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