ctornqvi@2520: /*
kevinw@9478: * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
goetz@6460:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
goetz@6460:  *
goetz@6460:  * This code is free software; you can redistribute it and/or modify it
goetz@6460:  * under the terms of the GNU General Public License version 2 only, as
goetz@6460:  * published by the Free Software Foundation.
goetz@6460:  *
goetz@6460:  * This code is distributed in the hope that it will be useful, but WITHOUT
goetz@6460:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
goetz@6460:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
goetz@6460:  * version 2 for more details (a copy is included in the LICENSE file that
goetz@6460:  * accompanied this code).
goetz@6460:  *
goetz@6460:  * You should have received a copy of the GNU General Public License version
goetz@6460:  * 2 along with this work; if not, write to the Free Software Foundation,
goetz@6460:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
goetz@6460:  *
goetz@6460:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
goetz@6460:  * or visit www.oracle.com if you need additional information or have any
goetz@6460:  * questions.
goetz@6460:  *
goetz@6460:  */
ctornqvi@2520: 
goetz@6460: #include "utilities/globalDefinitions.hpp"
ctornqvi@2520: #include "prims/jvm.h"
zgu@3900: #include "runtime/frame.inline.hpp"
ctornqvi@2520: #include "runtime/os.hpp"
ctornqvi@2520: #include "utilities/vmError.hpp"
ctornqvi@2520: 
goetz@6460: #include <signal.h>
ctornqvi@2520: #include <unistd.h>
ctornqvi@2520: #include <sys/resource.h>
nloodin@3783: #include <sys/utsname.h>
sla@5609: #include <pthread.h>
sla@5609: #include <signal.h>
nloodin@3783: 
drchase@6680: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
drchase@6680: 
goetz@6460: // Todo: provide a os::get_max_process_id() or similar. Number of processes
goetz@6460: // may have been configured, can be read more accurately from proc fs etc.
goetz@6460: #ifndef MAX_PID
goetz@6460: #define MAX_PID INT_MAX
goetz@6460: #endif
goetz@6460: #define IS_VALID_PID(p) (p > 0 && p < MAX_PID)
ctornqvi@2520: 
ctornqvi@2520: // Check core dump limit and report possible place where core can be found
ctornqvi@2520: void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
mikael@3903:   int n;
ctornqvi@2520:   struct rlimit rlim;
ctornqvi@2520:   bool success;
ctornqvi@2520: 
mikael@3903:   n = get_core_path(buffer, bufferSize);
ctornqvi@2520: 
ctornqvi@2520:   if (getrlimit(RLIMIT_CORE, &rlim) != 0) {
mikael@3903:     jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id());
ctornqvi@2520:     success = true;
ctornqvi@2520:   } else {
ctornqvi@2520:     switch(rlim.rlim_cur) {
ctornqvi@2520:       case RLIM_INFINITY:
mikael@3903:         jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id());
ctornqvi@2520:         success = true;
ctornqvi@2520:         break;
ctornqvi@2520:       case 0:
ctornqvi@2520:         jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again");
ctornqvi@2520:         success = false;
ctornqvi@2520:         break;
ctornqvi@2520:       default:
mikael@3903:         jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10));
ctornqvi@2520:         success = true;
ctornqvi@2520:         break;
ctornqvi@2520:     }
ctornqvi@2520:   }
ctornqvi@2520:   VMError::report_coredump_status(buffer, success);
ctornqvi@2520: }
ctornqvi@2520: 
zgu@7074: int os::get_native_stack(address* stack, int frames, int toSkip) {
zgu@3900: #ifdef _NMT_NOINLINE_
zgu@7074:   toSkip++;
zgu@3900: #endif
zgu@7074: 
zgu@7074:   int frame_idx = 0;
zgu@7074:   int num_of_frames;  // number of frames captured
zgu@3900:   frame fr = os::current_frame();
zgu@7074:   while (fr.pc() && frame_idx < frames) {
zgu@7074:     if (toSkip > 0) {
zgu@7074:       toSkip --;
zgu@7074:     } else {
zgu@7074:       stack[frame_idx ++] = fr.pc();
zgu@7074:     }
zgu@7074:     if (fr.fp() == NULL || os::is_first_C_frame(&fr)
zgu@7074:         ||fr.sender_pc() == NULL || fr.cb() != NULL) break;
zgu@7074: 
zgu@7074:     if (fr.sender_pc() && !os::is_first_C_frame(&fr)) {
zgu@7074:       fr = os::get_sender_for_C_frame(&fr);
zgu@7074:     } else {
zgu@7074:       break;
zgu@7074:     }
zgu@3900:   }
zgu@7074:   num_of_frames = frame_idx;
zgu@7074:   for (; frame_idx < frames; frame_idx ++) {
zgu@7074:     stack[frame_idx] = NULL;
zgu@3900:   }
zgu@7074: 
zgu@7074:   return num_of_frames;
zgu@7074: }
zgu@7074: 
zgu@7074: 
zgu@7074: bool os::unsetenv(const char* name) {
zgu@7074:   assert(name != NULL, "Null pointer");
zgu@7074:   return (::unsetenv(name) == 0);
zgu@3900: }
zgu@3900: 
phh@3379: int os::get_last_error() {
phh@3379:   return errno;
phh@3379: }
phh@3379: 
sla@2584: bool os::is_debugger_attached() {
sla@2584:   // not implemented
sla@2584:   return false;
sla@2584: }
sla@2584: 
sla@2584: void os::wait_for_keypress_at_exit(void) {
sla@2584:   // don't do anything on posix platforms
sla@2584:   return;
sla@2584: }
nloodin@3783: 
brutisso@4369: // Multiple threads can race in this code, and can remap over each other with MAP_FIXED,
brutisso@4369: // so on posix, unmap the section at the start and at the end of the chunk that we mapped
brutisso@4369: // rather than unmapping and remapping the whole chunk to get requested alignment.
brutisso@4369: char* os::reserve_memory_aligned(size_t size, size_t alignment) {
brutisso@4369:   assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
brutisso@4369:       "Alignment must be a multiple of allocation granularity (page size)");
brutisso@4369:   assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
brutisso@4369: 
brutisso@4369:   size_t extra_size = size + alignment;
brutisso@4369:   assert(extra_size >= size, "overflow, size is too large to allow alignment");
brutisso@4369: 
brutisso@4369:   char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
brutisso@4369: 
brutisso@4369:   if (extra_base == NULL) {
brutisso@4369:     return NULL;
brutisso@4369:   }
brutisso@4369: 
brutisso@4369:   // Do manual alignment
brutisso@4369:   char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
brutisso@4369: 
brutisso@4369:   // [  |                                       |  ]
brutisso@4369:   // ^ extra_base
brutisso@4369:   //    ^ extra_base + begin_offset == aligned_base
brutisso@4369:   //     extra_base + begin_offset + size       ^
brutisso@4369:   //                       extra_base + extra_size ^
brutisso@4369:   // |<>| == begin_offset
brutisso@4369:   //                              end_offset == |<>|
brutisso@4369:   size_t begin_offset = aligned_base - extra_base;
brutisso@4369:   size_t end_offset = (extra_base + extra_size) - (aligned_base + size);
brutisso@4369: 
brutisso@4369:   if (begin_offset > 0) {
brutisso@4369:       os::release_memory(extra_base, begin_offset);
brutisso@4369:   }
brutisso@4369: 
brutisso@4369:   if (end_offset > 0) {
brutisso@4369:       os::release_memory(extra_base + begin_offset + size, end_offset);
brutisso@4369:   }
brutisso@4369: 
brutisso@4369:   return aligned_base;
brutisso@4369: }
brutisso@4369: 
kevinw@9478: int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
kevinw@9478:   int result = ::vsnprintf(buf, len, fmt, args);
kevinw@9478:   // If an encoding error occurred (result < 0) then it's not clear
kevinw@9478:   // whether the buffer is NUL terminated, so ensure it is.
kevinw@9478:   if ((result < 0) && (len > 0)) {
kevinw@9478:     buf[len - 1] = '\0';
kevinw@9478:   }
kevinw@9478:   return result;
kevinw@9478: }
kevinw@9478: 
nloodin@3783: void os::Posix::print_load_average(outputStream* st) {
nloodin@3783:   st->print("load average:");
nloodin@3783:   double loadavg[3];
nloodin@3783:   os::loadavg(loadavg, 3);
nloodin@3783:   st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
nloodin@3783:   st->cr();
nloodin@3783: }
nloodin@3783: 
nloodin@3783: void os::Posix::print_rlimit_info(outputStream* st) {
nloodin@3783:   st->print("rlimit:");
nloodin@3783:   struct rlimit rlim;
nloodin@3783: 
nloodin@3783:   st->print(" STACK ");
nloodin@3783:   getrlimit(RLIMIT_STACK, &rlim);
nloodin@3783:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
nloodin@3783:   else st->print("%uk", rlim.rlim_cur >> 10);
nloodin@3783: 
nloodin@3783:   st->print(", CORE ");
nloodin@3783:   getrlimit(RLIMIT_CORE, &rlim);
nloodin@3783:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
nloodin@3783:   else st->print("%uk", rlim.rlim_cur >> 10);
nloodin@3783: 
goetz@6460:   // Isn't there on solaris
kvn@6462: #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix)
nloodin@3783:   st->print(", NPROC ");
nloodin@3783:   getrlimit(RLIMIT_NPROC, &rlim);
nloodin@3783:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
nloodin@3783:   else st->print("%d", rlim.rlim_cur);
nloodin@3783: #endif
nloodin@3783: 
nloodin@3783:   st->print(", NOFILE ");
nloodin@3783:   getrlimit(RLIMIT_NOFILE, &rlim);
nloodin@3783:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
nloodin@3783:   else st->print("%d", rlim.rlim_cur);
nloodin@3783: 
nloodin@3783:   st->print(", AS ");
nloodin@3783:   getrlimit(RLIMIT_AS, &rlim);
nloodin@3783:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
nloodin@3783:   else st->print("%uk", rlim.rlim_cur >> 10);
nloodin@3783:   st->cr();
nloodin@3783: }
nloodin@3783: 
nloodin@3783: void os::Posix::print_uname_info(outputStream* st) {
nloodin@3783:   // kernel
nloodin@3783:   st->print("uname:");
nloodin@3783:   struct utsname name;
nloodin@3783:   uname(&name);
drchase@6680:   st->print("%s ", name.sysname);
drchase@6680:   st->print("%s ", name.release);
drchase@6680:   st->print("%s ", name.version);
drchase@6680:   st->print("%s", name.machine);
nloodin@3783:   st->cr();
nloodin@3783: }
nloodin@3783: 
tschatzl@4854: bool os::has_allocatable_memory_limit(julong* limit) {
tschatzl@4854:   struct rlimit rlim;
tschatzl@4854:   int getrlimit_res = getrlimit(RLIMIT_AS, &rlim);
tschatzl@4854:   // if there was an error when calling getrlimit, assume that there is no limitation
tschatzl@4854:   // on virtual memory.
tschatzl@4854:   bool result;
tschatzl@4854:   if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) {
tschatzl@4854:     result = false;
tschatzl@4854:   } else {
tschatzl@4854:     *limit = (julong)rlim.rlim_cur;
tschatzl@4854:     result = true;
tschatzl@4854:   }
tschatzl@4854: #ifdef _LP64
tschatzl@4854:   return result;
tschatzl@4854: #else
tschatzl@4854:   // arbitrary virtual space limit for 32 bit Unices found by testing. If
tschatzl@4854:   // getrlimit above returned a limit, bound it with this limit. Otherwise
tschatzl@4854:   // directly use it.
tschatzl@4854:   const julong max_virtual_limit = (julong)3800*M;
tschatzl@4854:   if (result) {
tschatzl@4854:     *limit = MIN2(*limit, max_virtual_limit);
tschatzl@4854:   } else {
tschatzl@4854:     *limit = max_virtual_limit;
tschatzl@4854:   }
nloodin@3783: 
tschatzl@4854:   // bound by actually allocatable memory. The algorithm uses two bounds, an
tschatzl@4854:   // upper and a lower limit. The upper limit is the current highest amount of
tschatzl@4854:   // memory that could not be allocated, the lower limit is the current highest
tschatzl@4854:   // amount of memory that could be allocated.
tschatzl@4854:   // The algorithm iteratively refines the result by halving the difference
tschatzl@4854:   // between these limits, updating either the upper limit (if that value could
tschatzl@4854:   // not be allocated) or the lower limit (if the that value could be allocated)
tschatzl@4854:   // until the difference between these limits is "small".
tschatzl@4854: 
tschatzl@4854:   // the minimum amount of memory we care about allocating.
tschatzl@4854:   const julong min_allocation_size = M;
tschatzl@4854: 
tschatzl@4854:   julong upper_limit = *limit;
tschatzl@4854: 
tschatzl@4854:   // first check a few trivial cases
tschatzl@4854:   if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) {
tschatzl@4854:     *limit = upper_limit;
tschatzl@4854:   } else if (!is_allocatable(min_allocation_size)) {
tschatzl@4854:     // we found that not even min_allocation_size is allocatable. Return it
tschatzl@4854:     // anyway. There is no point to search for a better value any more.
tschatzl@4854:     *limit = min_allocation_size;
tschatzl@4854:   } else {
tschatzl@4854:     // perform the binary search.
tschatzl@4854:     julong lower_limit = min_allocation_size;
tschatzl@4854:     while ((upper_limit - lower_limit) > min_allocation_size) {
tschatzl@4854:       julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
tschatzl@4854:       temp_limit = align_size_down_(temp_limit, min_allocation_size);
tschatzl@4854:       if (is_allocatable(temp_limit)) {
tschatzl@4854:         lower_limit = temp_limit;
tschatzl@4854:       } else {
tschatzl@4854:         upper_limit = temp_limit;
tschatzl@4854:       }
tschatzl@4854:     }
tschatzl@4854:     *limit = lower_limit;
tschatzl@4854:   }
tschatzl@4854:   return true;
tschatzl@4854: #endif
tschatzl@4854: }
vlivanov@5027: 
vlivanov@5027: const char* os::get_current_directory(char *buf, size_t buflen) {
vlivanov@5027:   return getcwd(buf, buflen);
vlivanov@5027: }
vlivanov@5027: 
vlivanov@5027: FILE* os::open(int fd, const char* mode) {
vlivanov@5027:   return ::fdopen(fd, mode);
vlivanov@5027: }
rbackman@5424: 
andrew@9711: DIR* os::opendir(const char* dirname) {
andrew@9711:   assert(dirname != NULL, "just checking");
andrew@9711:   return ::opendir(dirname);
andrew@9711: }
andrew@9711: 
andrew@9711: struct dirent* os::readdir(DIR* dirp) {
andrew@9711:   assert(dirp != NULL, "just checking");
andrew@9711:   return ::readdir(dirp);
andrew@9711: }
andrew@9711: 
andrew@9711: int os::closedir(DIR *dirp) {
andrew@9711:   assert(dirp != NULL, "just checking");
andrew@9711:   return ::closedir(dirp);
andrew@9711: }
andrew@9711: 
bpittore@5585: // Builds a platform dependent Agent_OnLoad_<lib_name> function name
bpittore@5585: // which is used to find statically linked in agents.
bpittore@5585: // Parameters:
bpittore@5585: //            sym_name: Symbol in library we are looking for
bpittore@5585: //            lib_name: Name of library to look in, NULL for shared libs.
bpittore@5585: //            is_absolute_path == true if lib_name is absolute path to agent
bpittore@5585: //                                     such as "/a/b/libL.so"
bpittore@5585: //            == false if only the base name of the library is passed in
bpittore@5585: //               such as "L"
bpittore@5585: char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
bpittore@5585:                                     bool is_absolute_path) {
bpittore@5585:   char *agent_entry_name;
bpittore@5585:   size_t len;
bpittore@5585:   size_t name_len;
bpittore@5585:   size_t prefix_len = strlen(JNI_LIB_PREFIX);
bpittore@5585:   size_t suffix_len = strlen(JNI_LIB_SUFFIX);
bpittore@5585:   const char *start;
bpittore@5585: 
bpittore@5585:   if (lib_name != NULL) {
bpittore@5585:     len = name_len = strlen(lib_name);
bpittore@5585:     if (is_absolute_path) {
bpittore@5585:       // Need to strip path, prefix and suffix
bpittore@5585:       if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
bpittore@5585:         lib_name = ++start;
bpittore@5585:       }
bpittore@5585:       if (len <= (prefix_len + suffix_len)) {
bpittore@5585:         return NULL;
bpittore@5585:       }
bpittore@5585:       lib_name += prefix_len;
bpittore@5585:       name_len = strlen(lib_name) - suffix_len;
bpittore@5585:     }
bpittore@5585:   }
bpittore@5585:   len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
bpittore@5585:   agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
bpittore@5585:   if (agent_entry_name == NULL) {
bpittore@5585:     return NULL;
bpittore@5585:   }
bpittore@5585:   strcpy(agent_entry_name, sym_name);
bpittore@5585:   if (lib_name != NULL) {
bpittore@5585:     strcat(agent_entry_name, "_");
bpittore@5585:     strncat(agent_entry_name, lib_name, name_len);
bpittore@5585:   }
bpittore@5585:   return agent_entry_name;
bpittore@5585: }
bpittore@5585: 
goetz@6460: // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
goetz@6460: const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) {
goetz@6460: 
goetz@6460:   static const struct {
goetz@6460:     int sig; const char* name;
goetz@6460:   }
goetz@6460:   info[] =
goetz@6460:   {
goetz@6460:     {  SIGABRT,     "SIGABRT" },
goetz@6460: #ifdef SIGAIO
goetz@6460:     {  SIGAIO,      "SIGAIO" },
goetz@6460: #endif
goetz@6460:     {  SIGALRM,     "SIGALRM" },
goetz@6460: #ifdef SIGALRM1
goetz@6460:     {  SIGALRM1,    "SIGALRM1" },
goetz@6460: #endif
goetz@6460:     {  SIGBUS,      "SIGBUS" },
goetz@6460: #ifdef SIGCANCEL
goetz@6460:     {  SIGCANCEL,   "SIGCANCEL" },
goetz@6460: #endif
goetz@6460:     {  SIGCHLD,     "SIGCHLD" },
goetz@6460: #ifdef SIGCLD
goetz@6460:     {  SIGCLD,      "SIGCLD" },
goetz@6460: #endif
goetz@6460:     {  SIGCONT,     "SIGCONT" },
goetz@6460: #ifdef SIGCPUFAIL
goetz@6460:     {  SIGCPUFAIL,  "SIGCPUFAIL" },
goetz@6460: #endif
goetz@6460: #ifdef SIGDANGER
goetz@6460:     {  SIGDANGER,   "SIGDANGER" },
goetz@6460: #endif
goetz@6460: #ifdef SIGDIL
goetz@6460:     {  SIGDIL,      "SIGDIL" },
goetz@6460: #endif
goetz@6460: #ifdef SIGEMT
goetz@6460:     {  SIGEMT,      "SIGEMT" },
goetz@6460: #endif
goetz@6460:     {  SIGFPE,      "SIGFPE" },
goetz@6460: #ifdef SIGFREEZE
goetz@6460:     {  SIGFREEZE,   "SIGFREEZE" },
goetz@6460: #endif
goetz@6460: #ifdef SIGGFAULT
goetz@6460:     {  SIGGFAULT,   "SIGGFAULT" },
goetz@6460: #endif
goetz@6460: #ifdef SIGGRANT
goetz@6460:     {  SIGGRANT,    "SIGGRANT" },
goetz@6460: #endif
goetz@6460:     {  SIGHUP,      "SIGHUP" },
goetz@6460:     {  SIGILL,      "SIGILL" },
goetz@6460:     {  SIGINT,      "SIGINT" },
goetz@6460: #ifdef SIGIO
goetz@6460:     {  SIGIO,       "SIGIO" },
goetz@6460: #endif
goetz@6460: #ifdef SIGIOINT
goetz@6460:     {  SIGIOINT,    "SIGIOINT" },
goetz@6460: #endif
goetz@6460: #ifdef SIGIOT
goetz@6460:   // SIGIOT is there for BSD compatibility, but on most Unices just a
goetz@6460:   // synonym for SIGABRT. The result should be "SIGABRT", not
goetz@6460:   // "SIGIOT".
goetz@6460:   #if (SIGIOT != SIGABRT )
goetz@6460:     {  SIGIOT,      "SIGIOT" },
goetz@6460:   #endif
goetz@6460: #endif
goetz@6460: #ifdef SIGKAP
goetz@6460:     {  SIGKAP,      "SIGKAP" },
goetz@6460: #endif
goetz@6460:     {  SIGKILL,     "SIGKILL" },
goetz@6460: #ifdef SIGLOST
goetz@6460:     {  SIGLOST,     "SIGLOST" },
goetz@6460: #endif
goetz@6460: #ifdef SIGLWP
goetz@6460:     {  SIGLWP,      "SIGLWP" },
goetz@6460: #endif
goetz@6460: #ifdef SIGLWPTIMER
goetz@6460:     {  SIGLWPTIMER, "SIGLWPTIMER" },
goetz@6460: #endif
goetz@6460: #ifdef SIGMIGRATE
goetz@6460:     {  SIGMIGRATE,  "SIGMIGRATE" },
goetz@6460: #endif
goetz@6460: #ifdef SIGMSG
goetz@6460:     {  SIGMSG,      "SIGMSG" },
goetz@6460: #endif
goetz@6460:     {  SIGPIPE,     "SIGPIPE" },
goetz@6460: #ifdef SIGPOLL
goetz@6460:     {  SIGPOLL,     "SIGPOLL" },
goetz@6460: #endif
goetz@6460: #ifdef SIGPRE
goetz@6460:     {  SIGPRE,      "SIGPRE" },
goetz@6460: #endif
goetz@6460:     {  SIGPROF,     "SIGPROF" },
goetz@6460: #ifdef SIGPTY
goetz@6460:     {  SIGPTY,      "SIGPTY" },
goetz@6460: #endif
goetz@6460: #ifdef SIGPWR
goetz@6460:     {  SIGPWR,      "SIGPWR" },
goetz@6460: #endif
goetz@6460:     {  SIGQUIT,     "SIGQUIT" },
goetz@6460: #ifdef SIGRECONFIG
goetz@6460:     {  SIGRECONFIG, "SIGRECONFIG" },
goetz@6460: #endif
goetz@6460: #ifdef SIGRECOVERY
goetz@6460:     {  SIGRECOVERY, "SIGRECOVERY" },
goetz@6460: #endif
goetz@6460: #ifdef SIGRESERVE
goetz@6460:     {  SIGRESERVE,  "SIGRESERVE" },
goetz@6460: #endif
goetz@6460: #ifdef SIGRETRACT
goetz@6460:     {  SIGRETRACT,  "SIGRETRACT" },
goetz@6460: #endif
goetz@6460: #ifdef SIGSAK
goetz@6460:     {  SIGSAK,      "SIGSAK" },
goetz@6460: #endif
goetz@6460:     {  SIGSEGV,     "SIGSEGV" },
goetz@6460: #ifdef SIGSOUND
goetz@6460:     {  SIGSOUND,    "SIGSOUND" },
goetz@6460: #endif
goetz@6460:     {  SIGSTOP,     "SIGSTOP" },
goetz@6460:     {  SIGSYS,      "SIGSYS" },
goetz@6460: #ifdef SIGSYSERROR
goetz@6460:     {  SIGSYSERROR, "SIGSYSERROR" },
goetz@6460: #endif
goetz@6460: #ifdef SIGTALRM
goetz@6460:     {  SIGTALRM,    "SIGTALRM" },
goetz@6460: #endif
goetz@6460:     {  SIGTERM,     "SIGTERM" },
goetz@6460: #ifdef SIGTHAW
goetz@6460:     {  SIGTHAW,     "SIGTHAW" },
goetz@6460: #endif
goetz@6460:     {  SIGTRAP,     "SIGTRAP" },
goetz@6460: #ifdef SIGTSTP
goetz@6460:     {  SIGTSTP,     "SIGTSTP" },
goetz@6460: #endif
goetz@6460:     {  SIGTTIN,     "SIGTTIN" },
goetz@6460:     {  SIGTTOU,     "SIGTTOU" },
goetz@6460: #ifdef SIGURG
goetz@6460:     {  SIGURG,      "SIGURG" },
goetz@6460: #endif
goetz@6460:     {  SIGUSR1,     "SIGUSR1" },
goetz@6460:     {  SIGUSR2,     "SIGUSR2" },
goetz@6460: #ifdef SIGVIRT
goetz@6460:     {  SIGVIRT,     "SIGVIRT" },
goetz@6460: #endif
goetz@6460:     {  SIGVTALRM,   "SIGVTALRM" },
goetz@6460: #ifdef SIGWAITING
goetz@6460:     {  SIGWAITING,  "SIGWAITING" },
goetz@6460: #endif
goetz@6460: #ifdef SIGWINCH
goetz@6460:     {  SIGWINCH,    "SIGWINCH" },
goetz@6460: #endif
goetz@6460: #ifdef SIGWINDOW
goetz@6460:     {  SIGWINDOW,   "SIGWINDOW" },
goetz@6460: #endif
goetz@6460:     {  SIGXCPU,     "SIGXCPU" },
goetz@6460:     {  SIGXFSZ,     "SIGXFSZ" },
goetz@6460: #ifdef SIGXRES
goetz@6460:     {  SIGXRES,     "SIGXRES" },
goetz@6460: #endif
goetz@6460:     { -1, NULL }
goetz@6460:   };
goetz@6460: 
goetz@6460:   const char* ret = NULL;
goetz@6460: 
goetz@6460: #ifdef SIGRTMIN
goetz@6460:   if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
goetz@6460:     if (sig == SIGRTMIN) {
goetz@6460:       ret = "SIGRTMIN";
goetz@6460:     } else if (sig == SIGRTMAX) {
goetz@6460:       ret = "SIGRTMAX";
goetz@6460:     } else {
goetz@6460:       jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN);
goetz@6460:       return out;
goetz@6460:     }
goetz@6460:   }
goetz@6460: #endif
goetz@6460: 
goetz@6460:   if (sig > 0) {
goetz@6460:     for (int idx = 0; info[idx].sig != -1; idx ++) {
goetz@6460:       if (info[idx].sig == sig) {
goetz@6460:         ret = info[idx].name;
goetz@6460:         break;
goetz@6460:       }
goetz@6460:     }
goetz@6460:   }
goetz@6460: 
goetz@6460:   if (!ret) {
goetz@6460:     if (!is_valid_signal(sig)) {
goetz@6460:       ret = "INVALID";
goetz@6460:     } else {
goetz@6460:       ret = "UNKNOWN";
goetz@6460:     }
goetz@6460:   }
goetz@6460: 
goetz@6460:   jio_snprintf(out, outlen, ret);
goetz@6460:   return out;
goetz@6460: }
goetz@6460: 
goetz@6460: // Returns true if signal number is valid.
goetz@6460: bool os::Posix::is_valid_signal(int sig) {
goetz@6460:   // MacOS not really POSIX compliant: sigaddset does not return
goetz@6460:   // an error for invalid signal numbers. However, MacOS does not
goetz@6460:   // support real time signals and simply seems to have just 33
goetz@6460:   // signals with no holes in the signal range.
goetz@6460: #ifdef __APPLE__
goetz@6460:   return sig >= 1 && sig < NSIG;
goetz@6460: #else
goetz@6460:   // Use sigaddset to check for signal validity.
goetz@6460:   sigset_t set;
goetz@6460:   if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
goetz@6460:     return false;
goetz@6460:   }
goetz@6460:   return true;
goetz@6460: #endif
goetz@6460: }
goetz@6460: 
goetz@6460: #define NUM_IMPORTANT_SIGS 32
goetz@6460: // Returns one-line short description of a signal set in a user provided buffer.
goetz@6460: const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
goetz@6461:   assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
goetz@6460:   // Note: for shortness, just print out the first 32. That should
goetz@6460:   // cover most of the useful ones, apart from realtime signals.
goetz@6460:   for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) {
goetz@6460:     const int rc = sigismember(set, sig);
goetz@6460:     if (rc == -1 && errno == EINVAL) {
goetz@6460:       buffer[sig-1] = '?';
goetz@6460:     } else {
goetz@6460:       buffer[sig-1] = rc == 0 ? '0' : '1';
goetz@6460:     }
goetz@6460:   }
goetz@6460:   buffer[NUM_IMPORTANT_SIGS] = 0;
goetz@6460:   return buffer;
goetz@6460: }
goetz@6460: 
goetz@6460: // Prints one-line description of a signal set.
goetz@6460: void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) {
goetz@6460:   char buf[NUM_IMPORTANT_SIGS + 1];
goetz@6460:   os::Posix::describe_signal_set_short(set, buf, sizeof(buf));
drchase@6680:   st->print("%s", buf);
goetz@6460: }
goetz@6460: 
goetz@6460: // Writes one-line description of a combination of sigaction.sa_flags into a user
goetz@6460: // provided buffer. Returns that buffer.
goetz@6460: const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) {
goetz@6460:   char* p = buffer;
goetz@6460:   size_t remaining = size;
goetz@6460:   bool first = true;
goetz@6460:   int idx = 0;
goetz@6460: 
goetz@6460:   assert(buffer, "invalid argument");
goetz@6460: 
goetz@6460:   if (size == 0) {
goetz@6460:     return buffer;
goetz@6460:   }
goetz@6460: 
goetz@6460:   strncpy(buffer, "none", size);
goetz@6460: 
goetz@6460:   const struct {
aph@9610:     // NB: i is an unsigned int here because SA_RESETHAND is on some
aph@9610:     // systems 0x80000000, which is implicitly unsigned.  Assignining
aph@9610:     // it to an int field would be an overflow in unsigned-to-signed
aph@9610:     // conversion.
aph@9610:     unsigned int i;
goetz@6460:     const char* s;
goetz@6460:   } flaginfo [] = {
goetz@6460:     { SA_NOCLDSTOP, "SA_NOCLDSTOP" },
goetz@6460:     { SA_ONSTACK,   "SA_ONSTACK"   },
goetz@6460:     { SA_RESETHAND, "SA_RESETHAND" },
goetz@6460:     { SA_RESTART,   "SA_RESTART"   },
goetz@6460:     { SA_SIGINFO,   "SA_SIGINFO"   },
goetz@6460:     { SA_NOCLDWAIT, "SA_NOCLDWAIT" },
goetz@6460:     { SA_NODEFER,   "SA_NODEFER"   },
goetz@6460: #ifdef AIX
goetz@6460:     { SA_ONSTACK,   "SA_ONSTACK"   },
goetz@6460:     { SA_OLDSTYLE,  "SA_OLDSTYLE"  },
goetz@6460: #endif
goetz@6460:     { 0, NULL }
goetz@6460:   };
goetz@6460: 
goetz@6460:   for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) {
goetz@6460:     if (flags & flaginfo[idx].i) {
goetz@6460:       if (first) {
goetz@6460:         jio_snprintf(p, remaining, "%s", flaginfo[idx].s);
goetz@6460:         first = false;
goetz@6460:       } else {
goetz@6460:         jio_snprintf(p, remaining, "|%s", flaginfo[idx].s);
goetz@6460:       }
goetz@6460:       const size_t len = strlen(p);
goetz@6460:       p += len;
goetz@6460:       remaining -= len;
goetz@6460:     }
goetz@6460:   }
goetz@6460: 
goetz@6460:   buffer[size - 1] = '\0';
goetz@6460: 
goetz@6460:   return buffer;
goetz@6460: }
goetz@6460: 
goetz@6460: // Prints one-line description of a combination of sigaction.sa_flags.
goetz@6460: void os::Posix::print_sa_flags(outputStream* st, int flags) {
goetz@6460:   char buffer[0x100];
goetz@6460:   os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer));
drchase@6680:   st->print("%s", buffer);
goetz@6460: }
goetz@6460: 
goetz@6460: // Helper function for os::Posix::print_siginfo_...():
goetz@6460: // return a textual description for signal code.
goetz@6460: struct enum_sigcode_desc_t {
goetz@6460:   const char* s_name;
goetz@6460:   const char* s_desc;
goetz@6460: };
goetz@6460: 
goetz@6460: static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) {
goetz@6460: 
goetz@6460:   const struct {
goetz@6460:     int sig; int code; const char* s_code; const char* s_desc;
goetz@6460:   } t1 [] = {
goetz@6460:     { SIGILL,  ILL_ILLOPC,   "ILL_ILLOPC",   "Illegal opcode." },
goetz@6460:     { SIGILL,  ILL_ILLOPN,   "ILL_ILLOPN",   "Illegal operand." },
goetz@6460:     { SIGILL,  ILL_ILLADR,   "ILL_ILLADR",   "Illegal addressing mode." },
goetz@6460:     { SIGILL,  ILL_ILLTRP,   "ILL_ILLTRP",   "Illegal trap." },
goetz@6460:     { SIGILL,  ILL_PRVOPC,   "ILL_PRVOPC",   "Privileged opcode." },
goetz@6460:     { SIGILL,  ILL_PRVREG,   "ILL_PRVREG",   "Privileged register." },
goetz@6460:     { SIGILL,  ILL_COPROC,   "ILL_COPROC",   "Coprocessor error." },
goetz@6460:     { SIGILL,  ILL_BADSTK,   "ILL_BADSTK",   "Internal stack error." },
goetz@6460: #if defined(IA64) && defined(LINUX)
goetz@6460:     { SIGILL,  ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" },
goetz@6460:     { SIGILL,  ILL_BREAK,    "ILL_BREAK",    "Application Break instruction" },
goetz@6460: #endif
goetz@6460:     { SIGFPE,  FPE_INTDIV,   "FPE_INTDIV",   "Integer divide by zero." },
goetz@6460:     { SIGFPE,  FPE_INTOVF,   "FPE_INTOVF",   "Integer overflow." },
goetz@6460:     { SIGFPE,  FPE_FLTDIV,   "FPE_FLTDIV",   "Floating-point divide by zero." },
goetz@6460:     { SIGFPE,  FPE_FLTOVF,   "FPE_FLTOVF",   "Floating-point overflow." },
goetz@6460:     { SIGFPE,  FPE_FLTUND,   "FPE_FLTUND",   "Floating-point underflow." },
goetz@6460:     { SIGFPE,  FPE_FLTRES,   "FPE_FLTRES",   "Floating-point inexact result." },
goetz@6460:     { SIGFPE,  FPE_FLTINV,   "FPE_FLTINV",   "Invalid floating-point operation." },
goetz@6460:     { SIGFPE,  FPE_FLTSUB,   "FPE_FLTSUB",   "Subscript out of range." },
goetz@6460:     { SIGSEGV, SEGV_MAPERR,  "SEGV_MAPERR",  "Address not mapped to object." },
goetz@6460:     { SIGSEGV, SEGV_ACCERR,  "SEGV_ACCERR",  "Invalid permissions for mapped object." },
goetz@6460: #ifdef AIX
goetz@6460:     // no explanation found what keyerr would be
goetz@6460:     { SIGSEGV, SEGV_KEYERR,  "SEGV_KEYERR",  "key error" },
goetz@6460: #endif
goetz@6460: #if defined(IA64) && !defined(AIX)
goetz@6460:     { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" },
goetz@6460: #endif
gthornbr@8423: #if defined(__sparc) && defined(SOLARIS)
gthornbr@8423: // define Solaris Sparc M7 ADI SEGV signals
gthornbr@8423: #if !defined(SEGV_ACCADI)
gthornbr@8423: #define SEGV_ACCADI 3
gthornbr@8423: #endif
gthornbr@8423:     { SIGSEGV, SEGV_ACCADI,  "SEGV_ACCADI",  "ADI not enabled for mapped object." },
gthornbr@8423: #if !defined(SEGV_ACCDERR)
gthornbr@8423: #define SEGV_ACCDERR 4
gthornbr@8423: #endif
gthornbr@8423:     { SIGSEGV, SEGV_ACCDERR, "SEGV_ACCDERR", "ADI disrupting exception." },
gthornbr@8423: #if !defined(SEGV_ACCPERR)
gthornbr@8423: #define SEGV_ACCPERR 5
gthornbr@8423: #endif
gthornbr@8423:     { SIGSEGV, SEGV_ACCPERR, "SEGV_ACCPERR", "ADI precise exception." },
gthornbr@8423: #endif // defined(__sparc) && defined(SOLARIS)
goetz@6460:     { SIGBUS,  BUS_ADRALN,   "BUS_ADRALN",   "Invalid address alignment." },
goetz@6460:     { SIGBUS,  BUS_ADRERR,   "BUS_ADRERR",   "Nonexistent physical address." },
goetz@6460:     { SIGBUS,  BUS_OBJERR,   "BUS_OBJERR",   "Object-specific hardware error." },
goetz@6460:     { SIGTRAP, TRAP_BRKPT,   "TRAP_BRKPT",   "Process breakpoint." },
goetz@6460:     { SIGTRAP, TRAP_TRACE,   "TRAP_TRACE",   "Process trace trap." },
goetz@6460:     { SIGCHLD, CLD_EXITED,   "CLD_EXITED",   "Child has exited." },
goetz@6460:     { SIGCHLD, CLD_KILLED,   "CLD_KILLED",   "Child has terminated abnormally and did not create a core file." },
goetz@6460:     { SIGCHLD, CLD_DUMPED,   "CLD_DUMPED",   "Child has terminated abnormally and created a core file." },
goetz@6460:     { SIGCHLD, CLD_TRAPPED,  "CLD_TRAPPED",  "Traced child has trapped." },
goetz@6460:     { SIGCHLD, CLD_STOPPED,  "CLD_STOPPED",  "Child has stopped." },
goetz@6460:     { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." },
goetz@6460: #ifdef SIGPOLL
goetz@6460:     { SIGPOLL, POLL_OUT,     "POLL_OUT",     "Output buffers available." },
goetz@6460:     { SIGPOLL, POLL_MSG,     "POLL_MSG",     "Input message available." },
goetz@6460:     { SIGPOLL, POLL_ERR,     "POLL_ERR",     "I/O error." },
goetz@6460:     { SIGPOLL, POLL_PRI,     "POLL_PRI",     "High priority input available." },
goetz@6460:     { SIGPOLL, POLL_HUP,     "POLL_HUP",     "Device disconnected. [Option End]" },
goetz@6460: #endif
goetz@6460:     { -1, -1, NULL, NULL }
goetz@6460:   };
goetz@6460: 
goetz@6460:   // Codes valid in any signal context.
goetz@6460:   const struct {
goetz@6460:     int code; const char* s_code; const char* s_desc;
goetz@6460:   } t2 [] = {
goetz@6460:     { SI_USER,      "SI_USER",     "Signal sent by kill()." },
goetz@6460:     { SI_QUEUE,     "SI_QUEUE",    "Signal sent by the sigqueue()." },
goetz@6460:     { SI_TIMER,     "SI_TIMER",    "Signal generated by expiration of a timer set by timer_settime()." },
goetz@6460:     { SI_ASYNCIO,   "SI_ASYNCIO",  "Signal generated by completion of an asynchronous I/O request." },
goetz@6460:     { SI_MESGQ,     "SI_MESGQ",    "Signal generated by arrival of a message on an empty message queue." },
goetz@6460:     // Linux specific
goetz@6460: #ifdef SI_TKILL
goetz@6460:     { SI_TKILL,     "SI_TKILL",    "Signal sent by tkill (pthread_kill)" },
goetz@6460: #endif
goetz@6460: #ifdef SI_DETHREAD
goetz@6460:     { SI_DETHREAD,  "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" },
goetz@6460: #endif
goetz@6460: #ifdef SI_KERNEL
goetz@6460:     { SI_KERNEL,    "SI_KERNEL",   "Signal sent by kernel." },
goetz@6460: #endif
goetz@6460: #ifdef SI_SIGIO
goetz@6460:     { SI_SIGIO,     "SI_SIGIO",    "Signal sent by queued SIGIO" },
goetz@6460: #endif
goetz@6460: 
goetz@6460: #ifdef AIX
goetz@6460:     { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" },
goetz@6460:     { SI_EMPTY,     "SI_EMPTY",    "siginfo contains no useful information" },
goetz@6460: #endif
goetz@6460: 
goetz@6460: #ifdef __sun
goetz@6460:     { SI_NOINFO,    "SI_NOINFO",   "No signal information" },
goetz@6460:     { SI_RCTL,      "SI_RCTL",     "kernel generated signal via rctl action" },
goetz@6460:     { SI_LWP,       "SI_LWP",      "Signal sent via lwp_kill" },
goetz@6460: #endif
goetz@6460: 
goetz@6460:     { -1, NULL, NULL }
goetz@6460:   };
goetz@6460: 
goetz@6460:   const char* s_code = NULL;
goetz@6460:   const char* s_desc = NULL;
goetz@6460: 
goetz@6460:   for (int i = 0; t1[i].sig != -1; i ++) {
goetz@6460:     if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) {
goetz@6460:       s_code = t1[i].s_code;
goetz@6460:       s_desc = t1[i].s_desc;
goetz@6460:       break;
goetz@6460:     }
goetz@6460:   }
goetz@6460: 
goetz@6460:   if (s_code == NULL) {
goetz@6460:     for (int i = 0; t2[i].s_code != NULL; i ++) {
goetz@6460:       if (t2[i].code == si->si_code) {
goetz@6460:         s_code = t2[i].s_code;
goetz@6460:         s_desc = t2[i].s_desc;
goetz@6460:       }
goetz@6460:     }
goetz@6460:   }
goetz@6460: 
goetz@6460:   if (s_code == NULL) {
goetz@6460:     out->s_name = "unknown";
goetz@6460:     out->s_desc = "unknown";
goetz@6460:     return false;
goetz@6460:   }
goetz@6460: 
goetz@6460:   out->s_name = s_code;
goetz@6460:   out->s_desc = s_desc;
goetz@6460: 
goetz@6460:   return true;
goetz@6460: }
goetz@6460: 
goetz@6460: // A POSIX conform, platform-independend siginfo print routine.
goetz@6460: // Short print out on one line.
goetz@6460: void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) {
goetz@6460:   char buf[20];
goetz@6460:   os->print("siginfo: ");
goetz@6460: 
goetz@6460:   if (!si) {
goetz@6460:     os->print("<null>");
goetz@6460:     return;
goetz@6460:   }
goetz@6460: 
goetz@6460:   // See print_siginfo_full() for details.
goetz@6460:   const int sig = si->si_signo;
goetz@6460: 
goetz@6460:   os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf)));
goetz@6460: 
goetz@6460:   enum_sigcode_desc_t ed;
goetz@6460:   if (get_signal_code_description(si, &ed)) {
goetz@6460:     os->print(", si_code: %d (%s)", si->si_code, ed.s_name);
goetz@6460:   } else {
goetz@6460:     os->print(", si_code: %d (unknown)", si->si_code);
goetz@6460:   }
goetz@6460: 
goetz@6460:   if (si->si_errno) {
goetz@6460:     os->print(", si_errno: %d", si->si_errno);
goetz@6460:   }
goetz@6460: 
goetz@6460:   const int me = (int) ::getpid();
goetz@6460:   const int pid = (int) si->si_pid;
goetz@6460: 
goetz@6460:   if (si->si_code == SI_USER || si->si_code == SI_QUEUE) {
goetz@6460:     if (IS_VALID_PID(pid) && pid != me) {
goetz@6460:       os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid);
goetz@6460:     }
goetz@6460:   } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
goetz@6460:              sig == SIGTRAP || sig == SIGFPE) {
goetz@6460:     os->print(", si_addr: " PTR_FORMAT, si->si_addr);
goetz@6460: #ifdef SIGPOLL
goetz@6460:   } else if (sig == SIGPOLL) {
goetz@6460:     os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band);
goetz@6460: #endif
goetz@6460:   } else if (sig == SIGCHLD) {
goetz@6460:     os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status);
goetz@6460:   }
goetz@6460: }
goetz@6460: 
rbackman@5424: os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
rbackman@5424:   assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
rbackman@5424: }
rbackman@5424: 
rbackman@5424: /*
rbackman@5424:  * See the caveats for this class in os_posix.hpp
rbackman@5424:  * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
rbackman@5424:  * method and returns false. If none of the signals are raised, returns true.
rbackman@5424:  * The callback is supposed to provide the method that should be protected.
rbackman@5424:  */
rbackman@5424: bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
sla@5609:   sigset_t saved_sig_mask;
sla@5609: 
rbackman@5424:   assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
rbackman@5424:   assert(!WatcherThread::watcher_thread()->has_crash_protection(),
rbackman@5424:       "crash_protection already set?");
rbackman@5424: 
sla@5609:   // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask
sla@5609:   // since on at least some systems (OS X) siglongjmp will restore the mask
sla@5609:   // for the process, not the thread
sla@5609:   pthread_sigmask(0, NULL, &saved_sig_mask);
sla@5609:   if (sigsetjmp(_jmpbuf, 0) == 0) {
rbackman@5424:     // make sure we can see in the signal handler that we have crash protection
rbackman@5424:     // installed
rbackman@5424:     WatcherThread::watcher_thread()->set_crash_protection(this);
rbackman@5424:     cb.call();
rbackman@5424:     // and clear the crash protection
rbackman@5424:     WatcherThread::watcher_thread()->set_crash_protection(NULL);
rbackman@5424:     return true;
rbackman@5424:   }
rbackman@5424:   // this happens when we siglongjmp() back
sla@5609:   pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL);
rbackman@5424:   WatcherThread::watcher_thread()->set_crash_protection(NULL);
rbackman@5424:   return false;
rbackman@5424: }
rbackman@5424: 
rbackman@5424: void os::WatcherThreadCrashProtection::restore() {
rbackman@5424:   assert(WatcherThread::watcher_thread()->has_crash_protection(),
rbackman@5424:       "must have crash protection");
rbackman@5424: 
rbackman@5424:   siglongjmp(_jmpbuf, 1);
rbackman@5424: }
rbackman@5424: 
rbackman@5424: void os::WatcherThreadCrashProtection::check_crash_protection(int sig,
rbackman@5424:     Thread* thread) {
rbackman@5424: 
rbackman@5424:   if (thread != NULL &&
rbackman@5424:       thread->is_Watcher_thread() &&
rbackman@5424:       WatcherThread::watcher_thread()->has_crash_protection()) {
rbackman@5424: 
rbackman@5424:     if (sig == SIGSEGV || sig == SIGBUS) {
rbackman@5424:       WatcherThread::watcher_thread()->crash_protection()->restore();
rbackman@5424:     }
rbackman@5424:   }
rbackman@5424: }