read.socket {utils}R Documentation

Read from or Write to a Socket

Description

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.

Usage

read.socket(socket, maxlen = 256L, loop = FALSE)
write.socket(socket, string)

Arguments

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.

Value

read.socket returns the string read as a length-one character vector.

write.socket returns the number of bytes written.

Author(s)

Thomas Lumley

See Also

close.socket, make.socket

Examples

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)

[Package utils version 3.0.0 Index]