report_signal.cpp

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// Copyright (c) 2019-2025  Made to Order Software Corp.  All Rights Reserved
//
// https://snapwebsites.org/project/libexcept
// contact@m2osw.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 2 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, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
// self
//
#include    "libexcept/report_signal.h"
 
#include    "libexcept/stack_trace.h"
 
 
// C++
//
#include    <cstdint>
#include    <iostream>
#include    <memory>
 
 
// C
//
#include    <signal.h>
 
 
namespace libexcept
{
 
 
 
namespace
{
 
typedef struct sigaction                sigaction_t;
typedef std::shared_ptr<sigaction_t>    sigaction_ptr_t;
 
sigaction_ptr_t             g_signal_actions[64] = {};
 
void report_signal(
          int sig
        , siginfo_t * info
        , void * context)
{
    // unused parameters
    static_cast<void>(info);
    static_cast<void>(context);
 
    auto const trace(collect_stack_trace());
    for(auto const & stack_line : trace)
    {
        std::cerr
            << "report_signal():"
            << sig
            << ": backtrace="
            << stack_line
            << "\n";
    }
 
    // Abort
    //
    abort();
}
 
 
} // no name namespace
 
 
 
void init_report_signal()
{
    constexpr std::int64_t sigs(
              (1 << SIGHUP)
            | (1 << SIGILL)
            | (1 << SIGTRAP)
            | (1 << SIGBUS)
            | (1 << SIGFPE)
            | (1 << SIGSEGV)
        );
    for(size_t i(0); i < std::size(g_signal_actions); ++i)
    {
        if((sigs & (1L << i)) != 0)
        {
            sigaction_t action = sigaction_t();
            action.sa_sigaction = report_signal;
            action.sa_flags = SA_SIGINFO | SA_RESETHAND;
 
            g_signal_actions[i] = std::make_shared<sigaction_t>();
            sigaction(i, &action, g_signal_actions[i].get());
        }
    }
}
 
 
 
}
// namespace libexcept
// vim: ts=4 sw=4 et