1、web socket请求数据从服务器回来时，服务器会关闭连接，此时AT socket在读取返回的数据时不应该判断socket为连接的状态

2、sal socket在支持多网卡时，sal_getaddrinfo从A网卡获取的地址信息，在sal_freeaddrinfo释放时必须由A网卡进行释放

components/net/at/at_socket/at_socket.c

@@ -821,24 +821,17 @@ int at_recvfrom(int socket, void *mem, size_t len, int flags, struct sockaddr *f
             goto __exit;
         }
         else
-        {
+        {         
-            if (sock->state == AT_SOCKET_CONNECT)
+
+            /* get receive buffer to receiver ring buffer */
+            rt_mutex_take(sock->recv_lock, RT_WAITING_FOREVER);
+            recv_len = at_recvpkt_get(&(sock->recvpkt_list), (char *) mem, len);
+            rt_mutex_release(sock->recv_lock);
+            if (recv_len > 0)
             {
-                /* get receive buffer to receiver ring buffer */
+                break;
-                rt_mutex_take(sock->recv_lock, RT_WAITING_FOREVER);
-                recv_len = at_recvpkt_get(&(sock->recvpkt_list), (char *) mem, len);
-                rt_mutex_release(sock->recv_lock);
-                if (recv_len > 0)
-                {
-                    break;
-                }
-            }
-            else
-            {
-                LOG_D("received data exit, current socket (%d) is closed by remote.", socket);
-                result = 0;
-                goto __exit;
             }
+
         }
     }
 

components/net/sal_socket/src/sal_socket.c

@@ -41,6 +41,13 @@ struct sal_socket_table
     struct sal_socket **sockets;
 };
 
+/* record the netdev and res table*/
+struct sal_netdev_res_table
+{
+    struct addrinfo *res;
+    struct netdev *netdev; 
+};
+
 #ifdef SAL_USING_TLS
 /* The global TLS protocol options */
 static struct sal_proto_tls *proto_tls;
@@ -50,6 +57,7 @@ static struct sal_proto_tls *proto_tls;
 static struct sal_socket_table socket_table;
 static struct rt_mutex sal_core_lock;
 static rt_bool_t init_ok = RT_FALSE;
+static struct sal_netdev_res_table sal_dev_res_tbl[SAL_SOCKETS_NUM];
 
 #define IS_SOCKET_PROTO_TLS(sock)                (((sock)->protocol == PROTOCOL_TLS) || \
                                                  ((sock)->protocol == PROTOCOL_DTLS))
@@ -90,6 +98,11 @@ do {
     ((pf) = (struct sal_proto_family *) (netdev)->sal_user_data) != RT_NULL &&    \
     (pf)->netdb_ops->ops)                                                         \
 
+#define SAL_NETDBOPS_VALID(netdev, pf, ops)                                \
+    ((netdev) &&                                                                 \
+    ((pf) = (struct sal_proto_family *) (netdev)->sal_user_data) != RT_NULL &&    \
+    (pf)->netdb_ops->ops)                                                         \
+
 /**
  * SAL (Socket Abstraction Layer) initialize.
  *
@@ -116,6 +129,9 @@ int sal_init(void)
         return -1;
     }
 
+    /*init the dev_res table */
+    rt_memset(sal_dev_res_tbl,  0, sizeof(sal_dev_res_tbl));
+    
     /* create sal socket lock */
     rt_mutex_init(&sal_core_lock, "sal_lock", RT_IPC_FLAG_FIFO);
 
@@ -1086,10 +1102,12 @@ int sal_getaddrinfo(const char *nodename,
 {
     struct netdev *netdev = netdev_default;
     struct sal_proto_family *pf;
+    int     ret = 0;
+    rt_uint32_t i = 0;
 
     if (SAL_NETDEV_NETDBOPS_VALID(netdev, pf, getaddrinfo))
     {
-        return pf->netdb_ops->getaddrinfo(nodename, servname, hints, res);
+        ret = pf->netdb_ops->getaddrinfo(nodename, servname, hints, res);
     }
     else
     {
@@ -1097,30 +1115,56 @@ int sal_getaddrinfo(const char *nodename,
         netdev = netdev_get_first_by_flags(NETDEV_FLAG_UP);
         if (SAL_NETDEV_NETDBOPS_VALID(netdev, pf, getaddrinfo))
         {
-            return pf->netdb_ops->getaddrinfo(nodename, servname, hints, res);
+            ret = pf->netdb_ops->getaddrinfo(nodename, servname, hints, res);
+        }
+        else
+        {
+            ret = -1;
         }
     }
 
-    return -1;
+    if(ret == RT_EOK)
+    {
+        /*record the netdev and res*/
+        for(i = 0; i < SAL_SOCKETS_NUM; i++)
+        {
+            if(sal_dev_res_tbl[i].res == RT_NULL)
+            {
+                sal_dev_res_tbl[i].res = *res;
+                sal_dev_res_tbl[i].netdev = netdev;
+                break;
+            }
+        }
+
+        RT_ASSERT((i < SAL_SOCKETS_NUM));
+        
+    }
+
+    return ret;
 }
 
 void sal_freeaddrinfo(struct addrinfo *ai)
 {
-    struct netdev *netdev = netdev_default;
+    struct netdev *netdev = RT_NULL;
-    struct sal_proto_family *pf;
+    struct sal_proto_family *pf = RT_NULL;
+    rt_uint32_t  i = 0;
 
-    if (SAL_NETDEV_NETDBOPS_VALID(netdev, pf, freeaddrinfo))
+    /*when use the multi netdev, it must free the ai use the getaddrinfo netdev */
+    for(i = 0; i < SAL_SOCKETS_NUM; i++)
+    {
+        if(sal_dev_res_tbl[i].res == ai)
+        {
+            netdev = sal_dev_res_tbl[i].netdev;
+            sal_dev_res_tbl[i].res = RT_NULL;
+            sal_dev_res_tbl[i].netdev = RT_NULL;
+            break;
+        }
+    }
+    RT_ASSERT((i < SAL_SOCKETS_NUM));
+
+    if (SAL_NETDBOPS_VALID(netdev, pf, freeaddrinfo))
     {
         pf->netdb_ops->freeaddrinfo(ai);
     }
-    else
-    {
-        /* get the first network interface device with up status */
-        netdev = netdev_get_first_by_flags(NETDEV_FLAG_UP);
-        if (SAL_NETDEV_NETDBOPS_VALID(netdev, pf, freeaddrinfo))
-        {
-            pf->netdb_ops->freeaddrinfo(ai);
-        }
-    }
 }