/* * udevdb.c - udev database library * * 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. * */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <stddef.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> #include <errno.h> #include <signal.h> #include "libsysfs/sysfs/libsysfs.h" #include "udev.h" #include "udev_lib.h" #include "udev_version.h" #include "logging.h" #include "namedev.h" #include "udevdb.h" #include "tdb/tdb.h" static TDB_CONTEXT *udevdb; sig_atomic_t gotalarm; int udevdb_add_dev(struct udevice *udev) { TDB_DATA key, data; char keystr[SYSFS_PATH_MAX]; if (udev->test_run) return 0; if (udevdb == NULL) return -1; memset(keystr, 0x00, SYSFS_PATH_MAX); strfieldcpy(keystr, udev->devpath); key.dptr = keystr; key.dsize = strlen(keystr) + 1; data.dptr = (void *) udev; data.dsize = UDEVICE_DB_LEN; dbg("store key '%s' for device '%s'", keystr, udev->name); return tdb_store(udevdb, key, data, TDB_REPLACE); } int udevdb_get_dev(const char *path, struct udevice *udev) { TDB_DATA key, data; if (udevdb == NULL) return -1; 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(udev, 0x00, sizeof(struct udevice)); memcpy(udev, data.dptr, UDEVICE_DB_LEN); return 0; } int udevdb_delete_dev(const char *path) { TDB_DATA key; char keystr[SYSFS_PATH_MAX]; if (udevdb == NULL) return -1; if (path == NULL) return -EINVAL; memset(keystr, 0, sizeof(keystr)); strfieldcpy(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; tdb_set_lock_alarm(&gotalarm); 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) (const 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) (const char *path, struct udevice *dev)) { int retval = 0; if (udevdb == NULL) return -1; 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(const char *path, struct udevice *udev) { char *pos; int len; if (strncmp(udev->name, find_name, sizeof(udev->name)) == 0) { memcpy(find_dev, udev, sizeof(struct udevice)); strfieldcpymax(find_path, path, NAME_SIZE); find_found = 1; /* stop search */ return 1; } /* look for matching symlink*/ foreach_strpart(udev->symlink, " ", pos, len) { if (strncmp(pos, find_name, len) != 0) continue; if (len != strlen(find_name)) continue; memcpy(find_dev, udev, sizeof(struct udevice)); strfieldcpymax(find_path, path, NAME_SIZE); find_found = 1; 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; }