4 * Directory utility functions for libsysfs
6 * Copyright (C) IBM Corp. 2003
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 * sysfs_del_attribute: routine for dlist integration
29 static void sysfs_del_attribute(void *attr)
31 sysfs_close_attribute((struct sysfs_attribute *)attr);
35 * sysfs_del_link: routine for dlist integration
37 static void sysfs_del_link(void *ln)
39 sysfs_close_link((struct sysfs_link *)ln);
43 * sysfs_del_dir: routine for dlist integration
45 static void sysfs_del_directory(void *dir)
47 sysfs_close_directory((struct sysfs_directory *)dir);
51 * dir_attribute_name_equal: compares dir attributes by name
52 * @a: attribute name for comparison
53 * @b: sysfs_attribute to be compared.
54 * returns 1 if a==b->name or 0 if not equal
56 static int dir_attribute_name_equal(void *a, void *b)
58 if (a == NULL || b == NULL)
61 if (strcmp(((unsigned char *)a), ((struct sysfs_attribute *)b)->name)
68 * dir_link_name_equal: compares dir links by name
69 * @a: link name for comparison
70 * @b: sysfs_link to be compared.
71 * returns 1 if a==b->name or 0 if not equal
73 static int dir_link_name_equal(void *a, void *b)
75 if (a == NULL || b == NULL)
78 if (strcmp(((unsigned char *)a), ((struct sysfs_link *)b)->name)
85 * dir_subdir_name_equal: compares subdirs by name
86 * @a: name of subdirectory to compare
87 * @b: sysfs_directory subdirectory to be compared
88 * returns 1 if a==b->name or 0 if not equal
90 static int dir_subdir_name_equal(void *a, void *b)
92 if (a == NULL || b == NULL)
95 if (strcmp(((unsigned char *)a), ((struct sysfs_directory *)b)->name)
102 * sysfs_close_attribute: closes and cleans up attribute
103 * @sysattr: attribute to close.
105 void sysfs_close_attribute(struct sysfs_attribute *sysattr)
107 if (sysattr != NULL) {
108 if (sysattr->value != NULL)
109 free(sysattr->value);
115 * alloc_attribute: allocates and initializes attribute structure
116 * returns struct sysfs_attribute with success and NULL with error.
118 static struct sysfs_attribute *alloc_attribute(void)
120 return (struct sysfs_attribute *)
121 calloc(1, sizeof(struct sysfs_attribute));
125 * sysfs_open_attribute: creates sysfs_attribute structure
126 * @path: path to attribute.
127 * returns sysfs_attribute struct with success and NULL with error.
129 struct sysfs_attribute *sysfs_open_attribute(const unsigned char *path)
131 struct sysfs_attribute *sysattr = NULL;
132 struct stat fileinfo;
138 sysattr = alloc_attribute();
139 if (sysattr == NULL) {
140 dprintf("Error allocating attribute at %s\n", path);
143 if (sysfs_get_name_from_path(path, sysattr->name, SYSFS_NAME_LEN)
145 dprintf("Error retrieving attribute name from path: %s\n",
147 sysfs_close_attribute(sysattr);
150 strncpy(sysattr->path, path, SYSFS_PATH_MAX);
151 if ((stat(sysattr->path, &fileinfo)) != 0) {
152 dprintf("Stat failed: No such attribute?\n");
157 if (fileinfo.st_mode & S_IRUSR)
158 sysattr->method |= SYSFS_METHOD_SHOW;
159 if (fileinfo.st_mode & S_IWUSR)
160 sysattr->method |= SYSFS_METHOD_STORE;
167 * sysfs_write_attribute: write value to the attribute
168 * @sysattr: attribute to write
169 * @new_value: value to write
170 * @len: length of "new_value"
171 * returns 0 with success and -1 with error.
173 int sysfs_write_attribute(struct sysfs_attribute *sysattr,
174 const unsigned char *new_value, size_t len)
179 if (sysattr == NULL || new_value == NULL || len == 0) {
184 if (!(sysattr->method & SYSFS_METHOD_STORE)) {
185 dprintf ("Store method not supported for attribute %s\n",
189 if (sysattr->method & SYSFS_METHOD_SHOW) {
191 * read attribute again to see if we can get an updated value
193 if ((sysfs_read_attribute(sysattr)) != 0) {
194 dprintf("Error reading attribute\n");
197 if ((strncmp(sysattr->value, new_value, sysattr->len)) == 0) {
198 dprintf("Attr %s already has the requested value %s\n",
199 sysattr->name, new_value);
204 * open O_WRONLY since some attributes have no "read" but only
207 if ((fd = open(sysattr->path, O_WRONLY)) < 0) {
208 dprintf("Error reading attribute %s\n", sysattr->path);
212 length = write(fd, new_value, len);
214 dprintf("Error writing to the attribute %s - invalid value?\n",
218 } else if (length != len) {
219 dprintf("Could not write %d bytes to attribute %s\n",
222 * since we could not write user supplied number of bytes,
223 * restore the old value if one available
225 if (sysattr->method & SYSFS_METHOD_SHOW) {
226 length = write(fd, sysattr->value, sysattr->len);
233 * Validate length that has been copied. Alloc appropriate area
234 * in sysfs_attribute. Verify first if the attribute supports reading
235 * (show method). If it does not, do not bother
237 if (sysattr->method & SYSFS_METHOD_SHOW) {
238 if (length != sysattr->len) {
239 sysattr->value = (char *)realloc(sysattr->value,
241 sysattr->len = length;
242 strncpy(sysattr->value, new_value, length);
244 /*"length" of the new value is same as old one */
245 strncpy(sysattr->value, new_value, length);
255 * sysfs_read_attribute: reads value from attribute
256 * @sysattr: attribute to read
257 * returns 0 with success and -1 with error.
259 int sysfs_read_attribute(struct sysfs_attribute *sysattr)
261 unsigned char *fbuf = NULL;
262 unsigned char *vbuf = NULL;
267 if (sysattr == NULL) {
271 if (!(sysattr->method & SYSFS_METHOD_SHOW)) {
272 dprintf("Show method not supported for attribute %s\n",
277 pgsize = getpagesize();
278 fbuf = (unsigned char *)calloc(1, pgsize+1);
280 dprintf("calloc failed\n");
283 if ((fd = open(sysattr->path, O_RDONLY)) < 0) {
284 dprintf("Error reading attribute %s\n", sysattr->path);
288 length = read(fd, fbuf, pgsize);
290 dprintf("Error reading from attribute %s\n", sysattr->path);
295 if (sysattr->len > 0) {
296 if ((sysattr->len == length) &&
297 (!(strncmp(sysattr->value, fbuf, length)))) {
301 free(sysattr->value);
303 sysattr->len = length;
305 vbuf = (unsigned char *)realloc(fbuf, length+1);
307 dprintf("realloc failed\n");
311 sysattr->value = vbuf;
317 * sysfs_read_attribute_value: given path to attribute, return its value.
318 * values can be up to a pagesize, if buffer is smaller the value will
320 * @attrpath: sysfs path to attribute
321 * @value: buffer to put value
322 * @vsize: size of value buffer
323 * returns 0 with success and -1 with error.
325 int sysfs_read_attribute_value(const unsigned char *attrpath,
326 unsigned char *value, size_t vsize)
328 struct sysfs_attribute *attr = NULL;
331 if (attrpath == NULL || value == NULL) {
336 attr = sysfs_open_attribute(attrpath);
338 dprintf("Invalid attribute path %s\n", attrpath);
342 if((sysfs_read_attribute(attr)) != 0 || attr->value == NULL) {
343 dprintf("Error reading from attribute %s\n", attrpath);
344 sysfs_close_attribute(attr);
347 length = strlen(attr->value);
349 dprintf("Value length %d is larger than supplied buffer %d\n",
351 strncpy(value, attr->value, vsize);
352 sysfs_close_attribute(attr);
358 * sysfs_get_value_from_attrbutes: given a linked list of attributes and an
359 * attribute name, return its value
360 * @attr: attribute to search
361 * @name: name to look for
362 * returns unsigned char * value - could be NULL
364 unsigned char *sysfs_get_value_from_attributes(struct dlist *attr,
365 const unsigned char *name)
367 struct sysfs_attribute *cur = NULL;
369 if (attr == NULL || name == NULL) {
373 dlist_for_each_data(attr, cur, struct sysfs_attribute) {
374 if (strcmp(cur->name, name) == 0)
381 * sysfs_close_link: closes and cleans up link.
382 * @ln: link to close.
384 void sysfs_close_link(struct sysfs_link *ln)
391 * sysfs_close_directory: closes directory, cleans up attributes and links
392 * @sysdir: sysfs_directory to close
394 void sysfs_close_directory(struct sysfs_directory *sysdir)
396 if (sysdir != NULL) {
397 if (sysdir->subdirs != NULL)
398 dlist_destroy(sysdir->subdirs);
399 if (sysdir->links != NULL)
400 dlist_destroy(sysdir->links);
401 if (sysdir->attributes != NULL)
402 dlist_destroy(sysdir->attributes);
409 * alloc_directory: allocates and initializes directory structure
410 * returns struct sysfs_directory with success or NULL with error.
412 static struct sysfs_directory *alloc_directory(void)
414 return (struct sysfs_directory *)
415 calloc(1, sizeof(struct sysfs_directory));
419 * alloc_link: allocates and initializes link structure
420 * returns struct sysfs_link with success or NULL with error.
422 static struct sysfs_link *alloc_link(void)
424 return (struct sysfs_link *)calloc(1, sizeof(struct sysfs_link));
428 * sysfs_read_all_subdirs: calls sysfs_read_directory for all subdirs
429 * @sysdir: directory whose subdirs need reading.
430 * returns 0 with success and -1 with error.
432 int sysfs_read_all_subdirs(struct sysfs_directory *sysdir)
434 struct sysfs_directory *cursub = NULL;
436 if (sysdir == NULL) {
440 if (sysdir->subdirs == NULL)
441 if ((sysfs_read_dir_subdirs(sysdir)) != 0)
443 if (sysdir->subdirs != NULL) {
444 dlist_for_each_data(sysdir->subdirs, cursub,
445 struct sysfs_directory) {
446 if ((sysfs_read_dir_subdirs(cursub)) != 0)
447 dprintf ("Error reading subdirectory %s\n",
455 * sysfs_open_directory: opens a sysfs directory, creates dir struct, and
457 * @path: path of directory to open.
458 * returns: struct sysfs_directory * with success and NULL on error.
460 struct sysfs_directory *sysfs_open_directory(const unsigned char *path)
462 struct sysfs_directory *sdir = NULL;
469 if (sysfs_path_is_dir(path) != 0) {
470 dprintf("Invalid path directory %s\n", path);
475 sdir = alloc_directory();
477 dprintf("Error allocating directory %s\n", path);
480 if (sysfs_get_name_from_path(path, sdir->name, SYSFS_NAME_LEN) != 0) {
481 dprintf("Error getting directory name from path: %s\n", path);
482 sysfs_close_directory(sdir);
485 strncpy(sdir->path, path, SYSFS_PATH_MAX);
491 * sysfs_open_link: opens a sysfs link, creates struct, and returns
492 * @path: path of link to open.
493 * returns: struct sysfs_link * with success and NULL on error.
495 struct sysfs_link *sysfs_open_link(const unsigned char *linkpath)
497 struct sysfs_link *ln = NULL;
499 if (linkpath == NULL || strlen(linkpath) > SYSFS_PATH_MAX) {
506 dprintf("Error allocating link %s\n", linkpath);
509 strcpy(ln->path, linkpath);
510 if ((sysfs_get_name_from_path(linkpath, ln->name, SYSFS_NAME_LEN)) != 0
511 || (sysfs_get_link(linkpath, ln->target, SYSFS_PATH_MAX)) != 0) {
513 dprintf("Invalid link path %s\n", linkpath);
521 * add_attribute: open and add attribute at path to given directory
522 * @sysdir: directory to add attribute to
523 * @path: path to attribute
524 * returns 0 with success and -1 with error.
526 static int add_attribute(struct sysfs_directory *sysdir,
527 const unsigned char *path)
529 struct sysfs_attribute *attr = NULL;
531 attr = sysfs_open_attribute(path);
533 dprintf("Error opening attribute %s\n", path);
536 if (attr->method & SYSFS_METHOD_SHOW) {
537 if ((sysfs_read_attribute(attr)) != 0) {
538 dprintf("Error reading attribute %s\n", path);
539 sysfs_close_attribute(attr);
544 if (sysdir->attributes == NULL) {
545 sysdir->attributes = dlist_new_with_delete
546 (sizeof(struct sysfs_attribute), sysfs_del_attribute);
548 dlist_unshift(sysdir->attributes, attr);
554 * add_subdirectory: open and add subdirectory at path to given directory
555 * @sysdir: directory to add subdir to
556 * @path: path to subdirectory
557 * returns 0 with success and -1 with error.
559 static int add_subdirectory(struct sysfs_directory *sysdir,
560 const unsigned char *path)
562 struct sysfs_directory *subdir = NULL;
564 subdir = sysfs_open_directory(path);
565 if (subdir == NULL) {
566 dprintf("Error opening directory %s\n", path);
569 if (sysdir->subdirs == NULL)
570 sysdir->subdirs = dlist_new_with_delete
571 (sizeof(struct sysfs_directory), sysfs_del_directory);
572 dlist_unshift(sysdir->subdirs, subdir);
577 * add_link: open and add link at path to given directory
578 * @sysdir: directory to add link to
579 * @path: path to link
580 * returns 0 with success and -1 with error.
582 static int add_link(struct sysfs_directory *sysdir, const unsigned char *path)
584 struct sysfs_link *ln = NULL;
586 ln = sysfs_open_link(path);
588 dprintf("Error opening link %s\n", path);
591 if (sysdir->links == NULL)
592 sysdir->links = dlist_new_with_delete
593 (sizeof(struct sysfs_link), sysfs_del_link);
594 dlist_unshift(sysdir->links, ln);
599 * sysfs_read_dir_attributes: grabs attributes for the given directory
600 * @sysdir: sysfs directory to open
601 * returns 0 with success and -1 with error.
603 int sysfs_read_dir_attributes(struct sysfs_directory *sysdir)
606 struct dirent *dirent = NULL;
607 unsigned char file_path[SYSFS_PATH_MAX];
610 if (sysdir == NULL) {
614 dir = opendir(sysdir->path);
616 dprintf("Error opening directory %s\n", sysdir->path);
619 while(((dirent = readdir(dir)) != NULL) && retval == 0) {
620 if (0 == strcmp(dirent->d_name, "."))
622 if (0 == strcmp(dirent->d_name, ".."))
624 memset(file_path, 0, SYSFS_PATH_MAX);
625 strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
626 strcat(file_path, "/");
627 strcat(file_path, dirent->d_name);
628 if ((sysfs_path_is_file(file_path)) == 0)
629 retval = add_attribute(sysdir, file_path);
636 * sysfs_read_dir_links: grabs links in a specific directory
637 * @sysdir: sysfs directory to read links
638 * returns 0 with success and -1 with error.
640 int sysfs_read_dir_links(struct sysfs_directory *sysdir)
643 struct dirent *dirent = NULL;
644 unsigned char file_path[SYSFS_PATH_MAX];
647 if (sysdir == NULL) {
651 dir = opendir(sysdir->path);
653 dprintf("Error opening directory %s\n", sysdir->path);
656 while(((dirent = readdir(dir)) != NULL) && retval == 0) {
657 if (0 == strcmp(dirent->d_name, "."))
659 if (0 == strcmp(dirent->d_name, ".."))
661 memset(file_path, 0, SYSFS_PATH_MAX);
662 strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
663 strcat(file_path, "/");
664 strcat(file_path, dirent->d_name);
665 if ((sysfs_path_is_link(file_path)) == 0) {
666 retval = add_link(sysdir, file_path);
676 * sysfs_read_dir_subdirs: grabs subdirs in a specific directory
677 * @sysdir: sysfs directory to read links
678 * returns 0 with success and -1 with error.
680 int sysfs_read_dir_subdirs(struct sysfs_directory *sysdir)
683 struct dirent *dirent = NULL;
684 unsigned char file_path[SYSFS_PATH_MAX];
687 if (sysdir == NULL) {
691 dir = opendir(sysdir->path);
693 dprintf("Error opening directory %s\n", sysdir->path);
696 while(((dirent = readdir(dir)) != NULL) && retval == 0) {
697 if (0 == strcmp(dirent->d_name, "."))
699 if (0 == strcmp(dirent->d_name, ".."))
701 memset(file_path, 0, SYSFS_PATH_MAX);
702 strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
703 strcat(file_path, "/");
704 strcat(file_path, dirent->d_name);
705 if ((sysfs_path_is_dir(file_path)) == 0)
706 retval = add_subdirectory(sysdir, file_path);
713 * sysfs_read_directory: grabs attributes, links, and subdirectories
714 * @sysdir: sysfs directory to open
715 * returns 0 with success and -1 with error.
717 int sysfs_read_directory(struct sysfs_directory *sysdir)
720 struct dirent *dirent = NULL;
722 unsigned char file_path[SYSFS_PATH_MAX];
725 if (sysdir == NULL) {
729 dir = opendir(sysdir->path);
731 dprintf("Error opening directory %s\n", sysdir->path);
734 while(((dirent = readdir(dir)) != NULL) && retval == 0) {
735 if (0 == strcmp(dirent->d_name, "."))
737 if (0 == strcmp(dirent->d_name, ".."))
739 memset(file_path, 0, SYSFS_PATH_MAX);
740 strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
741 strcat(file_path, "/");
742 strcat(file_path, dirent->d_name);
743 if ((lstat(file_path, &astats)) != 0) {
744 dprintf("stat failed\n");
747 if (S_ISDIR(astats.st_mode))
748 retval = add_subdirectory(sysdir, file_path);
750 else if (S_ISLNK(astats.st_mode))
751 retval = add_link(sysdir, file_path);
753 else if (S_ISREG(astats.st_mode))
754 retval = add_attribute(sysdir, file_path);
761 * sysfs_refresh_dir_attributes: Refresh attributes list
762 * @sysdir: directory whose list of attributes to refresh
763 * Returns 0 on success, 1 on failure
765 int sysfs_refresh_dir_attributes(struct sysfs_directory *sysdir)
767 if (sysdir == NULL) {
771 if ((sysfs_path_is_dir(sysdir->path)) != 0) {
772 dprintf("Invalid path to directory %s\n", sysdir->path);
776 if (sysdir->attributes != NULL) {
777 dlist_destroy(sysdir->attributes);
778 sysdir->attributes = NULL;
780 if ((sysfs_read_dir_attributes(sysdir)) != 0) {
781 dprintf("Error refreshing attributes for directory %s\n",
789 * sysfs_refresh_dir_links: Refresh links list
790 * @sysdir: directory whose list of links to refresh
791 * Returns 0 on success, 1 on failure
793 int sysfs_refresh_dir_links(struct sysfs_directory *sysdir)
795 if (sysdir == NULL) {
799 if ((sysfs_path_is_dir(sysdir->path)) != 0) {
800 dprintf("Invalid path to directory %s\n", sysdir->path);
804 if (sysdir->links != NULL) {
805 dlist_destroy(sysdir->links);
806 sysdir->links = NULL;
808 if ((sysfs_read_dir_links(sysdir)) != 0) {
809 dprintf("Error refreshing links for directory %s\n",
817 * sysfs_refresh_dir_subdirs: Refresh subdirs list
818 * @sysdir: directory whose list of subdirs to refresh
819 * Returns 0 on success, 1 on failure
821 int sysfs_refresh_dir_subdirs(struct sysfs_directory *sysdir)
823 if (sysdir == NULL) {
827 if ((sysfs_path_is_dir(sysdir->path)) != 0) {
828 dprintf("Invalid path to directory %s\n", sysdir->path);
832 if (sysdir->subdirs != NULL) {
833 dlist_destroy(sysdir->subdirs);
834 sysdir->subdirs = NULL;
836 if ((sysfs_read_dir_subdirs(sysdir)) != 0) {
837 dprintf("Error refreshing subdirs for directory %s\n",
845 * sysfs_get_directory_attribute: retrieves attribute attrname from current
847 * @dir: directory to retrieve attribute from
848 * @attrname: name of attribute to look for
849 * returns sysfs_attribute if found and NULL if not found
851 struct sysfs_attribute *sysfs_get_directory_attribute
852 (struct sysfs_directory *dir, unsigned char *attrname)
854 struct sysfs_attribute *attr = NULL;
855 unsigned char new_path[SYSFS_PATH_MAX];
857 if (dir == NULL || attrname == NULL) {
862 if (dir->attributes == NULL)
863 if ((sysfs_read_dir_attributes(dir) != 0)
864 || (dir->attributes == NULL))
867 attr = (struct sysfs_attribute *)dlist_find_custom
868 (dir->attributes, attrname, dir_attribute_name_equal);
870 if ((sysfs_read_attribute(attr)) != 0) {
871 dprintf("Error reading attribute %s\n", attr->name);
875 memset(new_path, 0, SYSFS_PATH_MAX);
876 strcpy(new_path, dir->path);
877 strcat(new_path, "/");
878 strcat(new_path, attrname);
879 if ((sysfs_path_is_file(new_path)) == 0) {
880 if ((add_attribute(dir, new_path)) == 0) {
881 attr = (struct sysfs_attribute *)
882 dlist_find_custom(dir->attributes,
883 attrname, dir_attribute_name_equal);
892 * sysfs_get_directory_link: retrieves link from one directory list
893 * @dir: directory to retrieve link from
894 * @linkname: name of link to look for
895 * returns reference to sysfs_link if found and NULL if not found
897 struct sysfs_link *sysfs_get_directory_link
898 (struct sysfs_directory *dir, unsigned char *linkname)
900 if (dir == NULL || linkname == NULL) {
904 if (dir->links == NULL) {
905 if ((sysfs_read_dir_links(dir) != 0) || (dir->links == NULL))
908 if ((sysfs_refresh_dir_links(dir)) != 0)
912 return (struct sysfs_link *)dlist_find_custom(dir->links,
913 linkname, dir_link_name_equal);
917 * sysfs_get_subdirectory: retrieves subdirectory by name.
918 * @dir: directory to search for subdirectory.
919 * @subname: subdirectory name to get.
920 * returns reference to subdirectory or NULL if not found
922 struct sysfs_directory *sysfs_get_subdirectory(struct sysfs_directory *dir,
923 unsigned char *subname)
925 struct sysfs_directory *sub = NULL, *cursub = NULL;
927 if (dir == NULL || subname == NULL) {
932 if (dir->subdirs == NULL)
933 if (sysfs_read_dir_subdirs(dir) != 0)
936 sub = (struct sysfs_directory *)dlist_find_custom(dir->subdirs,
937 subname, dir_subdir_name_equal);
941 if (dir->subdirs != NULL) {
942 dlist_for_each_data(dir->subdirs, cursub,
943 struct sysfs_directory) {
944 if (cursub->subdirs == NULL) {
945 if (sysfs_read_dir_subdirs(cursub) != 0)
947 if (cursub->subdirs == NULL)
950 sub = sysfs_get_subdirectory(cursub, subname);
959 * sysfs_get_subdirectory_link: looks through all subdirs for specific link.
960 * @dir: directory and subdirectories to search for link.
961 * @linkname: link name to get.
962 * returns reference to link or NULL if not found
964 struct sysfs_link *sysfs_get_subdirectory_link(struct sysfs_directory *dir,
965 unsigned char *linkname)
967 struct sysfs_directory *cursub = NULL;
968 struct sysfs_link *ln = NULL;
970 if (dir == NULL || linkname == NULL) {
975 ln = sysfs_get_directory_link(dir, linkname);
979 if (dir->subdirs == NULL)
980 if (sysfs_read_dir_subdirs(dir) != 0)
983 if (dir->subdirs != NULL) {
984 dlist_for_each_data(dir->subdirs, cursub,
985 struct sysfs_directory) {
986 ln = sysfs_get_subdirectory_link(cursub, linkname);
995 * sysfs_get_dir_attributes: returns dlist of directory attributes
996 * @dir: directory to retrieve attributes from
997 * returns dlist of attributes or NULL
999 struct dlist *sysfs_get_dir_attributes(struct sysfs_directory *dir)
1006 if (dir->attributes == NULL) {
1007 if (sysfs_read_dir_attributes(dir) != 0)
1011 return (dir->attributes);
1015 * sysfs_get_dir_links: returns dlist of directory links
1016 * @dir: directory to return links for
1017 * returns dlist of links or NULL
1019 struct dlist *sysfs_get_dir_links(struct sysfs_directory *dir)
1026 if (dir->links == NULL) {
1027 if (sysfs_read_dir_links(dir) != 0)
1031 return (dir->links);
1035 * sysfs_get_dir_subdirs: returns dlist of directory subdirectories
1036 * @dir: directory to return subdirs for
1037 * returns dlist of subdirs or NULL
1039 struct dlist *sysfs_get_dir_subdirs(struct sysfs_directory *dir)
1046 if (dir->subdirs == NULL) {
1047 if (sysfs_read_dir_subdirs(dir) != 0)
1051 return (dir->subdirs);