关于在TI-RTOS上面支持IPv6问题

您好，下面是我写的关于UDP IPv6的代码：

Void sock_udp_ipv6(UArg arg0, UArg arg1)
{
sleep(5);
Task_Params params;
Error_Block eb;
SOCKET sock;
int dev_index = 1;
int status;
struct addrinfo hints;
struct addrinfo *results1 = NULL;
int value;
char port[8];
IP6N srcaddress;
static char src[] = "fe80::a00:9ff:fedc:aaaa";
if(IPv6StringToIPAddress((char *)&src[0],(IP6N*)&srcaddress)==-1)
{
UART_printf("\error.\n");
}
IPv6Init();
IPv6AddAddress(1,srcaddress,64,INFINITE_LT ,INFINITE_LT ,0);

fdOpenSession (TaskSelf ());
#if 1
if ((sock = socket (AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
{
UART_printf("\n sssss.\n");
return;
}

static char dst[] = "fe80::a00:9ff:fedc:abcd";
struct sockaddr_in6 stSockAdr;

stSockAdr.sin6_family = AF_INET6;
stSockAdr.sin6_port = NDK_htons(8899);
// inet_ntop(AF_INET6, (char *)&dst[0], &stSockAdr.sin6_addr, sizeof(stSockAdr.sin6_addr));
if(IPv6StringToIPAddress((char *)&dst[0],(IP6N*)&stSockAdr.sin6_addr)==-1)
{
UART_printf("\error.\n");
}

struct timeval to;
to.tv_sec = 3;
to.tv_usec = 0;
if(setsockopt( sock, SOL_SOCKET, SO_SNDTIMEO, &to, sizeof( to ))== SOCKET_ERROR){
UART_printf("\n er.\n");
}
if(setsockopt( sock, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof( to ))== SOCKET_ERROR){
UART_printf("\n er.\n");
}

int slen = sizeof(stSockAdr);

int result = 0,z = -5;
char buffer[5] = "hello";
while(1){
result = sendto(sock,buffer,sizeof(buffer),0,(struct sockaddr *)&stSockAdr,slen);
z= fdError();
UART_printf("write %d bytes\n", result);
UART_printf("z=%d bytes\n", z);

}
#endif
// Close the file session
fdCloseSession(TaskSelf());
}

但是在调试sendto函数的时候进入到

NETIF_DEVICE* NIMUFindByIndex (uint32_t index)
{
NETIF_DEVICE* ptr_device;

/* Get the head of the list. */
ptr_device = (NETIF_DEVICE *)list_get_head ((NDK_LIST_NODE**)&nimu_mcb.devices);
while (ptr_device != NULL)
{
/* Did we get the match? */
if (ptr_device->index == index)
return ptr_device;

/* Go to the next element. */
ptr_device = (NETIF_DEVICE*)list_get_next ((NDK_LIST_NODE*)ptr_device);
}

/* No matching entry found. */
return NULL;
}

每次返回的都是NULL，导致sendto函数执行sendto_error:

sendto_error:
/* Unlock the fd with error */
fdint_unlockfd(pfd, error);

llExit();

return (SOCKET_ERROR);

发数据的时候发送不出去。fdError()返回的值是22。