| //===-- Implementation of a class for mapping signals to strings ----------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "signal_to_string.h" |
| #include "platform_signals.h" |
| |
| #include "src/__support/CPP/span.h" |
| #include "src/__support/CPP/string_view.h" |
| #include "src/__support/CPP/stringstream.h" |
| #include "src/__support/StringUtil/message_mapper.h" |
| #include "src/__support/integer_to_string.h" |
| #include "src/__support/macros/attributes.h" |
| |
| #include <signal.h> |
| #include <stddef.h> |
| |
| namespace __llvm_libc { |
| namespace internal { |
| |
| constexpr size_t max_buff_size() { |
| constexpr size_t base_str_len = sizeof("Real-time signal"); |
| constexpr size_t max_num_len = |
| __llvm_libc::IntegerToString::dec_bufsize<int>(); |
| // the buffer should be able to hold "Real-time signal" + ' ' + num_str |
| return (base_str_len + 1 + max_num_len) * sizeof(char); |
| } |
| |
| // This is to hold signal strings that have to be custom built. It may be |
| // rewritten on every call to strsignal (or other signal to string function). |
| constexpr size_t SIG_BUFFER_SIZE = max_buff_size(); |
| LIBC_THREAD_LOCAL char signal_buffer[SIG_BUFFER_SIZE]; |
| |
| constexpr size_t TOTAL_STR_LEN = total_str_len(PLATFORM_SIGNALS); |
| |
| constexpr size_t SIG_ARRAY_SIZE = max_key_val(PLATFORM_SIGNALS) + 1; |
| |
| constexpr MessageMapper<SIG_ARRAY_SIZE, TOTAL_STR_LEN> |
| signal_mapper(PLATFORM_SIGNALS); |
| |
| cpp::string_view build_signal_string(int sig_num, cpp::span<char> buffer) { |
| cpp::string_view base_str; |
| if (sig_num >= SIGRTMIN && sig_num <= SIGRTMAX) { |
| base_str = cpp::string_view("Real-time signal"); |
| sig_num -= SIGRTMIN; |
| } else { |
| base_str = cpp::string_view("Unknown signal"); |
| } |
| |
| // if the buffer can't hold "Unknown signal" + ' ' + num_str, then just |
| // return "Unknown signal". |
| if (buffer.size() < |
| (base_str.size() + 1 + IntegerToString::dec_bufsize<int>())) |
| return base_str; |
| |
| cpp::StringStream buffer_stream( |
| {const_cast<char *>(buffer.data()), buffer.size()}); |
| buffer_stream << base_str << ' ' << sig_num << '\0'; |
| return buffer_stream.str(); |
| } |
| |
| } // namespace internal |
| |
| cpp::string_view get_signal_string(int sig_num) { |
| return get_signal_string( |
| sig_num, {internal::signal_buffer, internal::SIG_BUFFER_SIZE}); |
| } |
| |
| cpp::string_view get_signal_string(int sig_num, cpp::span<char> buffer) { |
| auto opt_str = internal::signal_mapper.get_str(sig_num); |
| if (opt_str) |
| return *opt_str; |
| else |
| return internal::build_signal_string(sig_num, buffer); |
| } |
| |
| } // namespace __llvm_libc |