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
);