Index: lib/libnv/msgio.h
===================================================================
--- lib/libnv/msgio.h
+++ lib/libnv/msgio.h
@@ -47,6 +47,6 @@
 int fd_recv(int sock, int *fds, size_t nfds);
 
 int buf_send(int sock, void *buf, size_t size);
-int buf_recv(int sock, void *buf, size_t size);
+int buf_recv(int sock, void *buf, size_t size, int flags);
 
 #endif	/* !_MSGIO_H_ */
Index: lib/libnv/msgio.c
===================================================================
--- lib/libnv/msgio.c
+++ lib/libnv/msgio.c
@@ -450,7 +450,7 @@
 }
 
 int
-buf_recv(int sock, void *buf, size_t size)
+buf_recv(int sock, void *buf, size_t size, int flags)
 {
 	ssize_t done;
 	unsigned char *ptr;
@@ -461,7 +461,7 @@
 	ptr = buf;
 	while (size > 0) {
 		fd_wait(sock, true);
-		done = recv(sock, ptr, size, 0);
+		done = recv(sock, ptr, size, flags);
 		if (done == -1) {
 			if (errno == EINTR)
 				continue;
Index: sys/contrib/libnv/nvlist.c
===================================================================
--- sys/contrib/libnv/nvlist.c
+++ sys/contrib/libnv/nvlist.c
@@ -1280,7 +1280,7 @@
 	size_t nfds, size, i;
 	int *fds;
 
-	if (buf_recv(sock, &nvlhdr, sizeof(nvlhdr)) == -1)
+	if (buf_recv(sock, &nvlhdr, sizeof(nvlhdr), 0) == -1)
 		return (NULL);
 
 	if (!nvlist_check_header(&nvlhdr))
@@ -1298,7 +1298,7 @@
 	ret = NULL;
 	fds = NULL;
 
-	if (buf_recv(sock, buf + sizeof(nvlhdr), size - sizeof(nvlhdr)) == -1)
+	if (buf_recv(sock, buf + sizeof(nvlhdr), size - sizeof(nvlhdr), 0) == -1)
 		goto out;
 
 	if (nfds > 0) {