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-rw-r--r--stdio-common/vfprintf.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/stdio-common/vfprintf.c b/stdio-common/vfprintf.c
index dc2983d264..1316adacbf 100644
--- a/stdio-common/vfprintf.c
+++ b/stdio-common/vfprintf.c
@@ -124,8 +124,6 @@ ssize_t __wprintf_pad __P ((FILE *, wchar_t pad, size_t n));
     }									      \
    while (0)
 # define UNBUFFERED_P(s) ((s)->__buffer == NULL)
-# define __flockfile(S) /* nothing */
-# define __funlockfile(S) /* nothing */
 #endif /* USE_IN_LIBIO */
 
 
@@ -155,6 +153,14 @@ ssize_t __wprintf_pad __P ((FILE *, wchar_t pad, size_t n));
 #endif
 
 
+#ifdef _LIBC_REENTRANT
+extern void __flockfile (FILE *);
+weak_extern (__flockfile);
+extern void __funlockfile (FILE *);
+weak_extern (__funlockfile);
+#endif
+
+
 /* Global variables.  */
 static const char null[] = "(null)";
 
@@ -848,15 +854,10 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap)
   f = lead_str_end = find_spec (format, &mbstate);
 
   /* Lock stream.  */
-#ifdef USE_IN_LIBIO
-  __libc_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, s);
-#else
-#if 0
-  /* XXX For now stdio has no locking.  */
   __libc_cleanup_region_start ((void (*) (void *)) &__funlockfile, s);
-#endif
-#endif
-  __flockfile (s);
+
+  if (__flockfile != NULL)
+    __flockfile (s);
 
   /* Write the literal text before the first format.  */
   outstring ((const UCHAR_T *) format,