1 files changed, 10 insertions, 0 deletions

diff --git a/lib/libc/stdio/local.h b/lib/libc/stdio/local.h
index 2f95a58e9081..4f5242a917d1 100644
--- a/lib/libc/stdio/local.h
+++ b/lib/libc/stdio/local.h
@@ -39,6 +39,7 @@
  */
 
 #include <sys/types.h>	/* for off_t */
+#include <pthread.h>
 
 /*
  * Information local to this implementation of stdio,
@@ -67,6 +68,15 @@ extern int	__vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
 
 extern int	__sdidinit;
 
+
+/* hold a buncha junk that would grow the ABI */
+struct __sFILEX {
+	unsigned char	*_up;	/* saved _p when _p is doing ungetc data */
+	pthread_mutex_t	fl_mutex;	/* used for MT-safety */
+	pthread_t	fl_owner;	/* current owner */
+	int		fl_count;	/* recursive lock count */
+};
+
 /*
  * Return true iff the given FILE cannot be written now.
  */