tcpcon.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 83 行

head	1.2;
access;
symbols;
locks
	dls:1.2; strict;
comment	@ * @;


1.2
date	97.09.21.19.30.11;	author dls;	state Dist;
branches;
next	1.1;

1.1
date	94.01.14.04.11.50;	author dls;	state v2e1;
branches;
next	;


desc
@@


1.2
log
@pre-3e code
@
text
@/* tcpcon.c - tcpcon */

#include <conf.h>
#include <kernel.h>
#include <network.h>

/*------------------------------------------------------------------------
 *  tcpcon - initiate a connection
 *------------------------------------------------------------------------
 */
int tcpcon(ptcb)
struct	tcb	*ptcb;
{
	struct	netif	*pni = ptcb->tcb_pni;
	struct	route	*prt, *rtget();
	Bool		local;
	int		error, mss;

	prt = (struct route *)rtget(ptcb->tcb_rip, RTF_REMOTE);
	local = prt && prt->rt_metric == 0;
	rtfree(prt);
	if (local)
		mss = ptcb->tcb_pni->ni_mtu-IPMHLEN-TCPMHLEN;
	else
		mss = 536;			/* RFC 1122 		*/
	ptcb->tcb_smss = mss;			/* default		*/
	ptcb->tcb_rmss = ptcb->tcb_smss;
	ptcb->tcb_swindow = ptcb->tcb_smss;	/* conservative		*/
	ptcb->tcb_cwnd = ptcb->tcb_smss;	/* 1 segment		*/
	ptcb->tcb_ssthresh = 65535;		/* IP Max window size	*/
	ptcb->tcb_rnext = 0;
	ptcb->tcb_finseq = 0;
	ptcb->tcb_pushseq = 0;
	ptcb->tcb_flags = TCBF_NEEDOUT|TCBF_FIRSTSEND;
	ptcb->tcb_ostate = TCPO_IDLE;
	ptcb->tcb_state = TCPS_SYNSENT;
	tcpkick(ptcb);
	ptcb->tcb_listenq = SYSERR;
	TcpActiveOpens++;
	signal(ptcb->tcb_mutex);
	wait(ptcb->tcb_ocsem);
	if (error = ptcb->tcb_error)
		tcbdealloc(ptcb);
	return error;			/* usually 0 */
}
@


1.1
log
@Initial revision
@
text
@@