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-rw-r--r--include/unistd.h2
-rw-r--r--libc/sysdeps/linux/common/syncfs.c13
2 files changed, 14 insertions, 1 deletions
diff --git a/include/unistd.h b/include/unistd.h
index 3793d2d3e..4701dabf8 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -1073,7 +1073,7 @@ extern char *getpass (const char *__prompt) __nonnull ((1));
extern int fsync (int __fd);
#endif /* Use BSD || X/Open || Unix98. */
-#if 0 /*def __USE_GNU */
+#if __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;
diff --git a/libc/sysdeps/linux/common/syncfs.c b/libc/sysdeps/linux/common/syncfs.c
new file mode 100644
index 000000000..831f76568
--- /dev/null
+++ b/libc/sysdeps/linux/common/syncfs.c
@@ -0,0 +1,13 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2015 Bartosz Golaszewski <bartekgola@gmail.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+
+#if defined(__NR_syncfs) && __USE_GNU
+#include <unistd.h>
+_syscall1(int, syncfs, int, fd)
+#endif