Function socket_init

components/net/sal/src/sal_socket.c:456–526

* This function will initialize sal socket object and set socket options * * @param family protocol family * @param type socket type * @param protocol transfer Protocol * @param res sal socket object address * * @return 0 : socket initialize success * -1 : input the wrong family * -2 : input the wrong socket type * -3 : get network interface failed

 *         -4 : invalid protocol or combo
 */
static int socket_init(int family, int type, int protocol, struct sal_socket **res)
{
    struct sal_socket *sock;
    struct sal_proto_family *pf;
    struct netdev *netdv_def = netdev_default;
    struct netdev *netdev = RT_NULL;
    rt_bool_t flag = RT_FALSE;

    /* Existing range checks for family and type */
    if (family < 0 || family > AF_MAX)
    {
        LOG_E("Invalid family: %d (must be 0 ~ %d)", family, AF_MAX);
        return -1;
    }

    if (type < 0 || type > SOCK_MAX)
    {
        LOG_E("Invalid type: %d (must be 0 ~ %d)", type, SOCK_MAX);
        return -2;
    }

    /* Range check for protocol */
    if (!VALID_PROTOCOL(protocol))
    {
        LOG_E("Invalid protocol: %d (must be 0 ~ %d)", protocol, IPPROTO_RAW);
        rt_set_errno(EINVAL);
        return -4;
    }

    sock = *res;
    sock->domain = family;
    sock->type = type;
    sock->protocol = protocol;

    /* Combo compatibility check */
    if (!VALID_COMBO(family, type, protocol))
    {
        LOG_E("Invalid combo: domain=%d, type=%d, protocol=%d", family, type, protocol);
        rt_set_errno(EINVAL);
        return -4;
    }

    /* Existing netdev selection logic */
    if (netdv_def && netdev_is_up(netdv_def))
    {
        /* check default network interface device protocol family */
        pf = (struct sal_proto_family *)netdv_def->sal_user_data;
        if (pf != RT_NULL && pf->skt_ops && (pf->family == family || pf->sec_family == family))
        {
            sock->netdev = netdv_def;
            flag = RT_TRUE;
        }
    }

    if (flag == RT_FALSE)
    {
        /* get network interface device by protocol family */
        netdev = netdev_get_by_family(family);