tcp_seg_copy() function

Deallocates a list of TCP segments (tcp_seg structures).

Frees a TCP segment (tcp_seg structure).

Check if a segment's pbufs are used by someone else than TCP. This can happen on retransmission if the pbuf of this segment is still referenced by the netif driver due to deferred transmission. This is the case (only!) if someone down the TX call path called pbuf_ref() on one of the pbufs! @arg seg the tcp segment to check

Remove segments from a list if the incoming ACK acknowledges them

Called by tcp_output() to actually send a TCP segment over IP.