R: Wait on Socket Connections

socketSelect {base} | R Documentation

## Wait on Socket Connections

### Description

Waits for the first of several socket connections and server sockets to become available.

### Usage

    socketSelect(socklist, write = FALSE, timeout = NULL)

### Arguments

`socklist` | list of open socket connections and server sockets.
`write` | logical. If `TRUE` wait for corresponding socket to become available for writing; otherwise wait for it to become available for reading or for accepting an incoming connection (server sockets).
`timeout` | numeric or `NULL`. Time in seconds to wait for a socket to become available; `NULL` means wait indefinitely.

### Details

The values in `write` are recycled if necessary to make up a logical vector the same length as `socklist`. Socket connections can appear more than once in `socklist`; this can be useful if you want to determine whether a socket is available for reading or writing.

### Value

Logical the same length as `socklist` indicating whether the corresponding socket connection is available for output or input, depending on the corresponding value of `write`. Server sockets can only become available for input.

### Examples

    ## Not run:
    ## test whether socket connection s is available for writing or reading
    socketSelect(list(s, s), c(TRUE, FALSE), timeout = 0)

    ## End(Not run)

[Package base version 4.0.5 Index]