a0f6932ebe
By default, if the parent of a process dies, the process gets SIGHUP and is supposed to shut down. This however doesn't work for MPD, because MPD redefines SIGHUP with a different meaning (like most daemons do). To work around this, we configure the kernel to send SIGTERM instead of SIGHUP. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1706
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "SignalHandlers.hxx"
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#include "Instance.hxx"
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#include "event/SignalMonitor.hxx"
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#ifndef _WIN32
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#include "Log.hxx"
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#include "LogInit.hxx"
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#include "system/Error.hxx"
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#include "util/Domain.hxx"
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#include <csignal>
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#ifdef __linux__
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#include <sys/prctl.h>
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#endif
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static constexpr Domain signal_handlers_domain("signal_handlers");
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static void
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HandleShutdownSignal(void *ctx) noexcept
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{
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auto &loop = *(EventLoop *)ctx;
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loop.Break();
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}
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static void
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x_sigaction(int signum, const struct sigaction *act)
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{
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if (sigaction(signum, act, nullptr) < 0)
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throw MakeErrno("sigaction() failed");
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}
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static void
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handle_reload_event(void *ctx) noexcept
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{
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auto &instance = *(Instance *)ctx;
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LogDebug(signal_handlers_domain, "got SIGHUP, reopening log files and flushing caches");
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cycle_log_files();
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instance.FlushCaches();
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}
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#endif
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void
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SignalHandlersInit(Instance &instance, bool daemon)
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{
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auto &loop = instance.event_loop;
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SignalMonitorInit(loop);
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#ifndef _WIN32
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struct sigaction sa;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = SIG_IGN;
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x_sigaction(SIGPIPE, &sa);
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SignalMonitorRegister(SIGINT, {&loop, HandleShutdownSignal});
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SignalMonitorRegister(SIGTERM, {&loop, HandleShutdownSignal});
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SignalMonitorRegister(SIGHUP, {&instance, handle_reload_event});
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#endif
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if (!daemon) {
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#ifdef __linux__
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/* if MPD was not daemonized, shut it down when the
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parent process dies */
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prctl(PR_SET_PDEATHSIG, SIGTERM);
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#endif
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}
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}
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void
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SignalHandlersFinish() noexcept
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{
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SignalMonitorFinish();
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}
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