Let me pull back from the details a bit, to note a code pattern I'm
beginning to see:
if (src_fd is a file &&
dest_fd is a socket)
sendfile()
else
hand code fd->fd data move
with splice this becomes
if (special case fd combination #1)
sendfile()
else (special case fd combination #2)
splice()
else
hand code fd->fd data move
Creating a syscall for each fd->fd data move case seems wasteful. I
would rather that the kernel Does The Right Thing so the app doesn't
have to support all these special cases. Handling the implicit buffer
case in the kernel, when needed, means that the app is future-proofed:
when another fd->fd optimization is implemented, the app automatically
takes advantage of it.
Jeff
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