPU" }, 474 { SIGXFSZ, "SIGXFSZ" }, 475#ifdef SIGXRES 476 { SIGXRES, "SIGXRES" }, 477#endif 478 { -1, NULL } 479 }; 480 481 const char* ret = NULL; 482 483#ifdef SIGRTMIN 484 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { 485 if (sig == SIGRTMIN) { 486 ret = "SIGRTMIN"; 487 } else if (sig == SIGRTMAX) { 488 ret = "SIGRTMAX"; 489 } else { 490 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); 491 return out; 492 } 493 } 494#endif 495 496 if (sig > 0) { 497 for (int idx = 0; info[idx].sig != -1; idx ++) { 498 if (info[idx].sig == sig) { 499 ret = info[idx].name; 500 break; 501 } 502 } 503 } 504 505 if (!ret) { 506 if (!is_valid_signal(sig)) { 507 ret = "INVALID"; 508 } else { 509 ret = "UNKNOWN"; 510 } 511 } 512 513 jio_snprintf(out, outlen, ret); 514 return out; 515} 516 517// Returns true if signal number is valid. 518bool os::Posix::is_valid_signal(int sig) { 519 // MacOS not really POSIX compliant: sigaddset does not return 520 // an error for invalid signal numbers. However, MacOS does not 521 // support real time signals and simply seems to have just 33 522 // signals with no holes in the signal range. 523#ifdef __APPLE__ 524 return sig >= 1 && sig < NSIG; 525#else 526 // Use sigaddset to check for signal validity. 527 sigset_t set; 528 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { 529 return false; 530 } 531 return true; 532#endif 533} 534 535#define NUM_IMPORTANT_SIGS 32 536// Returns one-line short description of a signal set in a user provided buffer. 537const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { 538 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); 539 // Note: for shortness, just print out the first 32. That should 540 // cover most of the useful ones, apart from realtime signals. 541 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { 542 const int rc = sigismember(set, sig); 543 if (rc == -1 && errno == EINVAL) { 544 buffer[sig-1] = '?'; 545 } else { 546 buffer[sig-1] = rc == 0 ? '0' : '1'; 547 } 548 } 549 buffer[NUM_IMPORTANT_SIGS] = 0; 550 return buffer; 551} 552 553// Prints one-line description of a signal set. 554void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { 555 char buf[NUM_IMPORTANT_SIGS + 1]; 556 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); 557 st->print(buf); 558} 559 560// Writes one-line description of a combination of sigaction.sa_flags into a user 561// provided buffer. Returns that buffer. 562const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { 563 char* p = buffer; 564 size_t remaining = size; 565 bool first = true; 566 int idx = 0; 567 568 assert(buffer, "invalid argument"); 569 570 if (size == 0) { 571 return buffer; 572 } 573 574 strncpy(buffer, "none", size); 575 576 const struct { 577 int i; 578 const char* s; 579 } flaginfo [] = { 580 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, 581 { SA_ONSTACK, "SA_ONSTACK" }, 582 { SA_RESETHAND, "SA_RESETHAND" }, 583 { SA_RESTART, "SA_RESTART" }, 584 { SA_SIGINFO, "SA_SIGINFO" }, 585 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, 586 { SA_NODEFER, "SA_NODEFER" }, 587#ifdef AIX 588 { SA_ONSTACK, "SA_ONSTACK" }, 589 { SA_OLDSTYLE, "SA_OLDSTYLE" }, 590#endif 591 { 0, NULL } 592 }; 593 594 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { 595 if (flags & flaginfo[idx].i) { 596 if (first) { 597 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); 598 first = false; 599 } else { 600 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); 601 } 602 const size_t len = strlen(p); 603 p += len; 604 remaining -= len; 605 } 606 } 607 608 buffer[size - 1] = '\0'; 609 610 return buffer; 611} 612 613// Prints one-line description of a combination of sigaction.sa_flags. 614void os::Posix::print_sa_flags(outputStream* st, int flags) { 615 char buffer[0x100]; 616 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); 617 st->print(buffer); 618} 619 620// Helper function for os::Posix::print_siginfo_...(): 621// return a textual description for signal code. 622struct enum_sigcode_desc_t { 623 const char* s_name; 624 const char* s_desc; 625}; 626 627static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { 628 629 const struct { 630 int sig; int code; const char* s_code; const char* s_desc; 631 } t1 [] = { 632 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, 633 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, 634 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, 635 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, 636 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, 637 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, 638 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, 639 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, 640#if defined(IA64) && defined(LINUX) 641 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, 642 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, 643#endif 644 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, 645 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, 646 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, 647 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, 648 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, 649 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, 650 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, 651 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, 652 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, 653 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, 654#ifdef AIX 655 // no explanation found what keyerr would be 656 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, 657#endif 658#if defined(IA64) && !defined(AIX) 659 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, 660#endif 661 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, 662 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, 663 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, 664 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, 665 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, 666 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, 667 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, 668 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, 669 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, 670 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, 671 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, 672#ifdef SIGPOLL 673 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, 674 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, 675 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, 676 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, 677 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, 678#endif 679 { -1, -1, NULL, NULL } 680 }; 681 682 // Codes valid in any signal context. 683 const struct { 684 int code; const char* s_code; const char* s_desc; 685 } t2 [] = { 686 { SI_USER, "SI_USER", "Signal sent by kill()." }, 687 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, 688 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, 689 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, 690 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, 691 // Linux specific 692#ifdef SI_TKILL 693 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, 694#endif 695#ifdef SI_DETHREAD 696 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, 697#endif 698#ifdef SI_KERNEL 699 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, 700#endif 701#ifdef SI_SIGIO 702 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, 703#endif 704 705#ifdef AIX 706 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, 707 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, 708#endif 709 710#ifdef __sun 711 { SI_NOINFO, "SI_NOINFO", "No signal information" }, 712 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, 713 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, 714#endif 715 716 { -1, NULL, NULL } 717 }; 718 719 const char* s_code = NULL; 720 const char* s_desc = NULL; 721 722 for (int i = 0; t1[i].sig != -1; i ++) { 723 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { 724 s_code = t1[i].s_code; 725 s_desc = t1[i].s_desc; 726 break; 727 } 728 } 729 730 if (s_code == NULL) { 731 for (int i = 0; t2[i].s_code != NULL; i ++) { 732 if (t2[i].code == si->si_code) { 733 s_code = t2[i].s_code; 734 s_desc = t2[i].s_desc; 735 } 736 } 737 } 738 739 if (s_code == NULL) { 740 out->s_name = "unknown"; 741 out->s_desc = "unknown"; 742 return false; 743 } 744 745 out->s_name = s_code; 746 out->s_desc = s_desc; 747 748 return true; 749} 750 751// A POSIX conform, platform-independend siginfo print routine. 752// Short print out on one line. 753void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) { 754 char buf[20]; 755 os->print("siginfo: "); 756 757 if (!si) { 758 os->print("<null>"); 759 return; 760 } 761 762 // See print_siginfo_full() for details. 763 const int sig = si->si_signo; 764 765 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); 766 767 enum_sigcode_desc_t ed; 768 if (get_signal_code_description(si, &ed)) { 769 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); 770 } else { 771 os->print(", si_code: %d (unknown)", si->si_code); 772 } 773 774 if (si->si_errno) { 775 os->print(", si_errno: %d", si->si_errno); 776 } 777 778 const int me = (int) ::getpid(); 779 const int pid = (int) si->si_pid; 780 781 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { 782 if (IS_VALID_PID(pid) && pid != me) { 783 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid); 784 } 785 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || 786 sig == SIGTRAP || sig == SIGFPE) { 787 os->print(", si_addr: " PTR_FORMAT, si->si_addr); 788#ifdef SIGPOLL 789 } else if (sig == SIGPOLL) { 790 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band); 791#endif 792 } else if (sig == SIGCHLD) { 793 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status); 794 } 795} 796 797os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 798 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 799} 800 801/* 802 * See the caveats for this class in os_posix.hpp 803 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this 804 * method and returns false. If none of the signals are raised, returns true. 805 * The callback is supposed to provide the method that should be protected. 806 */ 807bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 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 if (sigsetjmp(_jmpbuf, 1) == 0) { 813 // make sure we can see in the signal handler that we have crash protection 814 // installed 815 WatcherThread::watcher_thread()->set_crash_protection(this); 816 cb.call(); 817 // and clear the crash protection 818 WatcherThread::watcher_thread()->set_crash_protection(NULL); 819 return true; 820 } 821 // this happens when we siglongjmp() back 822 WatcherThread::watcher_thread()->set_crash_protection(NULL); 823 return false; 824} 825 826void os::WatcherThreadCrashProtection::restore() { 827 assert(WatcherThread::watcher_thread()->has_crash_protection(), 828 "must have crash protection"); 829 830 siglongjmp(_jmpbuf, 1); 831} 832 833void os::WatcherThreadCrashProtection::check_crash_protection(int sig, 834 Thread* thread) { 835 836 if (thread != NULL && 837 thread->is_Watcher_thread() && 838 WatcherThread::watcher_thread()->has_crash_protection()) { 839 840 if (sig == SIGSEGV || sig == SIGBUS) { 841 WatcherThread::watcher_thread()->crash_protection()->restore(); 842 } 843 } 844} 845