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https://github.com/systemd/systemd.git
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libudev: allow to get list of all available sysfs attrs for a device
Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
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30c2b6f10f
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@ -32,6 +32,7 @@ udev_device_get_is_initialized
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udev_device_get_devlinks_list_entry
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udev_device_get_properties_list_entry
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udev_device_get_tags_list_entry
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udev_device_get_sysattr_list_entry
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udev_device_get_property_value
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udev_device_get_action
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udev_device_get_driver
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@ -61,6 +61,7 @@ struct udev_device {
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struct udev_list_node devlinks_list;
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struct udev_list_node properties_list;
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struct udev_list_node sysattr_list;
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struct udev_list_node available_sysattr_list;
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struct udev_list_node tags_list;
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unsigned long long int seqnum;
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unsigned long long int usec_initialized;
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@ -83,6 +84,7 @@ struct udev_device {
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bool db_loaded;
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bool uevent_loaded;
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bool is_initialized;
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bool sysattrs_cached;
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};
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struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
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@ -361,6 +363,7 @@ struct udev_device *udev_device_new(struct udev *udev)
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udev_list_init(&udev_device->devlinks_list);
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udev_list_init(&udev_device->properties_list);
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udev_list_init(&udev_device->sysattr_list);
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udev_list_init(&udev_device->available_sysattr_list);
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udev_list_init(&udev_device->tags_list);
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udev_device->event_timeout = -1;
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udev_device->watch_handle = -1;
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@ -785,6 +788,7 @@ void udev_device_unref(struct udev_device *udev_device)
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udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
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udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
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udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
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udev_list_cleanup_entries(udev_device->udev, &udev_device->available_sysattr_list);
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udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
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free(udev_device->action);
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free(udev_device->driver);
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@ -1235,6 +1239,83 @@ out:
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return val;
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}
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static int udev_device_cache_sysattrs(struct udev_device *udev_device)
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{
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struct dirent *entry;
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DIR *dir;
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int num = 0;
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if (udev_device == NULL)
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return -1;
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/* caching already done? */
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if (udev_device->sysattrs_cached)
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return 0;
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dir = opendir(udev_device_get_syspath(udev_device));
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if (!dir) {
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dbg(udev_device->udev, "sysfs dir '%s' can not be opened\n",
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udev_device_get_syspath(udev_device));
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return -1;
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}
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while (NULL != (entry = readdir(dir))) {
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char path[UTIL_PATH_SIZE];
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struct stat statbuf;
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/* only handle symlinks and regular files */
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if (DT_LNK != entry->d_type && DT_REG != entry->d_type)
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continue;
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util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device),
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"/", entry->d_name, NULL);
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if (0 != lstat(path, &statbuf))
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continue;
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if (0 == (statbuf.st_mode & S_IRUSR))
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continue;
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if (DT_LNK == entry->d_type) {
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if (strcmp(entry->d_name, "driver") != 0 &&
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strcmp(entry->d_name, "subsystem") != 0 &&
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strcmp(entry->d_name, "module") != 0)
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continue;
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}
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udev_list_entry_add(udev_device->udev,
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&udev_device->available_sysattr_list, entry->d_name,
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DT_LNK == entry->d_type ? "s" : "r", 0, 0);
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++num;
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}
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dbg(udev_device->udev, "found %d sysattrs for '%s'\n", num,
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udev_device_get_syspath(udev_device));
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udev_device->sysattrs_cached = true;
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return num;
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}
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/**
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* udev_device_get_sysattr_list_entry:
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* @udev_device: udev device
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*
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* Retrieve the list of available sysattrs, with value being empty;
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* This is to be able to read all available sysfs attributes for a particular
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* device without the necessity to access sysfs from outside libudev.
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*
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* Returns: the first entry of the property list
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**/
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struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
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{
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/* perform initial caching of sysattr list */
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if (!udev_device->sysattrs_cached) {
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int ret;
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ret = udev_device_cache_sysattrs(udev_device);
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if (0 > ret)
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return NULL;
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}
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return udev_list_get_entry(&udev_device->available_sysattr_list);
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}
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int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
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{
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const char *pos;
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@ -92,6 +92,7 @@ int udev_device_get_is_initialized(struct udev_device *udev_device);
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struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
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struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device);
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struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device);
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struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device);
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const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key);
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const char *udev_device_get_driver(struct udev_device *udev_device);
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dev_t udev_device_get_devnum(struct udev_device *udev_device);
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