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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, | |
dcfbde3a YW |
41 | .devmode = (mode_t) -1, |
42 | .devuid = (uid_t) -1, | |
43 | .devgid = (gid_t) -1, | |
6116d2b2 | 44 | }; |
57fa1d09 TG |
45 | |
46 | *ret = device; | |
57fa1d09 TG |
47 | return 0; |
48 | } | |
49 | ||
8301aa0b YW |
50 | static sd_device *device_free(sd_device *device) { |
51 | assert(device); | |
57fa1d09 | 52 | |
8301aa0b YW |
53 | sd_device_unref(device->parent); |
54 | free(device->syspath); | |
55 | free(device->sysname); | |
56 | free(device->devtype); | |
57 | free(device->devname); | |
58 | free(device->subsystem); | |
59 | free(device->driver_subsystem); | |
60 | free(device->driver); | |
61 | free(device->id_filename); | |
62 | free(device->properties_strv); | |
63 | free(device->properties_nulstr); | |
64 | ||
65 | ordered_hashmap_free_free_free(device->properties); | |
66 | ordered_hashmap_free_free_free(device->properties_db); | |
67 | hashmap_free_free_free(device->sysattr_values); | |
68 | set_free_free(device->sysattrs); | |
69 | set_free_free(device->tags); | |
70 | set_free_free(device->devlinks); | |
71 | ||
72 | return mfree(device); | |
57fa1d09 TG |
73 | } |
74 | ||
8301aa0b | 75 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device, sd_device, device_free); |
57fa1d09 TG |
76 | |
77 | int device_add_property_aux(sd_device *device, const char *_key, const char *_value, bool db) { | |
78 | OrderedHashmap **properties; | |
79 | ||
80 | assert(device); | |
81 | assert(_key); | |
82 | ||
83 | if (db) | |
84 | properties = &device->properties_db; | |
85 | else | |
86 | properties = &device->properties; | |
87 | ||
88 | if (_value) { | |
89 | _cleanup_free_ char *key = NULL, *value = NULL, *old_key = NULL, *old_value = NULL; | |
90 | int r; | |
91 | ||
92 | r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops); | |
93 | if (r < 0) | |
94 | return r; | |
95 | ||
96 | key = strdup(_key); | |
97 | if (!key) | |
98 | return -ENOMEM; | |
99 | ||
100 | value = strdup(_value); | |
101 | if (!value) | |
102 | return -ENOMEM; | |
103 | ||
104 | old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key); | |
105 | ||
106 | r = ordered_hashmap_replace(*properties, key, value); | |
107 | if (r < 0) | |
108 | return r; | |
109 | ||
110 | key = NULL; | |
111 | value = NULL; | |
112 | } else { | |
113 | _cleanup_free_ char *key = NULL; | |
114 | _cleanup_free_ char *value = NULL; | |
115 | ||
116 | value = ordered_hashmap_remove2(*properties, _key, (void**) &key); | |
117 | } | |
118 | ||
119 | if (!db) { | |
313cefa1 | 120 | device->properties_generation++; |
57fa1d09 TG |
121 | device->properties_buf_outdated = true; |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | int device_add_property_internal(sd_device *device, const char *key, const char *value) { | |
128 | return device_add_property_aux(device, key, value, false); | |
129 | } | |
130 | ||
131 | int device_set_syspath(sd_device *device, const char *_syspath, bool verify) { | |
132 | _cleanup_free_ char *syspath = NULL; | |
133 | const char *devpath; | |
134 | int r; | |
135 | ||
136 | assert(device); | |
137 | assert(_syspath); | |
138 | ||
139 | /* must be a subdirectory of /sys */ | |
140 | if (!path_startswith(_syspath, "/sys/")) { | |
c7d54dae | 141 | log_debug("sd-device: Syspath '%s' is not a subdirectory of /sys", _syspath); |
57fa1d09 TG |
142 | return -EINVAL; |
143 | } | |
144 | ||
145 | if (verify) { | |
5bbe8eab | 146 | r = chase_symlinks(_syspath, NULL, 0, &syspath); |
08232a02 | 147 | if (r == -ENOENT) |
d89e0dc8 LP |
148 | return -ENODEV; /* the device does not exist (any more?) */ |
149 | if (r < 0) | |
c7d54dae | 150 | return log_debug_errno(r, "sd-device: Failed to get target of '%s': %m", _syspath); |
57fa1d09 | 151 | |
2e1ec12e YW |
152 | if (!path_startswith(syspath, "/sys")) { |
153 | _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL; | |
154 | char *p; | |
155 | ||
156 | /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */ | |
157 | r = chase_symlinks("/sys", NULL, 0, &real_sys); | |
158 | if (r < 0) | |
c7d54dae | 159 | return log_debug_errno(r, "sd-device: Failed to chase symlink /sys: %m"); |
2e1ec12e YW |
160 | |
161 | p = path_startswith(syspath, real_sys); | |
162 | if (!p) { | |
c7d54dae | 163 | log_debug("sd-device: Canonicalized path '%s' does not starts with sysfs mount point '%s'", syspath, real_sys); |
2e1ec12e YW |
164 | return -ENODEV; |
165 | } | |
166 | ||
167 | new_syspath = strjoin("/sys/", p); | |
168 | if (!new_syspath) | |
c7d54dae | 169 | return -ENOMEM; |
2e1ec12e YW |
170 | |
171 | free_and_replace(syspath, new_syspath); | |
858d36c1 | 172 | path_simplify(syspath, false); |
2e1ec12e YW |
173 | } |
174 | ||
57fa1d09 TG |
175 | if (path_startswith(syspath, "/sys/devices/")) { |
176 | char *path; | |
177 | ||
178 | /* all 'devices' require an 'uevent' file */ | |
179 | path = strjoina(syspath, "/uevent"); | |
180 | r = access(path, F_OK); | |
181 | if (r < 0) { | |
52d62901 TG |
182 | if (errno == ENOENT) |
183 | /* this is not a valid device */ | |
184 | return -ENODEV; | |
185 | ||
25f027c5 | 186 | return log_debug_errno(errno, "sd-device: %s does not have an uevent file: %m", syspath); |
57fa1d09 TG |
187 | } |
188 | } else { | |
61233823 | 189 | /* everything else just needs to be a directory */ |
52d62901 TG |
190 | if (!is_dir(syspath, false)) |
191 | return -ENODEV; | |
57fa1d09 TG |
192 | } |
193 | } else { | |
194 | syspath = strdup(_syspath); | |
195 | if (!syspath) | |
196 | return -ENOMEM; | |
197 | } | |
198 | ||
fbd0b64f | 199 | devpath = syspath + STRLEN("/sys"); |
57fa1d09 TG |
200 | |
201 | r = device_add_property_internal(device, "DEVPATH", devpath); | |
202 | if (r < 0) | |
203 | return r; | |
204 | ||
f9ecfd3b | 205 | free_and_replace(device->syspath, syspath); |
57fa1d09 TG |
206 | |
207 | device->devpath = devpath; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { | |
4afd3348 | 213 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
214 | int r; |
215 | ||
216 | assert_return(ret, -EINVAL); | |
217 | assert_return(syspath, -EINVAL); | |
218 | ||
219 | r = device_new_aux(&device); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | r = device_set_syspath(device, syspath, true); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
1cc6c93a | 227 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
232 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
233 | char *syspath; | |
234 | char id[DECIMAL_STR_MAX(unsigned) * 2 + 1]; | |
235 | ||
236 | assert_return(ret, -EINVAL); | |
945c2931 | 237 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); |
57fa1d09 TG |
238 | |
239 | /* use /sys/dev/{block,char}/<maj>:<min> link */ | |
240 | snprintf(id, sizeof(id), "%u:%u", major(devnum), minor(devnum)); | |
241 | ||
242 | syspath = strjoina("/sys/dev/", (type == 'b' ? "block" : "char"), "/", id); | |
243 | ||
244 | return sd_device_new_from_syspath(ret, syspath); | |
245 | } | |
246 | ||
247 | _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) { | |
21d6220f TG |
248 | char *name, *syspath; |
249 | size_t len = 0; | |
57fa1d09 TG |
250 | |
251 | assert_return(ret, -EINVAL); | |
252 | assert_return(subsystem, -EINVAL); | |
253 | assert_return(sysname, -EINVAL); | |
254 | ||
255 | if (streq(subsystem, "subsystem")) { | |
256 | syspath = strjoina("/sys/subsystem/", sysname); | |
257 | if (access(syspath, F_OK) >= 0) | |
258 | return sd_device_new_from_syspath(ret, syspath); | |
259 | ||
260 | syspath = strjoina("/sys/bus/", sysname); | |
261 | if (access(syspath, F_OK) >= 0) | |
262 | return sd_device_new_from_syspath(ret, syspath); | |
263 | ||
264 | syspath = strjoina("/sys/class/", sysname); | |
265 | if (access(syspath, F_OK) >= 0) | |
266 | return sd_device_new_from_syspath(ret, syspath); | |
267 | } else if (streq(subsystem, "module")) { | |
268 | syspath = strjoina("/sys/module/", sysname); | |
269 | if (access(syspath, F_OK) >= 0) | |
270 | return sd_device_new_from_syspath(ret, syspath); | |
271 | } else if (streq(subsystem, "drivers")) { | |
272 | char subsys[PATH_MAX]; | |
273 | char *driver; | |
274 | ||
275 | strscpy(subsys, sizeof(subsys), sysname); | |
276 | driver = strchr(subsys, ':'); | |
277 | if (driver) { | |
278 | driver[0] = '\0'; | |
279 | driver++; | |
280 | ||
281 | syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver); | |
282 | if (access(syspath, F_OK) >= 0) | |
283 | return sd_device_new_from_syspath(ret, syspath); | |
284 | ||
285 | syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver); | |
286 | if (access(syspath, F_OK) >= 0) | |
287 | return sd_device_new_from_syspath(ret, syspath); | |
21d6220f TG |
288 | } |
289 | } | |
a9ec9f29 | 290 | |
21d6220f TG |
291 | /* translate sysname back to sysfs filename */ |
292 | name = strdupa(sysname); | |
293 | while (name[len] != '\0') { | |
294 | if (name[len] == '/') | |
295 | name[len] = '!'; | |
a9ec9f29 | 296 | |
21d6220f TG |
297 | len++; |
298 | } | |
a9ec9f29 | 299 | |
21d6220f TG |
300 | syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name); |
301 | if (access(syspath, F_OK) >= 0) | |
302 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 303 | |
21d6220f TG |
304 | syspath = strjoina("/sys/bus/", subsystem, "/devices/", name); |
305 | if (access(syspath, F_OK) >= 0) | |
306 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 307 | |
21d6220f TG |
308 | syspath = strjoina("/sys/class/", subsystem, "/", name); |
309 | if (access(syspath, F_OK) >= 0) | |
310 | return sd_device_new_from_syspath(ret, syspath); | |
57fa1d09 | 311 | |
a918b673 PK |
312 | syspath = strjoina("/sys/firmware/", subsystem, "/", sysname); |
313 | if (access(syspath, F_OK) >= 0) | |
314 | return sd_device_new_from_syspath(ret, syspath); | |
315 | ||
08232a02 | 316 | return -ENODEV; |
57fa1d09 TG |
317 | } |
318 | ||
319 | int device_set_devtype(sd_device *device, const char *_devtype) { | |
320 | _cleanup_free_ char *devtype = NULL; | |
321 | int r; | |
322 | ||
323 | assert(device); | |
324 | assert(_devtype); | |
325 | ||
326 | devtype = strdup(_devtype); | |
327 | if (!devtype) | |
328 | return -ENOMEM; | |
329 | ||
330 | r = device_add_property_internal(device, "DEVTYPE", devtype); | |
331 | if (r < 0) | |
332 | return r; | |
333 | ||
f9ecfd3b | 334 | free_and_replace(device->devtype, devtype); |
57fa1d09 TG |
335 | |
336 | return 0; | |
337 | } | |
338 | ||
339 | int device_set_ifindex(sd_device *device, const char *_ifindex) { | |
340 | int ifindex, r; | |
341 | ||
342 | assert(device); | |
343 | assert(_ifindex); | |
344 | ||
6ad623a3 | 345 | r = parse_ifindex(_ifindex, &ifindex); |
57fa1d09 TG |
346 | if (r < 0) |
347 | return r; | |
348 | ||
57fa1d09 TG |
349 | r = device_add_property_internal(device, "IFINDEX", _ifindex); |
350 | if (r < 0) | |
351 | return r; | |
352 | ||
353 | device->ifindex = ifindex; | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | int device_set_devname(sd_device *device, const char *_devname) { | |
359 | _cleanup_free_ char *devname = NULL; | |
360 | int r; | |
361 | ||
362 | assert(device); | |
363 | assert(_devname); | |
364 | ||
365 | if (_devname[0] != '/') { | |
366 | r = asprintf(&devname, "/dev/%s", _devname); | |
367 | if (r < 0) | |
368 | return -ENOMEM; | |
369 | } else { | |
370 | devname = strdup(_devname); | |
371 | if (!devname) | |
372 | return -ENOMEM; | |
373 | } | |
374 | ||
375 | r = device_add_property_internal(device, "DEVNAME", devname); | |
376 | if (r < 0) | |
377 | return r; | |
378 | ||
f9ecfd3b | 379 | free_and_replace(device->devname, devname); |
57fa1d09 TG |
380 | |
381 | return 0; | |
382 | } | |
383 | ||
384 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
385 | unsigned devmode; | |
386 | int r; | |
387 | ||
388 | assert(device); | |
389 | assert(_devmode); | |
390 | ||
391 | r = safe_atou(_devmode, &devmode); | |
392 | if (r < 0) | |
393 | return r; | |
394 | ||
395 | if (devmode > 07777) | |
396 | return -EINVAL; | |
397 | ||
398 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
399 | if (r < 0) | |
400 | return r; | |
401 | ||
402 | device->devmode = devmode; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
408 | unsigned maj = 0, min = 0; | |
409 | int r; | |
410 | ||
411 | assert(device); | |
412 | assert(major); | |
413 | ||
414 | r = safe_atou(major, &maj); | |
415 | if (r < 0) | |
416 | return r; | |
417 | if (!maj) | |
418 | return 0; | |
419 | ||
420 | if (minor) { | |
421 | r = safe_atou(minor, &min); | |
422 | if (r < 0) | |
423 | return r; | |
424 | } | |
425 | ||
426 | r = device_add_property_internal(device, "MAJOR", major); | |
427 | if (r < 0) | |
428 | return r; | |
429 | ||
430 | if (minor) { | |
431 | r = device_add_property_internal(device, "MINOR", minor); | |
432 | if (r < 0) | |
433 | return r; | |
434 | } | |
435 | ||
436 | device->devnum = makedev(maj, min); | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | static int handle_uevent_line(sd_device *device, const char *key, const char *value, const char **major, const char **minor) { | |
442 | int r; | |
443 | ||
444 | assert(device); | |
445 | assert(key); | |
446 | assert(value); | |
447 | assert(major); | |
448 | assert(minor); | |
449 | ||
450 | if (streq(key, "DEVTYPE")) { | |
451 | r = device_set_devtype(device, value); | |
452 | if (r < 0) | |
453 | return r; | |
454 | } else if (streq(key, "IFINDEX")) { | |
455 | r = device_set_ifindex(device, value); | |
456 | if (r < 0) | |
457 | return r; | |
458 | } else if (streq(key, "DEVNAME")) { | |
459 | r = device_set_devname(device, value); | |
460 | if (r < 0) | |
461 | return r; | |
462 | } else if (streq(key, "DEVMODE")) { | |
463 | r = device_set_devmode(device, value); | |
464 | if (r < 0) | |
465 | return r; | |
466 | } else if (streq(key, "MAJOR")) | |
467 | *major = value; | |
468 | else if (streq(key, "MINOR")) | |
469 | *minor = value; | |
470 | else { | |
471 | r = device_add_property_internal(device, key, value); | |
472 | if (r < 0) | |
473 | return r; | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | int device_read_uevent_file(sd_device *device) { | |
480 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 481 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
482 | char *path; |
483 | size_t uevent_len; | |
484 | unsigned i; | |
485 | int r; | |
486 | ||
487 | enum { | |
488 | PRE_KEY, | |
489 | KEY, | |
490 | PRE_VALUE, | |
491 | VALUE, | |
492 | INVALID_LINE, | |
493 | } state = PRE_KEY; | |
494 | ||
495 | assert(device); | |
496 | ||
497 | if (device->uevent_loaded || device->sealed) | |
498 | return 0; | |
499 | ||
7141e4f6 TG |
500 | device->uevent_loaded = true; |
501 | ||
57fa1d09 TG |
502 | r = sd_device_get_syspath(device, &syspath); |
503 | if (r < 0) | |
504 | return r; | |
505 | ||
506 | path = strjoina(syspath, "/uevent"); | |
507 | ||
508 | r = read_full_file(path, &uevent, &uevent_len); | |
bba06166 TG |
509 | if (r == -EACCES) |
510 | /* empty uevent files may be write-only */ | |
511 | return 0; | |
2a213740 TG |
512 | else if (r == -ENOENT) |
513 | /* some devices may not have uevent files, see set_syspath() */ | |
514 | return 0; | |
fc95c359 | 515 | else if (r < 0) |
c7d54dae | 516 | return log_device_debug_errno(device, r, "sd-device: Failed to read uevent file '%s': %m", path); |
57fa1d09 | 517 | |
755700bb | 518 | for (i = 0; i < uevent_len; i++) |
57fa1d09 TG |
519 | switch (state) { |
520 | case PRE_KEY: | |
521 | if (!strchr(NEWLINE, uevent[i])) { | |
522 | key = &uevent[i]; | |
523 | ||
524 | state = KEY; | |
525 | } | |
526 | ||
527 | break; | |
528 | case KEY: | |
529 | if (uevent[i] == '=') { | |
530 | uevent[i] = '\0'; | |
531 | ||
532 | state = PRE_VALUE; | |
533 | } else if (strchr(NEWLINE, uevent[i])) { | |
534 | uevent[i] = '\0'; | |
c7d54dae | 535 | log_device_debug(device, "sd-device: Invalid uevent line '%s', ignoring", key); |
57fa1d09 TG |
536 | |
537 | state = PRE_KEY; | |
538 | } | |
539 | ||
540 | break; | |
541 | case PRE_VALUE: | |
542 | value = &uevent[i]; | |
57fa1d09 TG |
543 | state = VALUE; |
544 | ||
4831981d | 545 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
546 | case VALUE: |
547 | if (strchr(NEWLINE, uevent[i])) { | |
548 | uevent[i] = '\0'; | |
549 | ||
550 | r = handle_uevent_line(device, key, value, &major, &minor); | |
551 | if (r < 0) | |
c7d54dae | 552 | log_device_debug_errno(device, r, "sd-device: Failed to handle uevent entry '%s=%s', ignoring: %m", key, value); |
57fa1d09 TG |
553 | |
554 | state = PRE_KEY; | |
555 | } | |
556 | ||
557 | break; | |
558 | default: | |
c7d54dae | 559 | assert_not_reached("Invalid state when parsing uevent file"); |
57fa1d09 | 560 | } |
57fa1d09 TG |
561 | |
562 | if (major) { | |
563 | r = device_set_devnum(device, major, minor); | |
564 | if (r < 0) | |
c7d54dae | 565 | log_device_debug_errno(device, r, "sd-device: Failed to set 'MAJOR=%s' or 'MINOR=%s' from '%s', ignoring: %m", major, minor, path); |
57fa1d09 TG |
566 | } |
567 | ||
57fa1d09 TG |
568 | return 0; |
569 | } | |
570 | ||
571 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
572 | int r; | |
573 | ||
574 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
575 | |
576 | r = device_read_uevent_file(device); | |
577 | if (r < 0) | |
578 | return r; | |
579 | ||
1dfa9607 | 580 | if (device->ifindex <= 0) |
dcfbde3a YW |
581 | return -ENOENT; |
582 | ||
78ffb476 YW |
583 | if (ifindex) |
584 | *ifindex = device->ifindex; | |
57fa1d09 TG |
585 | |
586 | return 0; | |
587 | } | |
588 | ||
589 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
590 | int r; | |
591 | ||
592 | assert_return(ret, -EINVAL); | |
593 | assert_return(id, -EINVAL); | |
594 | ||
595 | switch (id[0]) { | |
596 | case 'b': | |
597 | case 'c': | |
598 | { | |
599 | char type; | |
600 | int maj, min; | |
601 | ||
602 | r = sscanf(id, "%c%i:%i", &type, &maj, &min); | |
603 | if (r != 3) | |
604 | return -EINVAL; | |
605 | ||
606 | return sd_device_new_from_devnum(ret, type, makedev(maj, min)); | |
607 | } | |
608 | case 'n': | |
609 | { | |
4afd3348 | 610 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
611 | _cleanup_close_ int sk = -1; |
612 | struct ifreq ifr = {}; | |
613 | int ifindex; | |
614 | ||
6ad623a3 | 615 | r = parse_ifindex(&id[1], &ifr.ifr_ifindex); |
57fa1d09 TG |
616 | if (r < 0) |
617 | return r; | |
57fa1d09 | 618 | |
429b4350 | 619 | sk = socket_ioctl_fd(); |
57fa1d09 | 620 | if (sk < 0) |
429b4350 | 621 | return sk; |
57fa1d09 TG |
622 | |
623 | r = ioctl(sk, SIOCGIFNAME, &ifr); | |
624 | if (r < 0) | |
625 | return -errno; | |
626 | ||
627 | r = sd_device_new_from_subsystem_sysname(&device, "net", ifr.ifr_name); | |
628 | if (r < 0) | |
629 | return r; | |
630 | ||
631 | r = sd_device_get_ifindex(device, &ifindex); | |
632 | if (r < 0) | |
633 | return r; | |
634 | ||
08232a02 | 635 | /* this is racey, so we might end up with the wrong device */ |
57fa1d09 TG |
636 | if (ifr.ifr_ifindex != ifindex) |
637 | return -ENODEV; | |
638 | ||
1cc6c93a | 639 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
640 | |
641 | return 0; | |
642 | } | |
643 | case '+': | |
644 | { | |
645 | char subsys[PATH_MAX]; | |
646 | char *sysname; | |
647 | ||
db2f8a2e | 648 | (void) strscpy(subsys, sizeof(subsys), id + 1); |
57fa1d09 TG |
649 | sysname = strchr(subsys, ':'); |
650 | if (!sysname) | |
651 | return -EINVAL; | |
652 | ||
653 | sysname[0] = '\0'; | |
313cefa1 | 654 | sysname++; |
57fa1d09 TG |
655 | |
656 | return sd_device_new_from_subsystem_sysname(ret, subsys, sysname); | |
657 | } | |
658 | default: | |
659 | return -EINVAL; | |
660 | } | |
661 | } | |
662 | ||
663 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
664 | assert_return(device, -EINVAL); | |
665 | assert_return(ret, -EINVAL); | |
666 | ||
667 | assert(path_startswith(device->syspath, "/sys/")); | |
668 | ||
669 | *ret = device->syspath; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static int device_new_from_child(sd_device **ret, sd_device *child) { | |
675 | _cleanup_free_ char *path = NULL; | |
676 | const char *subdir, *syspath; | |
677 | int r; | |
678 | ||
679 | assert(ret); | |
680 | assert(child); | |
681 | ||
682 | r = sd_device_get_syspath(child, &syspath); | |
683 | if (r < 0) | |
684 | return r; | |
685 | ||
686 | path = strdup(syspath); | |
687 | if (!path) | |
688 | return -ENOMEM; | |
fbd0b64f | 689 | subdir = path + STRLEN("/sys"); |
57fa1d09 TG |
690 | |
691 | for (;;) { | |
692 | char *pos; | |
693 | ||
694 | pos = strrchr(subdir, '/'); | |
695 | if (!pos || pos < subdir + 2) | |
696 | break; | |
697 | ||
698 | *pos = '\0'; | |
699 | ||
700 | r = sd_device_new_from_syspath(ret, path); | |
701 | if (r < 0) | |
702 | continue; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
08232a02 | 707 | return -ENODEV; |
57fa1d09 TG |
708 | } |
709 | ||
710 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
711 | ||
712 | assert_return(ret, -EINVAL); | |
713 | assert_return(child, -EINVAL); | |
714 | ||
715 | if (!child->parent_set) { | |
716 | child->parent_set = true; | |
717 | ||
db2f8a2e | 718 | (void) device_new_from_child(&child->parent, child); |
57fa1d09 TG |
719 | } |
720 | ||
721 | if (!child->parent) | |
722 | return -ENOENT; | |
723 | ||
724 | *ret = child->parent; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | int device_set_subsystem(sd_device *device, const char *_subsystem) { | |
730 | _cleanup_free_ char *subsystem = NULL; | |
731 | int r; | |
732 | ||
733 | assert(device); | |
734 | assert(_subsystem); | |
735 | ||
736 | subsystem = strdup(_subsystem); | |
737 | if (!subsystem) | |
738 | return -ENOMEM; | |
739 | ||
740 | r = device_add_property_internal(device, "SUBSYSTEM", subsystem); | |
741 | if (r < 0) | |
742 | return r; | |
743 | ||
f9ecfd3b | 744 | free_and_replace(device->subsystem, subsystem); |
57fa1d09 TG |
745 | |
746 | device->subsystem_set = true; | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
de7e983e TG |
751 | static int device_set_drivers_subsystem(sd_device *device, const char *_subsystem) { |
752 | _cleanup_free_ char *subsystem = NULL; | |
753 | int r; | |
754 | ||
755 | assert(device); | |
756 | assert(_subsystem); | |
757 | assert(*_subsystem); | |
758 | ||
759 | subsystem = strdup(_subsystem); | |
760 | if (!subsystem) | |
761 | return -ENOMEM; | |
762 | ||
763 | r = device_set_subsystem(device, "drivers"); | |
764 | if (r < 0) | |
765 | return r; | |
766 | ||
f9ecfd3b | 767 | free_and_replace(device->driver_subsystem, subsystem); |
de7e983e TG |
768 | |
769 | return 0; | |
770 | } | |
771 | ||
57fa1d09 | 772 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
773 | const char *syspath, *drivers = NULL; |
774 | int r; | |
775 | ||
57fa1d09 TG |
776 | assert_return(ret, -EINVAL); |
777 | assert_return(device, -EINVAL); | |
778 | ||
de7e983e TG |
779 | r = sd_device_get_syspath(device, &syspath); |
780 | if (r < 0) | |
781 | return r; | |
782 | ||
57fa1d09 TG |
783 | if (!device->subsystem_set) { |
784 | _cleanup_free_ char *subsystem = NULL; | |
57fa1d09 | 785 | char *path; |
57fa1d09 TG |
786 | |
787 | /* read 'subsystem' link */ | |
57fa1d09 TG |
788 | path = strjoina(syspath, "/subsystem"); |
789 | r = readlink_value(path, &subsystem); | |
790 | if (r >= 0) | |
791 | r = device_set_subsystem(device, subsystem); | |
792 | /* use implicit names */ | |
793 | else if (path_startswith(device->devpath, "/module/")) | |
794 | r = device_set_subsystem(device, "module"); | |
de7e983e TG |
795 | else if (!(drivers = strstr(syspath, "/drivers/")) && |
796 | (path_startswith(device->devpath, "/subsystem/") || | |
797 | path_startswith(device->devpath, "/class/") || | |
798 | path_startswith(device->devpath, "/bus/"))) | |
57fa1d09 | 799 | r = device_set_subsystem(device, "subsystem"); |
4189708a | 800 | if (r < 0 && r != -ENOENT) |
c7d54dae | 801 | return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem for %s: %m", device->devpath); |
57fa1d09 TG |
802 | |
803 | device->subsystem_set = true; | |
de7e983e TG |
804 | } else if (!device->driver_subsystem_set) |
805 | drivers = strstr(syspath, "/drivers/"); | |
806 | ||
807 | if (!device->driver_subsystem_set) { | |
808 | if (drivers) { | |
809 | _cleanup_free_ char *subpath = NULL; | |
810 | ||
811 | subpath = strndup(syspath, drivers - syspath); | |
812 | if (!subpath) | |
813 | r = -ENOMEM; | |
814 | else { | |
815 | const char *subsys; | |
816 | ||
817 | subsys = strrchr(subpath, '/'); | |
818 | if (!subsys) | |
819 | r = -EINVAL; | |
820 | else | |
821 | r = device_set_drivers_subsystem(device, subsys + 1); | |
822 | } | |
823 | if (r < 0 && r != -ENOENT) | |
c7d54dae | 824 | return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem for driver %s: %m", device->devpath); |
de7e983e TG |
825 | } |
826 | ||
827 | device->driver_subsystem_set = true; | |
57fa1d09 TG |
828 | } |
829 | ||
bf4c113e DH |
830 | if (!device->subsystem) |
831 | return -ENOENT; | |
832 | ||
57fa1d09 TG |
833 | *ret = device->subsystem; |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
838 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
839 | int r; | |
840 | ||
841 | assert(devtype); | |
842 | assert(device); | |
843 | ||
844 | r = device_read_uevent_file(device); | |
845 | if (r < 0) | |
846 | return r; | |
847 | ||
dcfbde3a YW |
848 | if (!device->devtype) |
849 | return -ENOENT; | |
850 | ||
57fa1d09 TG |
851 | *devtype = device->devtype; |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
856 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
857 | sd_device *parent = NULL; | |
858 | int r; | |
859 | ||
860 | assert_return(child, -EINVAL); | |
861 | assert_return(subsystem, -EINVAL); | |
862 | ||
863 | r = sd_device_get_parent(child, &parent); | |
864 | while (r >= 0) { | |
865 | const char *parent_subsystem = NULL; | |
866 | const char *parent_devtype = NULL; | |
867 | ||
db2f8a2e | 868 | (void) sd_device_get_subsystem(parent, &parent_subsystem); |
57fa1d09 TG |
869 | if (streq_ptr(parent_subsystem, subsystem)) { |
870 | if (!devtype) | |
871 | break; | |
872 | ||
db2f8a2e | 873 | (void) sd_device_get_devtype(parent, &parent_devtype); |
57fa1d09 TG |
874 | if (streq_ptr(parent_devtype, devtype)) |
875 | break; | |
876 | } | |
877 | r = sd_device_get_parent(parent, &parent); | |
878 | } | |
879 | ||
880 | if (r < 0) | |
881 | return r; | |
882 | ||
883 | *ret = parent; | |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
888 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
889 | int r; | |
890 | ||
891 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
892 | |
893 | r = device_read_uevent_file(device); | |
894 | if (r < 0) | |
895 | return r; | |
896 | ||
dcfbde3a YW |
897 | if (major(device->devnum) <= 0) |
898 | return -ENOENT; | |
899 | ||
78ffb476 YW |
900 | if (devnum) |
901 | *devnum = device->devnum; | |
57fa1d09 TG |
902 | |
903 | return 0; | |
904 | } | |
905 | ||
906 | int device_set_driver(sd_device *device, const char *_driver) { | |
907 | _cleanup_free_ char *driver = NULL; | |
908 | int r; | |
909 | ||
910 | assert(device); | |
911 | assert(_driver); | |
912 | ||
913 | driver = strdup(_driver); | |
914 | if (!driver) | |
915 | return -ENOMEM; | |
916 | ||
917 | r = device_add_property_internal(device, "DRIVER", driver); | |
918 | if (r < 0) | |
919 | return r; | |
920 | ||
f9ecfd3b | 921 | free_and_replace(device->driver, driver); |
57fa1d09 TG |
922 | |
923 | device->driver_set = true; | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
929 | assert_return(device, -EINVAL); | |
930 | assert_return(ret, -EINVAL); | |
931 | ||
932 | if (!device->driver_set) { | |
933 | _cleanup_free_ char *driver = NULL; | |
934 | const char *syspath; | |
935 | char *path; | |
936 | int r; | |
937 | ||
938 | r = sd_device_get_syspath(device, &syspath); | |
939 | if (r < 0) | |
940 | return r; | |
941 | ||
942 | path = strjoina(syspath, "/driver"); | |
943 | r = readlink_value(path, &driver); | |
944 | if (r >= 0) { | |
945 | r = device_set_driver(device, driver); | |
946 | if (r < 0) | |
c7d54dae | 947 | return log_device_debug_errno(device, r, "sd-device: Failed to set driver for %s: %m", device->devpath); |
7283a80d TG |
948 | } else if (r == -ENOENT) |
949 | device->driver_set = true; | |
950 | else | |
c7d54dae | 951 | return log_device_debug_errno(device, r, "sd-device: Failed to set driver for %s: %m", device->devpath); |
57fa1d09 TG |
952 | } |
953 | ||
bf4c113e DH |
954 | if (!device->driver) |
955 | return -ENOENT; | |
956 | ||
57fa1d09 TG |
957 | *ret = device->driver; |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | _public_ int sd_device_get_devpath(sd_device *device, const char **devpath) { | |
963 | assert_return(device, -EINVAL); | |
964 | assert_return(devpath, -EINVAL); | |
965 | ||
966 | assert(device->devpath); | |
967 | assert(device->devpath[0] == '/'); | |
968 | ||
969 | *devpath = device->devpath; | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
974 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
975 | int r; | |
976 | ||
977 | assert_return(device, -EINVAL); | |
978 | assert_return(devname, -EINVAL); | |
979 | ||
980 | r = device_read_uevent_file(device); | |
981 | if (r < 0) | |
982 | return r; | |
983 | ||
984 | if (!device->devname) | |
985 | return -ENOENT; | |
986 | ||
987 | assert(path_startswith(device->devname, "/dev/")); | |
988 | ||
989 | *devname = device->devname; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | static int device_set_sysname(sd_device *device) { | |
995 | _cleanup_free_ char *sysname = NULL; | |
afcac065 | 996 | const char *sysnum = NULL; |
57fa1d09 TG |
997 | const char *pos; |
998 | size_t len = 0; | |
999 | ||
1000 | pos = strrchr(device->devpath, '/'); | |
1001 | if (!pos) | |
1002 | return -EINVAL; | |
313cefa1 | 1003 | pos++; |
57fa1d09 TG |
1004 | |
1005 | /* devpath is not a root directory */ | |
1006 | if (*pos == '\0' || pos <= device->devpath) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | sysname = strdup(pos); | |
1010 | if (!sysname) | |
1011 | return -ENOMEM; | |
1012 | ||
1013 | /* some devices have '!' in their name, change that to '/' */ | |
1014 | while (sysname[len] != '\0') { | |
1015 | if (sysname[len] == '!') | |
1016 | sysname[len] = '/'; | |
1017 | ||
313cefa1 | 1018 | len++; |
57fa1d09 TG |
1019 | } |
1020 | ||
1021 | /* trailing number */ | |
1022 | while (len > 0 && isdigit(sysname[--len])) | |
1023 | sysnum = &sysname[len]; | |
1024 | ||
1025 | if (len == 0) | |
1026 | sysnum = NULL; | |
1027 | ||
f9ecfd3b | 1028 | free_and_replace(device->sysname, sysname); |
57fa1d09 TG |
1029 | |
1030 | device->sysnum = sysnum; | |
1031 | ||
1032 | device->sysname_set = true; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1038 | int r; | |
1039 | ||
1040 | assert_return(device, -EINVAL); | |
1041 | assert_return(ret, -EINVAL); | |
1042 | ||
1043 | if (!device->sysname_set) { | |
1044 | r = device_set_sysname(device); | |
1045 | if (r < 0) | |
1046 | return r; | |
1047 | } | |
1048 | ||
bf4c113e DH |
1049 | assert_return(device->sysname, -ENOENT); |
1050 | ||
57fa1d09 TG |
1051 | *ret = device->sysname; |
1052 | ||
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1057 | int r; | |
1058 | ||
1059 | assert_return(device, -EINVAL); | |
1060 | assert_return(ret, -EINVAL); | |
1061 | ||
1062 | if (!device->sysname_set) { | |
1063 | r = device_set_sysname(device); | |
1064 | if (r < 0) | |
1065 | return r; | |
1066 | } | |
1067 | ||
dcfbde3a YW |
1068 | if (!device->sysnum) |
1069 | return -ENOENT; | |
1070 | ||
57fa1d09 TG |
1071 | *ret = device->sysnum; |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static bool is_valid_tag(const char *tag) { | |
1077 | assert(tag); | |
1078 | ||
1079 | return !strchr(tag, ':') && !strchr(tag, ' '); | |
1080 | } | |
1081 | ||
1082 | int device_add_tag(sd_device *device, const char *tag) { | |
1083 | int r; | |
1084 | ||
1085 | assert(device); | |
1086 | assert(tag); | |
1087 | ||
1088 | if (!is_valid_tag(tag)) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | r = set_ensure_allocated(&device->tags, &string_hash_ops); | |
1092 | if (r < 0) | |
1093 | return r; | |
1094 | ||
1095 | r = set_put_strdup(device->tags, tag); | |
1096 | if (r < 0) | |
1097 | return r; | |
1098 | ||
313cefa1 | 1099 | device->tags_generation++; |
57fa1d09 TG |
1100 | device->property_tags_outdated = true; |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | int device_add_devlink(sd_device *device, const char *devlink) { | |
1106 | int r; | |
1107 | ||
1108 | assert(device); | |
1109 | assert(devlink); | |
1110 | ||
1111 | r = set_ensure_allocated(&device->devlinks, &string_hash_ops); | |
1112 | if (r < 0) | |
1113 | return r; | |
1114 | ||
1115 | r = set_put_strdup(device->devlinks, devlink); | |
1116 | if (r < 0) | |
1117 | return r; | |
1118 | ||
313cefa1 | 1119 | device->devlinks_generation++; |
57fa1d09 TG |
1120 | device->property_devlinks_outdated = true; |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { | |
1126 | _cleanup_free_ char *key = NULL; | |
1127 | char *value; | |
1128 | ||
1129 | assert(device); | |
1130 | assert(str); | |
1131 | ||
1132 | key = strdup(str); | |
1133 | if (!key) | |
1134 | return -ENOMEM; | |
1135 | ||
1136 | value = strchr(key, '='); | |
1137 | if (!value) | |
1138 | return -EINVAL; | |
1139 | ||
1140 | *value = '\0'; | |
1141 | ||
1142 | if (isempty(++value)) | |
1143 | value = NULL; | |
1144 | ||
1145 | return device_add_property_internal(device, key, value); | |
1146 | } | |
1147 | ||
1148 | int device_set_usec_initialized(sd_device *device, const char *initialized) { | |
1149 | uint64_t usec_initialized; | |
1150 | int r; | |
1151 | ||
1152 | assert(device); | |
1153 | assert(initialized); | |
1154 | ||
1155 | r = safe_atou64(initialized, &usec_initialized); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | r = device_add_property_internal(device, "USEC_INITIALIZED", initialized); | |
1160 | if (r < 0) | |
1161 | return r; | |
1162 | ||
1163 | device->usec_initialized = usec_initialized; | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
1169 | char *path; | |
1170 | int r; | |
1171 | ||
1172 | assert(device); | |
1173 | assert(value); | |
1174 | ||
1175 | switch (key) { | |
1176 | case 'G': | |
1177 | r = device_add_tag(device, value); | |
1178 | if (r < 0) | |
1179 | return r; | |
1180 | ||
1181 | break; | |
1182 | case 'S': | |
1183 | path = strjoina("/dev/", value); | |
1184 | r = device_add_devlink(device, path); | |
1185 | if (r < 0) | |
1186 | return r; | |
1187 | ||
1188 | break; | |
1189 | case 'E': | |
1190 | r = device_add_property_internal_from_string(device, value); | |
1191 | if (r < 0) | |
1192 | return r; | |
1193 | ||
1194 | break; | |
1195 | case 'I': | |
1196 | r = device_set_usec_initialized(device, value); | |
1197 | if (r < 0) | |
1198 | return r; | |
1199 | ||
1200 | break; | |
1201 | case 'L': | |
1202 | r = safe_atoi(value, &device->devlink_priority); | |
1203 | if (r < 0) | |
1204 | return r; | |
1205 | ||
1206 | break; | |
1207 | case 'W': | |
1208 | r = safe_atoi(value, &device->watch_handle); | |
1209 | if (r < 0) | |
1210 | return r; | |
1211 | ||
1212 | break; | |
1213 | default: | |
c7d54dae | 1214 | log_device_debug(device, "sd-device: Unknown key '%c' in device db, ignoring", key); |
57fa1d09 TG |
1215 | } |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | int device_get_id_filename(sd_device *device, const char **ret) { | |
1221 | assert(device); | |
1222 | assert(ret); | |
1223 | ||
1224 | if (!device->id_filename) { | |
1225 | _cleanup_free_ char *id = NULL; | |
1226 | const char *subsystem; | |
1227 | dev_t devnum; | |
1228 | int ifindex, r; | |
1229 | ||
1230 | r = sd_device_get_subsystem(device, &subsystem); | |
1231 | if (r < 0) | |
1232 | return r; | |
1233 | ||
dcfbde3a | 1234 | if (sd_device_get_devnum(device, &devnum) >= 0) { |
4189708a TG |
1235 | assert(subsystem); |
1236 | ||
ccddd104 | 1237 | /* use dev_t — b259:131072, c254:0 */ |
57fa1d09 TG |
1238 | r = asprintf(&id, "%c%u:%u", |
1239 | streq(subsystem, "block") ? 'b' : 'c', | |
1240 | major(devnum), minor(devnum)); | |
1241 | if (r < 0) | |
53fae771 | 1242 | return -ENOMEM; |
1dfa9607 | 1243 | } else if (sd_device_get_ifindex(device, &ifindex) >= 0) { |
ccddd104 | 1244 | /* use netdev ifindex — n3 */ |
1dfa9607 | 1245 | r = asprintf(&id, "n%u", (unsigned) ifindex); |
57fa1d09 | 1246 | if (r < 0) |
53fae771 | 1247 | return -ENOMEM; |
57fa1d09 | 1248 | } else { |
ccddd104 | 1249 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
57fa1d09 TG |
1250 | * sysname() has '!' translated, get it from devpath |
1251 | */ | |
1252 | const char *sysname; | |
1253 | ||
1254 | sysname = basename(device->devpath); | |
1255 | if (!sysname) | |
4189708a TG |
1256 | return -EINVAL; |
1257 | ||
1258 | if (!subsystem) | |
57fa1d09 TG |
1259 | return -EINVAL; |
1260 | ||
de7e983e TG |
1261 | if (streq(subsystem, "drivers")) { |
1262 | /* the 'drivers' pseudo-subsystem is special, and needs the real subsystem | |
1263 | * encoded as well */ | |
1264 | r = asprintf(&id, "+drivers:%s:%s", device->driver_subsystem, sysname); | |
1265 | if (r < 0) | |
1266 | return -ENOMEM; | |
1267 | } else { | |
1268 | r = asprintf(&id, "+%s:%s", subsystem, sysname); | |
1269 | if (r < 0) | |
1270 | return -ENOMEM; | |
1271 | } | |
57fa1d09 TG |
1272 | } |
1273 | ||
ae2a15bc | 1274 | device->id_filename = TAKE_PTR(id); |
57fa1d09 TG |
1275 | } |
1276 | ||
1277 | *ret = device->id_filename; | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
107f2e25 | 1282 | int device_read_db_aux(sd_device *device, bool force) { |
57fa1d09 TG |
1283 | _cleanup_free_ char *db = NULL; |
1284 | char *path; | |
1285 | const char *id, *value; | |
1286 | char key; | |
1287 | size_t db_len; | |
1288 | unsigned i; | |
1289 | int r; | |
1290 | ||
1291 | enum { | |
1292 | PRE_KEY, | |
1293 | KEY, | |
1294 | PRE_VALUE, | |
1295 | VALUE, | |
1296 | INVALID_LINE, | |
1297 | } state = PRE_KEY; | |
1298 | ||
107f2e25 | 1299 | if (device->db_loaded || (!force && device->sealed)) |
57fa1d09 TG |
1300 | return 0; |
1301 | ||
7141e4f6 TG |
1302 | device->db_loaded = true; |
1303 | ||
57fa1d09 TG |
1304 | r = device_get_id_filename(device, &id); |
1305 | if (r < 0) | |
1306 | return r; | |
1307 | ||
1308 | path = strjoina("/run/udev/data/", id); | |
1309 | ||
1310 | r = read_full_file(path, &db, &db_len); | |
1311 | if (r < 0) { | |
1312 | if (r == -ENOENT) | |
1313 | return 0; | |
e53fc357 | 1314 | else |
c7d54dae | 1315 | return log_device_debug_errno(device, r, "sd-device: Failed to read db '%s': %m", path); |
57fa1d09 TG |
1316 | } |
1317 | ||
1318 | /* devices with a database entry are initialized */ | |
7e518afa | 1319 | device->is_initialized = true; |
57fa1d09 TG |
1320 | |
1321 | for (i = 0; i < db_len; i++) { | |
1322 | switch (state) { | |
1323 | case PRE_KEY: | |
1324 | if (!strchr(NEWLINE, db[i])) { | |
1325 | key = db[i]; | |
1326 | ||
1327 | state = KEY; | |
1328 | } | |
1329 | ||
1330 | break; | |
1331 | case KEY: | |
1332 | if (db[i] != ':') { | |
c7d54dae | 1333 | log_device_debug(device, "sd-device: Invalid db entry with key '%c', ignoring", key); |
57fa1d09 TG |
1334 | |
1335 | state = INVALID_LINE; | |
1336 | } else { | |
1337 | db[i] = '\0'; | |
1338 | ||
1339 | state = PRE_VALUE; | |
1340 | } | |
1341 | ||
1342 | break; | |
1343 | case PRE_VALUE: | |
1344 | value = &db[i]; | |
1345 | ||
1346 | state = VALUE; | |
1347 | ||
1348 | break; | |
1349 | case INVALID_LINE: | |
1350 | if (strchr(NEWLINE, db[i])) | |
1351 | state = PRE_KEY; | |
1352 | ||
1353 | break; | |
1354 | case VALUE: | |
1355 | if (strchr(NEWLINE, db[i])) { | |
1356 | db[i] = '\0'; | |
1357 | r = handle_db_line(device, key, value); | |
1358 | if (r < 0) | |
c7d54dae | 1359 | log_device_debug_errno(device, r, "sd-device: Failed to handle db entry '%c:%s', ignoring: %m", key, value); |
57fa1d09 TG |
1360 | |
1361 | state = PRE_KEY; | |
1362 | } | |
1363 | ||
1364 | break; | |
1365 | default: | |
c7d54dae | 1366 | assert_not_reached("Invalid state when parsing db"); |
57fa1d09 TG |
1367 | } |
1368 | } | |
1369 | ||
57fa1d09 TG |
1370 | return 0; |
1371 | } | |
1372 | ||
107f2e25 TG |
1373 | static int device_read_db(sd_device *device) { |
1374 | return device_read_db_aux(device, false); | |
1375 | } | |
1376 | ||
5a937ea2 | 1377 | _public_ int sd_device_get_is_initialized(sd_device *device) { |
57fa1d09 TG |
1378 | int r; |
1379 | ||
1380 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
1381 | |
1382 | r = device_read_db(device); | |
1383 | if (r < 0) | |
1384 | return r; | |
1385 | ||
5a937ea2 | 1386 | return device->is_initialized; |
57fa1d09 TG |
1387 | } |
1388 | ||
1389 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) { | |
1390 | usec_t now_ts; | |
1391 | int r; | |
1392 | ||
1393 | assert_return(device, -EINVAL); | |
1394 | assert_return(usec, -EINVAL); | |
1395 | ||
1396 | r = device_read_db(device); | |
1397 | if (r < 0) | |
1398 | return r; | |
1399 | ||
1400 | if (!device->is_initialized) | |
1401 | return -EBUSY; | |
1402 | ||
1403 | if (!device->usec_initialized) | |
1404 | return -ENODATA; | |
1405 | ||
1406 | now_ts = now(clock_boottime_or_monotonic()); | |
1407 | ||
1408 | if (now_ts < device->usec_initialized) | |
1409 | return -EIO; | |
1410 | ||
1411 | *usec = now_ts - device->usec_initialized; | |
1412 | ||
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1417 | void *v; |
1418 | ||
57fa1d09 TG |
1419 | assert_return(device, NULL); |
1420 | ||
1421 | (void) device_read_db(device); | |
1422 | ||
1423 | device->tags_iterator_generation = device->tags_generation; | |
1424 | device->tags_iterator = ITERATOR_FIRST; | |
1425 | ||
bccfe92e | 1426 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1427 | return v; |
57fa1d09 TG |
1428 | } |
1429 | ||
1430 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1431 | void *v; |
1432 | ||
57fa1d09 TG |
1433 | assert_return(device, NULL); |
1434 | ||
1435 | (void) device_read_db(device); | |
1436 | ||
1437 | if (device->tags_iterator_generation != device->tags_generation) | |
1438 | return NULL; | |
1439 | ||
bccfe92e | 1440 | (void) set_iterate(device->tags, &device->tags_iterator, &v); |
8927b1da | 1441 | return v; |
57fa1d09 TG |
1442 | } |
1443 | ||
1444 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1445 | void *v; |
1446 | ||
57fa1d09 TG |
1447 | assert_return(device, NULL); |
1448 | ||
1449 | (void) device_read_db(device); | |
1450 | ||
1451 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1452 | device->devlinks_iterator = ITERATOR_FIRST; | |
1453 | ||
bccfe92e | 1454 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1455 | return v; |
57fa1d09 TG |
1456 | } |
1457 | ||
1458 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1459 | void *v; |
1460 | ||
57fa1d09 TG |
1461 | assert_return(device, NULL); |
1462 | ||
1463 | (void) device_read_db(device); | |
1464 | ||
1465 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1466 | return NULL; | |
1467 | ||
bccfe92e | 1468 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1469 | return v; |
57fa1d09 TG |
1470 | } |
1471 | ||
1472 | static int device_properties_prepare(sd_device *device) { | |
1473 | int r; | |
1474 | ||
1475 | assert(device); | |
1476 | ||
1477 | r = device_read_uevent_file(device); | |
1478 | if (r < 0) | |
1479 | return r; | |
1480 | ||
1481 | r = device_read_db(device); | |
1482 | if (r < 0) | |
1483 | return r; | |
1484 | ||
1485 | if (device->property_devlinks_outdated) { | |
1d88a271 MP |
1486 | _cleanup_free_ char *devlinks = NULL; |
1487 | size_t devlinks_allocated = 0, devlinks_len = 0; | |
57fa1d09 TG |
1488 | const char *devlink; |
1489 | ||
1d88a271 MP |
1490 | for (devlink = sd_device_get_devlink_first(device); devlink; devlink = sd_device_get_devlink_next(device)) { |
1491 | char *e; | |
57fa1d09 | 1492 | |
1d88a271 MP |
1493 | if (!GREEDY_REALLOC(devlinks, devlinks_allocated, devlinks_len + strlen(devlink) + 2)) |
1494 | return -ENOMEM; | |
1495 | if (devlinks_len > 0) | |
1496 | stpcpy(devlinks + devlinks_len++, " "); | |
1497 | e = stpcpy(devlinks + devlinks_len, devlink); | |
1498 | devlinks_len = e - devlinks; | |
1499 | } | |
57fa1d09 TG |
1500 | |
1501 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1502 | if (r < 0) | |
1503 | return r; | |
1504 | ||
1505 | device->property_devlinks_outdated = false; | |
1506 | } | |
1507 | ||
1508 | if (device->property_tags_outdated) { | |
1d88a271 MP |
1509 | _cleanup_free_ char *tags = NULL; |
1510 | size_t tags_allocated = 0, tags_len = 0; | |
57fa1d09 TG |
1511 | const char *tag; |
1512 | ||
1d88a271 MP |
1513 | if (!GREEDY_REALLOC(tags, tags_allocated, 2)) |
1514 | return -ENOMEM; | |
1515 | stpcpy(tags, ":"); | |
1516 | tags_len++; | |
57fa1d09 | 1517 | |
1d88a271 MP |
1518 | for (tag = sd_device_get_tag_first(device); tag; tag = sd_device_get_tag_next(device)) { |
1519 | char *e; | |
57fa1d09 | 1520 | |
817ec8cc | 1521 | if (!GREEDY_REALLOC(tags, tags_allocated, tags_len + strlen(tag) + 2)) |
1d88a271 MP |
1522 | return -ENOMEM; |
1523 | e = stpcpy(stpcpy(tags + tags_len, tag), ":"); | |
1524 | tags_len = e - tags; | |
1525 | } | |
57fa1d09 TG |
1526 | |
1527 | r = device_add_property_internal(device, "TAGS", tags); | |
1528 | if (r < 0) | |
1529 | return r; | |
1530 | ||
1531 | device->property_tags_outdated = false; | |
1532 | } | |
1533 | ||
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
1538 | const char *key; | |
1539 | const char *value; | |
1540 | int r; | |
1541 | ||
1542 | assert_return(device, NULL); | |
1543 | ||
1544 | r = device_properties_prepare(device); | |
1545 | if (r < 0) | |
1546 | return NULL; | |
1547 | ||
1548 | device->properties_iterator_generation = device->properties_generation; | |
1549 | device->properties_iterator = ITERATOR_FIRST; | |
1550 | ||
8927b1da | 1551 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1552 | |
1553 | if (_value) | |
1554 | *_value = value; | |
1555 | ||
1556 | return key; | |
1557 | } | |
1558 | ||
1559 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
1560 | const char *key; | |
1561 | const char *value; | |
1562 | int r; | |
1563 | ||
1564 | assert_return(device, NULL); | |
1565 | ||
1566 | r = device_properties_prepare(device); | |
1567 | if (r < 0) | |
1568 | return NULL; | |
1569 | ||
1570 | if (device->properties_iterator_generation != device->properties_generation) | |
1571 | return NULL; | |
1572 | ||
8927b1da | 1573 | ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)&value, (const void**)&key); |
57fa1d09 TG |
1574 | |
1575 | if (_value) | |
1576 | *_value = value; | |
1577 | ||
1578 | return key; | |
1579 | } | |
1580 | ||
1581 | static int device_sysattrs_read_all(sd_device *device) { | |
1582 | _cleanup_closedir_ DIR *dir = NULL; | |
1583 | const char *syspath; | |
1584 | struct dirent *dent; | |
1585 | int r; | |
1586 | ||
1587 | assert(device); | |
1588 | ||
1589 | if (device->sysattrs_read) | |
1590 | return 0; | |
1591 | ||
1592 | r = sd_device_get_syspath(device, &syspath); | |
1593 | if (r < 0) | |
1594 | return r; | |
1595 | ||
1596 | dir = opendir(syspath); | |
1597 | if (!dir) | |
1598 | return -errno; | |
1599 | ||
1600 | r = set_ensure_allocated(&device->sysattrs, &string_hash_ops); | |
1601 | if (r < 0) | |
1602 | return r; | |
1603 | ||
8fb3f009 | 1604 | FOREACH_DIRENT_ALL(dent, dir, return -errno) { |
57fa1d09 TG |
1605 | char *path; |
1606 | struct stat statbuf; | |
1607 | ||
1608 | /* only handle symlinks and regular files */ | |
945c2931 | 1609 | if (!IN_SET(dent->d_type, DT_LNK, DT_REG)) |
57fa1d09 TG |
1610 | continue; |
1611 | ||
1612 | path = strjoina(syspath, "/", dent->d_name); | |
1613 | ||
1614 | if (lstat(path, &statbuf) != 0) | |
1615 | continue; | |
1616 | ||
1617 | if (!(statbuf.st_mode & S_IRUSR)) | |
1618 | continue; | |
1619 | ||
1620 | r = set_put_strdup(device->sysattrs, dent->d_name); | |
1621 | if (r < 0) | |
1622 | return r; | |
1623 | } | |
1624 | ||
1625 | device->sysattrs_read = true; | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 1631 | void *v; |
57fa1d09 TG |
1632 | int r; |
1633 | ||
1634 | assert_return(device, NULL); | |
1635 | ||
1636 | if (!device->sysattrs_read) { | |
1637 | r = device_sysattrs_read_all(device); | |
1638 | if (r < 0) { | |
1639 | errno = -r; | |
1640 | return NULL; | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | device->sysattrs_iterator = ITERATOR_FIRST; | |
1645 | ||
bccfe92e | 1646 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1647 | return v; |
57fa1d09 TG |
1648 | } |
1649 | ||
1650 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
1651 | void *v; |
1652 | ||
57fa1d09 TG |
1653 | assert_return(device, NULL); |
1654 | ||
1655 | if (!device->sysattrs_read) | |
1656 | return NULL; | |
1657 | ||
bccfe92e | 1658 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 1659 | return v; |
57fa1d09 TG |
1660 | } |
1661 | ||
1662 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
1663 | assert_return(device, -EINVAL); | |
1664 | assert_return(tag, -EINVAL); | |
1665 | ||
1666 | (void) device_read_db(device); | |
1667 | ||
1668 | return !!set_contains(device->tags, tag); | |
1669 | } | |
1670 | ||
1671 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) { | |
1672 | char *value; | |
1673 | int r; | |
1674 | ||
1675 | assert_return(device, -EINVAL); | |
1676 | assert_return(key, -EINVAL); | |
57fa1d09 TG |
1677 | |
1678 | r = device_properties_prepare(device); | |
1679 | if (r < 0) | |
1680 | return r; | |
1681 | ||
1682 | value = ordered_hashmap_get(device->properties, key); | |
1683 | if (!value) | |
1684 | return -ENOENT; | |
1685 | ||
78ffb476 YW |
1686 | if (_value) |
1687 | *_value = value; | |
57fa1d09 TG |
1688 | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | /* replaces the value if it already exists */ | |
2fe29a46 | 1693 | static int device_add_sysattr_value(sd_device *device, const char *_key, char *value) { |
57fa1d09 | 1694 | _cleanup_free_ char *key = NULL; |
2fe29a46 | 1695 | _cleanup_free_ char *value_old = NULL; |
57fa1d09 TG |
1696 | int r; |
1697 | ||
1698 | assert(device); | |
1699 | assert(_key); | |
1700 | ||
1701 | r = hashmap_ensure_allocated(&device->sysattr_values, &string_hash_ops); | |
1702 | if (r < 0) | |
1703 | return r; | |
1704 | ||
2fe29a46 | 1705 | value_old = hashmap_remove2(device->sysattr_values, _key, (void **)&key); |
57fa1d09 TG |
1706 | if (!key) { |
1707 | key = strdup(_key); | |
1708 | if (!key) | |
1709 | return -ENOMEM; | |
1710 | } | |
1711 | ||
57fa1d09 TG |
1712 | r = hashmap_put(device->sysattr_values, key, value); |
1713 | if (r < 0) | |
1714 | return r; | |
1715 | ||
1716 | key = NULL; | |
57fa1d09 TG |
1717 | |
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | static int device_get_sysattr_value(sd_device *device, const char *_key, const char **_value) { | |
1722 | const char *key = NULL, *value; | |
1723 | ||
1724 | assert(device); | |
1725 | assert(_key); | |
1726 | ||
1727 | value = hashmap_get2(device->sysattr_values, _key, (void **) &key); | |
1728 | if (!key) | |
1729 | return -ENOENT; | |
1730 | ||
1731 | if (_value) | |
1732 | *_value = value; | |
1733 | ||
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
1738 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
1739 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **_value) { | |
1740 | _cleanup_free_ char *value = NULL; | |
1741 | const char *syspath, *cached_value = NULL; | |
1742 | char *path; | |
1743 | struct stat statbuf; | |
1744 | int r; | |
1745 | ||
1746 | assert_return(device, -EINVAL); | |
1747 | assert_return(sysattr, -EINVAL); | |
1748 | ||
1749 | /* look for possibly already cached result */ | |
1750 | r = device_get_sysattr_value(device, sysattr, &cached_value); | |
1751 | if (r != -ENOENT) { | |
1752 | if (r < 0) | |
1753 | return r; | |
1754 | ||
1755 | if (!cached_value) | |
1756 | /* we looked up the sysattr before and it did not exist */ | |
1757 | return -ENOENT; | |
1758 | ||
1759 | if (_value) | |
1760 | *_value = cached_value; | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
1765 | r = sd_device_get_syspath(device, &syspath); | |
1766 | if (r < 0) | |
1767 | return r; | |
1768 | ||
1769 | path = strjoina(syspath, "/", sysattr); | |
1770 | r = lstat(path, &statbuf); | |
1771 | if (r < 0) { | |
1772 | /* remember that we could not access the sysattr */ | |
1773 | r = device_add_sysattr_value(device, sysattr, NULL); | |
1774 | if (r < 0) | |
1775 | return r; | |
1776 | ||
1777 | return -ENOENT; | |
1778 | } else if (S_ISLNK(statbuf.st_mode)) { | |
1779 | /* Some core links return only the last element of the target path, | |
1780 | * these are just values, the paths should not be exposed. */ | |
1781 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
1782 | r = readlink_value(path, &value); | |
1783 | if (r < 0) | |
1784 | return r; | |
1785 | } else | |
1786 | return -EINVAL; | |
1787 | } else if (S_ISDIR(statbuf.st_mode)) { | |
1788 | /* skip directories */ | |
1789 | return -EINVAL; | |
1790 | } else if (!(statbuf.st_mode & S_IRUSR)) { | |
1791 | /* skip non-readable files */ | |
1792 | return -EPERM; | |
1793 | } else { | |
1794 | size_t size; | |
1795 | ||
1796 | /* read attribute value */ | |
1797 | r = read_full_file(path, &value, &size); | |
1798 | if (r < 0) | |
1799 | return r; | |
1800 | ||
1801 | /* drop trailing newlines */ | |
1802 | while (size > 0 && value[--size] == '\n') | |
1803 | value[size] = '\0'; | |
1804 | } | |
1805 | ||
1806 | r = device_add_sysattr_value(device, sysattr, value); | |
1807 | if (r < 0) | |
1808 | return r; | |
1809 | ||
1cc6c93a | 1810 | *_value = TAKE_PTR(value); |
57fa1d09 TG |
1811 | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | static void device_remove_sysattr_value(sd_device *device, const char *_key) { | |
1816 | _cleanup_free_ char *key = NULL; | |
1817 | _cleanup_free_ char *value = NULL; | |
1818 | ||
1819 | assert(device); | |
1820 | assert(_key); | |
1821 | ||
1822 | value = hashmap_remove2(device->sysattr_values, _key, (void **) &key); | |
1823 | ||
1824 | return; | |
1825 | } | |
1826 | ||
1827 | /* set the attribute and save it in the cache. If a NULL value is passed the | |
1828 | * attribute is cleared from the cache */ | |
8aae9a66 | 1829 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, const char *_value) { |
57fa1d09 | 1830 | _cleanup_close_ int fd = -1; |
2fe29a46 | 1831 | _cleanup_free_ char *value = NULL; |
57fa1d09 TG |
1832 | const char *syspath; |
1833 | char *path; | |
2fa4861a | 1834 | size_t len = 0; |
57fa1d09 TG |
1835 | ssize_t size; |
1836 | int r; | |
1837 | ||
1838 | assert_return(device, -EINVAL); | |
1839 | assert_return(sysattr, -EINVAL); | |
1840 | ||
2fe29a46 | 1841 | if (!_value) { |
57fa1d09 TG |
1842 | device_remove_sysattr_value(device, sysattr); |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | r = sd_device_get_syspath(device, &syspath); | |
1848 | if (r < 0) | |
1849 | return r; | |
1850 | ||
1851 | path = strjoina(syspath, "/", sysattr); | |
2fa4861a ZJS |
1852 | |
1853 | fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); | |
1854 | if (fd < 0) { | |
1855 | if (errno == ELOOP) | |
1856 | return -EINVAL; | |
1857 | if (errno == EISDIR) | |
1858 | return -EISDIR; | |
1859 | ||
2fe29a46 TG |
1860 | value = strdup(""); |
1861 | if (!value) | |
1862 | return -ENOMEM; | |
1863 | ||
1864 | r = device_add_sysattr_value(device, sysattr, value); | |
57fa1d09 TG |
1865 | if (r < 0) |
1866 | return r; | |
3bd82598 | 1867 | value = NULL; |
57fa1d09 TG |
1868 | |
1869 | return -ENXIO; | |
1870 | } | |
1871 | ||
2fa4861a | 1872 | len = strlen(_value); |
57fa1d09 TG |
1873 | |
1874 | /* drop trailing newlines */ | |
2fa4861a ZJS |
1875 | while (len > 0 && _value[len - 1] == '\n') |
1876 | len --; | |
57fa1d09 TG |
1877 | |
1878 | /* value length is limited to 4k */ | |
2fa4861a | 1879 | if (len > 4096) |
57fa1d09 TG |
1880 | return -EINVAL; |
1881 | ||
2fa4861a | 1882 | value = strndup(_value, len); |
2fe29a46 TG |
1883 | if (!value) |
1884 | return -ENOMEM; | |
1885 | ||
2fa4861a | 1886 | size = write(fd, value, len); |
57fa1d09 TG |
1887 | if (size < 0) |
1888 | return -errno; | |
1889 | ||
2fa4861a | 1890 | if ((size_t)size != len) |
57fa1d09 TG |
1891 | return -EIO; |
1892 | ||
1893 | r = device_add_sysattr_value(device, sysattr, value); | |
1894 | if (r < 0) | |
1895 | return r; | |
2fe29a46 TG |
1896 | value = NULL; |
1897 | ||
57fa1d09 TG |
1898 | return 0; |
1899 | } |