tcp_output_segment() function

the tcp_seg to send

the tcp_pcb for the TCP connection used to send the segment

the netif used to send the segment

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