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-rw-r--r--sys/sys/socket.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index de96518ed01d..6efdaee6b3ff 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -393,6 +393,7 @@ struct msghdr {
#if __BSD_VISIBLE
#define MSG_DONTWAIT 0x80 /* this message should be nonblocking */
#define MSG_EOF 0x100 /* data completes connection */
+#define MSG_NBIO 0x4000 /* FIONBIO mode, used by fifofs */
#define MSG_COMPAT 0x8000 /* used in sendit() */
#endif