+#ifdef RTE_EXEC_ENV_LINUXAPP
+static int
+parse_sysfs_value(const char *filename, unsigned long *val)
+{
+ FILE *f;
+ char buf[BUFSIZ];
+ char *end = NULL;
+
+ if ((f = fopen(filename, "r")) == NULL) {
+ PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s\n",
+ __func__, filename);
+ return -1;
+ }
+
+ if (fgets(buf, sizeof(buf), f) == NULL) {
+ PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+ *val = strtoul(buf, &end, 0);
+ if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
+ PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+ fclose(f);
+ return 0;
+}
+
+static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
+{
+ unsigned int uio_num;
+ struct dirent *e;
+ DIR *dir;
+ char dirname[PATH_MAX];
+
+ /* depending on kernel version, uio can be located in uio/uioX
+ * or uio:uioX */
+ rte_snprintf(dirname, sizeof(dirname),
+ SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
+ loc->domain, loc->bus, loc->devid, loc->function);
+ dir = opendir(dirname);
+ if (dir == NULL) {
+ /* retry with the parent directory */
+ rte_snprintf(dirname, sizeof(dirname),
+ SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
+ loc->domain, loc->bus, loc->devid, loc->function);
+ dir = opendir(dirname);
+
+ if (dir == NULL) {
+ PMD_INIT_LOG(ERR, "Cannot opendir %s\n", dirname);
+ return -1;
+ }
+ }
+
+ /* take the first file starting with "uio" */
+ while ((e = readdir(dir)) != NULL) {
+ /* format could be uio%d ...*/
+ int shortprefix_len = sizeof("uio") - 1;
+ /* ... or uio:uio%d */
+ int longprefix_len = sizeof("uio:uio") - 1;
+ char *endptr;
+
+ if (strncmp(e->d_name, "uio", 3) != 0)
+ continue;
+
+ /* first try uio%d */
+ errno = 0;
+ uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
+ if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
+ rte_snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
+ break;
+ }
+
+ /* then try uio:uio%d */
+ errno = 0;
+ uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
+ if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
+ rte_snprintf(buf, buflen, "%s/uio:uio%u", dirname,
+ uio_num);
+ break;
+ }
+ }
+ closedir(dir);
+
+ /* No uio resource found */
+ if (e == NULL) {
+ PMD_INIT_LOG(ERR, "Could not find uio resource\n");
+ return -1;
+ }
+
+ return 0;
+}
+#endif
+