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701994bfd1
You can now ask SystemServer to not only listen for connections on the socket, but to actually accept them, and to spawn an instance of the service for each client connection. In this case, it's the accepted, not listening, socket that the service processes will receive using socket takeover. This mode obviously requires the service to be a multi-instance service.
101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/RefPtr.h>
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#include <AK/String.h>
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#include <LibCore/ElapsedTimer.h>
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#include <LibCore/Notifier.h>
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#include <LibCore/Object.h>
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class Service final : public Core::Object {
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C_OBJECT(Service)
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public:
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bool is_enabled() const;
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void activate();
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void did_exit(int exit_code);
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static Service* find_by_pid(pid_t);
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void save_to(AK::JsonObject&) override;
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private:
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Service(const Core::ConfigFile&, const StringView& name);
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void spawn(int socket_fd = -1);
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// Path to the executable. By default this is /bin/{m_name}.
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String m_executable_path;
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// Extra arguments, starting from argv[1], to pass when exec'ing.
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Vector<String> m_extra_arguments;
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// File path to open as stdio fds.
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String m_stdio_file_path;
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int m_priority { 1 };
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// Whether we should re-launch it if it exits.
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bool m_keep_alive { false };
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// Path to the socket to create and listen on on behalf of this service.
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String m_socket_path;
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// File system permissions for the socket.
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mode_t m_socket_permissions { 0 };
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// Whether we should accept connections on the socket and pass the accepted
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// (and not listening) socket to the service. This requires a multi-instance
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// service.
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bool m_accept_socket_connections { false };
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// Whether we should only spawn this service once somebody connects to the socket.
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bool m_lazy;
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// The name of the user we should run this service as.
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String m_user;
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uid_t m_uid { 0 };
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gid_t m_gid { 0 };
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Vector<gid_t> m_extra_gids;
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// The working directory in which to spawn the service.
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String m_working_directory;
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// Boot modes to run this service in. By default, this is the graphical mode.
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Vector<String> m_boot_modes;
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// Whether several instances of this service can run at once.
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bool m_multi_instance { false };
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// Environment variables to pass to the service.
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Vector<String> m_environment;
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// For single-instance services, PID of the running instance of this service.
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pid_t m_pid { -1 };
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// An open fd to the socket.
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int m_socket_fd { -1 };
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RefPtr<Core::Notifier> m_socket_notifier;
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// Timer since we last spawned the service.
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Core::ElapsedTimer m_run_timer;
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// How many times we have tried to restart this service, only counting those
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// times where it has exited unsuccessfully and too quickly.
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int m_restart_attempts { 0 };
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void resolve_user();
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void setup_socket();
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void setup_notifier();
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void handle_socket_connection();
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};
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