From fd1ec1aeaa7f810126be6371d44e387b815490f9 Mon Sep 17 00:00:00 2001
From: Christian Ulrich <christian@ulrich.earth>
Date: Sat, 13 Jun 2020 12:33:00 +0200
Subject: [PATCH] need to use return value of recvmsg for length of received
 data

---
 asyncutils.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/asyncutils.nim b/asyncutils.nim
index 5b9afc1..e010d71 100644
--- a/asyncutils.nim
+++ b/asyncutils.nim
@@ -138,7 +138,9 @@ proc asyncRecvMsg*(fd: AsyncFD,
         retFuture.fail(newException(ValueError, "unexpected ancillary data"))
         return
 
-    dataBuffer.setLen(msg.msg_iov.iov_len)
+    # FIXME: This will not work on FreeBSD as recvmsg(2) says:
+    # recvmmsg() returns the number of messages received
+    dataBuffer.setLen(res)
     retFuture.complete((dataBuffer, ancillaryData))
 
   addRead(fd, cb)