tdb2: tdb_foreach()

Create an iterator over every open tdb (not internal TDBs).  This is
useful for re-establishing the tdb1-style active lock for
CLEAR_IF_FIRST.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(Imported from CCAN commit 1a0c636bc38213bd0322db47529f78f2dc22ffdd)

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/tdb2/open.c b/lib/tdb2/open.c
index 0f29d7a1fb..fc683d8c9b 100644
--- a/lib/tdb2/open.c
+++ b/lib/tdb2/open.c
@@ -689,3 +689,13 @@ int tdb_close(struct tdb_context *tdb)
 
 	return ret;
 }
+
+void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p)
+{
+	struct tdb_context *i;
+
+	for (i = tdbs; i; i = i->next) {
+		if (fn(i, p) != 0)
+			break;
+	}
+}