]>
Commit | Line | Data |
---|---|---|
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, | |
dcfbde3a YW |
41 | .ifindex = -1, |
42 | .devmode = (mode_t) -1, | |
43 | .devuid = (uid_t) -1, | |
44 | .devgid = (gid_t) -1, | |
6116d2b2 | 45 | }; |
57fa1d09 TG |
46 | |
47 | *ret = device; | |
57fa1d09 TG |
48 | return 0; |
49 | } | |
50 | ||
8301aa0b YW |
51 | static sd_device *device_free(sd_device *device) { |
52 | assert(device); | |
57fa1d09 | 53 | |
8301aa0b YW |
54 | sd_device_unref(device->parent); |
55 | free(device->syspath); | |
56 | free(device->sysname); | |
57 | free(device->devtype); | |
58 | free(device->devname); | |
59 | free(device->subsystem); | |
60 | free(device->driver_subsystem); | |
61 | free(device->driver); | |
62 | free(device->id_filename); | |
63 | free(device->properties_strv); | |
64 | free(device->properties_nulstr); | |
65 | ||
66 | ordered_hashmap_free_free_free(device->properties); | |
67 | ordered_hashmap_free_free_free(device->properties_db); | |
68 | hashmap_free_free_free(device->sysattr_values); | |
69 | set_free_free(device->sysattrs); | |
70 | set_free_free(device->tags); | |
71 | set_free_free(device->devlinks); | |
72 | ||
73 | return mfree(device); | |
57fa1d09 TG |
74 | } |
75 | ||
8301aa0b | 76 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device, sd_device, device_free); |
57fa1d09 TG |
77 | |
78 | int device_add_property_aux(sd_device *device, const char *_key, const char *_value, bool db) { | |
79 | OrderedHashmap **properties; | |
80 | ||
81 | assert(device); | |
82 | assert(_key); | |
83 | ||
84 | if (db) | |
85 | properties = &device->properties_db; | |
86 | else | |
87 | properties = &device->properties; | |
88 | ||
89 | if (_value) { | |
90 | _cleanup_free_ char *key = NULL, *value = NULL, *old_key = NULL, *old_value = NULL; | |
91 | int r; | |
92 | ||
93 | r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops); | |
94 | if (r < 0) | |
95 | return r; | |
96 | ||
97 | key = strdup(_key); | |
98 | if (!key) | |
99 | return -ENOMEM; | |
100 | ||
101 | value = strdup(_value); | |
102 | if (!value) | |
103 | return -ENOMEM; | |
104 | ||
105 | old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key); | |
106 | ||
107 | r = ordered_hashmap_replace(*properties, key, value); | |
108 | if (r < 0) | |
109 | return r; | |
110 | ||
111 | key = NULL; | |
112 | value = NULL; | |
113 | } else { | |
114 | _cleanup_free_ char *key = NULL; | |
115 | _cleanup_free_ char *value = NULL; | |
116 | ||
117 | value = ordered_hashmap_remove2(*properties, _key, (void**) &key); | |
118 | } | |
119 | ||
120 | if (!db) { | |
313cefa1 | 121 | device->properties_generation++; |
57fa1d09 TG |
122 | device->properties_buf_outdated = true; |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | int device_add_property_internal(sd_device *device, const char *key, const char *value) { | |
129 | return device_add_property_aux(device, key, value, false); | |
130 | } | |
131 | ||
132 | int device_set_syspath(sd_device *device, const char *_syspath, bool verify) { | |
133 | _cleanup_free_ char *syspath = NULL; | |
134 | const char *devpath; | |
135 | int r; | |
136 | ||
137 | assert(device); | |
138 | assert(_syspath); | |
139 | ||
140 | /* must be a subdirectory of /sys */ | |
141 | if (!path_startswith(_syspath, "/sys/")) { | |
142 | log_debug("sd-device: syspath '%s' is not a subdirectory of /sys", _syspath); | |
143 | return -EINVAL; | |
144 | } | |
145 | ||
146 | if (verify) { | |
5bbe8eab | 147 | r = chase_symlinks(_syspath, NULL, 0, &syspath); |
08232a02 | 148 | if (r == -ENOENT) |
d89e0dc8 LP |
149 | return -ENODEV; /* the device does not exist (any more?) */ |
150 | if (r < 0) | |
151 | return log_debug_errno(r, "sd-device: could not get target of '%s': %m", _syspath); | |
57fa1d09 | 152 | |
2e1ec12e YW |
153 | if (!path_startswith(syspath, "/sys")) { |
154 | _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL; | |
155 | char *p; | |
156 | ||
157 | /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */ | |
158 | r = chase_symlinks("/sys", NULL, 0, &real_sys); | |
159 | if (r < 0) | |
160 | return log_debug_errno(r, "sd-device: could not chase symlink /sys: %m"); | |
161 | ||
162 | p = path_startswith(syspath, real_sys); | |
163 | if (!p) { | |
164 | log_debug("sd-device: canonicalized path '%s' does not starts with sysfs mount point '%s'", syspath, real_sys); | |
165 | return -ENODEV; | |
166 | } | |
167 | ||
168 | new_syspath = strjoin("/sys/", p); | |
169 | if (!new_syspath) | |
170 | return log_oom(); | |
171 | ||
172 | free_and_replace(syspath, new_syspath); | |
858d36c1 | 173 | path_simplify(syspath, false); |
2e1ec12e YW |
174 | } |
175 | ||
57fa1d09 TG |
176 | if (path_startswith(syspath, "/sys/devices/")) { |
177 | char *path; | |
178 | ||
179 | /* all 'devices' require an 'uevent' file */ | |
180 | path = strjoina(syspath, "/uevent"); | |
181 | r = access(path, F_OK); | |
182 | if (r < 0) { | |
52d62901 TG |
183 | if (errno == ENOENT) |
184 | /* this is not a valid device */ | |
185 | return -ENODEV; | |
186 | ||
25f027c5 | 187 | return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath); |
57fa1d09 TG |
188 | } |
189 | } else { | |
61233823 | 190 | /* everything else just needs to be a directory */ |
52d62901 TG |
191 | if (!is_dir(syspath, false)) |
192 | return -ENODEV; | |
57fa1d09 TG |
193 | } |
194 | } else { | |
195 | syspath = strdup(_syspath); | |
196 | if (!syspath) | |
197 | return -ENOMEM; | |
198 | } | |
199 | ||
fbd0b64f | 200 | devpath = syspath + STRLEN("/sys"); |
57fa1d09 TG |
201 | |
202 | r = device_add_property_internal(device, "DEVPATH", devpath); | |
203 | if (r < 0) | |
204 | return r; | |
205 | ||
f9ecfd3b | 206 | free_and_replace(device->syspath, syspath); |
57fa1d09 TG |
207 | |
208 | device->devpath = devpath; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { | |
4afd3348 | 214 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
215 | int r; |
216 | ||
217 | assert_return(ret, -EINVAL); | |
218 | assert_return(syspath, -EINVAL); | |
219 | ||
220 | r = device_new_aux(&device); | |
221 | if (r < 0) | |
222 | return r; | |
223 | ||
224 | r = device_set_syspath(device, syspath, true); | |
225 | if (r < 0) | |
226 | return r; | |
227 | ||
1cc6c93a | 228 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
233 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
234 | char *syspath; | |
235 | char id[DECIMAL_STR_MAX(unsigned) * 2 + 1]; | |
236 | ||
237 | assert_return(ret, -EINVAL); | |
945c2931 | 238 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); |
57fa1d09 TG |
239 | |
240 | /* use /sys/dev/{block,char}/<maj>:<min> link */ | |
241 | snprintf(id, sizeof(id), "%u:%u", major(devnum), minor(devnum)); | |
242 | ||
243 | syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id); | |
244 | ||
245 | return sd_device_new_from_syspath(ret, syspath); | |
246 | } | |
247 | ||
248 | _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) { | |
21d6220f TG |
249 | char *name, *syspath; |
250 | size_t len = 0; | |
57fa1d09 TG |
251 | |
252 | assert_return(ret, -EINVAL); | |
253 | assert_return(subsystem, -EINVAL); | |
254 | assert_return(sysname, -EINVAL); | |
255 | ||
256 | if (streq(subsystem, "subsystem")) { | |
257 | syspath = strjoina("/sys/subsystem/", sysname); | |
258 | if (access(syspath, F_OK) >= 0) | |
259 | return sd_device_new_from_syspath(ret, syspath); | |
260 | ||
261 | syspath = strjoina("/sys/bus/", sysname); | |
262 | if (access(syspath, F_OK) >= 0) | |
263 | return sd_device_new_from_syspath(ret, syspath); | |
264 | ||
265 | syspath = strjoina("/sys/class/", sysname); | |
266 | if (access(syspath, F_OK) >= 0) | |
267 | return sd_device_new_from_syspath(ret, syspath); | |
268 | } else if (streq(subsystem, "module")) { | |
269 | syspath = strjoina("/sys/module/", sysname); | |
270 | if (access(syspath, F_OK) >= 0) | |
271 | return sd_device_new_from_syspath(ret, syspath); | |
272 | } else if (streq(subsystem, "drivers")) { | |
273 | char subsys[PATH_MAX]; | |
274 | char *driver; | |
275 | ||
276 | strscpy(subsys, sizeof(subsys), sysname); | |
277 | driver = strchr(subsys, ':'); | |
278 | if (driver) { | |
279 | driver[0] = '\0'; | |
280 | driver++; | |
281 | ||
282 | syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver); | |
283 | if (access(syspath, F_OK) >= 0) | |
284 | return sd_device_new_from_syspath(ret, syspath); | |
285 | ||
286 | syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver); | |
287 | if (access(syspath, F_OK) >= 0) | |
288 | return sd_device_new_from_syspath(ret, syspath); | |
21d6220f TG |
289 | } |
290 | } | |
a9ec9f29 | 291 | |
21d6220f TG |
292 | /* translate sysname back to sysfs filename */ |
293 | name = strdupa(sysname); | |
294 | while (name[len] != '\0') { | |
295 | if (name[len] == '/') | |
296 | name[len] = '!'; | |
a9ec9f29 | 297 | |
21d6220f TG |
298 | len++; |
299 | } | |
a9ec9f29 | 300 | |
21d6220f TG |
301 | syspath = strjoina("/sys/subsystem/", 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/bus/", subsystem, "/devices/", name); |
306 | if (access(syspath, F_OK) >= 0) | |
307 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 308 | |
21d6220f TG |
309 | syspath = strjoina("/sys/class/", subsystem, "/", name); |
310 | if (access(syspath, F_OK) >= 0) | |
311 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 312 | |
a918b673 PK |
313 | syspath = strjoina("/sys/firmware/", subsystem, "/", sysname); |
314 | if (access(syspath, F_OK) >= 0) | |
315 | return sd_device_new_from_syspath(ret, syspath); | |
316 | ||
08232a02 | 317 | return -ENODEV; |
57fa1d09 TG |
318 | } |
319 | ||
320 | int device_set_devtype(sd_device *device, const char *_devtype) { | |
321 | _cleanup_free_ char *devtype = NULL; | |
322 | int r; | |
323 | ||
324 | assert(device); | |
325 | assert(_devtype); | |
326 | ||
327 | devtype = strdup(_devtype); | |
328 | if (!devtype) | |
329 | return -ENOMEM; | |
330 | ||
331 | r = device_add_property_internal(device, "DEVTYPE", devtype); | |
332 | if (r < 0) | |
333 | return r; | |
334 | ||
f9ecfd3b | 335 | free_and_replace(device->devtype, devtype); |
57fa1d09 TG |
336 | |
337 | return 0; | |
338 | } | |
339 | ||
340 | int device_set_ifindex(sd_device *device, const char *_ifindex) { | |
341 | int ifindex, r; | |
342 | ||
343 | assert(device); | |
344 | assert(_ifindex); | |
345 | ||
6ad623a3 | 346 | r = parse_ifindex(_ifindex, &ifindex); |
57fa1d09 TG |
347 | if (r < 0) |
348 | return r; | |
349 | ||
57fa1d09 TG |
350 | r = device_add_property_internal(device, "IFINDEX", _ifindex); |
351 | if (r < 0) | |
352 | return r; | |
353 | ||
354 | device->ifindex = ifindex; | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | int device_set_devname(sd_device *device, const char *_devname) { | |
360 | _cleanup_free_ char *devname = NULL; | |
361 | int r; | |
362 | ||
363 | assert(device); | |
364 | assert(_devname); | |
365 | ||
366 | if (_devname[0] != '/') { | |
367 | r = asprintf(&devname, "/dev/%s", _devname); | |
368 | if (r < 0) | |
369 | return -ENOMEM; | |
370 | } else { | |
371 | devname = strdup(_devname); | |
372 | if (!devname) | |
373 | return -ENOMEM; | |
374 | } | |
375 | ||
376 | r = device_add_property_internal(device, "DEVNAME", devname); | |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
f9ecfd3b | 380 | free_and_replace(device->devname, devname); |
57fa1d09 TG |
381 | |
382 | return 0; | |
383 | } | |
384 | ||
385 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
386 | unsigned devmode; | |
387 | int r; | |
388 | ||
389 | assert(device); | |
390 | assert(_devmode); | |
391 | ||
392 | r = safe_atou(_devmode, &devmode); | |
393 | if (r < 0) | |
394 | return r; | |
395 | ||
396 | if (devmode > 07777) | |
397 | return -EINVAL; | |
398 | ||
399 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
400 | if (r < 0) | |
401 | return r; | |
402 | ||
403 | device->devmode = devmode; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
409 | unsigned maj = 0, min = 0; | |
410 | int r; | |
411 | ||
412 | assert(device); | |
413 | assert(major); | |
414 | ||
415 | r = safe_atou(major, &maj); | |
416 | if (r < 0) | |
417 | return r; | |
418 | if (!maj) | |
419 | return 0; | |
420 | ||
421 | if (minor) { | |
422 | r = safe_atou(minor, &min); | |
423 | if (r < 0) | |
424 | return r; | |
425 | } | |
426 | ||
427 | r = device_add_property_internal(device, "MAJOR", major); | |
428 | if (r < 0) | |
429 | return r; | |
430 | ||
431 | if (minor) { | |
432 | r = device_add_property_internal(device, "MINOR", minor); | |
433 | if (r < 0) | |
434 | return r; | |
435 | } | |
436 | ||
437 | device->devnum = makedev(maj, min); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) { | |
443 | int r; | |
444 | ||
445 | assert(device); | |
446 | assert(key); | |
447 | assert(value); | |
448 | assert(major); | |
449 | assert(minor); | |
450 | ||
451 | if (streq(key, "DEVTYPE")) { | |
452 | r = device_set_devtype(device, value); | |
453 | if (r < 0) | |
454 | return r; | |
455 | } else if (streq(key, "IFINDEX")) { | |
456 | r = device_set_ifindex(device, value); | |
457 | if (r < 0) | |
458 | return r; | |
459 | } else if (streq(key, "DEVNAME")) { | |
460 | r = device_set_devname(device, value); | |
461 | if (r < 0) | |
462 | return r; | |
463 | } else if (streq(key, "DEVMODE")) { | |
464 | r = device_set_devmode(device, value); | |
465 | if (r < 0) | |
466 | return r; | |
467 | } else if (streq(key, "MAJOR")) | |
468 | *major = value; | |
469 | else if (streq(key, "MINOR")) | |
470 | *minor = value; | |
471 | else { | |
472 | r = device_add_property_internal(device, key, value); | |
473 | if (r < 0) | |
474 | return r; | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | int device_read_uevent_file(sd_device *device) { | |
481 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 482 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
483 | char *path; |
484 | size_t uevent_len; | |
485 | unsigned i; | |
486 | int r; | |
487 | ||
488 | enum { | |
489 | PRE_KEY, | |
490 | KEY, | |
491 | PRE_VALUE, | |
492 | VALUE, | |
493 | INVALID_LINE, | |
494 | } state = PRE_KEY; | |
495 | ||
496 | assert(device); | |
497 | ||
498 | if (device->uevent_loaded || device->sealed) | |
499 | return 0; | |
500 | ||
7141e4f6 TG |
501 | device->uevent_loaded = true; |
502 | ||
57fa1d09 TG |
503 | r = sd_device_get_syspath(device, &syspath); |
504 | if (r < 0) | |
505 | return r; | |
506 | ||
507 | path = strjoina(syspath, "/uevent"); | |
508 | ||
509 | r = read_full_file(path, &uevent, &uevent_len); | |
bba06166 TG |
510 | if (r == -EACCES) |
511 | /* empty uevent files may be write-only */ | |
512 | return 0; | |
2a213740 TG |
513 | else if (r == -ENOENT) |
514 | /* some devices may not have uevent files, see set_syspath() */ | |
515 | return 0; | |
fc95c359 YW |
516 | else if (r < 0) |
517 | return log_debug_errno(r, "sd-device: failed to read uevent file '%s': %m", path); | |
57fa1d09 | 518 | |
755700bb | 519 | for (i = 0; i < uevent_len; i++) |
57fa1d09 TG |
520 | switch (state) { |
521 | case PRE_KEY: | |
522 | if (!strchr(NEWLINE, uevent[i])) { | |
523 | key = &uevent[i]; | |
524 | ||
525 | state = KEY; | |
526 | } | |
527 | ||
528 | break; | |
529 | case KEY: | |
530 | if (uevent[i] == '=') { | |
531 | uevent[i] = '\0'; | |
532 | ||
533 | state = PRE_VALUE; | |
534 | } else if (strchr(NEWLINE, uevent[i])) { | |
535 | uevent[i] = '\0'; | |
536 | log_debug("sd-device: ignoring invalid uevent line '%s'", key); | |
537 | ||
538 | state = PRE_KEY; | |
539 | } | |
540 | ||
541 | break; | |
542 | case PRE_VALUE: | |
543 | value = &uevent[i]; | |
57fa1d09 TG |
544 | state = VALUE; |
545 | ||
4831981d | 546 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
547 | case VALUE: |
548 | if (strchr(NEWLINE, uevent[i])) { | |
549 | uevent[i] = '\0'; | |
550 | ||
551 | r = handle_uevent_line(device, key, value, &major, &minor); | |
552 | if (r < 0) | |
19c29853 | 553 | log_debug_errno(r, "sd-device: failed to handle uevent entry '%s=%s': %m", key, value); |
57fa1d09 TG |
554 | |
555 | state = PRE_KEY; | |
556 | } | |
557 | ||
558 | break; | |
559 | default: | |
560 | assert_not_reached("invalid state when parsing uevent file"); | |
561 | } | |
57fa1d09 TG |
562 | |
563 | if (major) { | |
564 | r = device_set_devnum(device, major, minor); | |
565 | if (r < 0) | |
23446f01 | 566 | log_debug_errno(r, "sd-device: could not set 'MAJOR=%s' or 'MINOR=%s' from '%s': %m", major, minor, path); |
57fa1d09 TG |
567 | } |
568 | ||
57fa1d09 TG |
569 | return 0; |
570 | } | |
571 | ||
572 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
573 | int r; | |
574 | ||
575 | assert_return(device, -EINVAL); | |
576 | assert_return(ifindex, -EINVAL); | |
577 | ||
578 | r = device_read_uevent_file(device); | |
579 | if (r < 0) | |
580 | return r; | |
581 | ||
dcfbde3a YW |
582 | if (device->ifindex < 0) |
583 | return -ENOENT; | |
584 | ||
57fa1d09 TG |
585 | *ifindex = device->ifindex; |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
591 | int r; | |
592 | ||
593 | assert_return(ret, -EINVAL); | |
594 | assert_return(id, -EINVAL); | |
595 | ||
596 | switch (id[0]) { | |
597 | case 'b': | |
598 | case 'c': | |
599 | { | |
600 | char type; | |
601 | int maj, min; | |
602 | ||
603 | r = sscanf(id, "%c%i:%i", &type, &maj, &min); | |
604 | if (r != 3) | |
605 | return -EINVAL; | |
606 | ||
607 | return sd_device_new_from_devnum(ret, type, makedev(maj, min)); | |
608 | } | |
609 | case 'n': | |
610 | { | |
4afd3348 | 611 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
612 | _cleanup_close_ int sk = -1; |
613 | struct ifreq ifr = {}; | |
614 | int ifindex; | |
615 | ||
6ad623a3 | 616 | r = parse_ifindex(&id[1], &ifr.ifr_ifindex); |
57fa1d09 TG |
617 | if (r < 0) |
618 | return r; | |
57fa1d09 | 619 | |
429b4350 | 620 | sk = socket_ioctl_fd(); |
57fa1d09 | 621 | if (sk < 0) |
429b4350 | 622 | return sk; |
57fa1d09 TG |
623 | |
624 | r = ioctl(sk, SIOCGIFNAME, &ifr); | |
625 | if (r < 0) | |
626 | return -errno; | |
627 | ||
628 | r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name); | |
629 | if (r < 0) | |
630 | return r; | |
631 | ||
632 | r = sd_device_get_ifindex(device, &ifindex); | |
633 | if (r < 0) | |
634 | return r; | |
635 | ||
08232a02 | 636 | /* this is racey, so we might end up with the wrong device */ |
57fa1d09 TG |
637 | if (ifr.ifr_ifindex != ifindex) |
638 | return -ENODEV; | |
639 | ||
1cc6c93a | 640 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
641 | |
642 | return 0; | |
643 | } | |
644 | case '+': | |
645 | { | |
646 | char subsys[PATH_MAX]; | |
647 | char *sysname; | |
648 | ||
db2f8a2e | 649 | (void) strscpy(subsys, sizeof(subsys), id + 1); |
57fa1d09 TG |
650 | sysname = strchr(subsys, ':'); |
651 | if (!sysname) | |
652 | return -EINVAL; | |
653 | ||
654 | sysname[0] = '\0'; | |
313cefa1 | 655 | sysname++; |
57fa1d09 TG |
656 | |
657 | return sd_device_new_from_subsystem_sysname(ret, subsys, sysname); | |
658 | } | |
659 | default: | |
660 | return -EINVAL; | |
661 | } | |
662 | } | |
663 | ||
664 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
665 | assert_return(device, -EINVAL); | |
666 | assert_return(ret, -EINVAL); | |
667 | ||
668 | assert(path_startswith(device->syspath, "/sys/")); | |
669 | ||
670 | *ret = device->syspath; | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static int device_new_from_child(sd_device **ret, sd_device *child) { | |
676 | _cleanup_free_ char *path = NULL; | |
677 | const char *subdir, *syspath; | |
678 | int r; | |
679 | ||
680 | assert(ret); | |
681 | assert(child); | |
682 | ||
683 | r = sd_device_get_syspath(child, &syspath); | |
684 | if (r < 0) | |
685 | return r; | |
686 | ||
687 | path = strdup(syspath); | |
688 | if (!path) | |
689 | return -ENOMEM; | |
fbd0b64f | 690 | subdir = path + STRLEN("/sys"); |
57fa1d09 TG |
691 | |
692 | for (;;) { | |
693 | char *pos; | |
694 | ||
695 | pos = strrchr(subdir, '/'); | |
696 | if (!pos || pos < subdir + 2) | |
697 | break; | |
698 | ||
699 | *pos = '\0'; | |
700 | ||
701 | r = sd_device_new_from_syspath(ret, path); | |
702 | if (r < 0) | |
703 | continue; | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
08232a02 | 708 | return -ENODEV; |
57fa1d09 TG |
709 | } |
710 | ||
711 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
712 | ||
713 | assert_return(ret, -EINVAL); | |
714 | assert_return(child, -EINVAL); | |
715 | ||
716 | if (!child->parent_set) { | |
717 | child->parent_set = true; | |
718 | ||
db2f8a2e | 719 | (void) device_new_from_child(&child->parent, child); |
57fa1d09 TG |
720 | } |
721 | ||
722 | if (!child->parent) | |
723 | return -ENOENT; | |
724 | ||
725 | *ret = child->parent; | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | int device_set_subsystem(sd_device *device, const char *_subsystem) { | |
731 | _cleanup_free_ char *subsystem = NULL; | |
732 | int r; | |
733 | ||
734 | assert(device); | |
735 | assert(_subsystem); | |
736 | ||
737 | subsystem = strdup(_subsystem); | |
738 | if (!subsystem) | |
739 | return -ENOMEM; | |
740 | ||
741 | r = device_add_property_internal(device, "SUBSYSTEM", subsystem); | |
742 | if (r < 0) | |
743 | return r; | |
744 | ||
f9ecfd3b | 745 | free_and_replace(device->subsystem, subsystem); |
57fa1d09 TG |
746 | |
747 | device->subsystem_set = true; | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
de7e983e TG |
752 | static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) { |
753 | _cleanup_free_ char *subsystem = NULL; | |
754 | int r; | |
755 | ||
756 | assert(device); | |
757 | assert(_subsystem); | |
758 | assert(*_subsystem); | |
759 | ||
760 | subsystem = strdup(_subsystem); | |
761 | if (!subsystem) | |
762 | return -ENOMEM; | |
763 | ||
764 | r = device_set_subsystem(device, "drivers"); | |
765 | if (r < 0) | |
766 | return r; | |
767 | ||
f9ecfd3b | 768 | free_and_replace(device->driver_subsystem, subsystem); |
de7e983e TG |
769 | |
770 | return 0; | |
771 | } | |
772 | ||
57fa1d09 | 773 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
774 | const char *syspath, *drivers = NULL; |
775 | int r; | |
776 | ||
57fa1d09 TG |
777 | assert_return(ret, -EINVAL); |
778 | assert_return(device, -EINVAL); | |
779 | ||
de7e983e TG |
780 | r = sd_device_get_syspath(device, &syspath); |
781 | if (r < 0) | |
782 | return r; | |
783 | ||
57fa1d09 TG |
784 | if (!device->subsystem_set) { |
785 | _cleanup_free_ char *subsystem = NULL; | |
57fa1d09 | 786 | char *path; |
57fa1d09 TG |
787 | |
788 | /* read 'subsystem' link */ | |
57fa1d09 TG |
789 | path = strjoina(syspath, "/subsystem"); |
790 | r = readlink_value(path, &subsystem); | |
791 | if (r >= 0) | |
792 | r = device_set_subsystem(device, subsystem); | |
793 | /* use implicit names */ | |
794 | else if (path_startswith(device->devpath, "/module/")) | |
795 | r = device_set_subsystem(device, "module"); | |
de7e983e TG |
796 | else if (!(drivers = strstr(syspath, "/drivers/")) && |
797 | (path_startswith(device->devpath, "/subsystem/") || | |
798 | path_startswith(device->devpath, "/class/") || | |
799 | path_startswith(device->devpath, "/bus/"))) | |
57fa1d09 | 800 | r = device_set_subsystem(device, "subsystem"); |
4189708a | 801 | if (r < 0 && r != -ENOENT) |
5a917c06 | 802 | return log_debug_errno(r, "sd-device: could not set subsystem for %s: %m", device->devpath); |
57fa1d09 TG |
803 | |
804 | device->subsystem_set = true; | |
de7e983e TG |
805 | } else if (!device->driver_subsystem_set) |
806 | drivers = strstr(syspath, "/drivers/"); | |
807 | ||
808 | if (!device->driver_subsystem_set) { | |
809 | if (drivers) { | |
810 | _cleanup_free_ char *subpath = NULL; | |
811 | ||
812 | subpath = strndup(syspath, drivers - syspath); | |
813 | if (!subpath) | |
814 | r = -ENOMEM; | |
815 | else { | |
816 | const char *subsys; | |
817 | ||
818 | subsys = strrchr(subpath, '/'); | |
819 | if (!subsys) | |
820 | r = -EINVAL; | |
821 | else | |
822 | r = device_set_drivers_subsystem(device, subsys + 1); | |
823 | } | |
824 | if (r < 0 && r != -ENOENT) | |
825 | return log_debug_errno(r, "sd-device: could not set subsystem for driver %s: %m", device->devpath); | |
826 | } | |
827 | ||
828 | device->driver_subsystem_set = true; | |
57fa1d09 TG |
829 | } |
830 | ||
bf4c113e DH |
831 | if (!device->subsystem) |
832 | return -ENOENT; | |
833 | ||
57fa1d09 TG |
834 | *ret = device->subsystem; |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
840 | int r; | |
841 | ||
842 | assert(devtype); | |
843 | assert(device); | |
844 | ||
845 | r = device_read_uevent_file(device); | |
846 | if (r < 0) | |
847 | return r; | |
848 | ||
dcfbde3a YW |
849 | if (!device->devtype) |
850 | return -ENOENT; | |
851 | ||
57fa1d09 TG |
852 | *devtype = device->devtype; |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
858 | sd_device *parent = NULL; | |
859 | int r; | |
860 | ||
861 | assert_return(child, -EINVAL); | |
862 | assert_return(subsystem, -EINVAL); | |
863 | ||
864 | r = sd_device_get_parent(child, &parent); | |
865 | while (r >= 0) { | |
866 | const char *parent_subsystem = NULL; | |
867 | const char *parent_devtype = NULL; | |
868 | ||
db2f8a2e | 869 | (void) sd_device_get_subsystem(parent, &parent_subsystem); |
57fa1d09 TG |
870 | if (streq_ptr(parent_subsystem, subsystem)) { |
871 | if (!devtype) | |
872 | break; | |
873 | ||
db2f8a2e | 874 | (void) sd_device_get_devtype(parent, &parent_devtype); |
57fa1d09 TG |
875 | if (streq_ptr(parent_devtype, devtype)) |
876 | break; | |
877 | } | |
878 | r = sd_device_get_parent(parent, &parent); | |
879 | } | |
880 | ||
881 | if (r < 0) | |
882 | return r; | |
883 | ||
884 | *ret = parent; | |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
889 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
890 | int r; | |
891 | ||
892 | assert_return(device, -EINVAL); | |
893 | assert_return(devnum, -EINVAL); | |
894 | ||
895 | r = device_read_uevent_file(device); | |
896 | if (r < 0) | |
897 | return r; | |
898 | ||
dcfbde3a YW |
899 | if (major(device->devnum) <= 0) |
900 | return -ENOENT; | |
901 | ||
57fa1d09 TG |
902 | *devnum = device->devnum; |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | int device_set_driver(sd_device *device, const char *_driver) { | |
908 | _cleanup_free_ char *driver = NULL; | |
909 | int r; | |
910 | ||
911 | assert(device); | |
912 | assert(_driver); | |
913 | ||
914 | driver = strdup(_driver); | |
915 | if (!driver) | |
916 | return -ENOMEM; | |
917 | ||
918 | r = device_add_property_internal(device, "DRIVER", driver); | |
919 | if (r < 0) | |
920 | return r; | |
921 | ||
f9ecfd3b | 922 | free_and_replace(device->driver, driver); |
57fa1d09 TG |
923 | |
924 | device->driver_set = true; | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
930 | assert_return(device, -EINVAL); | |
931 | assert_return(ret, -EINVAL); | |
932 | ||
933 | if (!device->driver_set) { | |
934 | _cleanup_free_ char *driver = NULL; | |
935 | const char *syspath; | |
936 | char *path; | |
937 | int r; | |
938 | ||
939 | r = sd_device_get_syspath(device, &syspath); | |
940 | if (r < 0) | |
941 | return r; | |
942 | ||
943 | path = strjoina(syspath, "/driver"); | |
944 | r = readlink_value(path, &driver); | |
945 | if (r >= 0) { | |
946 | r = device_set_driver(device, driver); | |
947 | if (r < 0) | |
7283a80d TG |
948 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); |
949 | } else if (r == -ENOENT) | |
950 | device->driver_set = true; | |
951 | else | |
952 | return log_debug_errno(r, "sd-device: could not set driver for %s: %m", device->devpath); | |
57fa1d09 TG |
953 | } |
954 | ||
bf4c113e DH |
955 | if (!device->driver) |
956 | return -ENOENT; | |
957 | ||
57fa1d09 TG |
958 | *ret = device->driver; |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | _public_ int sd_device_get_devpath(sd_device *device, const char **devpath) { | |
964 | assert_return(device, -EINVAL); | |
965 | assert_return(devpath, -EINVAL); | |
966 | ||
967 | assert(device->devpath); | |
968 | assert(device->devpath[0] == '/'); | |
969 | ||
970 | *devpath = device->devpath; | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
975 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
976 | int r; | |
977 | ||
978 | assert_return(device, -EINVAL); | |
979 | assert_return(devname, -EINVAL); | |
980 | ||
981 | r = device_read_uevent_file(device); | |
982 | if (r < 0) | |
983 | return r; | |
984 | ||
985 | if (!device->devname) | |
986 | return -ENOENT; | |
987 | ||
988 | assert(path_startswith(device->devname, "/dev/")); | |
989 | ||
990 | *devname = device->devname; | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | static int device_set_sysname(sd_device *device) { | |
996 | _cleanup_free_ char *sysname = NULL; | |
afcac065 | 997 | const char *sysnum = NULL; |
57fa1d09 TG |
998 | const char *pos; |
999 | size_t len = 0; | |
1000 | ||
1001 | pos = strrchr(device->devpath, '/'); | |
1002 | if (!pos) | |
1003 | return -EINVAL; | |
313cefa1 | 1004 | pos++; |
57fa1d09 TG |
1005 | |
1006 | /* devpath is not a root directory */ | |
1007 | if (*pos == '\0' || pos <= device->devpath) | |
1008 | return -EINVAL; | |
1009 | ||
1010 | sysname = strdup(pos); | |
1011 | if (!sysname) | |
1012 | return -ENOMEM; | |
1013 | ||
1014 | /* some devices have '!' in their name, change that to '/' */ | |
1015 | while (sysname[len] != '\0') { | |
1016 | if (sysname[len] == '!') | |
1017 | sysname[len] = '/'; | |
1018 | ||
313cefa1 | 1019 | len++; |
57fa1d09 TG |
1020 | } |
1021 | ||
1022 | /* trailing number */ | |
1023 | while (len > 0 && isdigit(sysname[--len])) | |
1024 | sysnum = &sysname[len]; | |
1025 | ||
1026 | if (len == 0) | |
1027 | sysnum = NULL; | |
1028 | ||
f9ecfd3b | 1029 | free_and_replace(device->sysname, sysname); |
57fa1d09 TG |
1030 | |
1031 | device->sysnum = sysnum; | |
1032 | ||
1033 | device->sysname_set = true; | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1039 | int r; | |
1040 | ||
1041 | assert_return(device, -EINVAL); | |
1042 | assert_return(ret, -EINVAL); | |
1043 | ||
1044 | if (!device->sysname_set) { | |
1045 | r = device_set_sysname(device); | |
1046 | if (r < 0) | |
1047 | return r; | |
1048 | } | |
1049 | ||
bf4c113e DH |
1050 | assert_return(device->sysname, -ENOENT); |
1051 | ||
57fa1d09 TG |
1052 | *ret = device->sysname; |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1058 | int r; | |
1059 | ||
1060 | assert_return(device, -EINVAL); | |
1061 | assert_return(ret, -EINVAL); | |
1062 | ||
1063 | if (!device->sysname_set) { | |
1064 | r = device_set_sysname(device); | |
1065 | if (r < 0) | |
1066 | return r; | |
1067 | } | |
1068 | ||
dcfbde3a YW |
1069 | if (!device->sysnum) |
1070 | return -ENOENT; | |
1071 | ||
57fa1d09 TG |
1072 | *ret = device->sysnum; |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static bool is_valid_tag(const char *tag) { | |
1078 | assert(tag); | |
1079 | ||
1080 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1081 | } | |
1082 | ||
1083 | int device_add_tag(sd_device *device, const char *tag) { | |
1084 | int r; | |
1085 | ||
1086 | assert(device); | |
1087 | assert(tag); | |
1088 | ||
1089 | if (!is_valid_tag(tag)) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | r = set_ensure_allocated(&device->tags, &string_hash_ops); | |
1093 | if (r < 0) | |
1094 | return r; | |
1095 | ||
1096 | r = set_put_strdup(device->tags, tag); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | ||
313cefa1 | 1100 | device->tags_generation++; |
57fa1d09 TG |
1101 | device->property_tags_outdated = true; |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int device_add_devlink(sd_device *device, const char *devlink) { | |
1107 | int r; | |
1108 | ||
1109 | assert(device); | |
1110 | assert(devlink); | |
1111 | ||
1112 | r = set_ensure_allocated(&device->devlinks, &string_hash_ops); | |
1113 | if (r < 0) | |
1114 | return r; | |
1115 | ||
1116 | r = set_put_strdup(device->devlinks, devlink); | |
1117 | if (r < 0) | |
1118 | return r; | |
1119 | ||
313cefa1 | 1120 | device->devlinks_generation++; |
57fa1d09 TG |
1121 | device->property_devlinks_outdated = true; |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { | |
1127 | _cleanup_free_ char *key = NULL; | |
1128 | char *value; | |
1129 | ||
1130 | assert(device); | |
1131 | assert(str); | |
1132 | ||
1133 | key = strdup(str); | |
1134 | if (!key) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | value = strchr(key, '='); | |
1138 | if (!value) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | *value = '\0'; | |
1142 | ||
1143 | if (isempty(++value)) | |
1144 | value = NULL; | |
1145 | ||
1146 | return device_add_property_internal(device, key, value); | |
1147 | } | |
1148 | ||
1149 | int device_set_usec_initialized(sd_device *device, const char *initialized) { | |
1150 | uint64_t usec_initialized; | |
1151 | int r; | |
1152 | ||
1153 | assert(device); | |
1154 | assert(initialized); | |
1155 | ||
1156 | r = safe_atou64(initialized, &usec_initialized); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | ||
1160 | r = device_add_property_internal(device, "USEC_INITIALIZED", initialized); | |
1161 | if (r < 0) | |
1162 | return r; | |
1163 | ||
1164 | device->usec_initialized = usec_initialized; | |
1165 | ||
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
1170 | char *path; | |
1171 | int r; | |
1172 | ||
1173 | assert(device); | |
1174 | assert(value); | |
1175 | ||
1176 | switch (key) { | |
1177 | case 'G': | |
1178 | r = device_add_tag(device, value); | |
1179 | if (r < 0) | |
1180 | return r; | |
1181 | ||
1182 | break; | |
1183 | case 'S': | |
1184 | path = strjoina("/dev/", value); | |
1185 | r = device_add_devlink(device, path); | |
1186 | if (r < 0) | |
1187 | return r; | |
1188 | ||
1189 | break; | |
1190 | case 'E': | |
1191 | r = device_add_property_internal_from_string(device, value); | |
1192 | if (r < 0) | |
1193 | return r; | |
1194 | ||
1195 | break; | |
1196 | case 'I': | |
1197 | r = device_set_usec_initialized(device, value); | |
1198 | if (r < 0) | |
1199 | return r; | |
1200 | ||
1201 | break; | |
1202 | case 'L': | |
1203 | r = safe_atoi(value, &device->devlink_priority); | |
1204 | if (r < 0) | |
1205 | return r; | |
1206 | ||
1207 | break; | |
1208 | case 'W': | |
1209 | r = safe_atoi(value, &device->watch_handle); | |
1210 | if (r < 0) | |
1211 | return r; | |
1212 | ||
1213 | break; | |
1214 | default: | |
1215 | log_debug("device db: unknown key '%c'", key); | |
1216 | } | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | int device_get_id_filename(sd_device *device, const char **ret) { | |
1222 | assert(device); | |
1223 | assert(ret); | |
1224 | ||
1225 | if (!device->id_filename) { | |
1226 | _cleanup_free_ char *id = NULL; | |
1227 | const char *subsystem; | |
1228 | dev_t devnum; | |
1229 | int ifindex, r; | |
1230 | ||
1231 | r = sd_device_get_subsystem(device, &subsystem); | |
1232 | if (r < 0) | |
1233 | return r; | |
1234 | ||
dcfbde3a | 1235 | if (sd_device_get_devnum(device, &devnum) >= 0) { |
4189708a TG |
1236 | assert(subsystem); |
1237 | ||
ccddd104 | 1238 | /* use dev_t — b259:131072, c254:0 */ |
57fa1d09 TG |
1239 | r = asprintf(&id, "%c%u:%u", |
1240 | streq(subsystem, "block") ? 'b' : 'c', | |
1241 | major(devnum), minor(devnum)); | |
1242 | if (r < 0) | |
53fae771 | 1243 | return -ENOMEM; |
dcfbde3a | 1244 | } else if (sd_device_get_ifindex(device, &ifindex) >= 0 && ifindex > 0) { |
ccddd104 | 1245 | /* use netdev ifindex — n3 */ |
57fa1d09 TG |
1246 | r = asprintf(&id, "n%u", ifindex); |
1247 | if (r < 0) | |
53fae771 | 1248 | return -ENOMEM; |
57fa1d09 | 1249 | } else { |
ccddd104 | 1250 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
57fa1d09 TG |
1251 | * sysname() has '!' translated, get it from devpath |
1252 | */ | |
1253 | const char *sysname; | |
1254 | ||
1255 | sysname = basename(device->devpath); | |
1256 | if (!sysname) | |
4189708a TG |
1257 | return -EINVAL; |
1258 | ||
1259 | if (!subsystem) | |
57fa1d09 TG |
1260 | return -EINVAL; |
1261 | ||
de7e983e TG |
1262 | if (streq(subsystem, "drivers")) { |
1263 | /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem | |
1264 | * encoded as well */ | |
1265 | r = asprintf(&id, "+drivers:%s:%s", device->driver_subsystem, sysname); | |
1266 | if (r < 0) | |
1267 | return -ENOMEM; | |
1268 | } else { | |
1269 | r = asprintf(&id, "+%s:%s", subsystem, sysname); | |
1270 | if (r < 0) | |
1271 | return -ENOMEM; | |
1272 | } | |
57fa1d09 TG |
1273 | } |
1274 | ||
ae2a15bc | 1275 | device->id_filename = TAKE_PTR(id); |
57fa1d09 TG |
1276 | } |
1277 | ||
1278 | *ret = device->id_filename; | |
1279 | ||
1280 | return 0; | |
1281 | } | |
1282 | ||
107f2e25 | 1283 | int device_read_db_aux(sd_device *device, bool force) { |
57fa1d09 TG |
1284 | _cleanup_free_ char *db = NULL; |
1285 | char *path; | |
1286 | const char *id, *value; | |
1287 | char key; | |
1288 | size_t db_len; | |
1289 | unsigned i; | |
1290 | int r; | |
1291 | ||
1292 | enum { | |
1293 | PRE_KEY, | |
1294 | KEY, | |
1295 | PRE_VALUE, | |
1296 | VALUE, | |
1297 | INVALID_LINE, | |
1298 | } state = PRE_KEY; | |
1299 | ||
107f2e25 | 1300 | if (device->db_loaded || (!force && device->sealed)) |
57fa1d09 TG |
1301 | return 0; |
1302 | ||
7141e4f6 TG |
1303 | device->db_loaded = true; |
1304 | ||
57fa1d09 TG |
1305 | r = device_get_id_filename(device, &id); |
1306 | if (r < 0) | |
1307 | return r; | |
1308 | ||
1309 | path = strjoina("/run/udev/data/", id); | |
1310 | ||
1311 | r = read_full_file(path, &db, &db_len); | |
1312 | if (r < 0) { | |
1313 | if (r == -ENOENT) | |
1314 | return 0; | |
e53fc357 LP |
1315 | else |
1316 | return log_debug_errno(r, "sd-device: failed to read db '%s': %m", path); | |
57fa1d09 TG |
1317 | } |
1318 | ||
1319 | /* devices with a database entry are initialized */ | |
7e518afa | 1320 | device->is_initialized = true; |
57fa1d09 TG |
1321 | |
1322 | for (i = 0; i < db_len; i++) { | |
1323 | switch (state) { | |
1324 | case PRE_KEY: | |
1325 | if (!strchr(NEWLINE, db[i])) { | |
1326 | key = db[i]; | |
1327 | ||
1328 | state = KEY; | |
1329 | } | |
1330 | ||
1331 | break; | |
1332 | case KEY: | |
1333 | if (db[i] != ':') { | |
1334 | log_debug("sd-device: ignoring invalid db entry with key '%c'", key); | |
1335 | ||
1336 | state = INVALID_LINE; | |
1337 | } else { | |
1338 | db[i] = '\0'; | |
1339 | ||
1340 | state = PRE_VALUE; | |
1341 | } | |
1342 | ||
1343 | break; | |
1344 | case PRE_VALUE: | |
1345 | value = &db[i]; | |
1346 | ||
1347 | state = VALUE; | |
1348 | ||
1349 | break; | |
1350 | case INVALID_LINE: | |
1351 | if (strchr(NEWLINE, db[i])) | |
1352 | state = PRE_KEY; | |
1353 | ||
1354 | break; | |
1355 | case VALUE: | |
1356 | if (strchr(NEWLINE, db[i])) { | |
1357 | db[i] = '\0'; | |
1358 | r = handle_db_line(device, key, value); | |
1359 | if (r < 0) | |
19c29853 | 1360 | log_debug_errno(r, "sd-device: failed to handle db entry '%c:%s': %m", key, value); |
57fa1d09 TG |
1361 | |
1362 | state = PRE_KEY; | |
1363 | } | |
1364 | ||
1365 | break; | |
1366 | default: | |
1367 | assert_not_reached("invalid state when parsing db"); | |
1368 | } | |
1369 | } | |
1370 | ||
57fa1d09 TG |
1371 | return 0; |
1372 | } | |
1373 | ||
107f2e25 TG |
1374 | static int device_read_db(sd_device *device) { |
1375 | return device_read_db_aux(device, false); | |
1376 | } | |
1377 | ||
57fa1d09 TG |
1378 | _public_ int sd_device_get_is_initialized(sd_device *device, int *initialized) { |
1379 | int r; | |
1380 | ||
1381 | assert_return(device, -EINVAL); | |
1382 | assert_return(initialized, -EINVAL); | |
1383 | ||
1384 | r = device_read_db(device); | |
1385 | if (r < 0) | |
1386 | return r; | |
1387 | ||
1388 | *initialized = device->is_initialized; | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) { | |
1394 | usec_t now_ts; | |
1395 | int r; | |
1396 | ||
1397 | assert_return(device, -EINVAL); | |
1398 | assert_return(usec, -EINVAL); | |
1399 | ||
1400 | r = device_read_db(device); | |
1401 | if (r < 0) | |
1402 | return r; | |
1403 | ||
1404 | if (!device->is_initialized) | |
1405 | return -EBUSY; | |
1406 | ||
1407 | if (!device->usec_initialized) | |
1408 | return -ENODATA; | |
1409 | ||
1410 | now_ts = now(clock_boottime_or_monotonic()); | |
1411 | ||
1412 | if (now_ts < device->usec_initialized) | |
1413 | return -EIO; | |
1414 | ||
1415 | *usec = now_ts - device->usec_initialized; | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1421 | void *v; |
1422 | ||
57fa1d09 TG |
1423 | assert_return(device, NULL); |
1424 | ||
1425 | (void) device_read_db(device); | |
1426 | ||
1427 | device->tags_iterator_generation = device->tags_generation; | |
1428 | device->tags_iterator = ITERATOR_FIRST; | |
1429 | ||
bccfe92e | 1430 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1431 | return v; |
57fa1d09 TG |
1432 | } |
1433 | ||
1434 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1435 | void *v; |
1436 | ||
57fa1d09 TG |
1437 | assert_return(device, NULL); |
1438 | ||
1439 | (void) device_read_db(device); | |
1440 | ||
1441 | if (device->tags_iterator_generation != device->tags_generation) | |
1442 | return NULL; | |
1443 | ||
bccfe92e | 1444 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1445 | return v; |
57fa1d09 TG |
1446 | } |
1447 | ||
1448 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1449 | void *v; |
1450 | ||
57fa1d09 TG |
1451 | assert_return(device, NULL); |
1452 | ||
1453 | (void) device_read_db(device); | |
1454 | ||
1455 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1456 | device->devlinks_iterator = ITERATOR_FIRST; | |
1457 | ||
bccfe92e | 1458 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1459 | return v; |
57fa1d09 TG |
1460 | } |
1461 | ||
1462 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1463 | void *v; |
1464 | ||
57fa1d09 TG |
1465 | assert_return(device, NULL); |
1466 | ||
1467 | (void) device_read_db(device); | |
1468 | ||
1469 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1470 | return NULL; | |
1471 | ||
bccfe92e | 1472 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1473 | return v; |
57fa1d09 TG |
1474 | } |
1475 | ||
1476 | static int device_properties_prepare(sd_device *device) { | |
1477 | int r; | |
1478 | ||
1479 | assert(device); | |
1480 | ||
1481 | r = device_read_uevent_file(device); | |
1482 | if (r < 0) | |
1483 | return r; | |
1484 | ||
1485 | r = device_read_db(device); | |
1486 | if (r < 0) | |
1487 | return r; | |
1488 | ||
1489 | if (device->property_devlinks_outdated) { | |
1d88a271 MP |
1490 | _cleanup_free_ char *devlinks = NULL; |
1491 | size_t devlinks_allocated = 0, devlinks_len = 0; | |
57fa1d09 TG |
1492 | const char *devlink; |
1493 | ||
1d88a271 MP |
1494 | for (devlink = sd_device_get_devlink_first(device); devlink; devlink = sd_device_get_devlink_next(device)) { |
1495 | char *e; | |
57fa1d09 | 1496 | |
1d88a271 MP |
1497 | if (!GREEDY_REALLOC(devlinks, devlinks_allocated, devlinks_len + strlen(devlink) + 2)) |
1498 | return -ENOMEM; | |
1499 | if (devlinks_len > 0) | |
1500 | stpcpy(devlinks + devlinks_len++, " "); | |
1501 | e = stpcpy(devlinks + devlinks_len, devlink); | |
1502 | devlinks_len = e - devlinks; | |
1503 | } | |
57fa1d09 TG |
1504 | |
1505 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1506 | if (r < 0) | |
1507 | return r; | |
1508 | ||
1509 | device->property_devlinks_outdated = false; | |
1510 | } | |
1511 | ||
1512 | if (device->property_tags_outdated) { | |
1d88a271 MP |
1513 | _cleanup_free_ char *tags = NULL; |
1514 | size_t tags_allocated = 0, tags_len = 0; | |
57fa1d09 TG |
1515 | const char *tag; |
1516 | ||
1d88a271 MP |
1517 | if (!GREEDY_REALLOC(tags, tags_allocated, 2)) |
1518 | return -ENOMEM; | |
1519 | stpcpy(tags, ":"); | |
1520 | tags_len++; | |
57fa1d09 | 1521 | |
1d88a271 MP |
1522 | for (tag = sd_device_get_tag_first(device); tag; tag = sd_device_get_tag_next(device)) { |
1523 | char *e; | |
57fa1d09 | 1524 | |
817ec8cc | 1525 | if (!GREEDY_REALLOC(tags, tags_allocated, tags_len + strlen(tag) + 2)) |
1d88a271 MP |
1526 | return -ENOMEM; |
1527 | e = stpcpy(stpcpy(tags + tags_len, tag), ":"); | |
1528 | tags_len = e - tags; | |
1529 | } | |
57fa1d09 TG |
1530 | |
1531 | r = device_add_property_internal(device, "TAGS", tags); | |
1532 | if (r < 0) | |
1533 | return r; | |
1534 | ||
1535 | device->property_tags_outdated = false; | |
1536 | } | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
1541 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
1542 | const char *key; | |
1543 | const char *value; | |
1544 | int r; | |
1545 | ||
1546 | assert_return(device, NULL); | |
1547 | ||
1548 | r = device_properties_prepare(device); | |
1549 | if (r < 0) | |
1550 | return NULL; | |
1551 | ||
1552 | device->properties_iterator_generation = device->properties_generation; | |
1553 | device->properties_iterator = ITERATOR_FIRST; | |
1554 | ||
8927b1da | 1555 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1556 | |
1557 | if (_value) | |
1558 | *_value = value; | |
1559 | ||
1560 | return key; | |
1561 | } | |
1562 | ||
1563 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
1564 | const char *key; | |
1565 | const char *value; | |
1566 | int r; | |
1567 | ||
1568 | assert_return(device, NULL); | |
1569 | ||
1570 | r = device_properties_prepare(device); | |
1571 | if (r < 0) | |
1572 | return NULL; | |
1573 | ||
1574 | if (device->properties_iterator_generation != device->properties_generation) | |
1575 | return NULL; | |
1576 | ||
8927b1da | 1577 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1578 | |
1579 | if (_value) | |
1580 | *_value = value; | |
1581 | ||
1582 | return key; | |
1583 | } | |
1584 | ||
1585 | static int device_sysattrs_read_all(sd_device *device) { | |
1586 | _cleanup_closedir_ DIR *dir = NULL; | |
1587 | const char *syspath; | |
1588 | struct dirent *dent; | |
1589 | int r; | |
1590 | ||
1591 | assert(device); | |
1592 | ||
1593 | if (device->sysattrs_read) | |
1594 | return 0; | |
1595 | ||
1596 | r = sd_device_get_syspath(device, &syspath); | |
1597 | if (r < 0) | |
1598 | return r; | |
1599 | ||
1600 | dir = opendir(syspath); | |
1601 | if (!dir) | |
1602 | return -errno; | |
1603 | ||
1604 | r = set_ensure_allocated(&device->sysattrs, &string_hash_ops); | |
1605 | if (r < 0) | |
1606 | return r; | |
1607 | ||
8fb3f009 | 1608 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
57fa1d09 TG |
1609 | char *path; |
1610 | struct stat statbuf; | |
1611 | ||
1612 | /* only handle symlinks and regular files */ | |
945c2931 | 1613 | if (!IN_SET(dent->d_type, DT_LNK, DT_REG)) |
57fa1d09 TG |
1614 | continue; |
1615 | ||
1616 | path = strjoina(syspath, "/", dent->d_name); | |
1617 | ||
1618 | if (lstat(path, &statbuf) != 0) | |
1619 | continue; | |
1620 | ||
1621 | if (!(statbuf.st_mode & S_IRUSR)) | |
1622 | continue; | |
1623 | ||
1624 | r = set_put_strdup(device->sysattrs, dent->d_name); | |
1625 | if (r < 0) | |
1626 | return r; | |
1627 | } | |
1628 | ||
1629 | device->sysattrs_read = true; | |
1630 | ||
1631 | return 0; | |
1632 | } | |
1633 | ||
1634 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 1635 | void *v; |
57fa1d09 TG |
1636 | int r; |
1637 | ||
1638 | assert_return(device, NULL); | |
1639 | ||
1640 | if (!device->sysattrs_read) { | |
1641 | r = device_sysattrs_read_all(device); | |
1642 | if (r < 0) { | |
1643 | errno = -r; | |
1644 | return NULL; | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | device->sysattrs_iterator = ITERATOR_FIRST; | |
1649 | ||
bccfe92e | 1650 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1651 | return v; |
57fa1d09 TG |
1652 | } |
1653 | ||
1654 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
1655 | void *v; |
1656 | ||
57fa1d09 TG |
1657 | assert_return(device, NULL); |
1658 | ||
1659 | if (!device->sysattrs_read) | |
1660 | return NULL; | |
1661 | ||
bccfe92e | 1662 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1663 | return v; |
57fa1d09 TG |
1664 | } |
1665 | ||
1666 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
1667 | assert_return(device, -EINVAL); | |
1668 | assert_return(tag, -EINVAL); | |
1669 | ||
1670 | (void) device_read_db(device); | |
1671 | ||
1672 | return !!set_contains(device->tags, tag); | |
1673 | } | |
1674 | ||
1675 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) { | |
1676 | char *value; | |
1677 | int r; | |
1678 | ||
1679 | assert_return(device, -EINVAL); | |
1680 | assert_return(key, -EINVAL); | |
1681 | assert_return(_value, -EINVAL); | |
1682 | ||
1683 | r = device_properties_prepare(device); | |
1684 | if (r < 0) | |
1685 | return r; | |
1686 | ||
1687 | value = ordered_hashmap_get(device->properties, key); | |
1688 | if (!value) | |
1689 | return -ENOENT; | |
1690 | ||
1691 | *_value = value; | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | /* replaces the value if it already exists */ | |
2fe29a46 | 1697 | static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) { |
57fa1d09 | 1698 | _cleanup_free_ char *key = NULL; |
2fe29a46 | 1699 | _cleanup_free_ char *value_old = NULL; |
57fa1d09 TG |
1700 | int r; |
1701 | ||
1702 | assert(device); | |
1703 | assert(_key); | |
1704 | ||
1705 | r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops); | |
1706 | if (r < 0) | |
1707 | return r; | |
1708 | ||
2fe29a46 | 1709 | value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key); |
57fa1d09 TG |
1710 | if (!key) { |
1711 | key = strdup(_key); | |
1712 | if (!key) | |
1713 | return -ENOMEM; | |
1714 | } | |
1715 | ||
57fa1d09 TG |
1716 | r = hashmap_put(device->sysattr_values, key, value); |
1717 | if (r < 0) | |
1718 | return r; | |
1719 | ||
1720 | key = NULL; | |
57fa1d09 TG |
1721 | |
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) { | |
1726 | const char *key = NULL, *value; | |
1727 | ||
1728 | assert(device); | |
1729 | assert(_key); | |
1730 | ||
1731 | value = hashmap_get2(device->sysattr_values, _key, (void **) &key); | |
1732 | if (!key) | |
1733 | return -ENOENT; | |
1734 | ||
1735 | if (_value) | |
1736 | *_value = value; | |
1737 | ||
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
1742 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
1743 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) { | |
1744 | _cleanup_free_ char *value = NULL; | |
1745 | const char *syspath, *cached_value = NULL; | |
1746 | char *path; | |
1747 | struct stat statbuf; | |
1748 | int r; | |
1749 | ||
1750 | assert_return(device, -EINVAL); | |
1751 | assert_return(sysattr, -EINVAL); | |
1752 | ||
1753 | /* look for possibly already cached result */ | |
1754 | r = device_get_sysattr_value(device, sysattr, &cached_value); | |
1755 | if (r != -ENOENT) { | |
1756 | if (r < 0) | |
1757 | return r; | |
1758 | ||
1759 | if (!cached_value) | |
1760 | /* we looked up the sysattr before and it did not exist */ | |
1761 | return -ENOENT; | |
1762 | ||
1763 | if (_value) | |
1764 | *_value = cached_value; | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | r = sd_device_get_syspath(device, &syspath); | |
1770 | if (r < 0) | |
1771 | return r; | |
1772 | ||
1773 | path = strjoina(syspath, "/", sysattr); | |
1774 | r = lstat(path, &statbuf); | |
1775 | if (r < 0) { | |
1776 | /* remember that we could not access the sysattr */ | |
1777 | r = device_add_sysattr_value(device, sysattr, NULL); | |
1778 | if (r < 0) | |
1779 | return r; | |
1780 | ||
1781 | return -ENOENT; | |
1782 | } else if (S_ISLNK(statbuf.st_mode)) { | |
1783 | /* Some core links return only the last element of the target path, | |
1784 | * these are just values, the paths should not be exposed. */ | |
1785 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
1786 | r = readlink_value(path, &value); | |
1787 | if (r < 0) | |
1788 | return r; | |
1789 | } else | |
1790 | return -EINVAL; | |
1791 | } else if (S_ISDIR(statbuf.st_mode)) { | |
1792 | /* skip directories */ | |
1793 | return -EINVAL; | |
1794 | } else if (!(statbuf.st_mode & S_IRUSR)) { | |
1795 | /* skip non-readable files */ | |
1796 | return -EPERM; | |
1797 | } else { | |
1798 | size_t size; | |
1799 | ||
1800 | /* read attribute value */ | |
1801 | r = read_full_file(path, &value, &size); | |
1802 | if (r < 0) | |
1803 | return r; | |
1804 | ||
1805 | /* drop trailing newlines */ | |
1806 | while (size > 0 && value[--size] == '\n') | |
1807 | value[size] = '\0'; | |
1808 | } | |
1809 | ||
1810 | r = device_add_sysattr_value(device, sysattr, value); | |
1811 | if (r < 0) | |
1812 | return r; | |
1813 | ||
1cc6c93a | 1814 | *_value = TAKE_PTR(value); |
57fa1d09 TG |
1815 | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | static void device_remove_sysattr_value(sd_device *device, const char *_key) { | |
1820 | _cleanup_free_ char *key = NULL; | |
1821 | _cleanup_free_ char *value = NULL; | |
1822 | ||
1823 | assert(device); | |
1824 | assert(_key); | |
1825 | ||
1826 | value = hashmap_remove2(device->sysattr_values, _key, (void **) &key); | |
1827 | ||
1828 | return; | |
1829 | } | |
1830 | ||
1831 | /* set the attribute and save it in the cache. If a NULL value is passed the | |
1832 | * attribute is cleared from the cache */ | |
8aae9a66 | 1833 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, const char *_value) { |
57fa1d09 | 1834 | _cleanup_close_ int fd = -1; |
2fe29a46 | 1835 | _cleanup_free_ char *value = NULL; |
57fa1d09 TG |
1836 | const char *syspath; |
1837 | char *path; | |
2fa4861a | 1838 | size_t len = 0; |
57fa1d09 TG |
1839 | ssize_t size; |
1840 | int r; | |
1841 | ||
1842 | assert_return(device, -EINVAL); | |
1843 | assert_return(sysattr, -EINVAL); | |
1844 | ||
2fe29a46 | 1845 | if (!_value) { |
57fa1d09 TG |
1846 | device_remove_sysattr_value(device, sysattr); |
1847 | ||
1848 | return 0; | |
1849 | } | |
1850 | ||
1851 | r = sd_device_get_syspath(device, &syspath); | |
1852 | if (r < 0) | |
1853 | return r; | |
1854 | ||
1855 | path = strjoina(syspath, "/", sysattr); | |
2fa4861a ZJS |
1856 | |
1857 | fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); | |
1858 | if (fd < 0) { | |
1859 | if (errno == ELOOP) | |
1860 | return -EINVAL; | |
1861 | if (errno == EISDIR) | |
1862 | return -EISDIR; | |
1863 | ||
2fe29a46 TG |
1864 | value = strdup(""); |
1865 | if (!value) | |
1866 | return -ENOMEM; | |
1867 | ||
1868 | r = device_add_sysattr_value(device, sysattr, value); | |
57fa1d09 TG |
1869 | if (r < 0) |
1870 | return r; | |
3bd82598 | 1871 | value = NULL; |
57fa1d09 TG |
1872 | |
1873 | return -ENXIO; | |
1874 | } | |
1875 | ||
2fa4861a | 1876 | len = strlen(_value); |
57fa1d09 TG |
1877 | |
1878 | /* drop trailing newlines */ | |
2fa4861a ZJS |
1879 | while (len > 0 && _value[len - 1] == '\n') |
1880 | len --; | |
57fa1d09 TG |
1881 | |
1882 | /* value length is limited to 4k */ | |
2fa4861a | 1883 | if (len > 4096) |
57fa1d09 TG |
1884 | return -EINVAL; |
1885 | ||
2fa4861a | 1886 | value = strndup(_value, len); |
2fe29a46 TG |
1887 | if (!value) |
1888 | return -ENOMEM; | |
1889 | ||
2fa4861a | 1890 | size = write(fd, value, len); |
57fa1d09 TG |
1891 | if (size < 0) |
1892 | return -errno; | |
1893 | ||
2fa4861a | 1894 | if ((size_t)size != len) |
57fa1d09 TG |
1895 | return -EIO; |
1896 | ||
1897 | r = device_add_sysattr_value(device, sysattr, value); | |
1898 | if (r < 0) | |
1899 | return r; | |
2fe29a46 TG |
1900 | value = NULL; |
1901 | ||
57fa1d09 TG |
1902 | return 0; |
1903 | } |