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(open-process): Close input-fdes, output-fdes and

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error-fdes after duping them to 0, 1 and 2.
This commit is contained in:
Kevin Ryde 2003-09-19 01:11:34 +00:00
parent 0ed417f42b
commit 557b225f49
1 changed files with 14 additions and 7 deletions
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19
ice-9/popen.scm
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@ -106,23 +106,30 @@
(= pt-fileno error-fdes)))
(close-fdes pt-fileno))))))
;; copy the three selected descriptors to the standard
;; descriptors 0, 1, 2. note that it's possible that
;; output-fdes or input-fdes is equal to error-fdes.
;; Copy the three selected descriptors to the standard
;; descriptors 0, 1, 2, if not already there
(cond ((not (= input-fdes 0))
(if (= output-fdes 0)
(set! output-fdes (dup->fdes 0)))
(if (= error-fdes 0)
(set! error-fdes (dup->fdes 0)))
(dup2 input-fdes 0)))
(dup2 input-fdes 0)
;; it's possible input-fdes is error-fdes
(if (not (= input-fdes error-fdes))
(close-fdes input-fdes))))
(cond ((not (= output-fdes 1))
(if (= error-fdes 1)
(set! error-fdes (dup->fdes 1)))
(dup2 output-fdes 1)))
(dup2 output-fdes 1)
;; it's possible output-fdes is error-fdes
(if (not (= output-fdes error-fdes))
(close-fdes output-fdes))))
(dup2 error-fdes 2)
(cond ((not (= error-fdes 2))
(dup2 error-fdes 2)
(close-fdes error-fdes)))
(apply execlp prog prog args)))