make.socket {utils} | R Documentation |
With server = FALSE
attempts to open a client socket to the
specified port and host. With server = TRUE
listens on the
specified port for a connection and then returns a server socket. It is
a good idea to use on.exit
to ensure that a socket is
closed, as you only get 64 of them.
make.socket(host = "localhost", port, fail = TRUE, server = FALSE)
host |
name of remote host |
port |
port to connect to/listen on |
fail |
failure to connect is an error? |
server |
a server socket? |
An object of class "socket"
.
socket |
socket number. This is for internal use |
port |
port number of the connection |
host |
name of remote computer |
I don't know if the connecting host name returned
when server = TRUE
can be trusted. I suspect not.
Thomas Lumley
Adapted from Luke Tierney's code for XLISP-Stat
, in turn
based on code from Robbins and Robbins "Practical UNIX Programming"
close.socket
, read.socket
daytime <- function(host = "localhost"){
a <- make.socket(host, 13)
on.exit(close.socket(a))
read.socket(a)
}
## Official time (UTC) from US Naval Observatory
## Not run: daytime("tick.usno.navy.mil")