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| void | net_isq (void) |
| | The main polling function for processing sockets, must be periodically called in the main application. More...
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This is the "working horse" of the TCP/IP stack. net_isq() must be called regularly to handle background activities: listen for incoming connections, transfer queued data, resolve host names, provide ARP resolution, retransmit data, etc. For example, if you want to send a packet to a host called www.mydomain.com and the IP address is unknown, the net_isq() will start a DNS request and tries to resolve the name.
net_isq() can be called in your main program loop, from a periodic timer interrupt, or as a periodic task in a RTOS environment.
In pseudo code the net_isq() performs the following functions:
{
if (
net_isq() is already running )
return;
if ( Hardware Interrupt is active ) return;
if ( not configured for interrupts ) check_hardware_event();
if ( DHCP request pending ) send_DHCP_request();
if ( ICMP pending ) check_ICMP_event();
check all received data
for call-back events and call
user call-back
check all pending transmit packets and try to retransmit
if ( ARP pending ) check_ARP_event();
if ( DNS required ) resolve name();
if ( DHCP response ) receive_DHCP();
handle all timers;
}
- Parameters
-
- Returns
- nothing
- Library:
- net.lib
- Prototype:
- net.h
- See also
- Introduction
- Examples:
- Blocksend.c, Chat.c, DHCPTest.c, DNSTest.c, Echo.c, FTPClient.c, FTPServer.c, HTTPdynamic.c, HTTPjava.c, HTTPsimple.c, Multicast.c, NetTest.c, Ping.c, Ping2.c, PServer.c, Receive.c, Send.c, SMTP.c, SNTPTest.c, and Telnet.c.
