mirror of
https://github.com/systemd/systemd
synced 2024-09-06 16:56:43 +00:00
201 lines
4.5 KiB
C
201 lines
4.5 KiB
C
![]() |
/*
|
||
|
* udev-add.c
|
||
|
*
|
||
|
* Userspace devfs
|
||
|
*
|
||
|
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
|
||
|
*
|
||
|
*
|
||
|
* 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 version 2 of the License.
|
||
|
*
|
||
|
* 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, write to the Free Software Foundation, Inc.,
|
||
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#include <stdio.h>
|
||
|
#include <fcntl.h>
|
||
|
#include <unistd.h>
|
||
|
#include <errno.h>
|
||
|
|
||
|
#include "udev.h"
|
||
|
#include "udev_version.h"
|
||
|
#include "namedev.h"
|
||
|
#include "libsysfs/libsysfs.h"
|
||
|
|
||
|
|
||
|
static char sysfs_path[SYSFS_PATH_MAX];
|
||
|
|
||
|
/*
|
||
|
* Right now the major/minor of a device is stored in a file called
|
||
|
* "dev" in sysfs.
|
||
|
* The number is stored as:
|
||
|
* MMmm
|
||
|
* MM is the major
|
||
|
* mm is the minor
|
||
|
* The value is in hex.
|
||
|
* Yes, this will probably change when we go to a bigger major/minor
|
||
|
* range, and will have to be changed at that time.
|
||
|
*/
|
||
|
static int get_major_minor(struct sysfs_class_device *class_dev, int *major, int *minor)
|
||
|
{
|
||
|
char temp[3];
|
||
|
int retval = 0;
|
||
|
|
||
|
char *dev;
|
||
|
|
||
|
dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
|
||
|
if (dev == NULL)
|
||
|
return -ENODEV;
|
||
|
|
||
|
dbg("dev = %s", dev);
|
||
|
|
||
|
temp[0] = dev[0];
|
||
|
temp[1] = dev[1];
|
||
|
temp[2] = 0x00;
|
||
|
*major = (int)strtol(&temp[0], NULL, 16);
|
||
|
|
||
|
temp[0] = dev[2];
|
||
|
temp[1] = dev[3];
|
||
|
temp[2] = 0x00;
|
||
|
*minor = (int)strtol(&temp[0], NULL, 16);
|
||
|
|
||
|
dbg("found major = %d, minor = %d", *major, *minor);
|
||
|
|
||
|
retval = 0;
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We also want to add some permissions here, and possibly some symlinks
|
||
|
*/
|
||
|
static int create_node(char *name, char type, int major, int minor, int mode)
|
||
|
{
|
||
|
char *argv[7];
|
||
|
char mode_string[100];
|
||
|
char type_string[3];
|
||
|
char major_string[20];
|
||
|
char minor_string[20];
|
||
|
char filename[255];
|
||
|
int retval = 0;
|
||
|
|
||
|
strncpy(filename, UDEV_ROOT, sizeof(filename));
|
||
|
strncat(filename, name, sizeof(filename));
|
||
|
|
||
|
snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
|
||
|
snprintf(type_string, sizeof(type_string), "%c", type);
|
||
|
snprintf(major_string, sizeof(major_string), "%d", major);
|
||
|
snprintf(minor_string, sizeof(minor_string), "%d", minor);
|
||
|
|
||
|
argv[0] = MKNOD;
|
||
|
argv[1] = mode_string;
|
||
|
argv[2] = filename;
|
||
|
argv[3] = type_string;
|
||
|
argv[4] = major_string;
|
||
|
argv[5] = minor_string;
|
||
|
argv[6] = NULL;
|
||
|
dbg ("executing %s %s %s %s %s %s",
|
||
|
argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
|
||
|
switch (fork()) {
|
||
|
case 0:
|
||
|
/* we are the child, so lets run the program */
|
||
|
execv (MKNOD, argv);
|
||
|
exit(0);
|
||
|
break;
|
||
|
case (-1):
|
||
|
dbg ("fork failed.");
|
||
|
retval = -EFAULT;
|
||
|
break;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
struct sysfs_class_device *get_class_dev(char *device_name)
|
||
|
{
|
||
|
char dev_path[SYSFS_PATH_MAX];
|
||
|
struct sysfs_class_device *class_dev;
|
||
|
|
||
|
strcpy(dev_path, sysfs_path);
|
||
|
strcat(dev_path, device_name);
|
||
|
|
||
|
dbg("looking at %s", dev_path);
|
||
|
|
||
|
/* open up the sysfs class device for this thing... */
|
||
|
class_dev = sysfs_open_class_device(dev_path);
|
||
|
if (class_dev == NULL) {
|
||
|
dbg ("sysfs_open_class_device failed");
|
||
|
return NULL;
|
||
|
}
|
||
|
dbg("class_dev->name = %s", class_dev->name);
|
||
|
|
||
|
return class_dev;
|
||
|
}
|
||
|
|
||
|
static int udev_init(void)
|
||
|
{
|
||
|
int retval;
|
||
|
|
||
|
retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
|
||
|
dbg("sysfs_path = %s", sysfs_path);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
int udev_add_device(char *device, char *subsystem)
|
||
|
{
|
||
|
struct sysfs_class_device *class_dev;
|
||
|
struct device_attr attr;
|
||
|
//char *name;
|
||
|
int major;
|
||
|
int minor;
|
||
|
char type;
|
||
|
//int mode;
|
||
|
int retval = -EINVAL;
|
||
|
|
||
|
/* sleep for a second or two to give the kernel a chance to
|
||
|
* create the dev file
|
||
|
*/
|
||
|
sleep(1);
|
||
|
|
||
|
udev_init();
|
||
|
|
||
|
/* for now, the block layer is the only place where block devices are */
|
||
|
if (strcmp(subsystem, "block") == 0)
|
||
|
type = 'b';
|
||
|
else
|
||
|
type = 'c';
|
||
|
|
||
|
class_dev = get_class_dev(device);
|
||
|
if (class_dev == NULL)
|
||
|
goto exit;
|
||
|
|
||
|
retval = namedev_name_device(class_dev, &attr);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
retval = get_major_minor(class_dev, &major, &minor);
|
||
|
if (retval) {
|
||
|
dbg ("get_major_minor failed");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
sysfs_close_class_device(class_dev);
|
||
|
|
||
|
return create_node(attr.name, type, major, minor, attr.mode);
|
||
|
|
||
|
exit:
|
||
|
return retval;
|
||
|
}
|
||
|
|