os_posix.cpp revision 3934:730cc4ddd550
1/* 2* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. 3* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4* 5* This code is free software; you can redistribute it and/or modify it 6* under the terms of the GNU General Public License version 2 only, as 7* published by the Free Software Foundation. 8* 9* This code is distributed in the hope that it will be useful, but WITHOUT 10* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12* version 2 for more details (a copy is included in the LICENSE file that 13* accompanied this code). 14* 15* You should have received a copy of the GNU General Public License version 16* 2 along with this work; if not, write to the Free Software Foundation, 17* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18* 19* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20* or visit www.oracle.com if you need additional information or have any 21* questions. 22* 23*/ 24 25#include "prims/jvm.h" 26#include "runtime/frame.inline.hpp" 27#include "runtime/os.hpp" 28#include "utilities/vmError.hpp" 29 30#include <unistd.h> 31#include <sys/resource.h> 32#include <sys/utsname.h> 33 34 35// Check core dump limit and report possible place where core can be found 36void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 37 int n; 38 struct rlimit rlim; 39 bool success; 40 41 n = get_core_path(buffer, bufferSize); 42 43 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { 44 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); 45 success = true; 46 } else { 47 switch(rlim.rlim_cur) { 48 case RLIM_INFINITY: 49 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); 50 success = true; 51 break; 52 case 0: 53 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); 54 success = false; 55 break; 56 default: 57 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)); 58 success = true; 59 break; 60 } 61 } 62 VMError::report_coredump_status(buffer, success); 63} 64 65address os::get_caller_pc(int n) { 66#ifdef _NMT_NOINLINE_ 67 n ++; 68#endif 69 frame fr = os::current_frame(); 70 while (n > 0 && fr.pc() && 71 !os::is_first_C_frame(&fr) && fr.sender_pc()) { 72 fr = os::get_sender_for_C_frame(&fr); 73 n --; 74 } 75 if (n == 0) { 76 return fr.pc(); 77 } else { 78 return NULL; 79 } 80} 81 82int os::get_last_error() { 83 return errno; 84} 85 86bool os::is_debugger_attached() { 87 // not implemented 88 return false; 89} 90 91void os::wait_for_keypress_at_exit(void) { 92 // don't do anything on posix platforms 93 return; 94} 95 96// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, 97// so on posix, unmap the section at the start and at the end of the chunk that we mapped 98// rather than unmapping and remapping the whole chunk to get requested alignment. 99char* os::reserve_memory_aligned(size_t size, size_t alignment) { 100 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 101 "Alignment must be a multiple of allocation granularity (page size)"); 102 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 103 104 size_t extra_size = size + alignment; 105 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 106 107 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 108 109 if (extra_base == NULL) { 110 return NULL; 111 } 112 113 // Do manual alignment 114 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 115 116 // [ | | ] 117 // ^ extra_base 118 // ^ extra_base + begin_offset == aligned_base 119 // extra_base + begin_offset + size ^ 120 // extra_base + extra_size ^ 121 // |<>| == begin_offset 122 // end_offset == |<>| 123 size_t begin_offset = aligned_base - extra_base; 124 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); 125 126 if (begin_offset > 0) { 127 os::release_memory(extra_base, begin_offset); 128 } 129 130 if (end_offset > 0) { 131 os::release_memory(extra_base + begin_offset + size, end_offset); 132 } 133 134 return aligned_base; 135} 136 137void os::Posix::print_load_average(outputStream* st) { 138 st->print("load average:"); 139 double loadavg[3]; 140 os::loadavg(loadavg, 3); 141 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 142 st->cr(); 143} 144 145void os::Posix::print_rlimit_info(outputStream* st) { 146 st->print("rlimit:"); 147 struct rlimit rlim; 148 149 st->print(" STACK "); 150 getrlimit(RLIMIT_STACK, &rlim); 151 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 152 else st->print("%uk", rlim.rlim_cur >> 10); 153 154 st->print(", CORE "); 155 getrlimit(RLIMIT_CORE, &rlim); 156 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 157 else st->print("%uk", rlim.rlim_cur >> 10); 158 159 //Isn't there on solaris 160#ifndef TARGET_OS_FAMILY_solaris 161 st->print(", NPROC "); 162 getrlimit(RLIMIT_NPROC, &rlim); 163 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 164 else st->print("%d", rlim.rlim_cur); 165#endif 166 167 st->print(", NOFILE "); 168 getrlimit(RLIMIT_NOFILE, &rlim); 169 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 170 else st->print("%d", rlim.rlim_cur); 171 172 st->print(", AS "); 173 getrlimit(RLIMIT_AS, &rlim); 174 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 175 else st->print("%uk", rlim.rlim_cur >> 10); 176 st->cr(); 177} 178 179void os::Posix::print_uname_info(outputStream* st) { 180 // kernel 181 st->print("uname:"); 182 struct utsname name; 183 uname(&name); 184 st->print(name.sysname); st->print(" "); 185 st->print(name.release); st->print(" "); 186 st->print(name.version); st->print(" "); 187 st->print(name.machine); 188 st->cr(); 189} 190 191 192