[RFC] Zero-length write() does not generate a datagram on connected socket

[Stephen Hemminger]

The bug http://bugzilla.kernel.org/show_bug.cgi?id=5731
describes an issue where write() can't be used to generate a zero-length
datagram (but send, and sendto do work).

I think the following is needed:

--- a/net/socket.c      2007-08-20 09:54:28.000000000 -0700
+++ b/net/socket.c      2007-09-24 15:31:25.000000000 -0700
@@ -777,8 +777,11 @@ static ssize_t sock_aio_write(struct kio
        if (pos != 0)
                return -ESPIPE;
 
-       if (iocb->ki_left == 0) /* Match SYS5 behaviour */
-               return 0;
+       if (unlikely(iocb->ki_left == 0)) {
+               struct socket *sock = iocb->ki_filp->private_data;
+               if (sock->type == SOCK_STREAM)
+                       return 0;
+       }
 
        x = alloc_sock_iocb(iocb, &siocb);
        if (!x)
-
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