mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-11-01 09:21:11 +03:00
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
|
/*
|
||
|
|
* libudev - interface to udev device information
|
||
|
|
*
|
||
|
|
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
|
||
|
|
*
|
||
|
|
* This program is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation, either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <dirent.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
|
||
|
|
#include "libudev.h"
|
||
|
|
#include "libudev-private.h"
|
||
|
|
#include "../udev.h"
|
||
|
|
|
||
|
|
ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
|
||
|
|
{
|
||
|
|
char path[PATH_SIZE];
|
||
|
|
ssize_t len;
|
||
|
|
const char *pos;
|
||
|
|
|
||
|
|
strlcpy(path, udev_get_sys_path(udev), sizeof(path));
|
||
|
|
strlcat(path, devpath, sizeof(path));
|
||
|
|
strlcat(path, "/subsystem", sizeof(path));
|
||
|
|
len = readlink(path, path, sizeof(path));
|
||
|
|
if (len < 0 || len >= (ssize_t) sizeof(path))
|
||
|
|
return -1;
|
||
|
|
path[len] = '\0';
|
||
|
|
pos = strrchr(path, '/');
|
||
|
|
if (pos == NULL)
|
||
|
|
return -1;
|
||
|
|
pos = &pos[1];
|
||
|
|
return strlcpy(subsystem, pos, size);
|
||
|
|
}
|