test-suite/tests/popen.test

   1 ;;;; popen.test --- exercise ice-9/popen.scm      -*- scheme -*-
   2 ;;;;
   3 ;;;; Copyright 2003, 2006 Free Software Foundation, Inc.
   4 ;;;;
   5 ;;;; This library is free software; you can redistribute it and/or
   6 ;;;; modify it under the terms of the GNU Lesser General Public
   7 ;;;; License as published by the Free Software Foundation; either
   8 ;;;; version 2.1 of the License, or (at your option) any later version.
   9 ;;;;
  10 ;;;; This library is distributed in the hope that it will be useful,
  11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 ;;;; Lesser General Public License for more details.
  14 ;;;;
  15 ;;;; You should have received a copy of the GNU Lesser General Public
  16 ;;;; License along with this library; if not, write to the Free Software
  17 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18
  19 (define-module (test-suite test-ice-9-popen)
  20   #:use-module (test-suite lib)
  21   #:use-module (ice-9 popen))
  22
  23
  24 ;; read from PORT until eof is reached, return what's read as a string
  25 (define (read-string-to-eof port)
  26   (do ((lst '() (cons c lst))
  27        (c (read-char port) (read-char port)))
  28       ((eof-object? c)
  29        (list->string (reverse! lst)))))
  30
  31 ;; call (THUNK), with SIGPIPE set to SIG_IGN so that an EPIPE error is
  32 ;; generated rather than a SIGPIPE signal
  33 (define (with-epipe thunk)
  34   (dynamic-wind
  35       (lambda ()
  36         (sigaction SIGPIPE SIG_IGN))
  37       thunk
  38       restore-signals))
  39
  40
  41 ;;
  42 ;; open-input-pipe
  43 ;;
  44
  45 (with-test-prefix "open-input-pipe"
  46
  47   (pass-if-exception "no args" exception:wrong-num-args
  48     (open-input-pipe))
  49
  50   (pass-if "port?"
  51     (port? (open-input-pipe "echo hello")))
  52
  53   (pass-if "echo hello"
  54     (string=? "hello\n" (read-string-to-eof (open-input-pipe "echo hello"))))
  55
  56   ;; exercise file descriptor setups when stdin is the same as stderr
  57   (pass-if "stdin==stderr"
  58     (let ((port (open-file "/dev/null" "r+")))
  59       (with-input-from-port port
  60         (lambda ()
  61           (with-error-to-port port
  62             (lambda ()
  63               (open-input-pipe "echo hello"))))))
  64     #t)
  65
  66   ;; exercise file descriptor setups when stdout is the same as stderr
  67   (pass-if "stdout==stderr"
  68     (let ((port (open-file "/dev/null" "r+")))
  69       (with-output-to-port port
  70         (lambda ()
  71           (with-error-to-port port
  72             (lambda ()
  73               (open-input-pipe "echo hello"))))))
  74     #t)
  75
  76   (pass-if "open-input-pipe process gets (current-input-port) as stdin"
  77     (let* ((p2c (pipe))
  78            (port (with-input-from-port (car p2c)
  79                    (lambda ()
  80                      (open-input-pipe "read && echo $REPLY")))))
  81       (display "hello\n" (cdr p2c))
  82       (force-output (cdr p2c))
  83       (let ((result (eq? (read port) 'hello)))
  84         (close-port (cdr p2c))
  85         (close-pipe port)
  86         result)))
  87
  88   ;; After the child closes stdout (which it indicates here by writing
  89   ;; "closed" to stderr), the parent should see eof.  In Guile 1.6.4
  90   ;; and earlier a duplicate of stdout existed in the child, meaning
  91   ;; eof was not seen.
  92   ;;
  93   ;; Note that the objective here is to test that the parent sees EOF
  94   ;; while the child is still alive.  (It is obvious that the parent
  95   ;; must see EOF once the child has died.)  The use of the `p2c'
  96   ;; pipe, and `echo closed' and `read' in the child, allows us to be
  97   ;; sure that we are testing what the parent sees at a point where
  98   ;; the child has closed stdout but is still alive.
  99   (pass-if "no duplicate"
 100     (let* ((c2p (pipe))
 101            (p2c (pipe))
 102            (port (with-error-to-port (cdr c2p)
 103                    (lambda ()
 104                      (with-input-from-port (car p2c)
 105                        (lambda ()
 106                          (open-input-pipe
 107                           "exec 1>/dev/null; echo closed 1>&2; exec 2>/dev/null; read")))))))
 108       (close-port (cdr c2p))   ;; write side
 109       (let ((result (eof-object? (read-char port))))
 110         (display "hello!\n" (cdr p2c))
 111         (force-output (cdr p2c))
 112         (close-pipe port)
 113         result)))
 114
 115   )
 116
 117 ;;
 118 ;; open-output-pipe
 119 ;;
 120
 121 (with-test-prefix "open-output-pipe"
 122
 123   (pass-if-exception "no args" exception:wrong-num-args
 124     (open-output-pipe))
 125
 126   (pass-if "port?"
 127     (port? (open-output-pipe "exit 0")))
 128
 129   ;; exercise file descriptor setups when stdin is the same as stderr
 130   (pass-if "stdin==stderr"
 131     (let ((port (open-file "/dev/null" "r+")))
 132       (with-input-from-port port
 133         (lambda ()
 134           (with-error-to-port port
 135             (lambda ()
 136               (open-output-pipe "exit 0"))))))
 137     #t)
 138
 139   ;; exercise file descriptor setups when stdout is the same as stderr
 140   (pass-if "stdout==stderr"
 141     (let ((port (open-file "/dev/null" "r+")))
 142       (with-output-to-port port
 143         (lambda ()
 144           (with-error-to-port port
 145             (lambda ()
 146               (open-output-pipe "exit 0"))))))
 147     #t)
 148
 149   ;; After the child closes stdin (which it indicates here by writing
 150   ;; "closed" to stderr), the parent should see a broken pipe.  We
 151   ;; setup to see this as EPIPE (rather than SIGPIPE).  In Guile 1.6.4
 152   ;; and earlier a duplicate of stdin existed in the child, preventing
 153   ;; the broken pipe occurring.
 154   ;;
 155   ;; Note that the objective here is to test that the parent sees a
 156   ;; broken pipe while the child is still alive.  (It is obvious that
 157   ;; the parent will see a broken pipe once the child has died.)  The
 158   ;; use of the `c2p' pipe, and the repeated `echo closed' in the
 159   ;; child, allows us to be sure that we are testing what the parent
 160   ;; sees at a point where the child has closed stdin but is still
 161   ;; alive.
 162   ;;
 163   ;; Note that `with-epipe' must apply only to the parent and not to
 164   ;; the child process; we rely on the child getting SIGPIPE, to
 165   ;; terminate it (and avoid leaving a zombie).
 166   (pass-if "no duplicate"
 167     (let* ((c2p (pipe))
 168            (port (with-error-to-port (cdr c2p)
 169                    (lambda ()
 170                      (open-output-pipe
 171                       "exec 0</dev/null; while true; do echo closed 1>&2; done")))))
 172       (close-port (cdr c2p))   ;; write side
 173       (with-epipe
 174        (lambda ()
 175          (let ((result
 176                 (and (char? (read-char (car c2p))) ;; wait for child to do its thing
 177                      (catch 'system-error
 178                             (lambda ()
 179                               (write-char #\x port)
 180                               (force-output port)
 181                               #f)
 182                             (lambda (key name fmt args errno-list)
 183                               (= (car errno-list) EPIPE))))))
 184            ;; Now close our reading end of the pipe.  This should give
 185            ;; the child a broken pipe and so allow it to exit.
 186            (close-port (car c2p))
 187            (close-pipe port)
 188            result)))))
 189
 190   )
 191
 192 ;;
 193 ;; close-pipe
 194 ;;
 195
 196 (with-test-prefix "close-pipe"
 197
 198   (pass-if-exception "no args" exception:wrong-num-args
 199     (close-pipe))
 200
 201   (pass-if "exit 0"
 202     (let ((st (close-pipe (open-output-pipe "exit 0"))))
 203       (and (status:exit-val st)
 204            (= 0 (status:exit-val st)))))
 205
 206   (pass-if "exit 1"
 207     (let ((st (close-pipe (open-output-pipe "exit 1"))))
 208       (and (status:exit-val st)
 209            (= 1 (status:exit-val st))))))
 210