Hello,
  This is just a wild guess: maybe it has to do with that
 sendfile()  is for copying  data between one file descriptor and
another; sendfile() invokes sendpage() of the corresponding protocol.

With AF_UNIX sockets, which are IPC mechanism,  you can pass file
descriptors from one process to another
using control messages (ancillary data).
You can do it with SCM_RIGHTS type control message. (the msg_control
of msg should point to a cmsghdr with SCM_RIGHTS as its cmsg_type)

Just want to reiterate that I am not sure about it.

Regards,
Rami Rosen



2009/6/29 Rémi Denis-Courmont <remi.denis-courmont@nokia.com>:
quoted text
>
>        Hello,
>
> Am I unaware of some fundamental reasons why AF_UNIX sockets do not support
> sendpage(splice)? or is it just that nobody bothered to write the code?
>
> --
> Rémi Denis-Courmont
> Nokia Devices R&D, Maemo Software, Helsinki
>
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