make.socket

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Create a Socket Connection

With server = FALSE attempts to open a client socket to the specified port and host. With server = TRUE the Rprocess 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.

Keywords
misc
Usage
make.socket(host = "localhost", port, fail = TRUE, server = FALSE)
Arguments
host
name of remote host
port
port to connect to/listen on
fail
failure to connect is an error?
server
a server socket?
Value

  • An object of class "socket", a list with components:
  • socketsocket number. This is for internal use. On a Unix-alike it is a file descriptor.
  • portport number of the connection.
  • hostname of remote computer.

Warning

I don't know if the connecting host name returned when server = TRUE can be trusted. I suspect not.

References

Adapted from Luke Tierney's code for XLISP-Stat, in turn based on code from Robbins and Robbins Practical UNIX Programming.

See Also

close.socket, read.socket.

Compiling in support for sockets was optional prior to R3.3.0: see capabilities("sockets") to see if it is available.

Aliases
  • make.socket
  • print.socket
Examples
library(utils) daytime <- function(host = "localhost"){ a <- make.socket(host, 13) on.exit(close.socket(a)) read.socket(a) } ## Official time (UTC) from US Naval Observatory daytime("tick.usno.navy.mil")
Documentation reproduced from package utils, version 3.3, License: Part of R 3.3

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