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+/*
+ * lib/handlers.c default netlink message handlers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
+ */
+
+/**
+ * @ingroup core
+ * @defgroup cb Callbacks/Customization
+ *
+ * @details
+ * @par 1) Setting up a callback set
+ * @code
+ * // Allocate a callback set and initialize it to the verbose default set
+ * struct nl_cb *cb = nl_cb_alloc(NL_CB_VERBOSE);
+ *
+ * // Modify the set to call my_func() for all valid messages
+ * nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, my_func, NULL);
+ *
+ * // Set the error message handler to the verbose default implementation
+ * // and direct it to print all errors to the given file descriptor.
+ * FILE *file = fopen(...);
+ * nl_cb_err(cb, NL_CB_VERBOSE, NULL, file);
+ * @endcode
+ * @{
+ */
+
+#include <netlink-local.h>
+#include <netlink/netlink.h>
+#include <netlink/utils.h>
+#include <netlink/msg.h>
+#include <netlink/handlers.h>
+
+/**
+ * @name Callback Handle Management
+ * @{
+ */
+
+/**
+ * Allocate a new callback handle
+ * @arg kind callback kind to be used for initialization
+ * @return Newly allocated callback handle or NULL
+ */
+struct nl_cb *nl_cb_alloc(enum nl_cb_kind kind)
+{
+ int i;
+ struct nl_cb *cb;
+
+ if (kind < 0 || kind > NL_CB_KIND_MAX)
+ return NULL;
+
+ cb = calloc(1, sizeof(*cb));
+ if (!cb)
+ return NULL;
+
+ cb->cb_refcnt = 1;
+
+ for (i = 0; i <= NL_CB_TYPE_MAX; i++)
+ nl_cb_set(cb, i, kind, NULL, NULL);
+
+ nl_cb_err(cb, kind, NULL, NULL);
+
+ return cb;
+}
+
+/**
+ * Clone an existing callback handle
+ * @arg orig original callback handle
+ * @return Newly allocated callback handle being a duplicate of
+ * orig or NULL
+ */
+struct nl_cb *nl_cb_clone(struct nl_cb *orig)
+{
+ struct nl_cb *cb;
+
+ cb = nl_cb_alloc(NL_CB_DEFAULT);
+ if (!cb)
+ return NULL;
+
+ memcpy(cb, orig, sizeof(*orig));
+ cb->cb_refcnt = 1;
+
+ return cb;
+}
+
+void nl_cb_put(struct nl_cb *cb)
+{
+ if (!cb)
+ return;
+
+ cb->cb_refcnt--;
+
+ if (cb->cb_refcnt < 0)
+ BUG();
+
+ if (cb->cb_refcnt <= 0)
+ free(cb);
+}
+
+/** @} */
+
+/**
+ * @name Callback Setup
+ * @{
+ */
+
+/**
+ * Set up a callback
+ * @arg cb callback set
+ * @arg type callback to modify
+ * @arg kind kind of implementation
+ * @arg func callback function (NL_CB_CUSTOM)
+ * @arg arg argument passed to callback
+ *
+ * @return 0 on success or a negative error code
+ */
+int nl_cb_set(struct nl_cb *cb, enum nl_cb_type type, enum nl_cb_kind kind,
+ nl_recvmsg_msg_cb_t func, void *arg)
+{
+ if (type < 0 || type > NL_CB_TYPE_MAX)
+ return -NLE_RANGE;
+
+ if (kind < 0 || kind > NL_CB_KIND_MAX)
+ return -NLE_RANGE;
+
+ if (kind == NL_CB_CUSTOM) {
+ cb->cb_set[type] = func;
+ cb->cb_args[type] = arg;
+ }
+
+ return 0;
+}
+
+/**
+ * Set up an error callback
+ * @arg cb callback set
+ * @arg kind kind of callback
+ * @arg func callback function
+ * @arg arg argument to be passed to callback function
+ */
+int nl_cb_err(struct nl_cb *cb, enum nl_cb_kind kind,
+ nl_recvmsg_err_cb_t func, void *arg)
+{
+ if (kind < 0 || kind > NL_CB_KIND_MAX)
+ return -NLE_RANGE;
+
+ if (kind == NL_CB_CUSTOM) {
+ cb->cb_err = func;
+ cb->cb_err_arg = arg;
+ }
+
+ return 0;
+}
+
+/** @} */
+
+/** @} */