diff --git a/libc/kernel/uapi/linux/iio/buffer.h b/libc/kernel/uapi/linux/iio/buffer.h
index 45c6f65..7e03a8c 100644
--- a/libc/kernel/uapi/linux/iio/buffer.h
+++ b/libc/kernel/uapi/linux/iio/buffer.h
@@ -6,5 +6,16 @@
  */
 #ifndef _UAPI_IIO_BUFFER_H_
 #define _UAPI_IIO_BUFFER_H_
+#include <linux/types.h>
+#define IIO_BUFFER_DMABUF_CYCLIC (1 << 0)
+#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000001
+struct iio_dmabuf {
+  __u32 fd;
+  __u32 flags;
+  __u64 bytes_used;
+};
 #define IIO_BUFFER_GET_FD_IOCTL _IOWR('i', 0x91, int)
+#define IIO_BUFFER_DMABUF_ATTACH_IOCTL _IOW('i', 0x92, int)
+#define IIO_BUFFER_DMABUF_DETACH_IOCTL _IOW('i', 0x93, int)
+#define IIO_BUFFER_DMABUF_ENQUEUE_IOCTL _IOW('i', 0x94, struct iio_dmabuf)
 #endif