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libudev: allow to get list of all available sysfs attrs for a device

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Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
This commit is contained in:
Thomas Egerer 2011-03-04 17:06:41 +01:00 committed by Kay Sievers
parent 30c2b6f10f
commit f180ad259f
3 changed files with 83 additions and 0 deletions
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1
libudev/exported_symbols
View File

@ -32,6 +32,7 @@ udev_device_get_is_initialized
udev_device_get_devlinks_list_entry
udev_device_get_properties_list_entry
udev_device_get_tags_list_entry
udev_device_get_sysattr_list_entry
udev_device_get_property_value
udev_device_get_action
udev_device_get_driver

81
libudev/libudev-device.c
View File

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

1
libudev/libudev.h
View File

@ -92,6 +92,7 @@ int udev_device_get_is_initialized(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device);
const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key);
const char *udev_device_get_driver(struct udev_device *udev_device);
dev_t udev_device_get_devnum(struct udev_device *udev_device);