1、解决do_pollfd函数中处理底层网络设备返回错误-1的情况，返回-1时select函数也要返回-1

2、网卡设备调用关闭dhcp时，底层要调用dhcp_stop函数来关闭dhcp功能，打开时再调用dhcp_start，否则再次打开dhcp时无法获取ip地址或者出现在使用静态ip地址会在dhcp租约到期时自动再获取ip地址。
3、sal_socket.c程序中的sal_accept函数增加判断网卡up,down的功能

2 files changed, 13 insertions, 0 deletions

diff --git a/components/net/lwip-2.0.2/src/netif/ethernetif.c b/components/net/lwip-2.0.2/src/netif/ethernetif.c
index 6c5621281c..8e90f0daf3 100644
--- a/components/net/lwip-2.0.2/src/netif/ethernetif.c
+++ b/components/net/lwip-2.0.2/src/netif/ethernetif.c
@@ -164,6 +164,16 @@ static int lwip_netdev_set_dns_server(struct netdev *netif, uint8_t dns_num, ip_
 static int lwip_netdev_set_dhcp(struct netdev *netif, rt_bool_t is_enabled)
 {
     netdev_low_level_set_dhcp_status(netif, is_enabled);
+
+	/*zhaoshimin 20200508 add dhcp start or stop must call dhcp_start and dhcp_stop function*/
+	if(is_enabled == RT_TRUE)
+	{
+		dhcp_start((struct netif *)netif->user_data);
+	}
+	else
+	{
+		dhcp_stop((struct netif *)netif->user_data);	
+	}
     return ERR_OK;
 }
 #endif /* RT_LWIP_DHCP */
diff --git a/components/net/sal_socket/src/sal_socket.c b/components/net/sal_socket/src/sal_socket.c
index e3bea5a28e..1e43896012 100644
--- a/components/net/sal_socket/src/sal_socket.c
+++ b/components/net/sal_socket/src/sal_socket.c
@@ -564,6 +564,9 @@ int sal_accept(int socket, struct sockaddr *addr, socklen_t *addrlen)
     /* get the socket object by socket descriptor */
     SAL_SOCKET_OBJ_GET(sock, socket);
 
+	/* check the network interface is up status  zhaoshimin add 20200509*/
+    SAL_NETDEV_IS_UP(sock->netdev);
+
     /* check the network interface socket operations */
     SAL_NETDEV_SOCKETOPS_VALID(sock->netdev, pf, accept);