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SystemServer: Add Service::try_create to propagate errors

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This static method is used to propagate errors at the creation of the
object.
This commit is contained in:
Lucas CHOLLET 2022-06-08 18:29:08 +02:00 committed by Andreas Kling
parent dd3b65c762
commit 23fa6b1f7b
Notes: sideshowbarker 2024-07-17 17:49:11 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/23fa6b1f7b
Pull-request: https://github.com/SerenityOS/serenity/pull/14222
Reviewed-by: https://github.com/petelliott ✅
3 changed files with 25 additions and 20 deletions
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33
Userland/Services/SystemServer/Service.cpp
View File

@ -31,26 +31,24 @@ Service* Service::find_by_pid(pid_t pid)
return (*it).value;
}
void Service::setup_socket(SocketDescriptor& socket)
ErrorOr<void> Service::setup_socket(SocketDescriptor& socket)
{
VERIFY(socket.fd == -1);
MUST(Core::Directory::create(LexicalPath(socket.path).parent(), Core::Directory::CreateDirectories::Yes));
TRY(Core::Directory::create(LexicalPath(socket.path).parent(), Core::Directory::CreateDirectories::Yes));
// Note: we use SOCK_CLOEXEC here to make sure we don't leak every socket to
// all the clients. We'll make the one we do need to pass down !CLOEXEC later
// after forking off the process.
int socket_fd = Core::System::socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0).release_value_but_fixme_should_propagate_errors();
int const socket_fd = TRY(Core::System::socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0));
socket.fd = socket_fd;
if (m_account.has_value()) {
auto& account = m_account.value();
// FIXME: Propagate errors
MUST(Core::System::fchown(socket_fd, account.uid(), account.gid()));
TRY(Core::System::fchown(socket_fd, account.uid(), account.gid()));
}
// FIXME: Propagate errors
MUST(Core::System::fchmod(socket_fd, socket.permissions));
TRY(Core::System::fchmod(socket_fd, socket.permissions));
auto socket_address = Core::SocketAddress::local(socket.path);
auto un_optional = socket_address.to_sockaddr_un();
@ -60,16 +58,16 @@ void Service::setup_socket(SocketDescriptor& socket)
}
auto un = un_optional.value();
// FIXME: Propagate errors
MUST(Core::System::bind(socket_fd, (sockaddr const*)&un, sizeof(un)));
// FIXME: Propagate errors
MUST(Core::System::listen(socket_fd, 16));
TRY(Core::System::bind(socket_fd, (sockaddr const*)&un, sizeof(un)));
TRY(Core::System::listen(socket_fd, 16));
return {};
}
void Service::setup_sockets()
ErrorOr<void> Service::setup_sockets()
{
for (SocketDescriptor& socket : m_sockets)
setup_socket(socket);
TRY(setup_socket(socket));
return {};
}
void Service::setup_notifier()
@ -338,9 +336,14 @@ Service::Service(Core::ConfigFile const& config, StringView name)
VERIFY(!m_accept_socket_connections || (m_sockets.size() == 1 && m_lazy && m_multi_instance));
// MultiInstance doesn't work with KeepAlive.
VERIFY(!m_multi_instance || !m_keep_alive);
}
if (is_enabled())
setup_sockets();
ErrorOr<NonnullRefPtr<Service>> Service::try_create(Core::ConfigFile const& config, StringView name)
{
auto service = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Service(config, name)));
if (service->is_enabled())
TRY(service->setup_sockets());
return service;
}
void Service::save_to(JsonObject& json)

8
Userland/Services/SystemServer/Service.h
View File

@ -14,9 +14,11 @@
#include <LibCore/Object.h>
class Service final : public Core::Object {
C_OBJECT(Service)
C_OBJECT_ABSTRACT(Service)
public:
static ErrorOr<NonnullRefPtr<Service>> try_create(Core::ConfigFile const& config, StringView name);
bool is_enabled() const;
void activate();
void did_exit(int exit_code);
@ -83,8 +85,8 @@ private:
// times where it has exited unsuccessfully and too quickly.
int m_restart_attempts { 0 };
void setup_socket(SocketDescriptor&);
void setup_sockets();
ErrorOr<void> setup_socket(SocketDescriptor&);
ErrorOr<void> setup_sockets();
void setup_notifier();
void handle_socket_connection();
};

4
Userland/Services/SystemServer/main.cpp
View File

@ -487,8 +487,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto config = (user)
? TRY(Core::ConfigFile::open_for_app("SystemServer"))
: TRY(Core::ConfigFile::open_for_system("SystemServer"));
for (auto name : config->groups()) {
auto service = Service::construct(*config, name);
for (auto const& name : config->groups()) {
auto service = TRY(Service::try_create(*config, name));
if (service->is_enabled())
services.append(service);
}