Re: Turning sendfile into copyfd

Stephen R. van den Berg (
Tue, 7 Jul 1998 11:37:35 +0200

Pavel Machek wrote:
>I should probably provide some way to specify 'copy until EOF'

Please keep count==0 to specify zero bytes. Use something like count==-1
for copy till EOF.

> Also, if I end up copying more than 4G of data, what
>value should I return? This needs to be solved.

Copy 2GB-PAGE_SIZE, then return, set errno to EAGAIN or something.
If we're copying more than 2GB, then the overhead of putting a loop
on it in userspace is negligible.

           Stephen R. van den Berg (AKA BuGless).
"I don't like this word bomb.  It is not a bomb, it is a device,
 which explodes."  French Ambassador about the atomic tests.

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to