/*
- * udevdb.c - udev database library
+ * udevdb.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (C) 2003 IBM Corp.
+ * 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
*
*/
-#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
+
#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 <dirent.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;
+#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-1, "%s%s", udev_db_path, devpath);
+ filename[len-1] = '\0';
+
+ return 0;
+}
int udevdb_add_dev(struct udevice *udev)
{
- TDB_DATA key, data;
- char keystr[SYSFS_PATH_MAX];
+ char filename[SYSFS_PATH_MAX];
+ FILE *f;
if (udev->test_run)
return 0;
- if (udevdb == NULL)
+ 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);
- memset(keystr, 0x00, SYSFS_PATH_MAX);
- strfieldcpy(keystr, udev->devpath);
- key.dptr = keystr;
- key.dsize = strlen(keystr) + 1;
+ fprintf(f, "P:%s\n", udev->devpath);
+ fprintf(f, "N:%s\n", udev->name);
+ fprintf(f, "S:%s\n", udev->symlink);
+ fprintf(f, "A:%d\n", udev->partitions);
- data.dptr = (void *) udev;
- data.dsize = UDEVICE_DB_LEN;
- dbg("store key '%s' for device '%s'", keystr, udev->name);
+ fclose(f);
- return tdb_store(udevdb, key, data, TDB_REPLACE);
+ return 0;
}
-int udevdb_get_dev(const char *path, struct udevice *udev)
+static int parse_db_file(struct udevice *udev, const char *filename)
{
- TDB_DATA key, data;
-
- if (udevdb == NULL)
+ 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;
+ }
- 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;
+ 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);
+ break;
+ case 'N':
+ if (count > NAME_SIZE)
+ count = NAME_SIZE-1;
+ strncpy(udev->name, &bufline[2], count-2);
+ break;
+ case 'S':
+ if (count > NAME_SIZE)
+ count = NAME_SIZE-1;
+ strncpy(udev->symlink, &bufline[2], count-2);
+ break;
+ case 'A':
+ strfieldcpy(line, &bufline[2]);
+ udev->partitions = atoi(line);
+ break;
+ }
+ }
- memset(udev, 0x00, sizeof(struct udevice));
- memcpy(udev, data.dptr, UDEVICE_DB_LEN);
+ if (udev->name[0] == '\0')
+ return -1;
return 0;
}
-int udevdb_delete_dev(const char *path)
+int udevdb_get_dev(struct udevice *udev)
{
- TDB_DATA key;
- char keystr[SYSFS_PATH_MAX];
-
- if (udevdb == NULL)
- return -1;
-
- if (path == NULL)
- return -EINVAL;
+ char filename[SYSFS_PATH_MAX];
- memset(keystr, 0, sizeof(keystr));
- strfieldcpy(keystr, path);
+ get_db_filename(udev, filename, SYSFS_PATH_MAX);
- key.dptr = keystr;
- key.dsize = strlen(keystr) + 1;
-
- return tdb_delete(udevdb, key);
+ return parse_db_file(udev, filename);
}
-/**
- * udevdb_exit: closes database
- */
-void udevdb_exit(void)
+int udevdb_delete_dev(struct udevice *udev)
{
- if (udevdb != NULL) {
- tdb_close(udevdb);
- udevdb = NULL;
- }
-}
+ char filename[SYSFS_PATH_MAX];
+
+ get_db_filename(udev, filename, SYSFS_PATH_MAX);
+ unlink(filename);
-/**
- * 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)
+int udevdb_get_dev_byname(struct udevice *udev, const char *name)
{
- 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;
+ 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;
}
- return 0;
-}
-static int (*user_record_callback) (const char *path, struct udevice *dev);
+ while (1) {
+ ent = readdir(dir);
+ if (ent == NULL || ent->d_name[0] == '\0')
+ break;
-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);
-}
+ if (ent->d_name[0] == '.')
+ continue;
-/**
- * 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;
+ snprintf(filename, NAME_SIZE-1, "%s/%s", udev_db_path, ent->d_name);
+ filename[NAME_SIZE-1] = '\0';
- if (udevdb == NULL)
- return -1;
+ memset(&db_udev, 0x00, sizeof(struct udevice));
+ if (parse_db_file(&db_udev, filename) == 0) {
+ char *pos;
+ int len;
- 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;
-}
+ if (strncmp(name, db_udev.name, NAME_SIZE) == 0) {
+ goto found;
+ }
-static struct udevice *find_dev;
-static char *find_path;
-static const char *find_name;
-static int find_found;
+ foreach_strpart(db_udev.symlink, " ", pos, len) {
+ if (strncmp(name, pos, len) != 0)
+ continue;
-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;
+ if (len == strlen(name))
+ goto found;
+ }
+
+ }
}
- /* look for matching symlink*/
- foreach_strpart(udev->symlink, " ", pos, len) {
- if (strncmp(pos, find_name, len) != 0)
- continue;
- if (len != strlen(find_name))
- continue;
+ closedir(dir);
- memcpy(find_dev, udev, sizeof(struct udevice));
- strfieldcpymax(find_path, path, NAME_SIZE);
- find_found = 1;
- return 1;
- }
- return 0;
-}
+ return -1;
-/**
- * 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;
+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;
}
~ianmdlvl / elogind.git / blobdiff