mirror of
https://github.com/systemd/systemd
synced 2024-09-06 16:56:43 +00:00
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
|
|
* sysfs_driver.c
|
|
*
|
|
* Driver utility functions for libsysfs
|
|
*
|
|
* Copyright (C) 2003 International Business Machines, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
#include "libsysfs.h"
|
|
#include "sysfs.h"
|
|
|
|
/**
|
|
* sysfs_close_driver: closes and cleans up driver structure
|
|
* @driver: driver to close
|
|
*/
|
|
void sysfs_close_driver(struct sysfs_driver *driver)
|
|
{
|
|
if (driver != NULL) {
|
|
if (driver->directory != NULL)
|
|
sysfs_close_directory(driver->directory);
|
|
free(driver);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* alloc_driver: allocates and initializes driver
|
|
* returns struct sysfs_driver with success and NULL with error.
|
|
*/
|
|
static struct sysfs_driver *alloc_driver(void)
|
|
{
|
|
return (struct sysfs_driver *)calloc(1, sizeof(struct sysfs_driver));
|
|
}
|
|
|
|
/**
|
|
* sysfs_open_driver: opens and initializes driver structure
|
|
* @path: path to driver directory
|
|
* returns struct sysfs_driver with success and NULL with error
|
|
*/
|
|
struct sysfs_driver *sysfs_open_driver(const char *path)
|
|
{
|
|
struct sysfs_driver *driver = NULL;
|
|
struct sysfs_directory *sdir = NULL;
|
|
char devname[SYSFS_NAME_LEN];
|
|
|
|
if (path == NULL) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
sdir = sysfs_open_directory(path);
|
|
if (sdir == NULL) {
|
|
dprintf (stderr, "Error opening directory %s\n", path);
|
|
return NULL;
|
|
}
|
|
if ((sysfs_read_directory(sdir)) != 0) {
|
|
dprintf (stderr, "Error reading directory %s\n", path);
|
|
sysfs_close_directory(sdir);
|
|
return NULL;
|
|
}
|
|
driver = alloc_driver();
|
|
if (driver == NULL) {
|
|
dprintf(stderr, "Error allocating driver at %s\n", path);
|
|
sysfs_close_directory(sdir);
|
|
return NULL;
|
|
}
|
|
if ((sysfs_get_name_from_path(path, devname, SYSFS_NAME_LEN)) != 0) {
|
|
dprintf (stderr, "Error reading directory %s\n", path);
|
|
sysfs_close_directory(sdir);
|
|
free(driver);
|
|
return NULL;
|
|
}
|
|
strncpy(driver->name, devname, sizeof(driver->name));
|
|
driver->directory = sdir;
|
|
|
|
return driver;
|
|
}
|