4.1cBSD/a/sys/sys/uipc_pipe.c

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/*	uipc_pipe.c	4.18	82/10/31	*/

#include "../h/param.h"
#include "../h/mbuf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../h/unpcb.h"

#define	PIPSIZ	4096

/*
 * Sneakily connect a pipe from wso to rso.
 * This will get cleaned up when socketpair is added.
 */
piconnect(wso, rso)
	struct socket *wso, *rso;
{

	/* when we reserve memory this routine may fail */
	sotounpcb(wso)->unp_conn = sotounpcb(rso);
	sotounpcb(rso)->unp_conn = sotounpcb(wso);
	wso->so_snd.sb_hiwat = PIPSIZ;
	wso->so_snd.sb_mbmax = 2*PIPSIZ;
	wso->so_state |= SS_ISCONNECTED|SS_CANTRCVMORE;
	rso->so_rcv.sb_hiwat = 0;
	rso->so_rcv.sb_mbmax = 0;
	rso->so_state |= SS_ISCONNECTED|SS_CANTSENDMORE;
	return (1);
}