os_posix.cpp revision 9842:4055f3ec41cd
1/* 2 * Copyright (c) 1999, 2015, 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 "semaphore_posix.hpp" 28#include "runtime/frame.inline.hpp" 29#include "runtime/interfaceSupport.hpp" 30#include "runtime/os.hpp" 31#include "utilities/vmError.hpp" 32 33#include <signal.h> 34#include <unistd.h> 35#include <sys/resource.h> 36#include <sys/utsname.h> 37#include <pthread.h> 38#include <semaphore.h> 39#include <signal.h> 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// Check core dump limit and report possible place where core can be found 49void os::check_dump_limit(char* buffer, size_t bufferSize) { 50 int n; 51 struct rlimit rlim; 52 bool success; 53 54 char core_path[PATH_MAX]; 55 n = get_core_path(core_path, PATH_MAX); 56 57 if (n <= 0) { 58 jio_snprintf(buffer, bufferSize, "core.%d (may not exist)", current_process_id()); 59 success = true; 60#ifdef LINUX 61 } else if (core_path[0] == '"') { // redirect to user process 62 jio_snprintf(buffer, bufferSize, "Core dumps may be processed with %s", core_path); 63 success = true; 64#endif 65 } else if (getrlimit(RLIMIT_CORE, &rlim) != 0) { 66 jio_snprintf(buffer, bufferSize, "%s (may not exist)", core_path); 67 success = true; 68 } else { 69 switch(rlim.rlim_cur) { 70 case RLIM_INFINITY: 71 jio_snprintf(buffer, bufferSize, "%s", core_path); 72 success = true; 73 break; 74 case 0: 75 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); 76 success = false; 77 break; 78 default: 79 jio_snprintf(buffer, bufferSize, "%s (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", core_path, (unsigned long)(rlim.rlim_cur >> 10)); 80 success = true; 81 break; 82 } 83 } 84 85 VMError::record_coredump_status(buffer, success); 86} 87 88int os::get_native_stack(address* stack, int frames, int toSkip) { 89#ifdef _NMT_NOINLINE_ 90 toSkip++; 91#endif 92 93 int frame_idx = 0; 94 int num_of_frames; // number of frames captured 95 frame fr = os::current_frame(); 96 while (fr.pc() && frame_idx < frames) { 97 if (toSkip > 0) { 98 toSkip --; 99 } else { 100 stack[frame_idx ++] = fr.pc(); 101 } 102 if (fr.fp() == NULL || fr.cb() != NULL || 103 fr.sender_pc() == NULL || os::is_first_C_frame(&fr)) break; 104 105 if (fr.sender_pc() && !os::is_first_C_frame(&fr)) { 106 fr = os::get_sender_for_C_frame(&fr); 107 } else { 108 break; 109 } 110 } 111 num_of_frames = frame_idx; 112 for (; frame_idx < frames; frame_idx ++) { 113 stack[frame_idx] = NULL; 114 } 115 116 return num_of_frames; 117} 118 119 120bool os::unsetenv(const char* name) { 121 assert(name != NULL, "Null pointer"); 122 return (::unsetenv(name) == 0); 123} 124 125int os::get_last_error() { 126 return errno; 127} 128 129bool os::is_debugger_attached() { 130 // not implemented 131 return false; 132} 133 134void os::wait_for_keypress_at_exit(void) { 135 // don't do anything on posix platforms 136 return; 137} 138 139// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, 140// so on posix, unmap the section at the start and at the end of the chunk that we mapped 141// rather than unmapping and remapping the whole chunk to get requested alignment. 142char* os::reserve_memory_aligned(size_t size, size_t alignment) { 143 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 144 "Alignment must be a multiple of allocation granularity (page size)"); 145 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 146 147 size_t extra_size = size + alignment; 148 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 149 150 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 151 152 if (extra_base == NULL) { 153 return NULL; 154 } 155 156 // Do manual alignment 157 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 158 159 // [ | | ] 160 // ^ extra_base 161 // ^ extra_base + begin_offset == aligned_base 162 // extra_base + begin_offset + size ^ 163 // extra_base + extra_size ^ 164 // |<>| == begin_offset 165 // end_offset == |<>| 166 size_t begin_offset = aligned_base - extra_base; 167 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); 168 169 if (begin_offset > 0) { 170 os::release_memory(extra_base, begin_offset); 171 } 172 173 if (end_offset > 0) { 174 os::release_memory(extra_base + begin_offset + size, end_offset); 175 } 176 177 return aligned_base; 178} 179 180int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 181 return vsnprintf(buf, len, fmt, args); 182} 183 184void os::Posix::print_load_average(outputStream* st) { 185 st->print("load average:"); 186 double loadavg[3]; 187 os::loadavg(loadavg, 3); 188 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 189 st->cr(); 190} 191 192void os::Posix::print_rlimit_info(outputStream* st) { 193 st->print("rlimit:"); 194 struct rlimit rlim; 195 196 st->print(" STACK "); 197 getrlimit(RLIMIT_STACK, &rlim); 198 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 199 else st->print("%luk", rlim.rlim_cur >> 10); 200 201 st->print(", CORE "); 202 getrlimit(RLIMIT_CORE, &rlim); 203 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 204 else st->print("%luk", rlim.rlim_cur >> 10); 205 206 // Isn't there on solaris 207#if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) 208 st->print(", NPROC "); 209 getrlimit(RLIMIT_NPROC, &rlim); 210 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 211 else st->print("%lu", rlim.rlim_cur); 212#endif 213 214 st->print(", NOFILE "); 215 getrlimit(RLIMIT_NOFILE, &rlim); 216 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 217 else st->print("%lu", rlim.rlim_cur); 218 219 st->print(", AS "); 220 getrlimit(RLIMIT_AS, &rlim); 221 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 222 else st->print("%luk", rlim.rlim_cur >> 10); 223 st->cr(); 224} 225 226void os::Posix::print_uname_info(outputStream* st) { 227 // kernel 228 st->print("uname:"); 229 struct utsname name; 230 uname(&name); 231 st->print("%s ", name.sysname); 232#ifdef ASSERT 233 st->print("%s ", name.nodename); 234#endif 235 st->print("%s ", name.release); 236 st->print("%s ", name.version); 237 st->print("%s", name.machine); 238 st->cr(); 239} 240 241#ifndef PRODUCT 242bool os::get_host_name(char* buf, size_t buflen) { 243 struct utsname name; 244 uname(&name); 245 jio_snprintf(buf, buflen, "%s", name.nodename); 246 return true; 247} 248#endif // PRODUCT 249 250bool os::has_allocatable_memory_limit(julong* limit) { 251 struct rlimit rlim; 252 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); 253 // if there was an error when calling getrlimit, assume that there is no limitation 254 // on virtual memory. 255 bool result; 256 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { 257 result = false; 258 } else { 259 *limit = (julong)rlim.rlim_cur; 260 result = true; 261 } 262#ifdef _LP64 263 return result; 264#else 265 // arbitrary virtual space limit for 32 bit Unices found by testing. If 266 // getrlimit above returned a limit, bound it with this limit. Otherwise 267 // directly use it. 268 const julong max_virtual_limit = (julong)3800*M; 269 if (result) { 270 *limit = MIN2(*limit, max_virtual_limit); 271 } else { 272 *limit = max_virtual_limit; 273 } 274 275 // bound by actually allocatable memory. The algorithm uses two bounds, an 276 // upper and a lower limit. The upper limit is the current highest amount of 277 // memory that could not be allocated, the lower limit is the current highest 278 // amount of memory that could be allocated. 279 // The algorithm iteratively refines the result by halving the difference 280 // between these limits, updating either the upper limit (if that value could 281 // not be allocated) or the lower limit (if the that value could be allocated) 282 // until the difference between these limits is "small". 283 284 // the minimum amount of memory we care about allocating. 285 const julong min_allocation_size = M; 286 287 julong upper_limit = *limit; 288 289 // first check a few trivial cases 290 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { 291 *limit = upper_limit; 292 } else if (!is_allocatable(min_allocation_size)) { 293 // we found that not even min_allocation_size is allocatable. Return it 294 // anyway. There is no point to search for a better value any more. 295 *limit = min_allocation_size; 296 } else { 297 // perform the binary search. 298 julong lower_limit = min_allocation_size; 299 while ((upper_limit - lower_limit) > min_allocation_size) { 300 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; 301 temp_limit = align_size_down_(temp_limit, min_allocation_size); 302 if (is_allocatable(temp_limit)) { 303 lower_limit = temp_limit; 304 } else { 305 upper_limit = temp_limit; 306 } 307 } 308 *limit = lower_limit; 309 } 310 return true; 311#endif 312} 313 314const char* os::get_current_directory(char *buf, size_t buflen) { 315 return getcwd(buf, buflen); 316} 317 318FILE* os::open(int fd, const char* mode) { 319 return ::fdopen(fd, mode); 320} 321 322// Builds a platform dependent Agent_OnLoad_<lib_name> function name 323// which is used to find statically linked in agents. 324// Parameters: 325// sym_name: Symbol in library we are looking for 326// lib_name: Name of library to look in, NULL for shared libs. 327// is_absolute_path == true if lib_name is absolute path to agent 328// such as "/a/b/libL.so" 329// == false if only the base name of the library is passed in 330// such as "L" 331char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 332 bool is_absolute_path) { 333 char *agent_entry_name; 334 size_t len; 335 size_t name_len; 336 size_t prefix_len = strlen(JNI_LIB_PREFIX); 337 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 338 const char *start; 339 340 if (lib_name != NULL) { 341 len = name_len = strlen(lib_name); 342 if (is_absolute_path) { 343 // Need to strip path, prefix and suffix 344 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 345 lib_name = ++start; 346 } 347 if (len <= (prefix_len + suffix_len)) { 348 return NULL; 349 } 350 lib_name += prefix_len; 351 name_len = strlen(lib_name) - suffix_len; 352 } 353 } 354 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 355 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 356 if (agent_entry_name == NULL) { 357 return NULL; 358 } 359 strcpy(agent_entry_name, sym_name); 360 if (lib_name != NULL) { 361 strcat(agent_entry_name, "_"); 362 strncat(agent_entry_name, lib_name, name_len); 363 } 364 return agent_entry_name; 365} 366 367int os::sleep(Thread* thread, jlong millis, bool interruptible) { 368 assert(thread == Thread::current(), "thread consistency check"); 369 370 ParkEvent * const slp = thread->_SleepEvent ; 371 slp->reset() ; 372 OrderAccess::fence() ; 373 374 if (interruptible) { 375 jlong prevtime = javaTimeNanos(); 376 377 for (;;) { 378 if (os::is_interrupted(thread, true)) { 379 return OS_INTRPT; 380 } 381 382 jlong newtime = javaTimeNanos(); 383 384 if (newtime - prevtime < 0) { 385 // time moving backwards, should only happen if no monotonic clock 386 // not a guarantee() because JVM should not abort on kernel/glibc bugs 387 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected in os::sleep(interruptible)"); 388 } else { 389 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 390 } 391 392 if (millis <= 0) { 393 return OS_OK; 394 } 395 396 prevtime = newtime; 397 398 { 399 assert(thread->is_Java_thread(), "sanity check"); 400 JavaThread *jt = (JavaThread *) thread; 401 ThreadBlockInVM tbivm(jt); 402 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 403 404 jt->set_suspend_equivalent(); 405 // cleared by handle_special_suspend_equivalent_condition() or 406 // java_suspend_self() via check_and_wait_while_suspended() 407 408 slp->park(millis); 409 410 // were we externally suspended while we were waiting? 411 jt->check_and_wait_while_suspended(); 412 } 413 } 414 } else { 415 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 416 jlong prevtime = javaTimeNanos(); 417 418 for (;;) { 419 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 420 // the 1st iteration ... 421 jlong newtime = javaTimeNanos(); 422 423 if (newtime - prevtime < 0) { 424 // time moving backwards, should only happen if no monotonic clock 425 // not a guarantee() because JVM should not abort on kernel/glibc bugs 426 assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected on os::sleep(!interruptible)"); 427 } else { 428 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 429 } 430 431 if (millis <= 0) break ; 432 433 prevtime = newtime; 434 slp->park(millis); 435 } 436 return OS_OK ; 437 } 438} 439 440//////////////////////////////////////////////////////////////////////////////// 441// interrupt support 442 443void os::interrupt(Thread* thread) { 444 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 445 "possibility of dangling Thread pointer"); 446 447 OSThread* osthread = thread->osthread(); 448 449 if (!osthread->interrupted()) { 450 osthread->set_interrupted(true); 451 // More than one thread can get here with the same value of osthread, 452 // resulting in multiple notifications. We do, however, want the store 453 // to interrupted() to be visible to other threads before we execute unpark(). 454 OrderAccess::fence(); 455 ParkEvent * const slp = thread->_SleepEvent ; 456 if (slp != NULL) slp->unpark() ; 457 } 458 459 // For JSR166. Unpark even if interrupt status already was set 460 if (thread->is_Java_thread()) 461 ((JavaThread*)thread)->parker()->unpark(); 462 463 ParkEvent * ev = thread->_ParkEvent ; 464 if (ev != NULL) ev->unpark() ; 465 466} 467 468bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 469 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 470 "possibility of dangling Thread pointer"); 471 472 OSThread* osthread = thread->osthread(); 473 474 bool interrupted = osthread->interrupted(); 475 476 // NOTE that since there is no "lock" around the interrupt and 477 // is_interrupted operations, there is the possibility that the 478 // interrupted flag (in osThread) will be "false" but that the 479 // low-level events will be in the signaled state. This is 480 // intentional. The effect of this is that Object.wait() and 481 // LockSupport.park() will appear to have a spurious wakeup, which 482 // is allowed and not harmful, and the possibility is so rare that 483 // it is not worth the added complexity to add yet another lock. 484 // For the sleep event an explicit reset is performed on entry 485 // to os::sleep, so there is no early return. It has also been 486 // recommended not to put the interrupted flag into the "event" 487 // structure because it hides the issue. 488 if (interrupted && clear_interrupted) { 489 osthread->set_interrupted(false); 490 // consider thread->_SleepEvent->reset() ... optional optimization 491 } 492 493 return interrupted; 494} 495 496 497 498static const struct { 499 int sig; const char* name; 500} 501 g_signal_info[] = 502 { 503 { SIGABRT, "SIGABRT" }, 504#ifdef SIGAIO 505 { SIGAIO, "SIGAIO" }, 506#endif 507 { SIGALRM, "SIGALRM" }, 508#ifdef SIGALRM1 509 { SIGALRM1, "SIGALRM1" }, 510#endif 511 { SIGBUS, "SIGBUS" }, 512#ifdef SIGCANCEL 513 { SIGCANCEL, "SIGCANCEL" }, 514#endif 515 { SIGCHLD, "SIGCHLD" }, 516#ifdef SIGCLD 517 { SIGCLD, "SIGCLD" }, 518#endif 519 { SIGCONT, "SIGCONT" }, 520#ifdef SIGCPUFAIL 521 { SIGCPUFAIL, "SIGCPUFAIL" }, 522#endif 523#ifdef SIGDANGER 524 { SIGDANGER, "SIGDANGER" }, 525#endif 526#ifdef SIGDIL 527 { SIGDIL, "SIGDIL" }, 528#endif 529#ifdef SIGEMT 530 { SIGEMT, "SIGEMT" }, 531#endif 532 { SIGFPE, "SIGFPE" }, 533#ifdef SIGFREEZE 534 { SIGFREEZE, "SIGFREEZE" }, 535#endif 536#ifdef SIGGFAULT 537 { SIGGFAULT, "SIGGFAULT" }, 538#endif 539#ifdef SIGGRANT 540 { SIGGRANT, "SIGGRANT" }, 541#endif 542 { SIGHUP, "SIGHUP" }, 543 { SIGILL, "SIGILL" }, 544 { SIGINT, "SIGINT" }, 545#ifdef SIGIO 546 { SIGIO, "SIGIO" }, 547#endif 548#ifdef SIGIOINT 549 { SIGIOINT, "SIGIOINT" }, 550#endif 551#ifdef SIGIOT 552// SIGIOT is there for BSD compatibility, but on most Unices just a 553// synonym for SIGABRT. The result should be "SIGABRT", not 554// "SIGIOT". 555#if (SIGIOT != SIGABRT ) 556 { SIGIOT, "SIGIOT" }, 557#endif 558#endif 559#ifdef SIGKAP 560 { SIGKAP, "SIGKAP" }, 561#endif 562 { SIGKILL, "SIGKILL" }, 563#ifdef SIGLOST 564 { SIGLOST, "SIGLOST" }, 565#endif 566#ifdef SIGLWP 567 { SIGLWP, "SIGLWP" }, 568#endif 569#ifdef SIGLWPTIMER 570 { SIGLWPTIMER, "SIGLWPTIMER" }, 571#endif 572#ifdef SIGMIGRATE 573 { SIGMIGRATE, "SIGMIGRATE" }, 574#endif 575#ifdef SIGMSG 576 { SIGMSG, "SIGMSG" }, 577#endif 578 { SIGPIPE, "SIGPIPE" }, 579#ifdef SIGPOLL 580 { SIGPOLL, "SIGPOLL" }, 581#endif 582#ifdef SIGPRE 583 { SIGPRE, "SIGPRE" }, 584#endif 585 { SIGPROF, "SIGPROF" }, 586#ifdef SIGPTY 587 { SIGPTY, "SIGPTY" }, 588#endif 589#ifdef SIGPWR 590 { SIGPWR, "SIGPWR" }, 591#endif 592 { SIGQUIT, "SIGQUIT" }, 593#ifdef SIGRECONFIG 594 { SIGRECONFIG, "SIGRECONFIG" }, 595#endif 596#ifdef SIGRECOVERY 597 { SIGRECOVERY, "SIGRECOVERY" }, 598#endif 599#ifdef SIGRESERVE 600 { SIGRESERVE, "SIGRESERVE" }, 601#endif 602#ifdef SIGRETRACT 603 { SIGRETRACT, "SIGRETRACT" }, 604#endif 605#ifdef SIGSAK 606 { SIGSAK, "SIGSAK" }, 607#endif 608 { SIGSEGV, "SIGSEGV" }, 609#ifdef SIGSOUND 610 { SIGSOUND, "SIGSOUND" }, 611#endif 612#ifdef SIGSTKFLT 613 { SIGSTKFLT, "SIGSTKFLT" }, 614#endif 615 { SIGSTOP, "SIGSTOP" }, 616 { SIGSYS, "SIGSYS" }, 617#ifdef SIGSYSERROR 618 { SIGSYSERROR, "SIGSYSERROR" }, 619#endif 620#ifdef SIGTALRM 621 { SIGTALRM, "SIGTALRM" }, 622#endif 623 { SIGTERM, "SIGTERM" }, 624#ifdef SIGTHAW 625 { SIGTHAW, "SIGTHAW" }, 626#endif 627 { SIGTRAP, "SIGTRAP" }, 628#ifdef SIGTSTP 629 { SIGTSTP, "SIGTSTP" }, 630#endif 631 { SIGTTIN, "SIGTTIN" }, 632 { SIGTTOU, "SIGTTOU" }, 633#ifdef SIGURG 634 { SIGURG, "SIGURG" }, 635#endif 636 { SIGUSR1, "SIGUSR1" }, 637 { SIGUSR2, "SIGUSR2" }, 638#ifdef SIGVIRT 639 { SIGVIRT, "SIGVIRT" }, 640#endif 641 { SIGVTALRM, "SIGVTALRM" }, 642#ifdef SIGWAITING 643 { SIGWAITING, "SIGWAITING" }, 644#endif 645#ifdef SIGWINCH 646 { SIGWINCH, "SIGWINCH" }, 647#endif 648#ifdef SIGWINDOW 649 { SIGWINDOW, "SIGWINDOW" }, 650#endif 651 { SIGXCPU, "SIGXCPU" }, 652 { SIGXFSZ, "SIGXFSZ" }, 653#ifdef SIGXRES 654 { SIGXRES, "SIGXRES" }, 655#endif 656 { -1, NULL } 657}; 658 659// Returned string is a constant. For unknown signals "UNKNOWN" is returned. 660const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { 661 662 const char* ret = NULL; 663 664#ifdef SIGRTMIN 665 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { 666 if (sig == SIGRTMIN) { 667 ret = "SIGRTMIN"; 668 } else if (sig == SIGRTMAX) { 669 ret = "SIGRTMAX"; 670 } else { 671 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); 672 return out; 673 } 674 } 675#endif 676 677 if (sig > 0) { 678 for (int idx = 0; g_signal_info[idx].sig != -1; idx ++) { 679 if (g_signal_info[idx].sig == sig) { 680 ret = g_signal_info[idx].name; 681 break; 682 } 683 } 684 } 685 686 if (!ret) { 687 if (!is_valid_signal(sig)) { 688 ret = "INVALID"; 689 } else { 690 ret = "UNKNOWN"; 691 } 692 } 693 694 if (out && outlen > 0) { 695 strncpy(out, ret, outlen); 696 out[outlen - 1] = '\0'; 697 } 698 return out; 699} 700 701int os::Posix::get_signal_number(const char* signal_name) { 702 char tmp[30]; 703 const char* s = signal_name; 704 if (s[0] != 'S' || s[1] != 'I' || s[2] != 'G') { 705 jio_snprintf(tmp, sizeof(tmp), "SIG%s", signal_name); 706 s = tmp; 707 } 708 for (int idx = 0; g_signal_info[idx].sig != -1; idx ++) { 709 if (strcmp(g_signal_info[idx].name, s) == 0) { 710 return g_signal_info[idx].sig; 711 } 712 } 713 return -1; 714} 715 716int os::get_signal_number(const char* signal_name) { 717 return os::Posix::get_signal_number(signal_name); 718} 719 720// Returns true if signal number is valid. 721bool os::Posix::is_valid_signal(int sig) { 722 // MacOS not really POSIX compliant: sigaddset does not return 723 // an error for invalid signal numbers. However, MacOS does not 724 // support real time signals and simply seems to have just 33 725 // signals with no holes in the signal range. 726#ifdef __APPLE__ 727 return sig >= 1 && sig < NSIG; 728#else 729 // Use sigaddset to check for signal validity. 730 sigset_t set; 731 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { 732 return false; 733 } 734 return true; 735#endif 736} 737 738// Returns: 739// NULL for an invalid signal number 740// "SIG<num>" for a valid but unknown signal number 741// signal name otherwise. 742const char* os::exception_name(int sig, char* buf, size_t size) { 743 if (!os::Posix::is_valid_signal(sig)) { 744 return NULL; 745 } 746 const char* const name = os::Posix::get_signal_name(sig, buf, size); 747 if (strcmp(name, "UNKNOWN") == 0) { 748 jio_snprintf(buf, size, "SIG%d", sig); 749 } 750 return buf; 751} 752 753#define NUM_IMPORTANT_SIGS 32 754// Returns one-line short description of a signal set in a user provided buffer. 755const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { 756 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); 757 // Note: for shortness, just print out the first 32. That should 758 // cover most of the useful ones, apart from realtime signals. 759 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { 760 const int rc = sigismember(set, sig); 761 if (rc == -1 && errno == EINVAL) { 762 buffer[sig-1] = '?'; 763 } else { 764 buffer[sig-1] = rc == 0 ? '0' : '1'; 765 } 766 } 767 buffer[NUM_IMPORTANT_SIGS] = 0; 768 return buffer; 769} 770 771// Prints one-line description of a signal set. 772void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { 773 char buf[NUM_IMPORTANT_SIGS + 1]; 774 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); 775 st->print("%s", buf); 776} 777 778// Writes one-line description of a combination of sigaction.sa_flags into a user 779// provided buffer. Returns that buffer. 780const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { 781 char* p = buffer; 782 size_t remaining = size; 783 bool first = true; 784 int idx = 0; 785 786 assert(buffer, "invalid argument"); 787 788 if (size == 0) { 789 return buffer; 790 } 791 792 strncpy(buffer, "none", size); 793 794 const struct { 795 int i; 796 const char* s; 797 } flaginfo [] = { 798 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, 799 { SA_ONSTACK, "SA_ONSTACK" }, 800 { SA_RESETHAND, "SA_RESETHAND" }, 801 { SA_RESTART, "SA_RESTART" }, 802 { SA_SIGINFO, "SA_SIGINFO" }, 803 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, 804 { SA_NODEFER, "SA_NODEFER" }, 805#ifdef AIX 806 { SA_ONSTACK, "SA_ONSTACK" }, 807 { SA_OLDSTYLE, "SA_OLDSTYLE" }, 808#endif 809 { 0, NULL } 810 }; 811 812 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { 813 if (flags & flaginfo[idx].i) { 814 if (first) { 815 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); 816 first = false; 817 } else { 818 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); 819 } 820 const size_t len = strlen(p); 821 p += len; 822 remaining -= len; 823 } 824 } 825 826 buffer[size - 1] = '\0'; 827 828 return buffer; 829} 830 831// Prints one-line description of a combination of sigaction.sa_flags. 832void os::Posix::print_sa_flags(outputStream* st, int flags) { 833 char buffer[0x100]; 834 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); 835 st->print("%s", buffer); 836} 837 838// Helper function for os::Posix::print_siginfo_...(): 839// return a textual description for signal code. 840struct enum_sigcode_desc_t { 841 const char* s_name; 842 const char* s_desc; 843}; 844 845static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { 846 847 const struct { 848 int sig; int code; const char* s_code; const char* s_desc; 849 } t1 [] = { 850 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, 851 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, 852 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, 853 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, 854 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, 855 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, 856 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, 857 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, 858#if defined(IA64) && defined(LINUX) 859 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, 860 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, 861#endif 862 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, 863 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, 864 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, 865 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, 866 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, 867 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, 868 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, 869 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, 870 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, 871 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, 872#ifdef AIX 873 // no explanation found what keyerr would be 874 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, 875#endif 876#if defined(IA64) && !defined(AIX) 877 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, 878#endif 879#if defined(__sparc) && defined(SOLARIS) 880// define Solaris Sparc M7 ADI SEGV signals 881#if !defined(SEGV_ACCADI) 882#define SEGV_ACCADI 3 883#endif 884 { SIGSEGV, SEGV_ACCADI, "SEGV_ACCADI", "ADI not enabled for mapped object." }, 885#if !defined(SEGV_ACCDERR) 886#define SEGV_ACCDERR 4 887#endif 888 { SIGSEGV, SEGV_ACCDERR, "SEGV_ACCDERR", "ADI disrupting exception." }, 889#if !defined(SEGV_ACCPERR) 890#define SEGV_ACCPERR 5 891#endif 892 { SIGSEGV, SEGV_ACCPERR, "SEGV_ACCPERR", "ADI precise exception." }, 893#endif // defined(__sparc) && defined(SOLARIS) 894 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, 895 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, 896 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, 897 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, 898 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, 899 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, 900 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, 901 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, 902 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, 903 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, 904 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, 905#ifdef SIGPOLL 906 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, 907 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, 908 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, 909 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, 910 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, 911#endif 912 { -1, -1, NULL, NULL } 913 }; 914 915 // Codes valid in any signal context. 916 const struct { 917 int code; const char* s_code; const char* s_desc; 918 } t2 [] = { 919 { SI_USER, "SI_USER", "Signal sent by kill()." }, 920 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, 921 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, 922 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, 923 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, 924 // Linux specific 925#ifdef SI_TKILL 926 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, 927#endif 928#ifdef SI_DETHREAD 929 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, 930#endif 931#ifdef SI_KERNEL 932 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, 933#endif 934#ifdef SI_SIGIO 935 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, 936#endif 937 938#ifdef AIX 939 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, 940 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, 941#endif 942 943#ifdef __sun 944 { SI_NOINFO, "SI_NOINFO", "No signal information" }, 945 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, 946 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, 947#endif 948 949 { -1, NULL, NULL } 950 }; 951 952 const char* s_code = NULL; 953 const char* s_desc = NULL; 954 955 for (int i = 0; t1[i].sig != -1; i ++) { 956 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { 957 s_code = t1[i].s_code; 958 s_desc = t1[i].s_desc; 959 break; 960 } 961 } 962 963 if (s_code == NULL) { 964 for (int i = 0; t2[i].s_code != NULL; i ++) { 965 if (t2[i].code == si->si_code) { 966 s_code = t2[i].s_code; 967 s_desc = t2[i].s_desc; 968 } 969 } 970 } 971 972 if (s_code == NULL) { 973 out->s_name = "unknown"; 974 out->s_desc = "unknown"; 975 return false; 976 } 977 978 out->s_name = s_code; 979 out->s_desc = s_desc; 980 981 return true; 982} 983 984void os::print_siginfo(outputStream* os, const void* si0) { 985 986 const siginfo_t* const si = (const siginfo_t*) si0; 987 988 char buf[20]; 989 os->print("siginfo:"); 990 991 if (!si) { 992 os->print(" <null>"); 993 return; 994 } 995 996 const int sig = si->si_signo; 997 998 os->print(" si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); 999 1000 enum_sigcode_desc_t ed; 1001 get_signal_code_description(si, &ed); 1002 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); 1003 1004 if (si->si_errno) { 1005 os->print(", si_errno: %d", si->si_errno); 1006 } 1007 1008 // Output additional information depending on the signal code. 1009 1010 // Note: Many implementations lump si_addr, si_pid, si_uid etc. together as unions, 1011 // so it depends on the context which member to use. For synchronous error signals, 1012 // we print si_addr, unless the signal was sent by another process or thread, in 1013 // which case we print out pid or tid of the sender. 1014 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { 1015 const pid_t pid = si->si_pid; 1016 os->print(", si_pid: %ld", (long) pid); 1017 if (IS_VALID_PID(pid)) { 1018 const pid_t me = getpid(); 1019 if (me == pid) { 1020 os->print(" (current process)"); 1021 } 1022 } else { 1023 os->print(" (invalid)"); 1024 } 1025 os->print(", si_uid: %ld", (long) si->si_uid); 1026 if (sig == SIGCHLD) { 1027 os->print(", si_status: %d", si->si_status); 1028 } 1029 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || 1030 sig == SIGTRAP || sig == SIGFPE) { 1031 os->print(", si_addr: " PTR_FORMAT, p2i(si->si_addr)); 1032#ifdef SIGPOLL 1033 } else if (sig == SIGPOLL) { 1034 os->print(", si_band: %ld", si->si_band); 1035#endif 1036 } 1037 1038} 1039 1040int os::Posix::unblock_thread_signal_mask(const sigset_t *set) { 1041 return pthread_sigmask(SIG_UNBLOCK, set, NULL); 1042} 1043 1044address os::Posix::ucontext_get_pc(const ucontext_t* ctx) { 1045#ifdef TARGET_OS_FAMILY_linux 1046 return Linux::ucontext_get_pc(ctx); 1047#elif defined(TARGET_OS_FAMILY_solaris) 1048 return Solaris::ucontext_get_pc(ctx); 1049#elif defined(TARGET_OS_FAMILY_aix) 1050 return Aix::ucontext_get_pc(ctx); 1051#elif defined(TARGET_OS_FAMILY_bsd) 1052 return Bsd::ucontext_get_pc(ctx); 1053#else 1054 VMError::report_and_die("unimplemented ucontext_get_pc"); 1055#endif 1056} 1057 1058void os::Posix::ucontext_set_pc(ucontext_t* ctx, address pc) { 1059#ifdef TARGET_OS_FAMILY_linux 1060 Linux::ucontext_set_pc(ctx, pc); 1061#elif defined(TARGET_OS_FAMILY_solaris) 1062 Solaris::ucontext_set_pc(ctx, pc); 1063#elif defined(TARGET_OS_FAMILY_aix) 1064 Aix::ucontext_set_pc(ctx, pc); 1065#elif defined(TARGET_OS_FAMILY_bsd) 1066 Bsd::ucontext_set_pc(ctx, pc); 1067#else 1068 VMError::report_and_die("unimplemented ucontext_get_pc"); 1069#endif 1070} 1071 1072 1073os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 1074 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 1075} 1076 1077/* 1078 * See the caveats for this class in os_posix.hpp 1079 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this 1080 * method and returns false. If none of the signals are raised, returns true. 1081 * The callback is supposed to provide the method that should be protected. 1082 */ 1083bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 1084 sigset_t saved_sig_mask; 1085 1086 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 1087 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 1088 "crash_protection already set?"); 1089 1090 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask 1091 // since on at least some systems (OS X) siglongjmp will restore the mask 1092 // for the process, not the thread 1093 pthread_sigmask(0, NULL, &saved_sig_mask); 1094 if (sigsetjmp(_jmpbuf, 0) == 0) { 1095 // make sure we can see in the signal handler that we have crash protection 1096 // installed 1097 WatcherThread::watcher_thread()->set_crash_protection(this); 1098 cb.call(); 1099 // and clear the crash protection 1100 WatcherThread::watcher_thread()->set_crash_protection(NULL); 1101 return true; 1102 } 1103 // this happens when we siglongjmp() back 1104 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); 1105 WatcherThread::watcher_thread()->set_crash_protection(NULL); 1106 return false; 1107} 1108 1109void os::WatcherThreadCrashProtection::restore() { 1110 assert(WatcherThread::watcher_thread()->has_crash_protection(), 1111 "must have crash protection"); 1112 1113 siglongjmp(_jmpbuf, 1); 1114} 1115 1116void os::WatcherThreadCrashProtection::check_crash_protection(int sig, 1117 Thread* thread) { 1118 1119 if (thread != NULL && 1120 thread->is_Watcher_thread() && 1121 WatcherThread::watcher_thread()->has_crash_protection()) { 1122 1123 if (sig == SIGSEGV || sig == SIGBUS) { 1124 WatcherThread::watcher_thread()->crash_protection()->restore(); 1125 } 1126 } 1127} 1128 1129#define check_with_errno(check_type, cond, msg) \ 1130 do { \ 1131 int err = errno; \ 1132 check_type(cond, "%s; error='%s' (errno=%d)", msg, strerror(err), err); \ 1133} while (false) 1134 1135#define assert_with_errno(cond, msg) check_with_errno(assert, cond, msg) 1136#define guarantee_with_errno(cond, msg) check_with_errno(guarantee, cond, msg) 1137 1138// POSIX unamed semaphores are not supported on OS X. 1139#ifndef __APPLE__ 1140 1141PosixSemaphore::PosixSemaphore(uint value) { 1142 int ret = sem_init(&_semaphore, 0, value); 1143 1144 guarantee_with_errno(ret == 0, "Failed to initialize semaphore"); 1145} 1146 1147PosixSemaphore::~PosixSemaphore() { 1148 sem_destroy(&_semaphore); 1149} 1150 1151void PosixSemaphore::signal(uint count) { 1152 for (uint i = 0; i < count; i++) { 1153 int ret = sem_post(&_semaphore); 1154 1155 assert_with_errno(ret == 0, "sem_post failed"); 1156 } 1157} 1158 1159void PosixSemaphore::wait() { 1160 int ret; 1161 1162 do { 1163 ret = sem_wait(&_semaphore); 1164 } while (ret != 0 && errno == EINTR); 1165 1166 assert_with_errno(ret == 0, "sem_wait failed"); 1167} 1168 1169bool PosixSemaphore::trywait() { 1170 int ret; 1171 1172 do { 1173 ret = sem_trywait(&_semaphore); 1174 } while (ret != 0 && errno == EINTR); 1175 1176 assert_with_errno(ret == 0 || errno == EAGAIN, "trywait failed"); 1177 1178 return ret == 0; 1179} 1180 1181bool PosixSemaphore::timedwait(struct timespec ts) { 1182 while (true) { 1183 int result = sem_timedwait(&_semaphore, &ts); 1184 if (result == 0) { 1185 return true; 1186 } else if (errno == EINTR) { 1187 continue; 1188 } else if (errno == ETIMEDOUT) { 1189 return false; 1190 } else { 1191 assert_with_errno(false, "timedwait failed"); 1192 return false; 1193 } 1194 } 1195} 1196 1197#endif // __APPLE__ 1198