These procedures provide an interface to the
pclose system routines.
(open-pipe command OPEN_READ).
(open-pipe command OPEN_WRITE).
open-pipe, then waits for the process to terminate and returns its status value, See section Processes, for information on how to interpret this value.
close-port (see section Closing Ports) can also be used to
close a pipe, but doesn't return the status.
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