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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) { | |
5bbe8eab | 169 | r = chase_symlinks(_syspath, NULL, 0, &syspath); |
08232a02 TG |
170 | if (r == -ENOENT) |
171 | /* the device does not exist (any more?) */ | |
172 | return -ENODEV; | |
5bbe8eab | 173 | else if (r < 0) { |
23446f01 | 174 | log_debug_errno(r, "sd-device: could not get target of '%s': %m", _syspath); |
57fa1d09 TG |
175 | return r; |
176 | } | |
177 | ||
2e1ec12e YW |
178 | if (!path_startswith(syspath, "/sys")) { |
179 | _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL; | |
180 | char *p; | |
181 | ||
182 | /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */ | |
183 | r = chase_symlinks("/sys", NULL, 0, &real_sys); | |
184 | if (r < 0) | |
185 | return log_debug_errno(r, "sd-device: could not chase symlink /sys: %m"); | |
186 | ||
187 | p = path_startswith(syspath, real_sys); | |
188 | if (!p) { | |
189 | log_debug("sd-device: canonicalized path '%s' does not starts with sysfs mount point '%s'", syspath, real_sys); | |
190 | return -ENODEV; | |
191 | } | |
192 | ||
193 | new_syspath = strjoin("/sys/", p); | |
194 | if (!new_syspath) | |
195 | return log_oom(); | |
196 | ||
197 | free_and_replace(syspath, new_syspath); | |
198 | path_kill_slashes(syspath); | |
199 | } | |
200 | ||
57fa1d09 TG |
201 | if (path_startswith(syspath, "/sys/devices/")) { |
202 | char *path; | |
203 | ||
204 | /* all 'devices' require an 'uevent' file */ | |
205 | path = strjoina(syspath, "/uevent"); | |
206 | r = access(path, F_OK); | |
207 | if (r < 0) { | |
52d62901 TG |
208 | if (errno == ENOENT) |
209 | /* this is not a valid device */ | |
210 | return -ENODEV; | |
211 | ||
25f027c5 | 212 | return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath); |
57fa1d09 TG |
213 | } |
214 | } else { | |
61233823 | 215 | /* everything else just needs to be a directory */ |
52d62901 TG |
216 | if (!is_dir(syspath, false)) |
217 | return -ENODEV; | |
57fa1d09 TG |
218 | } |
219 | } else { | |
220 | syspath = strdup(_syspath); | |
221 | if (!syspath) | |
222 | return -ENOMEM; | |
223 | } | |
224 | ||
fbd0b64f | 225 | devpath = syspath + STRLEN("/sys"); |
57fa1d09 TG |
226 | |
227 | r = device_add_property_internal(device, "DEVPATH", devpath); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
f9ecfd3b | 231 | free_and_replace(device->syspath, syspath); |
57fa1d09 TG |
232 | |
233 | device->devpath = devpath; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { | |
4afd3348 | 239 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
240 | int r; |
241 | ||
242 | assert_return(ret, -EINVAL); | |
243 | assert_return(syspath, -EINVAL); | |
244 | ||
245 | r = device_new_aux(&device); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
249 | r = device_set_syspath(device, syspath, true); | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | *ret = device; | |
254 | device = NULL; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
260 | char *syspath; | |
261 | char id[DECIMAL_STR_MAX(unsigned) * 2 + 1]; | |
262 | ||
263 | assert_return(ret, -EINVAL); | |
945c2931 | 264 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); |
57fa1d09 TG |
265 | |
266 | /* use /sys/dev/{block,char}/<maj>:<min> link */ | |
267 | snprintf(id, sizeof(id), "%u:%u", major(devnum), minor(devnum)); | |
268 | ||
269 | syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id); | |
270 | ||
271 | return sd_device_new_from_syspath(ret, syspath); | |
272 | } | |
273 | ||
274 | _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) { | |
21d6220f TG |
275 | char *name, *syspath; |
276 | size_t len = 0; | |
57fa1d09 TG |
277 | |
278 | assert_return(ret, -EINVAL); | |
279 | assert_return(subsystem, -EINVAL); | |
280 | assert_return(sysname, -EINVAL); | |
281 | ||
282 | if (streq(subsystem, "subsystem")) { | |
283 | syspath = strjoina("/sys/subsystem/", sysname); | |
284 | if (access(syspath, F_OK) >= 0) | |
285 | return sd_device_new_from_syspath(ret, syspath); | |
286 | ||
287 | syspath = strjoina("/sys/bus/", sysname); | |
288 | if (access(syspath, F_OK) >= 0) | |
289 | return sd_device_new_from_syspath(ret, syspath); | |
290 | ||
291 | syspath = strjoina("/sys/class/", sysname); | |
292 | if (access(syspath, F_OK) >= 0) | |
293 | return sd_device_new_from_syspath(ret, syspath); | |
294 | } else if (streq(subsystem, "module")) { | |
295 | syspath = strjoina("/sys/module/", sysname); | |
296 | if (access(syspath, F_OK) >= 0) | |
297 | return sd_device_new_from_syspath(ret, syspath); | |
298 | } else if (streq(subsystem, "drivers")) { | |
299 | char subsys[PATH_MAX]; | |
300 | char *driver; | |
301 | ||
302 | strscpy(subsys, sizeof(subsys), sysname); | |
303 | driver = strchr(subsys, ':'); | |
304 | if (driver) { | |
305 | driver[0] = '\0'; | |
306 | driver++; | |
307 | ||
308 | syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver); | |
309 | if (access(syspath, F_OK) >= 0) | |
310 | return sd_device_new_from_syspath(ret, syspath); | |
311 | ||
312 | syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver); | |
313 | if (access(syspath, F_OK) >= 0) | |
314 | return sd_device_new_from_syspath(ret, syspath); | |
21d6220f TG |
315 | } |
316 | } | |
a9ec9f29 | 317 | |
21d6220f TG |
318 | /* translate sysname back to sysfs filename */ |
319 | name = strdupa(sysname); | |
320 | while (name[len] != '\0') { | |
321 | if (name[len] == '/') | |
322 | name[len] = '!'; | |
a9ec9f29 | 323 | |
21d6220f TG |
324 | len++; |
325 | } | |
a9ec9f29 | 326 | |
21d6220f TG |
327 | syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name); |
328 | if (access(syspath, F_OK) >= 0) | |
329 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 330 | |
21d6220f TG |
331 | syspath = strjoina("/sys/bus/", subsystem, "/devices/", name); |
332 | if (access(syspath, F_OK) >= 0) | |
333 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 334 | |
21d6220f TG |
335 | syspath = strjoina("/sys/class/", subsystem, "/", name); |
336 | if (access(syspath, F_OK) >= 0) | |
337 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 338 | |
a918b673 PK |
339 | syspath = strjoina("/sys/firmware/", subsystem, "/", sysname); |
340 | if (access(syspath, F_OK) >= 0) | |
341 | return sd_device_new_from_syspath(ret, syspath); | |
342 | ||
08232a02 | 343 | return -ENODEV; |
57fa1d09 TG |
344 | } |
345 | ||
346 | int device_set_devtype(sd_device *device, const char *_devtype) { | |
347 | _cleanup_free_ char *devtype = NULL; | |
348 | int r; | |
349 | ||
350 | assert(device); | |
351 | assert(_devtype); | |
352 | ||
353 | devtype = strdup(_devtype); | |
354 | if (!devtype) | |
355 | return -ENOMEM; | |
356 | ||
357 | r = device_add_property_internal(device, "DEVTYPE", devtype); | |
358 | if (r < 0) | |
359 | return r; | |
360 | ||
f9ecfd3b | 361 | free_and_replace(device->devtype, devtype); |
57fa1d09 TG |
362 | |
363 | return 0; | |
364 | } | |
365 | ||
366 | int device_set_ifindex(sd_device *device, const char *_ifindex) { | |
367 | int ifindex, r; | |
368 | ||
369 | assert(device); | |
370 | assert(_ifindex); | |
371 | ||
6ad623a3 | 372 | r = parse_ifindex(_ifindex, &ifindex); |
57fa1d09 TG |
373 | if (r < 0) |
374 | return r; | |
375 | ||
57fa1d09 TG |
376 | r = device_add_property_internal(device, "IFINDEX", _ifindex); |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
380 | device->ifindex = ifindex; | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | int device_set_devname(sd_device *device, const char *_devname) { | |
386 | _cleanup_free_ char *devname = NULL; | |
387 | int r; | |
388 | ||
389 | assert(device); | |
390 | assert(_devname); | |
391 | ||
392 | if (_devname[0] != '/') { | |
393 | r = asprintf(&devname, "/dev/%s", _devname); | |
394 | if (r < 0) | |
395 | return -ENOMEM; | |
396 | } else { | |
397 | devname = strdup(_devname); | |
398 | if (!devname) | |
399 | return -ENOMEM; | |
400 | } | |
401 | ||
402 | r = device_add_property_internal(device, "DEVNAME", devname); | |
403 | if (r < 0) | |
404 | return r; | |
405 | ||
f9ecfd3b | 406 | free_and_replace(device->devname, devname); |
57fa1d09 TG |
407 | |
408 | return 0; | |
409 | } | |
410 | ||
411 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
412 | unsigned devmode; | |
413 | int r; | |
414 | ||
415 | assert(device); | |
416 | assert(_devmode); | |
417 | ||
418 | r = safe_atou(_devmode, &devmode); | |
419 | if (r < 0) | |
420 | return r; | |
421 | ||
422 | if (devmode > 07777) | |
423 | return -EINVAL; | |
424 | ||
425 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
426 | if (r < 0) | |
427 | return r; | |
428 | ||
429 | device->devmode = devmode; | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
435 | unsigned maj = 0, min = 0; | |
436 | int r; | |
437 | ||
438 | assert(device); | |
439 | assert(major); | |
440 | ||
441 | r = safe_atou(major, &maj); | |
442 | if (r < 0) | |
443 | return r; | |
444 | if (!maj) | |
445 | return 0; | |
446 | ||
447 | if (minor) { | |
448 | r = safe_atou(minor, &min); | |
449 | if (r < 0) | |
450 | return r; | |
451 | } | |
452 | ||
453 | r = device_add_property_internal(device, "MAJOR", major); | |
454 | if (r < 0) | |
455 | return r; | |
456 | ||
457 | if (minor) { | |
458 | r = device_add_property_internal(device, "MINOR", minor); | |
459 | if (r < 0) | |
460 | return r; | |
461 | } | |
462 | ||
463 | device->devnum = makedev(maj, min); | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) { | |
469 | int r; | |
470 | ||
471 | assert(device); | |
472 | assert(key); | |
473 | assert(value); | |
474 | assert(major); | |
475 | assert(minor); | |
476 | ||
477 | if (streq(key, "DEVTYPE")) { | |
478 | r = device_set_devtype(device, value); | |
479 | if (r < 0) | |
480 | return r; | |
481 | } else if (streq(key, "IFINDEX")) { | |
482 | r = device_set_ifindex(device, value); | |
483 | if (r < 0) | |
484 | return r; | |
485 | } else if (streq(key, "DEVNAME")) { | |
486 | r = device_set_devname(device, value); | |
487 | if (r < 0) | |
488 | return r; | |
489 | } else if (streq(key, "DEVMODE")) { | |
490 | r = device_set_devmode(device, value); | |
491 | if (r < 0) | |
492 | return r; | |
493 | } else if (streq(key, "MAJOR")) | |
494 | *major = value; | |
495 | else if (streq(key, "MINOR")) | |
496 | *minor = value; | |
497 | else { | |
498 | r = device_add_property_internal(device, key, value); | |
499 | if (r < 0) | |
500 | return r; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | int device_read_uevent_file(sd_device *device) { | |
507 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 508 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
509 | char *path; |
510 | size_t uevent_len; | |
511 | unsigned i; | |
512 | int r; | |
513 | ||
514 | enum { | |
515 | PRE_KEY, | |
516 | KEY, | |
517 | PRE_VALUE, | |
518 | VALUE, | |
519 | INVALID_LINE, | |
520 | } state = PRE_KEY; | |
521 | ||
522 | assert(device); | |
523 | ||
524 | if (device->uevent_loaded || device->sealed) | |
525 | return 0; | |
526 | ||
7141e4f6 TG |
527 | device->uevent_loaded = true; |
528 | ||
57fa1d09 TG |
529 | r = sd_device_get_syspath(device, &syspath); |
530 | if (r < 0) | |
531 | return r; | |
532 | ||
533 | path = strjoina(syspath, "/uevent"); | |
534 | ||
535 | r = read_full_file(path, &uevent, &uevent_len); | |
bba06166 TG |
536 | if (r == -EACCES) |
537 | /* empty uevent files may be write-only */ | |
538 | return 0; | |
2a213740 TG |
539 | else if (r == -ENOENT) |
540 | /* some devices may not have uevent files, see set_syspath() */ | |
541 | return 0; | |
bba06166 | 542 | else if (r < 0) { |
e53fc357 | 543 | log_debug_errno(r, "sd-device: failed to read uevent file '%s': %m", path); |
57fa1d09 TG |
544 | return r; |
545 | } | |
546 | ||
755700bb | 547 | for (i = 0; i < uevent_len; i++) |
57fa1d09 TG |
548 | switch (state) { |
549 | case PRE_KEY: | |
550 | if (!strchr(NEWLINE, uevent[i])) { | |
551 | key = &uevent[i]; | |
552 | ||
553 | state = KEY; | |
554 | } | |
555 | ||
556 | break; | |
557 | case KEY: | |
558 | if (uevent[i] == '=') { | |
559 | uevent[i] = '\0'; | |
560 | ||
561 | state = PRE_VALUE; | |
562 | } else if (strchr(NEWLINE, uevent[i])) { | |
563 | uevent[i] = '\0'; | |
564 | log_debug("sd-device: ignoring invalid uevent line '%s'", key); | |
565 | ||
566 | state = PRE_KEY; | |
567 | } | |
568 | ||
569 | break; | |
570 | case PRE_VALUE: | |
571 | value = &uevent[i]; | |
57fa1d09 TG |
572 | state = VALUE; |
573 | ||
4831981d | 574 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
575 | case VALUE: |
576 | if (strchr(NEWLINE, uevent[i])) { | |
577 | uevent[i] = '\0'; | |
578 | ||
579 | r = handle_uevent_line(device, key, value, &major, &minor); | |
580 | if (r < 0) | |
19c29853 | 581 | log_debug_errno(r, "sd-device: failed to handle uevent entry '%s=%s': %m", key, value); |
57fa1d09 TG |
582 | |
583 | state = PRE_KEY; | |
584 | } | |
585 | ||
586 | break; | |
587 | default: | |
588 | assert_not_reached("invalid state when parsing uevent file"); | |
589 | } | |
57fa1d09 TG |
590 | |
591 | if (major) { | |
592 | r = device_set_devnum(device, major, minor); | |
593 | if (r < 0) | |
23446f01 | 594 | log_debug_errno(r, "sd-device: could not set 'MAJOR=%s' or 'MINOR=%s' from '%s': %m", major, minor, path); |
57fa1d09 TG |
595 | } |
596 | ||
57fa1d09 TG |
597 | return 0; |
598 | } | |
599 | ||
600 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
601 | int r; | |
602 | ||
603 | assert_return(device, -EINVAL); | |
604 | assert_return(ifindex, -EINVAL); | |
605 | ||
606 | r = device_read_uevent_file(device); | |
607 | if (r < 0) | |
608 | return r; | |
609 | ||
610 | *ifindex = device->ifindex; | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
616 | int r; | |
617 | ||
618 | assert_return(ret, -EINVAL); | |
619 | assert_return(id, -EINVAL); | |
620 | ||
621 | switch (id[0]) { | |
622 | case 'b': | |
623 | case 'c': | |
624 | { | |
625 | char type; | |
626 | int maj, min; | |
627 | ||
628 | r = sscanf(id, "%c%i:%i", &type, &maj, &min); | |
629 | if (r != 3) | |
630 | return -EINVAL; | |
631 | ||
632 | return sd_device_new_from_devnum(ret, type, makedev(maj, min)); | |
633 | } | |
634 | case 'n': | |
635 | { | |
4afd3348 | 636 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
637 | _cleanup_close_ int sk = -1; |
638 | struct ifreq ifr = {}; | |
639 | int ifindex; | |
640 | ||
6ad623a3 | 641 | r = parse_ifindex(&id[1], &ifr.ifr_ifindex); |
57fa1d09 TG |
642 | if (r < 0) |
643 | return r; | |
57fa1d09 | 644 | |
429b4350 | 645 | sk = socket_ioctl_fd(); |
57fa1d09 | 646 | if (sk < 0) |
429b4350 | 647 | return sk; |
57fa1d09 TG |
648 | |
649 | r = ioctl(sk, SIOCGIFNAME, &ifr); | |
650 | if (r < 0) | |
651 | return -errno; | |
652 | ||
653 | r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | r = sd_device_get_ifindex(device, &ifindex); | |
658 | if (r < 0) | |
659 | return r; | |
660 | ||
08232a02 | 661 | /* this is racey, so we might end up with the wrong device */ |
57fa1d09 TG |
662 | if (ifr.ifr_ifindex != ifindex) |
663 | return -ENODEV; | |
664 | ||
665 | *ret = device; | |
666 | device = NULL; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | case '+': | |
671 | { | |
672 | char subsys[PATH_MAX]; | |
673 | char *sysname; | |
674 | ||
675 | (void)strscpy(subsys, sizeof(subsys), id + 1); | |
676 | sysname = strchr(subsys, ':'); | |
677 | if (!sysname) | |
678 | return -EINVAL; | |
679 | ||
680 | sysname[0] = '\0'; | |
313cefa1 | 681 | sysname++; |
57fa1d09 TG |
682 | |
683 | return sd_device_new_from_subsystem_sysname(ret, subsys, sysname); | |
684 | } | |
685 | default: | |
686 | return -EINVAL; | |
687 | } | |
688 | } | |
689 | ||
690 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
691 | assert_return(device, -EINVAL); | |
692 | assert_return(ret, -EINVAL); | |
693 | ||
694 | assert(path_startswith(device->syspath, "/sys/")); | |
695 | ||
696 | *ret = device->syspath; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | static int device_new_from_child(sd_device **ret, sd_device *child) { | |
702 | _cleanup_free_ char *path = NULL; | |
703 | const char *subdir, *syspath; | |
704 | int r; | |
705 | ||
706 | assert(ret); | |
707 | assert(child); | |
708 | ||
709 | r = sd_device_get_syspath(child, &syspath); | |
710 | if (r < 0) | |
711 | return r; | |
712 | ||
713 | path = strdup(syspath); | |
714 | if (!path) | |
715 | return -ENOMEM; | |
fbd0b64f | 716 | subdir = path + STRLEN("/sys"); |
57fa1d09 TG |
717 | |
718 | for (;;) { | |
719 | char *pos; | |
720 | ||
721 | pos = strrchr(subdir, '/'); | |
722 | if (!pos || pos < subdir + 2) | |
723 | break; | |
724 | ||
725 | *pos = '\0'; | |
726 | ||
727 | r = sd_device_new_from_syspath(ret, path); | |
728 | if (r < 0) | |
729 | continue; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
08232a02 | 734 | return -ENODEV; |
57fa1d09 TG |
735 | } |
736 | ||
737 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
738 | ||
739 | assert_return(ret, -EINVAL); | |
740 | assert_return(child, -EINVAL); | |
741 | ||
742 | if (!child->parent_set) { | |
743 | child->parent_set = true; | |
744 | ||
745 | (void)device_new_from_child(&child->parent, child); | |
746 | } | |
747 | ||
748 | if (!child->parent) | |
749 | return -ENOENT; | |
750 | ||
751 | *ret = child->parent; | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
756 | int device_set_subsystem(sd_device *device, const char *_subsystem) { | |
757 | _cleanup_free_ char *subsystem = NULL; | |
758 | int r; | |
759 | ||
760 | assert(device); | |
761 | assert(_subsystem); | |
762 | ||
763 | subsystem = strdup(_subsystem); | |
764 | if (!subsystem) | |
765 | return -ENOMEM; | |
766 | ||
767 | r = device_add_property_internal(device, "SUBSYSTEM", subsystem); | |
768 | if (r < 0) | |
769 | return r; | |
770 | ||
f9ecfd3b | 771 | free_and_replace(device->subsystem, subsystem); |
57fa1d09 TG |
772 | |
773 | device->subsystem_set = true; | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
de7e983e TG |
778 | static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) { |
779 | _cleanup_free_ char *subsystem = NULL; | |
780 | int r; | |
781 | ||
782 | assert(device); | |
783 | assert(_subsystem); | |
784 | assert(*_subsystem); | |
785 | ||
786 | subsystem = strdup(_subsystem); | |
787 | if (!subsystem) | |
788 | return -ENOMEM; | |
789 | ||
790 | r = device_set_subsystem(device, "drivers"); | |
791 | if (r < 0) | |
792 | return r; | |
793 | ||
f9ecfd3b | 794 | free_and_replace(device->driver_subsystem, subsystem); |
de7e983e TG |
795 | |
796 | return 0; | |
797 | } | |
798 | ||
57fa1d09 | 799 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
800 | const char *syspath, *drivers = NULL; |
801 | int r; | |
802 | ||
57fa1d09 TG |
803 | assert_return(ret, -EINVAL); |
804 | assert_return(device, -EINVAL); | |
805 | ||
de7e983e TG |
806 | r = sd_device_get_syspath(device, &syspath); |
807 | if (r < 0) | |
808 | return r; | |
809 | ||
57fa1d09 TG |
810 | if (!device->subsystem_set) { |
811 | _cleanup_free_ char *subsystem = NULL; | |
57fa1d09 | 812 | char *path; |
57fa1d09 TG |
813 | |
814 | /* read 'subsystem' link */ | |
57fa1d09 TG |
815 | path = strjoina(syspath, "/subsystem"); |
816 | r = readlink_value(path, &subsystem); | |
817 | if (r >= 0) | |
818 | r = device_set_subsystem(device, subsystem); | |
819 | /* use implicit names */ | |
820 | else if (path_startswith(device->devpath, "/module/")) | |
821 | r = device_set_subsystem(device, "module"); | |
de7e983e TG |
822 | else if (!(drivers = strstr(syspath, "/drivers/")) && |
823 | (path_startswith(device->devpath, "/subsystem/") || | |
824 | path_startswith(device->devpath, "/class/") || | |
825 | path_startswith(device->devpath, "/bus/"))) | |
57fa1d09 | 826 | r = device_set_subsystem(device, "subsystem"); |
4189708a | 827 | if (r < 0 && r != -ENOENT) |
5a917c06 | 828 | return log_debug_errno(r, "sd-device: could not set subsystem for %s: %m", device->devpath); |
57fa1d09 TG |
829 | |
830 | device->subsystem_set = true; | |
de7e983e TG |
831 | } else if (!device->driver_subsystem_set) |
832 | drivers = strstr(syspath, "/drivers/"); | |
833 | ||
834 | if (!device->driver_subsystem_set) { | |
835 | if (drivers) { | |
836 | _cleanup_free_ char *subpath = NULL; | |
837 | ||
838 | subpath = strndup(syspath, drivers - syspath); | |
839 | if (!subpath) | |
840 | r = -ENOMEM; | |
841 | else { | |
842 | const char *subsys; | |
843 | ||
844 | subsys = strrchr(subpath, '/'); | |
845 | if (!subsys) | |
846 | r = -EINVAL; | |
847 | else | |
848 | r = device_set_drivers_subsystem(device, subsys + 1); | |
849 | } | |
850 | if (r < 0 && r != -ENOENT) | |
851 | return log_debug_errno(r, "sd-device: could not set subsystem for driver %s: %m", device->devpath); | |
852 | } | |
853 | ||
854 | device->driver_subsystem_set = true; | |
57fa1d09 TG |
855 | } |
856 | ||
bf4c113e DH |
857 | if (!device->subsystem) |
858 | return -ENOENT; | |
859 | ||
57fa1d09 TG |
860 | *ret = device->subsystem; |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
866 | int r; | |
867 | ||
868 | assert(devtype); | |
869 | assert(device); | |
870 | ||
871 | r = device_read_uevent_file(device); | |
872 | if (r < 0) | |
873 | return r; | |
874 | ||
875 | *devtype = device->devtype; | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
881 | sd_device *parent = NULL; | |
882 | int r; | |
883 | ||
884 | assert_return(child, -EINVAL); | |
885 | assert_return(subsystem, -EINVAL); | |
886 | ||
887 | r = sd_device_get_parent(child, &parent); | |
888 | while (r >= 0) { | |
889 | const char *parent_subsystem = NULL; | |
890 | const char *parent_devtype = NULL; | |
891 | ||
892 | (void)sd_device_get_subsystem(parent, &parent_subsystem); | |
893 | if (streq_ptr(parent_subsystem, subsystem)) { | |
894 | if (!devtype) | |
895 | break; | |
896 | ||
897 | (void)sd_device_get_devtype(parent, &parent_devtype); | |
898 | if (streq_ptr(parent_devtype, devtype)) | |
899 | break; | |
900 | } | |
901 | r = sd_device_get_parent(parent, &parent); | |
902 | } | |
903 | ||
904 | if (r < 0) | |
905 | return r; | |
906 | ||
907 | *ret = parent; | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
913 | int r; | |
914 | ||
915 | assert_return(device, -EINVAL); | |
916 | assert_return(devnum, -EINVAL); | |
917 | ||
918 | r = device_read_uevent_file(device); | |
919 | if (r < 0) | |
920 | return r; | |
921 | ||
922 | *devnum = device->devnum; | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | int device_set_driver(sd_device *device, const char *_driver) { | |
928 | _cleanup_free_ char *driver = NULL; | |
929 | int r; | |
930 | ||
931 | assert(device); | |
932 | assert(_driver); | |
933 | ||
934 | driver = strdup(_driver); | |
935 | if (!driver) | |
936 | return -ENOMEM; | |
937 | ||
938 | r = device_add_property_internal(device, "DRIVER", driver); | |
939 | if (r < 0) | |
940 | return r; | |
941 | ||
f9ecfd3b | 942 | free_and_replace(device->driver, driver); |
57fa1d09 TG |
943 | |
944 | device->driver_set = true; | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
950 | assert_return(device, -EINVAL); | |
951 | assert_return(ret, -EINVAL); | |
952 | ||
953 | if (!device->driver_set) { | |
954 | _cleanup_free_ char *driver = NULL; | |
955 | const char *syspath; | |
956 | char *path; | |
957 | int r; | |
958 | ||
959 | r = sd_device_get_syspath(device, &syspath); | |
960 | if (r < 0) | |
961 | return r; | |
962 | ||
963 | path = strjoina(syspath, "/driver"); | |
964 | r = readlink_value(path, &driver); | |
965 | if (r >= 0) { | |
966 | r = device_set_driver(device, driver); | |
967 | if (r < 0) | |
7283a80d TG |
968 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); |
969 | } else if (r == -ENOENT) | |
970 | device->driver_set = true; | |
971 | else | |
972 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); | |
57fa1d09 TG |
973 | } |
974 | ||
bf4c113e DH |
975 | if (!device->driver) |
976 | return -ENOENT; | |
977 | ||
57fa1d09 TG |
978 | *ret = device->driver; |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
983 | _public_ int sd_device_get_devpath(sd_device *device, const char **devpath) { | |
984 | assert_return(device, -EINVAL); | |
985 | assert_return(devpath, -EINVAL); | |
986 | ||
987 | assert(device->devpath); | |
988 | assert(device->devpath[0] == '/'); | |
989 | ||
990 | *devpath = device->devpath; | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
996 | int r; | |
997 | ||
998 | assert_return(device, -EINVAL); | |
999 | assert_return(devname, -EINVAL); | |
1000 | ||
1001 | r = device_read_uevent_file(device); | |
1002 | if (r < 0) | |
1003 | return r; | |
1004 | ||
1005 | if (!device->devname) | |
1006 | return -ENOENT; | |
1007 | ||
1008 | assert(path_startswith(device->devname, "/dev/")); | |
1009 | ||
1010 | *devname = device->devname; | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static int device_set_sysname(sd_device *device) { | |
1016 | _cleanup_free_ char *sysname = NULL; | |
afcac065 | 1017 | const char *sysnum = NULL; |
57fa1d09 TG |
1018 | const char *pos; |
1019 | size_t len = 0; | |
1020 | ||
1021 | pos = strrchr(device->devpath, '/'); | |
1022 | if (!pos) | |
1023 | return -EINVAL; | |
313cefa1 | 1024 | pos++; |
57fa1d09 TG |
1025 | |
1026 | /* devpath is not a root directory */ | |
1027 | if (*pos == '\0' || pos <= device->devpath) | |
1028 | return -EINVAL; | |
1029 | ||
1030 | sysname = strdup(pos); | |
1031 | if (!sysname) | |
1032 | return -ENOMEM; | |
1033 | ||
1034 | /* some devices have '!' in their name, change that to '/' */ | |
1035 | while (sysname[len] != '\0') { | |
1036 | if (sysname[len] == '!') | |
1037 | sysname[len] = '/'; | |
1038 | ||
313cefa1 | 1039 | len++; |
57fa1d09 TG |
1040 | } |
1041 | ||
1042 | /* trailing number */ | |
1043 | while (len > 0 && isdigit(sysname[--len])) | |
1044 | sysnum = &sysname[len]; | |
1045 | ||
1046 | if (len == 0) | |
1047 | sysnum = NULL; | |
1048 | ||
f9ecfd3b | 1049 | free_and_replace(device->sysname, sysname); |
57fa1d09 TG |
1050 | |
1051 | device->sysnum = sysnum; | |
1052 | ||
1053 | device->sysname_set = true; | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1059 | int r; | |
1060 | ||
1061 | assert_return(device, -EINVAL); | |
1062 | assert_return(ret, -EINVAL); | |
1063 | ||
1064 | if (!device->sysname_set) { | |
1065 | r = device_set_sysname(device); | |
1066 | if (r < 0) | |
1067 | return r; | |
1068 | } | |
1069 | ||
bf4c113e DH |
1070 | assert_return(device->sysname, -ENOENT); |
1071 | ||
57fa1d09 TG |
1072 | *ret = device->sysname; |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1078 | int r; | |
1079 | ||
1080 | assert_return(device, -EINVAL); | |
1081 | assert_return(ret, -EINVAL); | |
1082 | ||
1083 | if (!device->sysname_set) { | |
1084 | r = device_set_sysname(device); | |
1085 | if (r < 0) | |
1086 | return r; | |
1087 | } | |
1088 | ||
1089 | *ret = device->sysnum; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | static bool is_valid_tag(const char *tag) { | |
1095 | assert(tag); | |
1096 | ||
1097 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1098 | } | |
1099 | ||
1100 | int device_add_tag(sd_device *device, const char *tag) { | |
1101 | int r; | |
1102 | ||
1103 | assert(device); | |
1104 | assert(tag); | |
1105 | ||
1106 | if (!is_valid_tag(tag)) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | r = set_ensure_allocated(&device->tags, &string_hash_ops); | |
1110 | if (r < 0) | |
1111 | return r; | |
1112 | ||
1113 | r = set_put_strdup(device->tags, tag); | |
1114 | if (r < 0) | |
1115 | return r; | |
1116 | ||
313cefa1 | 1117 | device->tags_generation++; |
57fa1d09 TG |
1118 | device->property_tags_outdated = true; |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | int device_add_devlink(sd_device *device, const char *devlink) { | |
1124 | int r; | |
1125 | ||
1126 | assert(device); | |
1127 | assert(devlink); | |
1128 | ||
1129 | r = set_ensure_allocated(&device->devlinks, &string_hash_ops); | |
1130 | if (r < 0) | |
1131 | return r; | |
1132 | ||
1133 | r = set_put_strdup(device->devlinks, devlink); | |
1134 | if (r < 0) | |
1135 | return r; | |
1136 | ||
313cefa1 | 1137 | device->devlinks_generation++; |
57fa1d09 TG |
1138 | device->property_devlinks_outdated = true; |
1139 | ||
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { | |
1144 | _cleanup_free_ char *key = NULL; | |
1145 | char *value; | |
1146 | ||
1147 | assert(device); | |
1148 | assert(str); | |
1149 | ||
1150 | key = strdup(str); | |
1151 | if (!key) | |
1152 | return -ENOMEM; | |
1153 | ||
1154 | value = strchr(key, '='); | |
1155 | if (!value) | |
1156 | return -EINVAL; | |
1157 | ||
1158 | *value = '\0'; | |
1159 | ||
1160 | if (isempty(++value)) | |
1161 | value = NULL; | |
1162 | ||
1163 | return device_add_property_internal(device, key, value); | |
1164 | } | |
1165 | ||
1166 | int device_set_usec_initialized(sd_device *device, const char *initialized) { | |
1167 | uint64_t usec_initialized; | |
1168 | int r; | |
1169 | ||
1170 | assert(device); | |
1171 | assert(initialized); | |
1172 | ||
1173 | r = safe_atou64(initialized, &usec_initialized); | |
1174 | if (r < 0) | |
1175 | return r; | |
1176 | ||
1177 | r = device_add_property_internal(device, "USEC_INITIALIZED", initialized); | |
1178 | if (r < 0) | |
1179 | return r; | |
1180 | ||
1181 | device->usec_initialized = usec_initialized; | |
1182 | ||
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
1187 | char *path; | |
1188 | int r; | |
1189 | ||
1190 | assert(device); | |
1191 | assert(value); | |
1192 | ||
1193 | switch (key) { | |
1194 | case 'G': | |
1195 | r = device_add_tag(device, value); | |
1196 | if (r < 0) | |
1197 | return r; | |
1198 | ||
1199 | break; | |
1200 | case 'S': | |
1201 | path = strjoina("/dev/", value); | |
1202 | r = device_add_devlink(device, path); | |
1203 | if (r < 0) | |
1204 | return r; | |
1205 | ||
1206 | break; | |
1207 | case 'E': | |
1208 | r = device_add_property_internal_from_string(device, value); | |
1209 | if (r < 0) | |
1210 | return r; | |
1211 | ||
1212 | break; | |
1213 | case 'I': | |
1214 | r = device_set_usec_initialized(device, value); | |
1215 | if (r < 0) | |
1216 | return r; | |
1217 | ||
1218 | break; | |
1219 | case 'L': | |
1220 | r = safe_atoi(value, &device->devlink_priority); | |
1221 | if (r < 0) | |
1222 | return r; | |
1223 | ||
1224 | break; | |
1225 | case 'W': | |
1226 | r = safe_atoi(value, &device->watch_handle); | |
1227 | if (r < 0) | |
1228 | return r; | |
1229 | ||
1230 | break; | |
1231 | default: | |
1232 | log_debug("device db: unknown key '%c'", key); | |
1233 | } | |
1234 | ||
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | int device_get_id_filename(sd_device *device, const char **ret) { | |
1239 | assert(device); | |
1240 | assert(ret); | |
1241 | ||
1242 | if (!device->id_filename) { | |
1243 | _cleanup_free_ char *id = NULL; | |
1244 | const char *subsystem; | |
1245 | dev_t devnum; | |
1246 | int ifindex, r; | |
1247 | ||
1248 | r = sd_device_get_subsystem(device, &subsystem); | |
1249 | if (r < 0) | |
1250 | return r; | |
1251 | ||
1252 | r = sd_device_get_devnum(device, &devnum); | |
1253 | if (r < 0) | |
1254 | return r; | |
1255 | ||
1256 | r = sd_device_get_ifindex(device, &ifindex); | |
1257 | if (r < 0) | |
1258 | return r; | |
1259 | ||
1260 | if (major(devnum) > 0) { | |
4189708a TG |
1261 | assert(subsystem); |
1262 | ||
ccddd104 | 1263 | /* use dev_t — b259:131072, c254:0 */ |
57fa1d09 TG |
1264 | r = asprintf(&id, "%c%u:%u", |
1265 | streq(subsystem, "block") ? 'b' : 'c', | |
1266 | major(devnum), minor(devnum)); | |
1267 | if (r < 0) | |
53fae771 | 1268 | return -ENOMEM; |
57fa1d09 | 1269 | } else if (ifindex > 0) { |
ccddd104 | 1270 | /* use netdev ifindex — n3 */ |
57fa1d09 TG |
1271 | r = asprintf(&id, "n%u", ifindex); |
1272 | if (r < 0) | |
53fae771 | 1273 | return -ENOMEM; |
57fa1d09 | 1274 | } else { |
ccddd104 | 1275 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
57fa1d09 TG |
1276 | * sysname() has '!' translated, get it from devpath |
1277 | */ | |
1278 | const char *sysname; | |
1279 | ||
1280 | sysname = basename(device->devpath); | |
1281 | if (!sysname) | |
4189708a TG |
1282 | return -EINVAL; |
1283 | ||
1284 | if (!subsystem) | |
57fa1d09 TG |
1285 | return -EINVAL; |
1286 | ||
de7e983e TG |
1287 | if (streq(subsystem, "drivers")) { |
1288 | /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem | |
1289 | * encoded as well */ | |
1290 | r = asprintf(&id, "+drivers:%s:%s", device->driver_subsystem, sysname); | |
1291 | if (r < 0) | |
1292 | return -ENOMEM; | |
1293 | } else { | |
1294 | r = asprintf(&id, "+%s:%s", subsystem, sysname); | |
1295 | if (r < 0) | |
1296 | return -ENOMEM; | |
1297 | } | |
57fa1d09 TG |
1298 | } |
1299 | ||
1300 | device->id_filename = id; | |
1301 | id = NULL; | |
1302 | } | |
1303 | ||
1304 | *ret = device->id_filename; | |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
107f2e25 | 1309 | int device_read_db_aux(sd_device *device, bool force) { |
57fa1d09 TG |
1310 | _cleanup_free_ char *db = NULL; |
1311 | char *path; | |
1312 | const char *id, *value; | |
1313 | char key; | |
1314 | size_t db_len; | |
1315 | unsigned i; | |
1316 | int r; | |
1317 | ||
1318 | enum { | |
1319 | PRE_KEY, | |
1320 | KEY, | |
1321 | PRE_VALUE, | |
1322 | VALUE, | |
1323 | INVALID_LINE, | |
1324 | } state = PRE_KEY; | |
1325 | ||
107f2e25 | 1326 | if (device->db_loaded || (!force && device->sealed)) |
57fa1d09 TG |
1327 | return 0; |
1328 | ||
7141e4f6 TG |
1329 | device->db_loaded = true; |
1330 | ||
57fa1d09 TG |
1331 | r = device_get_id_filename(device, &id); |
1332 | if (r < 0) | |
1333 | return r; | |
1334 | ||
1335 | path = strjoina("/run/udev/data/", id); | |
1336 | ||
1337 | r = read_full_file(path, &db, &db_len); | |
1338 | if (r < 0) { | |
1339 | if (r == -ENOENT) | |
1340 | return 0; | |
e53fc357 LP |
1341 | else |
1342 | return log_debug_errno(r, "sd-device: failed to read db '%s': %m", path); | |
57fa1d09 TG |
1343 | } |
1344 | ||
1345 | /* devices with a database entry are initialized */ | |
7e518afa | 1346 | device->is_initialized = true; |
57fa1d09 TG |
1347 | |
1348 | for (i = 0; i < db_len; i++) { | |
1349 | switch (state) { | |
1350 | case PRE_KEY: | |
1351 | if (!strchr(NEWLINE, db[i])) { | |
1352 | key = db[i]; | |
1353 | ||
1354 | state = KEY; | |
1355 | } | |
1356 | ||
1357 | break; | |
1358 | case KEY: | |
1359 | if (db[i] != ':') { | |
1360 | log_debug("sd-device: ignoring invalid db entry with key '%c'", key); | |
1361 | ||
1362 | state = INVALID_LINE; | |
1363 | } else { | |
1364 | db[i] = '\0'; | |
1365 | ||
1366 | state = PRE_VALUE; | |
1367 | } | |
1368 | ||
1369 | break; | |
1370 | case PRE_VALUE: | |
1371 | value = &db[i]; | |
1372 | ||
1373 | state = VALUE; | |
1374 | ||
1375 | break; | |
1376 | case INVALID_LINE: | |
1377 | if (strchr(NEWLINE, db[i])) | |
1378 | state = PRE_KEY; | |
1379 | ||
1380 | break; | |
1381 | case VALUE: | |
1382 | if (strchr(NEWLINE, db[i])) { | |
1383 | db[i] = '\0'; | |
1384 | r = handle_db_line(device, key, value); | |
1385 | if (r < 0) | |
19c29853 | 1386 | log_debug_errno(r, "sd-device: failed to handle db entry '%c:%s': %m", key, value); |
57fa1d09 TG |
1387 | |
1388 | state = PRE_KEY; | |
1389 | } | |
1390 | ||
1391 | break; | |
1392 | default: | |
1393 | assert_not_reached("invalid state when parsing db"); | |
1394 | } | |
1395 | } | |
1396 | ||
57fa1d09 TG |
1397 | return 0; |
1398 | } | |
1399 | ||
107f2e25 TG |
1400 | static int device_read_db(sd_device *device) { |
1401 | return device_read_db_aux(device, false); | |
1402 | } | |
1403 | ||
57fa1d09 TG |
1404 | _public_ int sd_device_get_is_initialized(sd_device *device, int *initialized) { |
1405 | int r; | |
1406 | ||
1407 | assert_return(device, -EINVAL); | |
1408 | assert_return(initialized, -EINVAL); | |
1409 | ||
1410 | r = device_read_db(device); | |
1411 | if (r < 0) | |
1412 | return r; | |
1413 | ||
1414 | *initialized = device->is_initialized; | |
1415 | ||
1416 | return 0; | |
1417 | } | |
1418 | ||
1419 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) { | |
1420 | usec_t now_ts; | |
1421 | int r; | |
1422 | ||
1423 | assert_return(device, -EINVAL); | |
1424 | assert_return(usec, -EINVAL); | |
1425 | ||
1426 | r = device_read_db(device); | |
1427 | if (r < 0) | |
1428 | return r; | |
1429 | ||
1430 | if (!device->is_initialized) | |
1431 | return -EBUSY; | |
1432 | ||
1433 | if (!device->usec_initialized) | |
1434 | return -ENODATA; | |
1435 | ||
1436 | now_ts = now(clock_boottime_or_monotonic()); | |
1437 | ||
1438 | if (now_ts < device->usec_initialized) | |
1439 | return -EIO; | |
1440 | ||
1441 | *usec = now_ts - device->usec_initialized; | |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1447 | void *v; |
1448 | ||
57fa1d09 TG |
1449 | assert_return(device, NULL); |
1450 | ||
1451 | (void) device_read_db(device); | |
1452 | ||
1453 | device->tags_iterator_generation = device->tags_generation; | |
1454 | device->tags_iterator = ITERATOR_FIRST; | |
1455 | ||
bccfe92e | 1456 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1457 | return v; |
57fa1d09 TG |
1458 | } |
1459 | ||
1460 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1461 | void *v; |
1462 | ||
57fa1d09 TG |
1463 | assert_return(device, NULL); |
1464 | ||
1465 | (void) device_read_db(device); | |
1466 | ||
1467 | if (device->tags_iterator_generation != device->tags_generation) | |
1468 | return NULL; | |
1469 | ||
bccfe92e | 1470 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1471 | return v; |
57fa1d09 TG |
1472 | } |
1473 | ||
1474 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1475 | void *v; |
1476 | ||
57fa1d09 TG |
1477 | assert_return(device, NULL); |
1478 | ||
1479 | (void) device_read_db(device); | |
1480 | ||
1481 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1482 | device->devlinks_iterator = ITERATOR_FIRST; | |
1483 | ||
bccfe92e | 1484 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1485 | return v; |
57fa1d09 TG |
1486 | } |
1487 | ||
1488 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1489 | void *v; |
1490 | ||
57fa1d09 TG |
1491 | assert_return(device, NULL); |
1492 | ||
1493 | (void) device_read_db(device); | |
1494 | ||
1495 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1496 | return NULL; | |
1497 | ||
bccfe92e | 1498 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1499 | return v; |
57fa1d09 TG |
1500 | } |
1501 | ||
1502 | static int device_properties_prepare(sd_device *device) { | |
1503 | int r; | |
1504 | ||
1505 | assert(device); | |
1506 | ||
1507 | r = device_read_uevent_file(device); | |
1508 | if (r < 0) | |
1509 | return r; | |
1510 | ||
1511 | r = device_read_db(device); | |
1512 | if (r < 0) | |
1513 | return r; | |
1514 | ||
1515 | if (device->property_devlinks_outdated) { | |
1d88a271 MP |
1516 | _cleanup_free_ char *devlinks = NULL; |
1517 | size_t devlinks_allocated = 0, devlinks_len = 0; | |
57fa1d09 TG |
1518 | const char *devlink; |
1519 | ||
1d88a271 MP |
1520 | for (devlink = sd_device_get_devlink_first(device); devlink; devlink = sd_device_get_devlink_next(device)) { |
1521 | char *e; | |
57fa1d09 | 1522 | |
1d88a271 MP |
1523 | if (!GREEDY_REALLOC(devlinks, devlinks_allocated, devlinks_len + strlen(devlink) + 2)) |
1524 | return -ENOMEM; | |
1525 | if (devlinks_len > 0) | |
1526 | stpcpy(devlinks + devlinks_len++, " "); | |
1527 | e = stpcpy(devlinks + devlinks_len, devlink); | |
1528 | devlinks_len = e - devlinks; | |
1529 | } | |
57fa1d09 TG |
1530 | |
1531 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1532 | if (r < 0) | |
1533 | return r; | |
1534 | ||
1535 | device->property_devlinks_outdated = false; | |
1536 | } | |
1537 | ||
1538 | if (device->property_tags_outdated) { | |
1d88a271 MP |
1539 | _cleanup_free_ char *tags = NULL; |
1540 | size_t tags_allocated = 0, tags_len = 0; | |
57fa1d09 TG |
1541 | const char *tag; |
1542 | ||
1d88a271 MP |
1543 | if (!GREEDY_REALLOC(tags, tags_allocated, 2)) |
1544 | return -ENOMEM; | |
1545 | stpcpy(tags, ":"); | |
1546 | tags_len++; | |
57fa1d09 | 1547 | |
1d88a271 MP |
1548 | for (tag = sd_device_get_tag_first(device); tag; tag = sd_device_get_tag_next(device)) { |
1549 | char *e; | |
57fa1d09 | 1550 | |
817ec8cc | 1551 | if (!GREEDY_REALLOC(tags, tags_allocated, tags_len + strlen(tag) + 2)) |
1d88a271 MP |
1552 | return -ENOMEM; |
1553 | e = stpcpy(stpcpy(tags + tags_len, tag), ":"); | |
1554 | tags_len = e - tags; | |
1555 | } | |
57fa1d09 TG |
1556 | |
1557 | r = device_add_property_internal(device, "TAGS", tags); | |
1558 | if (r < 0) | |
1559 | return r; | |
1560 | ||
1561 | device->property_tags_outdated = false; | |
1562 | } | |
1563 | ||
1564 | return 0; | |
1565 | } | |
1566 | ||
1567 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
1568 | const char *key; | |
1569 | const char *value; | |
1570 | int r; | |
1571 | ||
1572 | assert_return(device, NULL); | |
1573 | ||
1574 | r = device_properties_prepare(device); | |
1575 | if (r < 0) | |
1576 | return NULL; | |
1577 | ||
1578 | device->properties_iterator_generation = device->properties_generation; | |
1579 | device->properties_iterator = ITERATOR_FIRST; | |
1580 | ||
8927b1da | 1581 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1582 | |
1583 | if (_value) | |
1584 | *_value = value; | |
1585 | ||
1586 | return key; | |
1587 | } | |
1588 | ||
1589 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
1590 | const char *key; | |
1591 | const char *value; | |
1592 | int r; | |
1593 | ||
1594 | assert_return(device, NULL); | |
1595 | ||
1596 | r = device_properties_prepare(device); | |
1597 | if (r < 0) | |
1598 | return NULL; | |
1599 | ||
1600 | if (device->properties_iterator_generation != device->properties_generation) | |
1601 | return NULL; | |
1602 | ||
8927b1da | 1603 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1604 | |
1605 | if (_value) | |
1606 | *_value = value; | |
1607 | ||
1608 | return key; | |
1609 | } | |
1610 | ||
1611 | static int device_sysattrs_read_all(sd_device *device) { | |
1612 | _cleanup_closedir_ DIR *dir = NULL; | |
1613 | const char *syspath; | |
1614 | struct dirent *dent; | |
1615 | int r; | |
1616 | ||
1617 | assert(device); | |
1618 | ||
1619 | if (device->sysattrs_read) | |
1620 | return 0; | |
1621 | ||
1622 | r = sd_device_get_syspath(device, &syspath); | |
1623 | if (r < 0) | |
1624 | return r; | |
1625 | ||
1626 | dir = opendir(syspath); | |
1627 | if (!dir) | |
1628 | return -errno; | |
1629 | ||
1630 | r = set_ensure_allocated(&device->sysattrs, &string_hash_ops); | |
1631 | if (r < 0) | |
1632 | return r; | |
1633 | ||
8fb3f009 | 1634 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
57fa1d09 TG |
1635 | char *path; |
1636 | struct stat statbuf; | |
1637 | ||
1638 | /* only handle symlinks and regular files */ | |
945c2931 | 1639 | if (!IN_SET(dent->d_type, DT_LNK, DT_REG)) |
57fa1d09 TG |
1640 | continue; |
1641 | ||
1642 | path = strjoina(syspath, "/", dent->d_name); | |
1643 | ||
1644 | if (lstat(path, &statbuf) != 0) | |
1645 | continue; | |
1646 | ||
1647 | if (!(statbuf.st_mode & S_IRUSR)) | |
1648 | continue; | |
1649 | ||
1650 | r = set_put_strdup(device->sysattrs, dent->d_name); | |
1651 | if (r < 0) | |
1652 | return r; | |
1653 | } | |
1654 | ||
1655 | device->sysattrs_read = true; | |
1656 | ||
1657 | return 0; | |
1658 | } | |
1659 | ||
1660 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 1661 | void *v; |
57fa1d09 TG |
1662 | int r; |
1663 | ||
1664 | assert_return(device, NULL); | |
1665 | ||
1666 | if (!device->sysattrs_read) { | |
1667 | r = device_sysattrs_read_all(device); | |
1668 | if (r < 0) { | |
1669 | errno = -r; | |
1670 | return NULL; | |
1671 | } | |
1672 | } | |
1673 | ||
1674 | device->sysattrs_iterator = ITERATOR_FIRST; | |
1675 | ||
bccfe92e | 1676 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1677 | return v; |
57fa1d09 TG |
1678 | } |
1679 | ||
1680 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
1681 | void *v; |
1682 | ||
57fa1d09 TG |
1683 | assert_return(device, NULL); |
1684 | ||
1685 | if (!device->sysattrs_read) | |
1686 | return NULL; | |
1687 | ||
bccfe92e | 1688 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1689 | return v; |
57fa1d09 TG |
1690 | } |
1691 | ||
1692 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
1693 | assert_return(device, -EINVAL); | |
1694 | assert_return(tag, -EINVAL); | |
1695 | ||
1696 | (void) device_read_db(device); | |
1697 | ||
1698 | return !!set_contains(device->tags, tag); | |
1699 | } | |
1700 | ||
1701 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) { | |
1702 | char *value; | |
1703 | int r; | |
1704 | ||
1705 | assert_return(device, -EINVAL); | |
1706 | assert_return(key, -EINVAL); | |
1707 | assert_return(_value, -EINVAL); | |
1708 | ||
1709 | r = device_properties_prepare(device); | |
1710 | if (r < 0) | |
1711 | return r; | |
1712 | ||
1713 | value = ordered_hashmap_get(device->properties, key); | |
1714 | if (!value) | |
1715 | return -ENOENT; | |
1716 | ||
1717 | *_value = value; | |
1718 | ||
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | /* replaces the value if it already exists */ | |
2fe29a46 | 1723 | static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) { |
57fa1d09 | 1724 | _cleanup_free_ char *key = NULL; |
2fe29a46 | 1725 | _cleanup_free_ char *value_old = NULL; |
57fa1d09 TG |
1726 | int r; |
1727 | ||
1728 | assert(device); | |
1729 | assert(_key); | |
1730 | ||
1731 | r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops); | |
1732 | if (r < 0) | |
1733 | return r; | |
1734 | ||
2fe29a46 | 1735 | value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key); |
57fa1d09 TG |
1736 | if (!key) { |
1737 | key = strdup(_key); | |
1738 | if (!key) | |
1739 | return -ENOMEM; | |
1740 | } | |
1741 | ||
57fa1d09 TG |
1742 | r = hashmap_put(device->sysattr_values, key, value); |
1743 | if (r < 0) | |
1744 | return r; | |
1745 | ||
1746 | key = NULL; | |
57fa1d09 TG |
1747 | |
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) { | |
1752 | const char *key = NULL, *value; | |
1753 | ||
1754 | assert(device); | |
1755 | assert(_key); | |
1756 | ||
1757 | value = hashmap_get2(device->sysattr_values, _key, (void **) &key); | |
1758 | if (!key) | |
1759 | return -ENOENT; | |
1760 | ||
1761 | if (_value) | |
1762 | *_value = value; | |
1763 | ||
1764 | return 0; | |
1765 | } | |
1766 | ||
1767 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
1768 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
1769 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) { | |
1770 | _cleanup_free_ char *value = NULL; | |
1771 | const char *syspath, *cached_value = NULL; | |
1772 | char *path; | |
1773 | struct stat statbuf; | |
1774 | int r; | |
1775 | ||
1776 | assert_return(device, -EINVAL); | |
1777 | assert_return(sysattr, -EINVAL); | |
1778 | ||
1779 | /* look for possibly already cached result */ | |
1780 | r = device_get_sysattr_value(device, sysattr, &cached_value); | |
1781 | if (r != -ENOENT) { | |
1782 | if (r < 0) | |
1783 | return r; | |
1784 | ||
1785 | if (!cached_value) | |
1786 | /* we looked up the sysattr before and it did not exist */ | |
1787 | return -ENOENT; | |
1788 | ||
1789 | if (_value) | |
1790 | *_value = cached_value; | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | r = sd_device_get_syspath(device, &syspath); | |
1796 | if (r < 0) | |
1797 | return r; | |
1798 | ||
1799 | path = strjoina(syspath, "/", sysattr); | |
1800 | r = lstat(path, &statbuf); | |
1801 | if (r < 0) { | |
1802 | /* remember that we could not access the sysattr */ | |
1803 | r = device_add_sysattr_value(device, sysattr, NULL); | |
1804 | if (r < 0) | |
1805 | return r; | |
1806 | ||
1807 | return -ENOENT; | |
1808 | } else if (S_ISLNK(statbuf.st_mode)) { | |
1809 | /* Some core links return only the last element of the target path, | |
1810 | * these are just values, the paths should not be exposed. */ | |
1811 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
1812 | r = readlink_value(path, &value); | |
1813 | if (r < 0) | |
1814 | return r; | |
1815 | } else | |
1816 | return -EINVAL; | |
1817 | } else if (S_ISDIR(statbuf.st_mode)) { | |
1818 | /* skip directories */ | |
1819 | return -EINVAL; | |
1820 | } else if (!(statbuf.st_mode & S_IRUSR)) { | |
1821 | /* skip non-readable files */ | |
1822 | return -EPERM; | |
1823 | } else { | |
1824 | size_t size; | |
1825 | ||
1826 | /* read attribute value */ | |
1827 | r = read_full_file(path, &value, &size); | |
1828 | if (r < 0) | |
1829 | return r; | |
1830 | ||
1831 | /* drop trailing newlines */ | |
1832 | while (size > 0 && value[--size] == '\n') | |
1833 | value[size] = '\0'; | |
1834 | } | |
1835 | ||
1836 | r = device_add_sysattr_value(device, sysattr, value); | |
1837 | if (r < 0) | |
1838 | return r; | |
1839 | ||
1840 | *_value = value; | |
1841 | value = NULL; | |
1842 | ||
1843 | return 0; | |
1844 | } | |
1845 | ||
1846 | static void device_remove_sysattr_value(sd_device *device, const char *_key) { | |
1847 | _cleanup_free_ char *key = NULL; | |
1848 | _cleanup_free_ char *value = NULL; | |
1849 | ||
1850 | assert(device); | |
1851 | assert(_key); | |
1852 | ||
1853 | value = hashmap_remove2(device->sysattr_values, _key, (void **) &key); | |
1854 | ||
1855 | return; | |
1856 | } | |
1857 | ||
1858 | /* set the attribute and save it in the cache. If a NULL value is passed the | |
1859 | * attribute is cleared from the cache */ | |
2fe29a46 | 1860 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, char *_value) { |
57fa1d09 | 1861 | _cleanup_close_ int fd = -1; |
2fe29a46 | 1862 | _cleanup_free_ char *value = NULL; |
57fa1d09 TG |
1863 | const char *syspath; |
1864 | char *path; | |
2fa4861a | 1865 | size_t len = 0; |
57fa1d09 TG |
1866 | ssize_t size; |
1867 | int r; | |
1868 | ||
1869 | assert_return(device, -EINVAL); | |
1870 | assert_return(sysattr, -EINVAL); | |
1871 | ||
2fe29a46 | 1872 | if (!_value) { |
57fa1d09 TG |
1873 | device_remove_sysattr_value(device, sysattr); |
1874 | ||
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | r = sd_device_get_syspath(device, &syspath); | |
1879 | if (r < 0) | |
1880 | return r; | |
1881 | ||
1882 | path = strjoina(syspath, "/", sysattr); | |
2fa4861a ZJS |
1883 | |
1884 | fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); | |
1885 | if (fd < 0) { | |
1886 | if (errno == ELOOP) | |
1887 | return -EINVAL; | |
1888 | if (errno == EISDIR) | |
1889 | return -EISDIR; | |
1890 | ||
2fe29a46 TG |
1891 | value = strdup(""); |
1892 | if (!value) | |
1893 | return -ENOMEM; | |
1894 | ||
1895 | r = device_add_sysattr_value(device, sysattr, value); | |
57fa1d09 TG |
1896 | if (r < 0) |
1897 | return r; | |
3bd82598 | 1898 | value = NULL; |
57fa1d09 TG |
1899 | |
1900 | return -ENXIO; | |
1901 | } | |
1902 | ||
2fa4861a | 1903 | len = strlen(_value); |
57fa1d09 TG |
1904 | |
1905 | /* drop trailing newlines */ | |
2fa4861a ZJS |
1906 | while (len > 0 && _value[len - 1] == '\n') |
1907 | len --; | |
57fa1d09 TG |
1908 | |
1909 | /* value length is limited to 4k */ | |
2fa4861a | 1910 | if (len > 4096) |
57fa1d09 TG |
1911 | return -EINVAL; |
1912 | ||
2fa4861a | 1913 | value = strndup(_value, len); |
2fe29a46 TG |
1914 | if (!value) |
1915 | return -ENOMEM; | |
1916 | ||
2fa4861a | 1917 | size = write(fd, value, len); |
57fa1d09 TG |
1918 | if (size < 0) |
1919 | return -errno; | |
1920 | ||
2fa4861a | 1921 | if ((size_t)size != len) |
57fa1d09 TG |
1922 | return -EIO; |
1923 | ||
1924 | r = device_add_sysattr_value(device, sysattr, value); | |
1925 | if (r < 0) | |
1926 | return r; | |
2fe29a46 TG |
1927 | value = NULL; |
1928 | ||
57fa1d09 TG |
1929 | return 0; |
1930 | } |