Add a base socket (bsd) services implementation

This stubs enough to pass SMO's socket init.

app/CMakeLists.txt

@@ -122,6 +122,7 @@ add_library(skyline SHARED
         ${source_DIR}/skyline/services/nifm/IStaticService.cpp
         ${source_DIR}/skyline/services/nifm/IGeneralService.cpp
         ${source_DIR}/skyline/services/nifm/IRequest.cpp
+        ${source_DIR}/skyline/services/socket/bsd/IClient.cpp
         ${source_DIR}/skyline/vfs/partition_filesystem.cpp
         ${source_DIR}/skyline/vfs/rom_filesystem.cpp
         ${source_DIR}/skyline/vfs/os_backing.cpp

app/src/main/cpp/skyline/services/base_service.h

@@ -78,6 +78,7 @@ namespace skyline::service {
         nifm_IStaticService,
         nifm_IGeneralService,
         nifm_IRequest,
+        socket_IClient,
     };
 
     /**
@@ -115,6 +116,7 @@ namespace skyline::service {
         {"friend:u", Service::friends_IServiceCreator},
         {"nfp:user", Service::nfp_IUserManager},
         {"nifm:u", Service::nifm_IStaticService},
+        {"bsd:u", Service::socket_IClient},
     };
 
     class ServiceManager;

app/src/main/cpp/skyline/services/serviceman.cpp

@@ -24,6 +24,7 @@
 #include "friends/IServiceCreator.h"
 #include "nfp/IUserManager.h"
 #include "nifm/IStaticService.h"
+#include "socket/bsd/IClient.h"
 #include "serviceman.h"
 
 namespace skyline::service {
@@ -102,6 +103,9 @@ namespace skyline::service {
             case Service::nifm_IStaticService:
                 serviceObj = std::make_shared<nifm::IStaticService>(state, *this);
                 break;
+            case Service::socket_IClient:
+                serviceObj = std::make_shared<socket::IClient>(state, *this);
+                break;
             default:
                 throw exception("CreateService called on missing object, type: {}", serviceType);
         }

app/src/main/cpp/skyline/services/socket/bsd/IClient.cpp

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+
+#include "IClient.h"
+
+namespace skyline::service::socket {
+    IClient::IClient(const DeviceState &state, ServiceManager &manager) : BaseService(state, manager, Service::socket_IClient, "socket:IClient", {
+        {0x0, SFUNC(IClient::RegisterClient)},
+        {0x1, SFUNC(IClient::StartMonitoring)},
+    }) {}
+
+    void IClient::RegisterClient(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response) {
+        response.Push<u32>(0);
+    }
+
+    void IClient::StartMonitoring(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response) {}
+}

app/src/main/cpp/skyline/services/socket/bsd/IClient.h

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+
+#pragma once
+
+#include <services/base_service.h>
+#include <services/serviceman.h>
+
+namespace skyline::service::socket {
+    /**
+     * @brief IClient or bsd:u is used by applications create network sockets (https://switchbrew.org/wiki/Sockets_services#bsd:u.2C_bsd:s)
+     */
+    class IClient : public BaseService {
+      public:
+        IClient(const DeviceState &state, ServiceManager &manager);
+
+        /**
+         * @brief This initializes a socket client with the given parameters (https://switchbrew.org/wiki/Sockets_services#Initialize)
+         */
+        void RegisterClient(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response);
+
+        /**
+         * @brief This starts the monitoring of the socket
+         */
+        void StartMonitoring(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response);
+    };
+}