X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftdb2.h;h=50903a7641bfcc409c2c26d7d74a0a1c40210d60;hp=684bc0492a7260d9f284f8e5d59b3c3c0a097cf3;hb=a97da100b00206544c7a68593b64a49f2b854f7e;hpb=a0e0927e1f34d80fd4d4ee2d68fa2acb94ae9eb2

diff --git a/ccan/tdb2/tdb2.h b/ccan/tdb2/tdb2.h
index 684bc049..50903a76 100644
--- a/ccan/tdb2/tdb2.h
+++ b/ccan/tdb2/tdb2.h
@@ -38,6 +38,8 @@ extern "C" {
 #include <signal.h>
 /* For uint64_t */
 #include <stdint.h>
+/* For bool */
+#include <stdbool.h>
 #endif
 #include <ccan/compiler/compiler.h>
 #include <ccan/typesafe_cb/typesafe_cb.h>
@@ -197,6 +199,15 @@ enum TDB_ERROR tdb_append(struct tdb_context *tdb,
  */
 enum TDB_ERROR tdb_delete(struct tdb_context *tdb, struct tdb_data key);
 
+/**
+ * tdb_exists - does a key exist in the database?
+ * @tdb: the tdb context returned from tdb_open()
+ * @key: the key to search for.
+ *
+ * Returns true if it exists, or false if it doesn't or any other error.
+ */
+bool tdb_exists(struct tdb_context *tdb, TDB_DATA key);
+
 /**
  * tdb_transaction_start - start a transaction
  * @tdb: the tdb context returned from tdb_open()
@@ -276,6 +287,30 @@ int64_t tdb_traverse_(struct tdb_context *tdb,
 		      int (*fn)(struct tdb_context *,
 				TDB_DATA, TDB_DATA, void *), void *p);
 
+/**
+ * tdb_parse_record - operate directly on data in the database.
+ * @tdb: the tdb context returned from tdb_open()
+ * @key: the key whose record we should hand to @parse
+ * @parse: the function to call for the data
+ * @p: the private pointer to hand to @parse (types must match).
+ *
+ * This avoids a copy for many cases, by handing you a pointer into
+ * the memory-mapped database.  It also locks the record to prevent
+ * other accesses at the same time.
+ *
+ * Do not alter the data handed to parse()!
+ */
+#define tdb_parse_record(tdb, key, parse, p)				\
+	tdb_parse_record_((tdb), (key),					\
+			  typesafe_cb_preargs(enum TDB_ERROR, (parse), (p), \
+					      TDB_DATA, TDB_DATA), (p))
+
+enum TDB_ERROR tdb_parse_record_(struct tdb_context *tdb,
+				 TDB_DATA key,
+				 enum TDB_ERROR (*parse)(TDB_DATA key,
+							 TDB_DATA data,
+							 void *p),
+				 void *p);
 /**
  * tdb_firstkey - get the "first" key in a TDB
  * @tdb: the tdb context returned from tdb_open()
@@ -328,6 +363,15 @@ enum TDB_ERROR tdb_chainlock(struct tdb_context *tdb, TDB_DATA key);
  */
 enum TDB_ERROR tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key);
 
+/**
+ * tdb_wipe_all - wipe the database clean
+ * @tdb: the tdb context returned from tdb_open()
+ *
+ * Completely erase the database.  This is faster than iterating through
+ * each key and doing tdb_delete.
+ */
+enum TDB_ERROR tdb_wipe_all(struct tdb_context *tdb);
+
 /**
  * tdb_check - check a TDB for consistency
  * @tdb: the tdb context returned from tdb_open()
@@ -379,6 +423,37 @@ enum TDB_ERROR tdb_summary(struct tdb_context *tdb,
 			   enum tdb_summary_flags flags,
 			   char **summary);
 
+ 
+/**
+ * tdb_get_flags - return the flags for a tdb
+ * @tdb: the tdb context returned from tdb_open()
+ *
+ * This returns the flags on the current tdb.  Some of these are caused by
+ * the flags argument to tdb_open(), others (such as TDB_CONVERT) are
+ * intuited.
+ */
+unsigned int tdb_get_flags(struct tdb_context *tdb);
+
+/**
+ * tdb_add_flag - set a flag for a tdb
+ * @tdb: the tdb context returned from tdb_open()
+ * @flag: one of TDB_NOLOCK, TDB_NOMMAP or TDB_NOSYNC.
+ *
+ * You can use this to set a flag on the TDB.  You cannot set these flags
+ * on a TDB_INTERNAL tdb.
+ */
+void tdb_add_flag(struct tdb_context *tdb, unsigned flag);
+
+/**
+ * tdb_remove_flag - unset a flag for a tdb
+ * @tdb: the tdb context returned from tdb_open()
+ * @flag: one of TDB_NOLOCK, TDB_NOMMAP or TDB_NOSYNC.
+ *
+ * You can use this to clear a flag on the TDB.  You cannot clear flags
+ * on a TDB_INTERNAL tdb.
+ */
+void tdb_remove_flag(struct tdb_context *tdb, unsigned flag);
+
 /**
  * enum tdb_attribute_type - descriminator for union tdb_attribute.
  */