feat(LWIP): Socket(not server) must has linger

Server linger must be disable.

components/lwip/Kconfig

@@ -60,10 +60,6 @@ config LWIP_SO_RCVBUF
     help
         Enabling this option allows checking for available data on a netconn.
 
-config LWIP_SO_LINGER
-    bool "Enable SO_LINGER processing"
-    default n
-
 config LWIP_RECV_BUFSIZE_DEFAULT
     int "The default value for recv_bufsize"
     default 11680

components/lwip/apps/multi-threads/sockets_mt.c

@@ -706,6 +706,25 @@ static void lwip_sync_mt(int s, int how)
     }
 }
 
+#if LWIP_SO_LINGER
+static void lwip_socket_set_so_link(int s, int linger)
+{
+    struct lwip_sock *sock = get_socket(s);
+
+    if (sock) {
+        /*
+         * linker:
+         *     -1: nothing
+         *      0: free sent_buf immediately
+         */
+        sock->conn->linger = linger;
+    }
+}
+#else
+#error "LWIP_SO_LINGER must be enable"
+#endif
+
+
 int lwip_socket(int domain, int type, int protocol)
 {
     int s;
@@ -729,8 +748,10 @@ int lwip_socket(int domain, int type, int protocol)
         s = -1;
     }
 
-    if (s >= 0)
+    if (s >= 0) {
+        lwip_socket_set_so_link(s, 0);
         SOCK_MT_SET_SHUTDOWN(s, SOCK_MT_SHUTDOWN_NONE);
+    }
 
     return s;
 }
@@ -768,6 +789,8 @@ int lwip_listen(int s, int backlog)
 
     LWIP_ENTER_MT(s, SOCK_MT_STATE, SOCK_MT_STATE_LISTEN);
 
+    lwip_socket_set_so_link(s, -1);
+
     ret = lwip_listen_esp(s, backlog);
 
     LWIP_EXIT_MT(s, SOCK_MT_STATE, SOCK_MT_STATE_LISTEN);
@@ -782,6 +805,8 @@ int lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 
     LWIP_ENTER_MT(s, SOCK_MT_STATE, SOCK_MT_STATE_ACCEPT)
 
+    lwip_socket_set_so_link(s, -1);
+
     ret = lwip_accept_esp(s, addr, addrlen);
 
     LWIP_EXIT_MT(s, SOCK_MT_STATE, SOCK_MT_STATE_ACCEPT);
@@ -803,8 +828,10 @@ int lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
         ret = -1;
     }
 
-    if (ret >= 0)
+    if (ret >= 0) {
+        lwip_socket_set_so_link(s, 0);
         SOCK_MT_SET_SHUTDOWN(ret, SOCK_MT_SHUTDOWN_NONE);
+    }
 
     return ret;
 }
@@ -977,7 +1004,6 @@ int lwip_shutdown(int s, int how)
 }
 #endif
 
-
 int lwip_close(int s)
 {
     int ret;

components/lwip/port/esp8266/include/lwipopts.h

@@ -1404,7 +1404,7 @@
 /**
  * LWIP_SO_LINGER==1: Enable SO_LINGER processing.
  */
-#define LWIP_SO_LINGER                  CONFIG_LWIP_SO_LINGER
+#define LWIP_SO_LINGER                  1
 
 /**
  * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.

components/lwip/port/esp8266/netif/ethernetif.c

@@ -167,8 +167,8 @@ static int8_t low_level_output(struct netif* netif, struct pbuf* p)
      * header, meaning we should not pass target low-level address here.
      */
     err = esp_aio_sendto(&aio, NULL, 0);
-    if (err == ERR_MEM)
-        err = ERR_OK;
+    if (err != ERR_OK)
+        goto error;
 
     return err;