+ const char *directory = default_runtime_dir;
+ const char *xdg_runtime_dir = getenv("XDG_RUNTIME_DIR");
+ const char *fallback = "/tmp";
+ char tmp[PATH_MAX];
+ int ret;
+
+ if (getuid() != 0) {
+ /* try XDG path first, fall back to /tmp */
+ if (xdg_runtime_dir != NULL)
+ directory = xdg_runtime_dir;
+ else
+ directory = fallback;
+ }
+ /* create DPDK subdirectory under runtime dir */
+ ret = snprintf(tmp, sizeof(tmp), "%s/dpdk", directory);
+ if (ret < 0 || ret == sizeof(tmp)) {
+ RTE_LOG(ERR, EAL, "Error creating DPDK runtime path name\n");
+ return -1;
+ }
+
+ /* create prefix-specific subdirectory under DPDK runtime dir */
+ ret = snprintf(runtime_dir, sizeof(runtime_dir), "%s/%s",
+ tmp, internal_config.hugefile_prefix);
+ if (ret < 0 || ret == sizeof(runtime_dir)) {
+ RTE_LOG(ERR, EAL, "Error creating prefix-specific runtime path name\n");
+ return -1;
+ }
+
+ /* create the path if it doesn't exist. no "mkdir -p" here, so do it
+ * step by step.
+ */
+ ret = mkdir(tmp, 0700);
+ if (ret < 0 && errno != EEXIST) {
+ RTE_LOG(ERR, EAL, "Error creating '%s': %s\n",
+ tmp, strerror(errno));
+ return -1;
+ }
+
+ ret = mkdir(runtime_dir, 0700);
+ if (ret < 0 && errno != EEXIST) {
+ RTE_LOG(ERR, EAL, "Error creating '%s': %s\n",
+ runtime_dir, strerror(errno));
+ return -1;
+ }
+
+ return 0;