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processes: 'process-open-files' ignores disappeared /proc/PID/fd entries. 

Previously, 'process-open-files' would throw ENOENT if an entry had
vanished after the 'scandir' call and before the 'readlink' call.

* guix/scripts/processes.scm (process-open-files): Catch ENOENT errors
from 'readlink'.
This commit is contained in:
Ludovic Courtès 2019-04-29 21:39:38 +02:00
parent 6b99afeef8
commit c21d912a02
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 11 additions and 4 deletions
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15
guix/scripts/processes.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -103,9 +103,16 @@ processes."
(let ((directory (string-append "/proc/"
(number->string (process-id process))
"/fd")))
(map (lambda (fd)
(readlink (string-append directory "/" fd)))
(or (scandir directory string->number) '()))))
(filter-map (lambda (fd)
;; There's a TOCTTOU race here, hence the 'catch'.
(catch 'system-error
(lambda ()
(readlink (string-append directory "/" fd)))
(lambda args
(if (= ENOENT (system-error-errno args))
#f
(apply throw args)))))
(or (scandir directory string->number) '()))))
;; Daemon session.
(define-record-type <daemon-session>