+static int syspath_add(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+ char *path;
+ struct syspath *entry;
+
+ /* double array size if needed */
+ if (udev_enumerate->devices_cur >= udev_enumerate->devices_max) {
+ struct syspath *buf;
+ unsigned int add;
+
+ add = udev_enumerate->devices_max;
+ if (add < 1024)
+ add = 1024;
+ buf = realloc(udev_enumerate->devices, (udev_enumerate->devices_max + add) * sizeof(struct syspath));
+ if (buf == NULL)
+ return -ENOMEM;
+ udev_enumerate->devices = buf;
+ udev_enumerate->devices_max += add;
+ }
+
+ path = strdup(syspath);
+ if (path == NULL)
+ return -ENOMEM;
+ entry = &udev_enumerate->devices[udev_enumerate->devices_cur];
+ entry->syspath = path;
+ entry->len = strlen(path);
+ udev_enumerate->devices_cur++;
+ udev_enumerate->devices_uptodate = false;
+ return 0;
+}
+
+static int syspath_cmp(const void *p1, const void *p2)
+{
+ const struct syspath *path1 = p1;
+ const struct syspath *path2 = p2;
+ size_t len;
+ int ret;
+
+ len = MIN(path1->len, path2->len);
+ ret = memcmp(path1->syspath, path2->syspath, len);
+ if (ret == 0) {
+ if (path1->len < path2->len)
+ ret = -1;
+ else if (path1->len > path2->len)
+ ret = 1;
+ }
+ return ret;
+}
+
+/* For devices that should be moved to the absolute end of the list */
+static int devices_delay_end(struct udev *udev, const char *syspath)
+{
+ static const char *delay_device_list[] = {
+ "/block/md",
+ "/block/dm-",
+ NULL
+ };
+ size_t len;
+ int i;
+
+ len = strlen(udev_get_sys_path(udev));
+ for (i = 0; delay_device_list[i] != NULL; i++) {
+ if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
+ dbg(udev, "delaying: %s\n", syspath);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* For devices that should just be moved a little bit later, just
+ * before the point where some common path prefix changes. Returns the
+ * number of characters that make up that common prefix */
+static size_t devices_delay_later(struct udev *udev, const char *syspath)
+{
+ const char *c;
+
+ /* For sound cards the control device must be enumerated last
+ * to make sure it's the final device node that gets ACLs
+ * applied. Applications rely on this fact and use ACL changes
+ * on the control node as an indicator that the ACL change of
+ * the entire sound card completed. The kernel makes this
+ * guarantee when creating those devices, and hence we should
+ * too when enumerating them. */
+
+ if ((c = strstr(syspath, "/sound/card"))) {
+ c += 11;
+ c += strcspn(c, "/");
+
+ if (strncmp(c, "/controlC", 9) == 0)
+ return c - syspath + 1;
+ }
+
+ return 0;
+}
+
+/**
+ * udev_enumerate_get_list_entry:
+ * @udev_enumerate: context
+ *
+ * Returns: the first entry of the sorted list of device paths.
+ */
~ianmdlvl / elogind.git / blobdiff