ntdll: Introduce wine_unix_call.

dlls/ntdll/ntdll.spec

@@ -1612,6 +1612,7 @@
 @ cdecl -syscall wine_server_handle_to_fd(long long ptr ptr)
 
 # Unix interface
+@ cdecl -syscall __wine_unix_call(int64 long ptr)
 @ cdecl __wine_set_unix_funcs(long ptr)
 @ cdecl __wine_init_unix_lib(long long ptr ptr)
 @ extern __wine_syscall_dispatcher

dlls/ntdll/unix/loader.c

@@ -1124,6 +1124,15 @@ static NTSTATUS CDECL init_unix_lib( void *module, DWORD reason, const void *ptr
 
 
 /***********************************************************************
+ *           __wine_unix_call
+ */
+NTSTATUS CDECL __wine_unix_call( UINT64 handle, unsigned int code, void *args )
+{
+    return ((unixlib_entry_t*)(UINT_PTR)handle)[code]( args );
+}
+
+
+/***********************************************************************
  *           load_so_dll
  */
 static NTSTATUS CDECL load_so_dll( UNICODE_STRING *nt_name, void **module )

include/winternl.h

@@ -4561,6 +4561,9 @@ static inline PLIST_ENTRY RemoveTailList(PLIST_ENTRY le)
 
 /* Wine internal functions */
 extern NTSTATUS CDECL __wine_init_unix_lib( HMODULE module, DWORD reason, const void *ptr_in, void *ptr_out );
+extern NTSTATUS CDECL __wine_unix_call( UINT64 handle, unsigned int code, void *args );
+
+typedef NTSTATUS (*unixlib_entry_t)( void *args );
 
 /* The thread information for 16-bit threads */
 /* NtCurrentTeb()->SubSystemTib points to this */