read.socket | R Documentation |
read.socket
reads a string from the specified socket,
write.socket
writes to the specified socket. There is very
little error checking done by either.
read.socket(socket, maxlen = 256L, loop = FALSE) write.socket(socket, string)
socket |
a socket object. |
maxlen |
maximum length (in bytes) of string to read. |
loop |
wait for ever if there is nothing to read? |
string |
string to write to socket. |
read.socket
returns the string read as a length-one character vector.
write.socket
returns the number of bytes written.
Thomas Lumley
close.socket
, make.socket
finger <- function(user, host = "localhost", port = 79, print = TRUE) { if (!is.character(user)) stop("user name must be a string") user <- paste(user,"\r\n") socket <- make.socket(host, port) on.exit(close.socket(socket)) write.socket(socket, user) output <- character(0) repeat{ ss <- read.socket(socket) if (ss == "") break output <- paste(output, ss) } close.socket(socket) if (print) cat(output) invisible(output) } ## Not run: finger("root") ## only works if your site provides a finger daemon ## End(Not run)
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