socketSelect

R Base 3.6.2

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

Syntax

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

Arguments

Parameter	Description
`socklist`	list of open socket connections
`write`	logical. If TRUE wait for corresponding socket to become available for writing; otherwise wait for it to become available for reading.
`timeout`	numeric or NULL. Time in seconds to wait for a socket to become available; NULL means wait indefinitely.

Return 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.

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.

Examples

Example

# NOT RUN {
## test whether socket connection s is available for writing or reading
socketSelect(list(s, s), c(TRUE, FALSE), timeout = 0)
# }