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- // SuperTux
- // Copyright (C) 2020 A. Semphris <semphris@protonmail.com>
- //
- // This program is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with this program. If not, see <http://www.gnu.org/licenses/>.
- #include "supertux/error_handler.hpp"
- // execinfo.h as a built-in libc feature is exclusive to glibc as of 2020.
- // On FreeBSD and musl systems, an external libexecinfo is available, but
- // it has to be explicitly linked into the final executable.
- // This is a *libc* feature, not a compiler one; furthermore, it's possible
- // to verify its availability in CMakeLists.txt, if one is so inclined.
- #ifdef __GLIBC__
- #include <execinfo.h>
- #include <signal.h>
- #include <unistd.h>
- #endif
- bool ErrorHandler::m_handing_error = false;
- void
- ErrorHandler::set_handlers()
- {
- #ifdef __GLIBC__
- signal(SIGSEGV, handle_error);
- signal(SIGABRT, handle_error);
- #endif
- }
- [[ noreturn ]] void
- ErrorHandler::handle_error(int sig)
- {
- if (m_handing_error)
- {
- // Error happened again while handling another segfault. Abort now.
- close_program();
- }
- else
- {
- m_handing_error = true;
- // Do not use external stuff (like log_fatal) to limit the risk of causing
- // another error, which would restart the handler again.
- fprintf(stderr, "\nError: signal %d:\n", sig);
- print_stack_trace();
- close_program();
- }
- }
- void
- ErrorHandler::print_stack_trace()
- {
- #ifdef __GLIBC__
- void *array[127];
- size_t size;
- // Get void*'s for all entries on the stack.
- size = backtrace(array, 127);
- // Print out all the frames to stderr.
- backtrace_symbols_fd(array, static_cast<int>(size), STDERR_FILENO);
- #endif
- }
- [[ noreturn ]] void
- ErrorHandler::close_program()
- {
- exit(10);
- }
- /* EOF */
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