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...
...
...
#define NX_SOURCE_CODE
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_packet.h"
#include "nx_tcp.h"
...
...
VOID _nx_tcp_periodic_processing(NX_IP *ip_ptr)
{
#ifdef NX_ENABLE_TCP_KEEPALIVE
NX_TCP_SOCKET *socket_ptr;
ULONG sockets;
UINT keepalive_enabled = NX_FALSE;
sockets = ip_ptr -> nx_ip_tcp_created_sockets_count;
socket_ptr = ip_ptr -> nx_ip_tcp_created_sockets_ptr;
if (socket_ptr)
{
keepalive_enabled = socket_ptr -> nx_tcp_socket_keepalive_enabled;
}if (socket_ptr) { ... }
while ((sockets--) && socket_ptr)
{
if (keepalive_enabled)
{
if ((socket_ptr -> nx_tcp_socket_state == NX_TCP_ESTABLISHED) && (socket_ptr -> nx_tcp_socket_keepalive_timeout))
{
socket_ptr -> nx_tcp_socket_keepalive_timeout--;
if (!socket_ptr -> nx_tcp_socket_keepalive_timeout)
{
/* ... */
socket_ptr -> nx_tcp_socket_keepalive_retries++;
if (socket_ptr -> nx_tcp_socket_keepalive_retries <= NX_TCP_KEEPALIVE_RETRIES)
{
/* ... */
socket_ptr -> nx_tcp_socket_keepalive_timeout = NX_TCP_KEEPALIVE_RETRY;
/* ... */
_nx_tcp_packet_send_ack(socket_ptr, (socket_ptr -> nx_tcp_socket_tx_sequence - 1));
}if (socket_ptr -> nx_tcp_socket_keepalive_retries <= NX_TCP_KEEPALIVE_RETRIES) { ... }
else
{
/* ... */
_nx_tcp_socket_connection_reset(socket_ptr);
}else { ... }
}if (!socket_ptr -> nx_tcp_socket_keepalive_timeout) { ... }
}if ((socket_ptr -> nx_tcp_socket_state == NX_TCP_ESTABLISHED) && (socket_ptr -> nx_tcp_socket_keepalive_timeout)) { ... }
}if (keepalive_enabled) { ... }
socket_ptr = socket_ptr -> nx_tcp_socket_created_next;
keepalive_enabled = socket_ptr -> nx_tcp_socket_keepalive_enabled;
}while ((sockets--) && socket_ptr) { ... }
/* ... */#else
NX_PARAMETER_NOT_USED(ip_ptr);
#endif
}{ ... }