mirror of
https://github.com/fergalmoran/ladybird.git
synced 2025-12-30 13:19:47 +00:00
d6174f9c79
We need to call waitpid until no more waitable children are available. This is necessary because SIGCHLD signals may coalesce into one when multiple children terminate almost simultaneously. This fixes random zombie processes sticking around after e.g. closing Browser. Also, switch to EventLoop's asynchronous signal handling mechanism, which allows more complex operations in the signal handler.
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
|
|
* 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)
|
|
{
|
|
for (;;) {
|
|
int status = 0;
|
|
pid_t pid = waitpid(-1, &status, WNOHANG);
|
|
if (pid < 0) {
|
|
perror("waitpid");
|
|
break;
|
|
}
|
|
if (pid == 0)
|
|
break;
|
|
|
|
#ifdef SYSTEMSERVER_DEBUG
|
|
dbg() << "Reaped child with pid " << pid << ", exit status " << status;
|
|
#endif
|
|
|
|
Service* service = Service::find_by_pid(pid);
|
|
if (service == nullptr) {
|
|
// This can happen for multi-instance services.
|
|
continue;
|
|
}
|
|
|
|
service->did_exit(status);
|
|
}
|
|
}
|
|
|
|
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();
|
|
|
|
Core::EventLoop event_loop;
|
|
|
|
event_loop.register_signal(SIGCHLD, sigchld_handler);
|
|
|
|
// 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();
|
|
}
|