the realities of splice

the realities of splice

So I don't understand qhat is this new syscall for!!
Sendfile is seems much better, 'cos it can manipulate with any fd...

Only a "plus" - it's faster[but it works with pipes!!!].
It seems to me that better to modify sendfile call for pipes mode.

Now, if I write new progrom I should write
#ifdef __splice
splice(..)
#elif __tee
tee(...)
#else
sendfile(..)
#endif

I can't see what are them really for...