1 /* 2 * Copyright (c) 1999, 2020, 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 // no precompiled headers 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logStream.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/filemap.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "os_bsd.inline.hpp" 41 #include "os_posix.inline.hpp" 42 #include "os_share_bsd.hpp" 43 #include "prims/jniFastGetField.hpp" 44 #include "prims/jvm_misc.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/atomic.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/interfaceSupport.inline.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/objectMonitor.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/semaphore.hpp" 57 #include "runtime/sharedRuntime.hpp" 58 #include "runtime/statSampler.hpp" 59 #include "runtime/stubRoutines.hpp" 60 #include "runtime/thread.inline.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/timer.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/vmError.hpp" 72 73 // put OS-includes here 74 # include <dlfcn.h> 75 # include <errno.h> 76 # include <fcntl.h> 77 # include <inttypes.h> 78 # include <poll.h> 79 # include <pthread.h> 80 # include <pwd.h> 81 # include <signal.h> 82 # include <stdint.h> 83 # include <stdio.h> 84 # include <string.h> 85 # include <sys/ioctl.h> 86 # include <sys/mman.h> 87 # include <sys/param.h> 88 # include <sys/resource.h> 89 # include <sys/socket.h> 90 # include <sys/stat.h> 91 # include <sys/syscall.h> 92 # include <sys/sysctl.h> 93 # include <sys/time.h> 94 # include <sys/times.h> 95 # include <sys/types.h> 96 # include <sys/wait.h> 97 # include <time.h> 98 # include <unistd.h> 99 100 #if defined(__FreeBSD__) || defined(__NetBSD__) 101 #include <elf.h> 102 #endif 103 104 #ifdef __APPLE__ 105 #include <mach-o/dyld.h> 106 #endif 107 108 #ifndef MAP_ANONYMOUS 109 #define MAP_ANONYMOUS MAP_ANON 110 #endif 111 112 #define MAX_PATH (2 * K) 113 114 // for timer info max values which include all bits 115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 116 117 //////////////////////////////////////////////////////////////////////////////// 118 // global variables 119 julong os::Bsd::_physical_memory = 0; 120 121 #ifdef __APPLE__ 122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 123 volatile uint64_t os::Bsd::_max_abstime = 0; 124 #else 125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 126 #endif 127 pthread_t os::Bsd::_main_thread; 128 int os::Bsd::_page_size = -1; 129 130 static jlong initial_time_count=0; 131 132 static int clock_tics_per_sec = 100; 133 134 // For diagnostics to print a message once. see run_periodic_checks 135 static sigset_t check_signal_done; 136 static bool check_signals = true; 137 138 // Signal number used to suspend/resume a thread 139 140 // do not use any signal number less than SIGSEGV, see 4355769 141 static int SR_signum = SIGUSR2; 142 sigset_t SR_sigset; 143 144 #ifdef __APPLE__ 145 static const int processor_id_unassigned = -1; 146 static const int processor_id_assigning = -2; 147 static const int processor_id_map_size = 256; 148 static volatile int processor_id_map[processor_id_map_size]; 149 static volatile int processor_id_next = 0; 150 #endif 151 152 //////////////////////////////////////////////////////////////////////////////// 153 // utility functions 154 155 static int SR_initialize(); 156 157 julong os::available_memory() { 158 return Bsd::available_memory(); 159 } 160 161 // available here means free 162 julong os::Bsd::available_memory() { 163 uint64_t available = physical_memory() >> 2; 164 #ifdef __APPLE__ 165 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 166 vm_statistics64_data_t vmstat; 167 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 168 (host_info64_t)&vmstat, &count); 169 assert(kerr == KERN_SUCCESS, 170 "host_statistics64 failed - check mach_host_self() and count"); 171 if (kerr == KERN_SUCCESS) { 172 available = vmstat.free_count * os::vm_page_size(); 173 } 174 #endif 175 return available; 176 } 177 178 // for more info see : 179 // https://man.openbsd.org/sysctl.2 180 void os::Bsd::print_uptime_info(outputStream* st) { 181 struct timeval boottime; 182 size_t len = sizeof(boottime); 183 int mib[2]; 184 mib[0] = CTL_KERN; 185 mib[1] = KERN_BOOTTIME; 186 187 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) { 188 time_t bootsec = boottime.tv_sec; 189 time_t currsec = time(NULL); 190 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec)); 191 } 192 } 193 194 julong os::physical_memory() { 195 return Bsd::physical_memory(); 196 } 197 198 // Return true if user is running as root. 199 200 bool os::have_special_privileges() { 201 static bool init = false; 202 static bool privileges = false; 203 if (!init) { 204 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 205 init = true; 206 } 207 return privileges; 208 } 209 210 211 212 // Cpu architecture string 213 #if defined(ZERO) 214 static char cpu_arch[] = ZERO_LIBARCH; 215 #elif defined(IA64) 216 static char cpu_arch[] = "ia64"; 217 #elif defined(IA32) 218 static char cpu_arch[] = "i386"; 219 #elif defined(AMD64) 220 static char cpu_arch[] = "amd64"; 221 #elif defined(ARM) 222 static char cpu_arch[] = "arm"; 223 #elif defined(PPC32) 224 static char cpu_arch[] = "ppc"; 225 #elif defined(SPARC) 226 #ifdef _LP64 227 static char cpu_arch[] = "sparcv9"; 228 #else 229 static char cpu_arch[] = "sparc"; 230 #endif 231 #else 232 #error Add appropriate cpu_arch setting 233 #endif 234 235 // Compiler variant 236 #ifdef COMPILER2 237 #define COMPILER_VARIANT "server" 238 #else 239 #define COMPILER_VARIANT "client" 240 #endif 241 242 243 void os::Bsd::initialize_system_info() { 244 int mib[2]; 245 size_t len; 246 int cpu_val; 247 julong mem_val; 248 249 // get processors count via hw.ncpus sysctl 250 mib[0] = CTL_HW; 251 mib[1] = HW_NCPU; 252 len = sizeof(cpu_val); 253 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 254 assert(len == sizeof(cpu_val), "unexpected data size"); 255 set_processor_count(cpu_val); 256 } else { 257 set_processor_count(1); // fallback 258 } 259 260 #ifdef __APPLE__ 261 // initialize processor id map 262 for (int i = 0; i < processor_id_map_size; i++) { 263 processor_id_map[i] = processor_id_unassigned; 264 } 265 #endif 266 267 // get physical memory via hw.memsize sysctl (hw.memsize is used 268 // since it returns a 64 bit value) 269 mib[0] = CTL_HW; 270 271 #if defined (HW_MEMSIZE) // Apple 272 mib[1] = HW_MEMSIZE; 273 #elif defined(HW_PHYSMEM) // Most of BSD 274 mib[1] = HW_PHYSMEM; 275 #elif defined(HW_REALMEM) // Old FreeBSD 276 mib[1] = HW_REALMEM; 277 #else 278 #error No ways to get physmem 279 #endif 280 281 len = sizeof(mem_val); 282 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 283 assert(len == sizeof(mem_val), "unexpected data size"); 284 _physical_memory = mem_val; 285 } else { 286 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 287 } 288 289 #ifdef __OpenBSD__ 290 { 291 // limit _physical_memory memory view on OpenBSD since 292 // datasize rlimit restricts us anyway. 293 struct rlimit limits; 294 getrlimit(RLIMIT_DATA, &limits); 295 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 296 } 297 #endif 298 } 299 300 #ifdef __APPLE__ 301 static const char *get_home() { 302 const char *home_dir = ::getenv("HOME"); 303 if ((home_dir == NULL) || (*home_dir == '\0')) { 304 struct passwd *passwd_info = getpwuid(geteuid()); 305 if (passwd_info != NULL) { 306 home_dir = passwd_info->pw_dir; 307 } 308 } 309 310 return home_dir; 311 } 312 #endif 313 314 void os::init_system_properties_values() { 315 // The next steps are taken in the product version: 316 // 317 // Obtain the JAVA_HOME value from the location of libjvm.so. 318 // This library should be located at: 319 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 320 // 321 // If "/jre/lib/" appears at the right place in the path, then we 322 // assume libjvm.so is installed in a JDK and we use this path. 323 // 324 // Otherwise exit with message: "Could not create the Java virtual machine." 325 // 326 // The following extra steps are taken in the debugging version: 327 // 328 // If "/jre/lib/" does NOT appear at the right place in the path 329 // instead of exit check for $JAVA_HOME environment variable. 330 // 331 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 332 // then we append a fake suffix "hotspot/libjvm.so" to this path so 333 // it looks like libjvm.so is installed there 334 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 335 // 336 // Otherwise exit. 337 // 338 // Important note: if the location of libjvm.so changes this 339 // code needs to be changed accordingly. 340 341 // See ld(1): 342 // The linker uses the following search paths to locate required 343 // shared libraries: 344 // 1: ... 345 // ... 346 // 7: The default directories, normally /lib and /usr/lib. 347 #ifndef DEFAULT_LIBPATH 348 #ifndef OVERRIDE_LIBPATH 349 #define DEFAULT_LIBPATH "/lib:/usr/lib" 350 #else 351 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH 352 #endif 353 #endif 354 355 // Base path of extensions installed on the system. 356 #define SYS_EXT_DIR "/usr/java/packages" 357 #define EXTENSIONS_DIR "/lib/ext" 358 359 #ifndef __APPLE__ 360 361 // Buffer that fits several sprintfs. 362 // Note that the space for the colon and the trailing null are provided 363 // by the nulls included by the sizeof operator. 364 const size_t bufsize = 365 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 366 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 367 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 368 369 // sysclasspath, java_home, dll_dir 370 { 371 char *pslash; 372 os::jvm_path(buf, bufsize); 373 374 // Found the full path to libjvm.so. 375 // Now cut the path to <java_home>/jre if we can. 376 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 377 pslash = strrchr(buf, '/'); 378 if (pslash != NULL) { 379 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 380 } 381 Arguments::set_dll_dir(buf); 382 383 if (pslash != NULL) { 384 pslash = strrchr(buf, '/'); 385 if (pslash != NULL) { 386 *pslash = '\0'; // Get rid of /<arch>. 387 pslash = strrchr(buf, '/'); 388 if (pslash != NULL) { 389 *pslash = '\0'; // Get rid of /lib. 390 } 391 } 392 } 393 Arguments::set_java_home(buf); 394 if (!set_boot_path('/', ':')) { 395 vm_exit_during_initialization("Failed setting boot class path.", NULL); 396 } 397 } 398 399 // Where to look for native libraries. 400 // 401 // Note: Due to a legacy implementation, most of the library path 402 // is set in the launcher. This was to accomodate linking restrictions 403 // on legacy Bsd implementations (which are no longer supported). 404 // Eventually, all the library path setting will be done here. 405 // 406 // However, to prevent the proliferation of improperly built native 407 // libraries, the new path component /usr/java/packages is added here. 408 // Eventually, all the library path setting will be done here. 409 { 410 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 411 // should always exist (until the legacy problem cited above is 412 // addressed). 413 const char *v = ::getenv("LD_LIBRARY_PATH"); 414 const char *v_colon = ":"; 415 if (v == NULL) { v = ""; v_colon = ""; } 416 // That's +1 for the colon and +1 for the trailing '\0'. 417 char *ld_library_path = NEW_C_HEAP_ARRAY(char, 418 strlen(v) + 1 + 419 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 420 mtInternal); 421 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 422 Arguments::set_library_path(ld_library_path); 423 FREE_C_HEAP_ARRAY(char, ld_library_path); 424 } 425 426 // Extensions directories. 427 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 428 Arguments::set_ext_dirs(buf); 429 430 FREE_C_HEAP_ARRAY(char, buf); 431 432 #else // __APPLE__ 433 434 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 435 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 436 437 const char *user_home_dir = get_home(); 438 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 439 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 440 sizeof(SYS_EXTENSIONS_DIRS); 441 442 // Buffer that fits several sprintfs. 443 // Note that the space for the colon and the trailing null are provided 444 // by the nulls included by the sizeof operator. 445 const size_t bufsize = 446 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 447 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 448 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 449 450 // sysclasspath, java_home, dll_dir 451 { 452 char *pslash; 453 os::jvm_path(buf, bufsize); 454 455 // Found the full path to libjvm.so. 456 // Now cut the path to <java_home>/jre if we can. 457 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 458 pslash = strrchr(buf, '/'); 459 if (pslash != NULL) { 460 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 461 } 462 #ifdef STATIC_BUILD 463 strcat(buf, "/lib"); 464 #endif 465 466 Arguments::set_dll_dir(buf); 467 468 if (pslash != NULL) { 469 pslash = strrchr(buf, '/'); 470 if (pslash != NULL) { 471 *pslash = '\0'; // Get rid of /lib. 472 } 473 } 474 Arguments::set_java_home(buf); 475 set_boot_path('/', ':'); 476 } 477 478 // Where to look for native libraries. 479 // 480 // Note: Due to a legacy implementation, most of the library path 481 // is set in the launcher. This was to accomodate linking restrictions 482 // on legacy Bsd implementations (which are no longer supported). 483 // Eventually, all the library path setting will be done here. 484 // 485 // However, to prevent the proliferation of improperly built native 486 // libraries, the new path component /usr/java/packages is added here. 487 // Eventually, all the library path setting will be done here. 488 { 489 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 490 // should always exist (until the legacy problem cited above is 491 // addressed). 492 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 493 // can specify a directory inside an app wrapper 494 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 495 const char *l_colon = ":"; 496 if (l == NULL) { l = ""; l_colon = ""; } 497 498 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 499 const char *v_colon = ":"; 500 if (v == NULL) { v = ""; v_colon = ""; } 501 502 // Apple's Java6 has "." at the beginning of java.library.path. 503 // OpenJDK on Windows has "." at the end of java.library.path. 504 // OpenJDK on Linux and Solaris don't have "." in java.library.path 505 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 506 // "." is appended to the end of java.library.path. Yes, this 507 // could cause a change in behavior, but Apple's Java6 behavior 508 // can be achieved by putting "." at the beginning of the 509 // JAVA_LIBRARY_PATH environment variable. 510 char *ld_library_path = NEW_C_HEAP_ARRAY(char, 511 strlen(v) + 1 + strlen(l) + 1 + 512 system_ext_size + 3, 513 mtInternal); 514 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 515 v, v_colon, l, l_colon, user_home_dir); 516 Arguments::set_library_path(ld_library_path); 517 FREE_C_HEAP_ARRAY(char, ld_library_path); 518 } 519 520 // Extensions directories. 521 // 522 // Note that the space for the colon and the trailing null are provided 523 // by the nulls included by the sizeof operator (so actually one byte more 524 // than necessary is allocated). 525 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 526 user_home_dir, Arguments::get_java_home()); 527 Arguments::set_ext_dirs(buf); 528 529 FREE_C_HEAP_ARRAY(char, buf); 530 531 #undef SYS_EXTENSIONS_DIR 532 #undef SYS_EXTENSIONS_DIRS 533 534 #endif // __APPLE__ 535 536 #undef SYS_EXT_DIR 537 #undef EXTENSIONS_DIR 538 } 539 540 //////////////////////////////////////////////////////////////////////////////// 541 // breakpoint support 542 543 void os::breakpoint() { 544 BREAKPOINT; 545 } 546 547 extern "C" void breakpoint() { 548 // use debugger to set breakpoint here 549 } 550 551 //////////////////////////////////////////////////////////////////////////////// 552 // signal support 553 554 debug_only(static bool signal_sets_initialized = false); 555 static sigset_t unblocked_sigs, vm_sigs; 556 557 void os::Bsd::signal_sets_init() { 558 // Should also have an assertion stating we are still single-threaded. 559 assert(!signal_sets_initialized, "Already initialized"); 560 // Fill in signals that are necessarily unblocked for all threads in 561 // the VM. Currently, we unblock the following signals: 562 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 563 // by -Xrs (=ReduceSignalUsage)); 564 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 565 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 566 // the dispositions or masks wrt these signals. 567 // Programs embedding the VM that want to use the above signals for their 568 // own purposes must, at this time, use the "-Xrs" option to prevent 569 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 570 // (See bug 4345157, and other related bugs). 571 // In reality, though, unblocking these signals is really a nop, since 572 // these signals are not blocked by default. 573 sigemptyset(&unblocked_sigs); 574 sigaddset(&unblocked_sigs, SIGILL); 575 sigaddset(&unblocked_sigs, SIGSEGV); 576 sigaddset(&unblocked_sigs, SIGBUS); 577 sigaddset(&unblocked_sigs, SIGFPE); 578 sigaddset(&unblocked_sigs, SR_signum); 579 580 if (!ReduceSignalUsage) { 581 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 582 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 583 584 } 585 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 586 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 587 } 588 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 589 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 590 } 591 } 592 // Fill in signals that are blocked by all but the VM thread. 593 sigemptyset(&vm_sigs); 594 if (!ReduceSignalUsage) { 595 sigaddset(&vm_sigs, BREAK_SIGNAL); 596 } 597 debug_only(signal_sets_initialized = true); 598 599 } 600 601 // These are signals that are unblocked while a thread is running Java. 602 // (For some reason, they get blocked by default.) 603 sigset_t* os::Bsd::unblocked_signals() { 604 assert(signal_sets_initialized, "Not initialized"); 605 return &unblocked_sigs; 606 } 607 608 // These are the signals that are blocked while a (non-VM) thread is 609 // running Java. Only the VM thread handles these signals. 610 sigset_t* os::Bsd::vm_signals() { 611 assert(signal_sets_initialized, "Not initialized"); 612 return &vm_sigs; 613 } 614 615 void os::Bsd::hotspot_sigmask(Thread* thread) { 616 617 //Save caller's signal mask before setting VM signal mask 618 sigset_t caller_sigmask; 619 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 620 621 OSThread* osthread = thread->osthread(); 622 osthread->set_caller_sigmask(caller_sigmask); 623 624 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 625 626 if (!ReduceSignalUsage) { 627 if (thread->is_VM_thread()) { 628 // Only the VM thread handles BREAK_SIGNAL ... 629 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 630 } else { 631 // ... all other threads block BREAK_SIGNAL 632 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 633 } 634 } 635 } 636 637 638 ////////////////////////////////////////////////////////////////////////////// 639 // create new thread 640 641 #ifdef __APPLE__ 642 // library handle for calling objc_registerThreadWithCollector() 643 // without static linking to the libobjc library 644 #define OBJC_LIB "/usr/lib/libobjc.dylib" 645 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 646 typedef void (*objc_registerThreadWithCollector_t)(); 647 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 648 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 649 #endif 650 651 // Thread start routine for all newly created threads 652 static void *thread_native_entry(Thread *thread) { 653 654 thread->record_stack_base_and_size(); 655 656 // Try to randomize the cache line index of hot stack frames. 657 // This helps when threads of the same stack traces evict each other's 658 // cache lines. The threads can be either from the same JVM instance, or 659 // from different JVM instances. The benefit is especially true for 660 // processors with hyperthreading technology. 661 static int counter = 0; 662 int pid = os::current_process_id(); 663 alloca(((pid ^ counter++) & 7) * 128); 664 665 thread->initialize_thread_current(); 666 667 OSThread* osthread = thread->osthread(); 668 Monitor* sync = osthread->startThread_lock(); 669 670 osthread->set_thread_id(os::Bsd::gettid()); 671 672 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 673 os::current_thread_id(), (uintx) pthread_self()); 674 675 #ifdef __APPLE__ 676 // Store unique OS X thread id used by SA 677 osthread->set_unique_thread_id(); 678 #endif 679 680 // initialize signal mask for this thread 681 os::Bsd::hotspot_sigmask(thread); 682 683 // initialize floating point control register 684 os::Bsd::init_thread_fpu_state(); 685 686 #ifdef __APPLE__ 687 // register thread with objc gc 688 if (objc_registerThreadWithCollectorFunction != NULL) { 689 objc_registerThreadWithCollectorFunction(); 690 } 691 #endif 692 693 // handshaking with parent thread 694 { 695 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag); 696 697 // notify parent thread 698 osthread->set_state(INITIALIZED); 699 sync->notify_all(); 700 701 // wait until os::start_thread() 702 while (osthread->get_state() == INITIALIZED) { 703 sync->wait_without_safepoint_check(); 704 } 705 } 706 707 // call one more level start routine 708 thread->call_run(); 709 710 // Note: at this point the thread object may already have deleted itself. 711 // Prevent dereferencing it from here on out. 712 thread = NULL; 713 714 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 715 os::current_thread_id(), (uintx) pthread_self()); 716 717 return 0; 718 } 719 720 bool os::create_thread(Thread* thread, ThreadType thr_type, 721 size_t req_stack_size) { 722 assert(thread->osthread() == NULL, "caller responsible"); 723 724 // Allocate the OSThread object 725 OSThread* osthread = new OSThread(NULL, NULL); 726 if (osthread == NULL) { 727 return false; 728 } 729 730 // set the correct thread state 731 osthread->set_thread_type(thr_type); 732 733 // Initial state is ALLOCATED but not INITIALIZED 734 osthread->set_state(ALLOCATED); 735 736 thread->set_osthread(osthread); 737 738 // init thread attributes 739 pthread_attr_t attr; 740 pthread_attr_init(&attr); 741 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 742 743 // calculate stack size if it's not specified by caller 744 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 745 int status = pthread_attr_setstacksize(&attr, stack_size); 746 assert_status(status == 0, status, "pthread_attr_setstacksize"); 747 748 ThreadState state; 749 750 { 751 pthread_t tid; 752 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 753 754 char buf[64]; 755 if (ret == 0) { 756 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 757 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 758 } else { 759 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 760 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 761 // Log some OS information which might explain why creating the thread failed. 762 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 763 LogStream st(Log(os, thread)::info()); 764 os::Posix::print_rlimit_info(&st); 765 os::print_memory_info(&st); 766 } 767 768 pthread_attr_destroy(&attr); 769 770 if (ret != 0) { 771 // Need to clean up stuff we've allocated so far 772 thread->set_osthread(NULL); 773 delete osthread; 774 return false; 775 } 776 777 // Store pthread info into the OSThread 778 osthread->set_pthread_id(tid); 779 780 // Wait until child thread is either initialized or aborted 781 { 782 Monitor* sync_with_child = osthread->startThread_lock(); 783 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag); 784 while ((state = osthread->get_state()) == ALLOCATED) { 785 sync_with_child->wait_without_safepoint_check(); 786 } 787 } 788 789 } 790 791 // Aborted due to thread limit being reached 792 if (state == ZOMBIE) { 793 thread->set_osthread(NULL); 794 delete osthread; 795 return false; 796 } 797 798 // The thread is returned suspended (in state INITIALIZED), 799 // and is started higher up in the call chain 800 assert(state == INITIALIZED, "race condition"); 801 return true; 802 } 803 804 ///////////////////////////////////////////////////////////////////////////// 805 // attach existing thread 806 807 // bootstrap the main thread 808 bool os::create_main_thread(JavaThread* thread) { 809 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 810 return create_attached_thread(thread); 811 } 812 813 bool os::create_attached_thread(JavaThread* thread) { 814 #ifdef ASSERT 815 thread->verify_not_published(); 816 #endif 817 818 // Allocate the OSThread object 819 OSThread* osthread = new OSThread(NULL, NULL); 820 821 if (osthread == NULL) { 822 return false; 823 } 824 825 osthread->set_thread_id(os::Bsd::gettid()); 826 827 #ifdef __APPLE__ 828 // Store unique OS X thread id used by SA 829 osthread->set_unique_thread_id(); 830 #endif 831 832 // Store pthread info into the OSThread 833 osthread->set_pthread_id(::pthread_self()); 834 835 // initialize floating point control register 836 os::Bsd::init_thread_fpu_state(); 837 838 // Initial thread state is RUNNABLE 839 osthread->set_state(RUNNABLE); 840 841 thread->set_osthread(osthread); 842 843 // initialize signal mask for this thread 844 // and save the caller's signal mask 845 os::Bsd::hotspot_sigmask(thread); 846 847 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 848 os::current_thread_id(), (uintx) pthread_self()); 849 850 return true; 851 } 852 853 void os::pd_start_thread(Thread* thread) { 854 OSThread * osthread = thread->osthread(); 855 assert(osthread->get_state() != INITIALIZED, "just checking"); 856 Monitor* sync_with_child = osthread->startThread_lock(); 857 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag); 858 sync_with_child->notify(); 859 } 860 861 // Free Bsd resources related to the OSThread 862 void os::free_thread(OSThread* osthread) { 863 assert(osthread != NULL, "osthread not set"); 864 865 // We are told to free resources of the argument thread, 866 // but we can only really operate on the current thread. 867 assert(Thread::current()->osthread() == osthread, 868 "os::free_thread but not current thread"); 869 870 // Restore caller's signal mask 871 sigset_t sigmask = osthread->caller_sigmask(); 872 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 873 874 delete osthread; 875 } 876 877 //////////////////////////////////////////////////////////////////////////////// 878 // time support 879 880 // Time since start-up in seconds to a fine granularity. 881 // Used by VMSelfDestructTimer and the MemProfiler. 882 double os::elapsedTime() { 883 884 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 885 } 886 887 jlong os::elapsed_counter() { 888 return javaTimeNanos() - initial_time_count; 889 } 890 891 jlong os::elapsed_frequency() { 892 return NANOSECS_PER_SEC; // nanosecond resolution 893 } 894 895 bool os::supports_vtime() { return true; } 896 897 double os::elapsedVTime() { 898 // better than nothing, but not much 899 return elapsedTime(); 900 } 901 902 jlong os::javaTimeMillis() { 903 timeval time; 904 int status = gettimeofday(&time, NULL); 905 assert(status != -1, "bsd error"); 906 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 907 } 908 909 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 910 timeval time; 911 int status = gettimeofday(&time, NULL); 912 assert(status != -1, "bsd error"); 913 seconds = jlong(time.tv_sec); 914 nanos = jlong(time.tv_usec) * 1000; 915 } 916 917 #ifndef __APPLE__ 918 #ifndef CLOCK_MONOTONIC 919 #define CLOCK_MONOTONIC (1) 920 #endif 921 #endif 922 923 #ifdef __APPLE__ 924 void os::Bsd::clock_init() { 925 mach_timebase_info(&_timebase_info); 926 } 927 #else 928 void os::Bsd::clock_init() { 929 struct timespec res; 930 struct timespec tp; 931 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 932 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 933 // yes, monotonic clock is supported 934 _clock_gettime = ::clock_gettime; 935 } 936 } 937 #endif 938 939 940 941 #ifdef __APPLE__ 942 943 jlong os::javaTimeNanos() { 944 const uint64_t tm = mach_absolute_time(); 945 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 946 const uint64_t prev = Bsd::_max_abstime; 947 if (now <= prev) { 948 return prev; // same or retrograde time; 949 } 950 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now); 951 assert(obsv >= prev, "invariant"); // Monotonicity 952 // If the CAS succeeded then we're done and return "now". 953 // If the CAS failed and the observed value "obsv" is >= now then 954 // we should return "obsv". If the CAS failed and now > obsv > prv then 955 // some other thread raced this thread and installed a new value, in which case 956 // we could either (a) retry the entire operation, (b) retry trying to install now 957 // or (c) just return obsv. We use (c). No loop is required although in some cases 958 // we might discard a higher "now" value in deference to a slightly lower but freshly 959 // installed obsv value. That's entirely benign -- it admits no new orderings compared 960 // to (a) or (b) -- and greatly reduces coherence traffic. 961 // We might also condition (c) on the magnitude of the delta between obsv and now. 962 // Avoiding excessive CAS operations to hot RW locations is critical. 963 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 964 return (prev == obsv) ? now : obsv; 965 } 966 967 #else // __APPLE__ 968 969 jlong os::javaTimeNanos() { 970 if (os::supports_monotonic_clock()) { 971 struct timespec tp; 972 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 973 assert(status == 0, "gettime error"); 974 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 975 return result; 976 } else { 977 timeval time; 978 int status = gettimeofday(&time, NULL); 979 assert(status != -1, "bsd error"); 980 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 981 return 1000 * usecs; 982 } 983 } 984 985 #endif // __APPLE__ 986 987 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 988 if (os::supports_monotonic_clock()) { 989 info_ptr->max_value = ALL_64_BITS; 990 991 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 992 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 993 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 994 } else { 995 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 996 info_ptr->max_value = ALL_64_BITS; 997 998 // gettimeofday is a real time clock so it skips 999 info_ptr->may_skip_backward = true; 1000 info_ptr->may_skip_forward = true; 1001 } 1002 1003 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1004 } 1005 1006 // Return the real, user, and system times in seconds from an 1007 // arbitrary fixed point in the past. 1008 bool os::getTimesSecs(double* process_real_time, 1009 double* process_user_time, 1010 double* process_system_time) { 1011 struct tms ticks; 1012 clock_t real_ticks = times(&ticks); 1013 1014 if (real_ticks == (clock_t) (-1)) { 1015 return false; 1016 } else { 1017 double ticks_per_second = (double) clock_tics_per_sec; 1018 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1019 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1020 *process_real_time = ((double) real_ticks) / ticks_per_second; 1021 1022 return true; 1023 } 1024 } 1025 1026 1027 char * os::local_time_string(char *buf, size_t buflen) { 1028 struct tm t; 1029 time_t long_time; 1030 time(&long_time); 1031 localtime_r(&long_time, &t); 1032 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1033 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1034 t.tm_hour, t.tm_min, t.tm_sec); 1035 return buf; 1036 } 1037 1038 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1039 return localtime_r(clock, res); 1040 } 1041 1042 //////////////////////////////////////////////////////////////////////////////// 1043 // runtime exit support 1044 1045 // Note: os::shutdown() might be called very early during initialization, or 1046 // called from signal handler. Before adding something to os::shutdown(), make 1047 // sure it is async-safe and can handle partially initialized VM. 1048 void os::shutdown() { 1049 1050 // allow PerfMemory to attempt cleanup of any persistent resources 1051 perfMemory_exit(); 1052 1053 // needs to remove object in file system 1054 AttachListener::abort(); 1055 1056 // flush buffered output, finish log files 1057 ostream_abort(); 1058 1059 // Check for abort hook 1060 abort_hook_t abort_hook = Arguments::abort_hook(); 1061 if (abort_hook != NULL) { 1062 abort_hook(); 1063 } 1064 1065 } 1066 1067 // Note: os::abort() might be called very early during initialization, or 1068 // called from signal handler. Before adding something to os::abort(), make 1069 // sure it is async-safe and can handle partially initialized VM. 1070 void os::abort(bool dump_core, void* siginfo, const void* context) { 1071 os::shutdown(); 1072 if (dump_core) { 1073 #ifndef PRODUCT 1074 fdStream out(defaultStream::output_fd()); 1075 out.print_raw("Current thread is "); 1076 char buf[16]; 1077 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1078 out.print_raw_cr(buf); 1079 out.print_raw_cr("Dumping core ..."); 1080 #endif 1081 ::abort(); // dump core 1082 } 1083 1084 ::exit(1); 1085 } 1086 1087 // Die immediately, no exit hook, no abort hook, no cleanup. 1088 // Dump a core file, if possible, for debugging. 1089 void os::die() { 1090 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1091 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1092 // and don't take the time to generate a core file. 1093 os::signal_raise(SIGKILL); 1094 } else { 1095 // _exit() on BsdThreads only kills current thread 1096 ::abort(); 1097 } 1098 } 1099 1100 // Information of current thread in variety of formats 1101 pid_t os::Bsd::gettid() { 1102 int retval = -1; 1103 1104 #ifdef __APPLE__ // XNU kernel 1105 mach_port_t port = mach_thread_self(); 1106 guarantee(MACH_PORT_VALID(port), "just checking"); 1107 mach_port_deallocate(mach_task_self(), port); 1108 return (pid_t)port; 1109 1110 #else 1111 #ifdef __FreeBSD__ 1112 retval = syscall(SYS_thr_self); 1113 #else 1114 #ifdef __OpenBSD__ 1115 retval = syscall(SYS_getthrid); 1116 #else 1117 #ifdef __NetBSD__ 1118 retval = (pid_t) syscall(SYS__lwp_self); 1119 #endif 1120 #endif 1121 #endif 1122 #endif 1123 1124 if (retval == -1) { 1125 return getpid(); 1126 } 1127 } 1128 1129 intx os::current_thread_id() { 1130 #ifdef __APPLE__ 1131 return (intx)os::Bsd::gettid(); 1132 #else 1133 return (intx)::pthread_self(); 1134 #endif 1135 } 1136 1137 int os::current_process_id() { 1138 return (int)(getpid()); 1139 } 1140 1141 // DLL functions 1142 1143 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1144 1145 // This must be hard coded because it's the system's temporary 1146 // directory not the java application's temp directory, ala java.io.tmpdir. 1147 #ifdef __APPLE__ 1148 // macosx has a secure per-user temporary directory 1149 char temp_path_storage[PATH_MAX]; 1150 const char* os::get_temp_directory() { 1151 static char *temp_path = NULL; 1152 if (temp_path == NULL) { 1153 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1154 if (pathSize == 0 || pathSize > PATH_MAX) { 1155 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1156 } 1157 temp_path = temp_path_storage; 1158 } 1159 return temp_path; 1160 } 1161 #else // __APPLE__ 1162 const char* os::get_temp_directory() { return "/tmp"; } 1163 #endif // __APPLE__ 1164 1165 // check if addr is inside libjvm.so 1166 bool os::address_is_in_vm(address addr) { 1167 static address libjvm_base_addr; 1168 Dl_info dlinfo; 1169 1170 if (libjvm_base_addr == NULL) { 1171 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1172 libjvm_base_addr = (address)dlinfo.dli_fbase; 1173 } 1174 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1175 } 1176 1177 if (dladdr((void *)addr, &dlinfo) != 0) { 1178 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1179 } 1180 1181 return false; 1182 } 1183 1184 1185 #define MACH_MAXSYMLEN 256 1186 1187 bool os::dll_address_to_function_name(address addr, char *buf, 1188 int buflen, int *offset, 1189 bool demangle) { 1190 // buf is not optional, but offset is optional 1191 assert(buf != NULL, "sanity check"); 1192 1193 Dl_info dlinfo; 1194 char localbuf[MACH_MAXSYMLEN]; 1195 1196 if (dladdr((void*)addr, &dlinfo) != 0) { 1197 // see if we have a matching symbol 1198 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1199 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1200 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1201 } 1202 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1203 return true; 1204 } 1205 // no matching symbol so try for just file info 1206 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1207 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1208 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1209 return true; 1210 } 1211 } 1212 1213 // Handle non-dynamic manually: 1214 if (dlinfo.dli_fbase != NULL && 1215 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1216 dlinfo.dli_fbase)) { 1217 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1218 jio_snprintf(buf, buflen, "%s", localbuf); 1219 } 1220 return true; 1221 } 1222 } 1223 buf[0] = '\0'; 1224 if (offset != NULL) *offset = -1; 1225 return false; 1226 } 1227 1228 // ported from solaris version 1229 bool os::dll_address_to_library_name(address addr, char* buf, 1230 int buflen, int* offset) { 1231 // buf is not optional, but offset is optional 1232 assert(buf != NULL, "sanity check"); 1233 1234 Dl_info dlinfo; 1235 1236 if (dladdr((void*)addr, &dlinfo) != 0) { 1237 if (dlinfo.dli_fname != NULL) { 1238 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1239 } 1240 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1241 *offset = addr - (address)dlinfo.dli_fbase; 1242 } 1243 return true; 1244 } 1245 1246 buf[0] = '\0'; 1247 if (offset) *offset = -1; 1248 return false; 1249 } 1250 1251 // Loads .dll/.so and 1252 // in case of error it checks if .dll/.so was built for the 1253 // same architecture as Hotspot is running on 1254 1255 #ifdef __APPLE__ 1256 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1257 #ifdef STATIC_BUILD 1258 return os::get_default_process_handle(); 1259 #else 1260 log_info(os)("attempting shared library load of %s", filename); 1261 1262 void * result= ::dlopen(filename, RTLD_LAZY); 1263 if (result != NULL) { 1264 Events::log(NULL, "Loaded shared library %s", filename); 1265 // Successful loading 1266 log_info(os)("shared library load of %s was successful", filename); 1267 return result; 1268 } 1269 1270 const char* error_report = ::dlerror(); 1271 if (error_report == NULL) { 1272 error_report = "dlerror returned no error description"; 1273 } 1274 if (ebuf != NULL && ebuflen > 0) { 1275 // Read system error message into ebuf 1276 ::strncpy(ebuf, error_report, ebuflen-1); 1277 ebuf[ebuflen-1]='\0'; 1278 } 1279 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1280 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1281 1282 return NULL; 1283 #endif // STATIC_BUILD 1284 } 1285 #else 1286 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1287 #ifdef STATIC_BUILD 1288 return os::get_default_process_handle(); 1289 #else 1290 log_info(os)("attempting shared library load of %s", filename); 1291 void * result= ::dlopen(filename, RTLD_LAZY); 1292 if (result != NULL) { 1293 Events::log(NULL, "Loaded shared library %s", filename); 1294 // Successful loading 1295 log_info(os)("shared library load of %s was successful", filename); 1296 return result; 1297 } 1298 1299 Elf32_Ehdr elf_head; 1300 1301 const char* const error_report = ::dlerror(); 1302 if (error_report == NULL) { 1303 error_report = "dlerror returned no error description"; 1304 } 1305 if (ebuf != NULL && ebuflen > 0) { 1306 // Read system error message into ebuf 1307 ::strncpy(ebuf, error_report, ebuflen-1); 1308 ebuf[ebuflen-1]='\0'; 1309 } 1310 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1311 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1312 1313 int diag_msg_max_length=ebuflen-strlen(ebuf); 1314 char* diag_msg_buf=ebuf+strlen(ebuf); 1315 1316 if (diag_msg_max_length==0) { 1317 // No more space in ebuf for additional diagnostics message 1318 return NULL; 1319 } 1320 1321 1322 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1323 1324 if (file_descriptor < 0) { 1325 // Can't open library, report dlerror() message 1326 return NULL; 1327 } 1328 1329 bool failed_to_read_elf_head= 1330 (sizeof(elf_head)!= 1331 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1332 1333 ::close(file_descriptor); 1334 if (failed_to_read_elf_head) { 1335 // file i/o error - report dlerror() msg 1336 return NULL; 1337 } 1338 1339 typedef struct { 1340 Elf32_Half code; // Actual value as defined in elf.h 1341 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1342 char elf_class; // 32 or 64 bit 1343 char endianess; // MSB or LSB 1344 char* name; // String representation 1345 } arch_t; 1346 1347 #ifndef EM_486 1348 #define EM_486 6 /* Intel 80486 */ 1349 #endif 1350 1351 #ifndef EM_MIPS_RS3_LE 1352 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1353 #endif 1354 1355 #ifndef EM_PPC64 1356 #define EM_PPC64 21 /* PowerPC64 */ 1357 #endif 1358 1359 #ifndef EM_S390 1360 #define EM_S390 22 /* IBM System/390 */ 1361 #endif 1362 1363 #ifndef EM_IA_64 1364 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1365 #endif 1366 1367 #ifndef EM_X86_64 1368 #define EM_X86_64 62 /* AMD x86-64 */ 1369 #endif 1370 1371 static const arch_t arch_array[]={ 1372 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1373 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1374 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1375 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1376 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1377 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1378 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1379 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1380 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1381 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1382 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1383 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1384 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1385 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1386 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1387 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1388 }; 1389 1390 #if (defined IA32) 1391 static Elf32_Half running_arch_code=EM_386; 1392 #elif (defined AMD64) 1393 static Elf32_Half running_arch_code=EM_X86_64; 1394 #elif (defined IA64) 1395 static Elf32_Half running_arch_code=EM_IA_64; 1396 #elif (defined __sparc) && (defined _LP64) 1397 static Elf32_Half running_arch_code=EM_SPARCV9; 1398 #elif (defined __sparc) && (!defined _LP64) 1399 static Elf32_Half running_arch_code=EM_SPARC; 1400 #elif (defined __powerpc64__) 1401 static Elf32_Half running_arch_code=EM_PPC64; 1402 #elif (defined __powerpc__) 1403 static Elf32_Half running_arch_code=EM_PPC; 1404 #elif (defined ARM) 1405 static Elf32_Half running_arch_code=EM_ARM; 1406 #elif (defined S390) 1407 static Elf32_Half running_arch_code=EM_S390; 1408 #elif (defined ALPHA) 1409 static Elf32_Half running_arch_code=EM_ALPHA; 1410 #elif (defined MIPSEL) 1411 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1412 #elif (defined PARISC) 1413 static Elf32_Half running_arch_code=EM_PARISC; 1414 #elif (defined MIPS) 1415 static Elf32_Half running_arch_code=EM_MIPS; 1416 #elif (defined M68K) 1417 static Elf32_Half running_arch_code=EM_68K; 1418 #else 1419 #error Method os::dll_load requires that one of following is defined:\ 1420 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1421 #endif 1422 1423 // Identify compatability class for VM's architecture and library's architecture 1424 // Obtain string descriptions for architectures 1425 1426 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1427 int running_arch_index=-1; 1428 1429 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1430 if (running_arch_code == arch_array[i].code) { 1431 running_arch_index = i; 1432 } 1433 if (lib_arch.code == arch_array[i].code) { 1434 lib_arch.compat_class = arch_array[i].compat_class; 1435 lib_arch.name = arch_array[i].name; 1436 } 1437 } 1438 1439 assert(running_arch_index != -1, 1440 "Didn't find running architecture code (running_arch_code) in arch_array"); 1441 if (running_arch_index == -1) { 1442 // Even though running architecture detection failed 1443 // we may still continue with reporting dlerror() message 1444 return NULL; 1445 } 1446 1447 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1448 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1449 return NULL; 1450 } 1451 1452 #ifndef S390 1453 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1454 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1455 return NULL; 1456 } 1457 #endif // !S390 1458 1459 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1460 if (lib_arch.name!=NULL) { 1461 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1462 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1463 lib_arch.name, arch_array[running_arch_index].name); 1464 } else { 1465 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1466 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1467 lib_arch.code, 1468 arch_array[running_arch_index].name); 1469 } 1470 } 1471 1472 return NULL; 1473 #endif // STATIC_BUILD 1474 } 1475 #endif // !__APPLE__ 1476 1477 void* os::get_default_process_handle() { 1478 #ifdef __APPLE__ 1479 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1480 // to avoid finding unexpected symbols on second (or later) 1481 // loads of a library. 1482 return (void*)::dlopen(NULL, RTLD_FIRST); 1483 #else 1484 return (void*)::dlopen(NULL, RTLD_LAZY); 1485 #endif 1486 } 1487 1488 // XXX: Do we need a lock around this as per Linux? 1489 void* os::dll_lookup(void* handle, const char* name) { 1490 return dlsym(handle, name); 1491 } 1492 1493 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1494 outputStream * out = (outputStream *) param; 1495 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1496 return 0; 1497 } 1498 1499 void os::print_dll_info(outputStream *st) { 1500 st->print_cr("Dynamic libraries:"); 1501 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1502 st->print_cr("Error: Cannot print dynamic libraries."); 1503 } 1504 } 1505 1506 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1507 #ifdef RTLD_DI_LINKMAP 1508 Dl_info dli; 1509 void *handle; 1510 Link_map *map; 1511 Link_map *p; 1512 1513 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1514 dli.dli_fname == NULL) { 1515 return 1; 1516 } 1517 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1518 if (handle == NULL) { 1519 return 1; 1520 } 1521 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1522 if (map == NULL) { 1523 dlclose(handle); 1524 return 1; 1525 } 1526 1527 while (map->l_prev != NULL) 1528 map = map->l_prev; 1529 1530 while (map != NULL) { 1531 // Value for top_address is returned as 0 since we don't have any information about module size 1532 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1533 dlclose(handle); 1534 return 1; 1535 } 1536 map = map->l_next; 1537 } 1538 1539 dlclose(handle); 1540 #elif defined(__APPLE__) 1541 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1542 // Value for top_address is returned as 0 since we don't have any information about module size 1543 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1544 return 1; 1545 } 1546 } 1547 return 0; 1548 #else 1549 return 1; 1550 #endif 1551 } 1552 1553 void os::get_summary_os_info(char* buf, size_t buflen) { 1554 // These buffers are small because we want this to be brief 1555 // and not use a lot of stack while generating the hs_err file. 1556 char os[100]; 1557 size_t size = sizeof(os); 1558 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1559 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1560 #ifdef __APPLE__ 1561 strncpy(os, "Darwin", sizeof(os)); 1562 #elif __OpenBSD__ 1563 strncpy(os, "OpenBSD", sizeof(os)); 1564 #else 1565 strncpy(os, "BSD", sizeof(os)); 1566 #endif 1567 } 1568 1569 char release[100]; 1570 size = sizeof(release); 1571 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1572 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1573 // if error, leave blank 1574 strncpy(release, "", sizeof(release)); 1575 } 1576 snprintf(buf, buflen, "%s %s", os, release); 1577 } 1578 1579 void os::print_os_info_brief(outputStream* st) { 1580 os::Posix::print_uname_info(st); 1581 } 1582 1583 void os::print_os_info(outputStream* st) { 1584 st->print("OS:"); 1585 1586 os::Posix::print_uname_info(st); 1587 1588 os::Bsd::print_uptime_info(st); 1589 1590 os::Posix::print_rlimit_info(st); 1591 1592 os::Posix::print_load_average(st); 1593 1594 VM_Version::print_platform_virtualization_info(st); 1595 } 1596 1597 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1598 // Nothing to do for now. 1599 } 1600 1601 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1602 unsigned int mhz; 1603 size_t size = sizeof(mhz); 1604 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1605 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1606 mhz = 1; // looks like an error but can be divided by 1607 } else { 1608 mhz /= 1000000; // reported in millions 1609 } 1610 1611 char model[100]; 1612 size = sizeof(model); 1613 int mib_model[] = { CTL_HW, HW_MODEL }; 1614 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1615 strncpy(model, cpu_arch, sizeof(model)); 1616 } 1617 1618 char machine[100]; 1619 size = sizeof(machine); 1620 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1621 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1622 strncpy(machine, "", sizeof(machine)); 1623 } 1624 1625 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1626 } 1627 1628 void os::print_memory_info(outputStream* st) { 1629 xsw_usage swap_usage; 1630 size_t size = sizeof(swap_usage); 1631 1632 st->print("Memory:"); 1633 st->print(" %dk page", os::vm_page_size()>>10); 1634 1635 st->print(", physical " UINT64_FORMAT "k", 1636 os::physical_memory() >> 10); 1637 st->print("(" UINT64_FORMAT "k free)", 1638 os::available_memory() >> 10); 1639 1640 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) { 1641 if (size >= offset_of(xsw_usage, xsu_used)) { 1642 st->print(", swap " UINT64_FORMAT "k", 1643 ((julong) swap_usage.xsu_total) >> 10); 1644 st->print("(" UINT64_FORMAT "k free)", 1645 ((julong) swap_usage.xsu_avail) >> 10); 1646 } 1647 } 1648 1649 st->cr(); 1650 } 1651 1652 static void print_signal_handler(outputStream* st, int sig, 1653 char* buf, size_t buflen); 1654 1655 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1656 st->print_cr("Signal Handlers:"); 1657 print_signal_handler(st, SIGSEGV, buf, buflen); 1658 print_signal_handler(st, SIGBUS , buf, buflen); 1659 print_signal_handler(st, SIGFPE , buf, buflen); 1660 print_signal_handler(st, SIGPIPE, buf, buflen); 1661 print_signal_handler(st, SIGXFSZ, buf, buflen); 1662 print_signal_handler(st, SIGILL , buf, buflen); 1663 print_signal_handler(st, SR_signum, buf, buflen); 1664 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1665 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1666 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1667 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1668 } 1669 1670 static char saved_jvm_path[MAXPATHLEN] = {0}; 1671 1672 // Find the full path to the current module, libjvm 1673 void os::jvm_path(char *buf, jint buflen) { 1674 // Error checking. 1675 if (buflen < MAXPATHLEN) { 1676 assert(false, "must use a large-enough buffer"); 1677 buf[0] = '\0'; 1678 return; 1679 } 1680 // Lazy resolve the path to current module. 1681 if (saved_jvm_path[0] != 0) { 1682 strcpy(buf, saved_jvm_path); 1683 return; 1684 } 1685 1686 char dli_fname[MAXPATHLEN]; 1687 bool ret = dll_address_to_library_name( 1688 CAST_FROM_FN_PTR(address, os::jvm_path), 1689 dli_fname, sizeof(dli_fname), NULL); 1690 assert(ret, "cannot locate libjvm"); 1691 char *rp = NULL; 1692 if (ret && dli_fname[0] != '\0') { 1693 rp = os::Posix::realpath(dli_fname, buf, buflen); 1694 } 1695 if (rp == NULL) { 1696 return; 1697 } 1698 1699 if (Arguments::sun_java_launcher_is_altjvm()) { 1700 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1701 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1702 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1703 // appears at the right place in the string, then assume we are 1704 // installed in a JDK and we're done. Otherwise, check for a 1705 // JAVA_HOME environment variable and construct a path to the JVM 1706 // being overridden. 1707 1708 const char *p = buf + strlen(buf) - 1; 1709 for (int count = 0; p > buf && count < 5; ++count) { 1710 for (--p; p > buf && *p != '/'; --p) 1711 /* empty */ ; 1712 } 1713 1714 if (strncmp(p, "/jre/lib/", 9) != 0) { 1715 // Look for JAVA_HOME in the environment. 1716 char* java_home_var = ::getenv("JAVA_HOME"); 1717 if (java_home_var != NULL && java_home_var[0] != 0) { 1718 char* jrelib_p; 1719 int len; 1720 1721 // Check the current module name "libjvm" 1722 p = strrchr(buf, '/'); 1723 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1724 1725 rp = os::Posix::realpath(java_home_var, buf, buflen); 1726 if (rp == NULL) { 1727 return; 1728 } 1729 1730 // determine if this is a legacy image or modules image 1731 // modules image doesn't have "jre" subdirectory 1732 len = strlen(buf); 1733 assert(len < buflen, "Ran out of buffer space"); 1734 jrelib_p = buf + len; 1735 1736 // Add the appropriate library subdir 1737 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1738 if (0 != access(buf, F_OK)) { 1739 snprintf(jrelib_p, buflen-len, "/lib"); 1740 } 1741 1742 // Add the appropriate client or server subdir 1743 len = strlen(buf); 1744 jrelib_p = buf + len; 1745 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1746 if (0 != access(buf, F_OK)) { 1747 snprintf(jrelib_p, buflen-len, "%s", ""); 1748 } 1749 1750 // If the path exists within JAVA_HOME, add the JVM library name 1751 // to complete the path to JVM being overridden. Otherwise fallback 1752 // to the path to the current library. 1753 if (0 == access(buf, F_OK)) { 1754 // Use current module name "libjvm" 1755 len = strlen(buf); 1756 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1757 } else { 1758 // Fall back to path of current library 1759 rp = os::Posix::realpath(dli_fname, buf, buflen); 1760 if (rp == NULL) { 1761 return; 1762 } 1763 } 1764 } 1765 } 1766 } 1767 1768 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1769 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1770 } 1771 1772 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1773 // no prefix required, not even "_" 1774 } 1775 1776 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1777 // no suffix required 1778 } 1779 1780 //////////////////////////////////////////////////////////////////////////////// 1781 // sun.misc.Signal support 1782 1783 static void UserHandler(int sig, void *siginfo, void *context) { 1784 // Ctrl-C is pressed during error reporting, likely because the error 1785 // handler fails to abort. Let VM die immediately. 1786 if (sig == SIGINT && VMError::is_error_reported()) { 1787 os::die(); 1788 } 1789 1790 os::signal_notify(sig); 1791 } 1792 1793 void* os::user_handler() { 1794 return CAST_FROM_FN_PTR(void*, UserHandler); 1795 } 1796 1797 extern "C" { 1798 typedef void (*sa_handler_t)(int); 1799 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1800 } 1801 1802 void* os::signal(int signal_number, void* handler) { 1803 struct sigaction sigAct, oldSigAct; 1804 1805 sigfillset(&(sigAct.sa_mask)); 1806 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1807 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1808 1809 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1810 // -1 means registration failed 1811 return (void *)-1; 1812 } 1813 1814 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1815 } 1816 1817 void os::signal_raise(int signal_number) { 1818 ::raise(signal_number); 1819 } 1820 1821 // The following code is moved from os.cpp for making this 1822 // code platform specific, which it is by its very nature. 1823 1824 // Will be modified when max signal is changed to be dynamic 1825 int os::sigexitnum_pd() { 1826 return NSIG; 1827 } 1828 1829 // a counter for each possible signal value 1830 static volatile jint pending_signals[NSIG+1] = { 0 }; 1831 static Semaphore* sig_sem = NULL; 1832 1833 static void jdk_misc_signal_init() { 1834 // Initialize signal structures 1835 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1836 1837 // Initialize signal semaphore 1838 sig_sem = new Semaphore(); 1839 } 1840 1841 void os::signal_notify(int sig) { 1842 if (sig_sem != NULL) { 1843 Atomic::inc(&pending_signals[sig]); 1844 sig_sem->signal(); 1845 } else { 1846 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1847 // initialization isn't called. 1848 assert(ReduceSignalUsage, "signal semaphore should be created"); 1849 } 1850 } 1851 1852 static int check_pending_signals() { 1853 for (;;) { 1854 for (int i = 0; i < NSIG + 1; i++) { 1855 jint n = pending_signals[i]; 1856 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { 1857 return i; 1858 } 1859 } 1860 JavaThread *thread = JavaThread::current(); 1861 ThreadBlockInVM tbivm(thread); 1862 1863 bool threadIsSuspended; 1864 do { 1865 thread->set_suspend_equivalent(); 1866 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1867 sig_sem->wait(); 1868 1869 // were we externally suspended while we were waiting? 1870 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1871 if (threadIsSuspended) { 1872 // The semaphore has been incremented, but while we were waiting 1873 // another thread suspended us. We don't want to continue running 1874 // while suspended because that would surprise the thread that 1875 // suspended us. 1876 sig_sem->signal(); 1877 1878 thread->java_suspend_self(); 1879 } 1880 } while (threadIsSuspended); 1881 } 1882 } 1883 1884 int os::signal_wait() { 1885 return check_pending_signals(); 1886 } 1887 1888 //////////////////////////////////////////////////////////////////////////////// 1889 // Virtual Memory 1890 1891 int os::vm_page_size() { 1892 // Seems redundant as all get out 1893 assert(os::Bsd::page_size() != -1, "must call os::init"); 1894 return os::Bsd::page_size(); 1895 } 1896 1897 // Solaris allocates memory by pages. 1898 int os::vm_allocation_granularity() { 1899 assert(os::Bsd::page_size() != -1, "must call os::init"); 1900 return os::Bsd::page_size(); 1901 } 1902 1903 // Rationale behind this function: 1904 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1905 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1906 // samples for JITted code. Here we create private executable mapping over the code cache 1907 // and then we can use standard (well, almost, as mapping can change) way to provide 1908 // info for the reporting script by storing timestamp and location of symbol 1909 void bsd_wrap_code(char* base, size_t size) { 1910 static volatile jint cnt = 0; 1911 1912 if (!UseOprofile) { 1913 return; 1914 } 1915 1916 char buf[PATH_MAX + 1]; 1917 int num = Atomic::add(&cnt, 1); 1918 1919 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1920 os::get_temp_directory(), os::current_process_id(), num); 1921 unlink(buf); 1922 1923 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1924 1925 if (fd != -1) { 1926 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1927 if (rv != (off_t)-1) { 1928 if (::write(fd, "", 1) == 1) { 1929 mmap(base, size, 1930 PROT_READ|PROT_WRITE|PROT_EXEC, 1931 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1932 } 1933 } 1934 ::close(fd); 1935 unlink(buf); 1936 } 1937 } 1938 1939 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 1940 int err) { 1941 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 1942 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 1943 os::errno_name(err), err); 1944 } 1945 1946 // NOTE: Bsd kernel does not really reserve the pages for us. 1947 // All it does is to check if there are enough free pages 1948 // left at the time of mmap(). This could be a potential 1949 // problem. 1950 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1951 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1952 #ifdef __OpenBSD__ 1953 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1954 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 1955 if (::mprotect(addr, size, prot) == 0) { 1956 return true; 1957 } 1958 #else 1959 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1960 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1961 if (res != (uintptr_t) MAP_FAILED) { 1962 return true; 1963 } 1964 #endif 1965 1966 // Warn about any commit errors we see in non-product builds just 1967 // in case mmap() doesn't work as described on the man page. 1968 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 1969 1970 return false; 1971 } 1972 1973 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 1974 bool exec) { 1975 // alignment_hint is ignored on this OS 1976 return pd_commit_memory(addr, size, exec); 1977 } 1978 1979 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 1980 const char* mesg) { 1981 assert(mesg != NULL, "mesg must be specified"); 1982 if (!pd_commit_memory(addr, size, exec)) { 1983 // add extra info in product mode for vm_exit_out_of_memory(): 1984 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 1985 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 1986 } 1987 } 1988 1989 void os::pd_commit_memory_or_exit(char* addr, size_t size, 1990 size_t alignment_hint, bool exec, 1991 const char* mesg) { 1992 // alignment_hint is ignored on this OS 1993 pd_commit_memory_or_exit(addr, size, exec, mesg); 1994 } 1995 1996 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1997 } 1998 1999 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2000 ::madvise(addr, bytes, MADV_DONTNEED); 2001 } 2002 2003 void os::numa_make_global(char *addr, size_t bytes) { 2004 } 2005 2006 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2007 } 2008 2009 bool os::numa_topology_changed() { return false; } 2010 2011 size_t os::numa_get_groups_num() { 2012 return 1; 2013 } 2014 2015 int os::numa_get_group_id() { 2016 return 0; 2017 } 2018 2019 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2020 if (size > 0) { 2021 ids[0] = 0; 2022 return 1; 2023 } 2024 return 0; 2025 } 2026 2027 int os::numa_get_group_id_for_address(const void* address) { 2028 return 0; 2029 } 2030 2031 bool os::get_page_info(char *start, page_info* info) { 2032 return false; 2033 } 2034 2035 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2036 return end; 2037 } 2038 2039 2040 bool os::pd_uncommit_memory(char* addr, size_t size) { 2041 #ifdef __OpenBSD__ 2042 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2043 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size)); 2044 return ::mprotect(addr, size, PROT_NONE) == 0; 2045 #else 2046 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2047 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2048 return res != (uintptr_t) MAP_FAILED; 2049 #endif 2050 } 2051 2052 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2053 return os::commit_memory(addr, size, !ExecMem); 2054 } 2055 2056 // If this is a growable mapping, remove the guard pages entirely by 2057 // munmap()ping them. If not, just call uncommit_memory(). 2058 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2059 return os::uncommit_memory(addr, size); 2060 } 2061 2062 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2063 // at 'requested_addr'. If there are existing memory mappings at the same 2064 // location, however, they will be overwritten. If 'fixed' is false, 2065 // 'requested_addr' is only treated as a hint, the return value may or 2066 // may not start from the requested address. Unlike Bsd mmap(), this 2067 // function returns NULL to indicate failure. 2068 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2069 char * addr; 2070 int flags; 2071 2072 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2073 if (fixed) { 2074 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2075 flags |= MAP_FIXED; 2076 } 2077 2078 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2079 // touch an uncommitted page. Otherwise, the read/write might 2080 // succeed if we have enough swap space to back the physical page. 2081 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2082 flags, -1, 0); 2083 2084 return addr == MAP_FAILED ? NULL : addr; 2085 } 2086 2087 static int anon_munmap(char * addr, size_t size) { 2088 return ::munmap(addr, size) == 0; 2089 } 2090 2091 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2092 size_t alignment_hint) { 2093 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2094 } 2095 2096 bool os::pd_release_memory(char* addr, size_t size) { 2097 return anon_munmap(addr, size); 2098 } 2099 2100 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2101 // Bsd wants the mprotect address argument to be page aligned. 2102 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2103 2104 // According to SUSv3, mprotect() should only be used with mappings 2105 // established by mmap(), and mmap() always maps whole pages. Unaligned 2106 // 'addr' likely indicates problem in the VM (e.g. trying to change 2107 // protection of malloc'ed or statically allocated memory). Check the 2108 // caller if you hit this assert. 2109 assert(addr == bottom, "sanity check"); 2110 2111 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2112 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot); 2113 return ::mprotect(bottom, size, prot) == 0; 2114 } 2115 2116 // Set protections specified 2117 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2118 bool is_committed) { 2119 unsigned int p = 0; 2120 switch (prot) { 2121 case MEM_PROT_NONE: p = PROT_NONE; break; 2122 case MEM_PROT_READ: p = PROT_READ; break; 2123 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2124 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2125 default: 2126 ShouldNotReachHere(); 2127 } 2128 // is_committed is unused. 2129 return bsd_mprotect(addr, bytes, p); 2130 } 2131 2132 bool os::guard_memory(char* addr, size_t size) { 2133 return bsd_mprotect(addr, size, PROT_NONE); 2134 } 2135 2136 bool os::unguard_memory(char* addr, size_t size) { 2137 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2138 } 2139 2140 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2141 return false; 2142 } 2143 2144 // Large page support 2145 2146 static size_t _large_page_size = 0; 2147 2148 void os::large_page_init() { 2149 } 2150 2151 2152 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2153 fatal("os::reserve_memory_special should not be called on BSD."); 2154 return NULL; 2155 } 2156 2157 bool os::pd_release_memory_special(char* base, size_t bytes) { 2158 fatal("os::release_memory_special should not be called on BSD."); 2159 return false; 2160 } 2161 2162 size_t os::large_page_size() { 2163 return _large_page_size; 2164 } 2165 2166 bool os::can_commit_large_page_memory() { 2167 // Does not matter, we do not support huge pages. 2168 return false; 2169 } 2170 2171 bool os::can_execute_large_page_memory() { 2172 // Does not matter, we do not support huge pages. 2173 return false; 2174 } 2175 2176 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2177 assert(file_desc >= 0, "file_desc is not valid"); 2178 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2179 if (result != NULL) { 2180 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2181 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2182 } 2183 } 2184 return result; 2185 } 2186 2187 // Reserve memory at an arbitrary address, only if that area is 2188 // available (and not reserved for something else). 2189 2190 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2191 // Assert only that the size is a multiple of the page size, since 2192 // that's all that mmap requires, and since that's all we really know 2193 // about at this low abstraction level. If we need higher alignment, 2194 // we can either pass an alignment to this method or verify alignment 2195 // in one of the methods further up the call chain. See bug 5044738. 2196 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2197 2198 // Repeatedly allocate blocks until the block is allocated at the 2199 // right spot. 2200 2201 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2202 // if kernel honors the hint then we can return immediately. 2203 char * addr = anon_mmap(requested_addr, bytes, false); 2204 if (addr == requested_addr) { 2205 return requested_addr; 2206 } 2207 2208 if (addr != NULL) { 2209 // mmap() is successful but it fails to reserve at the requested address 2210 anon_munmap(addr, bytes); 2211 } 2212 2213 return NULL; 2214 } 2215 2216 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2217 void os::infinite_sleep() { 2218 while (true) { // sleep forever ... 2219 ::sleep(100); // ... 100 seconds at a time 2220 } 2221 } 2222 2223 // Used to convert frequent JVM_Yield() to nops 2224 bool os::dont_yield() { 2225 return DontYieldALot; 2226 } 2227 2228 void os::naked_yield() { 2229 sched_yield(); 2230 } 2231 2232 //////////////////////////////////////////////////////////////////////////////// 2233 // thread priority support 2234 2235 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2236 // only supports dynamic priority, static priority must be zero. For real-time 2237 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2238 // However, for large multi-threaded applications, SCHED_RR is not only slower 2239 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2240 // of 5 runs - Sep 2005). 2241 // 2242 // The following code actually changes the niceness of kernel-thread/LWP. It 2243 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2244 // not the entire user process, and user level threads are 1:1 mapped to kernel 2245 // threads. It has always been the case, but could change in the future. For 2246 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2247 // It is only used when ThreadPriorityPolicy=1 and may require system level permission 2248 // (e.g., root privilege or CAP_SYS_NICE capability). 2249 2250 #if !defined(__APPLE__) 2251 int os::java_to_os_priority[CriticalPriority + 1] = { 2252 19, // 0 Entry should never be used 2253 2254 0, // 1 MinPriority 2255 3, // 2 2256 6, // 3 2257 2258 10, // 4 2259 15, // 5 NormPriority 2260 18, // 6 2261 2262 21, // 7 2263 25, // 8 2264 28, // 9 NearMaxPriority 2265 2266 31, // 10 MaxPriority 2267 2268 31 // 11 CriticalPriority 2269 }; 2270 #else 2271 // Using Mach high-level priority assignments 2272 int os::java_to_os_priority[CriticalPriority + 1] = { 2273 0, // 0 Entry should never be used (MINPRI_USER) 2274 2275 27, // 1 MinPriority 2276 28, // 2 2277 29, // 3 2278 2279 30, // 4 2280 31, // 5 NormPriority (BASEPRI_DEFAULT) 2281 32, // 6 2282 2283 33, // 7 2284 34, // 8 2285 35, // 9 NearMaxPriority 2286 2287 36, // 10 MaxPriority 2288 2289 36 // 11 CriticalPriority 2290 }; 2291 #endif 2292 2293 static int prio_init() { 2294 if (ThreadPriorityPolicy == 1) { 2295 if (geteuid() != 0) { 2296 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) { 2297 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \ 2298 "e.g., being the root user. If the necessary permission is not " \ 2299 "possessed, changes to priority will be silently ignored."); 2300 } 2301 } 2302 } 2303 if (UseCriticalJavaThreadPriority) { 2304 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2305 } 2306 return 0; 2307 } 2308 2309 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2310 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2311 2312 #ifdef __OpenBSD__ 2313 // OpenBSD pthread_setprio starves low priority threads 2314 return OS_OK; 2315 #elif defined(__FreeBSD__) 2316 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2317 return (ret == 0) ? OS_OK : OS_ERR; 2318 #elif defined(__APPLE__) || defined(__NetBSD__) 2319 struct sched_param sp; 2320 int policy; 2321 2322 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) { 2323 return OS_ERR; 2324 } 2325 2326 sp.sched_priority = newpri; 2327 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) { 2328 return OS_ERR; 2329 } 2330 2331 return OS_OK; 2332 #else 2333 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2334 return (ret == 0) ? OS_OK : OS_ERR; 2335 #endif 2336 } 2337 2338 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2339 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2340 *priority_ptr = java_to_os_priority[NormPriority]; 2341 return OS_OK; 2342 } 2343 2344 errno = 0; 2345 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2346 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2347 #elif defined(__APPLE__) || defined(__NetBSD__) 2348 int policy; 2349 struct sched_param sp; 2350 2351 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp); 2352 if (res != 0) { 2353 *priority_ptr = -1; 2354 return OS_ERR; 2355 } else { 2356 *priority_ptr = sp.sched_priority; 2357 return OS_OK; 2358 } 2359 #else 2360 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2361 #endif 2362 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2363 } 2364 2365 //////////////////////////////////////////////////////////////////////////////// 2366 // suspend/resume support 2367 2368 // The low-level signal-based suspend/resume support is a remnant from the 2369 // old VM-suspension that used to be for java-suspension, safepoints etc, 2370 // within hotspot. Currently used by JFR's OSThreadSampler 2371 // 2372 // The remaining code is greatly simplified from the more general suspension 2373 // code that used to be used. 2374 // 2375 // The protocol is quite simple: 2376 // - suspend: 2377 // - sends a signal to the target thread 2378 // - polls the suspend state of the osthread using a yield loop 2379 // - target thread signal handler (SR_handler) sets suspend state 2380 // and blocks in sigsuspend until continued 2381 // - resume: 2382 // - sets target osthread state to continue 2383 // - sends signal to end the sigsuspend loop in the SR_handler 2384 // 2385 // Note that the SR_lock plays no role in this suspend/resume protocol, 2386 // but is checked for NULL in SR_handler as a thread termination indicator. 2387 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2388 // 2389 // Note that resume_clear_context() and suspend_save_context() are needed 2390 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2391 // which in part is used by: 2392 // - Forte Analyzer: AsyncGetCallTrace() 2393 // - StackBanging: get_frame_at_stack_banging_point() 2394 2395 static void resume_clear_context(OSThread *osthread) { 2396 osthread->set_ucontext(NULL); 2397 osthread->set_siginfo(NULL); 2398 } 2399 2400 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2401 osthread->set_ucontext(context); 2402 osthread->set_siginfo(siginfo); 2403 } 2404 2405 // Handler function invoked when a thread's execution is suspended or 2406 // resumed. We have to be careful that only async-safe functions are 2407 // called here (Note: most pthread functions are not async safe and 2408 // should be avoided.) 2409 // 2410 // Note: sigwait() is a more natural fit than sigsuspend() from an 2411 // interface point of view, but sigwait() prevents the signal hander 2412 // from being run. libpthread would get very confused by not having 2413 // its signal handlers run and prevents sigwait()'s use with the 2414 // mutex granting granting signal. 2415 // 2416 // Currently only ever called on the VMThread or JavaThread 2417 // 2418 #ifdef __APPLE__ 2419 static OSXSemaphore sr_semaphore; 2420 #else 2421 static PosixSemaphore sr_semaphore; 2422 #endif 2423 2424 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2425 // Save and restore errno to avoid confusing native code with EINTR 2426 // after sigsuspend. 2427 int old_errno = errno; 2428 2429 Thread* thread = Thread::current_or_null_safe(); 2430 assert(thread != NULL, "Missing current thread in SR_handler"); 2431 2432 // On some systems we have seen signal delivery get "stuck" until the signal 2433 // mask is changed as part of thread termination. Check that the current thread 2434 // has not already terminated (via SR_lock()) - else the following assertion 2435 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2436 // destructor has completed. 2437 2438 if (thread->SR_lock() == NULL) { 2439 return; 2440 } 2441 2442 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2443 2444 OSThread* osthread = thread->osthread(); 2445 2446 os::SuspendResume::State current = osthread->sr.state(); 2447 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2448 suspend_save_context(osthread, siginfo, context); 2449 2450 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2451 os::SuspendResume::State state = osthread->sr.suspended(); 2452 if (state == os::SuspendResume::SR_SUSPENDED) { 2453 sigset_t suspend_set; // signals for sigsuspend() 2454 2455 // get current set of blocked signals and unblock resume signal 2456 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2457 sigdelset(&suspend_set, SR_signum); 2458 2459 sr_semaphore.signal(); 2460 // wait here until we are resumed 2461 while (1) { 2462 sigsuspend(&suspend_set); 2463 2464 os::SuspendResume::State result = osthread->sr.running(); 2465 if (result == os::SuspendResume::SR_RUNNING) { 2466 sr_semaphore.signal(); 2467 break; 2468 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2469 ShouldNotReachHere(); 2470 } 2471 } 2472 2473 } else if (state == os::SuspendResume::SR_RUNNING) { 2474 // request was cancelled, continue 2475 } else { 2476 ShouldNotReachHere(); 2477 } 2478 2479 resume_clear_context(osthread); 2480 } else if (current == os::SuspendResume::SR_RUNNING) { 2481 // request was cancelled, continue 2482 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2483 // ignore 2484 } else { 2485 // ignore 2486 } 2487 2488 errno = old_errno; 2489 } 2490 2491 2492 static int SR_initialize() { 2493 struct sigaction act; 2494 char *s; 2495 // Get signal number to use for suspend/resume 2496 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2497 int sig = ::strtol(s, 0, 10); 2498 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2499 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2500 SR_signum = sig; 2501 } else { 2502 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2503 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2504 } 2505 } 2506 2507 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2508 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2509 2510 sigemptyset(&SR_sigset); 2511 sigaddset(&SR_sigset, SR_signum); 2512 2513 // Set up signal handler for suspend/resume 2514 act.sa_flags = SA_RESTART|SA_SIGINFO; 2515 act.sa_handler = (void (*)(int)) SR_handler; 2516 2517 // SR_signum is blocked by default. 2518 // 4528190 - We also need to block pthread restart signal (32 on all 2519 // supported Bsd platforms). Note that BsdThreads need to block 2520 // this signal for all threads to work properly. So we don't have 2521 // to use hard-coded signal number when setting up the mask. 2522 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2523 2524 if (sigaction(SR_signum, &act, 0) == -1) { 2525 return -1; 2526 } 2527 2528 // Save signal flag 2529 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2530 return 0; 2531 } 2532 2533 static int sr_notify(OSThread* osthread) { 2534 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2535 assert_status(status == 0, status, "pthread_kill"); 2536 return status; 2537 } 2538 2539 // "Randomly" selected value for how long we want to spin 2540 // before bailing out on suspending a thread, also how often 2541 // we send a signal to a thread we want to resume 2542 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2543 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2544 2545 // returns true on success and false on error - really an error is fatal 2546 // but this seems the normal response to library errors 2547 static bool do_suspend(OSThread* osthread) { 2548 assert(osthread->sr.is_running(), "thread should be running"); 2549 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2550 2551 // mark as suspended and send signal 2552 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2553 // failed to switch, state wasn't running? 2554 ShouldNotReachHere(); 2555 return false; 2556 } 2557 2558 if (sr_notify(osthread) != 0) { 2559 ShouldNotReachHere(); 2560 } 2561 2562 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2563 while (true) { 2564 if (sr_semaphore.timedwait(2)) { 2565 break; 2566 } else { 2567 // timeout 2568 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2569 if (cancelled == os::SuspendResume::SR_RUNNING) { 2570 return false; 2571 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2572 // make sure that we consume the signal on the semaphore as well 2573 sr_semaphore.wait(); 2574 break; 2575 } else { 2576 ShouldNotReachHere(); 2577 return false; 2578 } 2579 } 2580 } 2581 2582 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2583 return true; 2584 } 2585 2586 static void do_resume(OSThread* osthread) { 2587 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2588 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2589 2590 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2591 // failed to switch to WAKEUP_REQUEST 2592 ShouldNotReachHere(); 2593 return; 2594 } 2595 2596 while (true) { 2597 if (sr_notify(osthread) == 0) { 2598 if (sr_semaphore.timedwait(2)) { 2599 if (osthread->sr.is_running()) { 2600 return; 2601 } 2602 } 2603 } else { 2604 ShouldNotReachHere(); 2605 } 2606 } 2607 2608 guarantee(osthread->sr.is_running(), "Must be running!"); 2609 } 2610 2611 /////////////////////////////////////////////////////////////////////////////////// 2612 // signal handling (except suspend/resume) 2613 2614 // This routine may be used by user applications as a "hook" to catch signals. 2615 // The user-defined signal handler must pass unrecognized signals to this 2616 // routine, and if it returns true (non-zero), then the signal handler must 2617 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2618 // routine will never retun false (zero), but instead will execute a VM panic 2619 // routine kill the process. 2620 // 2621 // If this routine returns false, it is OK to call it again. This allows 2622 // the user-defined signal handler to perform checks either before or after 2623 // the VM performs its own checks. Naturally, the user code would be making 2624 // a serious error if it tried to handle an exception (such as a null check 2625 // or breakpoint) that the VM was generating for its own correct operation. 2626 // 2627 // This routine may recognize any of the following kinds of signals: 2628 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2629 // It should be consulted by handlers for any of those signals. 2630 // 2631 // The caller of this routine must pass in the three arguments supplied 2632 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2633 // field of the structure passed to sigaction(). This routine assumes that 2634 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2635 // 2636 // Note that the VM will print warnings if it detects conflicting signal 2637 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2638 // 2639 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2640 void* ucontext, 2641 int abort_if_unrecognized); 2642 2643 static void signalHandler(int sig, siginfo_t* info, void* uc) { 2644 assert(info != NULL && uc != NULL, "it must be old kernel"); 2645 int orig_errno = errno; // Preserve errno value over signal handler. 2646 JVM_handle_bsd_signal(sig, info, uc, true); 2647 errno = orig_errno; 2648 } 2649 2650 2651 // This boolean allows users to forward their own non-matching signals 2652 // to JVM_handle_bsd_signal, harmlessly. 2653 bool os::Bsd::signal_handlers_are_installed = false; 2654 2655 // For signal-chaining 2656 bool os::Bsd::libjsig_is_loaded = false; 2657 typedef struct sigaction *(*get_signal_t)(int); 2658 get_signal_t os::Bsd::get_signal_action = NULL; 2659 2660 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2661 struct sigaction *actp = NULL; 2662 2663 if (libjsig_is_loaded) { 2664 // Retrieve the old signal handler from libjsig 2665 actp = (*get_signal_action)(sig); 2666 } 2667 if (actp == NULL) { 2668 // Retrieve the preinstalled signal handler from jvm 2669 actp = os::Posix::get_preinstalled_handler(sig); 2670 } 2671 2672 return actp; 2673 } 2674 2675 static bool call_chained_handler(struct sigaction *actp, int sig, 2676 siginfo_t *siginfo, void *context) { 2677 // Call the old signal handler 2678 if (actp->sa_handler == SIG_DFL) { 2679 // It's more reasonable to let jvm treat it as an unexpected exception 2680 // instead of taking the default action. 2681 return false; 2682 } else if (actp->sa_handler != SIG_IGN) { 2683 if ((actp->sa_flags & SA_NODEFER) == 0) { 2684 // automaticlly block the signal 2685 sigaddset(&(actp->sa_mask), sig); 2686 } 2687 2688 sa_handler_t hand; 2689 sa_sigaction_t sa; 2690 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2691 // retrieve the chained handler 2692 if (siginfo_flag_set) { 2693 sa = actp->sa_sigaction; 2694 } else { 2695 hand = actp->sa_handler; 2696 } 2697 2698 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2699 actp->sa_handler = SIG_DFL; 2700 } 2701 2702 // try to honor the signal mask 2703 sigset_t oset; 2704 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2705 2706 // call into the chained handler 2707 if (siginfo_flag_set) { 2708 (*sa)(sig, siginfo, context); 2709 } else { 2710 (*hand)(sig); 2711 } 2712 2713 // restore the signal mask 2714 pthread_sigmask(SIG_SETMASK, &oset, 0); 2715 } 2716 // Tell jvm's signal handler the signal is taken care of. 2717 return true; 2718 } 2719 2720 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2721 bool chained = false; 2722 // signal-chaining 2723 if (UseSignalChaining) { 2724 struct sigaction *actp = get_chained_signal_action(sig); 2725 if (actp != NULL) { 2726 chained = call_chained_handler(actp, sig, siginfo, context); 2727 } 2728 } 2729 return chained; 2730 } 2731 2732 // for diagnostic 2733 int sigflags[NSIG]; 2734 2735 int os::Bsd::get_our_sigflags(int sig) { 2736 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2737 return sigflags[sig]; 2738 } 2739 2740 void os::Bsd::set_our_sigflags(int sig, int flags) { 2741 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2742 if (sig > 0 && sig < NSIG) { 2743 sigflags[sig] = flags; 2744 } 2745 } 2746 2747 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2748 // Check for overwrite. 2749 struct sigaction oldAct; 2750 sigaction(sig, (struct sigaction*)NULL, &oldAct); 2751 2752 void* oldhand = oldAct.sa_sigaction 2753 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2754 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2755 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 2756 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 2757 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 2758 if (AllowUserSignalHandlers || !set_installed) { 2759 // Do not overwrite; user takes responsibility to forward to us. 2760 return; 2761 } else if (UseSignalChaining) { 2762 // save the old handler in jvm 2763 os::Posix::save_preinstalled_handler(sig, oldAct); 2764 // libjsig also interposes the sigaction() call below and saves the 2765 // old sigaction on it own. 2766 } else { 2767 fatal("Encountered unexpected pre-existing sigaction handler " 2768 "%#lx for signal %d.", (long)oldhand, sig); 2769 } 2770 } 2771 2772 struct sigaction sigAct; 2773 sigfillset(&(sigAct.sa_mask)); 2774 sigAct.sa_handler = SIG_DFL; 2775 if (!set_installed) { 2776 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2777 } else { 2778 sigAct.sa_sigaction = signalHandler; 2779 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2780 } 2781 #ifdef __APPLE__ 2782 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 2783 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 2784 // if the signal handler declares it will handle it on alternate stack. 2785 // Notice we only declare we will handle it on alt stack, but we are not 2786 // actually going to use real alt stack - this is just a workaround. 2787 // Please see ux_exception.c, method catch_mach_exception_raise for details 2788 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 2789 if (sig == SIGSEGV) { 2790 sigAct.sa_flags |= SA_ONSTACK; 2791 } 2792 #endif 2793 2794 // Save flags, which are set by ours 2795 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2796 sigflags[sig] = sigAct.sa_flags; 2797 2798 int ret = sigaction(sig, &sigAct, &oldAct); 2799 assert(ret == 0, "check"); 2800 2801 void* oldhand2 = oldAct.sa_sigaction 2802 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2803 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2804 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 2805 } 2806 2807 // install signal handlers for signals that HotSpot needs to 2808 // handle in order to support Java-level exception handling. 2809 2810 void os::Bsd::install_signal_handlers() { 2811 if (!signal_handlers_are_installed) { 2812 signal_handlers_are_installed = true; 2813 2814 // signal-chaining 2815 typedef void (*signal_setting_t)(); 2816 signal_setting_t begin_signal_setting = NULL; 2817 signal_setting_t end_signal_setting = NULL; 2818 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2819 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 2820 if (begin_signal_setting != NULL) { 2821 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2822 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 2823 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 2824 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 2825 libjsig_is_loaded = true; 2826 assert(UseSignalChaining, "should enable signal-chaining"); 2827 } 2828 if (libjsig_is_loaded) { 2829 // Tell libjsig jvm is setting signal handlers 2830 (*begin_signal_setting)(); 2831 } 2832 2833 set_signal_handler(SIGSEGV, true); 2834 set_signal_handler(SIGPIPE, true); 2835 set_signal_handler(SIGBUS, true); 2836 set_signal_handler(SIGILL, true); 2837 set_signal_handler(SIGFPE, true); 2838 set_signal_handler(SIGXFSZ, true); 2839 2840 #if defined(__APPLE__) 2841 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 2842 // signals caught and handled by the JVM. To work around this, we reset the mach task 2843 // signal handler that's placed on our process by CrashReporter. This disables 2844 // CrashReporter-based reporting. 2845 // 2846 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 2847 // on caught fatal signals. 2848 // 2849 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 2850 // handlers. By replacing the existing task exception handler, we disable gdb's mach 2851 // exception handling, while leaving the standard BSD signal handlers functional. 2852 kern_return_t kr; 2853 kr = task_set_exception_ports(mach_task_self(), 2854 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 2855 MACH_PORT_NULL, 2856 EXCEPTION_STATE_IDENTITY, 2857 MACHINE_THREAD_STATE); 2858 2859 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 2860 #endif 2861 2862 if (libjsig_is_loaded) { 2863 // Tell libjsig jvm finishes setting signal handlers 2864 (*end_signal_setting)(); 2865 } 2866 2867 // We don't activate signal checker if libjsig is in place, we trust ourselves 2868 // and if UserSignalHandler is installed all bets are off 2869 if (CheckJNICalls) { 2870 if (libjsig_is_loaded) { 2871 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); 2872 check_signals = false; 2873 } 2874 if (AllowUserSignalHandlers) { 2875 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 2876 check_signals = false; 2877 } 2878 } 2879 } 2880 } 2881 2882 2883 ///// 2884 // glibc on Bsd platform uses non-documented flag 2885 // to indicate, that some special sort of signal 2886 // trampoline is used. 2887 // We will never set this flag, and we should 2888 // ignore this flag in our diagnostic 2889 #ifdef SIGNIFICANT_SIGNAL_MASK 2890 #undef SIGNIFICANT_SIGNAL_MASK 2891 #endif 2892 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 2893 2894 static const char* get_signal_handler_name(address handler, 2895 char* buf, int buflen) { 2896 int offset; 2897 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2898 if (found) { 2899 // skip directory names 2900 const char *p1, *p2; 2901 p1 = buf; 2902 size_t len = strlen(os::file_separator()); 2903 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2904 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2905 } else { 2906 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2907 } 2908 return buf; 2909 } 2910 2911 static void print_signal_handler(outputStream* st, int sig, 2912 char* buf, size_t buflen) { 2913 struct sigaction sa; 2914 2915 sigaction(sig, NULL, &sa); 2916 2917 // See comment for SIGNIFICANT_SIGNAL_MASK define 2918 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 2919 2920 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2921 2922 address handler = (sa.sa_flags & SA_SIGINFO) 2923 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2924 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2925 2926 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2927 st->print("SIG_DFL"); 2928 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2929 st->print("SIG_IGN"); 2930 } else { 2931 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2932 } 2933 2934 st->print(", sa_mask[0]="); 2935 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2936 2937 address rh = VMError::get_resetted_sighandler(sig); 2938 // May be, handler was resetted by VMError? 2939 if (rh != NULL) { 2940 handler = rh; 2941 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 2942 } 2943 2944 st->print(", sa_flags="); 2945 os::Posix::print_sa_flags(st, sa.sa_flags); 2946 2947 // Check: is it our handler? 2948 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 2949 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 2950 // It is our signal handler 2951 // check for flags, reset system-used one! 2952 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 2953 st->print( 2954 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2955 os::Bsd::get_our_sigflags(sig)); 2956 } 2957 } 2958 st->cr(); 2959 } 2960 2961 2962 #define DO_SIGNAL_CHECK(sig) \ 2963 do { \ 2964 if (!sigismember(&check_signal_done, sig)) { \ 2965 os::Bsd::check_signal_handler(sig); \ 2966 } \ 2967 } while (0) 2968 2969 // This method is a periodic task to check for misbehaving JNI applications 2970 // under CheckJNI, we can add any periodic checks here 2971 2972 void os::run_periodic_checks() { 2973 2974 if (check_signals == false) return; 2975 2976 // SEGV and BUS if overridden could potentially prevent 2977 // generation of hs*.log in the event of a crash, debugging 2978 // such a case can be very challenging, so we absolutely 2979 // check the following for a good measure: 2980 DO_SIGNAL_CHECK(SIGSEGV); 2981 DO_SIGNAL_CHECK(SIGILL); 2982 DO_SIGNAL_CHECK(SIGFPE); 2983 DO_SIGNAL_CHECK(SIGBUS); 2984 DO_SIGNAL_CHECK(SIGPIPE); 2985 DO_SIGNAL_CHECK(SIGXFSZ); 2986 2987 2988 // ReduceSignalUsage allows the user to override these handlers 2989 // see comments at the very top and jvm_md.h 2990 if (!ReduceSignalUsage) { 2991 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 2992 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 2993 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 2994 DO_SIGNAL_CHECK(BREAK_SIGNAL); 2995 } 2996 2997 DO_SIGNAL_CHECK(SR_signum); 2998 } 2999 3000 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3001 3002 static os_sigaction_t os_sigaction = NULL; 3003 3004 void os::Bsd::check_signal_handler(int sig) { 3005 char buf[O_BUFLEN]; 3006 address jvmHandler = NULL; 3007 3008 3009 struct sigaction act; 3010 if (os_sigaction == NULL) { 3011 // only trust the default sigaction, in case it has been interposed 3012 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3013 if (os_sigaction == NULL) return; 3014 } 3015 3016 os_sigaction(sig, (struct sigaction*)NULL, &act); 3017 3018 3019 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3020 3021 address thisHandler = (act.sa_flags & SA_SIGINFO) 3022 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3023 : CAST_FROM_FN_PTR(address, act.sa_handler); 3024 3025 3026 switch (sig) { 3027 case SIGSEGV: 3028 case SIGBUS: 3029 case SIGFPE: 3030 case SIGPIPE: 3031 case SIGILL: 3032 case SIGXFSZ: 3033 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3034 break; 3035 3036 case SHUTDOWN1_SIGNAL: 3037 case SHUTDOWN2_SIGNAL: 3038 case SHUTDOWN3_SIGNAL: 3039 case BREAK_SIGNAL: 3040 jvmHandler = (address)user_handler(); 3041 break; 3042 3043 default: 3044 if (sig == SR_signum) { 3045 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3046 } else { 3047 return; 3048 } 3049 break; 3050 } 3051 3052 if (thisHandler != jvmHandler) { 3053 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3054 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3055 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3056 // No need to check this sig any longer 3057 sigaddset(&check_signal_done, sig); 3058 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3059 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3060 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3061 exception_name(sig, buf, O_BUFLEN)); 3062 } 3063 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3064 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3065 tty->print("expected:"); 3066 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3067 tty->cr(); 3068 tty->print(" found:"); 3069 os::Posix::print_sa_flags(tty, act.sa_flags); 3070 tty->cr(); 3071 // No need to check this sig any longer 3072 sigaddset(&check_signal_done, sig); 3073 } 3074 3075 // Dump all the signal 3076 if (sigismember(&check_signal_done, sig)) { 3077 print_signal_handlers(tty, buf, O_BUFLEN); 3078 } 3079 } 3080 3081 extern void report_error(char* file_name, int line_no, char* title, 3082 char* format, ...); 3083 3084 // this is called _before_ the most of global arguments have been parsed 3085 void os::init(void) { 3086 char dummy; // used to get a guess on initial stack address 3087 3088 clock_tics_per_sec = CLK_TCK; 3089 3090 init_random(1234567); 3091 3092 Bsd::set_page_size(getpagesize()); 3093 if (Bsd::page_size() == -1) { 3094 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3095 } 3096 init_page_sizes((size_t) Bsd::page_size()); 3097 3098 Bsd::initialize_system_info(); 3099 3100 // _main_thread points to the thread that created/loaded the JVM. 3101 Bsd::_main_thread = pthread_self(); 3102 3103 Bsd::clock_init(); 3104 initial_time_count = javaTimeNanos(); 3105 3106 os::Posix::init(); 3107 } 3108 3109 // To install functions for atexit system call 3110 extern "C" { 3111 static void perfMemory_exit_helper() { 3112 perfMemory_exit(); 3113 } 3114 } 3115 3116 // this is called _after_ the global arguments have been parsed 3117 jint os::init_2(void) { 3118 3119 // This could be set after os::Posix::init() but all platforms 3120 // have to set it the same so we have to mirror Solaris. 3121 DEBUG_ONLY(os::set_mutex_init_done();) 3122 3123 os::Posix::init_2(); 3124 3125 // initialize suspend/resume support - must do this before signal_sets_init() 3126 if (SR_initialize() != 0) { 3127 perror("SR_initialize failed"); 3128 return JNI_ERR; 3129 } 3130 3131 Bsd::signal_sets_init(); 3132 Bsd::install_signal_handlers(); 3133 // Initialize data for jdk.internal.misc.Signal 3134 if (!ReduceSignalUsage) { 3135 jdk_misc_signal_init(); 3136 } 3137 3138 // Check and sets minimum stack sizes against command line options 3139 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3140 return JNI_ERR; 3141 } 3142 3143 if (MaxFDLimit) { 3144 // set the number of file descriptors to max. print out error 3145 // if getrlimit/setrlimit fails but continue regardless. 3146 struct rlimit nbr_files; 3147 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3148 if (status != 0) { 3149 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3150 } else { 3151 nbr_files.rlim_cur = nbr_files.rlim_max; 3152 3153 #ifdef __APPLE__ 3154 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3155 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3156 // be used instead 3157 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3158 #endif 3159 3160 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3161 if (status != 0) { 3162 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3163 } 3164 } 3165 } 3166 3167 // at-exit methods are called in the reverse order of their registration. 3168 // atexit functions are called on return from main or as a result of a 3169 // call to exit(3C). There can be only 32 of these functions registered 3170 // and atexit() does not set errno. 3171 3172 if (PerfAllowAtExitRegistration) { 3173 // only register atexit functions if PerfAllowAtExitRegistration is set. 3174 // atexit functions can be delayed until process exit time, which 3175 // can be problematic for embedded VM situations. Embedded VMs should 3176 // call DestroyJavaVM() to assure that VM resources are released. 3177 3178 // note: perfMemory_exit_helper atexit function may be removed in 3179 // the future if the appropriate cleanup code can be added to the 3180 // VM_Exit VMOperation's doit method. 3181 if (atexit(perfMemory_exit_helper) != 0) { 3182 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3183 } 3184 } 3185 3186 // initialize thread priority policy 3187 prio_init(); 3188 3189 #ifdef __APPLE__ 3190 // dynamically link to objective c gc registration 3191 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3192 if (handleLibObjc != NULL) { 3193 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3194 } 3195 #endif 3196 3197 return JNI_OK; 3198 } 3199 3200 int os::active_processor_count() { 3201 // User has overridden the number of active processors 3202 if (ActiveProcessorCount > 0) { 3203 log_trace(os)("active_processor_count: " 3204 "active processor count set by user : %d", 3205 ActiveProcessorCount); 3206 return ActiveProcessorCount; 3207 } 3208 3209 return _processor_count; 3210 } 3211 3212 #ifdef __APPLE__ 3213 uint os::processor_id() { 3214 // Get the initial APIC id and return the associated processor id. The initial APIC 3215 // id is limited to 8-bits, which means we can have at most 256 unique APIC ids. If 3216 // the system has more processors (or the initial APIC ids are discontiguous) the 3217 // APIC id will be truncated and more than one processor will potentially share the 3218 // same processor id. This is not optimal, but unlikely to happen in practice. Should 3219 // this become a real problem we could switch to using x2APIC ids, which are 32-bit 3220 // wide. However, note that x2APIC is Intel-specific, and the wider number space 3221 // would require a more complicated mapping approach. 3222 uint eax = 0x1; 3223 uint ebx; 3224 uint ecx = 0; 3225 uint edx; 3226 3227 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : ); 3228 3229 uint apic_id = (ebx >> 24) & (processor_id_map_size - 1); 3230 int processor_id = Atomic::load(&processor_id_map[apic_id]); 3231 3232 while (processor_id < 0) { 3233 // Assign processor id to APIC id 3234 processor_id = Atomic::cmpxchg(&processor_id_map[apic_id], processor_id_unassigned, processor_id_assigning); 3235 if (processor_id == processor_id_unassigned) { 3236 processor_id = Atomic::fetch_and_add(&processor_id_next, 1) % os::processor_count(); 3237 Atomic::store(&processor_id_map[apic_id], processor_id); 3238 } 3239 } 3240 3241 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id"); 3242 3243 return (uint)processor_id; 3244 } 3245 #endif 3246 3247 void os::set_native_thread_name(const char *name) { 3248 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3249 // This is only supported in Snow Leopard and beyond 3250 if (name != NULL) { 3251 // Add a "Java: " prefix to the name 3252 char buf[MAXTHREADNAMESIZE]; 3253 snprintf(buf, sizeof(buf), "Java: %s", name); 3254 pthread_setname_np(buf); 3255 } 3256 #endif 3257 } 3258 3259 bool os::bind_to_processor(uint processor_id) { 3260 // Not yet implemented. 3261 return false; 3262 } 3263 3264 void os::SuspendedThreadTask::internal_do_task() { 3265 if (do_suspend(_thread->osthread())) { 3266 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3267 do_task(context); 3268 do_resume(_thread->osthread()); 3269 } 3270 } 3271 3272 //////////////////////////////////////////////////////////////////////////////// 3273 // debug support 3274 3275 bool os::find(address addr, outputStream* st) { 3276 Dl_info dlinfo; 3277 memset(&dlinfo, 0, sizeof(dlinfo)); 3278 if (dladdr(addr, &dlinfo) != 0) { 3279 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3280 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3281 st->print("%s+%#x", dlinfo.dli_sname, 3282 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3283 } else if (dlinfo.dli_fbase != NULL) { 3284 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3285 } else { 3286 st->print("<absolute address>"); 3287 } 3288 if (dlinfo.dli_fname != NULL) { 3289 st->print(" in %s", dlinfo.dli_fname); 3290 } 3291 if (dlinfo.dli_fbase != NULL) { 3292 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3293 } 3294 st->cr(); 3295 3296 if (Verbose) { 3297 // decode some bytes around the PC 3298 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3299 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3300 address lowest = (address) dlinfo.dli_sname; 3301 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3302 if (begin < lowest) begin = lowest; 3303 Dl_info dlinfo2; 3304 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3305 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3306 end = (address) dlinfo2.dli_saddr; 3307 } 3308 Disassembler::decode(begin, end, st); 3309 } 3310 return true; 3311 } 3312 return false; 3313 } 3314 3315 //////////////////////////////////////////////////////////////////////////////// 3316 // misc 3317 3318 // This does not do anything on Bsd. This is basically a hook for being 3319 // able to use structured exception handling (thread-local exception filters) 3320 // on, e.g., Win32. 3321 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3322 const methodHandle& method, JavaCallArguments* args, 3323 Thread* thread) { 3324 f(value, method, args, thread); 3325 } 3326 3327 void os::print_statistics() { 3328 } 3329 3330 bool os::message_box(const char* title, const char* message) { 3331 int i; 3332 fdStream err(defaultStream::error_fd()); 3333 for (i = 0; i < 78; i++) err.print_raw("="); 3334 err.cr(); 3335 err.print_raw_cr(title); 3336 for (i = 0; i < 78; i++) err.print_raw("-"); 3337 err.cr(); 3338 err.print_raw_cr(message); 3339 for (i = 0; i < 78; i++) err.print_raw("="); 3340 err.cr(); 3341 3342 char buf[16]; 3343 // Prevent process from exiting upon "read error" without consuming all CPU 3344 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3345 3346 return buf[0] == 'y' || buf[0] == 'Y'; 3347 } 3348 3349 static inline struct timespec get_mtime(const char* filename) { 3350 struct stat st; 3351 int ret = os::stat(filename, &st); 3352 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 3353 #ifdef __APPLE__ 3354 return st.st_mtimespec; 3355 #else 3356 return st.st_mtim; 3357 #endif 3358 } 3359 3360 int os::compare_file_modified_times(const char* file1, const char* file2) { 3361 struct timespec filetime1 = get_mtime(file1); 3362 struct timespec filetime2 = get_mtime(file2); 3363 int diff = filetime1.tv_sec - filetime2.tv_sec; 3364 if (diff == 0) { 3365 return filetime1.tv_nsec - filetime2.tv_nsec; 3366 } 3367 return diff; 3368 } 3369 3370 // Is a (classpath) directory empty? 3371 bool os::dir_is_empty(const char* path) { 3372 DIR *dir = NULL; 3373 struct dirent *ptr; 3374 3375 dir = opendir(path); 3376 if (dir == NULL) return true; 3377 3378 // Scan the directory 3379 bool result = true; 3380 while (result && (ptr = readdir(dir)) != NULL) { 3381 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3382 result = false; 3383 } 3384 } 3385 closedir(dir); 3386 return result; 3387 } 3388 3389 // This code originates from JDK's sysOpen and open64_w 3390 // from src/solaris/hpi/src/system_md.c 3391 3392 int os::open(const char *path, int oflag, int mode) { 3393 if (strlen(path) > MAX_PATH - 1) { 3394 errno = ENAMETOOLONG; 3395 return -1; 3396 } 3397 int fd; 3398 3399 fd = ::open(path, oflag, mode); 3400 if (fd == -1) return -1; 3401 3402 // If the open succeeded, the file might still be a directory 3403 { 3404 struct stat buf; 3405 int ret = ::fstat(fd, &buf); 3406 int st_mode = buf.st_mode; 3407 3408 if (ret != -1) { 3409 if ((st_mode & S_IFMT) == S_IFDIR) { 3410 errno = EISDIR; 3411 ::close(fd); 3412 return -1; 3413 } 3414 } else { 3415 ::close(fd); 3416 return -1; 3417 } 3418 } 3419 3420 // All file descriptors that are opened in the JVM and not 3421 // specifically destined for a subprocess should have the 3422 // close-on-exec flag set. If we don't set it, then careless 3rd 3423 // party native code might fork and exec without closing all 3424 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3425 // UNIXProcess.c), and this in turn might: 3426 // 3427 // - cause end-of-file to fail to be detected on some file 3428 // descriptors, resulting in mysterious hangs, or 3429 // 3430 // - might cause an fopen in the subprocess to fail on a system 3431 // suffering from bug 1085341. 3432 // 3433 // (Yes, the default setting of the close-on-exec flag is a Unix 3434 // design flaw) 3435 // 3436 // See: 3437 // 1085341: 32-bit stdio routines should support file descriptors >255 3438 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3439 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3440 // 3441 #ifdef FD_CLOEXEC 3442 { 3443 int flags = ::fcntl(fd, F_GETFD); 3444 if (flags != -1) { 3445 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3446 } 3447 } 3448 #endif 3449 3450 return fd; 3451 } 3452 3453 3454 // create binary file, rewriting existing file if required 3455 int os::create_binary_file(const char* path, bool rewrite_existing) { 3456 int oflags = O_WRONLY | O_CREAT; 3457 if (!rewrite_existing) { 3458 oflags |= O_EXCL; 3459 } 3460 return ::open(path, oflags, S_IREAD | S_IWRITE); 3461 } 3462 3463 // return current position of file pointer 3464 jlong os::current_file_offset(int fd) { 3465 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3466 } 3467 3468 // move file pointer to the specified offset 3469 jlong os::seek_to_file_offset(int fd, jlong offset) { 3470 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3471 } 3472 3473 // This code originates from JDK's sysAvailable 3474 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3475 3476 int os::available(int fd, jlong *bytes) { 3477 jlong cur, end; 3478 int mode; 3479 struct stat buf; 3480 3481 if (::fstat(fd, &buf) >= 0) { 3482 mode = buf.st_mode; 3483 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3484 int n; 3485 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3486 *bytes = n; 3487 return 1; 3488 } 3489 } 3490 } 3491 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3492 return 0; 3493 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3494 return 0; 3495 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3496 return 0; 3497 } 3498 *bytes = end - cur; 3499 return 1; 3500 } 3501 3502 // Map a block of memory. 3503 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3504 char *addr, size_t bytes, bool read_only, 3505 bool allow_exec) { 3506 int prot; 3507 int flags; 3508 3509 if (read_only) { 3510 prot = PROT_READ; 3511 flags = MAP_SHARED; 3512 } else { 3513 prot = PROT_READ | PROT_WRITE; 3514 flags = MAP_PRIVATE; 3515 } 3516 3517 if (allow_exec) { 3518 prot |= PROT_EXEC; 3519 } 3520 3521 if (addr != NULL) { 3522 flags |= MAP_FIXED; 3523 } 3524 3525 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3526 fd, file_offset); 3527 if (mapped_address == MAP_FAILED) { 3528 return NULL; 3529 } 3530 return mapped_address; 3531 } 3532 3533 3534 // Remap a block of memory. 3535 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3536 char *addr, size_t bytes, bool read_only, 3537 bool allow_exec) { 3538 // same as map_memory() on this OS 3539 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3540 allow_exec); 3541 } 3542 3543 3544 // Unmap a block of memory. 3545 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3546 return munmap(addr, bytes) == 0; 3547 } 3548 3549 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3550 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3551 // of a thread. 3552 // 3553 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3554 // the fast estimate available on the platform. 3555 3556 jlong os::current_thread_cpu_time() { 3557 #ifdef __APPLE__ 3558 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3559 #else 3560 Unimplemented(); 3561 return 0; 3562 #endif 3563 } 3564 3565 jlong os::thread_cpu_time(Thread* thread) { 3566 #ifdef __APPLE__ 3567 return os::thread_cpu_time(thread, true /* user + sys */); 3568 #else 3569 Unimplemented(); 3570 return 0; 3571 #endif 3572 } 3573 3574 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3575 #ifdef __APPLE__ 3576 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3577 #else 3578 Unimplemented(); 3579 return 0; 3580 #endif 3581 } 3582 3583 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3584 #ifdef __APPLE__ 3585 struct thread_basic_info tinfo; 3586 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3587 kern_return_t kr; 3588 thread_t mach_thread; 3589 3590 mach_thread = thread->osthread()->thread_id(); 3591 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3592 if (kr != KERN_SUCCESS) { 3593 return -1; 3594 } 3595 3596 if (user_sys_cpu_time) { 3597 jlong nanos; 3598 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3599 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3600 return nanos; 3601 } else { 3602 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3603 } 3604 #else 3605 Unimplemented(); 3606 return 0; 3607 #endif 3608 } 3609 3610 3611 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3612 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3613 info_ptr->may_skip_backward = false; // elapsed time not wall time 3614 info_ptr->may_skip_forward = false; // elapsed time not wall time 3615 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3616 } 3617 3618 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3619 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3620 info_ptr->may_skip_backward = false; // elapsed time not wall time 3621 info_ptr->may_skip_forward = false; // elapsed time not wall time 3622 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3623 } 3624 3625 bool os::is_thread_cpu_time_supported() { 3626 #ifdef __APPLE__ 3627 return true; 3628 #else 3629 return false; 3630 #endif 3631 } 3632 3633 // System loadavg support. Returns -1 if load average cannot be obtained. 3634 // Bsd doesn't yet have a (official) notion of processor sets, 3635 // so just return the system wide load average. 3636 int os::loadavg(double loadavg[], int nelem) { 3637 return ::getloadavg(loadavg, nelem); 3638 } 3639 3640 void os::pause() { 3641 char filename[MAX_PATH]; 3642 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3643 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 3644 } else { 3645 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3646 } 3647 3648 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3649 if (fd != -1) { 3650 struct stat buf; 3651 ::close(fd); 3652 while (::stat(filename, &buf) == 0) { 3653 (void)::poll(NULL, 0, 100); 3654 } 3655 } else { 3656 jio_fprintf(stderr, 3657 "Could not open pause file '%s', continuing immediately.\n", filename); 3658 } 3659 } 3660 3661 // Darwin has no "environ" in a dynamic library. 3662 #ifdef __APPLE__ 3663 #include <crt_externs.h> 3664 #define environ (*_NSGetEnviron()) 3665 #else 3666 extern char** environ; 3667 #endif 3668 3669 // Run the specified command in a separate process. Return its exit value, 3670 // or -1 on failure (e.g. can't fork a new process). 3671 // Unlike system(), this function can be called from signal handler. It 3672 // doesn't block SIGINT et al. 3673 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 3674 const char * argv[4] = {"sh", "-c", cmd, NULL}; 3675 3676 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 3677 // pthread_atfork handlers and reset pthread library. All we need is a 3678 // separate process to execve. Make a direct syscall to fork process. 3679 // On IA64 there's no fork syscall, we have to use fork() and hope for 3680 // the best... 3681 pid_t pid = fork(); 3682 3683 if (pid < 0) { 3684 // fork failed 3685 return -1; 3686 3687 } else if (pid == 0) { 3688 // child process 3689 3690 // execve() in BsdThreads will call pthread_kill_other_threads_np() 3691 // first to kill every thread on the thread list. Because this list is 3692 // not reset by fork() (see notes above), execve() will instead kill 3693 // every thread in the parent process. We know this is the only thread 3694 // in the new process, so make a system call directly. 3695 // IA64 should use normal execve() from glibc to match the glibc fork() 3696 // above. 3697 execve("/bin/sh", (char* const*)argv, environ); 3698 3699 // execve failed 3700 _exit(-1); 3701 3702 } else { 3703 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 3704 // care about the actual exit code, for now. 3705 3706 int status; 3707 3708 // Wait for the child process to exit. This returns immediately if 3709 // the child has already exited. */ 3710 while (waitpid(pid, &status, 0) < 0) { 3711 switch (errno) { 3712 case ECHILD: return 0; 3713 case EINTR: break; 3714 default: return -1; 3715 } 3716 } 3717 3718 if (WIFEXITED(status)) { 3719 // The child exited normally; get its exit code. 3720 return WEXITSTATUS(status); 3721 } else if (WIFSIGNALED(status)) { 3722 // The child exited because of a signal 3723 // The best value to return is 0x80 + signal number, 3724 // because that is what all Unix shells do, and because 3725 // it allows callers to distinguish between process exit and 3726 // process death by signal. 3727 return 0x80 + WTERMSIG(status); 3728 } else { 3729 // Unknown exit code; pass it through 3730 return status; 3731 } 3732 } 3733 } 3734 3735 // Get the kern.corefile setting, or otherwise the default path to the core file 3736 // Returns the length of the string 3737 int os::get_core_path(char* buffer, size_t bufferSize) { 3738 int n = 0; 3739 #ifdef __APPLE__ 3740 char coreinfo[MAX_PATH]; 3741 size_t sz = sizeof(coreinfo); 3742 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0); 3743 if (ret == 0) { 3744 char *pid_pos = strstr(coreinfo, "%P"); 3745 // skip over the "%P" to preserve any optional custom user pattern 3746 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : ""; 3747 3748 if (pid_pos != NULL) { 3749 *pid_pos = '\0'; 3750 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail); 3751 } else { 3752 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo); 3753 } 3754 } else 3755 #endif 3756 { 3757 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id()); 3758 } 3759 // Truncate if theoretical string was longer than bufferSize 3760 n = MIN2(n, (int)bufferSize); 3761 3762 return n; 3763 } 3764 3765 bool os::supports_map_sync() { 3766 return false; 3767 } 3768 3769 #ifndef PRODUCT 3770 void TestReserveMemorySpecial_test() { 3771 // No tests available for this platform 3772 } 3773 #endif 3774 3775 bool os::start_debugging(char *buf, int buflen) { 3776 int len = (int)strlen(buf); 3777 char *p = &buf[len]; 3778 3779 jio_snprintf(p, buflen-len, 3780 "\n\n" 3781 "Do you want to debug the problem?\n\n" 3782 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 3783 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 3784 "Otherwise, press RETURN to abort...", 3785 os::current_process_id(), os::current_process_id(), 3786 os::current_thread_id(), os::current_thread_id()); 3787 3788 bool yes = os::message_box("Unexpected Error", buf); 3789 3790 if (yes) { 3791 // yes, user asked VM to launch debugger 3792 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 3793 os::current_process_id(), os::current_process_id()); 3794 3795 os::fork_and_exec(buf); 3796 yes = false; 3797 } 3798 return yes; 3799 }