[PATCH] more advanced user query options

[elogind.git] / udevdb.c

diff --git a/udevdb.c b/udevdb.c
index 5be3c2515126efb327d2276bbaddfbdb98963597..8d077ea94fc766b652cdd0af705210867e23218f 100644 (file)
--- a/udevdb.c
+++ b/udevdb.c
@@ -62,29 +62,22 @@ int udevdb_add_dev(const char *path, const struct udevice *dev)
        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;
+               return -ENODEV;
 
        memcpy(dev, data.dptr, sizeof(*dev));
-exit:
-       free(data.dptr);
-       return dev;
+       return 0;
 }
 
 int udevdb_delete_dev(const char *path)
@@ -131,7 +124,43 @@ int udevdb_init(int init_flag)
                        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;
+}
+
+void (*user_record_callback) (char *path, struct udevice *dev);
+
+static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
+{
+       user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr);
+       return 0;
+}
+
+/**
+ * udevdb_dump: dumps whole database by passing record data to user function
+ * @user_record_handler: user function called for every record in the database
+ */
+int udevdb_dump(void (*user_record_handler) (char *path, struct udevice *dev))
+{
+       if (user_record_handler == NULL) {
+               dbg("invalid user record handling function");
                return -EINVAL;
        }
+       user_record_callback = user_record_handler;
+       tdb_traverse(udevdb, traverse_callback, NULL);
        return 0;
 }