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% File src/library/base/man/socketSelect.Rd
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2020 R Core Team
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% Distributed under GPL 2 or later
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\name{socketSelect}
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\alias{socketSelect}
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\title{Wait on Socket Connections}
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\usage{
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socketSelect(socklist, write = FALSE, timeout = NULL)
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}
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\arguments{
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  \item{socklist}{list of open socket connections and server sockets.}
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  \item{write}{logical.  If \code{TRUE} wait for corresponding socket to
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               become available for writing; otherwise wait for it to become
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               available for reading or for accepting an incoming
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               connection (server sockets).}
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  \item{timeout}{numeric or \code{NULL}. Time in seconds to wait for a
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                 socket to become available; \code{NULL} means wait
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                 indefinitely.}
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}
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\description{
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  Waits for the first of several socket connections and server sockets
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  to become available.
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}
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\value{Logical the same length as \code{socklist} indicating
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  whether the corresponding socket connection is available for
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  output or input, depending on the corresponding value of \code{write}.
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  Server sockets can only become available for input.
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}
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\details{
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  The values in \code{write} are recycled if necessary to make up a
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  logical vector the same length as \code{socklist}. Socket connections
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  can appear more than once in \code{socklist}; this can be useful if
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  you want to determine whether a socket is available for reading or
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  writing.
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}
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\examples{
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\dontrun{
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## test whether socket connection s is available for writing or reading
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socketSelect(list(s, s), c(TRUE, FALSE), timeout = 0)
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}
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}
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\keyword{connection}