unix datagram sendto with accommodating buffer size
npm install sendtounix datagrams on osx have system send buffer limits of 2048 bytes.
this module performs a posix sendto() but first sets socket option SO_SNDBUF, raising the send limit size up to the size of whatever node buffer you pass.
``bash`
npm i sendto
node -e "require('sendto')('/tmp/a', Buffer('hello'))"
pass a unix datagram socket path and then the buffer, something like:
`js`
const sendto = require('sendto')
const str = 'some buffer bigger than this'
sendto('/tmp/mysocketpath', Buffer(str) )
special note on sendto(str, Buffer). there are two ways to interrupt or force node process to exit:
* not giving node buffer
* to an addressable sockname on recv side (bind the recv() first before sendto())
#### my ideas on that:
implicit coercion seems to be preferred by JavaScript over type checking, i.e. convert input to a buffer for the user. And where there's no socket address, we should probably back-off and retry to send later. Or emit JavaScript error event about the missing addressable path. Probably overkill to do a JS error, since the native perror()` call already does some descriptive noise about it, though less catchable in JS