LibCore: Port SystemServerTakeover.cpp to Windows

Libraries/LibCore/SystemServerTakeover.cpp

@@ -1,10 +1,12 @@
 /*
  * Copyright (c) 2022, sin-ack <sin-ack@protonmail.com>
+ * Copyright (c) 2024, stasoid <stasoid@yahoo.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include "SystemServerTakeover.h"
+#include <LibCore/Environment.h>
 #include <LibCore/Socket.h>
 #include <LibCore/System.h>
 
@@ -17,23 +19,27 @@ static void parse_sockets_from_system_server()
 {
     VERIFY(!s_overtaken_sockets_parsed);
 
-    constexpr auto socket_takeover = "SOCKET_TAKEOVER";
-    char const* sockets = getenv(socket_takeover);
-    if (!sockets) {
+    constexpr auto socket_takeover = "SOCKET_TAKEOVER"sv;
+    auto sockets = Environment::get(socket_takeover);
+    if (!sockets.has_value()) {
         s_overtaken_sockets_parsed = true;
         return;
     }
 
-    for (auto const socket : StringView { sockets, strlen(sockets) }.split_view(';')) {
+    for (auto socket : sockets->split_view(';')) {
         auto params = socket.split_view(':');
         VERIFY(params.size() == 2);
+#ifndef AK_OS_WINDOWS
         s_overtaken_sockets.set(params[0].to_byte_string(), params[1].to_number<int>().value());
+#else
+        s_overtaken_sockets.set(params[0].to_byte_string(), handle_to_fd(params[1].to_number<intptr_t>().value(), System::SocketHandle));
+#endif
     }
 
     s_overtaken_sockets_parsed = true;
     // We wouldn't want our children to think we're passing
     // them a socket either, so unset the env variable.
-    unsetenv(socket_takeover);
+    MUST(Environment::unset(socket_takeover));
 }
 
 ErrorOr<NonnullOwnPtr<Core::LocalSocket>> take_over_socket_from_system_server(ByteString const& socket_path)
@@ -54,10 +60,8 @@ ErrorOr<NonnullOwnPtr<Core::LocalSocket>> take_over_socket_from_system_server(By
     }
 
     // Sanity check: it has to be a socket.
-    auto stat = TRY(Core::System::fstat(fd));
-
-    if (!S_ISSOCK(stat.st_mode))
-        return Error::from_string_literal("The fd we got from SystemServer is not a socket");
+    if (!System::is_socket(fd))
+        return Error::from_string_literal("The fd or handle we got from SystemServer is not a socket");
 
     auto socket = TRY(Core::LocalSocket::adopt_fd(fd));
     // It had to be !CLOEXEC for obvious reasons, but we