# Pipes

# pipe

(pipe [direction = 'inout] [closeonexec = #t])
=> (values in out)

Creates a pipe.

The parameter direction controls the returned values:

• if the direction is inout, it returns two raw devices for input and output
• if the direction is in, it returns a raw device for input and a file descriptor for output
• if the direction is out, it returns a file descriptor for input and a raw device for output
• if the direction is none, it returns two file descriptors for input and output.

If the closeonexec parameter is true, then the raw devices are set to close on exec. Note that the file descriptors are not affected by the option, and they are not set to nonblocking either.