workaround segfault (need to investigate later)

asyncutils.nim

@@ -91,6 +91,7 @@ proc asyncSendMsg*(fd: AsyncFD, data: string,
         cmsgHeader.cmsg_type = cmsg.msgType.int32
         copyMem(CMSG_DATA(cmsgHeader), cmsg.data.cstring, cmsg.data.len)
         cmsgHeader = CMSG_NXTHDR(addr msg, cmsgHeader)
+        echo "cmsgHeader = ", cast[int](cmsgHeader)
 
     let res = sendmsg(sock.SocketHandle, addr msg, 0)
     if res < 0:

examples/app/app.nim

@@ -79,12 +79,14 @@ proc handlePunchdMessages(conn: PunchdConnection) {.async.} =
     let fd = conn.sock.getFd.AsyncFD
     let resp = await fd.asyncRecvMsg(size = 400, cmsgSize = sizeof(AsyncFD))
     let line = resp.data.strip(leading = false, trailing = true, chars = {'\n'})
+    echo "received punchd message: ", line
     let args = line.parseArgs(3, 1)
     case args[0]:
     of "ok":
       let outMsg = conn.outMessages[args[1]]
       conn.outMessages.del(args[1])
-      if resp.cmsgs.len != 1:
+      if resp.cmsgs.len < 1:
+        echo "no cmsg"
         raise newException(ValueError, "invalid punchd message")
       let sock = newAsyncSocket(resp.cmsgs[0].getFd)
       register(sock.getFd.AsyncFD)

punchd.nim

@@ -104,7 +104,9 @@ proc main() =
   except Sigint:
     for puncher in punchd.punchers:
       waitFor puncher.cleanup()
+    punchd.unixSocket.close()
     removeFile(PunchdSocket)
+    quit(0)
 
 when isMainModule:
   main()