proto: struct thread *td, struct sendfile_args *uap
parms: td, uap
errors:
  - EAGAIN
  - EBADF
  - EBUSY
  - EFAULT
  - EINTR
  - EINVAL
  - EINVAL
  - EIO
  - ENOTCAPABLE
  - ENOBUFS
  - ENOTCONN
  - ENOTSOCK
  - EOPNOTSUPP
  - EPIPE
profiles:
  - net
