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-rw-r--r--posix/unistd.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index e73673121e..08a3d47463 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -977,6 +977,13 @@ extern int fsync (int __fd);
 #endif /* Use BSD || X/Open || Unix98.  */
 
 
+#ifdef __USE_GNU
+/* Make all changes done to all files on the file system associated
+   with FD actually appear on disk.  */
+extern int syncfs (int __fd) __THROW;
+#endif
+
+
 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 
 /* Return identifier for the current host.  */