}
/* it is a new device */
- dbg("'%s'", devpath_real);
+ dbg("new uncached device '%s'", devpath_real);
dev = malloc(sizeof(struct sysfs_device));
if (dev == NULL)
return NULL;
int len;
int back;
+ dbg("open '%s'", dev->devpath);
+
+ /* look if we already know the parent */
if (dev->parent != NULL)
return dev->parent;
return NULL;
pos[0] = '\0';
- /* are we at the top level */
+ /* are we at the top level of /devices */
if (strcmp(parent_devpath, "/devices") == 0) {
dbg("/devices top level");
return NULL;
goto device_link;
}
}
+ /* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath);
return dev->parent;
strlcat(parent_devpath, "/", sizeof(parent_devpath));
strlcat(parent_devpath, &device_link_target[back * 3], sizeof(parent_devpath));
+ /* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath);
return dev->parent;
}
ssize_t size;
size_t sysfs_len;
+ dbg("open '%s'/'%s'", devpath, attr_name);
sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
path = &path_full[sysfs_len];
strlcat(path_full, devpath, sizeof(path_full));
}
/* store attribute in cache (also negatives are kept in cache) */
+ dbg("new uncached attribute '%s'", path_full);
attr = malloc(sizeof(struct sysfs_attr));
if (attr == NULL)
return NULL;
memset(attr, 0x00, sizeof(struct sysfs_attr));
strlcpy(attr->path, path, sizeof(attr->path));
- dbg("add to cache '%s' '%s'", attr->path, attr->value);
+ dbg("add to cache '%s'", path_full);
list_add(&attr->node, &attr_list);
/* read attribute value */
fd = open(path_full, O_RDONLY);
- if (fd < 0)
+ if (fd < 0) {
+ dbg("attribute '%s' does not exist", path_full);
goto out;
+ }
size = read(fd, value, sizeof(value));
close(fd);
if (size < 0)
/* got a valid value, store and return it */
value[size] = '\0';
remove_trailing_chars(value, '\n');
+ dbg("cache '%s' with value '%s'", path_full, value);
strlcpy(attr->value_local, value, sizeof(attr->value_local));
attr->value = attr->value_local;