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-rw-r--r--libio/libio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/libio/libio.h b/libio/libio.h
index e662f48918..770cb6d2b3 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -442,6 +442,10 @@ extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
 
 #ifdef _IO_MTSAFE_IO
 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
+# define _IO_flockfile(_fp) \
+  if (((_fp)->_mode & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
+# define _IO_funlockfile(_fp) \
+  if (((_fp)->_mode & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
 #else
 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 # define _IO_flockfile(_fp) /**/