aboutsummaryrefslogtreecommitdiff
path: root/tests/syscalls.scm
blob: 340c1147de8f6c5e993ad5204e1e39ebae103c42 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2020 Simon South <simon@simonsouth.net>
;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (test-syscalls)
  #:use-module (guix utils)
  #:use-module (guix build syscalls)
  #:use-module (gnu build linux-container)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-64)
  #:use-module (srfi srfi-71)
  #:use-module (system foreign)
  #:use-module ((ice-9 ftw) #:select (scandir))
  #:use-module (ice-9 match))

;; Test the (guix build syscalls) module, although there's not much that can
;; actually be tested without being root.

(define temp-file
  (string-append "t-utils-" (number->string (getpid))))


(test-begin "syscalls")

(test-equal "mount, ENOENT"
  ENOENT
  (catch 'system-error
    (lambda ()
      (mount "/dev/null" "/does-not-exist" "ext2")
      #f)
    (compose system-error-errno list)))

(test-assert "umount, ENOENT/EPERM"
  (catch 'system-error
    (lambda ()
      (umount "/does-not-exist")
      #f)
    (lambda args
      ;; Both return values have been encountered in the wild.
      (memv (system-error-errno args) (list EPERM ENOENT)))))

(test-assert "mounts"
  ;; Check for one of the common mount points.
  (let ((mounts (mounts)))
    (any (match-lambda
           ((point . type)
            (let ((mount (find (lambda (mount)
                                 (string=? (mount-point mount) point))
                               mounts)))
              (and mount
                   (string=? (mount-type mount) type)))))
         '(("/proc"    . "proc")
           ("/sys"     . "sysfs")
           ("/dev/shm" . "tmpfs")))))

(test-assert "mount-points"
  ;; Reportedly "/" is not always listed as a mount point, so check a few
  ;; others (see <http://bugs.gnu.org/20261>.)
  (any (cute member <> (mount-points))
       '("/" "/proc" "/sys" "/dev")))

(false-if-exception (delete-file temp-file))
(test-equal "utime with AT_SYMLINK_NOFOLLOW"
  '(0 0)
  (begin
    ;; Test libguile's utime with AT_SYMLINK_NOFOLLOW, which libguile does not
    ;; define as of Guile 2.2.4.
    (symlink "/nowhere" temp-file)
    (utime temp-file 0 0 0 0 AT_SYMLINK_NOFOLLOW)
    (let ((st (lstat temp-file)))
      (delete-file temp-file)
      ;; Note: 'utimensat' does not change 'ctime'.
      (list (stat:mtime st) (stat:atime st)))))

(test-assert "swapon, ENOSYS/ENOENT/EPERM"
  (catch 'system-error
    (lambda ()
      (swapon "/does-not-exist")
      #f)
    (lambda args
      (memv (system-error-errno args) (list EPERM ENOENT ENOSYS)))))

(test-assert "swapoff, ENOSYS/ENOENT/EINVAL/EPERM"
  (catch 'system-error
    (lambda ()
      (swapoff "/does-not-exist")
      #f)
    (lambda args
      (memv (system-error-errno args) (list EPERM EINVAL ENOENT ENOSYS)))))

(test-assert "mkdtemp!"
  (let* ((tmp (or (getenv "TMPDIR") "/tmp"))
         (dir (mkdtemp! (string-append tmp "/guix-test-XXXXXX"))))
    (and (file-exists? dir)
         (begin
           (rmdir dir)
           #t))))

(test-equal "statfs, ENOENT"
  ENOENT
  (catch 'system-error
    (lambda ()
      (statfs "/does-not-exist"))
    (compose system-error-errno list)))

(test-assert "statfs"
  (let ((fs (statfs "/")))
    (and (file-system? fs)
         (> (file-system-block-size fs) 0)
         (>= (file-system-blocks-available fs) 0)
         (>= (file-system-blocks-free fs)
             (file-system-blocks-available fs)))))

(define (user-namespace pid)
  (string-append "/proc/" (number->string pid) "/ns/user"))

(define perform-container-tests?
  (and (user-namespace-supported?)
       (unprivileged-user-namespace-supported?)))

(unless perform-container-tests?
  (test-skip 1))
(test-assert "clone"
  (match (clone (logior CLONE_NEWUSER SIGCHLD))
    (0 (primitive-exit 42))
    (pid
     ;; Check if user namespaces are different.
     (and (not (equal? (readlink (user-namespace pid))
                       (readlink (user-namespace (getpid)))))
          (match (waitpid pid)
            ((_ . status)
             (= 42 (status:exit-val status))))))))

(unless perform-container-tests?
  (test-skip 1))
(test-assert "setns"
  (match (clone (logior CLONE_NEWUSER SIGCHLD))
    (0 (primitive-exit 0))
    (clone-pid
     (match (pipe)
       ((in . out)
        (match (primitive-fork)
          (0
           (close in)
           ;; Join the user namespace.
           (call-with-input-file (user-namespace clone-pid)
             (lambda (port)
               (setns (port->fdes port) 0)))
           (write 'done out)
           (close out)
           (primitive-exit 0))
          (fork-pid
           (close out)
           ;; Wait for the child process to join the namespace.
           (read in)
           (let ((result (and (equal? (readlink (user-namespace clone-pid))
                                      (readlink (user-namespace fork-pid))))))
             ;; Clean up.
             (waitpid clone-pid)
             (waitpid fork-pid)
             result))))))))

(when (not perform-container-tests?)
  (test-skip 1))
(test-equal "pivot-root"
  'success!
  (match (socketpair AF_UNIX SOCK_STREAM 0)
    ((parent . child)
     (match (clone (logior CLONE_NEWUSER CLONE_NEWNS SIGCHLD))
       (0
        (dynamic-wind
          (const #t)
          (lambda ()
            (close parent)
            (call-with-temporary-directory
             (lambda (root)
               (display "ready\n" child)
               (read child)                       ;wait for "go!"
               (let ((put-old (string-append root "/real-root")))
                 (mount "none" root "tmpfs")
                 (mkdir put-old)
                 (call-with-output-file (string-append root "/test")
                   (lambda (port)
                     (display "testing\n" port)))
                 (pivot-root root put-old)
                 ;; The test file should now be located inside the root directory.
                 (write (and (file-exists? "/test") 'success!) child)
                 (close child)))))
          (lambda ()
            (primitive-exit 0))))
       (pid
        (close child)
        (match (read parent)
          ('ready
           ;; Set up the UID/GID mapping so that we can mkdir on the tmpfs:
           ;; <https://bugzilla.kernel.org/show_bug.cgi?id=183461>.
           (call-with-output-file (format #f "/proc/~d/setgroups" pid)
             (lambda (port)
               (display "deny" port)))
           (call-with-output-file (format #f "/proc/~d/uid_map" pid)
             (lambda (port)
               (format port "0 ~d 1" (getuid))))
           (call-with-output-file (format #f "/proc/~d/gid_map" pid)
             (lambda (port)
               (format port "0 ~d 1" (getgid))))
           (display "go!\n" parent)
           (let ((result (read parent)))
             (close parent)
             (and (zero? (match (waitpid pid)
                           ((_ . status)
                            (status:exit-val status))))
                  result)))))))))

(test-equal "scandir*, ENOENT"
  ENOENT
  (catch 'system-error
    (lambda ()
      (scandir* "/does/not/exist"))
    (lambda args
      (system-error-errno args))))

(test-equal "scandir*, ASCII file names"
  (scandir (dirname (search-path %load-path "guix/base32.scm"))
           (const #t) string<?)
  (match (scandir* (dirname (search-path %load-path "guix/base32.scm")))
    (((names . properties) ...)
     names)))

(test-equal "scandir*, UTF-8 file names"
  '("." ".." "α" "λ")
  (call-with-temporary-directory
   (lambda (directory)
     ;; Wrap 'creat' to make sure that we really pass a UTF-8-encoded file
     ;; name to the system call.
     (let ((creat (pointer->procedure int
                                      (dynamic-func "creat" (dynamic-link))
                                      (list '* int))))
       (creat (string->pointer (string-append directory "/α")
                               "UTF-8")
              #o644)
       (creat (string->pointer (string-append directory "/λ")
                               "UTF-8")
              #o644)
       (let ((locale (setlocale LC_ALL)))
         (dynamic-wind
           (lambda ()
             ;; Make sure that even in a C locale we get the right result.
             (setlocale LC_ALL "C"))
           (lambda ()
             (match (scandir* directory)
               (((names . properties) ...)
                names)))
           (lambda ()
             (setlocale LC_ALL locale))))))))

(test-assert "scandir*, properties"
  (let ((directory (dirname (search-path %load-path "guix/base32.scm"))))
    (every (lambda (entry name)
             (match entry
               ((name2 . properties)
                (and (string=? name2 name)
                     (let* ((full  (string-append directory "/" name))
                            (stat  (lstat full))
                            (inode (assoc-ref properties 'inode))
                            (type  (assoc-ref properties 'type)))
                       (and (= inode (stat:ino stat))
                            (or (eq? type 'unknown)
                                (eq? type (stat:type stat)))))))))
           (scandir* directory)
           (scandir directory (const #t) string<?))))

(false-if-exception (delete-file temp-file))
(test-assert "getxattr, setxattr"
  (let ((key "user.translator")
        (value "/hurd/pfinet\0")
        (file (open-file temp-file "w0")))
    (catch 'system-error
      (lambda ()
        (setxattr temp-file key value)
        (string=? (getxattr temp-file key) value))
      (lambda args
        ;; Accept ENOTSUP, if the file-system does not support extended user
        ;; attributes.
        (memv (system-error-errno args) (list ENOTSUP))))))

(false-if-exception (delete-file temp-file))
(test-equal "fcntl-flock wait"
  42                                              ; the child's exit status
  (let ((file (open-file temp-file "w0b")))
    ;; Acquire an exclusive lock.
    (fcntl-flock file 'write-lock)
    (match (primitive-fork)
      (0
       (dynamic-wind
         (const #t)
         (lambda ()
           ;; Reopen FILE read-only so we can have a read lock.
           (let ((file (open-file temp-file "r0b")))
             ;; Wait until we can acquire the lock.
             (fcntl-flock file 'read-lock)
             (primitive-exit (read file)))
           (primitive-exit 1))
         (lambda ()
           (primitive-exit 2))))
      (pid
       ;; Write garbage and wait.
       (display "hello, world!"  file)
       (force-output file)
       (sleep 1)

       ;; Write the real answer.
       (seek file 0 SEEK_SET)
       (truncate-file file 0)
       (write 42 file)
       (force-output file)

       ;; Unlock, which should let the child continue.
       (fcntl-flock file 'unlock)

       (match (waitpid pid)
         ((_  . status)
          (let ((result (status:exit-val status)))
            (close-port file)
            result)))))))

(test-equal "fcntl-flock non-blocking"
  EAGAIN                                          ; the child's exit status
  (match (pipe)
    ((input . output)
     (match (primitive-fork)
       (0
        (dynamic-wind
          (const #t)
          (lambda ()
            (close-port output)

            ;; Wait for the green light.
            (read-char input)

            ;; Open FILE read-only so we can have a read lock.
            (let ((file (open-file temp-file "w0")))
              (catch 'flock-error
                (lambda ()
                  ;; This attempt should throw EAGAIN.
                  (fcntl-flock file 'write-lock #:wait? #f))
                (lambda (key errno)
                  (primitive-exit (pk 'errno errno)))))
            (primitive-exit -1))
          (lambda ()
            (primitive-exit -2))))
       (pid
        (close-port input)
        (let ((file (open-file temp-file "w0")))
          ;; Acquire an exclusive lock.
          (fcntl-flock file 'write-lock)

          ;; Tell the child to continue.
          (write 'green-light output)
          (force-output output)

          (match (waitpid pid)
            ((_  . status)
             (let ((result (status:exit-val status)))
               (fcntl-flock file 'unlock)
               (close-port file)
               result)))))))))

(test-equal "set-thread-name"
  "Syscall Test"
  (let ((name (thread-name)))
    (set-thread-name "Syscall Test")
    (let ((new-name (thread-name)))
      (set-thread-name name)
      new-name)))

(test-assert "all-network-interface-names"
  (match (all-network-interface-names)
    (((? string? names) ..1)
     (member "lo" names))))

(test-assert "network-interface-names"
  (match (remove (lambda (interface)
                   ;; Ignore interface aliases since they don't show up in
                   ;; (all-network-interface-names).
                   (string-contains interface ":"))
                 (network-interface-names))
    (((? string? names) ..1)
     (lset<= string=? names (all-network-interface-names)))))

(test-assert "network-interface-flags"
  (let* ((sock  (socket AF_INET SOCK_STREAM 0))
         (flags (network-interface-flags sock "lo")))
    (close-port sock)
    (and (not (zero? (logand flags IFF_LOOPBACK)))
         (not (zero? (logand flags IFF_UP))))))

(test-equal "loopback-network-interface?"
  ENODEV
  (and (loopback-network-interface? "lo")
       (catch 'system-error
         (lambda ()
           (loopback-network-interface? "nonexistent")
           #f)
         (lambda args
           (system-error-errno args)))))

(test-equal "loopback-network-interface-running?"
  ENODEV
  (and (network-interface-running? "lo")
       (catch 'system-error
         (lambda ()
           (network-interface-running? "nonexistent")
           #f)
         (lambda args
           (system-error-errno args)))))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-flags"
  (let ((sock (socket AF_INET SOCK_STREAM 0)))
    (catch 'system-error
      (lambda ()
        (set-network-interface-flags sock "lo" IFF_UP))
      (lambda args
        (close-port sock)
        ;; We get EPERM with Linux 3.18ish and EACCES with 2.6.32.
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "network-interface-address lo"
  (make-socket-address AF_INET (inet-pton AF_INET "127.0.0.1") 0)
  (let* ((sock (socket AF_INET SOCK_STREAM 0))
         (addr (network-interface-address sock "lo")))
    (close-port sock)
    addr))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-address"
  (let ((sock (socket AF_INET SOCK_STREAM 0)))
    (catch 'system-error
      (lambda ()
        (set-network-interface-address sock "nonexistent"
                                       (make-socket-address
                                        AF_INET
                                        (inet-pton AF_INET "127.12.14.15")
                                        0)))
      (lambda args
        (close-port sock)
        ;; We get EPERM with Linux 3.18ish and EACCES with 2.6.32.
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "network-interface-netmask lo"
  (make-socket-address AF_INET (inet-pton AF_INET "255.0.0.0") 0)
  (let* ((sock (socket AF_INET SOCK_STREAM 0))
         (addr (network-interface-netmask sock "lo")))
    (close-port sock)
    addr))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-netmask"
  (let ((sock (socket AF_INET SOCK_STREAM 0)))
    (catch 'system-error
      (lambda ()
        (set-network-interface-netmask sock "nonexistent"
                                       (make-socket-address
                                        AF_INET
                                        (inet-pton AF_INET "255.0.0.0")
                                        0)))
      (lambda args
        (close-port sock)
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "network-interfaces returns one or more interfaces"
  '(#t #t #t)
  (match (network-interfaces)
    ((interfaces ..1)
     (list (every interface? interfaces)
           (every string? (map interface-name interfaces))
           (every (lambda (sockaddr)
                    ;; Sometimes interfaces have no associated address.
                    (or (vector? sockaddr)
                        (not sockaddr)))
                  (map interface-address interfaces))))))

(test-equal "network-interfaces returns \"lo\""
  (list #t (make-socket-address AF_INET (inet-pton AF_INET "127.0.0.1") 0))
  (match (filter (lambda (interface)
                   (string=? "lo" (interface-name interface)))
                 (network-interfaces))
    ((loopbacks ..1)
     (list (every (lambda (lo)
                    (not (zero? (logand IFF_LOOPBACK (interface-flags lo)))))
                  loopbacks)
           (match (find (lambda (lo)
                          (= AF_INET (sockaddr:fam (interface-address lo))))
                        loopbacks)
             (#f #f)
             (lo (interface-address lo)))))))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "add-network-route/gateway"
  (let ((sock    (socket AF_INET SOCK_STREAM 0))
        (gateway (make-socket-address AF_INET
                                      (inet-pton AF_INET "192.168.0.1")
                                      0)))
    (catch 'system-error
      (lambda ()
        (add-network-route/gateway sock gateway))
      (lambda args
        (close-port sock)
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "delete-network-route"
  (let ((sock        (socket AF_INET SOCK_STREAM 0))
        (destination (make-socket-address AF_INET INADDR_ANY 0)))
    (catch 'system-error
      (lambda ()
        (delete-network-route sock destination))
      (lambda args
        (close-port sock)
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "tcgetattr ENOTTY"
  ENOTTY
  (catch 'system-error
    (lambda ()
      (call-with-input-file "/dev/null"
        (lambda (port)
          (tcgetattr (fileno port)))))
    (compose system-error-errno list)))

(test-skip (if (and (file-exists? "/proc/self/fd/0")
                    (string-prefix? "/dev/pts/" (readlink "/proc/self/fd/0")))
               0
               2))

(test-assert "tcgetattr"
  (let ((termios (tcgetattr 0)))
    (and (termios? termios)
         (> (termios-input-speed termios) 0)
         (> (termios-output-speed termios) 0))))

(test-assert "tcsetattr"
  (let ((first (tcgetattr 0)))
    (tcsetattr 0 (tcsetattr-action TCSANOW) first)
    (equal? first (tcgetattr 0))))

(test-assert "terminal-window-size ENOTTY"
  (call-with-input-file "/dev/null"
    (lambda (port)
      (catch 'system-error
        (lambda ()
          (terminal-window-size port))
        (lambda args
          ;; Accept EINVAL, which some old Linux versions might return.
          (memv (system-error-errno args)
                (list ENOTTY EINVAL)))))))

(test-assert "terminal-columns"
  (> (terminal-columns) 0))

(test-assert "terminal-columns non-file port"
  (> (terminal-columns (open-input-string "Join us now, share the software!"))
     0))

(test-assert "terminal-rows"
  (> (terminal-rows) 0))

(test-equal "terminal-string-width English"
  5
  (terminal-string-width "hello"))

(test-equal "terminal-string-width Japanese"
  6
  (terminal-string-width "今日は"))

(test-assert "openpty"
  (let ((head inferior (openpty)))
    (and (integer? head) (integer? inferior)
         (let ((port (fdopen inferior "r+0")))
           (and (isatty? port)
                (begin
                  (close-port port)
                  (close-fdes head)
                  #t))))))

(test-equal "openpty + login-tty"
  '(hello world)
  (let ((head inferior (openpty)))
    (match (primitive-fork)
      (0
       (dynamic-wind
         (const #t)
         (lambda ()
           (setvbuf (current-input-port) 'none)
           (close-fdes head)
           (login-tty inferior)
           (write (read))
           (read))                          ;this gets EIO when HEAD is closed
         (lambda ()
           (primitive-_exit 42))))
      (pid
       (close-fdes inferior)
       (let ((head (fdopen head "r+0")))
         (write '(hello world) head)
         (let ((result (read head)))
           (close-port head)
           (waitpid pid)
           result))))))

(test-assert "utmpx-entries"
  (match (utmpx-entries)
    (((? utmpx? entries) ...)
     (every (lambda (entry)
              (match (utmpx-user entry)
                ((? string?)
                 ;; Ensure we have a valid PID for those entries where it
                 ;; makes sense.
                 (or (not (memv (utmpx-login-type entry)
                                (list (login-type INIT_PROCESS)
                                      (login-type LOGIN_PROCESS)
                                      (login-type USER_PROCESS))))
                     (> (utmpx-pid entry) 0)))
                (#f                               ;might be DEAD_PROCESS
                 #t)))
            entries))))

(test-assert "read-utmpx, EOF"
  (eof-object? (read-utmpx (%make-void-port "r"))))

(unless (access? "/var/run/utmpx" O_RDONLY)
  (test-skip 1))
(test-assert "read-utmpx"
  (let ((result (call-with-input-file "/var/run/utmpx" read-utmpx)))
    (or (utmpx? result) (eof-object? result))))

(when (zero? (getuid))
  (test-skip 1))
(test-equal "add-to-entropy-count"
  EPERM
  (call-with-output-file "/dev/urandom"
    (lambda (port)
      (catch 'system-error
        (lambda ()
          (add-to-entropy-count port 77)
          #f)
        (lambda args
          (system-error-errno args))))))

(test-end)

(false-if-exception (delete-file temp-file))