A trait which is implemented for
allowing them to send multiple messages using one system call.
Sends all the specified messages of
packets using one system call, and
assigns the total bytes sent for each packet into the first slice
elements. If you want, you can send remaining bytes later.
The provided socket must be connected to the remote address before
calling this function, otherwise,
might be returned.
Other kinds of errors can also be returned, see the errors descriptions