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mirror of https://github.com/systemd/systemd-stable.git synced 2024-10-30 23:21:08 +03:00
systemd-stable/udevdb.c
kay.sievers@vrfy.org 00866ed2a1 [PATCH] udev - keep private data out of the database?
Shouldn't we keep the temporary strings out of the database,
or is this information useful for something?

It cuts the length of the data from 628 to 275 bytes.
2005-04-26 21:32:27 -07:00

206 lines
4.6 KiB
C

/*
* udevdb.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2003 IBM Corp.
*
* 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.
*
*/
/*
* udev database library
*/
#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include "udev_version.h"
#include "udev.h"
#include "logging.h"
#include "namedev.h"
#include "udevdb.h"
#include "tdb/tdb.h"
#include "libsysfs/libsysfs.h"
static TDB_CONTEXT *udevdb;
int udevdb_add_dev(const char *path, const struct udevice *dev)
{
TDB_DATA key, data;
char keystr[SYSFS_PATH_MAX];
if ((path == NULL) || (dev == NULL))
return -ENODEV;
memset(keystr, 0, NAME_SIZE);
strcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
data.dptr = (void *)dev;
data.dsize = UDEVICE_LEN;
return tdb_store(udevdb, key, data, TDB_REPLACE);
}
int udevdb_get_dev(const char *path, struct udevice *dev)
{
TDB_DATA key, data;
if (path == NULL)
return -ENODEV;
key.dptr = (void *)path;
key.dsize = strlen(path) + 1;
data = tdb_fetch(udevdb, key);
if (data.dptr == NULL || data.dsize == 0)
return -ENODEV;
memset(dev, 0, sizeof(struct udevice));
memcpy(dev, data.dptr, UDEVICE_LEN);
return 0;
}
int udevdb_delete_dev(const char *path)
{
TDB_DATA key;
char keystr[SYSFS_PATH_MAX];
if (path == NULL)
return -EINVAL;
memset(keystr, 0, sizeof(keystr));
strcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
return tdb_delete(udevdb, key);
}
/**
* udevdb_exit: closes database
*/
void udevdb_exit(void)
{
if (udevdb != NULL) {
tdb_close(udevdb);
udevdb = NULL;
}
}
/**
* udevdb_init: initializes database
* @init_flag: UDEVDB_INTERNAL - database stays in memory
* UDEVDB_DEFAULT - database is written to a file
*/
int udevdb_init(int init_flag)
{
if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL)
return -EINVAL;
udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644);
if (udevdb == NULL) {
if (init_flag == UDEVDB_INTERNAL)
dbg("unable to initialize in-memory database");
else
dbg("unable to initialize database at '%s'", udev_db_filename);
return -EACCES;
}
return 0;
}
/**
* udevdb_open_ro: open database for reading
*/
int udevdb_open_ro(void)
{
udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0);
if (udevdb == NULL) {
dbg("unable to open database at '%s'", udev_db_filename);
return -EACCES;
}
return 0;
}
static int (*user_record_callback) (char *path, struct udevice *dev);
static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
{
return user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr);
}
/**
* udevdb_call_foreach: dumps whole database by passing record data to user function
* @user_record_handler: user function called for every record in the database
*/
int udevdb_call_foreach(int (*user_record_handler) (char *path, struct udevice *dev))
{
int retval = 0;
if (user_record_handler == NULL) {
dbg("invalid user record handling function");
return -EINVAL;
}
user_record_callback = user_record_handler;
retval = tdb_traverse(udevdb, traverse_callback, NULL);
if (retval < 0)
return -ENODEV;
else
return 0;
}
static struct udevice *find_dev;
static char *find_path;
static const char *find_name;
static int find_found;
static int find_device_by_name(char *path, struct udevice *dev)
{
if (strncmp(dev->name, find_name, sizeof(dev->name)) == 0) {
memcpy(find_dev, dev, sizeof(*find_dev));
strncpy(find_path, path, NAME_SIZE);
find_found = 1;
/* stop search */
return 1;
}
return 0;
}
/**
* udevdb_get_dev_byname: search device with given name by traversing the whole database
*/
int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev)
{
find_found = 0;
find_path = path;
find_dev = dev;
find_name = name;
udevdb_call_foreach(find_device_by_name);
if (find_found == 1)
return 0;
else
return -1;
}