1 //===-- UnixSignals.cpp -----------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "lldb/Target/UnixSignals.h" 11 #include "Plugins/Process/Utility/FreeBSDSignals.h" 12 #include "Plugins/Process/Utility/LinuxSignals.h" 13 #include "Plugins/Process/Utility/MipsLinuxSignals.h" 14 #include "Plugins/Process/Utility/NetBSDSignals.h" 15 #include "lldb/Host/StringConvert.h" 16 #include "lldb/Utility/ArchSpec.h" 17 18 using namespace lldb_private; 19 20 UnixSignals::Signal::Signal(const char *name, bool default_suppress, 21 bool default_stop, bool default_notify, 22 const char *description, const char *alias) 23 : m_name(name), m_alias(alias), m_description(), 24 m_suppress(default_suppress), m_stop(default_stop), 25 m_notify(default_notify) { 26 if (description) 27 m_description.assign(description); 28 } 29 30 lldb::UnixSignalsSP UnixSignals::Create(const ArchSpec &arch) { 31 const auto &triple = arch.GetTriple(); 32 switch (triple.getOS()) { 33 case llvm::Triple::Linux: { 34 switch (triple.getArch()) { 35 case llvm::Triple::mips: 36 case llvm::Triple::mipsel: 37 case llvm::Triple::mips64: 38 case llvm::Triple::mips64el: 39 return std::make_shared<MipsLinuxSignals>(); 40 default: 41 return std::make_shared<LinuxSignals>(); 42 } 43 } 44 case llvm::Triple::FreeBSD: 45 case llvm::Triple::OpenBSD: 46 return std::make_shared<FreeBSDSignals>(); 47 case llvm::Triple::NetBSD: 48 return std::make_shared<NetBSDSignals>(); 49 default: 50 return std::make_shared<UnixSignals>(); 51 } 52 } 53 54 //---------------------------------------------------------------------- 55 // UnixSignals constructor 56 //---------------------------------------------------------------------- 57 UnixSignals::UnixSignals() { Reset(); } 58 59 UnixSignals::UnixSignals(const UnixSignals &rhs) : m_signals(rhs.m_signals) {} 60 61 UnixSignals::~UnixSignals() = default; 62 63 void UnixSignals::Reset() { 64 // This builds one standard set of Unix Signals. If yours aren't quite in 65 // this order, you can either subclass this class, and use Add & Remove to 66 // change them 67 // or you can subclass and build them afresh in your constructor; 68 // 69 // Note: the signals below are the Darwin signals. Do not change these! 70 m_signals.clear(); 71 // SIGNO NAME SUPPRESS STOP NOTIFY DESCRIPTION 72 // ====== ============ ======== ====== ====== 73 // =================================================== 74 AddSignal(1, "SIGHUP", false, true, true, "hangup"); 75 AddSignal(2, "SIGINT", true, true, true, "interrupt"); 76 AddSignal(3, "SIGQUIT", false, true, true, "quit"); 77 AddSignal(4, "SIGILL", false, true, true, "illegal instruction"); 78 AddSignal(5, "SIGTRAP", true, true, true, 79 "trace trap (not reset when caught)"); 80 AddSignal(6, "SIGABRT", false, true, true, "abort()"); 81 AddSignal(7, "SIGEMT", false, true, true, "pollable event"); 82 AddSignal(8, "SIGFPE", false, true, true, "floating point exception"); 83 AddSignal(9, "SIGKILL", false, true, true, "kill"); 84 AddSignal(10, "SIGBUS", false, true, true, "bus error"); 85 AddSignal(11, "SIGSEGV", false, true, true, "segmentation violation"); 86 AddSignal(12, "SIGSYS", false, true, true, "bad argument to system call"); 87 AddSignal(13, "SIGPIPE", false, false, false, 88 "write on a pipe with no one to read it"); 89 AddSignal(14, "SIGALRM", false, false, false, "alarm clock"); 90 AddSignal(15, "SIGTERM", false, true, true, 91 "software termination signal from kill"); 92 AddSignal(16, "SIGURG", false, false, false, 93 "urgent condition on IO channel"); 94 AddSignal(17, "SIGSTOP", true, true, true, 95 "sendable stop signal not from tty"); 96 AddSignal(18, "SIGTSTP", false, true, true, "stop signal from tty"); 97 AddSignal(19, "SIGCONT", false, true, true, "continue a stopped process"); 98 AddSignal(20, "SIGCHLD", false, false, false, 99 "to parent on child stop or exit"); 100 AddSignal(21, "SIGTTIN", false, true, true, 101 "to readers process group upon background tty read"); 102 AddSignal(22, "SIGTTOU", false, true, true, 103 "to readers process group upon background tty write"); 104 AddSignal(23, "SIGIO", false, false, false, "input/output possible signal"); 105 AddSignal(24, "SIGXCPU", false, true, true, "exceeded CPU time limit"); 106 AddSignal(25, "SIGXFSZ", false, true, true, "exceeded file size limit"); 107 AddSignal(26, "SIGVTALRM", false, false, false, "virtual time alarm"); 108 AddSignal(27, "SIGPROF", false, false, false, "profiling time alarm"); 109 AddSignal(28, "SIGWINCH", false, false, false, "window size changes"); 110 AddSignal(29, "SIGINFO", false, true, true, "information request"); 111 AddSignal(30, "SIGUSR1", false, true, true, "user defined signal 1"); 112 AddSignal(31, "SIGUSR2", false, true, true, "user defined signal 2"); 113 } 114 115 void UnixSignals::AddSignal(int signo, const char *name, bool default_suppress, 116 bool default_stop, bool default_notify, 117 const char *description, const char *alias) { 118 Signal new_signal(name, default_suppress, default_stop, default_notify, 119 description, alias); 120 m_signals.insert(std::make_pair(signo, new_signal)); 121 ++m_version; 122 } 123 124 void UnixSignals::RemoveSignal(int signo) { 125 collection::iterator pos = m_signals.find(signo); 126 if (pos != m_signals.end()) 127 m_signals.erase(pos); 128 ++m_version; 129 } 130 131 const char *UnixSignals::GetSignalAsCString(int signo) const { 132 collection::const_iterator pos = m_signals.find(signo); 133 if (pos == m_signals.end()) 134 return nullptr; 135 else 136 return pos->second.m_name.GetCString(); 137 } 138 139 bool UnixSignals::SignalIsValid(int32_t signo) const { 140 return m_signals.find(signo) != m_signals.end(); 141 } 142 143 ConstString UnixSignals::GetShortName(ConstString name) const { 144 if (name) { 145 const char *signame = name.AsCString(); 146 return ConstString(signame + 3); // Remove "SIG" from name 147 } 148 return name; 149 } 150 151 int32_t UnixSignals::GetSignalNumberFromName(const char *name) const { 152 ConstString const_name(name); 153 154 collection::const_iterator pos, end = m_signals.end(); 155 for (pos = m_signals.begin(); pos != end; pos++) { 156 if ((const_name == pos->second.m_name) || 157 (const_name == pos->second.m_alias) || 158 (const_name == GetShortName(pos->second.m_name)) || 159 (const_name == GetShortName(pos->second.m_alias))) 160 return pos->first; 161 } 162 163 const int32_t signo = 164 StringConvert::ToSInt32(name, LLDB_INVALID_SIGNAL_NUMBER, 0); 165 if (signo != LLDB_INVALID_SIGNAL_NUMBER) 166 return signo; 167 return LLDB_INVALID_SIGNAL_NUMBER; 168 } 169 170 int32_t UnixSignals::GetFirstSignalNumber() const { 171 if (m_signals.empty()) 172 return LLDB_INVALID_SIGNAL_NUMBER; 173 174 return (*m_signals.begin()).first; 175 } 176 177 int32_t UnixSignals::GetNextSignalNumber(int32_t current_signal) const { 178 collection::const_iterator pos = m_signals.find(current_signal); 179 collection::const_iterator end = m_signals.end(); 180 if (pos == end) 181 return LLDB_INVALID_SIGNAL_NUMBER; 182 else { 183 pos++; 184 if (pos == end) 185 return LLDB_INVALID_SIGNAL_NUMBER; 186 else 187 return pos->first; 188 } 189 } 190 191 const char *UnixSignals::GetSignalInfo(int32_t signo, bool &should_suppress, 192 bool &should_stop, 193 bool &should_notify) const { 194 collection::const_iterator pos = m_signals.find(signo); 195 if (pos == m_signals.end()) 196 return nullptr; 197 else { 198 const Signal &signal = pos->second; 199 should_suppress = signal.m_suppress; 200 should_stop = signal.m_stop; 201 should_notify = signal.m_notify; 202 return signal.m_name.AsCString(""); 203 } 204 } 205 206 bool UnixSignals::GetShouldSuppress(int signo) const { 207 collection::const_iterator pos = m_signals.find(signo); 208 if (pos != m_signals.end()) 209 return pos->second.m_suppress; 210 return false; 211 } 212 213 bool UnixSignals::SetShouldSuppress(int signo, bool value) { 214 collection::iterator pos = m_signals.find(signo); 215 if (pos != m_signals.end()) { 216 pos->second.m_suppress = value; 217 ++m_version; 218 return true; 219 } 220 return false; 221 } 222 223 bool UnixSignals::SetShouldSuppress(const char *signal_name, bool value) { 224 const int32_t signo = GetSignalNumberFromName(signal_name); 225 if (signo != LLDB_INVALID_SIGNAL_NUMBER) 226 return SetShouldSuppress(signo, value); 227 return false; 228 } 229 230 bool UnixSignals::GetShouldStop(int signo) const { 231 collection::const_iterator pos = m_signals.find(signo); 232 if (pos != m_signals.end()) 233 return pos->second.m_stop; 234 return false; 235 } 236 237 bool UnixSignals::SetShouldStop(int signo, bool value) { 238 collection::iterator pos = m_signals.find(signo); 239 if (pos != m_signals.end()) { 240 pos->second.m_stop = value; 241 ++m_version; 242 return true; 243 } 244 return false; 245 } 246 247 bool UnixSignals::SetShouldStop(const char *signal_name, bool value) { 248 const int32_t signo = GetSignalNumberFromName(signal_name); 249 if (signo != LLDB_INVALID_SIGNAL_NUMBER) 250 return SetShouldStop(signo, value); 251 return false; 252 } 253 254 bool UnixSignals::GetShouldNotify(int signo) const { 255 collection::const_iterator pos = m_signals.find(signo); 256 if (pos != m_signals.end()) 257 return pos->second.m_notify; 258 return false; 259 } 260 261 bool UnixSignals::SetShouldNotify(int signo, bool value) { 262 collection::iterator pos = m_signals.find(signo); 263 if (pos != m_signals.end()) { 264 pos->second.m_notify = value; 265 ++m_version; 266 return true; 267 } 268 return false; 269 } 270 271 bool UnixSignals::SetShouldNotify(const char *signal_name, bool value) { 272 const int32_t signo = GetSignalNumberFromName(signal_name); 273 if (signo != LLDB_INVALID_SIGNAL_NUMBER) 274 return SetShouldNotify(signo, value); 275 return false; 276 } 277 278 int32_t UnixSignals::GetNumSignals() const { return m_signals.size(); } 279 280 int32_t UnixSignals::GetSignalAtIndex(int32_t index) const { 281 if (index < 0 || m_signals.size() <= static_cast<size_t>(index)) 282 return LLDB_INVALID_SIGNAL_NUMBER; 283 auto it = m_signals.begin(); 284 std::advance(it, index); 285 return it->first; 286 } 287 288 uint64_t UnixSignals::GetVersion() const { return m_version; } 289 290 std::vector<int32_t> 291 UnixSignals::GetFilteredSignals(llvm::Optional<bool> should_suppress, 292 llvm::Optional<bool> should_stop, 293 llvm::Optional<bool> should_notify) { 294 std::vector<int32_t> result; 295 for (int32_t signo = GetFirstSignalNumber(); 296 signo != LLDB_INVALID_SIGNAL_NUMBER; 297 signo = GetNextSignalNumber(signo)) { 298 299 bool signal_suppress = false; 300 bool signal_stop = false; 301 bool signal_notify = false; 302 GetSignalInfo(signo, signal_suppress, signal_stop, signal_notify); 303 304 // If any of filtering conditions are not met, we move on to the next 305 // signal. 306 if (should_suppress.hasValue() && 307 signal_suppress != should_suppress.getValue()) 308 continue; 309 310 if (should_stop.hasValue() && signal_stop != should_stop.getValue()) 311 continue; 312 313 if (should_notify.hasValue() && signal_notify != should_notify.getValue()) 314 continue; 315 316 result.push_back(signo); 317 } 318 319 return result; 320 } 321