2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
32 #include "libudev-private.h"
35 ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
41 strlcpy(path, udev_get_sys_path(udev), sizeof(path));
42 strlcat(path, devpath, sizeof(path));
43 strlcat(path, "/subsystem", sizeof(path));
44 len = readlink(path, path, sizeof(path));
45 if (len < 0 || len >= (ssize_t) sizeof(path))
48 pos = strrchr(path, '/');
52 return strlcpy(subsystem, pos, size);