On Time RTOS-32 Documentation

RTIP-32 Programming Manual

RTIP-32 Reference Manual

RTIP-32 Configuration

Simplified Networking API

Extended RTIP-32 API

Function vf_init

Function xn_add_dns_server

Function xn_add_host_table_entry

Function xn_clear_host_cache

Function xn_delete_host_table_entry

Function xn_get_domain_name

Function xn_has_dns

Function xn_set_domain_name

Function xn_set_server_list

Function xn_name2ip_addr

Function xn_abort

Function xn_arp_send

Function xn_attach

Function xn_bootp_res

Function xn_bootp

Function xn_debug_error

Function xn_getlasterror

Function xn_geterror_string

Function xn_interface_close

Function xn_interface_info

Function xn_interface_mcast

Function xn_interface_open

Function xn_interface_open_config

Function xn_interface_opt

Function xn_interface_ethernet_statistics

Function xn_interface_statistics

Function xn_ip_set_option

Function xn_ping

Function xn_pkt_data_max

Function xn_rarp

Function xn_rt_add

Function xn_rt_cycle_gw

Function xn_rt_del

Function xn_rt_replace

Function xn_rtip_exit

Function xn_rtip_init

Function xn_rtip_restart

Function xn_set_ip

Function xn_tcp_is_connect

Function xn_tcp_is_read

Function xn_tcp_is_write

Function xn_wait_tcp_output

Function xn_autoanswer

Function xn_autologin

Function xn_hangup

Function xn_scriptlogin

Function xn_autoip

Function xn_ioacc_init

Function xn_nat_init

Function xn_arp_add

Function xn_arp_del

Function xn_arp_remote

Function xn_arp_cache_lookup

Function xn_send_ethernet_frame

Function xn_callbacks

Function cb_wr_screen_string_fnc

Function cb_rs232_connection_lost_fnc

Function cb_error_report_fnc

Function cb_raw_mode_in_char_fnc

Function cb_autoip_new_ip_fnc

Function cb_autoip_no_ip_fnc

Function cb_packetin_isr

Function cb_packetin_task

Function cb_packetout

Previous

Next

Function xn_has_dns

This function determines whether a DNS server is known.

int xn_has_dns(void);

The return value is non-zero if RTIP-32 has the address of at least one DNS server and the local host has a domain name set with xn_set_domain_name. If an error occurred, call xn_getlasterror and xn_geterror_string to return the error value. Section Error Codes further describes each error.

A DNS server can be set up through xn_set_server_list, xn_dhcp or PPP.

Left Extended RTIP-32 API

Function xn_get_domain_name

Down Function xn_set_domain_name