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-rw-r--r--libio/libioP.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index 66afaa8968..afa46cc519 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -108,9 +108,14 @@
   (IO_validate_vtable                                                   \
    (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS)	\
 			     + (THIS)->_vtable_offset)))
+# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE)				\
+  (*(const struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS)	\
+				  + (THIS)->_vtable_offset) = (VTABLE))
 # define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
 #else
 # define _IO_JUMPS_FUNC(THIS) (IO_validate_vtable (_IO_JUMPS_FILE_plus (THIS)))
+# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE) \
+  (_IO_JUMPS_FILE_plus (THIS) = (VTABLE))
 # define _IO_vtable_offset(THIS) 0
 #endif
 #define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)