Waits for the first of several socket connections and server sockets to become available.
list of open socket connections and server sockets.
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
Logical the same length as
whether the corresponding socket connection is available for
output or input, depending on the corresponding value of
Server sockets can only become available for input.
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