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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
57fa1d09 TG |
2 | |
3 | #include <ctype.h> | |
57fa1d09 | 4 | #include <net/if.h> |
07630cea | 5 | #include <sys/types.h> |
57fa1d09 | 6 | |
07630cea LP |
7 | #include "sd-device.h" |
8 | ||
b5efdb8a | 9 | #include "alloc-util.h" |
07630cea LP |
10 | #include "device-internal.h" |
11 | #include "device-private.h" | |
12 | #include "device-util.h" | |
8fb3f009 | 13 | #include "dirent-util.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
57fa1d09 | 15 | #include "fileio.h" |
f4f15635 | 16 | #include "fs-util.h" |
57fa1d09 | 17 | #include "hashmap.h" |
07630cea | 18 | #include "macro.h" |
6bedfcbb | 19 | #include "parse-util.h" |
07630cea | 20 | #include "path-util.h" |
57fa1d09 | 21 | #include "set.h" |
429b4350 | 22 | #include "socket-util.h" |
8fcde012 | 23 | #include "stat-util.h" |
07630cea | 24 | #include "string-util.h" |
57fa1d09 | 25 | #include "strv.h" |
07630cea LP |
26 | #include "strxcpyx.h" |
27 | #include "util.h" | |
57fa1d09 TG |
28 | |
29 | int device_new_aux(sd_device **ret) { | |
1cc6c93a | 30 | sd_device *device = NULL; |
57fa1d09 TG |
31 | |
32 | assert(ret); | |
33 | ||
6116d2b2 | 34 | device = new(sd_device, 1); |
57fa1d09 TG |
35 | if (!device) |
36 | return -ENOMEM; | |
37 | ||
6116d2b2 YW |
38 | *device = (sd_device) { |
39 | .n_ref = 1, | |
40 | .watch_handle = -1, | |
41 | }; | |
57fa1d09 TG |
42 | |
43 | *ret = device; | |
57fa1d09 TG |
44 | return 0; |
45 | } | |
46 | ||
8301aa0b YW |
47 | static sd_device *device_free(sd_device *device) { |
48 | assert(device); | |
57fa1d09 | 49 | |
8301aa0b YW |
50 | sd_device_unref(device->parent); |
51 | free(device->syspath); | |
52 | free(device->sysname); | |
53 | free(device->devtype); | |
54 | free(device->devname); | |
55 | free(device->subsystem); | |
56 | free(device->driver_subsystem); | |
57 | free(device->driver); | |
58 | free(device->id_filename); | |
59 | free(device->properties_strv); | |
60 | free(device->properties_nulstr); | |
61 | ||
62 | ordered_hashmap_free_free_free(device->properties); | |
63 | ordered_hashmap_free_free_free(device->properties_db); | |
64 | hashmap_free_free_free(device->sysattr_values); | |
65 | set_free_free(device->sysattrs); | |
66 | set_free_free(device->tags); | |
67 | set_free_free(device->devlinks); | |
68 | ||
69 | return mfree(device); | |
57fa1d09 TG |
70 | } |
71 | ||
8301aa0b | 72 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device, sd_device, device_free); |
57fa1d09 TG |
73 | |
74 | int device_add_property_aux(sd_device *device, const char *_key, const char *_value, bool db) { | |
75 | OrderedHashmap **properties; | |
76 | ||
77 | assert(device); | |
78 | assert(_key); | |
79 | ||
80 | if (db) | |
81 | properties = &device->properties_db; | |
82 | else | |
83 | properties = &device->properties; | |
84 | ||
85 | if (_value) { | |
86 | _cleanup_free_ char *key = NULL, *value = NULL, *old_key = NULL, *old_value = NULL; | |
87 | int r; | |
88 | ||
89 | r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops); | |
90 | if (r < 0) | |
91 | return r; | |
92 | ||
93 | key = strdup(_key); | |
94 | if (!key) | |
95 | return -ENOMEM; | |
96 | ||
97 | value = strdup(_value); | |
98 | if (!value) | |
99 | return -ENOMEM; | |
100 | ||
101 | old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key); | |
102 | ||
103 | r = ordered_hashmap_replace(*properties, key, value); | |
104 | if (r < 0) | |
105 | return r; | |
106 | ||
107 | key = NULL; | |
108 | value = NULL; | |
109 | } else { | |
110 | _cleanup_free_ char *key = NULL; | |
111 | _cleanup_free_ char *value = NULL; | |
112 | ||
113 | value = ordered_hashmap_remove2(*properties, _key, (void**) &key); | |
114 | } | |
115 | ||
116 | if (!db) { | |
313cefa1 | 117 | device->properties_generation++; |
57fa1d09 TG |
118 | device->properties_buf_outdated = true; |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | int device_add_property_internal(sd_device *device, const char *key, const char *value) { | |
125 | return device_add_property_aux(device, key, value, false); | |
126 | } | |
127 | ||
128 | int device_set_syspath(sd_device *device, const char *_syspath, bool verify) { | |
129 | _cleanup_free_ char *syspath = NULL; | |
130 | const char *devpath; | |
131 | int r; | |
132 | ||
133 | assert(device); | |
134 | assert(_syspath); | |
135 | ||
136 | /* must be a subdirectory of /sys */ | |
137 | if (!path_startswith(_syspath, "/sys/")) { | |
138 | log_debug("sd-device: syspath '%s' is not a subdirectory of /sys", _syspath); | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | if (verify) { | |
5bbe8eab | 143 | r = chase_symlinks(_syspath, NULL, 0, &syspath); |
08232a02 | 144 | if (r == -ENOENT) |
d89e0dc8 LP |
145 | return -ENODEV; /* the device does not exist (any more?) */ |
146 | if (r < 0) | |
147 | return log_debug_errno(r, "sd-device: could not get target of '%s': %m", _syspath); | |
57fa1d09 | 148 | |
2e1ec12e YW |
149 | if (!path_startswith(syspath, "/sys")) { |
150 | _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL; | |
151 | char *p; | |
152 | ||
153 | /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */ | |
154 | r = chase_symlinks("/sys", NULL, 0, &real_sys); | |
155 | if (r < 0) | |
156 | return log_debug_errno(r, "sd-device: could not chase symlink /sys: %m"); | |
157 | ||
158 | p = path_startswith(syspath, real_sys); | |
159 | if (!p) { | |
160 | log_debug("sd-device: canonicalized path '%s' does not starts with sysfs mount point '%s'", syspath, real_sys); | |
161 | return -ENODEV; | |
162 | } | |
163 | ||
164 | new_syspath = strjoin("/sys/", p); | |
165 | if (!new_syspath) | |
166 | return log_oom(); | |
167 | ||
168 | free_and_replace(syspath, new_syspath); | |
858d36c1 | 169 | path_simplify(syspath, false); |
2e1ec12e YW |
170 | } |
171 | ||
57fa1d09 TG |
172 | if (path_startswith(syspath, "/sys/devices/")) { |
173 | char *path; | |
174 | ||
175 | /* all 'devices' require an 'uevent' file */ | |
176 | path = strjoina(syspath, "/uevent"); | |
177 | r = access(path, F_OK); | |
178 | if (r < 0) { | |
52d62901 TG |
179 | if (errno == ENOENT) |
180 | /* this is not a valid device */ | |
181 | return -ENODEV; | |
182 | ||
25f027c5 | 183 | return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath); |
57fa1d09 TG |
184 | } |
185 | } else { | |
61233823 | 186 | /* everything else just needs to be a directory */ |
52d62901 TG |
187 | if (!is_dir(syspath, false)) |
188 | return -ENODEV; | |
57fa1d09 TG |
189 | } |
190 | } else { | |
191 | syspath = strdup(_syspath); | |
192 | if (!syspath) | |
193 | return -ENOMEM; | |
194 | } | |
195 | ||
fbd0b64f | 196 | devpath = syspath + STRLEN("/sys"); |
57fa1d09 TG |
197 | |
198 | r = device_add_property_internal(device, "DEVPATH", devpath); | |
199 | if (r < 0) | |
200 | return r; | |
201 | ||
f9ecfd3b | 202 | free_and_replace(device->syspath, syspath); |
57fa1d09 TG |
203 | |
204 | device->devpath = devpath; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { | |
4afd3348 | 210 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
211 | int r; |
212 | ||
213 | assert_return(ret, -EINVAL); | |
214 | assert_return(syspath, -EINVAL); | |
215 | ||
216 | r = device_new_aux(&device); | |
217 | if (r < 0) | |
218 | return r; | |
219 | ||
220 | r = device_set_syspath(device, syspath, true); | |
221 | if (r < 0) | |
222 | return r; | |
223 | ||
1cc6c93a | 224 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
225 | |
226 | return 0; | |
227 | } | |
228 | ||
229 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
230 | char *syspath; | |
231 | char id[DECIMAL_STR_MAX(unsigned) * 2 + 1]; | |
232 | ||
233 | assert_return(ret, -EINVAL); | |
945c2931 | 234 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); |
57fa1d09 TG |
235 | |
236 | /* use /sys/dev/{block,char}/<maj>:<min> link */ | |
237 | snprintf(id, sizeof(id), "%u:%u", major(devnum), minor(devnum)); | |
238 | ||
239 | syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id); | |
240 | ||
241 | return sd_device_new_from_syspath(ret, syspath); | |
242 | } | |
243 | ||
244 | _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) { | |
21d6220f TG |
245 | char *name, *syspath; |
246 | size_t len = 0; | |
57fa1d09 TG |
247 | |
248 | assert_return(ret, -EINVAL); | |
249 | assert_return(subsystem, -EINVAL); | |
250 | assert_return(sysname, -EINVAL); | |
251 | ||
252 | if (streq(subsystem, "subsystem")) { | |
253 | syspath = strjoina("/sys/subsystem/", sysname); | |
254 | if (access(syspath, F_OK) >= 0) | |
255 | return sd_device_new_from_syspath(ret, syspath); | |
256 | ||
257 | syspath = strjoina("/sys/bus/", sysname); | |
258 | if (access(syspath, F_OK) >= 0) | |
259 | return sd_device_new_from_syspath(ret, syspath); | |
260 | ||
261 | syspath = strjoina("/sys/class/", sysname); | |
262 | if (access(syspath, F_OK) >= 0) | |
263 | return sd_device_new_from_syspath(ret, syspath); | |
264 | } else if (streq(subsystem, "module")) { | |
265 | syspath = strjoina("/sys/module/", sysname); | |
266 | if (access(syspath, F_OK) >= 0) | |
267 | return sd_device_new_from_syspath(ret, syspath); | |
268 | } else if (streq(subsystem, "drivers")) { | |
269 | char subsys[PATH_MAX]; | |
270 | char *driver; | |
271 | ||
272 | strscpy(subsys, sizeof(subsys), sysname); | |
273 | driver = strchr(subsys, ':'); | |
274 | if (driver) { | |
275 | driver[0] = '\0'; | |
276 | driver++; | |
277 | ||
278 | syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver); | |
279 | if (access(syspath, F_OK) >= 0) | |
280 | return sd_device_new_from_syspath(ret, syspath); | |
281 | ||
282 | syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver); | |
283 | if (access(syspath, F_OK) >= 0) | |
284 | return sd_device_new_from_syspath(ret, syspath); | |
21d6220f TG |
285 | } |
286 | } | |
a9ec9f29 | 287 | |
21d6220f TG |
288 | /* translate sysname back to sysfs filename */ |
289 | name = strdupa(sysname); | |
290 | while (name[len] != '\0') { | |
291 | if (name[len] == '/') | |
292 | name[len] = '!'; | |
a9ec9f29 | 293 | |
21d6220f TG |
294 | len++; |
295 | } | |
a9ec9f29 | 296 | |
21d6220f TG |
297 | syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name); |
298 | if (access(syspath, F_OK) >= 0) | |
299 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 300 | |
21d6220f TG |
301 | syspath = strjoina("/sys/bus/", subsystem, "/devices/", name); |
302 | if (access(syspath, F_OK) >= 0) | |
303 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 304 | |
21d6220f TG |
305 | syspath = strjoina("/sys/class/", subsystem, "/", name); |
306 | if (access(syspath, F_OK) >= 0) | |
307 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 308 | |
a918b673 PK |
309 | syspath = strjoina("/sys/firmware/", subsystem, "/", sysname); |
310 | if (access(syspath, F_OK) >= 0) | |
311 | return sd_device_new_from_syspath(ret, syspath); | |
312 | ||
08232a02 | 313 | return -ENODEV; |
57fa1d09 TG |
314 | } |
315 | ||
316 | int device_set_devtype(sd_device *device, const char *_devtype) { | |
317 | _cleanup_free_ char *devtype = NULL; | |
318 | int r; | |
319 | ||
320 | assert(device); | |
321 | assert(_devtype); | |
322 | ||
323 | devtype = strdup(_devtype); | |
324 | if (!devtype) | |
325 | return -ENOMEM; | |
326 | ||
327 | r = device_add_property_internal(device, "DEVTYPE", devtype); | |
328 | if (r < 0) | |
329 | return r; | |
330 | ||
f9ecfd3b | 331 | free_and_replace(device->devtype, devtype); |
57fa1d09 TG |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
336 | int device_set_ifindex(sd_device *device, const char *_ifindex) { | |
337 | int ifindex, r; | |
338 | ||
339 | assert(device); | |
340 | assert(_ifindex); | |
341 | ||
6ad623a3 | 342 | r = parse_ifindex(_ifindex, &ifindex); |
57fa1d09 TG |
343 | if (r < 0) |
344 | return r; | |
345 | ||
57fa1d09 TG |
346 | r = device_add_property_internal(device, "IFINDEX", _ifindex); |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | device->ifindex = ifindex; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | int device_set_devname(sd_device *device, const char *_devname) { | |
356 | _cleanup_free_ char *devname = NULL; | |
357 | int r; | |
358 | ||
359 | assert(device); | |
360 | assert(_devname); | |
361 | ||
362 | if (_devname[0] != '/') { | |
363 | r = asprintf(&devname, "/dev/%s", _devname); | |
364 | if (r < 0) | |
365 | return -ENOMEM; | |
366 | } else { | |
367 | devname = strdup(_devname); | |
368 | if (!devname) | |
369 | return -ENOMEM; | |
370 | } | |
371 | ||
372 | r = device_add_property_internal(device, "DEVNAME", devname); | |
373 | if (r < 0) | |
374 | return r; | |
375 | ||
f9ecfd3b | 376 | free_and_replace(device->devname, devname); |
57fa1d09 TG |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
381 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
382 | unsigned devmode; | |
383 | int r; | |
384 | ||
385 | assert(device); | |
386 | assert(_devmode); | |
387 | ||
388 | r = safe_atou(_devmode, &devmode); | |
389 | if (r < 0) | |
390 | return r; | |
391 | ||
392 | if (devmode > 07777) | |
393 | return -EINVAL; | |
394 | ||
395 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
396 | if (r < 0) | |
397 | return r; | |
398 | ||
399 | device->devmode = devmode; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
405 | unsigned maj = 0, min = 0; | |
406 | int r; | |
407 | ||
408 | assert(device); | |
409 | assert(major); | |
410 | ||
411 | r = safe_atou(major, &maj); | |
412 | if (r < 0) | |
413 | return r; | |
414 | if (!maj) | |
415 | return 0; | |
416 | ||
417 | if (minor) { | |
418 | r = safe_atou(minor, &min); | |
419 | if (r < 0) | |
420 | return r; | |
421 | } | |
422 | ||
423 | r = device_add_property_internal(device, "MAJOR", major); | |
424 | if (r < 0) | |
425 | return r; | |
426 | ||
427 | if (minor) { | |
428 | r = device_add_property_internal(device, "MINOR", minor); | |
429 | if (r < 0) | |
430 | return r; | |
431 | } | |
432 | ||
433 | device->devnum = makedev(maj, min); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) { | |
439 | int r; | |
440 | ||
441 | assert(device); | |
442 | assert(key); | |
443 | assert(value); | |
444 | assert(major); | |
445 | assert(minor); | |
446 | ||
447 | if (streq(key, "DEVTYPE")) { | |
448 | r = device_set_devtype(device, value); | |
449 | if (r < 0) | |
450 | return r; | |
451 | } else if (streq(key, "IFINDEX")) { | |
452 | r = device_set_ifindex(device, value); | |
453 | if (r < 0) | |
454 | return r; | |
455 | } else if (streq(key, "DEVNAME")) { | |
456 | r = device_set_devname(device, value); | |
457 | if (r < 0) | |
458 | return r; | |
459 | } else if (streq(key, "DEVMODE")) { | |
460 | r = device_set_devmode(device, value); | |
461 | if (r < 0) | |
462 | return r; | |
463 | } else if (streq(key, "MAJOR")) | |
464 | *major = value; | |
465 | else if (streq(key, "MINOR")) | |
466 | *minor = value; | |
467 | else { | |
468 | r = device_add_property_internal(device, key, value); | |
469 | if (r < 0) | |
470 | return r; | |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | int device_read_uevent_file(sd_device *device) { | |
477 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 478 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
479 | char *path; |
480 | size_t uevent_len; | |
481 | unsigned i; | |
482 | int r; | |
483 | ||
484 | enum { | |
485 | PRE_KEY, | |
486 | KEY, | |
487 | PRE_VALUE, | |
488 | VALUE, | |
489 | INVALID_LINE, | |
490 | } state = PRE_KEY; | |
491 | ||
492 | assert(device); | |
493 | ||
494 | if (device->uevent_loaded || device->sealed) | |
495 | return 0; | |
496 | ||
7141e4f6 TG |
497 | device->uevent_loaded = true; |
498 | ||
57fa1d09 TG |
499 | r = sd_device_get_syspath(device, &syspath); |
500 | if (r < 0) | |
501 | return r; | |
502 | ||
503 | path = strjoina(syspath, "/uevent"); | |
504 | ||
505 | r = read_full_file(path, &uevent, &uevent_len); | |
bba06166 TG |
506 | if (r == -EACCES) |
507 | /* empty uevent files may be write-only */ | |
508 | return 0; | |
2a213740 TG |
509 | else if (r == -ENOENT) |
510 | /* some devices may not have uevent files, see set_syspath() */ | |
511 | return 0; | |
fc95c359 YW |
512 | else if (r < 0) |
513 | return log_debug_errno(r, "sd-device: failed to read uevent file '%s': %m", path); | |
57fa1d09 | 514 | |
755700bb | 515 | for (i = 0; i < uevent_len; i++) |
57fa1d09 TG |
516 | switch (state) { |
517 | case PRE_KEY: | |
518 | if (!strchr(NEWLINE, uevent[i])) { | |
519 | key = &uevent[i]; | |
520 | ||
521 | state = KEY; | |
522 | } | |
523 | ||
524 | break; | |
525 | case KEY: | |
526 | if (uevent[i] == '=') { | |
527 | uevent[i] = '\0'; | |
528 | ||
529 | state = PRE_VALUE; | |
530 | } else if (strchr(NEWLINE, uevent[i])) { | |
531 | uevent[i] = '\0'; | |
532 | log_debug("sd-device: ignoring invalid uevent line '%s'", key); | |
533 | ||
534 | state = PRE_KEY; | |
535 | } | |
536 | ||
537 | break; | |
538 | case PRE_VALUE: | |
539 | value = &uevent[i]; | |
57fa1d09 TG |
540 | state = VALUE; |
541 | ||
4831981d | 542 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
543 | case VALUE: |
544 | if (strchr(NEWLINE, uevent[i])) { | |
545 | uevent[i] = '\0'; | |
546 | ||
547 | r = handle_uevent_line(device, key, value, &major, &minor); | |
548 | if (r < 0) | |
19c29853 | 549 | log_debug_errno(r, "sd-device: failed to handle uevent entry '%s=%s': %m", key, value); |
57fa1d09 TG |
550 | |
551 | state = PRE_KEY; | |
552 | } | |
553 | ||
554 | break; | |
555 | default: | |
556 | assert_not_reached("invalid state when parsing uevent file"); | |
557 | } | |
57fa1d09 TG |
558 | |
559 | if (major) { | |
560 | r = device_set_devnum(device, major, minor); | |
561 | if (r < 0) | |
23446f01 | 562 | log_debug_errno(r, "sd-device: could not set 'MAJOR=%s' or 'MINOR=%s' from '%s': %m", major, minor, path); |
57fa1d09 TG |
563 | } |
564 | ||
57fa1d09 TG |
565 | return 0; |
566 | } | |
567 | ||
568 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
569 | int r; | |
570 | ||
571 | assert_return(device, -EINVAL); | |
572 | assert_return(ifindex, -EINVAL); | |
573 | ||
574 | r = device_read_uevent_file(device); | |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
578 | *ifindex = device->ifindex; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
584 | int r; | |
585 | ||
586 | assert_return(ret, -EINVAL); | |
587 | assert_return(id, -EINVAL); | |
588 | ||
589 | switch (id[0]) { | |
590 | case 'b': | |
591 | case 'c': | |
592 | { | |
593 | char type; | |
594 | int maj, min; | |
595 | ||
596 | r = sscanf(id, "%c%i:%i", &type, &maj, &min); | |
597 | if (r != 3) | |
598 | return -EINVAL; | |
599 | ||
600 | return sd_device_new_from_devnum(ret, type, makedev(maj, min)); | |
601 | } | |
602 | case 'n': | |
603 | { | |
4afd3348 | 604 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
605 | _cleanup_close_ int sk = -1; |
606 | struct ifreq ifr = {}; | |
607 | int ifindex; | |
608 | ||
6ad623a3 | 609 | r = parse_ifindex(&id[1], &ifr.ifr_ifindex); |
57fa1d09 TG |
610 | if (r < 0) |
611 | return r; | |
57fa1d09 | 612 | |
429b4350 | 613 | sk = socket_ioctl_fd(); |
57fa1d09 | 614 | if (sk < 0) |
429b4350 | 615 | return sk; |
57fa1d09 TG |
616 | |
617 | r = ioctl(sk, SIOCGIFNAME, &ifr); | |
618 | if (r < 0) | |
619 | return -errno; | |
620 | ||
621 | r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name); | |
622 | if (r < 0) | |
623 | return r; | |
624 | ||
625 | r = sd_device_get_ifindex(device, &ifindex); | |
626 | if (r < 0) | |
627 | return r; | |
628 | ||
08232a02 | 629 | /* this is racey, so we might end up with the wrong device */ |
57fa1d09 TG |
630 | if (ifr.ifr_ifindex != ifindex) |
631 | return -ENODEV; | |
632 | ||
1cc6c93a | 633 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
634 | |
635 | return 0; | |
636 | } | |
637 | case '+': | |
638 | { | |
639 | char subsys[PATH_MAX]; | |
640 | char *sysname; | |
641 | ||
db2f8a2e | 642 | (void) strscpy(subsys, sizeof(subsys), id + 1); |
57fa1d09 TG |
643 | sysname = strchr(subsys, ':'); |
644 | if (!sysname) | |
645 | return -EINVAL; | |
646 | ||
647 | sysname[0] = '\0'; | |
313cefa1 | 648 | sysname++; |
57fa1d09 TG |
649 | |
650 | return sd_device_new_from_subsystem_sysname(ret, subsys, sysname); | |
651 | } | |
652 | default: | |
653 | return -EINVAL; | |
654 | } | |
655 | } | |
656 | ||
657 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
658 | assert_return(device, -EINVAL); | |
659 | assert_return(ret, -EINVAL); | |
660 | ||
661 | assert(path_startswith(device->syspath, "/sys/")); | |
662 | ||
663 | *ret = device->syspath; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static int device_new_from_child(sd_device **ret, sd_device *child) { | |
669 | _cleanup_free_ char *path = NULL; | |
670 | const char *subdir, *syspath; | |
671 | int r; | |
672 | ||
673 | assert(ret); | |
674 | assert(child); | |
675 | ||
676 | r = sd_device_get_syspath(child, &syspath); | |
677 | if (r < 0) | |
678 | return r; | |
679 | ||
680 | path = strdup(syspath); | |
681 | if (!path) | |
682 | return -ENOMEM; | |
fbd0b64f | 683 | subdir = path + STRLEN("/sys"); |
57fa1d09 TG |
684 | |
685 | for (;;) { | |
686 | char *pos; | |
687 | ||
688 | pos = strrchr(subdir, '/'); | |
689 | if (!pos || pos < subdir + 2) | |
690 | break; | |
691 | ||
692 | *pos = '\0'; | |
693 | ||
694 | r = sd_device_new_from_syspath(ret, path); | |
695 | if (r < 0) | |
696 | continue; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
08232a02 | 701 | return -ENODEV; |
57fa1d09 TG |
702 | } |
703 | ||
704 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
705 | ||
706 | assert_return(ret, -EINVAL); | |
707 | assert_return(child, -EINVAL); | |
708 | ||
709 | if (!child->parent_set) { | |
710 | child->parent_set = true; | |
711 | ||
db2f8a2e | 712 | (void) device_new_from_child(&child->parent, child); |
57fa1d09 TG |
713 | } |
714 | ||
715 | if (!child->parent) | |
716 | return -ENOENT; | |
717 | ||
718 | *ret = child->parent; | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
723 | int device_set_subsystem(sd_device *device, const char *_subsystem) { | |
724 | _cleanup_free_ char *subsystem = NULL; | |
725 | int r; | |
726 | ||
727 | assert(device); | |
728 | assert(_subsystem); | |
729 | ||
730 | subsystem = strdup(_subsystem); | |
731 | if (!subsystem) | |
732 | return -ENOMEM; | |
733 | ||
734 | r = device_add_property_internal(device, "SUBSYSTEM", subsystem); | |
735 | if (r < 0) | |
736 | return r; | |
737 | ||
f9ecfd3b | 738 | free_and_replace(device->subsystem, subsystem); |
57fa1d09 TG |
739 | |
740 | device->subsystem_set = true; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
de7e983e TG |
745 | static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) { |
746 | _cleanup_free_ char *subsystem = NULL; | |
747 | int r; | |
748 | ||
749 | assert(device); | |
750 | assert(_subsystem); | |
751 | assert(*_subsystem); | |
752 | ||
753 | subsystem = strdup(_subsystem); | |
754 | if (!subsystem) | |
755 | return -ENOMEM; | |
756 | ||
757 | r = device_set_subsystem(device, "drivers"); | |
758 | if (r < 0) | |
759 | return r; | |
760 | ||
f9ecfd3b | 761 | free_and_replace(device->driver_subsystem, subsystem); |
de7e983e TG |
762 | |
763 | return 0; | |
764 | } | |
765 | ||
57fa1d09 | 766 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
767 | const char *syspath, *drivers = NULL; |
768 | int r; | |
769 | ||
57fa1d09 TG |
770 | assert_return(ret, -EINVAL); |
771 | assert_return(device, -EINVAL); | |
772 | ||
de7e983e TG |
773 | r = sd_device_get_syspath(device, &syspath); |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
57fa1d09 TG |
777 | if (!device->subsystem_set) { |
778 | _cleanup_free_ char *subsystem = NULL; | |
57fa1d09 | 779 | char *path; |
57fa1d09 TG |
780 | |
781 | /* read 'subsystem' link */ | |
57fa1d09 TG |
782 | path = strjoina(syspath, "/subsystem"); |
783 | r = readlink_value(path, &subsystem); | |
784 | if (r >= 0) | |
785 | r = device_set_subsystem(device, subsystem); | |
786 | /* use implicit names */ | |
787 | else if (path_startswith(device->devpath, "/module/")) | |
788 | r = device_set_subsystem(device, "module"); | |
de7e983e TG |
789 | else if (!(drivers = strstr(syspath, "/drivers/")) && |
790 | (path_startswith(device->devpath, "/subsystem/") || | |
791 | path_startswith(device->devpath, "/class/") || | |
792 | path_startswith(device->devpath, "/bus/"))) | |
57fa1d09 | 793 | r = device_set_subsystem(device, "subsystem"); |
4189708a | 794 | if (r < 0 && r != -ENOENT) |
5a917c06 | 795 | return log_debug_errno(r, "sd-device: could not set subsystem for %s: %m", device->devpath); |
57fa1d09 TG |
796 | |
797 | device->subsystem_set = true; | |
de7e983e TG |
798 | } else if (!device->driver_subsystem_set) |
799 | drivers = strstr(syspath, "/drivers/"); | |
800 | ||
801 | if (!device->driver_subsystem_set) { | |
802 | if (drivers) { | |
803 | _cleanup_free_ char *subpath = NULL; | |
804 | ||
805 | subpath = strndup(syspath, drivers - syspath); | |
806 | if (!subpath) | |
807 | r = -ENOMEM; | |
808 | else { | |
809 | const char *subsys; | |
810 | ||
811 | subsys = strrchr(subpath, '/'); | |
812 | if (!subsys) | |
813 | r = -EINVAL; | |
814 | else | |
815 | r = device_set_drivers_subsystem(device, subsys + 1); | |
816 | } | |
817 | if (r < 0 && r != -ENOENT) | |
818 | return log_debug_errno(r, "sd-device: could not set subsystem for driver %s: %m", device->devpath); | |
819 | } | |
820 | ||
821 | device->driver_subsystem_set = true; | |
57fa1d09 TG |
822 | } |
823 | ||
bf4c113e DH |
824 | if (!device->subsystem) |
825 | return -ENOENT; | |
826 | ||
57fa1d09 TG |
827 | *ret = device->subsystem; |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
833 | int r; | |
834 | ||
835 | assert(devtype); | |
836 | assert(device); | |
837 | ||
838 | r = device_read_uevent_file(device); | |
839 | if (r < 0) | |
840 | return r; | |
841 | ||
842 | *devtype = device->devtype; | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
848 | sd_device *parent = NULL; | |
849 | int r; | |
850 | ||
851 | assert_return(child, -EINVAL); | |
852 | assert_return(subsystem, -EINVAL); | |
853 | ||
854 | r = sd_device_get_parent(child, &parent); | |
855 | while (r >= 0) { | |
856 | const char *parent_subsystem = NULL; | |
857 | const char *parent_devtype = NULL; | |
858 | ||
db2f8a2e | 859 | (void) sd_device_get_subsystem(parent, &parent_subsystem); |
57fa1d09 TG |
860 | if (streq_ptr(parent_subsystem, subsystem)) { |
861 | if (!devtype) | |
862 | break; | |
863 | ||
db2f8a2e | 864 | (void) sd_device_get_devtype(parent, &parent_devtype); |
57fa1d09 TG |
865 | if (streq_ptr(parent_devtype, devtype)) |
866 | break; | |
867 | } | |
868 | r = sd_device_get_parent(parent, &parent); | |
869 | } | |
870 | ||
871 | if (r < 0) | |
872 | return r; | |
873 | ||
874 | *ret = parent; | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
880 | int r; | |
881 | ||
882 | assert_return(device, -EINVAL); | |
883 | assert_return(devnum, -EINVAL); | |
884 | ||
885 | r = device_read_uevent_file(device); | |
886 | if (r < 0) | |
887 | return r; | |
888 | ||
889 | *devnum = device->devnum; | |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | int device_set_driver(sd_device *device, const char *_driver) { | |
895 | _cleanup_free_ char *driver = NULL; | |
896 | int r; | |
897 | ||
898 | assert(device); | |
899 | assert(_driver); | |
900 | ||
901 | driver = strdup(_driver); | |
902 | if (!driver) | |
903 | return -ENOMEM; | |
904 | ||
905 | r = device_add_property_internal(device, "DRIVER", driver); | |
906 | if (r < 0) | |
907 | return r; | |
908 | ||
f9ecfd3b | 909 | free_and_replace(device->driver, driver); |
57fa1d09 TG |
910 | |
911 | device->driver_set = true; | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
917 | assert_return(device, -EINVAL); | |
918 | assert_return(ret, -EINVAL); | |
919 | ||
920 | if (!device->driver_set) { | |
921 | _cleanup_free_ char *driver = NULL; | |
922 | const char *syspath; | |
923 | char *path; | |
924 | int r; | |
925 | ||
926 | r = sd_device_get_syspath(device, &syspath); | |
927 | if (r < 0) | |
928 | return r; | |
929 | ||
930 | path = strjoina(syspath, "/driver"); | |
931 | r = readlink_value(path, &driver); | |
932 | if (r >= 0) { | |
933 | r = device_set_driver(device, driver); | |
934 | if (r < 0) | |
7283a80d TG |
935 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); |
936 | } else if (r == -ENOENT) | |
937 | device->driver_set = true; | |
938 | else | |
939 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); | |
57fa1d09 TG |
940 | } |
941 | ||
bf4c113e DH |
942 | if (!device->driver) |
943 | return -ENOENT; | |
944 | ||
57fa1d09 TG |
945 | *ret = device->driver; |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | _public_ int sd_device_get_devpath(sd_device *device, const char **devpath) { | |
951 | assert_return(device, -EINVAL); | |
952 | assert_return(devpath, -EINVAL); | |
953 | ||
954 | assert(device->devpath); | |
955 | assert(device->devpath[0] == '/'); | |
956 | ||
957 | *devpath = device->devpath; | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
963 | int r; | |
964 | ||
965 | assert_return(device, -EINVAL); | |
966 | assert_return(devname, -EINVAL); | |
967 | ||
968 | r = device_read_uevent_file(device); | |
969 | if (r < 0) | |
970 | return r; | |
971 | ||
972 | if (!device->devname) | |
973 | return -ENOENT; | |
974 | ||
975 | assert(path_startswith(device->devname, "/dev/")); | |
976 | ||
977 | *devname = device->devname; | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | static int device_set_sysname(sd_device *device) { | |
983 | _cleanup_free_ char *sysname = NULL; | |
afcac065 | 984 | const char *sysnum = NULL; |
57fa1d09 TG |
985 | const char *pos; |
986 | size_t len = 0; | |
987 | ||
988 | pos = strrchr(device->devpath, '/'); | |
989 | if (!pos) | |
990 | return -EINVAL; | |
313cefa1 | 991 | pos++; |
57fa1d09 TG |
992 | |
993 | /* devpath is not a root directory */ | |
994 | if (*pos == '\0' || pos <= device->devpath) | |
995 | return -EINVAL; | |
996 | ||
997 | sysname = strdup(pos); | |
998 | if (!sysname) | |
999 | return -ENOMEM; | |
1000 | ||
1001 | /* some devices have '!' in their name, change that to '/' */ | |
1002 | while (sysname[len] != '\0') { | |
1003 | if (sysname[len] == '!') | |
1004 | sysname[len] = '/'; | |
1005 | ||
313cefa1 | 1006 | len++; |
57fa1d09 TG |
1007 | } |
1008 | ||
1009 | /* trailing number */ | |
1010 | while (len > 0 && isdigit(sysname[--len])) | |
1011 | sysnum = &sysname[len]; | |
1012 | ||
1013 | if (len == 0) | |
1014 | sysnum = NULL; | |
1015 | ||
f9ecfd3b | 1016 | free_and_replace(device->sysname, sysname); |
57fa1d09 TG |
1017 | |
1018 | device->sysnum = sysnum; | |
1019 | ||
1020 | device->sysname_set = true; | |
1021 | ||
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1026 | int r; | |
1027 | ||
1028 | assert_return(device, -EINVAL); | |
1029 | assert_return(ret, -EINVAL); | |
1030 | ||
1031 | if (!device->sysname_set) { | |
1032 | r = device_set_sysname(device); | |
1033 | if (r < 0) | |
1034 | return r; | |
1035 | } | |
1036 | ||
bf4c113e DH |
1037 | assert_return(device->sysname, -ENOENT); |
1038 | ||
57fa1d09 TG |
1039 | *ret = device->sysname; |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1045 | int r; | |
1046 | ||
1047 | assert_return(device, -EINVAL); | |
1048 | assert_return(ret, -EINVAL); | |
1049 | ||
1050 | if (!device->sysname_set) { | |
1051 | r = device_set_sysname(device); | |
1052 | if (r < 0) | |
1053 | return r; | |
1054 | } | |
1055 | ||
1056 | *ret = device->sysnum; | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static bool is_valid_tag(const char *tag) { | |
1062 | assert(tag); | |
1063 | ||
1064 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1065 | } | |
1066 | ||
1067 | int device_add_tag(sd_device *device, const char *tag) { | |
1068 | int r; | |
1069 | ||
1070 | assert(device); | |
1071 | assert(tag); | |
1072 | ||
1073 | if (!is_valid_tag(tag)) | |
1074 | return -EINVAL; | |
1075 | ||
1076 | r = set_ensure_allocated(&device->tags, &string_hash_ops); | |
1077 | if (r < 0) | |
1078 | return r; | |
1079 | ||
1080 | r = set_put_strdup(device->tags, tag); | |
1081 | if (r < 0) | |
1082 | return r; | |
1083 | ||
313cefa1 | 1084 | device->tags_generation++; |
57fa1d09 TG |
1085 | device->property_tags_outdated = true; |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | int device_add_devlink(sd_device *device, const char *devlink) { | |
1091 | int r; | |
1092 | ||
1093 | assert(device); | |
1094 | assert(devlink); | |
1095 | ||
1096 | r = set_ensure_allocated(&device->devlinks, &string_hash_ops); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | ||
1100 | r = set_put_strdup(device->devlinks, devlink); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
313cefa1 | 1104 | device->devlinks_generation++; |
57fa1d09 TG |
1105 | device->property_devlinks_outdated = true; |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { | |
1111 | _cleanup_free_ char *key = NULL; | |
1112 | char *value; | |
1113 | ||
1114 | assert(device); | |
1115 | assert(str); | |
1116 | ||
1117 | key = strdup(str); | |
1118 | if (!key) | |
1119 | return -ENOMEM; | |
1120 | ||
1121 | value = strchr(key, '='); | |
1122 | if (!value) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | *value = '\0'; | |
1126 | ||
1127 | if (isempty(++value)) | |
1128 | value = NULL; | |
1129 | ||
1130 | return device_add_property_internal(device, key, value); | |
1131 | } | |
1132 | ||
1133 | int device_set_usec_initialized(sd_device *device, const char *initialized) { | |
1134 | uint64_t usec_initialized; | |
1135 | int r; | |
1136 | ||
1137 | assert(device); | |
1138 | assert(initialized); | |
1139 | ||
1140 | r = safe_atou64(initialized, &usec_initialized); | |
1141 | if (r < 0) | |
1142 | return r; | |
1143 | ||
1144 | r = device_add_property_internal(device, "USEC_INITIALIZED", initialized); | |
1145 | if (r < 0) | |
1146 | return r; | |
1147 | ||
1148 | device->usec_initialized = usec_initialized; | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
1154 | char *path; | |
1155 | int r; | |
1156 | ||
1157 | assert(device); | |
1158 | assert(value); | |
1159 | ||
1160 | switch (key) { | |
1161 | case 'G': | |
1162 | r = device_add_tag(device, value); | |
1163 | if (r < 0) | |
1164 | return r; | |
1165 | ||
1166 | break; | |
1167 | case 'S': | |
1168 | path = strjoina("/dev/", value); | |
1169 | r = device_add_devlink(device, path); | |
1170 | if (r < 0) | |
1171 | return r; | |
1172 | ||
1173 | break; | |
1174 | case 'E': | |
1175 | r = device_add_property_internal_from_string(device, value); | |
1176 | if (r < 0) | |
1177 | return r; | |
1178 | ||
1179 | break; | |
1180 | case 'I': | |
1181 | r = device_set_usec_initialized(device, value); | |
1182 | if (r < 0) | |
1183 | return r; | |
1184 | ||
1185 | break; | |
1186 | case 'L': | |
1187 | r = safe_atoi(value, &device->devlink_priority); | |
1188 | if (r < 0) | |
1189 | return r; | |
1190 | ||
1191 | break; | |
1192 | case 'W': | |
1193 | r = safe_atoi(value, &device->watch_handle); | |
1194 | if (r < 0) | |
1195 | return r; | |
1196 | ||
1197 | break; | |
1198 | default: | |
1199 | log_debug("device db: unknown key '%c'", key); | |
1200 | } | |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | int device_get_id_filename(sd_device *device, const char **ret) { | |
1206 | assert(device); | |
1207 | assert(ret); | |
1208 | ||
1209 | if (!device->id_filename) { | |
1210 | _cleanup_free_ char *id = NULL; | |
1211 | const char *subsystem; | |
1212 | dev_t devnum; | |
1213 | int ifindex, r; | |
1214 | ||
1215 | r = sd_device_get_subsystem(device, &subsystem); | |
1216 | if (r < 0) | |
1217 | return r; | |
1218 | ||
1219 | r = sd_device_get_devnum(device, &devnum); | |
1220 | if (r < 0) | |
1221 | return r; | |
1222 | ||
1223 | r = sd_device_get_ifindex(device, &ifindex); | |
1224 | if (r < 0) | |
1225 | return r; | |
1226 | ||
1227 | if (major(devnum) > 0) { | |
4189708a TG |
1228 | assert(subsystem); |
1229 | ||
ccddd104 | 1230 | /* use dev_t — b259:131072, c254:0 */ |
57fa1d09 TG |
1231 | r = asprintf(&id, "%c%u:%u", |
1232 | streq(subsystem, "block") ? 'b' : 'c', | |
1233 | major(devnum), minor(devnum)); | |
1234 | if (r < 0) | |
53fae771 | 1235 | return -ENOMEM; |
57fa1d09 | 1236 | } else if (ifindex > 0) { |
ccddd104 | 1237 | /* use netdev ifindex — n3 */ |
57fa1d09 TG |
1238 | r = asprintf(&id, "n%u", ifindex); |
1239 | if (r < 0) | |
53fae771 | 1240 | return -ENOMEM; |
57fa1d09 | 1241 | } else { |
ccddd104 | 1242 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
57fa1d09 TG |
1243 | * sysname() has '!' translated, get it from devpath |
1244 | */ | |
1245 | const char *sysname; | |
1246 | ||
1247 | sysname = basename(device->devpath); | |
1248 | if (!sysname) | |
4189708a TG |
1249 | return -EINVAL; |
1250 | ||
1251 | if (!subsystem) | |
57fa1d09 TG |
1252 | return -EINVAL; |
1253 | ||
de7e983e TG |
1254 | if (streq(subsystem, "drivers")) { |
1255 | /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem | |
1256 | * encoded as well */ | |
1257 | r = asprintf(&id, "+drivers:%s:%s", device->driver_subsystem, sysname); | |
1258 | if (r < 0) | |
1259 | return -ENOMEM; | |
1260 | } else { | |
1261 | r = asprintf(&id, "+%s:%s", subsystem, sysname); | |
1262 | if (r < 0) | |
1263 | return -ENOMEM; | |
1264 | } | |
57fa1d09 TG |
1265 | } |
1266 | ||
ae2a15bc | 1267 | device->id_filename = TAKE_PTR(id); |
57fa1d09 TG |
1268 | } |
1269 | ||
1270 | *ret = device->id_filename; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
107f2e25 | 1275 | int device_read_db_aux(sd_device *device, bool force) { |
57fa1d09 TG |
1276 | _cleanup_free_ char *db = NULL; |
1277 | char *path; | |
1278 | const char *id, *value; | |
1279 | char key; | |
1280 | size_t db_len; | |
1281 | unsigned i; | |
1282 | int r; | |
1283 | ||
1284 | enum { | |
1285 | PRE_KEY, | |
1286 | KEY, | |
1287 | PRE_VALUE, | |
1288 | VALUE, | |
1289 | INVALID_LINE, | |
1290 | } state = PRE_KEY; | |
1291 | ||
107f2e25 | 1292 | if (device->db_loaded || (!force && device->sealed)) |
57fa1d09 TG |
1293 | return 0; |
1294 | ||
7141e4f6 TG |
1295 | device->db_loaded = true; |
1296 | ||
57fa1d09 TG |
1297 | r = device_get_id_filename(device, &id); |
1298 | if (r < 0) | |
1299 | return r; | |
1300 | ||
1301 | path = strjoina("/run/udev/data/", id); | |
1302 | ||
1303 | r = read_full_file(path, &db, &db_len); | |
1304 | if (r < 0) { | |
1305 | if (r == -ENOENT) | |
1306 | return 0; | |
e53fc357 LP |
1307 | else |
1308 | return log_debug_errno(r, "sd-device: failed to read db '%s': %m", path); | |
57fa1d09 TG |
1309 | } |
1310 | ||
1311 | /* devices with a database entry are initialized */ | |
7e518afa | 1312 | device->is_initialized = true; |
57fa1d09 TG |
1313 | |
1314 | for (i = 0; i < db_len; i++) { | |
1315 | switch (state) { | |
1316 | case PRE_KEY: | |
1317 | if (!strchr(NEWLINE, db[i])) { | |
1318 | key = db[i]; | |
1319 | ||
1320 | state = KEY; | |
1321 | } | |
1322 | ||
1323 | break; | |
1324 | case KEY: | |
1325 | if (db[i] != ':') { | |
1326 | log_debug("sd-device: ignoring invalid db entry with key '%c'", key); | |
1327 | ||
1328 | state = INVALID_LINE; | |
1329 | } else { | |
1330 | db[i] = '\0'; | |
1331 | ||
1332 | state = PRE_VALUE; | |
1333 | } | |
1334 | ||
1335 | break; | |
1336 | case PRE_VALUE: | |
1337 | value = &db[i]; | |
1338 | ||
1339 | state = VALUE; | |
1340 | ||
1341 | break; | |
1342 | case INVALID_LINE: | |
1343 | if (strchr(NEWLINE, db[i])) | |
1344 | state = PRE_KEY; | |
1345 | ||
1346 | break; | |
1347 | case VALUE: | |
1348 | if (strchr(NEWLINE, db[i])) { | |
1349 | db[i] = '\0'; | |
1350 | r = handle_db_line(device, key, value); | |
1351 | if (r < 0) | |
19c29853 | 1352 | log_debug_errno(r, "sd-device: failed to handle db entry '%c:%s': %m", key, value); |
57fa1d09 TG |
1353 | |
1354 | state = PRE_KEY; | |
1355 | } | |
1356 | ||
1357 | break; | |
1358 | default: | |
1359 | assert_not_reached("invalid state when parsing db"); | |
1360 | } | |
1361 | } | |
1362 | ||
57fa1d09 TG |
1363 | return 0; |
1364 | } | |
1365 | ||
107f2e25 TG |
1366 | static int device_read_db(sd_device *device) { |
1367 | return device_read_db_aux(device, false); | |
1368 | } | |
1369 | ||
57fa1d09 TG |
1370 | _public_ int sd_device_get_is_initialized(sd_device *device, int *initialized) { |
1371 | int r; | |
1372 | ||
1373 | assert_return(device, -EINVAL); | |
1374 | assert_return(initialized, -EINVAL); | |
1375 | ||
1376 | r = device_read_db(device); | |
1377 | if (r < 0) | |
1378 | return r; | |
1379 | ||
1380 | *initialized = device->is_initialized; | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) { | |
1386 | usec_t now_ts; | |
1387 | int r; | |
1388 | ||
1389 | assert_return(device, -EINVAL); | |
1390 | assert_return(usec, -EINVAL); | |
1391 | ||
1392 | r = device_read_db(device); | |
1393 | if (r < 0) | |
1394 | return r; | |
1395 | ||
1396 | if (!device->is_initialized) | |
1397 | return -EBUSY; | |
1398 | ||
1399 | if (!device->usec_initialized) | |
1400 | return -ENODATA; | |
1401 | ||
1402 | now_ts = now(clock_boottime_or_monotonic()); | |
1403 | ||
1404 | if (now_ts < device->usec_initialized) | |
1405 | return -EIO; | |
1406 | ||
1407 | *usec = now_ts - device->usec_initialized; | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1413 | void *v; |
1414 | ||
57fa1d09 TG |
1415 | assert_return(device, NULL); |
1416 | ||
1417 | (void) device_read_db(device); | |
1418 | ||
1419 | device->tags_iterator_generation = device->tags_generation; | |
1420 | device->tags_iterator = ITERATOR_FIRST; | |
1421 | ||
bccfe92e | 1422 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1423 | return v; |
57fa1d09 TG |
1424 | } |
1425 | ||
1426 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1427 | void *v; |
1428 | ||
57fa1d09 TG |
1429 | assert_return(device, NULL); |
1430 | ||
1431 | (void) device_read_db(device); | |
1432 | ||
1433 | if (device->tags_iterator_generation != device->tags_generation) | |
1434 | return NULL; | |
1435 | ||
bccfe92e | 1436 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1437 | return v; |
57fa1d09 TG |
1438 | } |
1439 | ||
1440 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1441 | void *v; |
1442 | ||
57fa1d09 TG |
1443 | assert_return(device, NULL); |
1444 | ||
1445 | (void) device_read_db(device); | |
1446 | ||
1447 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1448 | device->devlinks_iterator = ITERATOR_FIRST; | |
1449 | ||
bccfe92e | 1450 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1451 | return v; |
57fa1d09 TG |
1452 | } |
1453 | ||
1454 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1455 | void *v; |
1456 | ||
57fa1d09 TG |
1457 | assert_return(device, NULL); |
1458 | ||
1459 | (void) device_read_db(device); | |
1460 | ||
1461 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1462 | return NULL; | |
1463 | ||
bccfe92e | 1464 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1465 | return v; |
57fa1d09 TG |
1466 | } |
1467 | ||
1468 | static int device_properties_prepare(sd_device *device) { | |
1469 | int r; | |
1470 | ||
1471 | assert(device); | |
1472 | ||
1473 | r = device_read_uevent_file(device); | |
1474 | if (r < 0) | |
1475 | return r; | |
1476 | ||
1477 | r = device_read_db(device); | |
1478 | if (r < 0) | |
1479 | return r; | |
1480 | ||
1481 | if (device->property_devlinks_outdated) { | |
1d88a271 MP |
1482 | _cleanup_free_ char *devlinks = NULL; |
1483 | size_t devlinks_allocated = 0, devlinks_len = 0; | |
57fa1d09 TG |
1484 | const char *devlink; |
1485 | ||
1d88a271 MP |
1486 | for (devlink = sd_device_get_devlink_first(device); devlink; devlink = sd_device_get_devlink_next(device)) { |
1487 | char *e; | |
57fa1d09 | 1488 | |
1d88a271 MP |
1489 | if (!GREEDY_REALLOC(devlinks, devlinks_allocated, devlinks_len + strlen(devlink) + 2)) |
1490 | return -ENOMEM; | |
1491 | if (devlinks_len > 0) | |
1492 | stpcpy(devlinks + devlinks_len++, " "); | |
1493 | e = stpcpy(devlinks + devlinks_len, devlink); | |
1494 | devlinks_len = e - devlinks; | |
1495 | } | |
57fa1d09 TG |
1496 | |
1497 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1498 | if (r < 0) | |
1499 | return r; | |
1500 | ||
1501 | device->property_devlinks_outdated = false; | |
1502 | } | |
1503 | ||
1504 | if (device->property_tags_outdated) { | |
1d88a271 MP |
1505 | _cleanup_free_ char *tags = NULL; |
1506 | size_t tags_allocated = 0, tags_len = 0; | |
57fa1d09 TG |
1507 | const char *tag; |
1508 | ||
1d88a271 MP |
1509 | if (!GREEDY_REALLOC(tags, tags_allocated, 2)) |
1510 | return -ENOMEM; | |
1511 | stpcpy(tags, ":"); | |
1512 | tags_len++; | |
57fa1d09 | 1513 | |
1d88a271 MP |
1514 | for (tag = sd_device_get_tag_first(device); tag; tag = sd_device_get_tag_next(device)) { |
1515 | char *e; | |
57fa1d09 | 1516 | |
817ec8cc | 1517 | if (!GREEDY_REALLOC(tags, tags_allocated, tags_len + strlen(tag) + 2)) |
1d88a271 MP |
1518 | return -ENOMEM; |
1519 | e = stpcpy(stpcpy(tags + tags_len, tag), ":"); | |
1520 | tags_len = e - tags; | |
1521 | } | |
57fa1d09 TG |
1522 | |
1523 | r = device_add_property_internal(device, "TAGS", tags); | |
1524 | if (r < 0) | |
1525 | return r; | |
1526 | ||
1527 | device->property_tags_outdated = false; | |
1528 | } | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
1534 | const char *key; | |
1535 | const char *value; | |
1536 | int r; | |
1537 | ||
1538 | assert_return(device, NULL); | |
1539 | ||
1540 | r = device_properties_prepare(device); | |
1541 | if (r < 0) | |
1542 | return NULL; | |
1543 | ||
1544 | device->properties_iterator_generation = device->properties_generation; | |
1545 | device->properties_iterator = ITERATOR_FIRST; | |
1546 | ||
8927b1da | 1547 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1548 | |
1549 | if (_value) | |
1550 | *_value = value; | |
1551 | ||
1552 | return key; | |
1553 | } | |
1554 | ||
1555 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
1556 | const char *key; | |
1557 | const char *value; | |
1558 | int r; | |
1559 | ||
1560 | assert_return(device, NULL); | |
1561 | ||
1562 | r = device_properties_prepare(device); | |
1563 | if (r < 0) | |
1564 | return NULL; | |
1565 | ||
1566 | if (device->properties_iterator_generation != device->properties_generation) | |
1567 | return NULL; | |
1568 | ||
8927b1da | 1569 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1570 | |
1571 | if (_value) | |
1572 | *_value = value; | |
1573 | ||
1574 | return key; | |
1575 | } | |
1576 | ||
1577 | static int device_sysattrs_read_all(sd_device *device) { | |
1578 | _cleanup_closedir_ DIR *dir = NULL; | |
1579 | const char *syspath; | |
1580 | struct dirent *dent; | |
1581 | int r; | |
1582 | ||
1583 | assert(device); | |
1584 | ||
1585 | if (device->sysattrs_read) | |
1586 | return 0; | |
1587 | ||
1588 | r = sd_device_get_syspath(device, &syspath); | |
1589 | if (r < 0) | |
1590 | return r; | |
1591 | ||
1592 | dir = opendir(syspath); | |
1593 | if (!dir) | |
1594 | return -errno; | |
1595 | ||
1596 | r = set_ensure_allocated(&device->sysattrs, &string_hash_ops); | |
1597 | if (r < 0) | |
1598 | return r; | |
1599 | ||
8fb3f009 | 1600 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
57fa1d09 TG |
1601 | char *path; |
1602 | struct stat statbuf; | |
1603 | ||
1604 | /* only handle symlinks and regular files */ | |
945c2931 | 1605 | if (!IN_SET(dent->d_type, DT_LNK, DT_REG)) |
57fa1d09 TG |
1606 | continue; |
1607 | ||
1608 | path = strjoina(syspath, "/", dent->d_name); | |
1609 | ||
1610 | if (lstat(path, &statbuf) != 0) | |
1611 | continue; | |
1612 | ||
1613 | if (!(statbuf.st_mode & S_IRUSR)) | |
1614 | continue; | |
1615 | ||
1616 | r = set_put_strdup(device->sysattrs, dent->d_name); | |
1617 | if (r < 0) | |
1618 | return r; | |
1619 | } | |
1620 | ||
1621 | device->sysattrs_read = true; | |
1622 | ||
1623 | return 0; | |
1624 | } | |
1625 | ||
1626 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 1627 | void *v; |
57fa1d09 TG |
1628 | int r; |
1629 | ||
1630 | assert_return(device, NULL); | |
1631 | ||
1632 | if (!device->sysattrs_read) { | |
1633 | r = device_sysattrs_read_all(device); | |
1634 | if (r < 0) { | |
1635 | errno = -r; | |
1636 | return NULL; | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | device->sysattrs_iterator = ITERATOR_FIRST; | |
1641 | ||
bccfe92e | 1642 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1643 | return v; |
57fa1d09 TG |
1644 | } |
1645 | ||
1646 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
1647 | void *v; |
1648 | ||
57fa1d09 TG |
1649 | assert_return(device, NULL); |
1650 | ||
1651 | if (!device->sysattrs_read) | |
1652 | return NULL; | |
1653 | ||
bccfe92e | 1654 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1655 | return v; |
57fa1d09 TG |
1656 | } |
1657 | ||
1658 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
1659 | assert_return(device, -EINVAL); | |
1660 | assert_return(tag, -EINVAL); | |
1661 | ||
1662 | (void) device_read_db(device); | |
1663 | ||
1664 | return !!set_contains(device->tags, tag); | |
1665 | } | |
1666 | ||
1667 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) { | |
1668 | char *value; | |
1669 | int r; | |
1670 | ||
1671 | assert_return(device, -EINVAL); | |
1672 | assert_return(key, -EINVAL); | |
1673 | assert_return(_value, -EINVAL); | |
1674 | ||
1675 | r = device_properties_prepare(device); | |
1676 | if (r < 0) | |
1677 | return r; | |
1678 | ||
1679 | value = ordered_hashmap_get(device->properties, key); | |
1680 | if (!value) | |
1681 | return -ENOENT; | |
1682 | ||
1683 | *_value = value; | |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
1688 | /* replaces the value if it already exists */ | |
2fe29a46 | 1689 | static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) { |
57fa1d09 | 1690 | _cleanup_free_ char *key = NULL; |
2fe29a46 | 1691 | _cleanup_free_ char *value_old = NULL; |
57fa1d09 TG |
1692 | int r; |
1693 | ||
1694 | assert(device); | |
1695 | assert(_key); | |
1696 | ||
1697 | r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops); | |
1698 | if (r < 0) | |
1699 | return r; | |
1700 | ||
2fe29a46 | 1701 | value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key); |
57fa1d09 TG |
1702 | if (!key) { |
1703 | key = strdup(_key); | |
1704 | if (!key) | |
1705 | return -ENOMEM; | |
1706 | } | |
1707 | ||
57fa1d09 TG |
1708 | r = hashmap_put(device->sysattr_values, key, value); |
1709 | if (r < 0) | |
1710 | return r; | |
1711 | ||
1712 | key = NULL; | |
57fa1d09 TG |
1713 | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) { | |
1718 | const char *key = NULL, *value; | |
1719 | ||
1720 | assert(device); | |
1721 | assert(_key); | |
1722 | ||
1723 | value = hashmap_get2(device->sysattr_values, _key, (void **) &key); | |
1724 | if (!key) | |
1725 | return -ENOENT; | |
1726 | ||
1727 | if (_value) | |
1728 | *_value = value; | |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
1734 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
1735 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) { | |
1736 | _cleanup_free_ char *value = NULL; | |
1737 | const char *syspath, *cached_value = NULL; | |
1738 | char *path; | |
1739 | struct stat statbuf; | |
1740 | int r; | |
1741 | ||
1742 | assert_return(device, -EINVAL); | |
1743 | assert_return(sysattr, -EINVAL); | |
1744 | ||
1745 | /* look for possibly already cached result */ | |
1746 | r = device_get_sysattr_value(device, sysattr, &cached_value); | |
1747 | if (r != -ENOENT) { | |
1748 | if (r < 0) | |
1749 | return r; | |
1750 | ||
1751 | if (!cached_value) | |
1752 | /* we looked up the sysattr before and it did not exist */ | |
1753 | return -ENOENT; | |
1754 | ||
1755 | if (_value) | |
1756 | *_value = cached_value; | |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | r = sd_device_get_syspath(device, &syspath); | |
1762 | if (r < 0) | |
1763 | return r; | |
1764 | ||
1765 | path = strjoina(syspath, "/", sysattr); | |
1766 | r = lstat(path, &statbuf); | |
1767 | if (r < 0) { | |
1768 | /* remember that we could not access the sysattr */ | |
1769 | r = device_add_sysattr_value(device, sysattr, NULL); | |
1770 | if (r < 0) | |
1771 | return r; | |
1772 | ||
1773 | return -ENOENT; | |
1774 | } else if (S_ISLNK(statbuf.st_mode)) { | |
1775 | /* Some core links return only the last element of the target path, | |
1776 | * these are just values, the paths should not be exposed. */ | |
1777 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
1778 | r = readlink_value(path, &value); | |
1779 | if (r < 0) | |
1780 | return r; | |
1781 | } else | |
1782 | return -EINVAL; | |
1783 | } else if (S_ISDIR(statbuf.st_mode)) { | |
1784 | /* skip directories */ | |
1785 | return -EINVAL; | |
1786 | } else if (!(statbuf.st_mode & S_IRUSR)) { | |
1787 | /* skip non-readable files */ | |
1788 | return -EPERM; | |
1789 | } else { | |
1790 | size_t size; | |
1791 | ||
1792 | /* read attribute value */ | |
1793 | r = read_full_file(path, &value, &size); | |
1794 | if (r < 0) | |
1795 | return r; | |
1796 | ||
1797 | /* drop trailing newlines */ | |
1798 | while (size > 0 && value[--size] == '\n') | |
1799 | value[size] = '\0'; | |
1800 | } | |
1801 | ||
1802 | r = device_add_sysattr_value(device, sysattr, value); | |
1803 | if (r < 0) | |
1804 | return r; | |
1805 | ||
1cc6c93a | 1806 | *_value = TAKE_PTR(value); |
57fa1d09 TG |
1807 | |
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | static void device_remove_sysattr_value(sd_device *device, const char *_key) { | |
1812 | _cleanup_free_ char *key = NULL; | |
1813 | _cleanup_free_ char *value = NULL; | |
1814 | ||
1815 | assert(device); | |
1816 | assert(_key); | |
1817 | ||
1818 | value = hashmap_remove2(device->sysattr_values, _key, (void **) &key); | |
1819 | ||
1820 | return; | |
1821 | } | |
1822 | ||
1823 | /* set the attribute and save it in the cache. If a NULL value is passed the | |
1824 | * attribute is cleared from the cache */ | |
8aae9a66 | 1825 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, const char *_value) { |
57fa1d09 | 1826 | _cleanup_close_ int fd = -1; |
2fe29a46 | 1827 | _cleanup_free_ char *value = NULL; |
57fa1d09 TG |
1828 | const char *syspath; |
1829 | char *path; | |
2fa4861a | 1830 | size_t len = 0; |
57fa1d09 TG |
1831 | ssize_t size; |
1832 | int r; | |
1833 | ||
1834 | assert_return(device, -EINVAL); | |
1835 | assert_return(sysattr, -EINVAL); | |
1836 | ||
2fe29a46 | 1837 | if (!_value) { |
57fa1d09 TG |
1838 | device_remove_sysattr_value(device, sysattr); |
1839 | ||
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | r = sd_device_get_syspath(device, &syspath); | |
1844 | if (r < 0) | |
1845 | return r; | |
1846 | ||
1847 | path = strjoina(syspath, "/", sysattr); | |
2fa4861a ZJS |
1848 | |
1849 | fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); | |
1850 | if (fd < 0) { | |
1851 | if (errno == ELOOP) | |
1852 | return -EINVAL; | |
1853 | if (errno == EISDIR) | |
1854 | return -EISDIR; | |
1855 | ||
2fe29a46 TG |
1856 | value = strdup(""); |
1857 | if (!value) | |
1858 | return -ENOMEM; | |
1859 | ||
1860 | r = device_add_sysattr_value(device, sysattr, value); | |
57fa1d09 TG |
1861 | if (r < 0) |
1862 | return r; | |
3bd82598 | 1863 | value = NULL; |
57fa1d09 TG |
1864 | |
1865 | return -ENXIO; | |
1866 | } | |
1867 | ||
2fa4861a | 1868 | len = strlen(_value); |
57fa1d09 TG |
1869 | |
1870 | /* drop trailing newlines */ | |
2fa4861a ZJS |
1871 | while (len > 0 && _value[len - 1] == '\n') |
1872 | len --; | |
57fa1d09 TG |
1873 | |
1874 | /* value length is limited to 4k */ | |
2fa4861a | 1875 | if (len > 4096) |
57fa1d09 TG |
1876 | return -EINVAL; |
1877 | ||
2fa4861a | 1878 | value = strndup(_value, len); |
2fe29a46 TG |
1879 | if (!value) |
1880 | return -ENOMEM; | |
1881 | ||
2fa4861a | 1882 | size = write(fd, value, len); |
57fa1d09 TG |
1883 | if (size < 0) |
1884 | return -errno; | |
1885 | ||
2fa4861a | 1886 | if ((size_t)size != len) |
57fa1d09 TG |
1887 | return -EIO; |
1888 | ||
1889 | r = device_add_sysattr_value(device, sysattr, value); | |
1890 | if (r < 0) | |
1891 | return r; | |
2fe29a46 TG |
1892 | value = NULL; |
1893 | ||
57fa1d09 TG |
1894 | return 0; |
1895 | } |