> Stephen Hemminger <shemminger@linux-foundation.org> wrote:
>> 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;
>> + }
>
> I'm not sure whether all STREAM protocols treat zero-length
> sends as no-ops. What about SCTP?
