X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftdb2.h;h=d5ae329a6029d7659886992dd380e845bd9d2fb4;hp=5643ef4f8a1e2aeae9736dc8a18fbe29380b7ca8;hb=5d6194b434f3664d1025df12ef06c6a25f693bc8;hpb=6e3d9e8a66bf8b45150500f176452ee8e9ee9927

diff --git a/ccan/tdb2/tdb2.h b/ccan/tdb2/tdb2.h
index 5643ef4f..d5ae329a 100644
--- a/ccan/tdb2/tdb2.h
+++ b/ccan/tdb2/tdb2.h
@@ -85,6 +85,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 #define TDB_NOSYNC   64 /* don't use synchronous transactions */
 #define TDB_SEQNUM   128 /* maintain a sequence number */
 #define TDB_ALLOW_NESTING   256 /* fake nested transactions */
+#define TDB_RDONLY   512 /* implied by O_RDONLY */
 
 /**
  * tdb_close - close and free a tdb.
@@ -616,8 +617,6 @@ enum tdb_attribute_type {
  * This gets an attribute from a TDB which has previously been set (or
  * may return the default values).  Set @attr.base.attr to the
  * attribute type you want get.
- *
- * Currently this does not work for TDB_ATTRIBUTE_OPENHOOK.
  */
 enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
 				 union tdb_attribute *attr);
@@ -671,6 +670,20 @@ const char *tdb_name(const struct tdb_context *tdb);
  */
 int tdb_fd(const struct tdb_context *tdb);
 
+/**
+ * tdb_foreach - iterate through every open TDB.
+ * @fn: the function to call for every TDB
+ * @p: the pointer to hand to @fn
+ *
+ * TDB internally keeps track of all open TDBs; this function allows you to
+ * iterate through them.  If @fn returns non-zero, traversal stops.
+ */
+#define tdb_foreach(fn, p)						\
+	tdb_foreach_(typesafe_cb_preargs(int, void *, (fn), (p),	\
+					 struct tdb_context *), (p))
+
+void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p);
+
 /**
  * struct tdb_attribute_base - common fields for all tdb attributes.
  */