]>
Commit | Line | Data |
---|---|---|
53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
57fa1d09 TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2008-2012 Kay Sievers <kay@vrfy.org> | |
6 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <ctype.h> | |
57fa1d09 | 23 | #include <net/if.h> |
07630cea | 24 | #include <sys/types.h> |
57fa1d09 | 25 | |
07630cea LP |
26 | #include "sd-device.h" |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
07630cea LP |
29 | #include "device-internal.h" |
30 | #include "device-private.h" | |
31 | #include "device-util.h" | |
8fb3f009 | 32 | #include "dirent-util.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
57fa1d09 | 34 | #include "fileio.h" |
f4f15635 | 35 | #include "fs-util.h" |
57fa1d09 | 36 | #include "hashmap.h" |
07630cea | 37 | #include "macro.h" |
6bedfcbb | 38 | #include "parse-util.h" |
07630cea | 39 | #include "path-util.h" |
57fa1d09 | 40 | #include "set.h" |
429b4350 | 41 | #include "socket-util.h" |
8fcde012 | 42 | #include "stat-util.h" |
07630cea | 43 | #include "string-util.h" |
57fa1d09 | 44 | #include "strv.h" |
07630cea LP |
45 | #include "strxcpyx.h" |
46 | #include "util.h" | |
57fa1d09 TG |
47 | |
48 | int device_new_aux(sd_device **ret) { | |
4afd3348 | 49 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
50 | |
51 | assert(ret); | |
52 | ||
53 | device = new0(sd_device, 1); | |
54 | if (!device) | |
55 | return -ENOMEM; | |
56 | ||
57 | device->n_ref = 1; | |
58 | device->watch_handle = -1; | |
59 | ||
60 | *ret = device; | |
61 | device = NULL; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | _public_ sd_device *sd_device_ref(sd_device *device) { | |
67 | if (device) | |
68 | assert_se(++ device->n_ref >= 2); | |
69 | ||
70 | return device; | |
71 | } | |
72 | ||
73 | _public_ sd_device *sd_device_unref(sd_device *device) { | |
74 | if (device && -- device->n_ref == 0) { | |
75 | sd_device_unref(device->parent); | |
76 | free(device->syspath); | |
77 | free(device->sysname); | |
78 | free(device->devtype); | |
79 | free(device->devname); | |
80 | free(device->subsystem); | |
de7e983e | 81 | free(device->driver_subsystem); |
57fa1d09 TG |
82 | free(device->driver); |
83 | free(device->id_filename); | |
84 | free(device->properties_strv); | |
85 | free(device->properties_nulstr); | |
86 | ||
87 | ordered_hashmap_free_free_free(device->properties); | |
88 | ordered_hashmap_free_free_free(device->properties_db); | |
89 | hashmap_free_free_free(device->sysattr_values); | |
90 | set_free_free(device->sysattrs); | |
91 | set_free_free(device->tags); | |
92 | set_free_free(device->devlinks); | |
93 | ||
94 | free(device); | |
95 | } | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
100 | int device_add_property_aux(sd_device *device, const char *_key, const char *_value, bool db) { | |
101 | OrderedHashmap **properties; | |
102 | ||
103 | assert(device); | |
104 | assert(_key); | |
105 | ||
106 | if (db) | |
107 | properties = &device->properties_db; | |
108 | else | |
109 | properties = &device->properties; | |
110 | ||
111 | if (_value) { | |
112 | _cleanup_free_ char *key = NULL, *value = NULL, *old_key = NULL, *old_value = NULL; | |
113 | int r; | |
114 | ||
115 | r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops); | |
116 | if (r < 0) | |
117 | return r; | |
118 | ||
119 | key = strdup(_key); | |
120 | if (!key) | |
121 | return -ENOMEM; | |
122 | ||
123 | value = strdup(_value); | |
124 | if (!value) | |
125 | return -ENOMEM; | |
126 | ||
127 | old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key); | |
128 | ||
129 | r = ordered_hashmap_replace(*properties, key, value); | |
130 | if (r < 0) | |
131 | return r; | |
132 | ||
133 | key = NULL; | |
134 | value = NULL; | |
135 | } else { | |
136 | _cleanup_free_ char *key = NULL; | |
137 | _cleanup_free_ char *value = NULL; | |
138 | ||
139 | value = ordered_hashmap_remove2(*properties, _key, (void**) &key); | |
140 | } | |
141 | ||
142 | if (!db) { | |
313cefa1 | 143 | device->properties_generation++; |
57fa1d09 TG |
144 | device->properties_buf_outdated = true; |
145 | } | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | int device_add_property_internal(sd_device *device, const char *key, const char *value) { | |
151 | return device_add_property_aux(device, key, value, false); | |
152 | } | |
153 | ||
154 | int device_set_syspath(sd_device *device, const char *_syspath, bool verify) { | |
155 | _cleanup_free_ char *syspath = NULL; | |
156 | const char *devpath; | |
157 | int r; | |
158 | ||
159 | assert(device); | |
160 | assert(_syspath); | |
161 | ||
162 | /* must be a subdirectory of /sys */ | |
163 | if (!path_startswith(_syspath, "/sys/")) { | |
164 | log_debug("sd-device: syspath '%s' is not a subdirectory of /sys", _syspath); | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | if (verify) { | |
e1873695 | 169 | r = readlink_and_canonicalize(_syspath, NULL, &syspath); |
08232a02 TG |
170 | if (r == -ENOENT) |
171 | /* the device does not exist (any more?) */ | |
172 | return -ENODEV; | |
173 | else if (r == -EINVAL) { | |
57fa1d09 TG |
174 | /* not a symlink */ |
175 | syspath = canonicalize_file_name(_syspath); | |
176 | if (!syspath) { | |
08232a02 TG |
177 | if (errno == ENOENT) |
178 | /* the device does not exist (any more?) */ | |
179 | return -ENODEV; | |
180 | ||
e53fc357 | 181 | return log_debug_errno(errno, "sd-device: could not canonicalize '%s': %m", _syspath); |
57fa1d09 | 182 | } |
08232a02 | 183 | } else if (r < 0) { |
23446f01 | 184 | log_debug_errno(r, "sd-device: could not get target of '%s': %m", _syspath); |
57fa1d09 TG |
185 | return r; |
186 | } | |
187 | ||
188 | if (path_startswith(syspath, "/sys/devices/")) { | |
189 | char *path; | |
190 | ||
191 | /* all 'devices' require an 'uevent' file */ | |
192 | path = strjoina(syspath, "/uevent"); | |
193 | r = access(path, F_OK); | |
194 | if (r < 0) { | |
52d62901 TG |
195 | if (errno == ENOENT) |
196 | /* this is not a valid device */ | |
197 | return -ENODEV; | |
198 | ||
25f027c5 | 199 | return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath); |
57fa1d09 TG |
200 | } |
201 | } else { | |
61233823 | 202 | /* everything else just needs to be a directory */ |
52d62901 TG |
203 | if (!is_dir(syspath, false)) |
204 | return -ENODEV; | |
57fa1d09 TG |
205 | } |
206 | } else { | |
207 | syspath = strdup(_syspath); | |
208 | if (!syspath) | |
209 | return -ENOMEM; | |
210 | } | |
211 | ||
212 | devpath = syspath + strlen("/sys"); | |
213 | ||
214 | r = device_add_property_internal(device, "DEVPATH", devpath); | |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
218 | free(device->syspath); | |
219 | device->syspath = syspath; | |
220 | syspath = NULL; | |
221 | ||
222 | device->devpath = devpath; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { | |
4afd3348 | 228 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
229 | int r; |
230 | ||
231 | assert_return(ret, -EINVAL); | |
232 | assert_return(syspath, -EINVAL); | |
233 | ||
234 | r = device_new_aux(&device); | |
235 | if (r < 0) | |
236 | return r; | |
237 | ||
238 | r = device_set_syspath(device, syspath, true); | |
239 | if (r < 0) | |
240 | return r; | |
241 | ||
242 | *ret = device; | |
243 | device = NULL; | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
249 | char *syspath; | |
250 | char id[DECIMAL_STR_MAX(unsigned) * 2 + 1]; | |
251 | ||
252 | assert_return(ret, -EINVAL); | |
945c2931 | 253 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); |
57fa1d09 TG |
254 | |
255 | /* use /sys/dev/{block,char}/<maj>:<min> link */ | |
256 | snprintf(id, sizeof(id), "%u:%u", major(devnum), minor(devnum)); | |
257 | ||
258 | syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id); | |
259 | ||
260 | return sd_device_new_from_syspath(ret, syspath); | |
261 | } | |
262 | ||
263 | _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) { | |
21d6220f TG |
264 | char *name, *syspath; |
265 | size_t len = 0; | |
57fa1d09 TG |
266 | |
267 | assert_return(ret, -EINVAL); | |
268 | assert_return(subsystem, -EINVAL); | |
269 | assert_return(sysname, -EINVAL); | |
270 | ||
271 | if (streq(subsystem, "subsystem")) { | |
272 | syspath = strjoina("/sys/subsystem/", sysname); | |
273 | if (access(syspath, F_OK) >= 0) | |
274 | return sd_device_new_from_syspath(ret, syspath); | |
275 | ||
276 | syspath = strjoina("/sys/bus/", sysname); | |
277 | if (access(syspath, F_OK) >= 0) | |
278 | return sd_device_new_from_syspath(ret, syspath); | |
279 | ||
280 | syspath = strjoina("/sys/class/", sysname); | |
281 | if (access(syspath, F_OK) >= 0) | |
282 | return sd_device_new_from_syspath(ret, syspath); | |
283 | } else if (streq(subsystem, "module")) { | |
284 | syspath = strjoina("/sys/module/", sysname); | |
285 | if (access(syspath, F_OK) >= 0) | |
286 | return sd_device_new_from_syspath(ret, syspath); | |
287 | } else if (streq(subsystem, "drivers")) { | |
288 | char subsys[PATH_MAX]; | |
289 | char *driver; | |
290 | ||
291 | strscpy(subsys, sizeof(subsys), sysname); | |
292 | driver = strchr(subsys, ':'); | |
293 | if (driver) { | |
294 | driver[0] = '\0'; | |
295 | driver++; | |
296 | ||
297 | syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver); | |
298 | if (access(syspath, F_OK) >= 0) | |
299 | return sd_device_new_from_syspath(ret, syspath); | |
300 | ||
301 | syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver); | |
302 | if (access(syspath, F_OK) >= 0) | |
303 | return sd_device_new_from_syspath(ret, syspath); | |
21d6220f TG |
304 | } |
305 | } | |
a9ec9f29 | 306 | |
21d6220f TG |
307 | /* translate sysname back to sysfs filename */ |
308 | name = strdupa(sysname); | |
309 | while (name[len] != '\0') { | |
310 | if (name[len] == '/') | |
311 | name[len] = '!'; | |
a9ec9f29 | 312 | |
21d6220f TG |
313 | len++; |
314 | } | |
a9ec9f29 | 315 | |
21d6220f TG |
316 | syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name); |
317 | if (access(syspath, F_OK) >= 0) | |
318 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 319 | |
21d6220f TG |
320 | syspath = strjoina("/sys/bus/", subsystem, "/devices/", name); |
321 | if (access(syspath, F_OK) >= 0) | |
322 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 323 | |
21d6220f TG |
324 | syspath = strjoina("/sys/class/", subsystem, "/", name); |
325 | if (access(syspath, F_OK) >= 0) | |
326 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 327 | |
a918b673 PK |
328 | syspath = strjoina("/sys/firmware/", subsystem, "/", sysname); |
329 | if (access(syspath, F_OK) >= 0) | |
330 | return sd_device_new_from_syspath(ret, syspath); | |
331 | ||
08232a02 | 332 | return -ENODEV; |
57fa1d09 TG |
333 | } |
334 | ||
335 | int device_set_devtype(sd_device *device, const char *_devtype) { | |
336 | _cleanup_free_ char *devtype = NULL; | |
337 | int r; | |
338 | ||
339 | assert(device); | |
340 | assert(_devtype); | |
341 | ||
342 | devtype = strdup(_devtype); | |
343 | if (!devtype) | |
344 | return -ENOMEM; | |
345 | ||
346 | r = device_add_property_internal(device, "DEVTYPE", devtype); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | free(device->devtype); | |
351 | device->devtype = devtype; | |
352 | devtype = NULL; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | int device_set_ifindex(sd_device *device, const char *_ifindex) { | |
358 | int ifindex, r; | |
359 | ||
360 | assert(device); | |
361 | assert(_ifindex); | |
362 | ||
6ad623a3 | 363 | r = parse_ifindex(_ifindex, &ifindex); |
57fa1d09 TG |
364 | if (r < 0) |
365 | return r; | |
366 | ||
57fa1d09 TG |
367 | r = device_add_property_internal(device, "IFINDEX", _ifindex); |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
371 | device->ifindex = ifindex; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | int device_set_devname(sd_device *device, const char *_devname) { | |
377 | _cleanup_free_ char *devname = NULL; | |
378 | int r; | |
379 | ||
380 | assert(device); | |
381 | assert(_devname); | |
382 | ||
383 | if (_devname[0] != '/') { | |
384 | r = asprintf(&devname, "/dev/%s", _devname); | |
385 | if (r < 0) | |
386 | return -ENOMEM; | |
387 | } else { | |
388 | devname = strdup(_devname); | |
389 | if (!devname) | |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
393 | r = device_add_property_internal(device, "DEVNAME", devname); | |
394 | if (r < 0) | |
395 | return r; | |
396 | ||
397 | free(device->devname); | |
398 | device->devname = devname; | |
399 | devname = NULL; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
405 | unsigned devmode; | |
406 | int r; | |
407 | ||
408 | assert(device); | |
409 | assert(_devmode); | |
410 | ||
411 | r = safe_atou(_devmode, &devmode); | |
412 | if (r < 0) | |
413 | return r; | |
414 | ||
415 | if (devmode > 07777) | |
416 | return -EINVAL; | |
417 | ||
418 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
419 | if (r < 0) | |
420 | return r; | |
421 | ||
422 | device->devmode = devmode; | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
428 | unsigned maj = 0, min = 0; | |
429 | int r; | |
430 | ||
431 | assert(device); | |
432 | assert(major); | |
433 | ||
434 | r = safe_atou(major, &maj); | |
435 | if (r < 0) | |
436 | return r; | |
437 | if (!maj) | |
438 | return 0; | |
439 | ||
440 | if (minor) { | |
441 | r = safe_atou(minor, &min); | |
442 | if (r < 0) | |
443 | return r; | |
444 | } | |
445 | ||
446 | r = device_add_property_internal(device, "MAJOR", major); | |
447 | if (r < 0) | |
448 | return r; | |
449 | ||
450 | if (minor) { | |
451 | r = device_add_property_internal(device, "MINOR", minor); | |
452 | if (r < 0) | |
453 | return r; | |
454 | } | |
455 | ||
456 | device->devnum = makedev(maj, min); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) { | |
462 | int r; | |
463 | ||
464 | assert(device); | |
465 | assert(key); | |
466 | assert(value); | |
467 | assert(major); | |
468 | assert(minor); | |
469 | ||
470 | if (streq(key, "DEVTYPE")) { | |
471 | r = device_set_devtype(device, value); | |
472 | if (r < 0) | |
473 | return r; | |
474 | } else if (streq(key, "IFINDEX")) { | |
475 | r = device_set_ifindex(device, value); | |
476 | if (r < 0) | |
477 | return r; | |
478 | } else if (streq(key, "DEVNAME")) { | |
479 | r = device_set_devname(device, value); | |
480 | if (r < 0) | |
481 | return r; | |
482 | } else if (streq(key, "DEVMODE")) { | |
483 | r = device_set_devmode(device, value); | |
484 | if (r < 0) | |
485 | return r; | |
486 | } else if (streq(key, "MAJOR")) | |
487 | *major = value; | |
488 | else if (streq(key, "MINOR")) | |
489 | *minor = value; | |
490 | else { | |
491 | r = device_add_property_internal(device, key, value); | |
492 | if (r < 0) | |
493 | return r; | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | int device_read_uevent_file(sd_device *device) { | |
500 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 501 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
502 | char *path; |
503 | size_t uevent_len; | |
504 | unsigned i; | |
505 | int r; | |
506 | ||
507 | enum { | |
508 | PRE_KEY, | |
509 | KEY, | |
510 | PRE_VALUE, | |
511 | VALUE, | |
512 | INVALID_LINE, | |
513 | } state = PRE_KEY; | |
514 | ||
515 | assert(device); | |
516 | ||
517 | if (device->uevent_loaded || device->sealed) | |
518 | return 0; | |
519 | ||
7141e4f6 TG |
520 | device->uevent_loaded = true; |
521 | ||
57fa1d09 TG |
522 | r = sd_device_get_syspath(device, &syspath); |
523 | if (r < 0) | |
524 | return r; | |
525 | ||
526 | path = strjoina(syspath, "/uevent"); | |
527 | ||
528 | r = read_full_file(path, &uevent, &uevent_len); | |
bba06166 TG |
529 | if (r == -EACCES) |
530 | /* empty uevent files may be write-only */ | |
531 | return 0; | |
2a213740 TG |
532 | else if (r == -ENOENT) |
533 | /* some devices may not have uevent files, see set_syspath() */ | |
534 | return 0; | |
bba06166 | 535 | else if (r < 0) { |
e53fc357 | 536 | log_debug_errno(r, "sd-device: failed to read uevent file '%s': %m", path); |
57fa1d09 TG |
537 | return r; |
538 | } | |
539 | ||
755700bb | 540 | for (i = 0; i < uevent_len; i++) |
57fa1d09 TG |
541 | switch (state) { |
542 | case PRE_KEY: | |
543 | if (!strchr(NEWLINE, uevent[i])) { | |
544 | key = &uevent[i]; | |
545 | ||
546 | state = KEY; | |
547 | } | |
548 | ||
549 | break; | |
550 | case KEY: | |
551 | if (uevent[i] == '=') { | |
552 | uevent[i] = '\0'; | |
553 | ||
554 | state = PRE_VALUE; | |
555 | } else if (strchr(NEWLINE, uevent[i])) { | |
556 | uevent[i] = '\0'; | |
557 | log_debug("sd-device: ignoring invalid uevent line '%s'", key); | |
558 | ||
559 | state = PRE_KEY; | |
560 | } | |
561 | ||
562 | break; | |
563 | case PRE_VALUE: | |
564 | value = &uevent[i]; | |
57fa1d09 TG |
565 | state = VALUE; |
566 | ||
4831981d | 567 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
568 | case VALUE: |
569 | if (strchr(NEWLINE, uevent[i])) { | |
570 | uevent[i] = '\0'; | |
571 | ||
572 | r = handle_uevent_line(device, key, value, &major, &minor); | |
573 | if (r < 0) | |
19c29853 | 574 | log_debug_errno(r, "sd-device: failed to handle uevent entry '%s=%s': %m", key, value); |
57fa1d09 TG |
575 | |
576 | state = PRE_KEY; | |
577 | } | |
578 | ||
579 | break; | |
580 | default: | |
581 | assert_not_reached("invalid state when parsing uevent file"); | |
582 | } | |
57fa1d09 TG |
583 | |
584 | if (major) { | |
585 | r = device_set_devnum(device, major, minor); | |
586 | if (r < 0) | |
23446f01 | 587 | log_debug_errno(r, "sd-device: could not set 'MAJOR=%s' or 'MINOR=%s' from '%s': %m", major, minor, path); |
57fa1d09 TG |
588 | } |
589 | ||
57fa1d09 TG |
590 | return 0; |
591 | } | |
592 | ||
593 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
594 | int r; | |
595 | ||
596 | assert_return(device, -EINVAL); | |
597 | assert_return(ifindex, -EINVAL); | |
598 | ||
599 | r = device_read_uevent_file(device); | |
600 | if (r < 0) | |
601 | return r; | |
602 | ||
603 | *ifindex = device->ifindex; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
609 | int r; | |
610 | ||
611 | assert_return(ret, -EINVAL); | |
612 | assert_return(id, -EINVAL); | |
613 | ||
614 | switch (id[0]) { | |
615 | case 'b': | |
616 | case 'c': | |
617 | { | |
618 | char type; | |
619 | int maj, min; | |
620 | ||
621 | r = sscanf(id, "%c%i:%i", &type, &maj, &min); | |
622 | if (r != 3) | |
623 | return -EINVAL; | |
624 | ||
625 | return sd_device_new_from_devnum(ret, type, makedev(maj, min)); | |
626 | } | |
627 | case 'n': | |
628 | { | |
4afd3348 | 629 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
630 | _cleanup_close_ int sk = -1; |
631 | struct ifreq ifr = {}; | |
632 | int ifindex; | |
633 | ||
6ad623a3 | 634 | r = parse_ifindex(&id[1], &ifr.ifr_ifindex); |
57fa1d09 TG |
635 | if (r < 0) |
636 | return r; | |
57fa1d09 | 637 | |
429b4350 | 638 | sk = socket_ioctl_fd(); |
57fa1d09 | 639 | if (sk < 0) |
429b4350 | 640 | return sk; |
57fa1d09 TG |
641 | |
642 | r = ioctl(sk, SIOCGIFNAME, &ifr); | |
643 | if (r < 0) | |
644 | return -errno; | |
645 | ||
646 | r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name); | |
647 | if (r < 0) | |
648 | return r; | |
649 | ||
650 | r = sd_device_get_ifindex(device, &ifindex); | |
651 | if (r < 0) | |
652 | return r; | |
653 | ||
08232a02 | 654 | /* this is racey, so we might end up with the wrong device */ |
57fa1d09 TG |
655 | if (ifr.ifr_ifindex != ifindex) |
656 | return -ENODEV; | |
657 | ||
658 | *ret = device; | |
659 | device = NULL; | |
660 | ||
661 | return 0; | |
662 | } | |
663 | case '+': | |
664 | { | |
665 | char subsys[PATH_MAX]; | |
666 | char *sysname; | |
667 | ||
668 | (void)strscpy(subsys, sizeof(subsys), id + 1); | |
669 | sysname = strchr(subsys, ':'); | |
670 | if (!sysname) | |
671 | return -EINVAL; | |
672 | ||
673 | sysname[0] = '\0'; | |
313cefa1 | 674 | sysname++; |
57fa1d09 TG |
675 | |
676 | return sd_device_new_from_subsystem_sysname(ret, subsys, sysname); | |
677 | } | |
678 | default: | |
679 | return -EINVAL; | |
680 | } | |
681 | } | |
682 | ||
683 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
684 | assert_return(device, -EINVAL); | |
685 | assert_return(ret, -EINVAL); | |
686 | ||
687 | assert(path_startswith(device->syspath, "/sys/")); | |
688 | ||
689 | *ret = device->syspath; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static int device_new_from_child(sd_device **ret, sd_device *child) { | |
695 | _cleanup_free_ char *path = NULL; | |
696 | const char *subdir, *syspath; | |
697 | int r; | |
698 | ||
699 | assert(ret); | |
700 | assert(child); | |
701 | ||
702 | r = sd_device_get_syspath(child, &syspath); | |
703 | if (r < 0) | |
704 | return r; | |
705 | ||
706 | path = strdup(syspath); | |
707 | if (!path) | |
708 | return -ENOMEM; | |
709 | subdir = path + strlen("/sys"); | |
710 | ||
711 | for (;;) { | |
712 | char *pos; | |
713 | ||
714 | pos = strrchr(subdir, '/'); | |
715 | if (!pos || pos < subdir + 2) | |
716 | break; | |
717 | ||
718 | *pos = '\0'; | |
719 | ||
720 | r = sd_device_new_from_syspath(ret, path); | |
721 | if (r < 0) | |
722 | continue; | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
08232a02 | 727 | return -ENODEV; |
57fa1d09 TG |
728 | } |
729 | ||
730 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
731 | ||
732 | assert_return(ret, -EINVAL); | |
733 | assert_return(child, -EINVAL); | |
734 | ||
735 | if (!child->parent_set) { | |
736 | child->parent_set = true; | |
737 | ||
738 | (void)device_new_from_child(&child->parent, child); | |
739 | } | |
740 | ||
741 | if (!child->parent) | |
742 | return -ENOENT; | |
743 | ||
744 | *ret = child->parent; | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | int device_set_subsystem(sd_device *device, const char *_subsystem) { | |
750 | _cleanup_free_ char *subsystem = NULL; | |
751 | int r; | |
752 | ||
753 | assert(device); | |
754 | assert(_subsystem); | |
755 | ||
756 | subsystem = strdup(_subsystem); | |
757 | if (!subsystem) | |
758 | return -ENOMEM; | |
759 | ||
760 | r = device_add_property_internal(device, "SUBSYSTEM", subsystem); | |
761 | if (r < 0) | |
762 | return r; | |
763 | ||
764 | free(device->subsystem); | |
765 | device->subsystem = subsystem; | |
766 | subsystem = NULL; | |
767 | ||
768 | device->subsystem_set = true; | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
de7e983e TG |
773 | static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) { |
774 | _cleanup_free_ char *subsystem = NULL; | |
775 | int r; | |
776 | ||
777 | assert(device); | |
778 | assert(_subsystem); | |
779 | assert(*_subsystem); | |
780 | ||
781 | subsystem = strdup(_subsystem); | |
782 | if (!subsystem) | |
783 | return -ENOMEM; | |
784 | ||
785 | r = device_set_subsystem(device, "drivers"); | |
786 | if (r < 0) | |
787 | return r; | |
788 | ||
789 | free(device->driver_subsystem); | |
790 | device->driver_subsystem = subsystem; | |
791 | subsystem = NULL; | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
57fa1d09 | 796 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
797 | const char *syspath, *drivers = NULL; |
798 | int r; | |
799 | ||
57fa1d09 TG |
800 | assert_return(ret, -EINVAL); |
801 | assert_return(device, -EINVAL); | |
802 | ||
de7e983e TG |
803 | r = sd_device_get_syspath(device, &syspath); |
804 | if (r < 0) | |
805 | return r; | |
806 | ||
57fa1d09 TG |
807 | if (!device->subsystem_set) { |
808 | _cleanup_free_ char *subsystem = NULL; | |
57fa1d09 | 809 | char *path; |
57fa1d09 TG |
810 | |
811 | /* read 'subsystem' link */ | |
57fa1d09 TG |
812 | path = strjoina(syspath, "/subsystem"); |
813 | r = readlink_value(path, &subsystem); | |
814 | if (r >= 0) | |
815 | r = device_set_subsystem(device, subsystem); | |
816 | /* use implicit names */ | |
817 | else if (path_startswith(device->devpath, "/module/")) | |
818 | r = device_set_subsystem(device, "module"); | |
de7e983e TG |
819 | else if (!(drivers = strstr(syspath, "/drivers/")) && |
820 | (path_startswith(device->devpath, "/subsystem/") || | |
821 | path_startswith(device->devpath, "/class/") || | |
822 | path_startswith(device->devpath, "/bus/"))) | |
57fa1d09 | 823 | r = device_set_subsystem(device, "subsystem"); |
4189708a | 824 | if (r < 0 && r != -ENOENT) |
5a917c06 | 825 | return log_debug_errno(r, "sd-device: could not set subsystem for %s: %m", device->devpath); |
57fa1d09 TG |
826 | |
827 | device->subsystem_set = true; | |
de7e983e TG |
828 | } else if (!device->driver_subsystem_set) |
829 | drivers = strstr(syspath, "/drivers/"); | |
830 | ||
831 | if (!device->driver_subsystem_set) { | |
832 | if (drivers) { | |
833 | _cleanup_free_ char *subpath = NULL; | |
834 | ||
835 | subpath = strndup(syspath, drivers - syspath); | |
836 | if (!subpath) | |
837 | r = -ENOMEM; | |
838 | else { | |
839 | const char *subsys; | |
840 | ||
841 | subsys = strrchr(subpath, '/'); | |
842 | if (!subsys) | |
843 | r = -EINVAL; | |
844 | else | |
845 | r = device_set_drivers_subsystem(device, subsys + 1); | |
846 | } | |
847 | if (r < 0 && r != -ENOENT) | |
848 | return log_debug_errno(r, "sd-device: could not set subsystem for driver %s: %m", device->devpath); | |
849 | } | |
850 | ||
851 | device->driver_subsystem_set = true; | |
57fa1d09 TG |
852 | } |
853 | ||
bf4c113e DH |
854 | if (!device->subsystem) |
855 | return -ENOENT; | |
856 | ||
57fa1d09 TG |
857 | *ret = device->subsystem; |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
863 | int r; | |
864 | ||
865 | assert(devtype); | |
866 | assert(device); | |
867 | ||
868 | r = device_read_uevent_file(device); | |
869 | if (r < 0) | |
870 | return r; | |
871 | ||
872 | *devtype = device->devtype; | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
877 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
878 | sd_device *parent = NULL; | |
879 | int r; | |
880 | ||
881 | assert_return(child, -EINVAL); | |
882 | assert_return(subsystem, -EINVAL); | |
883 | ||
884 | r = sd_device_get_parent(child, &parent); | |
885 | while (r >= 0) { | |
886 | const char *parent_subsystem = NULL; | |
887 | const char *parent_devtype = NULL; | |
888 | ||
889 | (void)sd_device_get_subsystem(parent, &parent_subsystem); | |
890 | if (streq_ptr(parent_subsystem, subsystem)) { | |
891 | if (!devtype) | |
892 | break; | |
893 | ||
894 | (void)sd_device_get_devtype(parent, &parent_devtype); | |
895 | if (streq_ptr(parent_devtype, devtype)) | |
896 | break; | |
897 | } | |
898 | r = sd_device_get_parent(parent, &parent); | |
899 | } | |
900 | ||
901 | if (r < 0) | |
902 | return r; | |
903 | ||
904 | *ret = parent; | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
910 | int r; | |
911 | ||
912 | assert_return(device, -EINVAL); | |
913 | assert_return(devnum, -EINVAL); | |
914 | ||
915 | r = device_read_uevent_file(device); | |
916 | if (r < 0) | |
917 | return r; | |
918 | ||
919 | *devnum = device->devnum; | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | int device_set_driver(sd_device *device, const char *_driver) { | |
925 | _cleanup_free_ char *driver = NULL; | |
926 | int r; | |
927 | ||
928 | assert(device); | |
929 | assert(_driver); | |
930 | ||
931 | driver = strdup(_driver); | |
932 | if (!driver) | |
933 | return -ENOMEM; | |
934 | ||
935 | r = device_add_property_internal(device, "DRIVER", driver); | |
936 | if (r < 0) | |
937 | return r; | |
938 | ||
939 | free(device->driver); | |
940 | device->driver = driver; | |
941 | driver = NULL; | |
942 | ||
943 | device->driver_set = true; | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
948 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
949 | assert_return(device, -EINVAL); | |
950 | assert_return(ret, -EINVAL); | |
951 | ||
952 | if (!device->driver_set) { | |
953 | _cleanup_free_ char *driver = NULL; | |
954 | const char *syspath; | |
955 | char *path; | |
956 | int r; | |
957 | ||
958 | r = sd_device_get_syspath(device, &syspath); | |
959 | if (r < 0) | |
960 | return r; | |
961 | ||
962 | path = strjoina(syspath, "/driver"); | |
963 | r = readlink_value(path, &driver); | |
964 | if (r >= 0) { | |
965 | r = device_set_driver(device, driver); | |
966 | if (r < 0) | |
7283a80d TG |
967 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); |
968 | } else if (r == -ENOENT) | |
969 | device->driver_set = true; | |
970 | else | |
971 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); | |
57fa1d09 TG |
972 | } |
973 | ||
bf4c113e DH |
974 | if (!device->driver) |
975 | return -ENOENT; | |
976 | ||
57fa1d09 TG |
977 | *ret = device->driver; |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | _public_ int sd_device_get_devpath(sd_device *device, const char **devpath) { | |
983 | assert_return(device, -EINVAL); | |
984 | assert_return(devpath, -EINVAL); | |
985 | ||
986 | assert(device->devpath); | |
987 | assert(device->devpath[0] == '/'); | |
988 | ||
989 | *devpath = device->devpath; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
995 | int r; | |
996 | ||
997 | assert_return(device, -EINVAL); | |
998 | assert_return(devname, -EINVAL); | |
999 | ||
1000 | r = device_read_uevent_file(device); | |
1001 | if (r < 0) | |
1002 | return r; | |
1003 | ||
1004 | if (!device->devname) | |
1005 | return -ENOENT; | |
1006 | ||
1007 | assert(path_startswith(device->devname, "/dev/")); | |
1008 | ||
1009 | *devname = device->devname; | |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | static int device_set_sysname(sd_device *device) { | |
1015 | _cleanup_free_ char *sysname = NULL; | |
afcac065 | 1016 | const char *sysnum = NULL; |
57fa1d09 TG |
1017 | const char *pos; |
1018 | size_t len = 0; | |
1019 | ||
1020 | pos = strrchr(device->devpath, '/'); | |
1021 | if (!pos) | |
1022 | return -EINVAL; | |
313cefa1 | 1023 | pos++; |
57fa1d09 TG |
1024 | |
1025 | /* devpath is not a root directory */ | |
1026 | if (*pos == '\0' || pos <= device->devpath) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | sysname = strdup(pos); | |
1030 | if (!sysname) | |
1031 | return -ENOMEM; | |
1032 | ||
1033 | /* some devices have '!' in their name, change that to '/' */ | |
1034 | while (sysname[len] != '\0') { | |
1035 | if (sysname[len] == '!') | |
1036 | sysname[len] = '/'; | |
1037 | ||
313cefa1 | 1038 | len++; |
57fa1d09 TG |
1039 | } |
1040 | ||
1041 | /* trailing number */ | |
1042 | while (len > 0 && isdigit(sysname[--len])) | |
1043 | sysnum = &sysname[len]; | |
1044 | ||
1045 | if (len == 0) | |
1046 | sysnum = NULL; | |
1047 | ||
1048 | free(device->sysname); | |
1049 | device->sysname = sysname; | |
1050 | sysname = NULL; | |
1051 | ||
1052 | device->sysnum = sysnum; | |
1053 | ||
1054 | device->sysname_set = true; | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1060 | int r; | |
1061 | ||
1062 | assert_return(device, -EINVAL); | |
1063 | assert_return(ret, -EINVAL); | |
1064 | ||
1065 | if (!device->sysname_set) { | |
1066 | r = device_set_sysname(device); | |
1067 | if (r < 0) | |
1068 | return r; | |
1069 | } | |
1070 | ||
bf4c113e DH |
1071 | assert_return(device->sysname, -ENOENT); |
1072 | ||
57fa1d09 TG |
1073 | *ret = device->sysname; |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1079 | int r; | |
1080 | ||
1081 | assert_return(device, -EINVAL); | |
1082 | assert_return(ret, -EINVAL); | |
1083 | ||
1084 | if (!device->sysname_set) { | |
1085 | r = device_set_sysname(device); | |
1086 | if (r < 0) | |
1087 | return r; | |
1088 | } | |
1089 | ||
1090 | *ret = device->sysnum; | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | static bool is_valid_tag(const char *tag) { | |
1096 | assert(tag); | |
1097 | ||
1098 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1099 | } | |
1100 | ||
1101 | int device_add_tag(sd_device *device, const char *tag) { | |
1102 | int r; | |
1103 | ||
1104 | assert(device); | |
1105 | assert(tag); | |
1106 | ||
1107 | if (!is_valid_tag(tag)) | |
1108 | return -EINVAL; | |
1109 | ||
1110 | r = set_ensure_allocated(&device->tags, &string_hash_ops); | |
1111 | if (r < 0) | |
1112 | return r; | |
1113 | ||
1114 | r = set_put_strdup(device->tags, tag); | |
1115 | if (r < 0) | |
1116 | return r; | |
1117 | ||
313cefa1 | 1118 | device->tags_generation++; |
57fa1d09 TG |
1119 | device->property_tags_outdated = true; |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | int device_add_devlink(sd_device *device, const char *devlink) { | |
1125 | int r; | |
1126 | ||
1127 | assert(device); | |
1128 | assert(devlink); | |
1129 | ||
1130 | r = set_ensure_allocated(&device->devlinks, &string_hash_ops); | |
1131 | if (r < 0) | |
1132 | return r; | |
1133 | ||
1134 | r = set_put_strdup(device->devlinks, devlink); | |
1135 | if (r < 0) | |
1136 | return r; | |
1137 | ||
313cefa1 | 1138 | device->devlinks_generation++; |
57fa1d09 TG |
1139 | device->property_devlinks_outdated = true; |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { | |
1145 | _cleanup_free_ char *key = NULL; | |
1146 | char *value; | |
1147 | ||
1148 | assert(device); | |
1149 | assert(str); | |
1150 | ||
1151 | key = strdup(str); | |
1152 | if (!key) | |
1153 | return -ENOMEM; | |
1154 | ||
1155 | value = strchr(key, '='); | |
1156 | if (!value) | |
1157 | return -EINVAL; | |
1158 | ||
1159 | *value = '\0'; | |
1160 | ||
1161 | if (isempty(++value)) | |
1162 | value = NULL; | |
1163 | ||
1164 | return device_add_property_internal(device, key, value); | |
1165 | } | |
1166 | ||
1167 | int device_set_usec_initialized(sd_device *device, const char *initialized) { | |
1168 | uint64_t usec_initialized; | |
1169 | int r; | |
1170 | ||
1171 | assert(device); | |
1172 | assert(initialized); | |
1173 | ||
1174 | r = safe_atou64(initialized, &usec_initialized); | |
1175 | if (r < 0) | |
1176 | return r; | |
1177 | ||
1178 | r = device_add_property_internal(device, "USEC_INITIALIZED", initialized); | |
1179 | if (r < 0) | |
1180 | return r; | |
1181 | ||
1182 | device->usec_initialized = usec_initialized; | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
1188 | char *path; | |
1189 | int r; | |
1190 | ||
1191 | assert(device); | |
1192 | assert(value); | |
1193 | ||
1194 | switch (key) { | |
1195 | case 'G': | |
1196 | r = device_add_tag(device, value); | |
1197 | if (r < 0) | |
1198 | return r; | |
1199 | ||
1200 | break; | |
1201 | case 'S': | |
1202 | path = strjoina("/dev/", value); | |
1203 | r = device_add_devlink(device, path); | |
1204 | if (r < 0) | |
1205 | return r; | |
1206 | ||
1207 | break; | |
1208 | case 'E': | |
1209 | r = device_add_property_internal_from_string(device, value); | |
1210 | if (r < 0) | |
1211 | return r; | |
1212 | ||
1213 | break; | |
1214 | case 'I': | |
1215 | r = device_set_usec_initialized(device, value); | |
1216 | if (r < 0) | |
1217 | return r; | |
1218 | ||
1219 | break; | |
1220 | case 'L': | |
1221 | r = safe_atoi(value, &device->devlink_priority); | |
1222 | if (r < 0) | |
1223 | return r; | |
1224 | ||
1225 | break; | |
1226 | case 'W': | |
1227 | r = safe_atoi(value, &device->watch_handle); | |
1228 | if (r < 0) | |
1229 | return r; | |
1230 | ||
1231 | break; | |
1232 | default: | |
1233 | log_debug("device db: unknown key '%c'", key); | |
1234 | } | |
1235 | ||
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | int device_get_id_filename(sd_device *device, const char **ret) { | |
1240 | assert(device); | |
1241 | assert(ret); | |
1242 | ||
1243 | if (!device->id_filename) { | |
1244 | _cleanup_free_ char *id = NULL; | |
1245 | const char *subsystem; | |
1246 | dev_t devnum; | |
1247 | int ifindex, r; | |
1248 | ||
1249 | r = sd_device_get_subsystem(device, &subsystem); | |
1250 | if (r < 0) | |
1251 | return r; | |
1252 | ||
1253 | r = sd_device_get_devnum(device, &devnum); | |
1254 | if (r < 0) | |
1255 | return r; | |
1256 | ||
1257 | r = sd_device_get_ifindex(device, &ifindex); | |
1258 | if (r < 0) | |
1259 | return r; | |
1260 | ||
1261 | if (major(devnum) > 0) { | |
4189708a TG |
1262 | assert(subsystem); |
1263 | ||
ccddd104 | 1264 | /* use dev_t — b259:131072, c254:0 */ |
57fa1d09 TG |
1265 | r = asprintf(&id, "%c%u:%u", |
1266 | streq(subsystem, "block") ? 'b' : 'c', | |
1267 | major(devnum), minor(devnum)); | |
1268 | if (r < 0) | |
53fae771 | 1269 | return -ENOMEM; |
57fa1d09 | 1270 | } else if (ifindex > 0) { |
ccddd104 | 1271 | /* use netdev ifindex — n3 */ |
57fa1d09 TG |
1272 | r = asprintf(&id, "n%u", ifindex); |
1273 | if (r < 0) | |
53fae771 | 1274 | return -ENOMEM; |
57fa1d09 | 1275 | } else { |
ccddd104 | 1276 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
57fa1d09 TG |
1277 | * sysname() has '!' translated, get it from devpath |
1278 | */ | |
1279 | const char *sysname; | |
1280 | ||
1281 | sysname = basename(device->devpath); | |
1282 | if (!sysname) | |
4189708a TG |
1283 | return -EINVAL; |
1284 | ||
1285 | if (!subsystem) | |
57fa1d09 TG |
1286 | return -EINVAL; |
1287 | ||
de7e983e TG |
1288 | if (streq(subsystem, "drivers")) { |
1289 | /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem | |
1290 | * encoded as well */ | |
1291 | r = asprintf(&id, "+drivers:%s:%s", device->driver_subsystem, sysname); | |
1292 | if (r < 0) | |
1293 | return -ENOMEM; | |
1294 | } else { | |
1295 | r = asprintf(&id, "+%s:%s", subsystem, sysname); | |
1296 | if (r < 0) | |
1297 | return -ENOMEM; | |
1298 | } | |
57fa1d09 TG |
1299 | } |
1300 | ||
1301 | device->id_filename = id; | |
1302 | id = NULL; | |
1303 | } | |
1304 | ||
1305 | *ret = device->id_filename; | |
1306 | ||
1307 | return 0; | |
1308 | } | |
1309 | ||
107f2e25 | 1310 | int device_read_db_aux(sd_device *device, bool force) { |
57fa1d09 TG |
1311 | _cleanup_free_ char *db = NULL; |
1312 | char *path; | |
1313 | const char *id, *value; | |
1314 | char key; | |
1315 | size_t db_len; | |
1316 | unsigned i; | |
1317 | int r; | |
1318 | ||
1319 | enum { | |
1320 | PRE_KEY, | |
1321 | KEY, | |
1322 | PRE_VALUE, | |
1323 | VALUE, | |
1324 | INVALID_LINE, | |
1325 | } state = PRE_KEY; | |
1326 | ||
107f2e25 | 1327 | if (device->db_loaded || (!force && device->sealed)) |
57fa1d09 TG |
1328 | return 0; |
1329 | ||
7141e4f6 TG |
1330 | device->db_loaded = true; |
1331 | ||
57fa1d09 TG |
1332 | r = device_get_id_filename(device, &id); |
1333 | if (r < 0) | |
1334 | return r; | |
1335 | ||
1336 | path = strjoina("/run/udev/data/", id); | |
1337 | ||
1338 | r = read_full_file(path, &db, &db_len); | |
1339 | if (r < 0) { | |
1340 | if (r == -ENOENT) | |
1341 | return 0; | |
e53fc357 LP |
1342 | else |
1343 | return log_debug_errno(r, "sd-device: failed to read db '%s': %m", path); | |
57fa1d09 TG |
1344 | } |
1345 | ||
1346 | /* devices with a database entry are initialized */ | |
7e518afa | 1347 | device->is_initialized = true; |
57fa1d09 TG |
1348 | |
1349 | for (i = 0; i < db_len; i++) { | |
1350 | switch (state) { | |
1351 | case PRE_KEY: | |
1352 | if (!strchr(NEWLINE, db[i])) { | |
1353 | key = db[i]; | |
1354 | ||
1355 | state = KEY; | |
1356 | } | |
1357 | ||
1358 | break; | |
1359 | case KEY: | |
1360 | if (db[i] != ':') { | |
1361 | log_debug("sd-device: ignoring invalid db entry with key '%c'", key); | |
1362 | ||
1363 | state = INVALID_LINE; | |
1364 | } else { | |
1365 | db[i] = '\0'; | |
1366 | ||
1367 | state = PRE_VALUE; | |
1368 | } | |
1369 | ||
1370 | break; | |
1371 | case PRE_VALUE: | |
1372 | value = &db[i]; | |
1373 | ||
1374 | state = VALUE; | |
1375 | ||
1376 | break; | |
1377 | case INVALID_LINE: | |
1378 | if (strchr(NEWLINE, db[i])) | |
1379 | state = PRE_KEY; | |
1380 | ||
1381 | break; | |
1382 | case VALUE: | |
1383 | if (strchr(NEWLINE, db[i])) { | |
1384 | db[i] = '\0'; | |
1385 | r = handle_db_line(device, key, value); | |
1386 | if (r < 0) | |
19c29853 | 1387 | log_debug_errno(r, "sd-device: failed to handle db entry '%c:%s': %m", key, value); |
57fa1d09 TG |
1388 | |
1389 | state = PRE_KEY; | |
1390 | } | |
1391 | ||
1392 | break; | |
1393 | default: | |
1394 | assert_not_reached("invalid state when parsing db"); | |
1395 | } | |
1396 | } | |
1397 | ||
57fa1d09 TG |
1398 | return 0; |
1399 | } | |
1400 | ||
107f2e25 TG |
1401 | static int device_read_db(sd_device *device) { |
1402 | return device_read_db_aux(device, false); | |
1403 | } | |
1404 | ||
57fa1d09 TG |
1405 | _public_ int sd_device_get_is_initialized(sd_device *device, int *initialized) { |
1406 | int r; | |
1407 | ||
1408 | assert_return(device, -EINVAL); | |
1409 | assert_return(initialized, -EINVAL); | |
1410 | ||
1411 | r = device_read_db(device); | |
1412 | if (r < 0) | |
1413 | return r; | |
1414 | ||
1415 | *initialized = device->is_initialized; | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) { | |
1421 | usec_t now_ts; | |
1422 | int r; | |
1423 | ||
1424 | assert_return(device, -EINVAL); | |
1425 | assert_return(usec, -EINVAL); | |
1426 | ||
1427 | r = device_read_db(device); | |
1428 | if (r < 0) | |
1429 | return r; | |
1430 | ||
1431 | if (!device->is_initialized) | |
1432 | return -EBUSY; | |
1433 | ||
1434 | if (!device->usec_initialized) | |
1435 | return -ENODATA; | |
1436 | ||
1437 | now_ts = now(clock_boottime_or_monotonic()); | |
1438 | ||
1439 | if (now_ts < device->usec_initialized) | |
1440 | return -EIO; | |
1441 | ||
1442 | *usec = now_ts - device->usec_initialized; | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1448 | void *v; |
1449 | ||
57fa1d09 TG |
1450 | assert_return(device, NULL); |
1451 | ||
1452 | (void) device_read_db(device); | |
1453 | ||
1454 | device->tags_iterator_generation = device->tags_generation; | |
1455 | device->tags_iterator = ITERATOR_FIRST; | |
1456 | ||
bccfe92e | 1457 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1458 | return v; |
57fa1d09 TG |
1459 | } |
1460 | ||
1461 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1462 | void *v; |
1463 | ||
57fa1d09 TG |
1464 | assert_return(device, NULL); |
1465 | ||
1466 | (void) device_read_db(device); | |
1467 | ||
1468 | if (device->tags_iterator_generation != device->tags_generation) | |
1469 | return NULL; | |
1470 | ||
bccfe92e | 1471 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1472 | return v; |
57fa1d09 TG |
1473 | } |
1474 | ||
1475 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1476 | void *v; |
1477 | ||
57fa1d09 TG |
1478 | assert_return(device, NULL); |
1479 | ||
1480 | (void) device_read_db(device); | |
1481 | ||
1482 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1483 | device->devlinks_iterator = ITERATOR_FIRST; | |
1484 | ||
bccfe92e | 1485 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1486 | return v; |
57fa1d09 TG |
1487 | } |
1488 | ||
1489 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1490 | void *v; |
1491 | ||
57fa1d09 TG |
1492 | assert_return(device, NULL); |
1493 | ||
1494 | (void) device_read_db(device); | |
1495 | ||
1496 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1497 | return NULL; | |
1498 | ||
bccfe92e | 1499 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1500 | return v; |
57fa1d09 TG |
1501 | } |
1502 | ||
1503 | static int device_properties_prepare(sd_device *device) { | |
1504 | int r; | |
1505 | ||
1506 | assert(device); | |
1507 | ||
1508 | r = device_read_uevent_file(device); | |
1509 | if (r < 0) | |
1510 | return r; | |
1511 | ||
1512 | r = device_read_db(device); | |
1513 | if (r < 0) | |
1514 | return r; | |
1515 | ||
1516 | if (device->property_devlinks_outdated) { | |
1d88a271 MP |
1517 | _cleanup_free_ char *devlinks = NULL; |
1518 | size_t devlinks_allocated = 0, devlinks_len = 0; | |
57fa1d09 TG |
1519 | const char *devlink; |
1520 | ||
1d88a271 MP |
1521 | for (devlink = sd_device_get_devlink_first(device); devlink; devlink = sd_device_get_devlink_next(device)) { |
1522 | char *e; | |
57fa1d09 | 1523 | |
1d88a271 MP |
1524 | if (!GREEDY_REALLOC(devlinks, devlinks_allocated, devlinks_len + strlen(devlink) + 2)) |
1525 | return -ENOMEM; | |
1526 | if (devlinks_len > 0) | |
1527 | stpcpy(devlinks + devlinks_len++, " "); | |
1528 | e = stpcpy(devlinks + devlinks_len, devlink); | |
1529 | devlinks_len = e - devlinks; | |
1530 | } | |
57fa1d09 TG |
1531 | |
1532 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1533 | if (r < 0) | |
1534 | return r; | |
1535 | ||
1536 | device->property_devlinks_outdated = false; | |
1537 | } | |
1538 | ||
1539 | if (device->property_tags_outdated) { | |
1d88a271 MP |
1540 | _cleanup_free_ char *tags = NULL; |
1541 | size_t tags_allocated = 0, tags_len = 0; | |
57fa1d09 TG |
1542 | const char *tag; |
1543 | ||
1d88a271 MP |
1544 | if (!GREEDY_REALLOC(tags, tags_allocated, 2)) |
1545 | return -ENOMEM; | |
1546 | stpcpy(tags, ":"); | |
1547 | tags_len++; | |
57fa1d09 | 1548 | |
1d88a271 MP |
1549 | for (tag = sd_device_get_tag_first(device); tag; tag = sd_device_get_tag_next(device)) { |
1550 | char *e; | |
57fa1d09 | 1551 | |
817ec8cc | 1552 | if (!GREEDY_REALLOC(tags, tags_allocated, tags_len + strlen(tag) + 2)) |
1d88a271 MP |
1553 | return -ENOMEM; |
1554 | e = stpcpy(stpcpy(tags + tags_len, tag), ":"); | |
1555 | tags_len = e - tags; | |
1556 | } | |
57fa1d09 TG |
1557 | |
1558 | r = device_add_property_internal(device, "TAGS", tags); | |
1559 | if (r < 0) | |
1560 | return r; | |
1561 | ||
1562 | device->property_tags_outdated = false; | |
1563 | } | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
1569 | const char *key; | |
1570 | const char *value; | |
1571 | int r; | |
1572 | ||
1573 | assert_return(device, NULL); | |
1574 | ||
1575 | r = device_properties_prepare(device); | |
1576 | if (r < 0) | |
1577 | return NULL; | |
1578 | ||
1579 | device->properties_iterator_generation = device->properties_generation; | |
1580 | device->properties_iterator = ITERATOR_FIRST; | |
1581 | ||
8927b1da | 1582 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1583 | |
1584 | if (_value) | |
1585 | *_value = value; | |
1586 | ||
1587 | return key; | |
1588 | } | |
1589 | ||
1590 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
1591 | const char *key; | |
1592 | const char *value; | |
1593 | int r; | |
1594 | ||
1595 | assert_return(device, NULL); | |
1596 | ||
1597 | r = device_properties_prepare(device); | |
1598 | if (r < 0) | |
1599 | return NULL; | |
1600 | ||
1601 | if (device->properties_iterator_generation != device->properties_generation) | |
1602 | return NULL; | |
1603 | ||
8927b1da | 1604 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1605 | |
1606 | if (_value) | |
1607 | *_value = value; | |
1608 | ||
1609 | return key; | |
1610 | } | |
1611 | ||
1612 | static int device_sysattrs_read_all(sd_device *device) { | |
1613 | _cleanup_closedir_ DIR *dir = NULL; | |
1614 | const char *syspath; | |
1615 | struct dirent *dent; | |
1616 | int r; | |
1617 | ||
1618 | assert(device); | |
1619 | ||
1620 | if (device->sysattrs_read) | |
1621 | return 0; | |
1622 | ||
1623 | r = sd_device_get_syspath(device, &syspath); | |
1624 | if (r < 0) | |
1625 | return r; | |
1626 | ||
1627 | dir = opendir(syspath); | |
1628 | if (!dir) | |
1629 | return -errno; | |
1630 | ||
1631 | r = set_ensure_allocated(&device->sysattrs, &string_hash_ops); | |
1632 | if (r < 0) | |
1633 | return r; | |
1634 | ||
8fb3f009 | 1635 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
57fa1d09 TG |
1636 | char *path; |
1637 | struct stat statbuf; | |
1638 | ||
1639 | /* only handle symlinks and regular files */ | |
945c2931 | 1640 | if (!IN_SET(dent->d_type, DT_LNK, DT_REG)) |
57fa1d09 TG |
1641 | continue; |
1642 | ||
1643 | path = strjoina(syspath, "/", dent->d_name); | |
1644 | ||
1645 | if (lstat(path, &statbuf) != 0) | |
1646 | continue; | |
1647 | ||
1648 | if (!(statbuf.st_mode & S_IRUSR)) | |
1649 | continue; | |
1650 | ||
1651 | r = set_put_strdup(device->sysattrs, dent->d_name); | |
1652 | if (r < 0) | |
1653 | return r; | |
1654 | } | |
1655 | ||
1656 | device->sysattrs_read = true; | |
1657 | ||
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 1662 | void *v; |
57fa1d09 TG |
1663 | int r; |
1664 | ||
1665 | assert_return(device, NULL); | |
1666 | ||
1667 | if (!device->sysattrs_read) { | |
1668 | r = device_sysattrs_read_all(device); | |
1669 | if (r < 0) { | |
1670 | errno = -r; | |
1671 | return NULL; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | device->sysattrs_iterator = ITERATOR_FIRST; | |
1676 | ||
bccfe92e | 1677 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1678 | return v; |
57fa1d09 TG |
1679 | } |
1680 | ||
1681 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
1682 | void *v; |
1683 | ||
57fa1d09 TG |
1684 | assert_return(device, NULL); |
1685 | ||
1686 | if (!device->sysattrs_read) | |
1687 | return NULL; | |
1688 | ||
bccfe92e | 1689 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1690 | return v; |
57fa1d09 TG |
1691 | } |
1692 | ||
1693 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
1694 | assert_return(device, -EINVAL); | |
1695 | assert_return(tag, -EINVAL); | |
1696 | ||
1697 | (void) device_read_db(device); | |
1698 | ||
1699 | return !!set_contains(device->tags, tag); | |
1700 | } | |
1701 | ||
1702 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) { | |
1703 | char *value; | |
1704 | int r; | |
1705 | ||
1706 | assert_return(device, -EINVAL); | |
1707 | assert_return(key, -EINVAL); | |
1708 | assert_return(_value, -EINVAL); | |
1709 | ||
1710 | r = device_properties_prepare(device); | |
1711 | if (r < 0) | |
1712 | return r; | |
1713 | ||
1714 | value = ordered_hashmap_get(device->properties, key); | |
1715 | if (!value) | |
1716 | return -ENOENT; | |
1717 | ||
1718 | *_value = value; | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | /* replaces the value if it already exists */ | |
2fe29a46 | 1724 | static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) { |
57fa1d09 | 1725 | _cleanup_free_ char *key = NULL; |
2fe29a46 | 1726 | _cleanup_free_ char *value_old = NULL; |
57fa1d09 TG |
1727 | int r; |
1728 | ||
1729 | assert(device); | |
1730 | assert(_key); | |
1731 | ||
1732 | r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops); | |
1733 | if (r < 0) | |
1734 | return r; | |
1735 | ||
2fe29a46 | 1736 | value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key); |
57fa1d09 TG |
1737 | if (!key) { |
1738 | key = strdup(_key); | |
1739 | if (!key) | |
1740 | return -ENOMEM; | |
1741 | } | |
1742 | ||
57fa1d09 TG |
1743 | r = hashmap_put(device->sysattr_values, key, value); |
1744 | if (r < 0) | |
1745 | return r; | |
1746 | ||
1747 | key = NULL; | |
57fa1d09 TG |
1748 | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) { | |
1753 | const char *key = NULL, *value; | |
1754 | ||
1755 | assert(device); | |
1756 | assert(_key); | |
1757 | ||
1758 | value = hashmap_get2(device->sysattr_values, _key, (void **) &key); | |
1759 | if (!key) | |
1760 | return -ENOENT; | |
1761 | ||
1762 | if (_value) | |
1763 | *_value = value; | |
1764 | ||
1765 | return 0; | |
1766 | } | |
1767 | ||
1768 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
1769 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
1770 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) { | |
1771 | _cleanup_free_ char *value = NULL; | |
1772 | const char *syspath, *cached_value = NULL; | |
1773 | char *path; | |
1774 | struct stat statbuf; | |
1775 | int r; | |
1776 | ||
1777 | assert_return(device, -EINVAL); | |
1778 | assert_return(sysattr, -EINVAL); | |
1779 | ||
1780 | /* look for possibly already cached result */ | |
1781 | r = device_get_sysattr_value(device, sysattr, &cached_value); | |
1782 | if (r != -ENOENT) { | |
1783 | if (r < 0) | |
1784 | return r; | |
1785 | ||
1786 | if (!cached_value) | |
1787 | /* we looked up the sysattr before and it did not exist */ | |
1788 | return -ENOENT; | |
1789 | ||
1790 | if (_value) | |
1791 | *_value = cached_value; | |
1792 | ||
1793 | return 0; | |
1794 | } | |
1795 | ||
1796 | r = sd_device_get_syspath(device, &syspath); | |
1797 | if (r < 0) | |
1798 | return r; | |
1799 | ||
1800 | path = strjoina(syspath, "/", sysattr); | |
1801 | r = lstat(path, &statbuf); | |
1802 | if (r < 0) { | |
1803 | /* remember that we could not access the sysattr */ | |
1804 | r = device_add_sysattr_value(device, sysattr, NULL); | |
1805 | if (r < 0) | |
1806 | return r; | |
1807 | ||
1808 | return -ENOENT; | |
1809 | } else if (S_ISLNK(statbuf.st_mode)) { | |
1810 | /* Some core links return only the last element of the target path, | |
1811 | * these are just values, the paths should not be exposed. */ | |
1812 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
1813 | r = readlink_value(path, &value); | |
1814 | if (r < 0) | |
1815 | return r; | |
1816 | } else | |
1817 | return -EINVAL; | |
1818 | } else if (S_ISDIR(statbuf.st_mode)) { | |
1819 | /* skip directories */ | |
1820 | return -EINVAL; | |
1821 | } else if (!(statbuf.st_mode & S_IRUSR)) { | |
1822 | /* skip non-readable files */ | |
1823 | return -EPERM; | |
1824 | } else { | |
1825 | size_t size; | |
1826 | ||
1827 | /* read attribute value */ | |
1828 | r = read_full_file(path, &value, &size); | |
1829 | if (r < 0) | |
1830 | return r; | |
1831 | ||
1832 | /* drop trailing newlines */ | |
1833 | while (size > 0 && value[--size] == '\n') | |
1834 | value[size] = '\0'; | |
1835 | } | |
1836 | ||
1837 | r = device_add_sysattr_value(device, sysattr, value); | |
1838 | if (r < 0) | |
1839 | return r; | |
1840 | ||
1841 | *_value = value; | |
1842 | value = NULL; | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | static void device_remove_sysattr_value(sd_device *device, const char *_key) { | |
1848 | _cleanup_free_ char *key = NULL; | |
1849 | _cleanup_free_ char *value = NULL; | |
1850 | ||
1851 | assert(device); | |
1852 | assert(_key); | |
1853 | ||
1854 | value = hashmap_remove2(device->sysattr_values, _key, (void **) &key); | |
1855 | ||
1856 | return; | |
1857 | } | |
1858 | ||
1859 | /* set the attribute and save it in the cache. If a NULL value is passed the | |
1860 | * attribute is cleared from the cache */ | |
2fe29a46 | 1861 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, char *_value) { |
57fa1d09 | 1862 | _cleanup_close_ int fd = -1; |
2fe29a46 | 1863 | _cleanup_free_ char *value = NULL; |
57fa1d09 TG |
1864 | const char *syspath; |
1865 | char *path; | |
2fa4861a | 1866 | size_t len = 0; |
57fa1d09 TG |
1867 | ssize_t size; |
1868 | int r; | |
1869 | ||
1870 | assert_return(device, -EINVAL); | |
1871 | assert_return(sysattr, -EINVAL); | |
1872 | ||
2fe29a46 | 1873 | if (!_value) { |
57fa1d09 TG |
1874 | device_remove_sysattr_value(device, sysattr); |
1875 | ||
1876 | return 0; | |
1877 | } | |
1878 | ||
1879 | r = sd_device_get_syspath(device, &syspath); | |
1880 | if (r < 0) | |
1881 | return r; | |
1882 | ||
1883 | path = strjoina(syspath, "/", sysattr); | |
2fa4861a ZJS |
1884 | |
1885 | fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); | |
1886 | if (fd < 0) { | |
1887 | if (errno == ELOOP) | |
1888 | return -EINVAL; | |
1889 | if (errno == EISDIR) | |
1890 | return -EISDIR; | |
1891 | ||
2fe29a46 TG |
1892 | value = strdup(""); |
1893 | if (!value) | |
1894 | return -ENOMEM; | |
1895 | ||
1896 | r = device_add_sysattr_value(device, sysattr, value); | |
57fa1d09 TG |
1897 | if (r < 0) |
1898 | return r; | |
3bd82598 | 1899 | value = NULL; |
57fa1d09 TG |
1900 | |
1901 | return -ENXIO; | |
1902 | } | |
1903 | ||
2fa4861a | 1904 | len = strlen(_value); |
57fa1d09 TG |
1905 | |
1906 | /* drop trailing newlines */ | |
2fa4861a ZJS |
1907 | while (len > 0 && _value[len - 1] == '\n') |
1908 | len --; | |
57fa1d09 TG |
1909 | |
1910 | /* value length is limited to 4k */ | |
2fa4861a | 1911 | if (len > 4096) |
57fa1d09 TG |
1912 | return -EINVAL; |
1913 | ||
2fa4861a | 1914 | value = strndup(_value, len); |
2fe29a46 TG |
1915 | if (!value) |
1916 | return -ENOMEM; | |
1917 | ||
2fa4861a | 1918 | size = write(fd, value, len); |
57fa1d09 TG |
1919 | if (size < 0) |
1920 | return -errno; | |
1921 | ||
2fa4861a | 1922 | if ((size_t)size != len) |
57fa1d09 TG |
1923 | return -EIO; |
1924 | ||
1925 | r = device_add_sysattr_value(device, sysattr, value); | |
1926 | if (r < 0) | |
1927 | return r; | |
2fe29a46 TG |
1928 | value = NULL; |
1929 | ||
57fa1d09 TG |
1930 | return 0; |
1931 | } |