AudioServer: Port to socket takeover

Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/bd559389858
Pull-request: https://github.com/SerenityOS/serenity/pull/827

Base/etc/SystemServer.ini

@@ -21,6 +21,7 @@ KeepAlive=1
 User=anon
 
 [AudioServer]
+Socket=/tmp/portal/audio
 Priority=high
 KeepAlive=1
 User=anon

Libraries/LibAudio/AClientConnection.cpp

@@ -3,7 +3,7 @@
 #include <SharedBuffer.h>
 
 AClientConnection::AClientConnection()
-    : ConnectionNG(*this, "/tmp/asportal")
+    : ConnectionNG(*this, "/tmp/portal/audio")
 {
 }
 

Servers/AudioServer/ASEventLoop.cpp

@@ -7,8 +7,8 @@
 ASEventLoop::ASEventLoop()
     : m_server(CLocalServer::construct())
 {
-    unlink("/tmp/asportal");
+    bool ok = m_server->take_over_from_system_server();
-    m_server->listen("/tmp/asportal");
+    ASSERT(ok);
     m_server->on_ready_to_accept = [this] {
         auto client_socket = m_server->accept();
         if (!client_socket) {