proto: struct thread *td, struct sendto_args *uap
parms: td, uap
errors:
  - EBADF
  - EACCES
  - ENOTSOCK
  - EFAULT
  - EMSGSIZE
  - EAGAIN
  - ENOBUFS
  - EHOSTUNREACH
  - EISCONN
  - ECONNREFUSED
  - EHOSTDOWN
  - ENETDOWN
  - EADDRNOTAVAIL
  - EPIPE
profiles:
  - net
