Commit | Line | Data |
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29fa45f4 | 1 | ;;; GNU Guix --- Functional package management for GNU |
1d84d7bf | 2 | ;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org> |
577c02eb | 3 | ;;; Copyright © 2015 David Thompson <davet@gnu.org> |
4f8cede0 | 4 | ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org> |
8336df06 | 5 | ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> |
29fa45f4 LC |
6 | ;;; |
7 | ;;; This file is part of GNU Guix. | |
8 | ;;; | |
9 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
10 | ;;; under the terms of the GNU General Public License as published by | |
11 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
12 | ;;; your option) any later version. | |
13 | ;;; | |
14 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
15 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;;; GNU General Public License for more details. | |
18 | ;;; | |
19 | ;;; You should have received a copy of the GNU General Public License | |
20 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
21 | ||
22 | (define-module (guix build syscalls) | |
23 | #:use-module (system foreign) | |
1ab9e483 | 24 | #:use-module (system base target) ;for cross-compilation support |
29fa45f4 | 25 | #:use-module (rnrs bytevectors) |
3483f004 | 26 | #:autoload (ice-9 binary-ports) (get-bytevector-n) |
29fa45f4 | 27 | #:use-module (srfi srfi-1) |
e7f5691d LC |
28 | #:use-module (srfi srfi-9) |
29 | #:use-module (srfi srfi-9 gnu) | |
26ffb693 | 30 | #:use-module (srfi srfi-11) |
15030972 | 31 | #:use-module (srfi srfi-19) |
fa73c193 | 32 | #:use-module (srfi srfi-26) |
29fa45f4 | 33 | #:use-module (ice-9 rdelim) |
4d54785c | 34 | #:use-module (ice-9 regex) |
29fa45f4 | 35 | #:use-module (ice-9 match) |
17a4d344 | 36 | #:use-module (ice-9 ftw) |
26ffb693 | 37 | #:export (MS_RDONLY |
577c02eb DT |
38 | MS_NOSUID |
39 | MS_NODEV | |
40 | MS_NOEXEC | |
29fa45f4 LC |
41 | MS_REMOUNT |
42 | MS_BIND | |
43 | MS_MOVE | |
577c02eb | 44 | MS_STRICTATIME |
b16d138a DT |
45 | MNT_FORCE |
46 | MNT_DETACH | |
47 | MNT_EXPIRE | |
48 | UMOUNT_NOFOLLOW | |
ea982704 | 49 | restart-on-EINTR |
ccea821b | 50 | mount-points |
715fc9d4 LC |
51 | swapon |
52 | swapoff | |
a1f70878 LC |
53 | |
54 | file-system? | |
55 | file-system-type | |
56 | file-system-block-size | |
57 | file-system-block-count | |
58 | file-system-blocks-free | |
59 | file-system-blocks-available | |
60 | file-system-file-count | |
61 | file-system-free-file-nodes | |
62 | file-system-identifier | |
63 | file-system-maximum-name-length | |
64 | file-system-fragment-size | |
200dac06 | 65 | file-system-mount-flags |
a1f70878 | 66 | statfs |
65f224dc | 67 | free-disk-space |
a1f70878 | 68 | |
7585016f | 69 | processes |
b4abdeb6 | 70 | mkdtemp! |
1752a17a | 71 | fdatasync |
df3ce5c1 | 72 | pivot-root |
fa73c193 | 73 | scandir* |
4e0ea3eb | 74 | fcntl-flock |
973eea34 | 75 | |
aa401f9b LC |
76 | set-thread-name |
77 | thread-name | |
78 | ||
ee78d024 DT |
79 | CLONE_CHILD_CLEARTID |
80 | CLONE_CHILD_SETTID | |
8950ed11 DT |
81 | CLONE_NEWNS |
82 | CLONE_NEWUTS | |
83 | CLONE_NEWIPC | |
84 | CLONE_NEWUSER | |
85 | CLONE_NEWPID | |
86 | CLONE_NEWNET | |
87 | clone | |
43ace6ea | 88 | setns |
8950ed11 | 89 | |
3ca33769 LC |
90 | PF_PACKET |
91 | AF_PACKET | |
b89e7405 LC |
92 | all-network-interface-names |
93 | network-interface-names | |
67e5f3b7 | 94 | network-interface-netmask |
0bc6fe32 | 95 | network-interface-running? |
c9bf64d6 LC |
96 | loopback-network-interface? |
97 | network-interface-address | |
67e5f3b7 | 98 | set-network-interface-netmask |
6944fdbd | 99 | set-network-interface-up |
e7f5691d | 100 | configure-network-interface |
9e38e3cf LC |
101 | add-network-route/gateway |
102 | delete-network-route | |
e7f5691d LC |
103 | |
104 | interface? | |
105 | interface-name | |
106 | interface-flags | |
107 | interface-address | |
108 | interface-netmask | |
109 | interface-broadcast-address | |
29ff6d9f LC |
110 | network-interfaces |
111 | ||
ae4ff9f3 LC |
112 | termios? |
113 | termios-input-flags | |
114 | termios-output-flags | |
115 | termios-control-flags | |
116 | termios-local-flags | |
117 | termios-line-discipline | |
118 | termios-control-chars | |
119 | termios-input-speed | |
120 | termios-output-speed | |
121 | local-flags | |
45c32bd7 | 122 | input-flags |
a8f3424b | 123 | tcsetattr-action |
ae4ff9f3 LC |
124 | tcgetattr |
125 | tcsetattr | |
126 | ||
29ff6d9f LC |
127 | window-size? |
128 | window-size-rows | |
129 | window-size-columns | |
130 | window-size-x-pixels | |
131 | window-size-y-pixels | |
132 | terminal-window-size | |
15030972 LC |
133 | terminal-columns |
134 | ||
135 | utmpx? | |
136 | utmpx-login-type | |
137 | utmpx-pid | |
138 | utmpx-line | |
139 | utmpx-id | |
140 | utmpx-user | |
141 | utmpx-host | |
142 | utmpx-termination-status | |
143 | utmpx-exit-status | |
144 | utmpx-session-id | |
145 | utmpx-time | |
146 | utmpx-address | |
147 | login-type | |
3483f004 LC |
148 | utmpx-entries |
149 | (read-utmpx-from-port . read-utmpx))) | |
29fa45f4 LC |
150 | |
151 | ;;; Commentary: | |
152 | ;;; | |
153 | ;;; This module provides bindings to libc's syscall wrappers. It uses the | |
8336df06 MO |
154 | ;;; FFI, and thus requires a dynamically-linked Guile. |
155 | ;;; | |
156 | ;;; Some syscalls are already defined in statically-linked Guile by applying | |
157 | ;;; 'guile-linux-syscalls.patch'. | |
158 | ;;; | |
159 | ;;; Visibility of syscall's symbols shared between this module and static Guile | |
160 | ;;; is a bit delicate. It is handled by 'define-as-needed' macro. | |
161 | ;;; | |
162 | ;;; This macro is used to export symbols in dynamic Guile context, and to | |
163 | ;;; re-export them in static Guile context. | |
164 | ;;; | |
165 | ;;; This way, even if they don't appear in #:export list, it is safe to use | |
166 | ;;; syscalls from this module in static or dynamic Guile context. | |
29fa45f4 LC |
167 | ;;; |
168 | ;;; Code: | |
169 | ||
73f38d5f LC |
170 | \f |
171 | ;;; | |
172 | ;;; Packed structures. | |
173 | ;;; | |
174 | ||
175 | (define-syntax sizeof* | |
176 | ;; XXX: This duplicates 'compile-time-value'. | |
00cd4197 | 177 | (syntax-rules (int128 array) |
73f38d5f LC |
178 | ((_ int128) |
179 | 16) | |
00cd4197 LC |
180 | ((_ (array type n)) |
181 | (* (sizeof* type) n)) | |
73f38d5f LC |
182 | ((_ type) |
183 | (let-syntax ((v (lambda (s) | |
184 | (let ((val (sizeof type))) | |
185 | (syntax-case s () | |
186 | (_ val)))))) | |
187 | v)))) | |
188 | ||
189 | (define-syntax alignof* | |
190 | ;; XXX: This duplicates 'compile-time-value'. | |
00cd4197 | 191 | (syntax-rules (int128 array) |
73f38d5f LC |
192 | ((_ int128) |
193 | 16) | |
00cd4197 LC |
194 | ((_ (array type n)) |
195 | (alignof* type)) | |
73f38d5f LC |
196 | ((_ type) |
197 | (let-syntax ((v (lambda (s) | |
198 | (let ((val (alignof type))) | |
199 | (syntax-case s () | |
200 | (_ val)))))) | |
201 | v)))) | |
202 | ||
203 | (define-syntax align ;as found in (system foreign) | |
204 | (syntax-rules (~) | |
205 | "Add to OFFSET whatever it takes to get proper alignment for TYPE." | |
206 | ((_ offset (type ~ endianness)) | |
207 | (align offset type)) | |
208 | ((_ offset type) | |
209 | (1+ (logior (1- offset) (1- (alignof* type))))))) | |
210 | ||
211 | (define-syntax type-size | |
212 | (syntax-rules (~) | |
213 | ((_ (type ~ order)) | |
214 | (sizeof* type)) | |
215 | ((_ type) | |
216 | (sizeof* type)))) | |
217 | ||
785cfa87 LC |
218 | (define-syntax struct-alignment |
219 | (syntax-rules () | |
220 | "Compute the alignment for the aggregate made of TYPES at OFFSET. The | |
221 | result is the alignment of the \"most strictly aligned component\"." | |
222 | ((_ offset types ...) | |
223 | (max (align offset types) ...)))) | |
224 | ||
225 | (define-syntax struct-size | |
226 | (syntax-rules () | |
227 | "Return the size in bytes of the structure made of TYPES." | |
228 | ((_ offset (types-processed ...)) | |
229 | ;; The SysV ABI P.S. says: "Aggregates (structures and arrays) and unions | |
230 | ;; assume the alignment of their most strictly aligned component." As an | |
231 | ;; example, a struct such as "int32, int16" has size 8, not 6. | |
232 | (1+ (logior (1- offset) | |
233 | (1- (struct-alignment offset types-processed ...))))) | |
234 | ((_ offset (types-processed ...) type0 types ...) | |
235 | (struct-size (+ (type-size type0) (align offset type0)) | |
236 | (type0 types-processed ...) | |
237 | types ...)))) | |
238 | ||
73f38d5f | 239 | (define-syntax write-type |
f43714e6 | 240 | (syntax-rules (~ array *) |
73f38d5f LC |
241 | ((_ bv offset (type ~ order) value) |
242 | (bytevector-uint-set! bv offset value | |
243 | (endianness order) (sizeof* type))) | |
00cd4197 LC |
244 | ((_ bv offset (array type n) value) |
245 | (let loop ((i 0) | |
246 | (value value) | |
247 | (o offset)) | |
248 | (unless (= i n) | |
249 | (match value | |
250 | ((head . tail) | |
251 | (write-type bv o type head) | |
252 | (loop (+ 1 i) tail (+ o (sizeof* type)))))))) | |
f43714e6 LC |
253 | ((_ bv offset '* value) |
254 | (bytevector-uint-set! bv offset (pointer-address value) | |
255 | (native-endianness) (sizeof* '*))) | |
73f38d5f LC |
256 | ((_ bv offset type value) |
257 | (bytevector-uint-set! bv offset value | |
258 | (native-endianness) (sizeof* type))))) | |
259 | ||
260 | (define-syntax write-types | |
261 | (syntax-rules () | |
262 | ((_ bv offset () ()) | |
263 | #t) | |
264 | ((_ bv offset (type0 types ...) (field0 fields ...)) | |
265 | (begin | |
266 | (write-type bv (align offset type0) type0 field0) | |
267 | (write-types bv | |
268 | (+ (align offset type0) (type-size type0)) | |
269 | (types ...) (fields ...)))))) | |
270 | ||
271 | (define-syntax read-type | |
00cd4197 | 272 | (syntax-rules (~ array quote *) |
73f38d5f LC |
273 | ((_ bv offset '*) |
274 | (make-pointer (bytevector-uint-ref bv offset | |
275 | (native-endianness) | |
276 | (sizeof* '*)))) | |
277 | ((_ bv offset (type ~ order)) | |
278 | (bytevector-uint-ref bv offset | |
279 | (endianness order) (sizeof* type))) | |
00cd4197 LC |
280 | ((_ bv offset (array type n)) |
281 | (unfold (lambda (i) (= i n)) | |
282 | (lambda (i) | |
283 | (read-type bv (+ offset (* i (sizeof* type))) type)) | |
284 | 1+ | |
285 | 0)) | |
73f38d5f LC |
286 | ((_ bv offset type) |
287 | (bytevector-uint-ref bv offset | |
288 | (native-endianness) (sizeof* type))))) | |
289 | ||
290 | (define-syntax read-types | |
291 | (syntax-rules () | |
292 | ((_ return bv offset () (values ...)) | |
293 | (return values ...)) | |
294 | ((_ return bv offset (type0 types ...) (values ...)) | |
295 | (read-types return | |
296 | bv | |
297 | (+ (align offset type0) (type-size type0)) | |
298 | (types ...) | |
299 | (values ... (read-type bv | |
300 | (align offset type0) | |
301 | type0)))))) | |
302 | ||
8eb790f3 LC |
303 | (define-syntax define-c-struct-macro |
304 | (syntax-rules () | |
305 | "Define NAME as a macro that can be queried to get information about the C | |
306 | struct it represents. In particular: | |
307 | ||
308 | (NAME field-offset FIELD) | |
309 | ||
310 | returns the offset in bytes of FIELD within the C struct represented by NAME." | |
311 | ((_ name ((fields types) ...)) | |
312 | (define-c-struct-macro name | |
313 | (fields ...) 0 () | |
314 | ((fields types) ...))) | |
315 | ((_ name (fields ...) offset (clauses ...) ((field type) rest ...)) | |
316 | (define-c-struct-macro name | |
317 | (fields ...) | |
318 | (+ (align offset type) (type-size type)) | |
319 | (clauses ... ((_ field-offset field) (align offset type))) | |
320 | (rest ...))) | |
321 | ((_ name (fields ...) offset (clauses ...) ()) | |
322 | (define-syntax name | |
323 | (syntax-rules (field-offset fields ...) | |
324 | clauses ...))))) | |
325 | ||
73f38d5f LC |
326 | (define-syntax define-c-struct |
327 | (syntax-rules () | |
785cfa87 LC |
328 | "Define SIZE as the size in bytes of the C structure made of FIELDS. READ |
329 | as a deserializer and WRITE! as a serializer for the C structure with the | |
330 | given TYPES. READ uses WRAP-FIELDS to return its value." | |
331 | ((_ name size wrap-fields read write! (fields types) ...) | |
73f38d5f | 332 | (begin |
8eb790f3 LC |
333 | (define-c-struct-macro name |
334 | ((fields types) ...)) | |
785cfa87 LC |
335 | (define size |
336 | (struct-size 0 () types ...)) | |
73f38d5f LC |
337 | (define (write! bv offset fields ...) |
338 | (write-types bv offset (types ...) (fields ...))) | |
f77863a0 | 339 | (define* (read bv #:optional (offset 0)) |
73f38d5f LC |
340 | (read-types wrap-fields bv offset (types ...) ())))))) |
341 | ||
8eb790f3 LC |
342 | (define-syntax-rule (c-struct-field-offset type field) |
343 | "Return the offset in BYTES of FIELD within TYPE, where TYPE is a C struct | |
344 | defined with 'define-c-struct' and FIELD is a field identifier. An | |
345 | expansion-time error is raised if FIELD does not exist in TYPE." | |
346 | (type field-offset field)) | |
347 | ||
73f38d5f LC |
348 | \f |
349 | ;;; | |
350 | ;;; FFI. | |
351 | ;;; | |
352 | ||
ea982704 LC |
353 | (define (call-with-restart-on-EINTR thunk) |
354 | (let loop () | |
355 | (catch 'system-error | |
356 | thunk | |
357 | (lambda args | |
358 | (if (= (system-error-errno args) EINTR) | |
359 | (loop) | |
360 | (apply throw args)))))) | |
361 | ||
362 | (define-syntax-rule (restart-on-EINTR expr) | |
363 | "Evaluate EXPR and restart upon EINTR. Return the value of EXPR." | |
364 | (call-with-restart-on-EINTR (lambda () expr))) | |
365 | ||
4f8cede0 | 366 | (define (syscall->procedure return-type name argument-types) |
26ffb693 LC |
367 | "Return a procedure that wraps the C function NAME using the dynamic FFI, |
368 | and that returns two values: NAME's return value, and errno. | |
369 | ||
4f8cede0 MW |
370 | If an error occurs while creating the binding, defer the error report until |
371 | the returned procedure is called." | |
372 | (catch #t | |
373 | (lambda () | |
374 | (let ((ptr (dynamic-func name (dynamic-link)))) | |
26ffb693 | 375 | ;; The #:return-errno? facility was introduced in Guile 2.0.12. |
1d84d7bf LC |
376 | (pointer->procedure return-type ptr argument-types |
377 | #:return-errno? #t))) | |
4f8cede0 MW |
378 | (lambda args |
379 | (lambda _ | |
380 | (error (format #f "~a: syscall->procedure failed: ~s" | |
381 | name args)))))) | |
382 | ||
8336df06 MO |
383 | (define-syntax define-as-needed |
384 | (syntax-rules () | |
385 | "Define VARIABLE. If VARIABLE already exists in (guile) then re-export it, | |
386 | otherwise export the newly-defined VARIABLE." | |
387 | ((_ (proc args ...) body ...) | |
388 | (define-as-needed proc (lambda* (args ...) body ...))) | |
389 | ((_ variable value) | |
390 | (begin | |
391 | (when (module-defined? the-scm-module 'variable) | |
392 | (re-export variable)) | |
393 | ||
394 | (define variable | |
395 | (if (module-defined? the-scm-module 'variable) | |
396 | (module-ref the-scm-module 'variable) | |
397 | value)) | |
398 | ||
399 | (unless (module-defined? the-scm-module 'variable) | |
400 | (export variable)))))) | |
401 | ||
73f38d5f LC |
402 | \f |
403 | ;;; | |
404 | ;;; File systems. | |
405 | ;;; | |
406 | ||
29fa45f4 LC |
407 | (define (augment-mtab source target type options) |
408 | "Augment /etc/mtab with information about the given mount point." | |
409 | (let ((port (open-file "/etc/mtab" "a"))) | |
410 | (format port "~a ~a ~a ~a 0 0~%" | |
411 | source target type (or options "rw")) | |
412 | (close-port port))) | |
413 | ||
414 | (define (read-mtab port) | |
415 | "Read an mtab-formatted file from PORT, returning a list of tuples." | |
416 | (let loop ((result '())) | |
417 | (let ((line (read-line port))) | |
418 | (if (eof-object? line) | |
419 | (reverse result) | |
420 | (loop (cons (string-tokenize line) result)))))) | |
421 | ||
422 | (define (remove-from-mtab target) | |
423 | "Remove mount point TARGET from /etc/mtab." | |
424 | (define entries | |
425 | (remove (match-lambda | |
426 | ((device mount-point type options freq passno) | |
427 | (string=? target mount-point)) | |
428 | (_ #f)) | |
cd4a3cb3 | 429 | (call-with-input-file "/etc/mtab" read-mtab))) |
29fa45f4 | 430 | |
cd4a3cb3 | 431 | (call-with-output-file "/etc/mtab" |
29fa45f4 LC |
432 | (lambda (port) |
433 | (for-each (match-lambda | |
434 | ((device mount-point type options freq passno) | |
435 | (format port "~a ~a ~a ~a ~a ~a~%" | |
436 | device mount-point type options freq passno))) | |
437 | entries)))) | |
438 | ||
439 | ;; Linux mount flags, from libc's <sys/mount.h>. | |
577c02eb DT |
440 | (define MS_RDONLY 1) |
441 | (define MS_NOSUID 2) | |
442 | (define MS_NODEV 4) | |
443 | (define MS_NOEXEC 8) | |
444 | (define MS_REMOUNT 32) | |
445 | (define MS_BIND 4096) | |
446 | (define MS_MOVE 8192) | |
447 | (define MS_STRICTATIME 16777216) | |
29fa45f4 | 448 | |
b16d138a DT |
449 | (define MNT_FORCE 1) |
450 | (define MNT_DETACH 2) | |
451 | (define MNT_EXPIRE 4) | |
452 | (define UMOUNT_NOFOLLOW 8) | |
453 | ||
7df4d346 MO |
454 | (define-as-needed (mount source target type |
455 | #:optional (flags 0) options | |
f91fcd9c | 456 | #:key (update-mtab? #f)) |
7df4d346 | 457 | "Mount device SOURCE on TARGET as a file system TYPE. |
f91fcd9c MO |
458 | Optionally, FLAGS may be a bitwise-or of the MS_* <sys/mount.h> |
459 | constants, and OPTIONS may be a string. When FLAGS contains | |
460 | MS_REMOUNT, SOURCE and TYPE are ignored. When UPDATE-MTAB? is true, | |
461 | update /etc/mtab. Raise a 'system-error' exception on error." | |
7df4d346 MO |
462 | ;; XXX: '#:update-mtab?' is not implemented by core 'mount'. |
463 | (let ((proc (syscall->procedure int "mount" `(* * * ,unsigned-long *)))) | |
464 | (let-values (((ret err) | |
465 | (proc (if source | |
466 | (string->pointer source) | |
467 | %null-pointer) | |
468 | (string->pointer target) | |
469 | (if type | |
470 | (string->pointer type) | |
471 | %null-pointer) | |
472 | flags | |
473 | (if options | |
474 | (string->pointer options) | |
475 | %null-pointer)))) | |
476 | (unless (zero? ret) | |
477 | (throw 'system-error "mount" "mount ~S on ~S: ~A" | |
478 | (list source target (strerror err)) | |
479 | (list err))) | |
480 | (when update-mtab? | |
481 | (augment-mtab source target type options))))) | |
482 | ||
483 | (define-as-needed (umount target | |
484 | #:optional (flags 0) | |
485 | #:key (update-mtab? #f)) | |
486 | "Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_* | |
29fa45f4 | 487 | constants from <sys/mount.h>." |
7df4d346 MO |
488 | ;; XXX: '#:update-mtab?' is not implemented by core 'umount'. |
489 | (let ((proc (syscall->procedure int "umount2" `(* ,int)))) | |
490 | (let-values (((ret err) | |
491 | (proc (string->pointer target) flags))) | |
492 | (unless (zero? ret) | |
493 | (throw 'system-error "umount" "~S: ~A" | |
494 | (list target (strerror err)) | |
495 | (list err))) | |
496 | (when update-mtab? | |
497 | (remove-from-mtab target))))) | |
29fa45f4 | 498 | |
ccea821b LC |
499 | (define (mount-points) |
500 | "Return the mounts points for currently mounted file systems." | |
501 | (call-with-input-file "/proc/mounts" | |
502 | (lambda (port) | |
503 | (let loop ((result '())) | |
504 | (let ((line (read-line port))) | |
505 | (if (eof-object? line) | |
506 | (reverse result) | |
507 | (match (string-tokenize line) | |
508 | ((source mount-point _ ...) | |
509 | (loop (cons mount-point result)))))))))) | |
510 | ||
715fc9d4 | 511 | (define swapon |
4f8cede0 | 512 | (let ((proc (syscall->procedure int "swapon" (list '* int)))) |
715fc9d4 LC |
513 | (lambda* (device #:optional (flags 0)) |
514 | "Use the block special device at DEVICE for swapping." | |
26ffb693 LC |
515 | (let-values (((ret err) |
516 | (proc (string->pointer device) flags))) | |
715fc9d4 LC |
517 | (unless (zero? ret) |
518 | (throw 'system-error "swapon" "~S: ~A" | |
519 | (list device (strerror err)) | |
520 | (list err))))))) | |
521 | ||
522 | (define swapoff | |
4f8cede0 | 523 | (let ((proc (syscall->procedure int "swapoff" '(*)))) |
715fc9d4 LC |
524 | (lambda (device) |
525 | "Stop using block special device DEVICE for swapping." | |
26ffb693 | 526 | (let-values (((ret err) (proc (string->pointer device)))) |
715fc9d4 | 527 | (unless (zero? ret) |
60a56db0 | 528 | (throw 'system-error "swapoff" "~S: ~A" |
715fc9d4 LC |
529 | (list device (strerror err)) |
530 | (list err))))))) | |
531 | ||
8336df06 MO |
532 | (define-as-needed RB_AUTOBOOT #x01234567) |
533 | (define-as-needed RB_HALT_SYSTEM #xcdef0123) | |
534 | (define-as-needed RB_ENABLED_CAD #x89abcdef) | |
535 | (define-as-needed RB_DISABLE_CAD 0) | |
536 | (define-as-needed RB_POWER_OFF #x4321fedc) | |
537 | (define-as-needed RB_SW_SUSPEND #xd000fce2) | |
538 | (define-as-needed RB_KEXEC #x45584543) | |
539 | ||
540 | (define-as-needed (reboot #:optional (cmd RB_AUTOBOOT)) | |
541 | (let ((proc (syscall->procedure int "reboot" (list int)))) | |
542 | (let-values (((ret err) (proc cmd))) | |
543 | (unless (zero? ret) | |
544 | (throw 'system-error "reboot" "~S: ~A" | |
545 | (list cmd (strerror err)) | |
546 | (list err)))))) | |
547 | ||
23e525e1 MO |
548 | (define-as-needed (load-linux-module data #:optional (options "")) |
549 | (let ((proc (syscall->procedure int "init_module" | |
550 | (list '* unsigned-long '*)))) | |
551 | (let-values (((ret err) | |
552 | (proc (bytevector->pointer data) | |
553 | (bytevector-length data) | |
554 | (string->pointer options)))) | |
555 | (unless (zero? ret) | |
556 | (throw 'system-error "load-linux-module" "~A" | |
557 | (list (strerror err)) | |
558 | (list err)))))) | |
559 | ||
17a4d344 LC |
560 | (define (kernel? pid) |
561 | "Return #t if PID designates a \"kernel thread\" rather than a normal | |
562 | user-land process." | |
563 | (let ((stat (call-with-input-file (format #f "/proc/~a/stat" pid) | |
564 | (compose string-tokenize read-string)))) | |
565 | ;; See proc.txt in Linux's documentation for the list of fields. | |
566 | (match stat | |
567 | ((pid tcomm state ppid pgrp sid tty_nr tty_pgrp flags min_flt | |
568 | cmin_flt maj_flt cmaj_flt utime stime cutime cstime | |
569 | priority nice num_thread it_real_value start_time | |
570 | vsize rss rsslim | |
571 | (= string->number start_code) (= string->number end_code) _ ...) | |
572 | ;; Got this obscure trick from sysvinit's 'killall5' program. | |
573 | (and (zero? start_code) (zero? end_code)))))) | |
574 | ||
575 | (define (processes) | |
576 | "Return the list of live processes." | |
577 | (sort (filter-map (lambda (file) | |
578 | (let ((pid (string->number file))) | |
579 | (and pid | |
580 | (not (kernel? pid)) | |
581 | pid))) | |
582 | (scandir "/proc")) | |
583 | <)) | |
584 | ||
b4abdeb6 | 585 | (define mkdtemp! |
d1f33ba4 | 586 | (let ((proc (syscall->procedure '* "mkdtemp" '(*)))) |
b4abdeb6 DT |
587 | (lambda (tmpl) |
588 | "Create a new unique directory in the file system using the template | |
589 | string TMPL and return its file name. TMPL must end with 'XXXXXX'." | |
26ffb693 | 590 | (let-values (((result err) (proc (string->pointer tmpl)))) |
b4abdeb6 DT |
591 | (when (null-pointer? result) |
592 | (throw 'system-error "mkdtemp!" "~S: ~A" | |
593 | (list tmpl (strerror err)) | |
594 | (list err))) | |
595 | (pointer->string result))))) | |
596 | ||
1752a17a LC |
597 | (define fdatasync |
598 | (let ((proc (syscall->procedure int "fdatasync" (list int)))) | |
599 | (lambda (port) | |
600 | "Flush buffered output of PORT, an output file port, and then call | |
601 | fdatasync(2) on the underlying file descriptor." | |
602 | (force-output port) | |
26ffb693 LC |
603 | (let*-values (((fd) (fileno port)) |
604 | ((ret err) (proc fd))) | |
1752a17a LC |
605 | (unless (zero? ret) |
606 | (throw 'system-error "fdatasync" "~S: ~A" | |
607 | (list fd (strerror err)) | |
608 | (list err))))))) | |
609 | ||
a1f70878 LC |
610 | |
611 | (define-record-type <file-system> | |
612 | (file-system type block-size blocks blocks-free | |
613 | blocks-available files free-files identifier | |
00cd4197 | 614 | name-length fragment-size mount-flags spare) |
a1f70878 LC |
615 | file-system? |
616 | (type file-system-type) | |
617 | (block-size file-system-block-size) | |
618 | (blocks file-system-block-count) | |
619 | (blocks-free file-system-blocks-free) | |
620 | (blocks-available file-system-blocks-available) | |
621 | (files file-system-file-count) | |
622 | (free-files file-system-free-file-nodes) | |
623 | (identifier file-system-identifier) | |
624 | (name-length file-system-maximum-name-length) | |
625 | (fragment-size file-system-fragment-size) | |
200dac06 | 626 | (mount-flags file-system-mount-flags) |
00cd4197 | 627 | (spare file-system--spare)) |
a1f70878 LC |
628 | |
629 | (define-syntax fsword ;fsword_t | |
630 | (identifier-syntax long)) | |
631 | ||
200dac06 | 632 | (define-c-struct %statfs ;<bits/statfs.h> |
a1f70878 LC |
633 | sizeof-statfs ;slightly overestimated |
634 | file-system | |
635 | read-statfs | |
636 | write-statfs! | |
637 | (type fsword) | |
638 | (block-size fsword) | |
639 | (blocks uint64) | |
640 | (blocks-free uint64) | |
641 | (blocks-available uint64) | |
642 | (files uint64) | |
643 | (free-files uint64) | |
00cd4197 | 644 | (identifier (array int 2)) |
a1f70878 LC |
645 | (name-length fsword) |
646 | (fragment-size fsword) | |
200dac06 | 647 | (mount-flags fsword) |
00cd4197 | 648 | (spare (array fsword 4))) |
a1f70878 LC |
649 | |
650 | (define statfs | |
96f2a432 | 651 | (let ((proc (syscall->procedure int "statfs64" '(* *)))) |
a1f70878 LC |
652 | (lambda (file) |
653 | "Return a <file-system> data structure describing the file system | |
654 | mounted at FILE." | |
26ffb693 LC |
655 | (let*-values (((stat) (make-bytevector sizeof-statfs)) |
656 | ((ret err) (proc (string->pointer file) | |
657 | (bytevector->pointer stat)))) | |
a1f70878 | 658 | (if (zero? ret) |
96f2a432 | 659 | (read-statfs stat) |
a1f70878 LC |
660 | (throw 'system-error "statfs" "~A: ~A" |
661 | (list file (strerror err)) | |
662 | (list err))))))) | |
663 | ||
65f224dc LC |
664 | (define (free-disk-space file) |
665 | "Return the free disk space, in bytes, on the file system that hosts FILE." | |
666 | (let ((fs (statfs file))) | |
667 | (* (file-system-block-size fs) | |
668 | (file-system-blocks-available fs)))) | |
669 | ||
73f38d5f LC |
670 | \f |
671 | ;;; | |
672 | ;;; Containers. | |
673 | ;;; | |
674 | ||
8950ed11 | 675 | ;; Linux clone flags, from linux/sched.h |
ee78d024 DT |
676 | (define CLONE_CHILD_CLEARTID #x00200000) |
677 | (define CLONE_CHILD_SETTID #x01000000) | |
678 | (define CLONE_NEWNS #x00020000) | |
679 | (define CLONE_NEWUTS #x04000000) | |
680 | (define CLONE_NEWIPC #x08000000) | |
681 | (define CLONE_NEWUSER #x10000000) | |
682 | (define CLONE_NEWPID #x20000000) | |
683 | (define CLONE_NEWNET #x40000000) | |
8950ed11 | 684 | |
70dfdd50 LC |
685 | (cond-expand |
686 | (guile-2.2 | |
687 | (define %set-automatic-finalization-enabled?! | |
ef03d8dc LC |
688 | ;; When using a statically-linked Guile, for instance in the initrd, we |
689 | ;; cannot resolve this symbol, but most of the time we don't need it | |
690 | ;; anyway. Thus, delay it. | |
691 | (let ((proc (delay | |
692 | (pointer->procedure int | |
693 | (dynamic-func | |
694 | "scm_set_automatic_finalization_enabled" | |
695 | (dynamic-link)) | |
696 | (list int))))) | |
70dfdd50 LC |
697 | (lambda (enabled?) |
698 | "Switch on or off automatic finalization in a separate thread. | |
699 | Turning finalization off shuts down the finalization thread as a side effect." | |
ef03d8dc | 700 | (->bool ((force proc) (if enabled? 1 0)))))) |
70dfdd50 LC |
701 | |
702 | (define-syntax-rule (without-automatic-finalization exp) | |
703 | "Turn off automatic finalization within the dynamic extent of EXP." | |
704 | (let ((enabled? #t)) | |
705 | (dynamic-wind | |
706 | (lambda () | |
707 | (set! enabled? (%set-automatic-finalization-enabled?! #f))) | |
708 | (lambda () | |
709 | exp) | |
710 | (lambda () | |
711 | (%set-automatic-finalization-enabled?! enabled?)))))) | |
712 | ||
713 | (else | |
714 | (define-syntax-rule (without-automatic-finalization exp) | |
715 | ;; Nothing to do here: Guile 2.0 does not have a separate finalization | |
716 | ;; thread. | |
717 | exp))) | |
718 | ||
8950ed11 | 719 | ;; The libc interface to sys_clone is not useful for Scheme programs, so the |
0e3cc311 LC |
720 | ;; low-level system call is wrapped instead. The 'syscall' function is |
721 | ;; declared in <unistd.h> as a variadic function; in practice, it expects 6 | |
722 | ;; pointer-sized arguments, as shown in, e.g., x86_64/syscall.S. | |
8950ed11 | 723 | (define clone |
4f8cede0 MW |
724 | (let* ((proc (syscall->procedure int "syscall" |
725 | (list long ;sysno | |
726 | unsigned-long ;flags | |
727 | '* '* '* | |
728 | '*))) | |
8950ed11 DT |
729 | ;; TODO: Don't do this. |
730 | (syscall-id (match (utsname:machine (uname)) | |
731 | ("i686" 120) | |
732 | ("x86_64" 56) | |
733 | ("mips64" 5055) | |
4f8cede0 | 734 | ("armv7l" 120) |
7f0bb654 | 735 | ("aarch64" 220) |
4f8cede0 | 736 | (_ #f)))) |
8950ed11 DT |
737 | (lambda (flags) |
738 | "Create a new child process by duplicating the current parent process. | |
739 | Unlike the fork system call, clone accepts FLAGS that specify which resources | |
740 | are shared between the parent and child processes." | |
26ffb693 | 741 | (let-values (((ret err) |
70dfdd50 LC |
742 | ;; Guile 2.2 runs a finalization thread. 'primitive-fork' |
743 | ;; takes care of shutting it down before forking, and we | |
744 | ;; must do the same here. Failing to do that, if the | |
745 | ;; child process calls 'primitive-fork', it will hang | |
746 | ;; while trying to pthread_join the finalization thread | |
747 | ;; since that thread does not exist. | |
748 | (without-automatic-finalization | |
749 | (proc syscall-id flags | |
750 | %null-pointer ;child stack | |
751 | %null-pointer %null-pointer ;ptid & ctid | |
752 | %null-pointer)))) ;unused | |
cf897cba DT |
753 | (if (= ret -1) |
754 | (throw 'system-error "clone" "~d: ~A" | |
755 | (list flags (strerror err)) | |
756 | (list err)) | |
757 | ret))))) | |
8950ed11 | 758 | |
43ace6ea | 759 | (define setns |
39e336b5 DT |
760 | ;; Some systems may be using an old (pre-2.14) version of glibc where there |
761 | ;; is no 'setns' function available. | |
762 | (false-if-exception | |
d1f33ba4 | 763 | (let ((proc (syscall->procedure int "setns" (list int int)))) |
39e336b5 DT |
764 | (lambda (fdes nstype) |
765 | "Reassociate the current process with the namespace specified by FDES, a | |
43ace6ea DT |
766 | file descriptor obtained by opening a /proc/PID/ns/* file. NSTYPE specifies |
767 | which type of namespace the current process may be reassociated with, or 0 if | |
768 | there is no such limitation." | |
26ffb693 | 769 | (let-values (((ret err) (proc fdes nstype))) |
39e336b5 DT |
770 | (unless (zero? ret) |
771 | (throw 'system-error "setns" "~d ~d: ~A" | |
772 | (list fdes nstype (strerror err)) | |
773 | (list err)))))))) | |
43ace6ea | 774 | |
df3ce5c1 | 775 | (define pivot-root |
4f8cede0 | 776 | (let ((proc (syscall->procedure int "pivot_root" (list '* '*)))) |
df3ce5c1 DT |
777 | (lambda (new-root put-old) |
778 | "Change the root file system to NEW-ROOT and move the current root file | |
779 | system to PUT-OLD." | |
26ffb693 LC |
780 | (let-values (((ret err) |
781 | (proc (string->pointer new-root) | |
782 | (string->pointer put-old)))) | |
df3ce5c1 DT |
783 | (unless (zero? ret) |
784 | (throw 'system-error "pivot_root" "~S ~S: ~A" | |
785 | (list new-root put-old (strerror err)) | |
786 | (list err))))))) | |
787 | ||
7585016f | 788 | \f |
fa73c193 LC |
789 | ;;; |
790 | ;;; Opendir & co. | |
791 | ;;; | |
792 | ||
1ab9e483 LC |
793 | (define (file-type->symbol type) |
794 | ;; Convert TYPE to symbols like 'stat:type' does. | |
795 | (cond ((= type DT_REG) 'regular) | |
796 | ((= type DT_LNK) 'symlink) | |
797 | ((= type DT_DIR) 'directory) | |
798 | ((= type DT_FIFO) 'fifo) | |
799 | ((= type DT_CHR) 'char-special) | |
800 | ((= type DT_BLK) 'block-special) | |
801 | ((= type DT_SOCK) 'socket) | |
802 | (else 'unknown))) | |
803 | ||
804 | ;; 'struct dirent64' for GNU/Linux. | |
805 | (define-c-struct %struct-dirent-header/linux | |
806 | sizeof-dirent-header/linux | |
fa73c193 | 807 | (lambda (inode offset length type name) |
1ab9e483 LC |
808 | `((type . ,(file-type->symbol type)) |
809 | (inode . ,inode))) | |
810 | read-dirent-header/linux | |
811 | write-dirent-header!/linux | |
fa73c193 LC |
812 | (inode int64) |
813 | (offset int64) | |
814 | (length unsigned-short) | |
815 | (type uint8) | |
816 | (name uint8)) ;first byte of 'd_name' | |
817 | ||
1ab9e483 LC |
818 | ;; 'struct dirent64' for GNU/Hurd. |
819 | (define-c-struct %struct-dirent-header/hurd | |
820 | sizeof-dirent-header/hurd | |
821 | (lambda (inode length type name-length name) | |
822 | `((type . ,(file-type->symbol type)) | |
823 | (inode . ,inode))) | |
824 | read-dirent-header/hurd | |
825 | write-dirent-header!/hurd | |
826 | (inode int64) | |
827 | (length unsigned-short) | |
828 | (type uint8) | |
829 | (namelen uint8) | |
830 | (name uint8)) | |
831 | ||
832 | (define-syntax define-generic-identifier | |
833 | (syntax-rules (gnu/linux gnu/hurd =>) | |
834 | "Define a generic identifier that adjust to the current GNU variant." | |
835 | ((_ id (gnu/linux => linux) (gnu/hurd => hurd)) | |
836 | (define-syntax id | |
837 | (lambda (s) | |
838 | (syntax-case s () | |
839 | ((_ args (... ...)) | |
840 | (if (string-contains (or (target-type) %host-type) | |
841 | "linux") | |
842 | #'(linux args (... ...)) | |
843 | #'(hurd args (... ...)))) | |
844 | (_ | |
845 | (if (string-contains (or (target-type) %host-type) | |
846 | "linux") | |
847 | #'linux | |
848 | #'hurd)))))))) | |
849 | ||
850 | (define-generic-identifier read-dirent-header | |
851 | (gnu/linux => read-dirent-header/linux) | |
852 | (gnu/hurd => read-dirent-header/hurd)) | |
853 | ||
854 | (define-generic-identifier %struct-dirent-header | |
855 | (gnu/linux => %struct-dirent-header/linux) | |
856 | (gnu/hurd => %struct-dirent-header/hurd)) | |
857 | ||
858 | (define-generic-identifier sizeof-dirent-header | |
859 | (gnu/linux => sizeof-dirent-header/linux) | |
860 | (gnu/hurd => sizeof-dirent-header/hurd)) | |
861 | ||
fa73c193 LC |
862 | ;; Constants for the 'type' field, from <dirent.h>. |
863 | (define DT_UNKNOWN 0) | |
864 | (define DT_FIFO 1) | |
865 | (define DT_CHR 2) | |
866 | (define DT_DIR 4) | |
867 | (define DT_BLK 6) | |
868 | (define DT_REG 8) | |
869 | (define DT_LNK 10) | |
870 | (define DT_SOCK 12) | |
871 | (define DT_WHT 14) | |
872 | ||
873 | (define string->pointer/utf-8 | |
874 | (cut string->pointer <> "UTF-8")) | |
875 | ||
876 | (define pointer->string/utf-8 | |
877 | (cut pointer->string <> <> "UTF-8")) | |
878 | ||
879 | (define opendir* | |
880 | (let ((proc (syscall->procedure '* "opendir" '(*)))) | |
881 | (lambda* (name #:optional (string->pointer string->pointer/utf-8)) | |
882 | (let-values (((ptr err) | |
883 | (proc (string->pointer name)))) | |
884 | (if (null-pointer? ptr) | |
885 | (throw 'system-error "opendir*" | |
3bacc655 | 886 | "~A: ~A" (list name (strerror err)) |
fa73c193 LC |
887 | (list err)) |
888 | ptr))))) | |
889 | ||
890 | (define closedir* | |
891 | (let ((proc (syscall->procedure int "closedir" '(*)))) | |
892 | (lambda (directory) | |
893 | (let-values (((ret err) | |
894 | (proc directory))) | |
895 | (unless (zero? ret) | |
896 | (throw 'system-error "closedir" | |
897 | "closedir: ~A" (list (strerror err)) | |
898 | (list err))))))) | |
899 | ||
900 | (define readdir* | |
901 | (let ((proc (syscall->procedure '* "readdir64" '(*)))) | |
902 | (lambda* (directory #:optional (pointer->string pointer->string/utf-8)) | |
903 | (let ((ptr (proc directory))) | |
904 | (and (not (null-pointer? ptr)) | |
905 | (cons (pointer->string | |
906 | (make-pointer (+ (pointer-address ptr) | |
907 | (c-struct-field-offset | |
908 | %struct-dirent-header name))) | |
909 | -1) | |
910 | (read-dirent-header | |
911 | (pointer->bytevector ptr sizeof-dirent-header)))))))) | |
912 | ||
913 | (define* (scandir* name #:optional | |
914 | (select? (const #t)) | |
915 | (entry<? (lambda (entry1 entry2) | |
916 | (match entry1 | |
917 | ((name1 . _) | |
918 | (match entry2 | |
919 | ((name2 . _) | |
920 | (string<? name1 name2))))))) | |
921 | #:key | |
922 | (string->pointer string->pointer/utf-8) | |
923 | (pointer->string pointer->string/utf-8)) | |
924 | "This procedure improves on Guile's 'scandir' procedure in several ways: | |
925 | ||
926 | 1. Systematically encode decode file names using STRING->POINTER and | |
927 | POINTER->STRING (UTF-8 by default; this works around a defect in Guile 2.0/2.2 | |
928 | where 'scandir' decodes file names according to the current locale, which is | |
929 | not always desirable. | |
930 | ||
931 | 2. Each entry that is returned has the form (NAME . PROPERTIES). | |
932 | PROPERTIES is an alist showing additional properties about the entry, as | |
933 | found in 'struct dirent'. An entry may look like this: | |
934 | ||
935 | (\"foo.scm\" (type . regular) (inode . 123456)) | |
936 | ||
937 | Callers must be prepared to deal with the case where 'type' is 'unknown' | |
938 | since some file systems do not provide that information. | |
939 | ||
940 | 3. Raise to 'system-error' when NAME cannot be opened." | |
941 | (let ((directory (opendir* name string->pointer))) | |
942 | (dynamic-wind | |
943 | (const #t) | |
944 | (lambda () | |
945 | (let loop ((result '())) | |
946 | (match (readdir* directory pointer->string) | |
947 | (#f | |
948 | (sort result entry<?)) | |
949 | (entry | |
950 | (loop (if (select? entry) | |
951 | (cons entry result) | |
952 | result)))))) | |
953 | (lambda () | |
954 | (closedir* directory))))) | |
955 | ||
956 | \f | |
4e0ea3eb LC |
957 | ;;; |
958 | ;;; Advisory file locking. | |
959 | ;;; | |
960 | ||
d33c8b46 LC |
961 | (define-c-struct %struct-flock ;<fcntl.h> |
962 | sizeof-flock | |
963 | list | |
964 | read-flock | |
965 | write-flock! | |
966 | (type short) | |
967 | (whence short) | |
968 | (start size_t) | |
969 | (length size_t) | |
970 | (pid int)) | |
4e0ea3eb LC |
971 | |
972 | (define F_SETLKW | |
973 | ;; On Linux-based systems, this is usually 7, but not always | |
974 | ;; (exceptions include SPARC.) On GNU/Hurd, it's 9. | |
975 | (cond ((string-contains %host-type "sparc") 9) ; sparc-*-linux-gnu | |
976 | ((string-contains %host-type "linux") 7) ; *-linux-gnu | |
977 | (else 9))) ; *-gnu* | |
978 | ||
979 | (define F_SETLK | |
980 | ;; Likewise: GNU/Hurd and SPARC use 8, while the others typically use 6. | |
981 | (cond ((string-contains %host-type "sparc") 8) ; sparc-*-linux-gnu | |
982 | ((string-contains %host-type "linux") 6) ; *-linux-gnu | |
983 | (else 8))) ; *-gnu* | |
984 | ||
985 | (define F_xxLCK | |
986 | ;; The F_RDLCK, F_WRLCK, and F_UNLCK constants. | |
987 | (cond ((string-contains %host-type "sparc") #(1 2 3)) ; sparc-*-linux-gnu | |
988 | ((string-contains %host-type "hppa") #(1 2 3)) ; hppa-*-linux-gnu | |
989 | ((string-contains %host-type "linux") #(0 1 2)) ; *-linux-gnu | |
990 | (else #(1 2 3)))) ; *-gnu* | |
991 | ||
992 | (define fcntl-flock | |
993 | (let ((proc (syscall->procedure int "fcntl" `(,int ,int *)))) | |
994 | (lambda* (fd-or-port operation #:key (wait? #t)) | |
995 | "Perform locking OPERATION on the file beneath FD-OR-PORT. OPERATION | |
996 | must be a symbol, one of 'read-lock, 'write-lock, or 'unlock. When WAIT? is | |
997 | true, block until the lock is acquired; otherwise, thrown an 'flock-error' | |
998 | exception if it's already taken." | |
999 | (define (operation->int op) | |
1000 | (case op | |
1001 | ((read-lock) (vector-ref F_xxLCK 0)) | |
1002 | ((write-lock) (vector-ref F_xxLCK 1)) | |
1003 | ((unlock) (vector-ref F_xxLCK 2)) | |
1004 | (else (error "invalid fcntl-flock operation" op)))) | |
1005 | ||
1006 | (define fd | |
1007 | (if (port? fd-or-port) | |
1008 | (fileno fd-or-port) | |
1009 | fd-or-port)) | |
1010 | ||
d33c8b46 LC |
1011 | (define bv |
1012 | (make-bytevector sizeof-flock)) | |
1013 | ||
1014 | (write-flock! bv 0 | |
1015 | (operation->int operation) SEEK_SET | |
1016 | 0 0 ;whole file | |
1017 | 0) | |
1018 | ||
4e0ea3eb LC |
1019 | ;; XXX: 'fcntl' is a vararg function, but here we happily use the |
1020 | ;; standard ABI; crossing fingers. | |
26ffb693 LC |
1021 | (let-values (((ret err) |
1022 | (proc fd | |
1023 | (if wait? | |
1024 | F_SETLKW ;lock & wait | |
1025 | F_SETLK) ;non-blocking attempt | |
1026 | (bytevector->pointer bv)))) | |
d33c8b46 LC |
1027 | (unless (zero? ret) |
1028 | ;; Presumably we got EAGAIN or so. | |
1029 | (throw 'flock-error err)))))) | |
4e0ea3eb LC |
1030 | |
1031 | \f | |
aa401f9b LC |
1032 | ;;; |
1033 | ;;; Miscellaneous, aka. 'prctl'. | |
1034 | ;;; | |
1035 | ||
1036 | (define %prctl | |
1037 | ;; Should it win the API contest against 'ioctl'? You tell us! | |
1038 | (syscall->procedure int "prctl" | |
1039 | (list int unsigned-long unsigned-long | |
1040 | unsigned-long unsigned-long))) | |
1041 | ||
1042 | (define PR_SET_NAME 15) ;<linux/prctl.h> | |
1043 | (define PR_GET_NAME 16) | |
1044 | ||
1045 | (define %max-thread-name-length | |
1046 | ;; Maximum length in bytes of the process name, including the terminating | |
1047 | ;; zero. | |
1048 | 16) | |
1049 | ||
1050 | (define (set-thread-name name) | |
1051 | "Set the name of the calling thread to NAME. NAME is truncated to 15 | |
1052 | bytes." | |
1053 | (let ((ptr (string->pointer name))) | |
1054 | (let-values (((ret err) | |
1055 | (%prctl PR_SET_NAME | |
1056 | (pointer-address ptr) 0 0 0))) | |
1057 | (unless (zero? ret) | |
1058 | (throw 'set-process-name "set-process-name" | |
1059 | "set-process-name: ~A" | |
1060 | (list (strerror err)) | |
1061 | (list err)))))) | |
1062 | ||
1063 | (define (thread-name) | |
1064 | "Return the name of the calling thread as a string." | |
1065 | (let ((buf (make-bytevector %max-thread-name-length))) | |
1066 | (let-values (((ret err) | |
1067 | (%prctl PR_GET_NAME | |
1068 | (pointer-address (bytevector->pointer buf)) | |
1069 | 0 0 0))) | |
1070 | (if (zero? ret) | |
1071 | (bytes->string (bytevector->u8-list buf)) | |
1072 | (throw 'process-name "process-name" | |
1073 | "process-name: ~A" | |
1074 | (list (strerror err)) | |
1075 | (list err)))))) | |
1076 | ||
1077 | \f | |
7585016f LC |
1078 | ;;; |
1079 | ;;; Network interfaces. | |
1080 | ;;; | |
1081 | ||
1082 | (define SIOCGIFCONF ;from <bits/ioctls.h> | |
1083 | (if (string-contains %host-type "linux") | |
1084 | #x8912 ;GNU/Linux | |
1085 | #xf00801a4)) ;GNU/Hurd | |
973eea34 LC |
1086 | (define SIOCGIFFLAGS |
1087 | (if (string-contains %host-type "linux") | |
1088 | #x8913 ;GNU/Linux | |
1089 | #xc4804191)) ;GNU/Hurd | |
c9bf64d6 LC |
1090 | (define SIOCSIFFLAGS |
1091 | (if (string-contains %host-type "linux") | |
1092 | #x8914 ;GNU/Linux | |
1093 | -1)) ;FIXME: GNU/Hurd? | |
1094 | (define SIOCGIFADDR | |
1095 | (if (string-contains %host-type "linux") | |
1096 | #x8915 ;GNU/Linux | |
1097 | -1)) ;FIXME: GNU/Hurd? | |
1098 | (define SIOCSIFADDR | |
1099 | (if (string-contains %host-type "linux") | |
1100 | #x8916 ;GNU/Linux | |
1101 | -1)) ;FIXME: GNU/Hurd? | |
67e5f3b7 LC |
1102 | (define SIOCGIFNETMASK |
1103 | (if (string-contains %host-type "linux") | |
1104 | #x891b ;GNU/Linux | |
1105 | -1)) ;FIXME: GNU/Hurd? | |
1106 | (define SIOCSIFNETMASK | |
1107 | (if (string-contains %host-type "linux") | |
1108 | #x891c ;GNU/Linux | |
1109 | -1)) ;FIXME: GNU/Hurd? | |
9e38e3cf LC |
1110 | (define SIOCADDRT |
1111 | (if (string-contains %host-type "linux") | |
1112 | #x890B ;GNU/Linux | |
1113 | -1)) ;FIXME: GNU/Hurd? | |
1114 | (define SIOCDELRT | |
1115 | (if (string-contains %host-type "linux") | |
1116 | #x890C ;GNU/Linux | |
1117 | -1)) ;FIXME: GNU/Hurd? | |
973eea34 LC |
1118 | |
1119 | ;; Flags and constants from <net/if.h>. | |
1120 | ||
c5cd4fad MO |
1121 | (define-as-needed IFF_UP #x1) ;Interface is up |
1122 | (define-as-needed IFF_BROADCAST #x2) ;Broadcast address valid. | |
1123 | (define-as-needed IFF_LOOPBACK #x8) ;Is a loopback net. | |
0bc6fe32 | 1124 | (define-as-needed IFF_RUNNING #x40) ;interface RFC2863 OPER_UP |
973eea34 LC |
1125 | |
1126 | (define IF_NAMESIZE 16) ;maximum interface name size | |
7585016f | 1127 | |
9d9d0c9c LC |
1128 | (define-c-struct %ifconf-struct |
1129 | sizeof-ifconf | |
1130 | list | |
1131 | read-ifconf | |
1132 | write-ifconf! | |
1133 | (length int) ;int ifc_len | |
1134 | (request '*)) ;struct ifreq *ifc_ifcu | |
7585016f LC |
1135 | |
1136 | (define ifreq-struct-size | |
973eea34 LC |
1137 | ;; 'struct ifreq' begins with an array of IF_NAMESIZE bytes containing the |
1138 | ;; interface name (nul-terminated), followed by a bunch of stuff. This is | |
1139 | ;; its size in bytes. | |
7585016f LC |
1140 | (if (= 8 (sizeof '*)) |
1141 | 40 | |
1142 | 32)) | |
1143 | ||
c9bf64d6 | 1144 | (define-c-struct sockaddr-in ;<linux/in.h> |
785cfa87 | 1145 | sizeof-sockaddrin |
13f0c6ed LC |
1146 | (lambda (family port address) |
1147 | (make-socket-address family address port)) | |
c9bf64d6 LC |
1148 | read-sockaddr-in |
1149 | write-sockaddr-in! | |
1150 | (family unsigned-short) | |
1151 | (port (int16 ~ big)) | |
1152 | (address (int32 ~ big))) | |
1153 | ||
1154 | (define-c-struct sockaddr-in6 ;<linux/in6.h> | |
785cfa87 | 1155 | sizeof-sockaddr-in6 |
13f0c6ed LC |
1156 | (lambda (family port flowinfo address scopeid) |
1157 | (make-socket-address family address port flowinfo scopeid)) | |
c9bf64d6 LC |
1158 | read-sockaddr-in6 |
1159 | write-sockaddr-in6! | |
1160 | (family unsigned-short) | |
1161 | (port (int16 ~ big)) | |
1162 | (flowinfo (int32 ~ big)) | |
1163 | (address (int128 ~ big)) | |
1164 | (scopeid int32)) | |
1165 | ||
1166 | (define (write-socket-address! sockaddr bv index) | |
1167 | "Write SOCKADDR, a socket address as returned by 'make-socket-address', to | |
1168 | bytevector BV at INDEX." | |
1169 | (let ((family (sockaddr:fam sockaddr))) | |
1170 | (cond ((= family AF_INET) | |
1171 | (write-sockaddr-in! bv index | |
1172 | family | |
1173 | (sockaddr:port sockaddr) | |
1174 | (sockaddr:addr sockaddr))) | |
1175 | ((= family AF_INET6) | |
1176 | (write-sockaddr-in6! bv index | |
1177 | family | |
1178 | (sockaddr:port sockaddr) | |
1179 | (sockaddr:flowinfo sockaddr) | |
1180 | (sockaddr:addr sockaddr) | |
1181 | (sockaddr:scopeid sockaddr))) | |
1182 | (else | |
1183 | (error "unsupported socket address" sockaddr))))) | |
1184 | ||
3ca33769 LC |
1185 | (define PF_PACKET 17) ;<bits/socket.h> |
1186 | (define AF_PACKET PF_PACKET) | |
1187 | ||
1188 | (define* (read-socket-address bv #:optional (index 0)) | |
c9bf64d6 LC |
1189 | "Read a socket address from bytevector BV at INDEX." |
1190 | (let ((family (bytevector-u16-native-ref bv index))) | |
1191 | (cond ((= family AF_INET) | |
13f0c6ed | 1192 | (read-sockaddr-in bv index)) |
c9bf64d6 | 1193 | ((= family AF_INET6) |
13f0c6ed | 1194 | (read-sockaddr-in6 bv index)) |
c9bf64d6 | 1195 | (else |
3ca33769 LC |
1196 | ;; XXX: Unsupported address family, such as AF_PACKET. Return a |
1197 | ;; vector such that the vector can at least call 'sockaddr:fam'. | |
1198 | (vector family))))) | |
c9bf64d6 | 1199 | |
7585016f LC |
1200 | (define %ioctl |
1201 | ;; The most terrible interface, live from Scheme. | |
d1f33ba4 | 1202 | (syscall->procedure int "ioctl" (list int unsigned-long '*))) |
7585016f | 1203 | |
57f068be LC |
1204 | (define (bytes->string bytes) |
1205 | "Read BYTES, a list of bytes, and return the null-terminated string decoded | |
1206 | from there, or #f if that would be an empty string." | |
1207 | (match (take-while (negate zero?) bytes) | |
1208 | (() | |
1209 | #f) | |
1210 | (non-zero | |
1211 | (list->string (map integer->char non-zero))))) | |
1212 | ||
7585016f LC |
1213 | (define (bytevector->string-list bv stride len) |
1214 | "Return the null-terminated strings found in BV every STRIDE bytes. Read at | |
1215 | most LEN bytes from BV." | |
1216 | (let loop ((bytes (take (bytevector->u8-list bv) | |
1217 | (min len (bytevector-length bv)))) | |
1218 | (result '())) | |
1219 | (match bytes | |
1220 | (() | |
1221 | (reverse result)) | |
1222 | (_ | |
1223 | (loop (drop bytes stride) | |
57f068be | 1224 | (cons (bytes->string bytes) result)))))) |
7585016f | 1225 | |
b89e7405 LC |
1226 | (define* (network-interface-names #:optional sock) |
1227 | "Return the names of existing network interfaces. This is typically limited | |
4d54785c | 1228 | to interfaces that are currently up." |
7585016f LC |
1229 | (let* ((close? (not sock)) |
1230 | (sock (or sock (socket SOCK_STREAM AF_INET 0))) | |
1231 | (len (* ifreq-struct-size 10)) | |
1232 | (reqs (make-bytevector len)) | |
9d9d0c9c LC |
1233 | (conf (make-bytevector sizeof-ifconf))) |
1234 | (write-ifconf! conf 0 | |
1235 | len (bytevector->pointer reqs)) | |
1236 | ||
26ffb693 | 1237 | (let-values (((ret err) |
9d9d0c9c LC |
1238 | (%ioctl (fileno sock) SIOCGIFCONF |
1239 | (bytevector->pointer conf)))) | |
26ffb693 LC |
1240 | (when close? |
1241 | (close-port sock)) | |
1242 | (if (zero? ret) | |
1243 | (bytevector->string-list reqs ifreq-struct-size | |
9d9d0c9c | 1244 | (match (read-ifconf conf) |
26ffb693 LC |
1245 | ((len . _) len))) |
1246 | (throw 'system-error "network-interface-list" | |
1247 | "network-interface-list: ~A" | |
1248 | (list (strerror err)) | |
1249 | (list err)))))) | |
7585016f | 1250 | |
4d54785c LC |
1251 | (define %interface-line |
1252 | ;; Regexp matching an interface line in Linux's /proc/net/dev. | |
a220b262 | 1253 | (make-regexp "^[[:blank:]]*([[:graph:]]+):.*$")) |
4d54785c | 1254 | |
b89e7405 LC |
1255 | (define (all-network-interface-names) |
1256 | "Return all the names of the registered network interfaces, including those | |
1257 | that are not up." | |
4d54785c LC |
1258 | (call-with-input-file "/proc/net/dev" ;XXX: Linux-specific |
1259 | (lambda (port) | |
1260 | (let loop ((interfaces '())) | |
1261 | (let ((line (read-line port))) | |
1262 | (cond ((eof-object? line) | |
1263 | (reverse interfaces)) | |
1264 | ((regexp-exec %interface-line line) | |
1265 | => | |
1266 | (lambda (match) | |
1267 | (loop (cons (match:substring match 1) interfaces)))) | |
1268 | (else | |
1269 | (loop interfaces)))))))) | |
1270 | ||
c5cd4fad | 1271 | (define-as-needed (network-interface-flags socket name) |
973eea34 LC |
1272 | "Return a number that is the bit-wise or of 'IFF*' flags for network |
1273 | interface NAME." | |
1274 | (let ((req (make-bytevector ifreq-struct-size))) | |
1275 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1276 | (min (string-length name) (- IF_NAMESIZE 1))) | |
26ffb693 LC |
1277 | (let-values (((ret err) |
1278 | (%ioctl (fileno socket) SIOCGIFFLAGS | |
1279 | (bytevector->pointer req)))) | |
973eea34 LC |
1280 | (if (zero? ret) |
1281 | ||
c5cd4fad MO |
1282 | ;; The 'ifr_flags' field is IF_NAMESIZE bytes after the |
1283 | ;; beginning of 'struct ifreq', and it's a short int. | |
973eea34 LC |
1284 | (bytevector-sint-ref req IF_NAMESIZE (native-endianness) |
1285 | (sizeof short)) | |
1286 | ||
1287 | (throw 'system-error "network-interface-flags" | |
1288 | "network-interface-flags on ~A: ~A" | |
1289 | (list name (strerror err)) | |
1290 | (list err)))))) | |
1291 | ||
1292 | (define (loopback-network-interface? name) | |
1293 | "Return true if NAME designates a loopback network interface." | |
1294 | (let* ((sock (socket SOCK_STREAM AF_INET 0)) | |
1295 | (flags (network-interface-flags sock name))) | |
1296 | (close-port sock) | |
1297 | (not (zero? (logand flags IFF_LOOPBACK))))) | |
1298 | ||
0bc6fe32 DM |
1299 | (define (network-interface-running? name) |
1300 | "Return true if NAME designates a running network interface." | |
1301 | (let* ((sock (socket SOCK_STREAM AF_INET 0)) | |
1302 | (flags (network-interface-flags sock name))) | |
1303 | (close-port sock) | |
1304 | (not (zero? (logand flags IFF_RUNNING))))) | |
1305 | ||
c5cd4fad | 1306 | (define-as-needed (set-network-interface-flags socket name flags) |
c9bf64d6 LC |
1307 | "Set the flag of network interface NAME to FLAGS." |
1308 | (let ((req (make-bytevector ifreq-struct-size))) | |
1309 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1310 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1311 | ;; Set the 'ifr_flags' field. | |
1312 | (bytevector-uint-set! req IF_NAMESIZE flags (native-endianness) | |
1313 | (sizeof short)) | |
26ffb693 LC |
1314 | (let-values (((ret err) |
1315 | (%ioctl (fileno socket) SIOCSIFFLAGS | |
1316 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1317 | (unless (zero? ret) |
1318 | (throw 'system-error "set-network-interface-flags" | |
1319 | "set-network-interface-flags on ~A: ~A" | |
1320 | (list name (strerror err)) | |
1321 | (list err)))))) | |
1322 | ||
c5cd4fad | 1323 | (define-as-needed (set-network-interface-address socket name sockaddr) |
c9bf64d6 LC |
1324 | "Set the address of network interface NAME to SOCKADDR." |
1325 | (let ((req (make-bytevector ifreq-struct-size))) | |
1326 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1327 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1328 | ;; Set the 'ifr_addr' field. | |
1329 | (write-socket-address! sockaddr req IF_NAMESIZE) | |
26ffb693 LC |
1330 | (let-values (((ret err) |
1331 | (%ioctl (fileno socket) SIOCSIFADDR | |
1332 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1333 | (unless (zero? ret) |
1334 | (throw 'system-error "set-network-interface-address" | |
1335 | "set-network-interface-address on ~A: ~A" | |
1336 | (list name (strerror err)) | |
1337 | (list err)))))) | |
1338 | ||
67e5f3b7 LC |
1339 | (define (set-network-interface-netmask socket name sockaddr) |
1340 | "Set the network mask of interface NAME to SOCKADDR." | |
1341 | (let ((req (make-bytevector ifreq-struct-size))) | |
1342 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1343 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1344 | ;; Set the 'ifr_addr' field. | |
1345 | (write-socket-address! sockaddr req IF_NAMESIZE) | |
1346 | (let-values (((ret err) | |
1347 | (%ioctl (fileno socket) SIOCSIFNETMASK | |
1348 | (bytevector->pointer req)))) | |
1349 | (unless (zero? ret) | |
1350 | (throw 'system-error "set-network-interface-netmask" | |
1351 | "set-network-interface-netmask on ~A: ~A" | |
1352 | (list name (strerror err)) | |
1353 | (list err)))))) | |
1354 | ||
c9bf64d6 LC |
1355 | (define (network-interface-address socket name) |
1356 | "Return the address of network interface NAME. The result is an object of | |
1357 | the same type as that returned by 'make-socket-address'." | |
1358 | (let ((req (make-bytevector ifreq-struct-size))) | |
1359 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1360 | (min (string-length name) (- IF_NAMESIZE 1))) | |
26ffb693 LC |
1361 | (let-values (((ret err) |
1362 | (%ioctl (fileno socket) SIOCGIFADDR | |
1363 | (bytevector->pointer req)))) | |
c9bf64d6 LC |
1364 | (if (zero? ret) |
1365 | (read-socket-address req IF_NAMESIZE) | |
1366 | (throw 'system-error "network-interface-address" | |
1367 | "network-interface-address on ~A: ~A" | |
1368 | (list name (strerror err)) | |
1369 | (list err)))))) | |
1370 | ||
67e5f3b7 LC |
1371 | (define (network-interface-netmask socket name) |
1372 | "Return the netmask of network interface NAME. The result is an object of | |
1373 | the same type as that returned by 'make-socket-address'." | |
1374 | (let ((req (make-bytevector ifreq-struct-size))) | |
1375 | (bytevector-copy! (string->utf8 name) 0 req 0 | |
1376 | (min (string-length name) (- IF_NAMESIZE 1))) | |
1377 | (let-values (((ret err) | |
1378 | (%ioctl (fileno socket) SIOCGIFNETMASK | |
1379 | (bytevector->pointer req)))) | |
1380 | (if (zero? ret) | |
1381 | (read-socket-address req IF_NAMESIZE) | |
1382 | (throw 'system-error "network-interface-netmask" | |
1383 | "network-interface-netmask on ~A: ~A" | |
1384 | (list name (strerror err)) | |
1385 | (list err)))))) | |
1386 | ||
e9ff8d9f LC |
1387 | (define* (configure-network-interface name sockaddr flags |
1388 | #:key netmask) | |
c9bf64d6 | 1389 | "Configure network interface NAME to use SOCKADDR, an address as returned by |
e9ff8d9f LC |
1390 | 'make-socket-address', and FLAGS, a bitwise-or of IFF_* constants. If NETMASK |
1391 | is true, it must be a socket address to use as the network mask." | |
c9bf64d6 LC |
1392 | (let ((sock (socket (sockaddr:fam sockaddr) SOCK_STREAM 0))) |
1393 | (dynamic-wind | |
1394 | (const #t) | |
1395 | (lambda () | |
1396 | (set-network-interface-address sock name sockaddr) | |
e9ff8d9f LC |
1397 | (set-network-interface-flags sock name flags) |
1398 | (when netmask | |
1399 | (set-network-interface-netmask sock name netmask))) | |
c9bf64d6 LC |
1400 | (lambda () |
1401 | (close-port sock))))) | |
1402 | ||
6944fdbd LC |
1403 | (define* (set-network-interface-up name |
1404 | #:key (family AF_INET)) | |
1405 | "Turn up the interface NAME." | |
1406 | (let ((sock (socket family SOCK_STREAM 0))) | |
1407 | (dynamic-wind | |
1408 | (const #t) | |
1409 | (lambda () | |
1410 | (let ((flags (network-interface-flags sock name))) | |
1411 | (set-network-interface-flags sock name | |
1412 | (logior flags IFF_UP)))) | |
1413 | (lambda () | |
1414 | (close-port sock))))) | |
1415 | ||
e7f5691d | 1416 | \f |
9e38e3cf LC |
1417 | ;;; |
1418 | ;;; Network routes. | |
1419 | ;;; | |
1420 | ||
1421 | (define-c-struct %rtentry ;'struct rtentry' from <net/route.h> | |
1422 | sizeof-rtentry | |
1423 | list | |
1424 | read-rtentry | |
1425 | write-rtentry! | |
1426 | (pad1 unsigned-long) | |
1427 | (destination (array uint8 16)) ;struct sockaddr | |
1428 | (gateway (array uint8 16)) ;struct sockaddr | |
1429 | (genmask (array uint8 16)) ;struct sockaddr | |
1430 | (flags unsigned-short) | |
1431 | (pad2 short) | |
1432 | (pad3 long) | |
1433 | (tos uint8) | |
1434 | (class uint8) | |
1435 | (pad4 (array uint8 (if (= 8 (sizeof* '*)) 3 1))) | |
1436 | (metric short) | |
1437 | (device '*) | |
1438 | (mtu unsigned-long) | |
1439 | (window unsigned-long) | |
1440 | (initial-rtt unsigned-short)) | |
1441 | ||
1442 | (define RTF_UP #x0001) ;'rtentry' flags from <net/route.h> | |
1443 | (define RTF_GATEWAY #x0002) | |
1444 | ||
1445 | (define %sockaddr-any | |
1446 | (make-socket-address AF_INET INADDR_ANY 0)) | |
1447 | ||
1448 | (define add-network-route/gateway | |
1449 | ;; To allow field names to be matched as literals, we need to move them out | |
1450 | ;; of the lambda's body since the parameters have the same name. A lot of | |
1451 | ;; fuss for very little. | |
1452 | (let-syntax ((gateway-offset (identifier-syntax | |
1453 | (c-struct-field-offset %rtentry gateway))) | |
1454 | (destination-offset (identifier-syntax | |
1455 | (c-struct-field-offset %rtentry destination))) | |
1456 | (genmask-offset (identifier-syntax | |
1457 | (c-struct-field-offset %rtentry genmask)))) | |
1458 | (lambda* (socket gateway | |
1459 | #:key (destination %sockaddr-any) (genmask %sockaddr-any)) | |
1460 | "Add a network route for DESTINATION (a socket address as returned by | |
1461 | 'make-socket-address') that goes through GATEWAY (a socket address). For | |
1462 | instance, the call: | |
1463 | ||
1464 | (add-network-route/gateway sock | |
1465 | (make-socket-address | |
1466 | AF_INET | |
1467 | (inet-pton AF_INET \"192.168.0.1\") | |
1468 | 0)) | |
1469 | ||
1470 | is equivalent to this 'net-tools' command: | |
1471 | ||
1472 | route add -net default gw 192.168.0.1 | |
1473 | ||
1474 | because the default value of DESTINATION is \"0.0.0.0\"." | |
1475 | (let ((route (make-bytevector sizeof-rtentry 0))) | |
1476 | (write-socket-address! gateway route gateway-offset) | |
1477 | (write-socket-address! destination route destination-offset) | |
1478 | (write-socket-address! genmask route genmask-offset) | |
1479 | (bytevector-u16-native-set! route | |
1480 | (c-struct-field-offset %rtentry flags) | |
1481 | (logior RTF_UP RTF_GATEWAY)) | |
1482 | (let-values (((ret err) | |
1483 | (%ioctl (fileno socket) SIOCADDRT | |
1484 | (bytevector->pointer route)))) | |
1485 | (unless (zero? ret) | |
1486 | (throw 'system-error "add-network-route/gateway" | |
1487 | "add-network-route/gateway: ~A" | |
1488 | (list (strerror err)) | |
1489 | (list err)))))))) | |
1490 | ||
1491 | (define delete-network-route | |
1492 | (let-syntax ((destination-offset (identifier-syntax | |
1493 | (c-struct-field-offset %rtentry destination)))) | |
1494 | (lambda* (socket destination) | |
1495 | "Delete the network route for DESTINATION. For instance, the call: | |
1496 | ||
1497 | (delete-network-route sock | |
1498 | (make-socket-address AF_INET INADDR_ANY 0)) | |
1499 | ||
1500 | is equivalent to the 'net-tools' command: | |
1501 | ||
1502 | route del -net default | |
1503 | " | |
1504 | ||
1505 | (let ((route (make-bytevector sizeof-rtentry 0))) | |
1506 | (write-socket-address! destination route destination-offset) | |
1507 | (let-values (((ret err) | |
1508 | (%ioctl (fileno socket) SIOCDELRT | |
1509 | (bytevector->pointer route)))) | |
1510 | (unless (zero? ret) | |
1511 | (throw 'system-error "delete-network-route" | |
1512 | "delete-network-route: ~A" | |
1513 | (list (strerror err)) | |
1514 | (list err)))))))) | |
1515 | ||
1516 | \f | |
e7f5691d LC |
1517 | ;;; |
1518 | ;;; Details about network interfaces---aka. 'getifaddrs'. | |
1519 | ;;; | |
1520 | ||
1521 | ;; Network interfaces. XXX: We would call it <network-interface> but that | |
1522 | ;; would collide with the ioctl wrappers above. | |
1523 | (define-record-type <interface> | |
1524 | (make-interface name flags address netmask broadcast-address) | |
1525 | interface? | |
1526 | (name interface-name) ;string | |
1527 | (flags interface-flags) ;or'd IFF_* values | |
1528 | (address interface-address) ;sockaddr | #f | |
1529 | (netmask interface-netmask) ;sockaddr | #f | |
1530 | (broadcast-address interface-broadcast-address)) ;sockaddr | #f | |
1531 | ||
1532 | (define (write-interface interface port) | |
1533 | (match interface | |
1534 | (($ <interface> name flags address) | |
1535 | (format port "#<interface ~s " name) | |
1536 | (unless (zero? (logand IFF_UP flags)) | |
1537 | (display "up " port)) | |
001dae0d LC |
1538 | |
1539 | ;; Check whether ADDRESS really is a sockaddr. | |
1540 | (when address | |
1541 | (if (member (sockaddr:fam address) (list AF_INET AF_INET6)) | |
1542 | (format port "~a " (inet-ntop (sockaddr:fam address) | |
1543 | (sockaddr:addr address))) | |
1544 | (format port "family:~a " (sockaddr:fam address)))) | |
1545 | ||
e7f5691d LC |
1546 | (format port "~a>" (number->string (object-address interface) 16))))) |
1547 | ||
1548 | (set-record-type-printer! <interface> write-interface) | |
1549 | ||
1550 | (define (values->interface next name flags address netmask | |
1551 | broadcast-address data) | |
1552 | "Given the raw field values passed as arguments, return a pair whose car is | |
1553 | an <interface> object, and whose cdr is the pointer NEXT." | |
1554 | (define (maybe-socket-address pointer) | |
1555 | (if (null-pointer? pointer) | |
1556 | #f | |
1557 | (read-socket-address (pointer->bytevector pointer 50)))) ;XXX: size | |
1558 | ||
1559 | (cons (make-interface (if (null-pointer? name) | |
1560 | #f | |
1561 | (pointer->string name)) | |
1562 | flags | |
1563 | (maybe-socket-address address) | |
1564 | (maybe-socket-address netmask) | |
1565 | (maybe-socket-address broadcast-address) | |
1566 | ;; Ignore DATA. | |
1567 | ) | |
1568 | next)) | |
1569 | ||
1570 | (define-c-struct ifaddrs ;<ifaddrs.h> | |
785cfa87 | 1571 | %sizeof-ifaddrs |
e7f5691d LC |
1572 | values->interface |
1573 | read-ifaddrs | |
1574 | write-ifaddrs! | |
1575 | (next '*) | |
1576 | (name '*) | |
1577 | (flags unsigned-int) | |
1578 | (addr '*) | |
1579 | (netmask '*) | |
1580 | (broadcastaddr '*) | |
1581 | (data '*)) | |
1582 | ||
e7f5691d LC |
1583 | (define (unfold-interface-list ptr) |
1584 | "Call 'read-ifaddrs' on PTR and all its 'next' fields, recursively, and | |
1585 | return the list of resulting <interface> objects." | |
1586 | (let loop ((ptr ptr) | |
1587 | (result '())) | |
1588 | (if (null-pointer? ptr) | |
1589 | (reverse result) | |
f77863a0 | 1590 | (match (read-ifaddrs (pointer->bytevector ptr %sizeof-ifaddrs)) |
e7f5691d LC |
1591 | ((ifaddr . ptr) |
1592 | (loop ptr (cons ifaddr result))))))) | |
1593 | ||
1594 | (define network-interfaces | |
d1f33ba4 | 1595 | (let ((proc (syscall->procedure int "getifaddrs" (list '*)))) |
e7f5691d LC |
1596 | (lambda () |
1597 | "Return a list of <interface> objects, each denoting a configured | |
1598 | network interface. This is implemented using the 'getifaddrs' libc function." | |
26ffb693 LC |
1599 | (let*-values (((ptr) |
1600 | (bytevector->pointer (make-bytevector (sizeof* '*)))) | |
1601 | ((ret err) | |
1602 | (proc ptr))) | |
e7f5691d LC |
1603 | (if (zero? ret) |
1604 | (let* ((ptr (dereference-pointer ptr)) | |
1605 | (result (unfold-interface-list ptr))) | |
1606 | (free-ifaddrs ptr) | |
1607 | result) | |
1608 | (throw 'system-error "network-interfaces" "~A" | |
1609 | (list (strerror err)) | |
1610 | (list err))))))) | |
1611 | ||
1612 | (define free-ifaddrs | |
d1f33ba4 | 1613 | (syscall->procedure void "freeifaddrs" '(*))) |
e7f5691d | 1614 | |
29ff6d9f LC |
1615 | \f |
1616 | ;;; | |
1617 | ;;; Terminals. | |
1618 | ;;; | |
1619 | ||
ae4ff9f3 LC |
1620 | (define-syntax bits->symbols-body |
1621 | (syntax-rules () | |
1622 | ((_ bits () ()) | |
1623 | '()) | |
1624 | ((_ bits (name names ...) (value values ...)) | |
1625 | (let ((result (bits->symbols-body bits (names ...) (values ...)))) | |
1626 | (if (zero? (logand bits value)) | |
1627 | result | |
1628 | (cons 'name result)))))) | |
1629 | ||
1630 | (define-syntax define-bits | |
1631 | (syntax-rules (define) | |
1632 | "Define the given numerical constants under CONSTRUCTOR, such that | |
1633 | (CONSTRUCTOR NAME) returns VALUE. Define BITS->SYMBOLS as a procedure that, | |
1634 | given an integer, returns the list of names of the constants that are or'd." | |
1635 | ((_ constructor bits->symbols (define names values) ...) | |
1636 | (begin | |
1637 | (define-syntax constructor | |
1638 | (syntax-rules (names ...) | |
334c9530 | 1639 | ((_) 0) |
ae4ff9f3 | 1640 | ((_ names) values) ... |
334c9530 LC |
1641 | ((_ first rest (... ...)) |
1642 | (logior (constructor first) rest (... ...))))) | |
ae4ff9f3 | 1643 | (define (bits->symbols bits) |
334c9530 | 1644 | (bits->symbols-body bits (names ...) (values ...))))))) |
ae4ff9f3 LC |
1645 | |
1646 | ;; 'local-flags' bits from <bits/termios.h> | |
1647 | (define-bits local-flags | |
1648 | local-flags->symbols | |
1649 | (define ISIG #o0000001) | |
1650 | (define ICANON #o0000002) | |
1651 | (define XCASE #o0000004) | |
1652 | (define ECHO #o0000010) | |
1653 | (define ECHOE #o0000020) | |
1654 | (define ECHOK #o0000040) | |
1655 | (define ECHONL #o0000100) | |
1656 | (define NOFLSH #o0000200) | |
1657 | (define TOSTOP #o0000400) | |
1658 | (define ECHOCTL #o0001000) | |
1659 | (define ECHOPRT #o0002000) | |
1660 | (define ECHOKE #o0004000) | |
1661 | (define FLUSHO #o0010000) | |
1662 | (define PENDIN #o0040000) | |
1663 | (define IEXTEN #o0100000) | |
1664 | (define EXTPROC #o0200000)) | |
1665 | ||
45c32bd7 LC |
1666 | (define-bits input-flags |
1667 | input-flags->symbols | |
1668 | (define IGNBRK #o0000001) | |
1669 | (define BRKINT #o0000002) | |
1670 | (define IGNPAR #o0000004) | |
1671 | (define PARMRK #o0000010) | |
1672 | (define INPCK #o0000020) | |
1673 | (define ISTRIP #o0000040) | |
1674 | (define INLCR #o0000100) | |
1675 | (define IGNCR #o0000200) | |
1676 | (define ICRNL #o0000400) | |
1677 | (define IUCLC #o0001000) | |
1678 | (define IXON #o0002000) | |
1679 | (define IXANY #o0004000) | |
1680 | (define IXOFF #o0010000) | |
1681 | (define IMAXBEL #o0020000) | |
1682 | (define IUTF8 #o0040000)) | |
1683 | ||
ae4ff9f3 | 1684 | ;; "Actions" values for 'tcsetattr'. |
a8f3424b LC |
1685 | (define-bits tcsetattr-action |
1686 | %unused-tcsetattr-action->symbols | |
1687 | (define TCSANOW 0) | |
1688 | (define TCSADRAIN 1) | |
1689 | (define TCSAFLUSH 2)) | |
ae4ff9f3 LC |
1690 | |
1691 | (define-record-type <termios> | |
1692 | (termios input-flags output-flags control-flags local-flags | |
1693 | line-discipline control-chars | |
1694 | input-speed output-speed) | |
1695 | termios? | |
1696 | (input-flags termios-input-flags) | |
1697 | (output-flags termios-output-flags) | |
1698 | (control-flags termios-control-flags) | |
1699 | (local-flags termios-local-flags) | |
1700 | (line-discipline termios-line-discipline) | |
1701 | (control-chars termios-control-chars) | |
1702 | (input-speed termios-input-speed) | |
1703 | (output-speed termios-output-speed)) | |
1704 | ||
1705 | (define-c-struct %termios ;<bits/termios.h> | |
1706 | sizeof-termios | |
1707 | termios | |
1708 | read-termios | |
1709 | write-termios! | |
1710 | (input-flags unsigned-int) | |
1711 | (output-flags unsigned-int) | |
1712 | (control-flags unsigned-int) | |
1713 | (local-flags unsigned-int) | |
1714 | (line-discipline uint8) | |
1715 | (control-chars (array uint8 32)) | |
1716 | (input-speed unsigned-int) | |
1717 | (output-speed unsigned-int)) | |
1718 | ||
1719 | (define tcgetattr | |
1720 | (let ((proc (syscall->procedure int "tcgetattr" (list int '*)))) | |
1721 | (lambda (fd) | |
1722 | "Return the <termios> structure for the tty at FD." | |
26ffb693 LC |
1723 | (let*-values (((bv) (make-bytevector sizeof-termios)) |
1724 | ((ret err) (proc fd (bytevector->pointer bv)))) | |
ae4ff9f3 LC |
1725 | (if (zero? ret) |
1726 | (read-termios bv) | |
1727 | (throw 'system-error "tcgetattr" "~A" | |
1728 | (list (strerror err)) | |
1729 | (list err))))))) | |
1730 | ||
1731 | (define tcsetattr | |
1732 | (let ((proc (syscall->procedure int "tcsetattr" (list int int '*)))) | |
1733 | (lambda (fd actions termios) | |
a8f3424b LC |
1734 | "Use TERMIOS for the tty at FD. ACTIONS is one of of the values |
1735 | produced by 'tcsetattr-action'; see tcsetattr(3) for details." | |
ae4ff9f3 LC |
1736 | (define bv |
1737 | (make-bytevector sizeof-termios)) | |
1738 | ||
1739 | (let-syntax ((match/write (syntax-rules () | |
1740 | ((_ fields ...) | |
1741 | (match termios | |
1742 | (($ <termios> fields ...) | |
1743 | (write-termios! bv 0 fields ...))))))) | |
1744 | (match/write input-flags output-flags control-flags local-flags | |
1745 | line-discipline control-chars input-speed output-speed)) | |
1746 | ||
26ffb693 | 1747 | (let-values (((ret err) (proc fd actions (bytevector->pointer bv)))) |
ae4ff9f3 LC |
1748 | (unless (zero? ret) |
1749 | (throw 'system-error "tcgetattr" "~A" | |
1750 | (list (strerror err)) | |
1751 | (list err))))))) | |
1752 | ||
29ff6d9f LC |
1753 | (define-syntax TIOCGWINSZ ;<asm-generic/ioctls.h> |
1754 | (identifier-syntax #x5413)) | |
1755 | ||
1756 | (define-record-type <window-size> | |
1757 | (window-size rows columns x-pixels y-pixels) | |
1758 | window-size? | |
1759 | (rows window-size-rows) | |
1760 | (columns window-size-columns) | |
1761 | (x-pixels window-size-x-pixels) | |
1762 | (y-pixels window-size-y-pixels)) | |
1763 | ||
1764 | (define-c-struct winsize ;<bits/ioctl-types.h> | |
785cfa87 | 1765 | sizeof-winsize |
29ff6d9f LC |
1766 | window-size |
1767 | read-winsize | |
1768 | write-winsize! | |
1769 | (rows unsigned-short) | |
1770 | (columns unsigned-short) | |
1771 | (x-pixels unsigned-short) | |
1772 | (y-pixels unsigned-short)) | |
1773 | ||
29ff6d9f LC |
1774 | (define* (terminal-window-size #:optional (port (current-output-port))) |
1775 | "Return a <window-size> structure describing the terminal at PORT, or raise | |
1776 | a 'system-error' if PORT is not backed by a terminal. This procedure | |
1777 | corresponds to the TIOCGWINSZ ioctl." | |
26ffb693 LC |
1778 | (let*-values (((size) (make-bytevector sizeof-winsize)) |
1779 | ((ret err) (%ioctl (fileno port) TIOCGWINSZ | |
1780 | (bytevector->pointer size)))) | |
29ff6d9f | 1781 | (if (zero? ret) |
785cfa87 | 1782 | (read-winsize size) |
29ff6d9f LC |
1783 | (throw 'system-error "terminal-window-size" "~A" |
1784 | (list (strerror err)) | |
1785 | (list err))))) | |
1786 | ||
1787 | (define* (terminal-columns #:optional (port (current-output-port))) | |
1788 | "Return the best approximation of the number of columns of the terminal at | |
1789 | PORT, trying to guess a reasonable value if all else fails. The result is | |
1790 | always a positive integer." | |
1791 | (define (fall-back) | |
1792 | (match (and=> (getenv "COLUMNS") string->number) | |
1793 | (#f 80) | |
1794 | ((? number? columns) | |
1795 | (if (> columns 0) columns 80)))) | |
1796 | ||
1797 | (catch 'system-error | |
1798 | (lambda () | |
6d2b4391 LC |
1799 | (if (file-port? port) |
1800 | (match (window-size-columns (terminal-window-size port)) | |
1801 | ;; Things like Emacs shell-mode return 0, which is unreasonable. | |
1802 | (0 (fall-back)) | |
1803 | ((? number? columns) columns)) | |
1804 | (fall-back))) | |
29ff6d9f LC |
1805 | (lambda args |
1806 | (let ((errno (system-error-errno args))) | |
5cd25aad LC |
1807 | ;; ENOTTY is what we're after but 2012-and-earlier Linux versions |
1808 | ;; would return EINVAL instead in some cases: | |
1809 | ;; <https://bugs.ruby-lang.org/issues/10494>. | |
a6e0ae40 LC |
1810 | ;; Furthermore, some FUSE file systems like unionfs return ENOSYS for |
1811 | ;; that ioctl. | |
1812 | (if (memv errno (list ENOTTY EINVAL ENOSYS)) | |
29ff6d9f LC |
1813 | (fall-back) |
1814 | (apply throw args)))))) | |
1815 | ||
15030972 LC |
1816 | \f |
1817 | ;;; | |
1818 | ;;; utmpx. | |
1819 | ;;; | |
1820 | ||
1821 | (define-record-type <utmpx-entry> | |
1822 | (utmpx type pid line id user host termination exit | |
1823 | session time address) | |
1824 | utmpx? | |
1825 | (type utmpx-login-type) ;login-type | |
1826 | (pid utmpx-pid) | |
1827 | (line utmpx-line) ;device name | |
1828 | (id utmpx-id) | |
1829 | (user utmpx-user) ;user name | |
1830 | (host utmpx-host) ;host name | #f | |
1831 | (termination utmpx-termination-status) | |
1832 | (exit utmpx-exit-status) | |
1833 | (session utmpx-session-id) ;session ID, for windowing | |
1834 | (time utmpx-time) ;entry time | |
1835 | (address utmpx-address)) | |
1836 | ||
1837 | (define-c-struct %utmpx ;<utmpx.h> | |
1838 | sizeof-utmpx | |
1839 | (lambda (type pid line id user host termination exit session | |
1840 | seconds useconds address %reserved) | |
1841 | (utmpx type pid | |
1842 | (bytes->string line) id | |
1843 | (bytes->string user) | |
1844 | (bytes->string host) termination exit | |
1845 | session | |
1846 | (make-time time-utc (* 1000 useconds) seconds) | |
1847 | address)) | |
1848 | read-utmpx | |
1849 | write-utmpx! | |
1850 | (type short) | |
1851 | (pid int) | |
1852 | (line (array uint8 32)) | |
1853 | (id (array uint8 4)) | |
1854 | (user (array uint8 32)) | |
1855 | (host (array uint8 256)) | |
1856 | (termination short) | |
1857 | (exit short) | |
1858 | (session int32) | |
1859 | (time-seconds int32) | |
1860 | (time-useconds int32) | |
1861 | (address-v6 (array int32 4)) | |
1862 | (%reserved (array uint8 20))) | |
1863 | ||
1864 | (define-bits login-type | |
1865 | %unused-login-type->symbols | |
1866 | (define EMPTY 0) ;No valid user accounting information. | |
1867 | (define RUN_LVL 1) ;The system's runlevel. | |
1868 | (define BOOT_TIME 2) ;Time of system boot. | |
1869 | (define NEW_TIME 3) ;Time after system clock changed. | |
1870 | (define OLD_TIME 4) ;Time when system clock changed. | |
1871 | ||
1872 | (define INIT_PROCESS 5) ;Process spawned by the init process. | |
1873 | (define LOGIN_PROCESS 6) ;Session leader of a logged in user. | |
1874 | (define USER_PROCESS 7) ;Normal process. | |
1875 | (define DEAD_PROCESS 8) ;Terminated process. | |
1876 | ||
1877 | (define ACCOUNTING 9)) ;System accounting. | |
1878 | ||
1879 | (define setutxent | |
1880 | (let ((proc (syscall->procedure void "setutxent" '()))) | |
1881 | (lambda () | |
1882 | "Open the user accounting database." | |
1883 | (proc)))) | |
1884 | ||
1885 | (define endutxent | |
1886 | (let ((proc (syscall->procedure void "endutxent" '()))) | |
1887 | (lambda () | |
1888 | "Close the user accounting database." | |
1889 | (proc)))) | |
1890 | ||
1891 | (define getutxent | |
1892 | (let ((proc (syscall->procedure '* "getutxent" '()))) | |
1893 | (lambda () | |
1894 | "Return the next entry from the user accounting database." | |
1895 | (let ((ptr (proc))) | |
1896 | (if (null-pointer? ptr) | |
1897 | #f | |
1898 | (read-utmpx (pointer->bytevector ptr sizeof-utmpx))))))) | |
1899 | ||
1900 | (define (utmpx-entries) | |
1901 | "Return the list of entries read from the user accounting database." | |
1902 | (setutxent) | |
1903 | (let loop ((entries '())) | |
1904 | (match (getutxent) | |
1905 | (#f | |
1906 | (endutxent) | |
1907 | (reverse entries)) | |
1908 | ((? utmpx? entry) | |
1909 | (loop (cons entry entries)))))) | |
1910 | ||
3483f004 LC |
1911 | (define (read-utmpx-from-port port) |
1912 | "Read a utmpx entry from PORT. Return either the EOF object or a utmpx | |
1913 | entry." | |
1914 | (match (get-bytevector-n port sizeof-utmpx) | |
1915 | ((? eof-object? eof) | |
1916 | eof) | |
1917 | ((? bytevector? bv) | |
1918 | (read-utmpx bv)))) | |
1919 | ||
29fa45f4 | 1920 | ;;; syscalls.scm ends here |