Miscellaneous Library Functions

9.6timeouts.c

This file contains a single function, inet_timer(), that you must call at least twice per second if you are using a superloop system. It calls the polling routine for the following protocols:

•IP (for fragment reassembly)

•TCP

•Modem

•PPP

•DHCP Client

•DHCP Server

•DNS Client

•NAT Router

•RIP.

The following code shows a tk_yield() function that uses inet_timer().

/*

**tk_yield() - this is called whenever the program is looping

**waiting for user (or network) input. It handles the various

**background work needed such as polling alarm conditions and

**de-multiplexing incoming packets.

*/

extern void inet_timer(void);

smtpalert_task(); /* email alerter... */ #endif

#ifdef UDPSTEST

Miscellaneous Library Functions

udp_echo_poll(); /* UDP echo client/server */ #endif

#ifdef TCP_ECHOTEST

tcp_echo_poll(); /* TCP echo client/server */ #endif

}

Miscellaneous Library Functions

9.7testmenu.c

This file adds three commands to the diagnostic menus system:

These routines allow you to send a large number of ICMP ECHO requests or ARP requests to a target host. The default is for these routines to send 100 requests in quick succession to the current default host. You can change the number of requests using the fcount command, and you can also change the default host using the host command.

Note

Flood ARP must only be used on isolated test networks, as it may disrupt network access for any or all other hosts on the network.