/*
- * syfs_dir.c
+ * sysfs_dir.c
*
* Directory utility functions for libsysfs
*
sysfs_close_attribute(sysattr);
return NULL;
}
- strncpy(sysattr->path, path, sizeof(sysattr->path));
+ strncpy(sysattr->path, path, SYSFS_PATH_MAX);
if ((stat(sysattr->path, &fileinfo)) != 0) {
dprintf("Stat failed: No such attribute?\n");
sysattr->method = 0;
return -1;
}
if (sysattr->method & SYSFS_METHOD_SHOW) {
+ /*
+ * read attribute again to see if we can get an updated value
+ */
+ if ((sysfs_read_attribute(sysattr)) != 0) {
+ dprintf("Error reading attribute\n");
+ return -1;
+ }
if ((strncmp(sysattr->value, new_value, sysattr->len)) == 0) {
dprintf("Attribute %s already has the requested value %s\n",
sysattr->name, new_value);
{
unsigned char *fbuf = NULL;
unsigned char *vbuf = NULL;
- size_t length = 0;
- int pgsize = 0;
+ ssize_t length = 0;
+ long pgsize = 0;
int fd;
if (sysattr == NULL) {
sysattr->path);
return -1;
}
- pgsize = getpagesize();
+#ifdef __KLIBC__
+ pgsize = 0x1000;
+#else
+ pgsize = sysconf(_SC_PAGESIZE);
+#endif
fbuf = (unsigned char *)calloc(1, pgsize+1);
if (fbuf == NULL) {
dprintf("calloc failed\n");
free(fbuf);
return -1;
}
+ if (sysattr->len > 0) {
+ if ((sysattr->len == length) &&
+ (!(strncmp(sysattr->value, fbuf, length)))) {
+ close(fd);
+ return 0;
+ }
+ free(sysattr->value);
+ }
sysattr->len = length;
close(fd);
vbuf = (unsigned char *)realloc(fbuf, length+1);
if (sysdir->attributes != NULL)
dlist_destroy(sysdir->attributes);
free(sysdir);
+ 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);
+ if (sysdir->subdirs == NULL)
+ if ((sysfs_read_dir_subdirs(sysdir)) != 0)
+ return 0;
+ if (sysdir->subdirs != NULL) {
+ dlist_for_each_data(sysdir->subdirs, cursub,
+ struct sysfs_directory) {
+ if ((sysfs_read_dir_subdirs(cursub)) != 0)
+ dprintf ("Error reading subdirectory %s\n",
+ cursub->name);
+ }
}
return 0;
}
sysfs_close_directory(sdir);
return NULL;
}
- strncpy(sdir->path, path, sizeof(sdir->path));
+ strncpy(sdir->path, path, SYSFS_PATH_MAX);
return sdir;
}
}
/**
- * sysfs_read_directory: grabs attributes, links, and subdirectories
+ * sysfs_refresh_attributes: Refresh attributes list
+ * @attrlist: list of attributes to refresh
+ * Returns 0 on success, 1 on failure
+ */
+int sysfs_refresh_attributes(struct dlist *attrlist)
+{
+ struct sysfs_attribute *attr = NULL;
+
+ if (attrlist == NULL) {
+ errno = EINVAL;
+ return 1;
+ }
+ dlist_for_each_data(attrlist, attr, struct sysfs_attribute) {
+ if (attr->method & SYSFS_METHOD_SHOW) {
+ if ((sysfs_read_attribute(attr)) != 0) {
+ dprintf("Error reading attribute %s\n",
+ attr->path);
+ if ((sysfs_path_is_file(attr->path)) != 0) {
+ dprintf("Attr %s no longer exists\n",
+ attr->name);
+ }
+ }
+ } else {
+ if ((sysfs_path_is_file(attr->path)) != 0) {
+ dprintf("Attr %s no longer exists\n",
+ attr->name);
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * add_attribute: open and add attribute at path to given directory
+ * @sysdir: directory to add attribute to
+ * @path: path to attribute
+ * returns 0 with success and -1 with error.
+ */
+static int add_attribute(struct sysfs_directory *sysdir,
+ const unsigned char *path)
+{
+ struct sysfs_attribute *attr = NULL;
+
+ attr = sysfs_open_attribute(path);
+ if (attr == NULL) {
+ dprintf("Error opening attribute %s\n", path);
+ return -1;
+ }
+ if (attr->method & SYSFS_METHOD_SHOW) {
+ if ((sysfs_read_attribute(attr)) != 0) {
+ dprintf("Error reading attribute %s\n", path);
+ sysfs_close_attribute(attr);
+ return 0;
+ }
+ }
+
+ if (sysdir->attributes == NULL) {
+ sysdir->attributes = dlist_new_with_delete
+ (sizeof(struct sysfs_attribute), sysfs_del_attribute);
+ }
+ dlist_unshift(sysdir->attributes, attr);
+
+ return 0;
+}
+
+/**
+ * add_subdirectory: open and add subdirectory at path to given directory
+ * @sysdir: directory to add subdir to
+ * @path: path to subdirectory
+ * returns 0 with success and -1 with error.
+ */
+static int add_subdirectory(struct sysfs_directory *sysdir,
+ const unsigned char *path)
+{
+ struct sysfs_directory *subdir = NULL;
+
+ subdir = sysfs_open_directory(path);
+ if (subdir == NULL) {
+ dprintf("Error opening directory %s\n", path);
+ return -1;
+ }
+ if (sysdir->subdirs == NULL)
+ sysdir->subdirs = dlist_new_with_delete
+ (sizeof(struct sysfs_directory), sysfs_del_directory);
+ dlist_unshift(sysdir->subdirs, subdir);
+ return 0;
+}
+
+/**
+ * add_link: open and add link at path to given directory
+ * @sysdir: directory to add link to
+ * @path: path to link
+ * returns 0 with success and -1 with error.
+ */
+static int add_link(struct sysfs_directory *sysdir, const unsigned char *path)
+{
+ struct sysfs_link *ln = NULL;
+
+ ln = sysfs_open_link(path);
+ if (ln == NULL) {
+ dprintf("Error opening link %s\n", path);
+ return -1;
+ }
+ if (sysdir->links == NULL)
+ sysdir->links = dlist_new_with_delete
+ (sizeof(struct sysfs_link), sysfs_del_link);
+ dlist_unshift(sysdir->links, ln);
+ return 0;
+}
+
+/**
+ * sysfs_read_dir_attributes: grabs attributes for the given directory
* @sysdir: sysfs directory to open
* returns 0 with success and -1 with error.
*/
-int sysfs_read_directory(struct sysfs_directory *sysdir)
+int sysfs_read_dir_attributes(struct sysfs_directory *sysdir)
{
DIR *dir = NULL;
struct dirent *dirent = NULL;
struct stat astats;
- struct sysfs_attribute *attr = NULL;
- struct sysfs_directory *subdir = NULL;
- struct sysfs_link *ln = NULL;
unsigned char file_path[SYSFS_PATH_MAX];
int retval = 0;
if (0 == strcmp(dirent->d_name, ".."))
continue;
memset(file_path, 0, SYSFS_PATH_MAX);
- strncpy(file_path, sysdir->path, sizeof(file_path));
- strncat(file_path, "/", sizeof(file_path));
- strncat(file_path, dirent->d_name, sizeof(file_path));
+ strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
+ strcat(file_path, "/");
+ strcat(file_path, dirent->d_name);
if ((lstat(file_path, &astats)) != 0) {
dprintf("stat failed\n");
continue;
}
- if (S_ISREG(astats.st_mode)) {
- attr = sysfs_open_attribute(file_path);
- if (attr == NULL) {
- dprintf("Error opening attribute %s\n",
- file_path);
- retval = -1;
- break;
- }
- if (attr->method & SYSFS_METHOD_SHOW) {
- if ((sysfs_read_attribute(attr)) != 0) {
- dprintf("Error reading attribute %s\n",
- file_path);
- sysfs_close_attribute(attr);
- continue;
- }
- }
-
- 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("Error opening directory %s\n",
- file_path);
- retval = -1;
- break;
- }
- 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)) {
- ln = sysfs_open_link(file_path);
- if (ln == NULL) {
- dprintf("Error opening link %s\n", file_path);
- retval = -1;
+ if (S_ISREG(astats.st_mode))
+ retval = add_attribute(sysdir, file_path);
+ }
+ closedir(dir);
+ return(retval);
+}
+
+/**
+ * sysfs_read_dir_links: grabs links in a specific directory
+ * @sysdir: sysfs directory to read links
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_dir_links(struct sysfs_directory *sysdir)
+{
+ DIR *dir = NULL;
+ struct dirent *dirent = NULL;
+ struct stat astats;
+ unsigned char file_path[SYSFS_PATH_MAX];
+ int retval = 0;
+
+ if (sysdir == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ dir = opendir(sysdir->path);
+ if (dir == NULL) {
+ dprintf("Error opening directory %s\n", sysdir->path);
+ return -1;
+ }
+ while(((dirent = readdir(dir)) != NULL) && retval == 0) {
+ if (0 == strcmp(dirent->d_name, "."))
+ continue;
+ if (0 == strcmp(dirent->d_name, ".."))
+ continue;
+ memset(file_path, 0, SYSFS_PATH_MAX);
+ strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
+ strcat(file_path, "/");
+ strcat(file_path, dirent->d_name);
+ if ((lstat(file_path, &astats)) != 0) {
+ dprintf("stat failed\n");
+ continue;
+ }
+ if (S_ISLNK(astats.st_mode)) {
+ retval = add_link(sysdir, file_path);
+ if (retval != 0)
break;
- }
- 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_get_directory_attribute: retrieves attribute attrname
+ * sysfs_read_dir_subdirs: grabs subdirs in a specific directory
+ * @sysdir: sysfs directory to read links
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_dir_subdirs(struct sysfs_directory *sysdir)
+{
+ DIR *dir = NULL;
+ struct dirent *dirent = NULL;
+ struct stat astats;
+ unsigned char file_path[SYSFS_PATH_MAX];
+ int retval = 0;
+
+ if (sysdir == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ dir = opendir(sysdir->path);
+ if (dir == NULL) {
+ dprintf("Error opening directory %s\n", sysdir->path);
+ return -1;
+ }
+ while(((dirent = readdir(dir)) != NULL) && retval == 0) {
+ if (0 == strcmp(dirent->d_name, "."))
+ continue;
+ if (0 == strcmp(dirent->d_name, ".."))
+ continue;
+ memset(file_path, 0, SYSFS_PATH_MAX);
+ strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
+ strcat(file_path, "/");
+ strcat(file_path, dirent->d_name);
+ if ((lstat(file_path, &astats)) != 0) {
+ dprintf("stat failed\n");
+ continue;
+ }
+ if (S_ISDIR(astats.st_mode))
+ retval = add_subdirectory(sysdir, file_path);
+ }
+ closedir(dir);
+ return(retval);
+}
+
+/**
+ * sysfs_read_directory: grabs attributes, links, and subdirectories
+ * @sysdir: sysfs directory to open
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_read_directory(struct sysfs_directory *sysdir)
+{
+ DIR *dir = NULL;
+ struct dirent *dirent = NULL;
+ struct stat astats;
+ unsigned char file_path[SYSFS_PATH_MAX];
+ int retval = 0;
+
+ if (sysdir == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ dir = opendir(sysdir->path);
+ if (dir == NULL) {
+ dprintf("Error opening directory %s\n", sysdir->path);
+ return -1;
+ }
+ while(((dirent = readdir(dir)) != NULL) && retval == 0) {
+ if (0 == strcmp(dirent->d_name, "."))
+ continue;
+ if (0 == strcmp(dirent->d_name, ".."))
+ continue;
+ memset(file_path, 0, SYSFS_PATH_MAX);
+ strncpy(file_path, sysdir->path, SYSFS_PATH_MAX);
+ strcat(file_path, "/");
+ strcat(file_path, dirent->d_name);
+ if ((lstat(file_path, &astats)) != 0) {
+ dprintf("stat failed\n");
+ continue;
+ }
+ if (S_ISDIR(astats.st_mode))
+ retval = add_subdirectory(sysdir, file_path);
+
+ else if (S_ISLNK(astats.st_mode))
+ retval = add_link(sysdir, file_path);
+
+ else if (S_ISREG(astats.st_mode))
+ retval = add_attribute(sysdir, file_path);
+ }
+ closedir(dir);
+ return(retval);
+}
+
+/**
+ * sysfs_get_directory_attribute: retrieves attribute attrname from current
+ * directory only
* @dir: directory to retrieve attribute from
* @attrname: name of attribute to look for
* returns sysfs_attribute if found and NULL if not found
struct sysfs_attribute *sysfs_get_directory_attribute
(struct sysfs_directory *dir, unsigned char *attrname)
{
- struct sysfs_directory *sdir = NULL;
struct sysfs_attribute *attr = NULL;
+ unsigned char new_path[SYSFS_PATH_MAX];
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;
+
+ if (dir->attributes == NULL)
+ if ((sysfs_read_dir_attributes(dir) != 0)
+ || (dir->attributes == NULL))
+ return NULL;
+
+ attr = (struct sysfs_attribute *)dlist_find_custom
+ (dir->attributes, attrname, dir_attribute_name_equal);
+ if (attr == NULL) {
+ memset(new_path, 0, SYSFS_PATH_MAX);
+ strcpy(new_path, dir->path);
+ strcat(new_path, "/");
+ strcat(new_path, attrname);
+ if ((sysfs_path_is_file(new_path)) == 0) {
+ if ((add_attribute(dir, new_path)) == 0) {
+ attr = (struct sysfs_attribute *)
+ dlist_find_custom(dir->attributes,
+ attrname, dir_attribute_name_equal);
+ }
}
}
- return NULL;
+ return attr;
}
/**
errno = EINVAL;
return NULL;
}
+ if (dir->links == NULL)
+ if ((sysfs_read_dir_links(dir) != 0) || (dir->links == NULL))
+ return NULL;
+
return (struct sysfs_link *)dlist_find_custom(dir->links,
linkname, dir_link_name_equal);
}
{
struct sysfs_directory *sub = NULL, *cursub = NULL;
- if (dir == NULL || dir->subdirs == NULL || subname == NULL) {
+ if (dir == NULL || subname == NULL) {
errno = EINVAL;
return NULL;
}
+
+ if (dir->subdirs == NULL)
+ if (sysfs_read_dir_subdirs(dir) != 0)
+ return NULL;
+
sub = (struct sysfs_directory *)dlist_find_custom(dir->subdirs,
subname, dir_subdir_name_equal);
if (sub != NULL)
if (dir->subdirs != NULL) {
dlist_for_each_data(dir->subdirs, cursub,
struct sysfs_directory) {
- if (cursub->subdirs == NULL)
- continue;
+ if (cursub->subdirs == NULL) {
+ if (sysfs_read_dir_subdirs(cursub) != 0)
+ continue;
+ if (cursub->subdirs == NULL)
+ continue;
+ }
sub = sysfs_get_subdirectory(cursub, subname);
if (sub != NULL)
return sub;
struct sysfs_directory *cursub = NULL;
struct sysfs_link *ln = NULL;
- if (dir == NULL || dir->links == NULL || linkname == NULL) {
+ if (dir == NULL || linkname == NULL) {
errno = EINVAL;
return NULL;
}
if (ln != NULL)
return ln;
- if (dir->subdirs == NULL)
- return NULL;
+ if (dir->subdirs == NULL)
+ if (sysfs_read_dir_subdirs(dir) != 0)
+ 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;
~ianmdlvl / elogind.git / blobdiff