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docs: add example for subprocess

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Closes #3395
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Walter H. Yang 2020-11-02 23:05:04 +08:00 committed by GitHub
parent 0a7c4e2613
commit 10cc9a605e
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1 changed files with 13 additions and 0 deletions
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pkgs/racket-doc/scribblings/reference/subprocess.scrbl
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@ -136,6 +136,19 @@ A subprocess can be used as a @tech{synchronizable event} (see @secref["sync"]).
A subprocess value is @tech{ready for synchronization} when A subprocess value is @tech{ready for synchronization} when
@racket[subprocess-wait] would not block; @resultItself{subprocess value}. @racket[subprocess-wait] would not block; @resultItself{subprocess value}.
Example:
@racketblock[
(define-values (sp out in err)
(subprocess #f #f #f "/bin/ls" "-l"))
(printf "stdout:\n~a" (port->string out))
(printf "stderr:\n~a" (port->string err))
(close-input-port out)
(close-output-port in)
(close-input-port err)
(subprocess-wait sp)
]
@history[#:changed "6.11.0.1" @elem{Added the @racket[group] argument.} @history[#:changed "6.11.0.1" @elem{Added the @racket[group] argument.}
#:changed "7.4.0.5" @elem{Added waiting for a fifo without a reader #:changed "7.4.0.5" @elem{Added waiting for a fifo without a reader
as @racket[stdout] and/or @racket[stderr].}]} as @racket[stdout] and/or @racket[stderr].}]}