net: Remove the unused nx_send to prefer psock_send for kernel

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

include/nuttx/net/net.h

@@ -68,11 +68,9 @@
  */
 
 #if !defined(CONFIG_BUILD_FLAT) && defined(__KERNEL__)
-#  define _NX_SEND(s,b,l,f)         nx_send(s,b,l,f)
 #  define _NX_RECV(s,b,l,f)         nx_recv(s,b,l,f)
 #  define _NX_RECVFROM(s,b,l,f,a,n) nx_recvfrom(s,b,l,f,a,n)
 #else
-#  define _NX_SEND(s,b,l,f)         send(s,b,l,f)
 #  define _NX_RECV(s,b,l,f)         recv(s,b,l,f)
 #  define _NX_RECVFROM(s,b,l,f,a,n) recvfrom(s,b,l,f,a,n)
 #endif
@@ -927,36 +925,6 @@ ssize_t psock_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
 ssize_t psock_send(FAR struct socket *psock, const void *buf, size_t len,
                    int flags);
 
-/****************************************************************************
- * Name: nx_send
- *
- * Description:
- *   The nx_send() call may be used only when the socket is in a
- *   connected state (so that the intended recipient is known).  This is an
- *   internal OS interface.  It is functionally equivalent to send() except
- *   that:
- *
- *   - It is not a cancellation point, and
- *   - It does not modify the errno variable.
- *
- *   See comments with send() for more a more complete description of the
- *   functionality.
- *
- * Input Parameters:
- *   sockfd   Socket descriptor of the socket
- *   buf      Data to send
- *   len      Length of data to send
- *   flags    Send flags
- *
- * Returned Value:
- *   On success, returns the number of characters sent.  On any failure, a
- *   negated errno value is returned (See comments with send() for a list
- *   of the appropriate errno value).
- *
- ****************************************************************************/
-
-ssize_t nx_send(int sockfd, FAR const void *buf, size_t len, int flags);
-
 /****************************************************************************
  * Name: psock_sendto
  *
@@ -1326,7 +1294,6 @@ int psock_ioctl(FAR struct socket *psock, int cmd, ...);
  ****************************************************************************/
 
 struct pollfd; /* Forward reference -- see poll.h */
-
 int psock_poll(FAR struct socket *psock, struct pollfd *fds, bool setup);
 
 /****************************************************************************

net/socket/send.c

@@ -90,47 +90,6 @@ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
   return psock_sendmsg(psock, &msg, flags);
 }
 
-/****************************************************************************
- * Name: nx_send
- *
- * Description:
- *   The nx_send() call may be used only when the socket is in a
- *   connected state (so that the intended recipient is known).  This is an
- *   internal OS interface.  It is functionally equivalent to send() except
- *   that:
- *
- *   - It is not a cancellation point, and
- *   - It does not modify the errno variable.
- *
- *   See comments with send() for more a more complete description of the
- *   functionality.
- *
- * Input Parameters:
- *   sockfd   Socket descriptor of the socket
- *   buf      Data to send
- *   len      Length of data to send
- *   flags    Send flags
- *
- * Returned Value:
- *   On success, returns the number of characters sent.  On any failure, a
- *   negated errno value is returned (See comments with send() for a list
- *   of the appropriate errno value).
- *
- ****************************************************************************/
-
-ssize_t nx_send(int sockfd, FAR const void *buf, size_t len, int flags)
-{
-  FAR struct socket *psock;
-
-  /* Get the underlying socket structure */
-
-  psock = sockfd_socket(sockfd);
-
-  /* And let psock_send do all of the work */
-
-  return psock_send(psock, buf, len, flags);
-}
-
 /****************************************************************************
  * Name: send
  *
@@ -197,18 +156,23 @@ ssize_t nx_send(int sockfd, FAR const void *buf, size_t len, int flags)
 
 ssize_t send(int sockfd, FAR const void *buf, size_t len, int flags)
 {
+  FAR struct socket *psock;
   ssize_t ret;
 
   /* send() is a cancellation point */
 
   enter_cancellation_point();
 
-  /* Let psock_send() do all of the work */
+  /* Get the underlying socket structure */
 
-  ret = nx_send(sockfd, buf, len, flags);
+  psock = sockfd_socket(sockfd);
+
+  /* And let psock_send do all of the work */
+
+  ret = psock_send(psock, buf, len, flags);
   if (ret < 0)
     {
-      _SO_SETERRNO(sockfd_socket(sockfd), -ret);
+      _SO_SETERRNO(psock, -ret);
       ret = ERROR;
     }