Mercurial > hg > graal-compiler
annotate src/os/posix/vm/os_posix.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 4ca6dc0799b6 78bbf4d43a14 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 2204 | 1 /* |
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2 * Copyright (c) 1999, 2014, 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 |
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
| 14410 | 40 // Todo: provide a os::get_max_process_id() or similar. Number of processes |
| 41 // may have been configured, can be read more accurately from proc fs etc. | |
| 42 #ifndef MAX_PID | |
| 43 #define MAX_PID INT_MAX | |
| 44 #endif | |
| 45 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID) | |
| 2204 | 46 |
| 47 // Check core dump limit and report possible place where core can be found | |
| 48 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { | |
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49 int n; |
| 2204 | 50 struct rlimit rlim; |
| 51 bool success; | |
| 52 | |
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53 n = get_core_path(buffer, bufferSize); |
| 2204 | 54 |
| 55 if (getrlimit(RLIMIT_CORE, &rlim) != 0) { | |
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56 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); |
| 2204 | 57 success = true; |
| 58 } else { | |
| 59 switch(rlim.rlim_cur) { | |
| 60 case RLIM_INFINITY: | |
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61 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); |
| 2204 | 62 success = true; |
| 63 break; | |
| 64 case 0: | |
| 65 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); | |
| 66 success = false; | |
| 67 break; | |
| 68 default: | |
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69 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 | 70 success = true; |
| 71 break; | |
| 72 } | |
| 73 } | |
| 74 VMError::report_coredump_status(buffer, success); | |
| 75 } | |
| 76 | |
| 6197 | 77 address os::get_caller_pc(int n) { |
| 78 #ifdef _NMT_NOINLINE_ | |
| 79 n ++; | |
| 80 #endif | |
| 81 frame fr = os::current_frame(); | |
| 82 while (n > 0 && fr.pc() && | |
| 83 !os::is_first_C_frame(&fr) && fr.sender_pc()) { | |
| 84 fr = os::get_sender_for_C_frame(&fr); | |
| 85 n --; | |
| 86 } | |
| 87 if (n == 0) { | |
| 88 return fr.pc(); | |
| 89 } else { | |
| 90 return NULL; | |
| 91 } | |
| 92 } | |
| 93 | |
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94 int os::get_last_error() { |
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95 return errno; |
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96 } |
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97 |
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98 bool os::is_debugger_attached() { |
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99 // not implemented |
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100 return false; |
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101 } |
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102 |
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103 void os::wait_for_keypress_at_exit(void) { |
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104 // don't do anything on posix platforms |
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105 return; |
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106 } |
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107 |
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108 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED, |
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109 // so on posix, unmap the section at the start and at the end of the chunk that we mapped |
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110 // rather than unmapping and remapping the whole chunk to get requested alignment. |
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111 char* os::reserve_memory_aligned(size_t size, size_t alignment) { |
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112 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, |
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113 "Alignment must be a multiple of allocation granularity (page size)"); |
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114 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); |
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115 |
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116 size_t extra_size = size + alignment; |
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117 assert(extra_size >= size, "overflow, size is too large to allow alignment"); |
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118 |
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119 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); |
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120 |
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121 if (extra_base == NULL) { |
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122 return NULL; |
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123 } |
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124 |
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125 // Do manual alignment |
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126 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); |
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127 |
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128 // [ | | ] |
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129 // ^ extra_base |
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130 // ^ extra_base + begin_offset == aligned_base |
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131 // extra_base + begin_offset + size ^ |
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132 // extra_base + extra_size ^ |
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133 // |<>| == begin_offset |
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134 // end_offset == |<>| |
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135 size_t begin_offset = aligned_base - extra_base; |
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136 size_t end_offset = (extra_base + extra_size) - (aligned_base + size); |
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137 |
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138 if (begin_offset > 0) { |
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139 os::release_memory(extra_base, begin_offset); |
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140 } |
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141 |
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142 if (end_offset > 0) { |
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143 os::release_memory(extra_base + begin_offset + size, end_offset); |
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144 } |
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145 |
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146 return aligned_base; |
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147 } |
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148 |
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149 void os::Posix::print_load_average(outputStream* st) { |
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150 st->print("load average:"); |
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151 double loadavg[3]; |
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152 os::loadavg(loadavg, 3); |
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153 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
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154 st->cr(); |
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155 } |
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156 |
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157 void os::Posix::print_rlimit_info(outputStream* st) { |
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158 st->print("rlimit:"); |
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159 struct rlimit rlim; |
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160 |
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161 st->print(" STACK "); |
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162 getrlimit(RLIMIT_STACK, &rlim); |
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163 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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164 else st->print("%uk", rlim.rlim_cur >> 10); |
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165 |
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166 st->print(", CORE "); |
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167 getrlimit(RLIMIT_CORE, &rlim); |
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168 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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169 else st->print("%uk", rlim.rlim_cur >> 10); |
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170 |
| 14410 | 171 // Isn't there on solaris |
| 14412 | 172 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix) |
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173 st->print(", NPROC "); |
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174 getrlimit(RLIMIT_NPROC, &rlim); |
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175 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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176 else st->print("%d", rlim.rlim_cur); |
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177 #endif |
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178 |
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179 st->print(", NOFILE "); |
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180 getrlimit(RLIMIT_NOFILE, &rlim); |
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181 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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182 else st->print("%d", rlim.rlim_cur); |
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183 |
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184 st->print(", AS "); |
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185 getrlimit(RLIMIT_AS, &rlim); |
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186 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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187 else st->print("%uk", rlim.rlim_cur >> 10); |
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188 st->cr(); |
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189 } |
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190 |
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191 void os::Posix::print_uname_info(outputStream* st) { |
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192 // kernel |
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193 st->print("uname:"); |
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194 struct utsname name; |
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195 uname(&name); |
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196 st->print("%s ", name.sysname); |
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197 st->print("%s ", name.release); |
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198 st->print("%s ", name.version); |
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199 st->print("%s", name.machine); |
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200 st->cr(); |
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201 } |
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202 |
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203 bool os::has_allocatable_memory_limit(julong* limit) { |
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204 struct rlimit rlim; |
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205 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); |
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206 // if there was an error when calling getrlimit, assume that there is no limitation |
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207 // on virtual memory. |
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208 bool result; |
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209 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { |
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210 result = false; |
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211 } else { |
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212 *limit = (julong)rlim.rlim_cur; |
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213 result = true; |
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214 } |
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215 #ifdef _LP64 |
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216 return result; |
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217 #else |
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218 // arbitrary virtual space limit for 32 bit Unices found by testing. If |
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219 // getrlimit above returned a limit, bound it with this limit. Otherwise |
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220 // directly use it. |
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221 const julong max_virtual_limit = (julong)3800*M; |
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222 if (result) { |
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223 *limit = MIN2(*limit, max_virtual_limit); |
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224 } else { |
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225 *limit = max_virtual_limit; |
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226 } |
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227 |
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228 // bound by actually allocatable memory. The algorithm uses two bounds, an |
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229 // upper and a lower limit. The upper limit is the current highest amount of |
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230 // memory that could not be allocated, the lower limit is the current highest |
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231 // amount of memory that could be allocated. |
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232 // The algorithm iteratively refines the result by halving the difference |
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233 // between these limits, updating either the upper limit (if that value could |
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234 // not be allocated) or the lower limit (if the that value could be allocated) |
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235 // until the difference between these limits is "small". |
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236 |
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237 // the minimum amount of memory we care about allocating. |
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238 const julong min_allocation_size = M; |
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239 |
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240 julong upper_limit = *limit; |
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241 |
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242 // first check a few trivial cases |
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243 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { |
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244 *limit = upper_limit; |
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245 } else if (!is_allocatable(min_allocation_size)) { |
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246 // we found that not even min_allocation_size is allocatable. Return it |
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247 // anyway. There is no point to search for a better value any more. |
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248 *limit = min_allocation_size; |
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249 } else { |
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250 // perform the binary search. |
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251 julong lower_limit = min_allocation_size; |
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252 while ((upper_limit - lower_limit) > min_allocation_size) { |
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253 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; |
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254 temp_limit = align_size_down_(temp_limit, min_allocation_size); |
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255 if (is_allocatable(temp_limit)) { |
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256 lower_limit = temp_limit; |
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257 } else { |
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258 upper_limit = temp_limit; |
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259 } |
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260 } |
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261 *limit = lower_limit; |
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262 } |
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263 return true; |
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264 #endif |
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265 } |
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266 |
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267 const char* os::get_current_directory(char *buf, size_t buflen) { |
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268 return getcwd(buf, buflen); |
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269 } |
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270 |
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271 FILE* os::open(int fd, const char* mode) { |
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272 return ::fdopen(fd, mode); |
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273 } |
| 11151 | 274 |
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275 // Builds a platform dependent Agent_OnLoad_<lib_name> function name |
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276 // which is used to find statically linked in agents. |
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277 // Parameters: |
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278 // sym_name: Symbol in library we are looking for |
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279 // lib_name: Name of library to look in, NULL for shared libs. |
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280 // is_absolute_path == true if lib_name is absolute path to agent |
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281 // such as "/a/b/libL.so" |
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282 // == false if only the base name of the library is passed in |
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283 // such as "L" |
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284 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, |
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285 bool is_absolute_path) { |
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286 char *agent_entry_name; |
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287 size_t len; |
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288 size_t name_len; |
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289 size_t prefix_len = strlen(JNI_LIB_PREFIX); |
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290 size_t suffix_len = strlen(JNI_LIB_SUFFIX); |
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291 const char *start; |
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292 |
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293 if (lib_name != NULL) { |
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294 len = name_len = strlen(lib_name); |
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295 if (is_absolute_path) { |
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296 // Need to strip path, prefix and suffix |
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297 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { |
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298 lib_name = ++start; |
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299 } |
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300 if (len <= (prefix_len + suffix_len)) { |
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301 return NULL; |
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302 } |
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303 lib_name += prefix_len; |
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304 name_len = strlen(lib_name) - suffix_len; |
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305 } |
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306 } |
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307 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; |
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308 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); |
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309 if (agent_entry_name == NULL) { |
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310 return NULL; |
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311 } |
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312 strcpy(agent_entry_name, sym_name); |
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313 if (lib_name != NULL) { |
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314 strcat(agent_entry_name, "_"); |
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315 strncat(agent_entry_name, lib_name, name_len); |
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316 } |
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317 return agent_entry_name; |
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318 } |
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319 |
| 14410 | 320 // Returned string is a constant. For unknown signals "UNKNOWN" is returned. |
| 321 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) { | |
| 322 | |
| 323 static const struct { | |
| 324 int sig; const char* name; | |
| 325 } | |
| 326 info[] = | |
| 327 { | |
| 328 { SIGABRT, "SIGABRT" }, | |
| 329 #ifdef SIGAIO | |
| 330 { SIGAIO, "SIGAIO" }, | |
| 331 #endif | |
| 332 { SIGALRM, "SIGALRM" }, | |
| 333 #ifdef SIGALRM1 | |
| 334 { SIGALRM1, "SIGALRM1" }, | |
| 335 #endif | |
| 336 { SIGBUS, "SIGBUS" }, | |
| 337 #ifdef SIGCANCEL | |
| 338 { SIGCANCEL, "SIGCANCEL" }, | |
| 339 #endif | |
| 340 { SIGCHLD, "SIGCHLD" }, | |
| 341 #ifdef SIGCLD | |
| 342 { SIGCLD, "SIGCLD" }, | |
| 343 #endif | |
| 344 { SIGCONT, "SIGCONT" }, | |
| 345 #ifdef SIGCPUFAIL | |
| 346 { SIGCPUFAIL, "SIGCPUFAIL" }, | |
| 347 #endif | |
| 348 #ifdef SIGDANGER | |
| 349 { SIGDANGER, "SIGDANGER" }, | |
| 350 #endif | |
| 351 #ifdef SIGDIL | |
| 352 { SIGDIL, "SIGDIL" }, | |
| 353 #endif | |
| 354 #ifdef SIGEMT | |
| 355 { SIGEMT, "SIGEMT" }, | |
| 356 #endif | |
| 357 { SIGFPE, "SIGFPE" }, | |
| 358 #ifdef SIGFREEZE | |
| 359 { SIGFREEZE, "SIGFREEZE" }, | |
| 360 #endif | |
| 361 #ifdef SIGGFAULT | |
| 362 { SIGGFAULT, "SIGGFAULT" }, | |
| 363 #endif | |
| 364 #ifdef SIGGRANT | |
| 365 { SIGGRANT, "SIGGRANT" }, | |
| 366 #endif | |
| 367 { SIGHUP, "SIGHUP" }, | |
| 368 { SIGILL, "SIGILL" }, | |
| 369 { SIGINT, "SIGINT" }, | |
| 370 #ifdef SIGIO | |
| 371 { SIGIO, "SIGIO" }, | |
| 372 #endif | |
| 373 #ifdef SIGIOINT | |
| 374 { SIGIOINT, "SIGIOINT" }, | |
| 375 #endif | |
| 376 #ifdef SIGIOT | |
| 377 // SIGIOT is there for BSD compatibility, but on most Unices just a | |
| 378 // synonym for SIGABRT. The result should be "SIGABRT", not | |
| 379 // "SIGIOT". | |
| 380 #if (SIGIOT != SIGABRT ) | |
| 381 { SIGIOT, "SIGIOT" }, | |
| 382 #endif | |
| 383 #endif | |
| 384 #ifdef SIGKAP | |
| 385 { SIGKAP, "SIGKAP" }, | |
| 386 #endif | |
| 387 { SIGKILL, "SIGKILL" }, | |
| 388 #ifdef SIGLOST | |
| 389 { SIGLOST, "SIGLOST" }, | |
| 390 #endif | |
| 391 #ifdef SIGLWP | |
| 392 { SIGLWP, "SIGLWP" }, | |
| 393 #endif | |
| 394 #ifdef SIGLWPTIMER | |
| 395 { SIGLWPTIMER, "SIGLWPTIMER" }, | |
| 396 #endif | |
| 397 #ifdef SIGMIGRATE | |
| 398 { SIGMIGRATE, "SIGMIGRATE" }, | |
| 399 #endif | |
| 400 #ifdef SIGMSG | |
| 401 { SIGMSG, "SIGMSG" }, | |
| 402 #endif | |
| 403 { SIGPIPE, "SIGPIPE" }, | |
| 404 #ifdef SIGPOLL | |
| 405 { SIGPOLL, "SIGPOLL" }, | |
| 406 #endif | |
| 407 #ifdef SIGPRE | |
| 408 { SIGPRE, "SIGPRE" }, | |
| 409 #endif | |
| 410 { SIGPROF, "SIGPROF" }, | |
| 411 #ifdef SIGPTY | |
| 412 { SIGPTY, "SIGPTY" }, | |
| 413 #endif | |
| 414 #ifdef SIGPWR | |
| 415 { SIGPWR, "SIGPWR" }, | |
| 416 #endif | |
| 417 { SIGQUIT, "SIGQUIT" }, | |
| 418 #ifdef SIGRECONFIG | |
| 419 { SIGRECONFIG, "SIGRECONFIG" }, | |
| 420 #endif | |
| 421 #ifdef SIGRECOVERY | |
| 422 { SIGRECOVERY, "SIGRECOVERY" }, | |
| 423 #endif | |
| 424 #ifdef SIGRESERVE | |
| 425 { SIGRESERVE, "SIGRESERVE" }, | |
| 426 #endif | |
| 427 #ifdef SIGRETRACT | |
| 428 { SIGRETRACT, "SIGRETRACT" }, | |
| 429 #endif | |
| 430 #ifdef SIGSAK | |
| 431 { SIGSAK, "SIGSAK" }, | |
| 432 #endif | |
| 433 { SIGSEGV, "SIGSEGV" }, | |
| 434 #ifdef SIGSOUND | |
| 435 { SIGSOUND, "SIGSOUND" }, | |
| 436 #endif | |
| 437 { SIGSTOP, "SIGSTOP" }, | |
| 438 { SIGSYS, "SIGSYS" }, | |
| 439 #ifdef SIGSYSERROR | |
| 440 { SIGSYSERROR, "SIGSYSERROR" }, | |
| 441 #endif | |
| 442 #ifdef SIGTALRM | |
| 443 { SIGTALRM, "SIGTALRM" }, | |
| 444 #endif | |
| 445 { SIGTERM, "SIGTERM" }, | |
| 446 #ifdef SIGTHAW | |
| 447 { SIGTHAW, "SIGTHAW" }, | |
| 448 #endif | |
| 449 { SIGTRAP, "SIGTRAP" }, | |
| 450 #ifdef SIGTSTP | |
| 451 { SIGTSTP, "SIGTSTP" }, | |
| 452 #endif | |
| 453 { SIGTTIN, "SIGTTIN" }, | |
| 454 { SIGTTOU, "SIGTTOU" }, | |
| 455 #ifdef SIGURG | |
| 456 { SIGURG, "SIGURG" }, | |
| 457 #endif | |
| 458 { SIGUSR1, "SIGUSR1" }, | |
| 459 { SIGUSR2, "SIGUSR2" }, | |
| 460 #ifdef SIGVIRT | |
| 461 { SIGVIRT, "SIGVIRT" }, | |
| 462 #endif | |
| 463 { SIGVTALRM, "SIGVTALRM" }, | |
| 464 #ifdef SIGWAITING | |
| 465 { SIGWAITING, "SIGWAITING" }, | |
| 466 #endif | |
| 467 #ifdef SIGWINCH | |
| 468 { SIGWINCH, "SIGWINCH" }, | |
| 469 #endif | |
| 470 #ifdef SIGWINDOW | |
| 471 { SIGWINDOW, "SIGWINDOW" }, | |
| 472 #endif | |
| 473 { SIGXCPU, "SIGXCPU" }, | |
| 474 { SIGXFSZ, "SIGXFSZ" }, | |
| 475 #ifdef SIGXRES | |
| 476 { SIGXRES, "SIGXRES" }, | |
| 477 #endif | |
| 478 { -1, NULL } | |
| 479 }; | |
| 480 | |
| 481 const char* ret = NULL; | |
| 482 | |
| 483 #ifdef SIGRTMIN | |
| 484 if (sig >= SIGRTMIN && sig <= SIGRTMAX) { | |
| 485 if (sig == SIGRTMIN) { | |
| 486 ret = "SIGRTMIN"; | |
| 487 } else if (sig == SIGRTMAX) { | |
| 488 ret = "SIGRTMAX"; | |
| 489 } else { | |
| 490 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN); | |
| 491 return out; | |
| 492 } | |
| 493 } | |
| 494 #endif | |
| 495 | |
| 496 if (sig > 0) { | |
| 497 for (int idx = 0; info[idx].sig != -1; idx ++) { | |
| 498 if (info[idx].sig == sig) { | |
| 499 ret = info[idx].name; | |
| 500 break; | |
| 501 } | |
| 502 } | |
| 503 } | |
| 504 | |
| 505 if (!ret) { | |
| 506 if (!is_valid_signal(sig)) { | |
| 507 ret = "INVALID"; | |
| 508 } else { | |
| 509 ret = "UNKNOWN"; | |
| 510 } | |
| 511 } | |
| 512 | |
| 513 jio_snprintf(out, outlen, ret); | |
| 514 return out; | |
| 515 } | |
| 516 | |
| 517 // Returns true if signal number is valid. | |
| 518 bool os::Posix::is_valid_signal(int sig) { | |
| 519 // MacOS not really POSIX compliant: sigaddset does not return | |
| 520 // an error for invalid signal numbers. However, MacOS does not | |
| 521 // support real time signals and simply seems to have just 33 | |
| 522 // signals with no holes in the signal range. | |
| 523 #ifdef __APPLE__ | |
| 524 return sig >= 1 && sig < NSIG; | |
| 525 #else | |
| 526 // Use sigaddset to check for signal validity. | |
| 527 sigset_t set; | |
| 528 if (sigaddset(&set, sig) == -1 && errno == EINVAL) { | |
| 529 return false; | |
| 530 } | |
| 531 return true; | |
| 532 #endif | |
| 533 } | |
| 534 | |
| 535 #define NUM_IMPORTANT_SIGS 32 | |
| 536 // Returns one-line short description of a signal set in a user provided buffer. | |
| 537 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) { | |
| 14411 | 538 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size"); |
| 14410 | 539 // Note: for shortness, just print out the first 32. That should |
| 540 // cover most of the useful ones, apart from realtime signals. | |
| 541 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) { | |
| 542 const int rc = sigismember(set, sig); | |
| 543 if (rc == -1 && errno == EINVAL) { | |
| 544 buffer[sig-1] = '?'; | |
| 545 } else { | |
| 546 buffer[sig-1] = rc == 0 ? '0' : '1'; | |
| 547 } | |
| 548 } | |
| 549 buffer[NUM_IMPORTANT_SIGS] = 0; | |
| 550 return buffer; | |
| 551 } | |
| 552 | |
| 553 // Prints one-line description of a signal set. | |
| 554 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) { | |
| 555 char buf[NUM_IMPORTANT_SIGS + 1]; | |
| 556 os::Posix::describe_signal_set_short(set, buf, sizeof(buf)); | |
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557 st->print("%s", buf); |
| 14410 | 558 } |
| 559 | |
| 560 // Writes one-line description of a combination of sigaction.sa_flags into a user | |
| 561 // provided buffer. Returns that buffer. | |
| 562 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) { | |
| 563 char* p = buffer; | |
| 564 size_t remaining = size; | |
| 565 bool first = true; | |
| 566 int idx = 0; | |
| 567 | |
| 568 assert(buffer, "invalid argument"); | |
| 569 | |
| 570 if (size == 0) { | |
| 571 return buffer; | |
| 572 } | |
| 573 | |
| 574 strncpy(buffer, "none", size); | |
| 575 | |
| 576 const struct { | |
| 577 int i; | |
| 578 const char* s; | |
| 579 } flaginfo [] = { | |
| 580 { SA_NOCLDSTOP, "SA_NOCLDSTOP" }, | |
| 581 { SA_ONSTACK, "SA_ONSTACK" }, | |
| 582 { SA_RESETHAND, "SA_RESETHAND" }, | |
| 583 { SA_RESTART, "SA_RESTART" }, | |
| 584 { SA_SIGINFO, "SA_SIGINFO" }, | |
| 585 { SA_NOCLDWAIT, "SA_NOCLDWAIT" }, | |
| 586 { SA_NODEFER, "SA_NODEFER" }, | |
| 587 #ifdef AIX | |
| 588 { SA_ONSTACK, "SA_ONSTACK" }, | |
| 589 { SA_OLDSTYLE, "SA_OLDSTYLE" }, | |
| 590 #endif | |
| 591 { 0, NULL } | |
| 592 }; | |
| 593 | |
| 594 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) { | |
| 595 if (flags & flaginfo[idx].i) { | |
| 596 if (first) { | |
| 597 jio_snprintf(p, remaining, "%s", flaginfo[idx].s); | |
| 598 first = false; | |
| 599 } else { | |
| 600 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s); | |
| 601 } | |
| 602 const size_t len = strlen(p); | |
| 603 p += len; | |
| 604 remaining -= len; | |
| 605 } | |
| 606 } | |
| 607 | |
| 608 buffer[size - 1] = '\0'; | |
| 609 | |
| 610 return buffer; | |
| 611 } | |
| 612 | |
| 613 // Prints one-line description of a combination of sigaction.sa_flags. | |
| 614 void os::Posix::print_sa_flags(outputStream* st, int flags) { | |
| 615 char buffer[0x100]; | |
| 616 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer)); | |
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617 st->print("%s", buffer); |
| 14410 | 618 } |
| 619 | |
| 620 // Helper function for os::Posix::print_siginfo_...(): | |
| 621 // return a textual description for signal code. | |
| 622 struct enum_sigcode_desc_t { | |
| 623 const char* s_name; | |
| 624 const char* s_desc; | |
| 625 }; | |
| 626 | |
| 627 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) { | |
| 628 | |
| 629 const struct { | |
| 630 int sig; int code; const char* s_code; const char* s_desc; | |
| 631 } t1 [] = { | |
| 632 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." }, | |
| 633 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." }, | |
| 634 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." }, | |
| 635 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." }, | |
| 636 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." }, | |
| 637 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." }, | |
| 638 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." }, | |
| 639 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." }, | |
| 640 #if defined(IA64) && defined(LINUX) | |
| 641 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" }, | |
| 642 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" }, | |
| 643 #endif | |
| 644 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." }, | |
| 645 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." }, | |
| 646 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." }, | |
| 647 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." }, | |
| 648 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." }, | |
| 649 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." }, | |
| 650 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." }, | |
| 651 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." }, | |
| 652 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." }, | |
| 653 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." }, | |
| 654 #ifdef AIX | |
| 655 // no explanation found what keyerr would be | |
| 656 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" }, | |
| 657 #endif | |
| 658 #if defined(IA64) && !defined(AIX) | |
| 659 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" }, | |
| 660 #endif | |
| 661 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." }, | |
| 662 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." }, | |
| 663 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." }, | |
| 664 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." }, | |
| 665 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." }, | |
| 666 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." }, | |
| 667 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." }, | |
| 668 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." }, | |
| 669 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." }, | |
| 670 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." }, | |
| 671 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." }, | |
| 672 #ifdef SIGPOLL | |
| 673 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." }, | |
| 674 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." }, | |
| 675 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." }, | |
| 676 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." }, | |
| 677 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" }, | |
| 678 #endif | |
| 679 { -1, -1, NULL, NULL } | |
| 680 }; | |
| 681 | |
| 682 // Codes valid in any signal context. | |
| 683 const struct { | |
| 684 int code; const char* s_code; const char* s_desc; | |
| 685 } t2 [] = { | |
| 686 { SI_USER, "SI_USER", "Signal sent by kill()." }, | |
| 687 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." }, | |
| 688 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." }, | |
| 689 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." }, | |
| 690 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." }, | |
| 691 // Linux specific | |
| 692 #ifdef SI_TKILL | |
| 693 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" }, | |
| 694 #endif | |
| 695 #ifdef SI_DETHREAD | |
| 696 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" }, | |
| 697 #endif | |
| 698 #ifdef SI_KERNEL | |
| 699 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." }, | |
| 700 #endif | |
| 701 #ifdef SI_SIGIO | |
| 702 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" }, | |
| 703 #endif | |
| 704 | |
| 705 #ifdef AIX | |
| 706 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" }, | |
| 707 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" }, | |
| 708 #endif | |
| 709 | |
| 710 #ifdef __sun | |
| 711 { SI_NOINFO, "SI_NOINFO", "No signal information" }, | |
| 712 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" }, | |
| 713 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" }, | |
| 714 #endif | |
| 715 | |
| 716 { -1, NULL, NULL } | |
| 717 }; | |
| 718 | |
| 719 const char* s_code = NULL; | |
| 720 const char* s_desc = NULL; | |
| 721 | |
| 722 for (int i = 0; t1[i].sig != -1; i ++) { | |
| 723 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) { | |
| 724 s_code = t1[i].s_code; | |
| 725 s_desc = t1[i].s_desc; | |
| 726 break; | |
| 727 } | |
| 728 } | |
| 729 | |
| 730 if (s_code == NULL) { | |
| 731 for (int i = 0; t2[i].s_code != NULL; i ++) { | |
| 732 if (t2[i].code == si->si_code) { | |
| 733 s_code = t2[i].s_code; | |
| 734 s_desc = t2[i].s_desc; | |
| 735 } | |
| 736 } | |
| 737 } | |
| 738 | |
| 739 if (s_code == NULL) { | |
| 740 out->s_name = "unknown"; | |
| 741 out->s_desc = "unknown"; | |
| 742 return false; | |
| 743 } | |
| 744 | |
| 745 out->s_name = s_code; | |
| 746 out->s_desc = s_desc; | |
| 747 | |
| 748 return true; | |
| 749 } | |
| 750 | |
| 751 // A POSIX conform, platform-independend siginfo print routine. | |
| 752 // Short print out on one line. | |
| 753 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) { | |
| 754 char buf[20]; | |
| 755 os->print("siginfo: "); | |
| 756 | |
| 757 if (!si) { | |
| 758 os->print("<null>"); | |
| 759 return; | |
| 760 } | |
| 761 | |
| 762 // See print_siginfo_full() for details. | |
| 763 const int sig = si->si_signo; | |
| 764 | |
| 765 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf))); | |
| 766 | |
| 767 enum_sigcode_desc_t ed; | |
| 768 if (get_signal_code_description(si, &ed)) { | |
| 769 os->print(", si_code: %d (%s)", si->si_code, ed.s_name); | |
| 770 } else { | |
| 771 os->print(", si_code: %d (unknown)", si->si_code); | |
| 772 } | |
| 773 | |
| 774 if (si->si_errno) { | |
| 775 os->print(", si_errno: %d", si->si_errno); | |
| 776 } | |
| 777 | |
| 778 const int me = (int) ::getpid(); | |
| 779 const int pid = (int) si->si_pid; | |
| 780 | |
| 781 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) { | |
| 782 if (IS_VALID_PID(pid) && pid != me) { | |
| 783 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid); | |
| 784 } | |
| 785 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || | |
| 786 sig == SIGTRAP || sig == SIGFPE) { | |
| 787 os->print(", si_addr: " PTR_FORMAT, si->si_addr); | |
| 788 #ifdef SIGPOLL | |
| 789 } else if (sig == SIGPOLL) { | |
| 790 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band); | |
| 791 #endif | |
| 792 } else if (sig == SIGCHLD) { | |
| 793 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status); | |
| 794 } | |
| 795 } | |
| 796 | |
| 11151 | 797 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { |
| 798 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); | |
| 799 } | |
| 800 | |
| 801 /* | |
| 802 * See the caveats for this class in os_posix.hpp | |
| 803 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this | |
| 804 * method and returns false. If none of the signals are raised, returns true. | |
| 805 * The callback is supposed to provide the method that should be protected. | |
| 806 */ | |
| 807 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { | |
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808 sigset_t saved_sig_mask; |
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809 |
| 11151 | 810 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); |
| 811 assert(!WatcherThread::watcher_thread()->has_crash_protection(), | |
| 812 "crash_protection already set?"); | |
| 813 | |
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814 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask |
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815 // since on at least some systems (OS X) siglongjmp will restore the mask |
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816 // for the process, not the thread |
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817 pthread_sigmask(0, NULL, &saved_sig_mask); |
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818 if (sigsetjmp(_jmpbuf, 0) == 0) { |
| 11151 | 819 // make sure we can see in the signal handler that we have crash protection |
| 820 // installed | |
| 821 WatcherThread::watcher_thread()->set_crash_protection(this); | |
| 822 cb.call(); | |
| 823 // and clear the crash protection | |
| 824 WatcherThread::watcher_thread()->set_crash_protection(NULL); | |
| 825 return true; | |
| 826 } | |
| 827 // this happens when we siglongjmp() back | |
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828 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); |
| 11151 | 829 WatcherThread::watcher_thread()->set_crash_protection(NULL); |
| 830 return false; | |
| 831 } | |
| 832 | |
| 833 void os::WatcherThreadCrashProtection::restore() { | |
| 834 assert(WatcherThread::watcher_thread()->has_crash_protection(), | |
| 835 "must have crash protection"); | |
| 836 | |
| 837 siglongjmp(_jmpbuf, 1); | |
| 838 } | |
| 839 | |
| 840 void os::WatcherThreadCrashProtection::check_crash_protection(int sig, | |
| 841 Thread* thread) { | |
| 842 | |
| 843 if (thread != NULL && | |
| 844 thread->is_Watcher_thread() && | |
| 845 WatcherThread::watcher_thread()->has_crash_protection()) { | |
| 846 | |
| 847 if (sig == SIGSEGV || sig == SIGBUS) { | |
| 848 WatcherThread::watcher_thread()->crash_protection()->restore(); | |
| 849 } | |
| 850 } | |
| 851 } |