/* find device node of device with highest priority */
static const char *link_find_prioritized(struct udev_device *dev, bool add, const char *stackdir, char *buf, size_t bufsize)
{
struct udev *udev = udev_device_get_udev(dev);
DIR *dir;
int priority = 0;
const char *target = NULL;
if (add) {
priority = udev_device_get_devlink_priority(dev);
util_strscpy(buf, bufsize, udev_device_get_devnode(dev));
target = buf;
}
dir = opendir(stackdir);
if (dir == NULL)
return target;
for (;;) {
struct udev_device *dev_db;
struct dirent *dent;
dent = readdir(dir);
if (dent == NULL || dent->d_name[0] == '\0')
break;
if (dent->d_name[0] == '.')
continue;
info(udev, "found '%s' claiming '%s'\n", dent->d_name, stackdir);
/* did we find ourself? */
if (strcmp(dent->d_name, udev_device_get_id_filename(dev)) == 0)
continue;
dev_db = udev_device_new_from_device_id(udev, dent->d_name);
if (dev_db != NULL) {
const char *devnode;
devnode = udev_device_get_devnode(dev_db);
if (devnode != NULL) {
dbg(udev, "compare priority of '%s'(%i) > '%s'(%i)\n", target, priority,
udev_device_get_devnode(dev_db), udev_device_get_devlink_priority(dev_db));
if (target == NULL || udev_device_get_devlink_priority(dev_db) > priority) {
info(udev, "'%s' claims priority %i for '%s'\n",
udev_device_get_syspath(dev_db), udev_device_get_devlink_priority(dev_db), stackdir);
priority = udev_device_get_devlink_priority(dev_db);
util_strscpy(buf, bufsize, devnode);
target = buf;
}
}
udev_device_unref(dev_db);
}
}
closedir(dir);
return target;
}
/* find device node of device with highest priority */
static const char *link_find_prioritized(struct udev_device *dev, bool add, const char *stackdir, char *buf, size_t bufsize) {
struct udev *udev = udev_device_get_udev(dev);
DIR *dir;
struct dirent *dent;
int priority = 0;
const char *target = NULL;
if (add) {
priority = udev_device_get_devlink_priority(dev);
strscpy(buf, bufsize, udev_device_get_devnode(dev));
target = buf;
}
dir = opendir(stackdir);
if (dir == NULL)
return target;
FOREACH_DIRENT_ALL(dent, dir, break) {
struct udev_device *dev_db;
if (dent->d_name[0] == '\0')
break;
if (dent->d_name[0] == '.')
continue;
log_debug("found '%s' claiming '%s'", dent->d_name, stackdir);
/* did we find ourself? */
if (streq(dent->d_name, udev_device_get_id_filename(dev)))
continue;
dev_db = udev_device_new_from_device_id(udev, dent->d_name);
if (dev_db != NULL) {
const char *devnode;
devnode = udev_device_get_devnode(dev_db);
if (devnode != NULL) {
if (target == NULL || udev_device_get_devlink_priority(dev_db) > priority) {
log_debug("'%s' claims priority %i for '%s'",
udev_device_get_syspath(dev_db), udev_device_get_devlink_priority(dev_db), stackdir);
priority = udev_device_get_devlink_priority(dev_db);
strscpy(buf, bufsize, devnode);
target = buf;
}
}
udev_device_unref(dev_db);
}
}
closedir(dir);
return target;
}
static void print_record(struct udev_device *device) {
const char *str;
int i;
struct udev_list_entry *list_entry;
printf("P: %s\n", udev_device_get_devpath(device));
str = udev_device_get_devnode(device);
if (str != NULL)
printf("N: %s\n", str + STRLEN("/dev/"));
i = udev_device_get_devlink_priority(device);
if (i != 0)
printf("L: %i\n", i);
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device))
printf("S: %s\n",
udev_list_entry_get_name(list_entry) + STRLEN("/dev/"));
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
printf("E: %s=%s\n",
udev_list_entry_get_name(list_entry),
udev_list_entry_get_value(list_entry));
printf("\n");
}
static int update_link(struct udev_device *dev, const char *slink, int test)
{
struct udev *udev = udev_device_get_udev(dev);
struct udev_list_node dev_list;
struct udev_list_entry *dev_entry;
char target[UTIL_PATH_SIZE];
int count;
int priority = 0;
int rc = 0;
dbg(udev, "update symlink '%s' of '%s'\n", slink, udev_device_get_syspath(dev));
udev_list_init(&dev_list);
count = name_index_get_devices(udev, slink, &dev_list);
if (count > 1)
info(udev, "found %i devices with name '%s'\n", count, slink);
/* if we don't have a reference, delete it */
if (count <= 0) {
info(udev, "no reference left, remove '%s'\n", slink);
if (!test) {
unlink(slink);
util_delete_path(udev, slink);
}
goto out;
}
/* find the device with the highest priority */
target[0] = '\0';
udev_list_entry_foreach(dev_entry, udev_list_get_entry(&dev_list)) {
const char *syspath;
struct udev_device *dev_db;
const char *devnode;
syspath = udev_list_entry_get_name(dev_entry);
dbg(udev, "found '%s' for '%s'\n", syspath, slink);
/* did we find ourself? we win, if we have the same priority */
if (strcmp(udev_device_get_syspath(dev), syspath) == 0) {
dbg(udev, "compare (our own) priority of '%s' %i >= %i\n",
udev_device_get_devpath(dev), udev_device_get_devlink_priority(dev), priority);
if (strcmp(udev_device_get_devnode(dev), slink) == 0) {
info(udev, "'%s' is our device node, database inconsistent, skip link update\n",
udev_device_get_devnode(dev));
} else if (target[0] == '\0' || udev_device_get_devlink_priority(dev) >= priority) {
priority = udev_device_get_devlink_priority(dev);
util_strlcpy(target, udev_device_get_devnode(dev), sizeof(target));
}
continue;
}
/* another device, read priority from database */
dev_db = udev_device_new_from_syspath(udev, syspath);
if (dev_db == NULL)
continue;
devnode = udev_device_get_devnode(dev_db);
if (devnode != NULL) {
if (strcmp(devnode, slink) == 0) {
info(udev, "'%s' is a device node of '%s', skip link update\n",
devnode, syspath);
} else {
dbg(udev, "compare priority of '%s' %i > %i\n",
udev_device_get_devpath(dev_db),
udev_device_get_devlink_priority(dev_db),
priority);
if (target[0] == '\0' || udev_device_get_devlink_priority(dev_db) > priority) {
priority = udev_device_get_devlink_priority(dev_db);
util_strlcpy(target, devnode, sizeof(target));
}
}
}
udev_device_unref(dev_db);
}
udev_list_cleanup_entries(udev, &dev_list);
if (target[0] == '\0') {
info(udev, "no current target for '%s' found\n", slink);
rc = 1;
goto out;
}
/* create symlink to the target with the highest priority */
info(udev, "'%s' with target '%s' has the highest priority %i, create it\n", slink, target, priority);
if (!test) {
util_create_path(udev, slink);
node_symlink(udev, target, slink);
}
out:
return rc;
}
/* find device node of device with highest priority */
static const char *link_find_prioritized(struct udev_device *dev, bool add, const char *stackdir, char *buf, size_t bufsize)
{
struct udev *udev = udev_device_get_udev(dev);
DIR *dir;
int priority = 0;
const char *target = NULL;
if (add) {
priority = udev_device_get_devlink_priority(dev);
util_strscpy(buf, bufsize, udev_device_get_devnode(dev));
target = buf;
}
dir = opendir(stackdir);
if (dir == NULL)
return target;
for (;;) {
struct udev_device *dev_db;
struct dirent *dent;
char devpath[UTIL_PATH_SIZE];
char syspath[UTIL_PATH_SIZE];
ssize_t len;
dent = readdir(dir);
if (dent == NULL || dent->d_name[0] == '\0')
break;
if (dent->d_name[0] == '.')
continue;
dbg(udev, "found '%s/%s'\n", stackdir, dent->d_name);
len = readlinkat(dirfd(dir), dent->d_name, devpath, sizeof(devpath));
if (len <= 0 || len == (ssize_t)sizeof(devpath))
continue;
devpath[len] = '\0';
util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
info(udev, "found '%s' claiming '%s'\n", syspath, stackdir);
/* did we find ourself? */
if (strcmp(udev_device_get_syspath(dev), syspath) == 0)
continue;
dev_db = udev_device_new_from_syspath(udev, syspath);
if (dev_db != NULL) {
const char *devnode;
devnode = udev_device_get_devnode(dev_db);
if (devnode != NULL) {
dbg(udev, "compare priority of '%s'(%i) > '%s'(%i)\n", target, priority,
udev_device_get_devnode(dev_db), udev_device_get_devlink_priority(dev_db));
if (target == NULL || udev_device_get_devlink_priority(dev_db) > priority) {
info(udev, "'%s' claims priority %i for '%s'\n",
syspath, udev_device_get_devlink_priority(dev_db), stackdir);
priority = udev_device_get_devlink_priority(dev_db);
util_strscpy(buf, bufsize, devnode);
target = buf;
}
}
udev_device_unref(dev_db);
}
}
closedir(dir);
return target;
}
