#34 send() needs arg to specify a file(port) to send on

[Charles Evans]

after f:=open(port,"nua") and select()
one could receive packets from several sources.
for a dns proxy, they expect replies from port 53;
many refuse to use replies from other ports.
these must often be sent out of order with send()
in order to specify the send address.

send() is currently opening a new socket (on a new port).
It needs to work like write() accepting optionally a file
(which must be a UDP socket) to send on the file's port.

[Charles Evans]

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should the socket created by send()
be closed if the send fails?
rposix.r: close(f) is NOT done if sendto() fails.

[Nobody/Anonymous]

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to clarify, should send() _without_ a file arg call close(f)?
I recall older versions using up all my ports after awhile.
(send(f,msg) should of course not close f.)