Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
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103 lines
4.4 KiB
103 lines
4.4 KiB
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// Copyright 2018 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// This module allows the programmer to install a signal handler that |
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// dumps useful debugging information (like a stacktrace) on program |
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// failure. To use this functionality, call |
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// absl::InstallFailureSignalHandler() very early in your program, |
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// usually in the first few lines of main(): |
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// |
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// int main(int argc, char** argv) { |
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// absl::InitializeSymbolizer(argv[0]); |
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// absl::FailureSignalHandlerOptions options; |
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// absl::InstallFailureSignalHandler(options); |
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// DoSomethingInteresting(); |
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// return 0; |
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// } |
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#ifndef ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ |
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#define ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ |
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namespace absl { |
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// Options struct for absl::InstallFailureSignalHandler(). |
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struct FailureSignalHandlerOptions { |
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// If true, try to symbolize the stacktrace emitted on failure. |
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bool symbolize_stacktrace = true; |
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// If true, try to run signal handlers on an alternate stack (if |
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// supported on the given platform). This is useful in the case |
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// where the program crashes due to a stack overflow. By running on |
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// a alternate stack, the signal handler might be able to run even |
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// when the normal stack space has been exausted. The downside of |
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// using an alternate stack is that extra memory for the alternate |
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// stack needs to be pre-allocated. |
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bool use_alternate_stack = true; |
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// If positive, FailureSignalHandler() sets an alarm to be delivered |
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// to the program after this many seconds, which will immediately |
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// abort the program. This is useful in the potential case where |
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// FailureSignalHandler() itself is hung or deadlocked. |
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int alarm_on_failure_secs = 3; |
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// If false, after absl::FailureSignalHandler() runs, the signal is |
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// raised to the default handler for that signal (which normally |
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// terminates the program). |
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// |
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// If true, after absl::FailureSignalHandler() runs, it will call |
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// the previously registered signal handler for the signal that was |
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// received (if one was registered). This can be used to chain |
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// signal handlers. |
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// |
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// IMPORTANT: If true, the chained fatal signal handlers must not |
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// try to recover from the fatal signal. Instead, they should |
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// terminate the program via some mechanism, like raising the |
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// default handler for the signal, or by calling _exit(). |
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// absl::FailureSignalHandler() may put parts of the Abseil |
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// library into a state that cannot be recovered from. |
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bool call_previous_handler = false; |
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// If not null, this function may be called with a std::string argument |
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// containing failure data. This function is used as a hook to write |
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// the failure data to a secondary location, for instance, to a log |
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// file. This function may also be called with a null data |
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// argument. This is a hint that this is a good time to flush any |
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// buffered data before the program may be terminated. Consider |
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// flushing any buffered data in all calls to this function. |
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// |
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// Since this function runs in a signal handler, it should be |
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// async-signal-safe if possible. |
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// See http://man7.org/linux/man-pages/man7/signal-safety.7.html |
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void (*writerfn)(const char*) = nullptr; |
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}; |
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// Installs a signal handler for the common failure signals SIGSEGV, |
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// SIGILL, SIGFPE, SIGABRT, SIGTERM, SIGBUG, and SIGTRAP (if they |
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// exist on the given platform). The signal handler dumps program |
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// failure data in a unspecified format to stderr. The data dumped by |
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// the signal handler includes information that may be useful in |
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// debugging the failure. This may include the program counter, a |
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// stacktrace, and register information on some systems. Do not rely |
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// on the exact format of the output; it is subject to change. |
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void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options); |
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namespace debugging_internal { |
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const char* FailureSignalToString(int signo); |
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} // namespace debugging_internal |
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} // namespace absl |
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#endif // ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
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