*
* Directory utility functions for libsysfs
*
- * Copyright (C) 2003 International Business Machines, Inc.
+ * Copyright (C) IBM Corp. 2003
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include "libsysfs.h"
#include "sysfs.h"
+/**
+ * sysfs_del_attribute: routine for dlist integration
+ */
+static void sysfs_del_attribute(void *attr)
+{
+ sysfs_close_attribute((struct sysfs_attribute *)attr);
+}
+
+/**
+ * sysfs_del_link: routine for dlist integration
+ */
+static void sysfs_del_link(void *ln)
+{
+ sysfs_close_link((struct sysfs_link *)ln);
+}
+
+/**
+ * sysfs_del_dir: routine for dlist integration
+ */
+static void sysfs_del_directory(void *dir)
+{
+ sysfs_close_directory((struct sysfs_directory *)dir);
+}
+
+/**
+ * dir_attribute_name_equal: compares dir attributes by name
+ * @a: attribute name for comparison
+ * @b: sysfs_attribute to be compared.
+ * returns 1 if a==b->name or 0 if not equal
+ */
+static int dir_attribute_name_equal(void *a, void *b)
+{
+ if (a == NULL || b == NULL)
+ return 0;
+
+ if (strcmp(((unsigned char *)a), ((struct sysfs_attribute *)b)->name)
+ == 0)
+ return 1;
+ return 0;
+}
+
+/**
+ * dir_link_name_equal: compares dir links by name
+ * @a: link name for comparison
+ * @b: sysfs_link to be compared.
+ * returns 1 if a==b->name or 0 if not equal
+ */
+static int dir_link_name_equal(void *a, void *b)
+{
+ if (a == NULL || b == NULL)
+ return 0;
+
+ if (strcmp(((unsigned char *)a), ((struct sysfs_link *)b)->name)
+ == 0)
+ return 1;
+ return 0;
+}
+
+/**
+ * dir_subdir_name_equal: compares subdirs by name
+ * @a: name of subdirectory to compare
+ * @b: sysfs_directory subdirectory to be compared
+ * returns 1 if a==b->name or 0 if not equal
+ */
+static int dir_subdir_name_equal(void *a, void *b)
+{
+ if (a == NULL || b == NULL)
+ return 0;
+
+ if (strcmp(((unsigned char *)a), ((struct sysfs_directory *)b)->name)
+ == 0)
+ return 1;
+ return 0;
+}
+
/**
* sysfs_close_attribute: closes and cleans up attribute
* @sysattr: attribute to close.
* @path: path to attribute.
* returns sysfs_attribute struct with success and NULL with error.
*/
-struct sysfs_attribute *sysfs_open_attribute(const char *path)
+struct sysfs_attribute *sysfs_open_attribute(const unsigned char *path)
{
struct sysfs_attribute *sysattr = NULL;
struct stat fileinfo;
}
sysattr = alloc_attribute();
if (sysattr == NULL) {
- dprintf(stderr, "Error allocating attribute at %s\n", path);
+ dprintf("Error allocating attribute at %s\n", path);
+ return NULL;
+ }
+ if (sysfs_get_name_from_path(path, sysattr->name, SYSFS_NAME_LEN)
+ != 0) {
+ dprintf("Error retrieving attribute name from path: %s\n",
+ path);
+ sysfs_close_attribute(sysattr);
return NULL;
}
strncpy(sysattr->path, path, sizeof(sysattr->path));
if ((stat(sysattr->path, &fileinfo)) != 0) {
- perror("stat");
+ dprintf("Stat failed: No such attribute?\n");
sysattr->method = 0;
+ free(sysattr);
+ sysattr = NULL;
} else {
if (fileinfo.st_mode & S_IRUSR)
sysattr->method |= SYSFS_METHOD_SHOW;
return sysattr;
}
+/**
+ * sysfs_write_attribute: write value to the attribute
+ * @sysattr: attribute to write
+ * @new_value: value to write
+ * @len: length of "new_value"
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_write_attribute(struct sysfs_attribute *sysattr,
+ const unsigned char *new_value, size_t len)
+{
+ int fd;
+ int length;
+
+ if (sysattr == NULL || new_value == NULL || len == 0) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (!(sysattr->method & SYSFS_METHOD_STORE)) {
+ dprintf ("Store method not supported for attribute %s\n",
+ sysattr->path);
+ return -1;
+ }
+ if (sysattr->method & SYSFS_METHOD_SHOW) {
+ if ((strncmp(sysattr->value, new_value, sysattr->len)) == 0) {
+ dprintf("Attribute %s already has the requested value %s\n",
+ sysattr->name, new_value);
+ return 0;
+ }
+ }
+ /*
+ * open O_WRONLY since some attributes have no "read" but only
+ * "write" permission
+ */
+ if ((fd = open(sysattr->path, O_WRONLY)) < 0) {
+ dprintf("Error reading attribute %s\n", sysattr->path);
+ return -1;
+ }
+
+ length = write(fd, new_value, len);
+ if (length < 0) {
+ dprintf("Error writing to the attribute %s - invalid value?\n",
+ sysattr->name);
+ close(fd);
+ return -1;
+ } else if (length != len) {
+ dprintf("Could not write %d bytes to attribute %s\n",
+ len, sysattr->name);
+ /*
+ * since we could not write user supplied number of bytes,
+ * restore the old value if one available
+ */
+ if (sysattr->method & SYSFS_METHOD_SHOW) {
+ length = write(fd, sysattr->value, sysattr->len);
+ close(fd);
+ return -1;
+ }
+ }
+
+ /*
+ * Validate length that has been copied. Alloc appropriate area
+ * in sysfs_attribute. Verify first if the attribute supports reading
+ * (show method). If it does not, do not bother
+ */
+ if (sysattr->method & SYSFS_METHOD_SHOW) {
+ if (length != sysattr->len) {
+ sysattr->value = (char *)realloc(sysattr->value,
+ length);
+ sysattr->len = length;
+ strncpy(sysattr->value, new_value, length);
+ } else {
+ /*"length" of the new value is same as old one */
+ strncpy(sysattr->value, new_value, length);
+ }
+ }
+
+ close(fd);
+ return 0;
+}
+
+
/**
* sysfs_read_attribute: reads value from attribute
* @sysattr: attribute to read
*/
int sysfs_read_attribute(struct sysfs_attribute *sysattr)
{
- char *fbuf = NULL;
- char *vbuf = NULL;
+ unsigned char *fbuf = NULL;
+ unsigned char *vbuf = NULL;
size_t length = 0;
int pgsize = 0;
int fd;
return -1;
}
if (!(sysattr->method & SYSFS_METHOD_SHOW)) {
- dprintf (stderr, "Show method not supported for attribute %s\n",
+ dprintf("Show method not supported for attribute %s\n",
sysattr->path);
return -1;
}
pgsize = getpagesize();
- fbuf = (char *)calloc(1, pgsize+1);
+ fbuf = (unsigned char *)calloc(1, pgsize+1);
if (fbuf == NULL) {
- perror("calloc");
+ dprintf("calloc failed\n");
return -1;
}
if ((fd = open(sysattr->path, O_RDONLY)) < 0) {
- dprintf (stderr, "Error reading attribute %s\n", sysattr->path);
+ dprintf("Error reading attribute %s\n", sysattr->path);
free(fbuf);
return -1;
}
length = read(fd, fbuf, pgsize);
if (length < 0) {
- dprintf (stderr, "Error reading from attribute %s\n",
- sysattr->path);
+ dprintf("Error reading from attribute %s\n", sysattr->path);
close(fd);
free(fbuf);
return -1;
}
sysattr->len = length;
close(fd);
- vbuf = (char *)realloc(fbuf, length+1);
+ vbuf = (unsigned char *)realloc(fbuf, length+1);
if (vbuf == NULL) {
- perror("realloc");
+ dprintf("realloc failed\n");
free(fbuf);
return -1;
}
* @vsize: size of value buffer
* returns 0 with success and -1 with error.
*/
-int sysfs_read_attribute_value(const char *attrpath, char *value, size_t vsize)
+int sysfs_read_attribute_value(const unsigned char *attrpath,
+ unsigned char *value, size_t vsize)
{
struct sysfs_attribute *attr = NULL;
size_t length = 0;
attr = sysfs_open_attribute(attrpath);
if (attr == NULL) {
- dprintf(stderr, "Invalid attribute path %s\n", attrpath);
+ dprintf("Invalid attribute path %s\n", attrpath);
errno = EINVAL;
return -1;
}
if((sysfs_read_attribute(attr)) != 0 || attr->value == NULL) {
- dprintf(stderr, "Error reading from attribute %s\n", attrpath);
+ dprintf("Error reading from attribute %s\n", attrpath);
sysfs_close_attribute(attr);
return -1;
}
length = strlen(attr->value);
if (length > vsize)
- dprintf(stderr,
- "Value length %d is larger than supplied buffer %d\n",
+ dprintf("Value length %d is larger than supplied buffer %d\n",
length, vsize);
strncpy(value, attr->value, vsize);
sysfs_close_attribute(attr);
* attribute name, return its value
* @attr: attribute to search
* @name: name to look for
- * returns char * value - could be NULL
+ * returns unsigned char * value - could be NULL
*/
-char *sysfs_get_value_from_attributes(struct sysfs_attribute *attr,
- const char *name)
+unsigned char *sysfs_get_value_from_attributes(struct dlist *attr,
+ const unsigned char *name)
{
struct sysfs_attribute *cur = NULL;
- char tmpname[SYSFS_NAME_LEN];
if (attr == NULL || name == NULL) {
errno = EINVAL;
return NULL;
- }
- cur = attr;
- while (cur != NULL) {
- memset(tmpname, 0, SYSFS_NAME_LEN);
- if ((sysfs_get_name_from_path(cur->path, tmpname,
- SYSFS_NAME_LEN)) != 0) {
- cur = cur->next;
- continue;
- }
- if (strcmp(tmpname, name) == 0)
+ }
+ dlist_for_each_data(attr, cur, struct sysfs_attribute) {
+ if (strcmp(cur->name, name) == 0)
return cur->value;
- cur = cur->next;
}
return NULL;
}
/**
- * add_subdir_to_dir: adds subdirectory to directory's subdirs
- * @sysdir: directory to add subdir to
- * @subdir: subdirectory to add.
+ * sysfs_close_link: closes and cleans up link.
+ * @ln: link to close.
*/
-static void add_subdir_to_dir(struct sysfs_directory *sysdir,
- struct sysfs_directory *subdir)
+void sysfs_close_link(struct sysfs_link *ln)
{
- if (sysdir != NULL && subdir != NULL) {
- subdir->next = sysdir->subdirs;
- sysdir->subdirs = subdir;
- }
-}
-
-/**
- * add_attr_to_dir: adds attribute to directory's attributes
- * @sysdir: directory to add attribute to
- * @sysattr: attribute to add.
- */
-static void add_attr_to_dir(struct sysfs_directory *sysdir,
- struct sysfs_attribute *sysattr)
-{
- if (sysdir != NULL && sysattr != NULL) {
- sysattr->next = sysdir->attributes;
- sysdir->attributes = sysattr;
- }
-}
-
-/**
- * sysfs_close_dlink: closes and cleans up directory link.
- * @dlink: directory link to close.
- */
-void sysfs_close_dlink(struct sysfs_dlink *dlink)
-{
- if (dlink != NULL) {
- dlink->next = NULL;
- if (dlink->target != NULL)
- sysfs_close_directory(dlink->target);
- free(dlink);
- }
-}
-
-/**
- * add_dlink_to_dir: adds directory link to directory's links list.
- * @sysdir: directory to add it to.
- * @dlink: link to add.
- */
-static void add_dlink_to_dir(struct sysfs_directory *sysdir,
- struct sysfs_dlink *dlink)
-{
- if (sysdir != NULL && dlink != NULL) {
- dlink->next = sysdir->links;
- sysdir->links = dlink;
- }
+ if (ln != NULL)
+ free(ln);
}
/**
*/
void sysfs_close_directory(struct sysfs_directory *sysdir)
{
- struct sysfs_directory *sdir = NULL, *dnext = NULL;
- struct sysfs_dlink *dlink = NULL, *nextl = NULL;
- struct sysfs_attribute *attr = NULL, *anext = NULL;
-
if (sysdir != NULL) {
- if (sysdir->subdirs != NULL) {
- for (sdir = sysdir->subdirs; sdir != NULL;
- sdir = dnext) {
- dnext = sdir->next;
- sysfs_close_directory(sdir);
- }
- }
- if (sysdir->links != NULL) {
- for (dlink = sysdir->links; dlink != NULL;
- dlink = nextl) {
- nextl = dlink->next;
- sysfs_close_dlink(dlink);
- }
- }
- if (sysdir->attributes != NULL) {
- for (attr = sysdir->attributes; attr != NULL;
- attr = anext) {
- anext = attr->next;
- /* sysfs_close_attribute(attr); */
- if (attr->value != NULL)
- free(attr->value);
- free(attr);
- }
- }
+ if (sysdir->subdirs != NULL)
+ dlist_destroy(sysdir->subdirs);
+ if (sysdir->links != NULL)
+ dlist_destroy(sysdir->links);
+ if (sysdir->attributes != NULL)
+ dlist_destroy(sysdir->attributes);
free(sysdir);
}
}
}
/**
- * alloc_dlink: allocates and initializes directory link structure
- * returns struct sysfs_dlink with success or NULL with error.
+ * alloc_link: allocates and initializes link structure
+ * returns struct sysfs_link with success or NULL with error.
+ */
+static struct sysfs_link *alloc_link(void)
+{
+ return (struct sysfs_link *)calloc(1, sizeof(struct sysfs_link));
+}
+
+/**
+ * sysfs_read_all_subdirs: calls sysfs_read_directory for all subdirs
+ * @sysdir: directory whose subdirs need reading.
+ * returns 0 with success and -1 with error.
*/
-static struct sysfs_dlink *alloc_dlink(void)
+int sysfs_read_all_subdirs(struct sysfs_directory *sysdir)
{
- return (struct sysfs_dlink *)calloc(1, sizeof(struct sysfs_dlink));
+ struct sysfs_directory *cursub = NULL;
+
+ if (sysdir == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (sysdir->subdirs == NULL)
+ return 0;
+ dlist_for_each_data(sysdir->subdirs, cursub, struct sysfs_directory) {
+ if (sysfs_read_directory(cursub) != 0)
+ dprintf ("Error reading subdirectory %s\n",
+ cursub->name);
+ }
+ return 0;
}
/**
* @path: path of directory to open.
* returns: struct sysfs_directory * with success and NULL on error.
*/
-struct sysfs_directory *sysfs_open_directory(const char *path)
+struct sysfs_directory *sysfs_open_directory(const unsigned char *path)
{
struct sysfs_directory *sdir = NULL;
}
sdir = alloc_directory();
if (sdir == NULL) {
- dprintf(stderr, "Error allocating directory %s\n", path);
+ dprintf("Error allocating directory %s\n", path);
+ return NULL;
+ }
+ if (sysfs_get_name_from_path(path, sdir->name, SYSFS_NAME_LEN) != 0) {
+ dprintf("Error getting directory name from path: %s\n", path);
+ sysfs_close_directory(sdir);
return NULL;
}
strncpy(sdir->path, path, sizeof(sdir->path));
}
/**
- * sysfs_open_dlink: opens a sysfs directory link, creates struct, and returns
+ * sysfs_open_link: opens a sysfs link, creates struct, and returns
* @path: path of link to open.
- * returns: struct sysfs_dlink * with success and NULL on error.
+ * returns: struct sysfs_link * with success and NULL on error.
*/
-struct sysfs_dlink *sysfs_open_dlink(const char *linkpath)
+struct sysfs_link *sysfs_open_link(const unsigned char *linkpath)
{
- struct sysfs_dlink *dlink = NULL;
- struct sysfs_directory *tdir = NULL;
- char name[SYSFS_NAME_LEN];
- char target[SYSFS_PATH_MAX];
+ struct sysfs_link *ln = NULL;
- if (linkpath == NULL) {
+ if (linkpath == NULL || strlen(linkpath) > SYSFS_PATH_MAX) {
errno = EINVAL;
return NULL;
}
- memset(name, 0, SYSFS_NAME_LEN);
- memset(target, 0, SYSFS_PATH_MAX);
- if ((sysfs_get_name_from_path(linkpath, name, SYSFS_NAME_LEN)) != 0
- || (sysfs_get_link(linkpath, target, SYSFS_PATH_MAX)) != 0) {
- errno = EINVAL;
- dprintf(stderr, "Invalid link path %s\n", linkpath);
+ ln = alloc_link();
+ if (ln == NULL) {
+ dprintf("Error allocating link %s\n", linkpath);
return NULL;
}
- dlink = alloc_dlink();
- if (dlink == NULL) {
- dprintf(stderr,
- "Error allocating directory link %s\n", linkpath);
+ strcpy(ln->path, linkpath);
+ if ((sysfs_get_name_from_path(linkpath, ln->name, SYSFS_NAME_LEN)) != 0
+ || (sysfs_get_link(linkpath, ln->target, SYSFS_PATH_MAX)) != 0) {
+ errno = EINVAL;
+ dprintf("Invalid link path %s\n", linkpath);
return NULL;
}
- strcpy(dlink->name, name);
- tdir = sysfs_open_directory(target);
- if (tdir == NULL) {
- dprintf(stderr, "Invalid directory link target %s\n", target);
- sysfs_close_dlink(dlink);
- return NULL;
- }
- dlink->target = tdir;
- return dlink;
+ return ln;
}
/**
struct stat astats;
struct sysfs_attribute *attr = NULL;
struct sysfs_directory *subdir = NULL;
- struct sysfs_dlink *dlink = NULL;
- char file_path[SYSFS_PATH_MAX];
+ struct sysfs_link *ln = NULL;
+ unsigned char file_path[SYSFS_PATH_MAX];
int retval = 0;
if (sysdir == NULL) {
}
dir = opendir(sysdir->path);
if (dir == NULL) {
- perror("opendir");
+ dprintf("Error opening directory %s\n", sysdir->path);
return -1;
}
while(((dirent = readdir(dir)) != NULL) && retval == 0) {
strncat(file_path, "/", sizeof(file_path));
strncat(file_path, dirent->d_name, sizeof(file_path));
if ((lstat(file_path, &astats)) != 0) {
- perror("stat");
+ dprintf("stat failed\n");
continue;
}
if (S_ISREG(astats.st_mode)) {
attr = sysfs_open_attribute(file_path);
if (attr == NULL) {
- dprintf (stderr, "Error opening attribute %s\n",
+ dprintf("Error opening attribute %s\n",
file_path);
retval = -1;
break;
}
if (attr->method & SYSFS_METHOD_SHOW) {
if ((sysfs_read_attribute(attr)) != 0) {
- dprintf (stderr,
- "Error reading attribute %s\n",
+ dprintf("Error reading attribute %s\n",
file_path);
sysfs_close_attribute(attr);
continue;
}
}
- add_attr_to_dir(sysdir, attr);
+
+ if (sysdir->attributes == NULL) {
+ sysdir->attributes = dlist_new_with_delete
+ (sizeof(struct sysfs_attribute),
+ sysfs_del_attribute);
+ }
+ dlist_unshift(sysdir->attributes, attr);
} else if (S_ISDIR(astats.st_mode)) {
subdir = sysfs_open_directory(file_path);
if (subdir == NULL) {
- dprintf (stderr, "Error opening directory %s\n",
+ dprintf("Error opening directory %s\n",
file_path);
retval = -1;
break;
}
- add_subdir_to_dir(sysdir, subdir);
+ if (sysdir->subdirs == NULL)
+ sysdir->subdirs = dlist_new_with_delete
+ (sizeof(struct sysfs_directory),
+ sysfs_del_directory);
+ dlist_unshift(sysdir->subdirs, subdir);
} else if (S_ISLNK(astats.st_mode)) {
- dlink = sysfs_open_dlink(file_path);
- if (dlink == NULL) {
- dprintf(stderr, "Error opening link %s\n",
- file_path);
+ ln = sysfs_open_link(file_path);
+ if (ln == NULL) {
+ dprintf("Error opening link %s\n", file_path);
retval = -1;
break;
}
- add_dlink_to_dir(sysdir, dlink);
+ if (sysdir->links == NULL)
+ sysdir->links = dlist_new_with_delete
+ (sizeof(struct sysfs_link),
+ sysfs_del_link);
+ dlist_unshift(sysdir->links, ln);
}
}
closedir(dir);
}
/**
- * sysfs_read_dlinks: reads a directory link's target directory. Can
- * supply a linked list of links.
- * @dlink: directory link to read.
- * returns 0 with success or -1 with error.
+ * sysfs_get_directory_attribute: retrieves attribute attrname
+ * @dir: directory to retrieve attribute from
+ * @attrname: name of attribute to look for
+ * returns sysfs_attribute if found and NULL if not found
*/
-int sysfs_read_dlinks(struct sysfs_dlink *dlink)
+struct sysfs_attribute *sysfs_get_directory_attribute
+ (struct sysfs_directory *dir, unsigned char *attrname)
{
- struct sysfs_dlink *cur = NULL;
+ struct sysfs_directory *sdir = NULL;
+ struct sysfs_attribute *attr = NULL;
+
+ if (dir == NULL || attrname == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ attr = (struct sysfs_attribute *)dlist_find_custom(dir->attributes,
+ attrname, dir_attribute_name_equal);
+ if (attr != NULL)
+ return attr;
+
+ if (dir->subdirs != NULL) {
+ dlist_for_each_data(dir->subdirs, sdir,
+ struct sysfs_directory) {
+ if (sdir->attributes == NULL)
+ continue;
+ attr = sysfs_get_directory_attribute(sdir, attrname);
+ if (attr != NULL)
+ return attr;
+ }
+ }
+ return NULL;
+}
- if (dlink == NULL || dlink->target == NULL) {
+/**
+ * sysfs_get_directory_link: retrieves link from one directory list
+ * @dir: directory to retrieve link from
+ * @linkname: name of link to look for
+ * returns reference to sysfs_link if found and NULL if not found
+ */
+struct sysfs_link *sysfs_get_directory_link
+ (struct sysfs_directory *dir, unsigned char *linkname)
+{
+ if (dir == NULL || linkname == NULL) {
errno = EINVAL;
- return -1;
+ return NULL;
}
- cur = dlink;
- while (cur != NULL) {
- if ((sysfs_read_directory(cur->target)) != 0) {
- dprintf(stderr,
- "Error reading directory link target %s\n",
- dlink->name);
- return -1;
+ return (struct sysfs_link *)dlist_find_custom(dir->links,
+ linkname, dir_link_name_equal);
+}
+
+/**
+ * sysfs_get_subdirectory: retrieves subdirectory by name.
+ * @dir: directory to search for subdirectory.
+ * @subname: subdirectory name to get.
+ * returns reference to subdirectory or NULL if not found
+ */
+struct sysfs_directory *sysfs_get_subdirectory(struct sysfs_directory *dir,
+ unsigned char *subname)
+{
+ struct sysfs_directory *sub = NULL, *cursub = NULL;
+
+ if (dir == NULL || dir->subdirs == NULL || subname == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+ sub = (struct sysfs_directory *)dlist_find_custom(dir->subdirs,
+ subname, dir_subdir_name_equal);
+ if (sub != NULL)
+ return sub;
+
+ if (dir->subdirs != NULL) {
+ dlist_for_each_data(dir->subdirs, cursub,
+ struct sysfs_directory) {
+ if (cursub->subdirs == NULL)
+ continue;
+ sub = sysfs_get_subdirectory(cursub, subname);
+ if (sub != NULL)
+ return sub;
}
- cur = cur->next;
}
-
- return 0;
+ return NULL;
+}
+
+/**
+ * sysfs_get_subdirectory_link: looks through all subdirs for specific link.
+ * @dir: directory and subdirectories to search for link.
+ * @linkname: link name to get.
+ * returns reference to link or NULL if not found
+ */
+struct sysfs_link *sysfs_get_subdirectory_link(struct sysfs_directory *dir,
+ unsigned char *linkname)
+{
+ struct sysfs_directory *cursub = NULL;
+ struct sysfs_link *ln = NULL;
+
+ if (dir == NULL || dir->links == NULL || linkname == NULL) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ ln = sysfs_get_directory_link(dir, linkname);
+ if (ln != NULL)
+ return ln;
+
+ if (dir->subdirs == NULL)
+ return NULL;
+
+ if (dir->subdirs != NULL) {
+ dlist_for_each_data(dir->subdirs, cursub,
+ struct sysfs_directory) {
+ if (cursub->subdirs == NULL)
+ continue;
+ ln = sysfs_get_subdirectory_link(cursub, linkname);
+ if (ln != NULL)
+ return ln;
+ }
+ }
+ return NULL;
}
~ianmdlvl / elogind.git / blobdiff