Mercurial > hg > truffle
annotate src/os/posix/vm/os_posix.cpp @ 17805:bbfbe9b06038
Merge
| author | kvn |
|---|---|
| date | Thu, 13 Mar 2014 14:57:01 -0700 |
| parents | d1621038becf 2b8e28fdf503 |
| children | bb9356ec5967 78bbf4d43a14 |
| rev | line source |
|---|---|
| 2204 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| 14410 | 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 */ | |
| 2204 | 24 |
| 14410 | 25 #include "utilities/globalDefinitions.hpp" |
| 2204 | 26 #include "prims/jvm.h" |
| 6197 | 27 #include "runtime/frame.inline.hpp" |
| 2204 | 28 #include "runtime/os.hpp" |
| 29 #include "utilities/vmError.hpp" | |
| 30 | |
| 14410 | 31 #include <signal.h> |
| 2204 | 32 #include <unistd.h> |
| 33 #include <sys/resource.h> | |
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34 #include <sys/utsname.h> |
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35 #include <pthread.h> |
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36 #include <signal.h> |
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37 |
| 14410 | 38 // Todo: provide a os::get_max_process_id() or similar. Number of processes |
| 39 // may have been configured, can be read more accurately from proc fs etc. | |
| 40 #ifndef MAX_PID | |
| 41 #define MAX_PID INT_MAX | |
| 42 #endif | |
| 43 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID) | |
| 2204 | 44 |
| 45 // Check core dump limit and report possible place where core can be found | |
| 46 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { | |
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47 int n; |
| 2204 | 48 struct rlimit rlim; |
| 49 bool success; | |
| 50 | |
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51 n = get_core_path(buffer, bufferSize); |
| 2204 | 52 |
| 53 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { | |
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54 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); |
| 2204 | 55 success = true; |
| 56 } else { | |
| 57 switch(rlim.rlim_cur) { | |
| 58 case RLIM_INFINITY: | |
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59 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); |
| 2204 | 60 success = true; |
| 61 break; | |
| 62 case 0: | |
| 63 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); | |
| 64 success = false; | |
| 65 break; | |
| 66 default: | |
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67 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)); |
| 2204 | 68 success = true; |
| 69 break; | |
| 70 } | |
| 71 } | |
| 72 VMError::report_coredump_status(buffer, success); | |
| 73 } | |
| 74 | |
| 6197 | 75 address os::get_caller_pc(int n) { |
| 76 #ifdef _NMT_NOINLINE_ | |
| 77 n ++; | |
| 78 #endif | |
| 79 frame fr = os::current_frame(); | |
| 80 while (n > 0 && fr.pc() && | |
| 81 !os::is_first_C_frame(&fr) && fr.sender_pc()) { | |
| 82 fr = os::get_sender_for_C_frame(&fr); | |
| 83 n --; | |
| 84 } | |
| 85 if (n == 0) { | |
| 86 return fr.pc(); | |
| 87 } else { | |
| 88 return NULL; | |
| 89 } | |
| 90 } | |
| 91 | |
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92 int os::get_last_error() { |
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93 return errno; |
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94 } |
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95 |
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96 bool os::is_debugger_attached() { |
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97 // not implemented |
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98 return false; |
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99 } |
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100 |
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101 void os::wait_for_keypress_at_exit(void) { |
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102 // don't do anything on posix platforms |
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103 return; |
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104 } |
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105 |
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106 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED, |
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107 // so on posix, unmap the section at the start and at the end of the chunk that we mapped |
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108 // rather than unmapping and remapping the whole chunk to get requested alignment. |
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109 char* os::reserve_memory_aligned(size_t size, size_t alignment) { |
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110 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, |
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111 "Alignment must be a multiple of allocation granularity (page size)"); |
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112 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); |
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113 |
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114 size_t extra_size = size + alignment; |
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115 assert(extra_size >= size, "overflow, size is too large to allow alignment"); |
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116 |
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117 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); |
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118 |
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119 if (extra_base == NULL) { |
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120 return NULL; |
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121 } |
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122 |
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123 // Do manual alignment |
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124 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); |
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125 |
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126 // [ | | ] |
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127 // ^ extra_base |
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128 // ^ extra_base + begin_offset == aligned_base |
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129 // extra_base + begin_offset + size ^ |
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130 // extra_base + extra_size ^ |
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131 // |<>| == begin_offset |
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132 // end_offset == |<>| |
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133 size_t begin_offset = aligned_base - extra_base; |
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134 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); |
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135 |
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136 if (begin_offset > 0) { |
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137 os::release_memory(extra_base, begin_offset); |
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138 } |
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139 |
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140 if (end_offset > 0) { |
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141 os::release_memory(extra_base + begin_offset + size, end_offset); |
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142 } |
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143 |
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144 return aligned_base; |
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145 } |
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146 |
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147 void os::Posix::print_load_average(outputStream* st) { |
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148 st->print("load average:"); |
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149 double loadavg[3]; |
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150 os::loadavg(loadavg, 3); |
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151 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
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152 st->cr(); |
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153 } |
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154 |
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155 void os::Posix::print_rlimit_info(outputStream* st) { |
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156 st->print("rlimit:"); |
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157 struct rlimit rlim; |
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158 |
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159 st->print(" STACK "); |
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160 getrlimit(RLIMIT_STACK, &rlim); |
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161 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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162 else st->print("%uk", rlim.rlim_cur >> 10); |
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163 |
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164 st->print(", CORE "); |
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165 getrlimit(RLIMIT_CORE, &rlim); |
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166 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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167 else st->print("%uk", rlim.rlim_cur >> 10); |
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168 |
| 14410 | 169 // Isn't there on solaris |
| 14412 | 170 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) |
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171 st->print(", NPROC "); |
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172 getrlimit(RLIMIT_NPROC, &rlim); |
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173 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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174 else st->print("%d", rlim.rlim_cur); |
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175 #endif |
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176 |
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177 st->print(", NOFILE "); |
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178 getrlimit(RLIMIT_NOFILE, &rlim); |
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179 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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180 else st->print("%d", rlim.rlim_cur); |
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181 |
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182 st->print(", AS "); |
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183 getrlimit(RLIMIT_AS, &rlim); |
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184 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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185 else st->print("%uk", rlim.rlim_cur >> 10); |
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186 st->cr(); |
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187 } |
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188 |
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189 void os::Posix::print_uname_info(outputStream* st) { |
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190 // kernel |
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191 st->print("uname:"); |
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192 struct utsname name; |
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193 uname(&name); |
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194 st->print(name.sysname); st->print(" "); |
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195 st->print(name.release); st->print(" "); |
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196 st->print(name.version); st->print(" "); |
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197 st->print(name.machine); |
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198 st->cr(); |
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199 } |
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200 |
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201 bool os::has_allocatable_memory_limit(julong* limit) { |
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202 struct rlimit rlim; |
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203 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); |
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204 // if there was an error when calling getrlimit, assume that there is no limitation |
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205 // on virtual memory. |
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206 bool result; |
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207 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { |
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208 result = false; |
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209 } else { |
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210 *limit = (julong)rlim.rlim_cur; |
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211 result = true; |
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212 } |
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213 #ifdef _LP64 |
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214 return result; |
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215 #else |
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216 // arbitrary virtual space limit for 32 bit Unices found by testing. If |
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217 // getrlimit above returned a limit, bound it with this limit. Otherwise |
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218 // directly use it. |
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219 const julong max_virtual_limit = (julong)3800*M; |
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220 if (result) { |
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221 *limit = MIN2(*limit, max_virtual_limit); |
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222 } else { |
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223 *limit = max_virtual_limit; |
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224 } |
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225 |
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226 // bound by actually allocatable memory. The algorithm uses two bounds, an |
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227 // upper and a lower limit. The upper limit is the current highest amount of |
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228 // memory that could not be allocated, the lower limit is the current highest |
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229 // amount of memory that could be allocated. |
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230 // The algorithm iteratively refines the result by halving the difference |
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231 // between these limits, updating either the upper limit (if that value could |
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232 // not be allocated) or the lower limit (if the that value could be allocated) |
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233 // until the difference between these limits is "small". |
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234 |
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235 // the minimum amount of memory we care about allocating. |
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236 const julong min_allocation_size = M; |
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237 |
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238 julong upper_limit = *limit; |
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239 |
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240 // first check a few trivial cases |
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241 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { |
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242 *limit = upper_limit; |
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243 } else if (!is_allocatable(min_allocation_size)) { |
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244 // we found that not even min_allocation_size is allocatable. Return it |
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245 // anyway. There is no point to search for a better value any more. |
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246 *limit = min_allocation_size; |
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247 } else { |
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248 // perform the binary search. |
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249 julong lower_limit = min_allocation_size; |
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250 while ((upper_limit - lower_limit) > min_allocation_size) { |
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251 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; |
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252 temp_limit = align_size_down_(temp_limit, min_allocation_size); |
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253 if (is_allocatable(temp_limit)) { |
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254 lower_limit = temp_limit; |
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255 } else { |
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256 upper_limit = temp_limit; |
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257 } |
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258 } |
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259 *limit = lower_limit; |
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260 } |
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261 return true; |
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262 #endif |
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263 } |
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264 |
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265 const char* os::get_current_directory(char *buf, size_t buflen) { |
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266 return getcwd(buf, buflen); |
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267 } |
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268 |
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269 FILE* os::open(int fd, const char* mode) { |
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270 return ::fdopen(fd, mode); |
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271 } |
| 11151 | 272 |
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273 // Builds a platform dependent Agent_OnLoad_<lib_name> function name |
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274 // which is used to find statically linked in agents. |
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275 // Parameters: |
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276 // sym_name: Symbol in library we are looking for |
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277 // lib_name: Name of library to look in, NULL for shared libs. |
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278 // is_absolute_path == true if lib_name is absolute path to agent |
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279 // such as "/a/b/libL.so" |
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280 // == false if only the base name of the library is passed in |
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281 // such as "L" |
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282 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, |
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283 bool is_absolute_path) { |
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284 char *agent_entry_name; |
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285 size_t len; |
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286 size_t name_len; |
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287 size_t prefix_len = strlen(JNI_LIB_PREFIX); |
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288 size_t suffix_len = strlen(JNI_LIB_SUFFIX); |
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289 const char *start; |
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290 |
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291 if (lib_name != NULL) { |
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292 len = name_len = strlen(lib_name); |
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293 if (is_absolute_path) { |
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294 // Need to strip path, prefix and suffix |
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295 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { |
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296 lib_name = ++start; |
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297 } |
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298 if (len <= (prefix_len + suffix_len)) { |
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299 return NULL; |
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300 } |
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301 lib_name += prefix_len; |
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302 name_len = strlen(lib_name) - suffix_len; |
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303 } |
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304 } |
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305 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; |
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306 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); |
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307 if (agent_entry_name == NULL) { |
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308 return NULL; |
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309 } |
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310 strcpy(agent_entry_name, sym_name); |
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311 if (lib_name != NULL) { |
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312 strcat(agent_entry_name, "_"); |
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313 strncat(agent_entry_name, lib_name, name_len); |
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314 } |
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315 return agent_entry_name; |
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316 } |
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317 |
| 14410 | 318 // Returned string is a constant. For unknown signals "UNKNOWN" is returned. |
| 319 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { | |
| 320 | |
| 321 static const struct { | |
| 322 int sig; const char* name; | |
| 323 } | |
| 324 info[] = | |
| 325 { | |
| 326 { SIGABRT, "SIGABRT" }, | |
| 327 #ifdef SIGAIO | |
| 328 { SIGAIO, "SIGAIO" }, | |
| 329 #endif | |
| 330 { SIGALRM, "SIGALRM" }, | |
| 331 #ifdef SIGALRM1 | |
| 332 { SIGALRM1, "SIGALRM1" }, | |
| 333 #endif | |
| 334 { SIGBUS, "SIGBUS" }, | |
| 335 #ifdef SIGCANCEL | |
| 336 { SIGCANCEL, "SIGCANCEL" }, | |
| 337 #endif | |
| 338 { SIGCHLD, "SIGCHLD" }, | |
| 339 #ifdef SIGCLD | |
| 340 { SIGCLD, "SIGCLD" }, | |
| 341 #endif | |
| 342 { SIGCONT, "SIGCONT" }, | |
| 343 #ifdef SIGCPUFAIL | |
| 344 { SIGCPUFAIL, "SIGCPUFAIL" }, | |
| 345 #endif | |
| 346 #ifdef SIGDANGER | |
| 347 { SIGDANGER, "SIGDANGER" }, | |
| 348 #endif | |
| 349 #ifdef SIGDIL | |
| 350 { SIGDIL, "SIGDIL" }, | |
| 351 #endif | |
| 352 #ifdef SIGEMT | |
| 353 { SIGEMT, "SIGEMT" }, | |
| 354 #endif | |
| 355 { SIGFPE, "SIGFPE" }, | |
| 356 #ifdef SIGFREEZE | |
| 357 { SIGFREEZE, "SIGFREEZE" }, | |
| 358 #endif | |
| 359 #ifdef SIGGFAULT | |
| 360 { SIGGFAULT, "SIGGFAULT" }, | |
| 361 #endif | |
| 362 #ifdef SIGGRANT | |
| 363 { SIGGRANT, "SIGGRANT" }, | |
| 364 #endif | |
| 365 { SIGHUP, "SIGHUP" }, | |
| 366 { SIGILL, "SIGILL" }, | |
| 367 { SIGINT, "SIGINT" }, | |
| 368 #ifdef SIGIO | |
| 369 { SIGIO, "SIGIO" }, | |
| 370 #endif | |
| 371 #ifdef SIGIOINT | |
| 372 { SIGIOINT, "SIGIOINT" }, | |
| 373 #endif | |
| 374 #ifdef SIGIOT | |
| 375 // SIGIOT is there for BSD compatibility, but on most Unices just a | |
| 376 // synonym for SIGABRT. The result should be "SIGABRT", not | |
| 377 // "SIGIOT". | |
| 378 #if (SIGIOT != SIGABRT ) | |
| 379 { SIGIOT, "SIGIOT" }, | |
| 380 #endif | |
| 381 #endif | |
| 382 #ifdef SIGKAP | |
| 383 { SIGKAP, "SIGKAP" }, | |
| 384 #endif | |
| 385 { SIGKILL, "SIGKILL" }, | |
| 386 #ifdef SIGLOST | |
| 387 { SIGLOST, "SIGLOST" }, | |
| 388 #endif | |
| 389 #ifdef SIGLWP | |
| 390 { SIGLWP, "SIGLWP" }, | |
| 391 #endif | |
| 392 #ifdef SIGLWPTIMER | |
| 393 { SIGLWPTIMER, "SIGLWPTIMER" }, | |
| 394 #endif | |
| 395 #ifdef SIGMIGRATE | |
| 396 { SIGMIGRATE, "SIGMIGRATE" }, | |
| 397 #endif | |
| 398 #ifdef SIGMSG | |
| 399 { SIGMSG, "SIGMSG" }, | |
| 400 #endif | |
| 401 { SIGPIPE, "SIGPIPE" }, | |
| 402 #ifdef SIGPOLL | |
| 403 { SIGPOLL, "SIGPOLL" }, | |
| 404 #endif | |
| 405 #ifdef SIGPRE | |
| 406 { SIGPRE, "SIGPRE" }, | |
| 407 #endif | |
| 408 { SIGPROF, "SIGPROF" }, | |
| 409 #ifdef SIGPTY | |
| 410 { SIGPTY, "SIGPTY" }, | |
| 411 #endif | |
| 412 #ifdef SIGPWR | |
| 413 { SIGPWR, "SIGPWR" }, | |
| 414 #endif | |
| 415 { SIGQUIT, "SIGQUIT" }, | |
| 416 #ifdef SIGRECONFIG | |
| 417 { SIGRECONFIG, "SIGRECONFIG" }, | |
| 418 #endif | |
| 419 #ifdef SIGRECOVERY | |
| 420 { SIGRECOVERY, "SIGRECOVERY" }, | |
| 421 #endif | |
| 422 #ifdef SIGRESERVE | |
| 423 { SIGRESERVE, "SIGRESERVE" }, | |
| 424 #endif | |
| 425 #ifdef SIGRETRACT | |
| 426 { SIGRETRACT, "SIGRETRACT" }, | |
| 427 #endif | |
| 428 #ifdef SIGSAK | |
| 429 { SIGSAK, "SIGSAK" }, | |
| 430 #endif | |
| 431 { SIGSEGV, "SIGSEGV" }, | |
| 432 #ifdef SIGSOUND | |
| 433 { SIGSOUND, "SIGSOUND" }, | |
| 434 #endif | |
| 435 { SIGSTOP, "SIGSTOP" }, | |
| 436 { SIGSYS, "SIGSYS" }, | |
| 437 #ifdef SIGSYSERROR | |
| 438 { SIGSYSERROR, "SIGSYSERROR" }, | |
| 439 #endif | |
| 440 #ifdef SIGTALRM | |
| 441 { SIGTALRM, "SIGTALRM" }, | |
| 442 #endif | |
| 443 { SIGTERM, "SIGTERM" }, | |
| 444 #ifdef SIGTHAW | |
| 445 { SIGTHAW, "SIGTHAW" }, | |
| 446 #endif | |
| 447 { SIGTRAP, "SIGTRAP" }, | |
| 448 #ifdef SIGTSTP | |
| 449 { SIGTSTP, "SIGTSTP" }, | |
| 450 #endif | |
| 451 { SIGTTIN, "SIGTTIN" }, | |
| 452 { SIGTTOU, "SIGTTOU" }, | |
| 453 #ifdef SIGURG | |
| 454 { SIGURG, "SIGURG" }, | |
| 455 #endif | |
| 456 { SIGUSR1, "SIGUSR1" }, | |
| 457 { SIGUSR2, "SIGUSR2" }, | |
| 458 #ifdef SIGVIRT | |
| 459 { SIGVIRT, "SIGVIRT" }, | |
| 460 #endif | |
| 461 { SIGVTALRM, "SIGVTALRM" }, | |
| 462 #ifdef SIGWAITING | |
| 463 { SIGWAITING, "SIGWAITING" }, | |
| 464 #endif | |
| 465 #ifdef SIGWINCH | |
| 466 { SIGWINCH, "SIGWINCH" }, | |
| 467 #endif | |
| 468 #ifdef SIGWINDOW | |
| 469 { SIGWINDOW, "SIGWINDOW" }, | |
| 470 #endif | |
| 471 { SIGXCPU, "SIGXCPU" }, | |
| 472 { SIGXFSZ, "SIGXFSZ" }, | |
| 473 #ifdef SIGXRES | |
| 474 { SIGXRES, "SIGXRES" }, | |
| 475 #endif | |
| 476 { -1, NULL } | |
| 477 }; | |
| 478 | |
| 479 const char* ret = NULL; | |
| 480 | |
| 481 #ifdef SIGRTMIN | |
| 482 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { | |
| 483 if (sig == SIGRTMIN) { | |
| 484 ret = "SIGRTMIN"; | |
| 485 } else if (sig == SIGRTMAX) { | |
| 486 ret = "SIGRTMAX"; | |
| 487 } else { | |
| 488 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); | |
| 489 return out; | |
| 490 } | |
| 491 } | |
| 492 #endif | |
| 493 | |
| 494 if (sig > 0) { | |
| 495 for (int idx = 0; info[idx].sig != -1; idx ++) { | |
| 496 if (info[idx].sig == sig) { | |
| 497 ret = info[idx].name; | |
| 498 break; | |
| 499 } | |
| 500 } | |
| 501 } | |
| 502 | |
| 503 if (!ret) { | |
| 504 if (!is_valid_signal(sig)) { | |
| 505 ret = "INVALID"; | |
| 506 } else { | |
| 507 ret = "UNKNOWN"; | |
| 508 } | |
| 509 } | |
| 510 | |
| 511 jio_snprintf(out, outlen, ret); | |
| 512 return out; | |
| 513 } | |
| 514 | |
| 515 // Returns true if signal number is valid. | |
| 516 bool os::Posix::is_valid_signal(int sig) { | |
| 517 // MacOS not really POSIX compliant: sigaddset does not return | |
| 518 // an error for invalid signal numbers. However, MacOS does not | |
| 519 // support real time signals and simply seems to have just 33 | |
| 520 // signals with no holes in the signal range. | |
| 521 #ifdef __APPLE__ | |
| 522 return sig >= 1 && sig < NSIG; | |
| 523 #else | |
| 524 // Use sigaddset to check for signal validity. | |
| 525 sigset_t set; | |
| 526 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { | |
| 527 return false; | |
| 528 } | |
| 529 return true; | |
| 530 #endif | |
| 531 } | |
| 532 | |
| 533 #define NUM_IMPORTANT_SIGS 32 | |
| 534 // Returns one-line short description of a signal set in a user provided buffer. | |
| 535 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { | |
| 14411 | 536 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); |
| 14410 | 537 // Note: for shortness, just print out the first 32. That should |
| 538 // cover most of the useful ones, apart from realtime signals. | |
| 539 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { | |
| 540 const int rc = sigismember(set, sig); | |
| 541 if (rc == -1 && errno == EINVAL) { | |
| 542 buffer[sig-1] = '?'; | |
| 543 } else { | |
| 544 buffer[sig-1] = rc == 0 ? '0' : '1'; | |
| 545 } | |
| 546 } | |
| 547 buffer[NUM_IMPORTANT_SIGS] = 0; | |
| 548 return buffer; | |
| 549 } | |
| 550 | |
| 551 // Prints one-line description of a signal set. | |
| 552 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { | |
| 553 char buf[NUM_IMPORTANT_SIGS + 1]; | |
| 554 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); | |
| 555 st->print(buf); | |
| 556 } | |
| 557 | |
| 558 // Writes one-line description of a combination of sigaction.sa_flags into a user | |
| 559 // provided buffer. Returns that buffer. | |
| 560 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { | |
| 561 char* p = buffer; | |
| 562 size_t remaining = size; | |
| 563 bool first = true; | |
| 564 int idx = 0; | |
| 565 | |
| 566 assert(buffer, "invalid argument"); | |
| 567 | |
| 568 if (size == 0) { | |
| 569 return buffer; | |
| 570 } | |
| 571 | |
| 572 strncpy(buffer, "none", size); | |
| 573 | |
| 574 const struct { | |
| 575 int i; | |
| 576 const char* s; | |
| 577 } flaginfo [] = { | |
| 578 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, | |
| 579 { SA_ONSTACK, "SA_ONSTACK" }, | |
| 580 { SA_RESETHAND, "SA_RESETHAND" }, | |
| 581 { SA_RESTART, "SA_RESTART" }, | |
| 582 { SA_SIGINFO, "SA_SIGINFO" }, | |
| 583 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, | |
| 584 { SA_NODEFER, "SA_NODEFER" }, | |
| 585 #ifdef AIX | |
| 586 { SA_ONSTACK, "SA_ONSTACK" }, | |
| 587 { SA_OLDSTYLE, "SA_OLDSTYLE" }, | |
| 588 #endif | |
| 589 { 0, NULL } | |
| 590 }; | |
| 591 | |
| 592 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { | |
| 593 if (flags & flaginfo[idx].i) { | |
| 594 if (first) { | |
| 595 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); | |
| 596 first = false; | |
| 597 } else { | |
| 598 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); | |
| 599 } | |
| 600 const size_t len = strlen(p); | |
| 601 p += len; | |
| 602 remaining -= len; | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 buffer[size - 1] = '\0'; | |
| 607 | |
| 608 return buffer; | |
| 609 } | |
| 610 | |
| 611 // Prints one-line description of a combination of sigaction.sa_flags. | |
| 612 void os::Posix::print_sa_flags(outputStream* st, int flags) { | |
| 613 char buffer[0x100]; | |
| 614 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); | |
| 615 st->print(buffer); | |
| 616 } | |
| 617 | |
| 618 // Helper function for os::Posix::print_siginfo_...(): | |
| 619 // return a textual description for signal code. | |
| 620 struct enum_sigcode_desc_t { | |
| 621 const char* s_name; | |
| 622 const char* s_desc; | |
| 623 }; | |
| 624 | |
| 625 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { | |
| 626 | |
| 627 const struct { | |
| 628 int sig; int code; const char* s_code; const char* s_desc; | |
| 629 } t1 [] = { | |
| 630 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, | |
| 631 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, | |
| 632 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, | |
| 633 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, | |
| 634 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, | |
| 635 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, | |
| 636 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, | |
| 637 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, | |
| 638 #if defined(IA64) && defined(LINUX) | |
| 639 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, | |
| 640 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, | |
| 641 #endif | |
| 642 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, | |
| 643 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, | |
| 644 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, | |
| 645 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, | |
| 646 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, | |
| 647 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, | |
| 648 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, | |
| 649 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, | |
| 650 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, | |
| 651 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, | |
| 652 #ifdef AIX | |
| 653 // no explanation found what keyerr would be | |
| 654 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, | |
| 655 #endif | |
| 656 #if defined(IA64) && !defined(AIX) | |
| 657 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, | |
| 658 #endif | |
| 659 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, | |
| 660 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, | |
| 661 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, | |
| 662 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, | |
| 663 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, | |
| 664 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, | |
| 665 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, | |
| 666 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, | |
| 667 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, | |
| 668 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, | |
| 669 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, | |
| 670 #ifdef SIGPOLL | |
| 671 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, | |
| 672 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, | |
| 673 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, | |
| 674 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, | |
| 675 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, | |
| 676 #endif | |
| 677 { -1, -1, NULL, NULL } | |
| 678 }; | |
| 679 | |
| 680 // Codes valid in any signal context. | |
| 681 const struct { | |
| 682 int code; const char* s_code; const char* s_desc; | |
| 683 } t2 [] = { | |
| 684 { SI_USER, "SI_USER", "Signal sent by kill()." }, | |
| 685 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, | |
| 686 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, | |
| 687 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, | |
| 688 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, | |
| 689 // Linux specific | |
| 690 #ifdef SI_TKILL | |
| 691 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, | |
| 692 #endif | |
| 693 #ifdef SI_DETHREAD | |
| 694 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, | |
| 695 #endif | |
| 696 #ifdef SI_KERNEL | |
| 697 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, | |
| 698 #endif | |
| 699 #ifdef SI_SIGIO | |
| 700 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, | |
| 701 #endif | |
| 702 | |
| 703 #ifdef AIX | |
| 704 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, | |
| 705 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, | |
| 706 #endif | |
| 707 | |
| 708 #ifdef __sun | |
| 709 { SI_NOINFO, "SI_NOINFO", "No signal information" }, | |
| 710 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, | |
| 711 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, | |
| 712 #endif | |
| 713 | |
| 714 { -1, NULL, NULL } | |
| 715 }; | |
| 716 | |
| 717 const char* s_code = NULL; | |
| 718 const char* s_desc = NULL; | |
| 719 | |
| 720 for (int i = 0; t1[i].sig != -1; i ++) { | |
| 721 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { | |
| 722 s_code = t1[i].s_code; | |
| 723 s_desc = t1[i].s_desc; | |
| 724 break; | |
| 725 } | |
| 726 } | |
| 727 | |
| 728 if (s_code == NULL) { | |
| 729 for (int i = 0; t2[i].s_code != NULL; i ++) { | |
| 730 if (t2[i].code == si->si_code) { | |
| 731 s_code = t2[i].s_code; | |
| 732 s_desc = t2[i].s_desc; | |
| 733 } | |
| 734 } | |
| 735 } | |
| 736 | |
| 737 if (s_code == NULL) { | |
| 738 out->s_name = "unknown"; | |
| 739 out->s_desc = "unknown"; | |
| 740 return false; | |
| 741 } | |
| 742 | |
| 743 out->s_name = s_code; | |
| 744 out->s_desc = s_desc; | |
| 745 | |
| 746 return true; | |
| 747 } | |
| 748 | |
| 749 // A POSIX conform, platform-independend siginfo print routine. | |
| 750 // Short print out on one line. | |
| 751 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) { | |
| 752 char buf[20]; | |
| 753 os->print("siginfo: "); | |
| 754 | |
| 755 if (!si) { | |
| 756 os->print("<null>"); | |
| 757 return; | |
| 758 } | |
| 759 | |
| 760 // See print_siginfo_full() for details. | |
| 761 const int sig = si->si_signo; | |
| 762 | |
| 763 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); | |
| 764 | |
| 765 enum_sigcode_desc_t ed; | |
| 766 if (get_signal_code_description(si, &ed)) { | |
| 767 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); | |
| 768 } else { | |
| 769 os->print(", si_code: %d (unknown)", si->si_code); | |
| 770 } | |
| 771 | |
| 772 if (si->si_errno) { | |
| 773 os->print(", si_errno: %d", si->si_errno); | |
| 774 } | |
| 775 | |
| 776 const int me = (int) ::getpid(); | |
| 777 const int pid = (int) si->si_pid; | |
| 778 | |
| 779 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { | |
| 780 if (IS_VALID_PID(pid) && pid != me) { | |
| 781 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid); | |
| 782 } | |
| 783 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || | |
| 784 sig == SIGTRAP || sig == SIGFPE) { | |
| 785 os->print(", si_addr: " PTR_FORMAT, si->si_addr); | |
| 786 #ifdef SIGPOLL | |
| 787 } else if (sig == SIGPOLL) { | |
| 788 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band); | |
| 789 #endif | |
| 790 } else if (sig == SIGCHLD) { | |
| 791 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status); | |
| 792 } | |
| 793 } | |
| 794 | |
| 11151 | 795 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { |
| 796 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); | |
| 797 } | |
| 798 | |
| 799 /* | |
| 800 * See the caveats for this class in os_posix.hpp | |
| 801 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this | |
| 802 * method and returns false. If none of the signals are raised, returns true. | |
| 803 * The callback is supposed to provide the method that should be protected. | |
| 804 */ | |
| 805 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { | |
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806 sigset_t saved_sig_mask; |
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807 |
| 11151 | 808 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); |
| 809 assert(!WatcherThread::watcher_thread()->has_crash_protection(), | |
| 810 "crash_protection already set?"); | |
| 811 | |
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812 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask |
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813 // since on at least some systems (OS X) siglongjmp will restore the mask |
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814 // for the process, not the thread |
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815 pthread_sigmask(0, NULL, &saved_sig_mask); |
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816 if (sigsetjmp(_jmpbuf, 0) == 0) { |
| 11151 | 817 // make sure we can see in the signal handler that we have crash protection |
| 818 // installed | |
| 819 WatcherThread::watcher_thread()->set_crash_protection(this); | |
| 820 cb.call(); | |
| 821 // and clear the crash protection | |
| 822 WatcherThread::watcher_thread()->set_crash_protection(NULL); | |
| 823 return true; | |
| 824 } | |
| 825 // this happens when we siglongjmp() back | |
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826 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); |
| 11151 | 827 WatcherThread::watcher_thread()->set_crash_protection(NULL); |
| 828 return false; | |
| 829 } | |
| 830 | |
| 831 void os::WatcherThreadCrashProtection::restore() { | |
| 832 assert(WatcherThread::watcher_thread()->has_crash_protection(), | |
| 833 "must have crash protection"); | |
| 834 | |
| 835 siglongjmp(_jmpbuf, 1); | |
| 836 } | |
| 837 | |
| 838 void os::WatcherThreadCrashProtection::check_crash_protection(int sig, | |
| 839 Thread* thread) { | |
| 840 | |
| 841 if (thread != NULL && | |
| 842 thread->is_Watcher_thread() && | |
| 843 WatcherThread::watcher_thread()->has_crash_protection()) { | |
| 844 | |
| 845 if (sig == SIGSEGV || sig == SIGBUS) { | |
| 846 WatcherThread::watcher_thread()->crash_protection()->restore(); | |
| 847 } | |
| 848 } | |
| 849 } |