Separate net/net_send_buffered.c and net/net_send_unbuffered.c to net/tcp/tcp_send_buffered.c, net/tcp/tcp_send_unbuffered.c, and pkt/pkt_send.c

net/tcp/Make.defs

@@ -39,6 +39,16 @@ ifeq ($(CONFIG_NET),y)
 
 ifeq ($(CONFIG_NET_TCP),y)
 
+# Socket layer
+
+ifeq ($(CONFIG_NET_TCP_WRITE_BUFFERS),y)
+SOCK_CSRCS += tcp_send_buffered.c
+else
+SOCK_CSRCS += tcp_send_unbuffered.c
+endif
+
+# Transport layer
+
 NET_CSRCS += tcp_conn.c tcp_seqno.c tcp_poll.c tcp_timer.c tcp_send.c
 NET_CSRCS += tcp_input.c tcp_appsend.c tcp_listen.c tcp_callback.c
 NET_CSRCS += tcp_backlog.c

net/tcp/tcp.h

@@ -42,6 +42,8 @@
 
 #include <nuttx/config.h>
 
+#include <sys/types.h>
+
 #ifdef CONFIG_NET_TCP
 
 /****************************************************************************
@@ -68,6 +70,66 @@ extern "C"
  * Public Function Prototypes
  ****************************************************************************/
 
+/****************************************************************************
+ * Function: tcp_send
+ *
+ * Description:
+ *   The tcp_send() call may be used only when the TCP socket is in a
+ *   connected state (so that the intended recipient is known).
+ *
+ * Parameters:
+ *   psock    An instance of the internal socket structure.
+ *   buf      Data to send
+ *   len      Length of data to send
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN or EWOULDBLOCK
+ *     The socket is marked non-blocking and the requested operation
+ *     would block.
+ *   EBADF
+ *     An invalid descriptor was specified.
+ *   ECONNRESET
+ *     Connection reset by peer.
+ *   EDESTADDRREQ
+ *     The socket is not connection-mode, and no peer address is set.
+ *   EFAULT
+ *      An invalid user space address was specified for a parameter.
+ *   EINTR
+ *      A signal occurred before any data was transmitted.
+ *   EINVAL
+ *      Invalid argument passed.
+ *   EISCONN
+ *     The connection-mode socket was connected already but a recipient
+ *     was specified. (Now either this error is returned, or the recipient
+ *     specification is ignored.)
+ *   EMSGSIZE
+ *     The socket type requires that message be sent atomically, and the
+ *     size of the message to be sent made this impossible.
+ *   ENOBUFS
+ *     The output queue for a network interface was full. This generally
+ *     indicates that the interface has stopped sending, but may be
+ *     caused by transient congestion.
+ *   ENOMEM
+ *     No memory available.
+ *   ENOTCONN
+ *     The socket is not connected, and no target has been given.
+ *   ENOTSOCK
+ *     The argument s is not a socket.
+ *   EPIPE
+ *     The local end has been shut down on a connection oriented socket.
+ *     In this case the process will also receive a SIGPIPE unless
+ *     MSG_NOSIGNAL is set.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+ssize_t tcp_send(FAR struct socket *psock, FAR const void *buf, size_t len);
+
 /****************************************************************************
  * Function: tcp_wrbuffer_initialize
  *