#!/usr/sbin/dtrace -s

#pragma D option quiet
#pragma D option switchrate=25hz
#pragma D option temporal

/*
 * Watch TCP connection state transitions in real time.
 */

int last[int];

dtrace:::BEGIN
{
	printf(" %3s %12s %-18s %-20s    %-20s %s\n",
	    "CPU", "DELTA(us)", "CID", "OLD", "NEW", "TIMESTAMP");
}

tcp:::state-change
{
	this->elapsed = (timestamp - last[args[1]->cs_cid]) / 1000;
	printf(" %3d %12d %-18x %-20s -> %-20s %d\n", cpu, this->elapsed,
	    args[1]->cs_cid, tcp_state_string[args[5]->tcps_state],
	    tcp_state_string[args[3]->tcps_state], timestamp);
	last[args[1]->cs_cid] = timestamp;
}

tcp:::state-change
/last[args[1]->cs_cid] == 0/
{
	printf(" %3d %12s %-18x %-20s -> %-20s %d\n", cpu, "-",
	    args[1]->cs_cid, tcp_state_string[args[5]->tcps_state],
	    tcp_state_string[args[3]->tcps_state], timestamp);
	last[args[1]->cs_cid] = timestamp;
}