/*
- * udevdb.c
+ * udevdb.c - udev database library
*
* Userspace devfs
*
*
*/
-/*
- * udev database library
- */
+#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 "udev_version.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"
-#include "libsysfs/libsysfs.h"
static TDB_CONTEXT *udevdb;
return -ENODEV;
memset(keystr, 0, NAME_SIZE);
- strcpy(keystr, path);
+ strfieldcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
-
+
data.dptr = (void *)dev;
- data.dsize = sizeof(*dev);
-
+ data.dsize = UDEVICE_LEN;
+ dbg("store key '%s' for device '%s'", path, dev->name);
+
return tdb_store(udevdb, key, data, TDB_REPLACE);
}
-struct udevice *udevdb_get_dev(const char *path)
+int udevdb_get_dev(const char *path, struct udevice *dev)
{
TDB_DATA key, data;
- struct udevice *dev;
if (path == NULL)
- return 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 NULL;
-
- dev = malloc(sizeof(*dev));
- if (dev == NULL)
- goto exit;
-
- memcpy(dev, data.dptr, sizeof(*dev));
-exit:
- free(data.dptr);
- return dev;
+ return -ENODEV;
+
+ memset(dev, 0, sizeof(struct udevice));
+ memcpy(dev, data.dptr, UDEVICE_LEN);
+ return 0;
}
int udevdb_delete_dev(const char *path)
return -EINVAL;
memset(keystr, 0, sizeof(keystr));
- strcpy(keystr, path);
+ strfieldcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
-
+
return tdb_delete(udevdb, key);
}
/**
* udevdb_init: initializes database
- * @init_flag: database can either be in memory - UDEVDB_INTERNAL - or
- * written to a file with UDEVDB_DEFAULT.
+ * @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_CONFIG_DIR UDEV_DB, 0, init_flag, O_RDWR | O_CREAT, 0644);
+ 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");
+ dbg("unable to initialize in-memory database");
else
- dbg("Unable to initialize database at %s", UDEV_CONFIG_DIR UDEV_DB);
+ 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)
+{
+ char *pos;
+ int len;
+
+ if (strncmp(dev->name, find_name, sizeof(dev->name)) == 0) {
+ memcpy(find_dev, dev, sizeof(struct udevice));
+ strfieldcpymax(find_path, path, NAME_SIZE);
+ find_found = 1;
+ /* stop search */
+ return 1;
+ }
+ /* look for matching symlink*/
+ foreach_strpart(dev->symlink, " ", pos, len) {
+ if (strncmp(pos, find_name, len) != 0)
+ continue;
+
+ if (len != strlen(find_name))
+ continue;
+
+ memcpy(find_dev, dev, 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;
+}
~ianmdlvl / elogind.git / blobdiff