On Fri, Aug 5, 2011 at 6:34 PM, Wes Hardaker <[email protected]
> wrote:
> >>>>> On Fri, 5 Aug 2011 11:42:36 +0200, Bart Van Assche <
> [email protected]> said:
>
> BVA> I'm not sure the above is correct. My interpretation is that
> MSG_DONTWAIT
> BVA> returns as soon as the send buffer is full, hence using that flag in
> BVA> apps/sshtosnmp.c is dangerous.
>
> Where did you read that?
>
> In the linux man page it says (only):
>
> MSG_DONTWAIT (since Linux 2.2)
> Enables nonblocking operation; if the operation would
> block,
> EAGAIN or EWOULDBLOCK is returned (this can also be
> enabled
> using the O_NONBLOCK flag with the F_SETFL fcntl(2)).
>
As far as I know you avoid reading GPLv2 licensed source code in order to
avoid copyright violations ?
Anyway, I had a look at the implementation in the Linux kernel of TCP
sending. As anyone can see in tcp_sendmsg(), the MSG_DONTWAIT flag prevents
that that function blocks but does not prevent that function to send data
over the socket.
See also
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=net/ipv4/tcp.c
Bart.
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