Check whether a TCP port can be opened or not
canPortBeUsed(port)
(integer) A TCP port in [0, 65535].
canPortBeUsed(port)
returns a logical indicating whether the port can
be opened or not, or cannot be queried. If the port can be opened,
then TRUE
is returned, if cannot be opened then FALSE
is returned,
which may happen if the port is used by another process.
If port querying is not supported, as in R (< 4.0.0), then NA
is
returned.