/*------------------------------------------------------------------------
* tcpwr - write urgent and normal data to TCP buffers
*------------------------------------------------------------------------
*/
int
tcpwr(struct devsw *pdev, u_char *pch, unsigned len, Bool isurg)
{
struct tcb *ptcb = (struct tcb *)pdev->dvioblk;
int state = ptcb->tcb_state;
unsigned sboff;
int tocopy;
if (state != TCPS_ESTABLISHED && state != TCPS_CLOSEWAIT)
return SYSERR;
tocopy = tcpgetspace(ptcb, len); /* acquires tcb_mutex */
if (tocopy <= 0)
return tocopy;
sboff = (ptcb->tcb_sbstart+ptcb->tcb_sbcount) % ptcb->tcb_sbsize;
if (isurg) {
ptcb->tcb_supseq = ptcb->tcb_snext + len - 1;
ptcb->tcb_flags |= TCBF_SUPOK;
}
while (tocopy--) {
ptcb->tcb_sndbuf[sboff] = *pch++;
++ptcb->tcb_sbcount;
if (++sboff >= ptcb->tcb_sbsize)
sboff = 0;
}
ptcb->tcb_flags |= TCBF_NEEDOUT;
tcpwakeup(WRITERS, ptcb);
signal(ptcb->tcb_mutex);
if (isurg || ptcb->tcb_snext == ptcb->tcb_suna)
tcpkick(ptcb);
return len;
}
/*------------------------------------------------------------------------
* tcpostate - do TCP output state processing after an ACK
*------------------------------------------------------------------------
*/
int
tcpostate(struct tcb *ptcb, int acked)
{
if (acked <= 0)
return OK; /* no state change */
if (ptcb->tcb_ostate == TCPO_REXMT) {
ptcb->tcb_rexmtcount = 0;
ptcb->tcb_ostate = TCPO_XMIT;
}
if (ptcb->tcb_sbcount == 0) {
ptcb->tcb_ostate = TCPO_IDLE;
return OK;
}
tcpkick(ptcb);
return OK;
}
