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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Service.h"
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/Event.h>
#include <LibCore/EventLoop.h>
#include <LibCore/File.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
String g_boot_mode = "graphical";
static void sigchld_handler(int)
{
int status = 0;
pid_t pid = waitpid(-1, &status, WNOHANG);
if (!pid)
return;
dbg() << "Reaped child with pid " << pid << ", exist status " << status;
Service* service = Service::find_by_pid(pid);
if (service == nullptr) {
// This can happen for multi-instance services.
return;
}
// Call service->did_exit(status) some time soon.
// We wouldn't want to run the complex logic, such
// as possibly spawning the service again, from the
// signal handler, so defer it.
Core::EventLoop::main().post_event(*service, make<Core::DeferredInvocationEvent>([=](auto&) {
service->did_exit(status);
}));
Core::EventLoop::wake();
}
static void parse_boot_mode()
{
auto f = Core::File::construct("/proc/cmdline");
if (!f->open(Core::IODevice::ReadOnly)) {
dbg() << "Failed to read command line: " << f->error_string();
return;
}
const String cmdline = String::copy(f->read_all(), Chomp);
dbg() << "Read command line: " << cmdline;
for (auto& part : cmdline.split_view(' ')) {
auto pair = part.split_view('=', 2);
if (pair.size() == 2 && pair[0] == "boot_mode")
g_boot_mode = pair[1];
}
dbg() << "Booting in " << g_boot_mode << " mode";
}
static void mount_all_filesystems()
{
dbg() << "Spawning mount -a to mount all filesystems.";
pid_t pid = fork();
if (pid < 0) {
perror("fork");
ASSERT_NOT_REACHED();
} else if (pid == 0) {
execl("/bin/mount", "mount", "-a", nullptr);
perror("exec");
ASSERT_NOT_REACHED();
} else {
wait(nullptr);
}
}
int main(int, char**)
{
if (pledge("stdio proc exec tty accept unix rpath wpath cpath chown fattr id sigaction", nullptr) < 0) {
perror("pledge");
return 1;
}
mount_all_filesystems();
parse_boot_mode();
struct sigaction sa = {
.sa_handler = sigchld_handler,
.sa_mask = 0,
.sa_flags = SA_RESTART
};
sigaction(SIGCHLD, &sa, nullptr);
Core::EventLoop event_loop;
// Read our config and instantiate services.
// This takes care of setting up sockets.
NonnullRefPtrVector<Service> services;
auto config = Core::ConfigFile::get_for_system("SystemServer");
for (auto name : config->groups()) {
auto service = Service::construct(*config, name);
if (service->is_enabled())
services.append(service);
}
// After we've set them all up, activate them!
dbg() << "Activating " << services.size() << " services...";
for (auto& service : services)
service.activate();
return event_loop.exec();
}
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