Waits for the first of several socket connections to become available.
list of open socket connections
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
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