自学教程：C++ tipc_cfg_reply_error_string函数代码示例

static struct sk_buff *tipc_show_stats(void){	struct sk_buff *buf;	struct tlv_desc *rep_tlv;	struct print_buf pb;	int str_len;	u32 value;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));	if (value != 0)		return tipc_cfg_reply_error_string("unsupported argument");	buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));	if (buf == NULL)		return NULL;	rep_tlv = (struct tlv_desc *)buf->data;	tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);	tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "/n");	/* Use additional tipc_printf()'s to return more info ... */	str_len = tipc_printbuf_validate(&pb);	skb_put(buf, TLV_SPACE(str_len));	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);	return buf;}

static struct sk_buff *cfg_set_own_addr(void){	u32 addr;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));	if (addr == tipc_own_addr)		return tipc_cfg_reply_none();	if (!tipc_addr_node_valid(addr))		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE						   " (node address)");	if (tipc_mode == TIPC_NET_MODE)		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED						   " (cannot change node address once assigned)");	tipc_own_addr = addr;	/*	 * Must release all spinlocks before calling start_net() because	 * Linux version of TIPC calls eth_media_start() which calls	 * register_netdevice_notifier() which may block!	 *	 * Temporarily releasing the lock should be harmless for non-Linux TIPC,	 * but Linux version of eth_media_start() should really be reworked	 * so that it can be called with spinlocks held.	 */	spin_unlock_bh(&config_lock);	tipc_core_start_net();	spin_lock_bh(&config_lock);	return tipc_cfg_reply_none();}

static struct sk_buff *tipc_show_stats(void){	struct sk_buff *buf;	struct tlv_desc *rep_tlv;	char *pb;	int pb_len;	int str_len;	u32 value;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));	if (value != 0)		return tipc_cfg_reply_error_string("unsupported argument");	buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));	if (buf == NULL)		return NULL;	rep_tlv = (struct tlv_desc *)buf->data;	pb = TLV_DATA(rep_tlv);	pb_len = ULTRA_STRING_MAX_LEN;	str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "/n");	str_len += 1;	/* for "/0" */	skb_put(buf, TLV_SPACE(str_len));	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);	return buf;}

struct sk_buff *tipc_log_resize(const void *req_tlv_area, int req_tlv_space){	u32 value;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));	if (value != delimit(value, 0, 32768))		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE						   " (log size must be 0-32768)");	tipc_log_reinit(value);	return tipc_cfg_reply_none();}

struct sk_buff *tipc_log_resize_cmd(const void *req_tlv_area, int req_tlv_space){	u32 value;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));	if (value > 32768)		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE						   " (log size must be 0-32768)");	if (tipc_log_resize(value))		return tipc_cfg_reply_error_string(			"unable to create specified log (log size is now 0)");	return tipc_cfg_reply_none();}

static struct sk_buff *cfg_set_own_addr(void){	u32 addr;	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);	addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));	if (addr == tipc_own_addr)		return tipc_cfg_reply_none();	if (!tipc_addr_node_valid(addr))		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE						   " (node address)");	if (tipc_own_addr)		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED						   " (cannot change node address once assigned)");	tipc_net_start(addr);	return tipc_cfg_reply_none();}

struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,				int request_space, int reply_headroom){	struct sk_buff *rep_tlv_buf;	spin_lock_bh(&config_lock);	/* Save request and reply details in a well-known location */	req_tlv_area = request_area;	req_tlv_space = request_space;	rep_headroom = reply_headroom;	/* Check command authorization */	if (likely(orig_node == tipc_own_addr)) {		/* command is permitted */	} else if (cmd >= 0x8000) {		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED							  " (cannot be done remotely)");		goto exit;	} else if (!tipc_remote_management) {		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);		goto exit;	}	else if (cmd >= 0x4000) {		u32 domain = 0;		if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||		    (domain != orig_node)) {			rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);			goto exit;		}	}	/* Call appropriate processing routine */	switch (cmd) {	case TIPC_CMD_NOOP:		rep_tlv_buf = tipc_cfg_reply_none();		break;	case TIPC_CMD_GET_NODES:		rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_GET_LINKS:		rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_SHOW_LINK_STATS:		rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_RESET_LINK_STATS:		rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_SHOW_NAME_TABLE:		rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_GET_BEARER_NAMES:		rep_tlv_buf = tipc_bearer_get_names();		break;	case TIPC_CMD_GET_MEDIA_NAMES:		rep_tlv_buf = tipc_media_get_names();		break;	case TIPC_CMD_SHOW_PORTS:		rep_tlv_buf = tipc_port_get_ports();		break;#if 0	case TIPC_CMD_SHOW_PORT_STATS:		rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_RESET_PORT_STATS:		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);		break;#endif	case TIPC_CMD_SET_LOG_SIZE:		rep_tlv_buf = tipc_log_resize(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_DUMP_LOG:		rep_tlv_buf = tipc_log_dump();		break;	case TIPC_CMD_SET_LINK_TOL:	case TIPC_CMD_SET_LINK_PRI:	case TIPC_CMD_SET_LINK_WINDOW:		rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);		break;	case TIPC_CMD_ENABLE_BEARER:		rep_tlv_buf = cfg_enable_bearer();		break;	case TIPC_CMD_DISABLE_BEARER:		rep_tlv_buf = cfg_disable_bearer();		break;	case TIPC_CMD_SET_NODE_ADDR:		rep_tlv_buf = cfg_set_own_addr();		break;	case TIPC_CMD_SET_REMOTE_MNG:		rep_tlv_buf = cfg_set_remote_mng();		break;	case TIPC_CMD_SET_MAX_PORTS:		rep_tlv_buf = cfg_set_max_ports();		break;	case TIPC_CMD_SET_MAX_PUBL://.........这里部分代码省略.........

struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,				int request_space, int reply_headroom){	struct sk_buff *rep_tlv_buf;	rtnl_lock();	/* Save request and reply details in a well-known location */	req_tlv_area = request_area;	req_tlv_space = request_space;	rep_headroom = reply_headroom;	/* Check command authorization */	if (likely(in_own_node(orig_node))) {		/* command is permitted */	} else {		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED							  " (cannot be done remotely)");		goto exit;	}	/* Call appropriate processing routine */	switch (cmd) {	case TIPC_CMD_NOOP:		rep_tlv_buf = tipc_cfg_reply_none();		break;	case TIPC_CMD_GET_NODES:		rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_GET_LINKS:		rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_SHOW_LINK_STATS:		rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_RESET_LINK_STATS:		rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_SHOW_NAME_TABLE:		rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);		break;	case TIPC_CMD_GET_BEARER_NAMES:		rep_tlv_buf = tipc_bearer_get_names();		break;	case TIPC_CMD_GET_MEDIA_NAMES:		rep_tlv_buf = tipc_media_get_names();		break;	case TIPC_CMD_SHOW_PORTS:		rep_tlv_buf = tipc_sk_socks_show();		break;	case TIPC_CMD_SHOW_STATS:		rep_tlv_buf = tipc_show_stats();		break;	case TIPC_CMD_SET_LINK_TOL:	case TIPC_CMD_SET_LINK_PRI:	case TIPC_CMD_SET_LINK_WINDOW:		rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);		break;	case TIPC_CMD_ENABLE_BEARER:		rep_tlv_buf = cfg_enable_bearer();		break;	case TIPC_CMD_DISABLE_BEARER:		rep_tlv_buf = cfg_disable_bearer();		break;	case TIPC_CMD_SET_NODE_ADDR:		rep_tlv_buf = cfg_set_own_addr();		break;	case TIPC_CMD_SET_MAX_PORTS:		rep_tlv_buf = cfg_set_max_ports();		break;	case TIPC_CMD_SET_NETID:		rep_tlv_buf = cfg_set_netid();		break;	case TIPC_CMD_GET_MAX_PORTS:		rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);		break;	case TIPC_CMD_GET_NETID:		rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);		break;	case TIPC_CMD_NOT_NET_ADMIN:		rep_tlv_buf =			tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);		break;	case TIPC_CMD_SET_MAX_ZONES:	case TIPC_CMD_GET_MAX_ZONES:	case TIPC_CMD_SET_MAX_SLAVES:	case TIPC_CMD_GET_MAX_SLAVES:	case TIPC_CMD_SET_MAX_CLUSTERS:	case TIPC_CMD_GET_MAX_CLUSTERS:	case TIPC_CMD_SET_MAX_NODES:	case TIPC_CMD_GET_MAX_NODES:	case TIPC_CMD_SET_MAX_SUBSCR:	case TIPC_CMD_GET_MAX_SUBSCR:	case TIPC_CMD_SET_MAX_PUBL:	case TIPC_CMD_GET_MAX_PUBL:	case TIPC_CMD_SET_LOG_SIZE:	case TIPC_CMD_SET_REMOTE_MNG:	case TIPC_CMD_GET_REMOTE_MNG:	case TIPC_CMD_DUMP_LOG:		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED//.........这里部分代码省略.........