UserspaceEmulator: Implement beep syscall

DevTools/UserspaceEmulator/Emulator.cpp

@@ -507,6 +507,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
         return virt$readlink(arg1);
     case SC_allocate_tls:
         return virt$allocate_tls(arg1);
+    case SC_beep:
+        return virt$beep();
     default:
         reportln("\n=={}==  \033[31;1mUnimplemented syscall: {}\033[0m, {:p}", getpid(), Syscall::to_string((Syscall::Function)function), function);
         dump_backtrace();
@@ -1688,6 +1690,11 @@ u32 Emulator::virt$allocate_tls(size_t size)
     return tls_base;
 }
 
+int Emulator::virt$beep()
+{
+    return syscall(SC_beep);
+}
+
 bool Emulator::find_malloc_symbols(const MmapRegion& libc_text)
 {
     auto mapped_file = make<MappedFile>("/usr/lib/libc.so");

DevTools/UserspaceEmulator/Emulator.h

@@ -163,6 +163,7 @@ private:
     int virt$watch_file(FlatPtr, size_t);
     int virt$readlink(FlatPtr);
     u32 virt$allocate_tls(size_t);
+    int virt$beep();
 
     FlatPtr allocate_vm(size_t size, size_t alignment);
     bool find_malloc_symbols(const MmapRegion& libc_text);