mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-15 19:16:08 +07:00
229 lines
4.8 KiB
C
229 lines
4.8 KiB
C
/*
|
|
* udev_db.c
|
|
*
|
|
* Userspace devfs
|
|
*
|
|
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2004 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 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 <stdio.h>
|
|
#include <string.h>
|
|
#include <stddef.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <dirent.h>
|
|
|
|
#include "libsysfs/sysfs/libsysfs.h"
|
|
#include "udev.h"
|
|
#include "udev_utils.h"
|
|
#include "logging.h"
|
|
#include "udev_db.h"
|
|
|
|
#define PATH_TO_NAME_CHAR '@'
|
|
|
|
static int get_db_filename(struct udevice *udev, char *filename, int len)
|
|
{
|
|
char devpath[SYSFS_PATH_MAX];
|
|
char *pos;
|
|
|
|
/* replace '/' to transform path into a filename */
|
|
strfieldcpy(devpath, udev->devpath);
|
|
pos = strchr(&devpath[1], '/');
|
|
while (pos) {
|
|
pos[0] = PATH_TO_NAME_CHAR;
|
|
pos = strchr(&pos[1], '/');
|
|
}
|
|
snprintf(filename, len, "%s%s", udev_db_path, devpath);
|
|
filename[len-1] = '\0';
|
|
|
|
return 0;
|
|
}
|
|
|
|
int udev_db_add_device(struct udevice *udev)
|
|
{
|
|
char filename[SYSFS_PATH_MAX];
|
|
FILE *f;
|
|
|
|
if (udev->test_run)
|
|
return 0;
|
|
|
|
get_db_filename(udev, filename, SYSFS_PATH_MAX);
|
|
|
|
create_path(filename);
|
|
|
|
f = fopen(filename, "w");
|
|
if (f == NULL) {
|
|
dbg("unable to create db file '%s'", filename);
|
|
return -1;
|
|
}
|
|
dbg("storing data for device '%s' in '%s'", udev->devpath, filename);
|
|
|
|
fprintf(f, "P:%s\n", udev->devpath);
|
|
fprintf(f, "N:%s\n", udev->name);
|
|
fprintf(f, "S:%s\n", udev->symlink);
|
|
fprintf(f, "A:%u\n", udev->partitions);
|
|
fprintf(f, "R:%u\n", udev->ignore_remove);
|
|
|
|
fclose(f);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_db_file(struct udevice *udev, const char *filename)
|
|
{
|
|
char line[NAME_SIZE];
|
|
char *bufline;
|
|
char *buf;
|
|
size_t bufsize;
|
|
size_t cur;
|
|
size_t count;
|
|
|
|
if (file_map(filename, &buf, &bufsize) != 0) {
|
|
dbg("unable to read db file '%s'", filename);
|
|
return -1;
|
|
}
|
|
|
|
cur = 0;
|
|
while (cur < bufsize) {
|
|
count = buf_get_line(buf, bufsize, cur);
|
|
bufline = &buf[cur];
|
|
cur += count+1;
|
|
|
|
switch(bufline[0]) {
|
|
case 'P':
|
|
if (count > DEVPATH_SIZE)
|
|
count = DEVPATH_SIZE-1;
|
|
strncpy(udev->devpath, &bufline[2], count-2);
|
|
udev->devpath[count-2] = '\0';
|
|
break;
|
|
case 'N':
|
|
if (count > NAME_SIZE)
|
|
count = NAME_SIZE-1;
|
|
strncpy(udev->name, &bufline[2], count-2);
|
|
udev->name[count-2] = '\0';
|
|
break;
|
|
case 'S':
|
|
if (count > NAME_SIZE)
|
|
count = NAME_SIZE-1;
|
|
strncpy(udev->symlink, &bufline[2], count-2);
|
|
udev->symlink[count-2] = '\0';
|
|
break;
|
|
case 'A':
|
|
if (count > NAME_SIZE)
|
|
count = NAME_SIZE-1;
|
|
strncpy(line, &bufline[2], count-2);
|
|
line[count-2] = '\0';
|
|
udev->partitions = atoi(line);
|
|
break;
|
|
case 'R':
|
|
if (count > NAME_SIZE)
|
|
count = NAME_SIZE-1;
|
|
strncpy(line, &bufline[2], count-2);
|
|
line[count-2] = '\0';
|
|
udev->ignore_remove = atoi(line);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (udev->name[0] == '\0')
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int udev_db_get_device(struct udevice *udev)
|
|
{
|
|
char filename[SYSFS_PATH_MAX];
|
|
|
|
get_db_filename(udev, filename, SYSFS_PATH_MAX);
|
|
|
|
return parse_db_file(udev, filename);
|
|
}
|
|
|
|
int udev_db_delete_device(struct udevice *udev)
|
|
{
|
|
char filename[SYSFS_PATH_MAX];
|
|
|
|
get_db_filename(udev, filename, SYSFS_PATH_MAX);
|
|
unlink(filename);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int udev_db_get_device_byname(struct udevice *udev, const char *name)
|
|
{
|
|
struct dirent *ent;
|
|
DIR *dir;
|
|
char filename[NAME_SIZE];
|
|
struct udevice db_udev;
|
|
|
|
dir = opendir(udev_db_path);
|
|
if (dir == NULL) {
|
|
dbg("unable to udev db '%s'", udev_db_path);
|
|
return -1;
|
|
}
|
|
|
|
while (1) {
|
|
ent = readdir(dir);
|
|
if (ent == NULL || ent->d_name[0] == '\0')
|
|
break;
|
|
|
|
if (ent->d_name[0] == '.')
|
|
continue;
|
|
|
|
snprintf(filename, NAME_SIZE, "%s/%s", udev_db_path, ent->d_name);
|
|
filename[NAME_SIZE-1] = '\0';
|
|
|
|
memset(&db_udev, 0x00, sizeof(struct udevice));
|
|
if (parse_db_file(&db_udev, filename) == 0) {
|
|
char *pos;
|
|
int len;
|
|
|
|
if (strncmp(name, db_udev.name, NAME_SIZE) == 0) {
|
|
goto found;
|
|
}
|
|
|
|
foreach_strpart(db_udev.symlink, " ", pos, len) {
|
|
if (strncmp(name, pos, len) != 0)
|
|
continue;
|
|
|
|
if (len == strlen(name))
|
|
goto found;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
closedir(dir);
|
|
|
|
return -1;
|
|
|
|
found:
|
|
closedir(dir);
|
|
|
|
strfieldcpy(udev->devpath, db_udev.devpath);
|
|
strfieldcpy(udev->name, db_udev.name);
|
|
strfieldcpy(udev->symlink, db_udev.symlink);
|
|
udev->partitions = db_udev.partitions;
|
|
|
|
return 0;
|
|
}
|