[unix-history] / sys / kern / fifo_vnops.c

/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)fifo_vnops.c	7.7 (Berkeley) 4/15/91
 *	$Id: fifo_vnops.c,v 1.4 1993/10/16 15:24:02 rgrimes Exp $
 */

#ifdef	FIFO
#include "param.h"
#include "time.h"
#include "namei.h"
#include "vnode.h"
#include "socket.h"
#include "socketvar.h"
#include "stat.h"
#include "systm.h"
#include "ioctl.h"
#include "file.h"
#include "fifo.h"
#include "errno.h"
#include "malloc.h"

/*
 * This structure is associated with the FIFO vnode and stores
 * the state associated with the FIFO.
 */
struct fifoinfo {
	struct socket	*fi_readsock;
	struct socket	*fi_writesock;
	long		fi_readers;
	long		fi_writers;
};

struct vnodeops fifo_vnodeops = {
	fifo_lookup,		/* lookup */
	fifo_create,		/* create */
	fifo_mknod,		/* mknod */
	fifo_open,		/* open */
	fifo_close,		/* close */
	fifo_access,		/* access */
	fifo_getattr,		/* getattr */
	fifo_setattr,		/* setattr */
	fifo_read,		/* read */
	fifo_write,		/* write */
	fifo_ioctl,		/* ioctl */
	fifo_select,		/* select */
	fifo_mmap,		/* mmap */
	fifo_fsync,		/* fsync */
	fifo_seek,		/* seek */
	fifo_remove,		/* remove */
	fifo_link,		/* link */
	fifo_rename,		/* rename */
	fifo_mkdir,		/* mkdir */
	fifo_rmdir,		/* rmdir */
	fifo_symlink,		/* symlink */
	fifo_readdir,		/* readdir */
	fifo_readlink,		/* readlink */
	fifo_abortop,		/* abortop */
	fifo_inactive,		/* inactive */
	fifo_reclaim,		/* reclaim */
	fifo_lock,		/* lock */
	fifo_unlock,		/* unlock */
	fifo_bmap,		/* bmap */
	fifo_strategy,		/* strategy */
	fifo_print,		/* print */
	fifo_islocked,		/* islocked */
	fifo_advlock,		/* advlock */
};

/*
 * Trivial lookup routine that always fails.
 */
/* ARGSUSED */
int
fifo_lookup(vp, ndp, p)
	struct vnode *vp;
	struct nameidata *ndp;
	struct proc *p;
{

	ndp->ni_dvp = vp;
	ndp->ni_vp = NULL;
	return (ENOTDIR);
}

/*
 * Open called to set up a new instance of a fifo or
 * to find an active instance of a fifo.
 */
/* ARGSUSED */
int
fifo_open(vp, mode, cred, p)
	register struct vnode *vp;
	int mode;
	struct ucred *cred;
	struct proc *p;
{
	register struct fifoinfo *fip;
	struct socket *rso, *wso;
	int error;
	static char openstr[] = "fifo";

	if ((mode & (FREAD|FWRITE)) == (FREAD|FWRITE))
		return (EINVAL);
	if ((fip = vp->v_fifoinfo) == NULL) {
		MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
		vp->v_fifoinfo = fip;
		fip->fi_readers = fip->fi_writers = 0;
		if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
			free(fip, M_VNODE);
			vp->v_fifoinfo = NULL;
			return (error);
		}
		fip->fi_readsock = rso;
		if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
			(void)soclose(rso);
			free(fip, M_VNODE);
			vp->v_fifoinfo = NULL;
			return (error);
		}
		fip->fi_writesock = wso;
		if (error = unp_connect2(wso, rso)) {
			(void)soclose(wso);
			(void)soclose(rso);
			free(fip, M_VNODE);
			vp->v_fifoinfo = NULL;
			return (error);
		}
		wso->so_state |= SS_CANTRCVMORE;
		rso->so_state |= SS_CANTSENDMORE;
	}
	error = 0;
	if (mode & FREAD) {
		fip->fi_readers++;
		if (fip->fi_readers == 1) {
			fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
			if (fip->fi_writers > 0)
				wakeup((caddr_t)&fip->fi_writers);
		}
		if (mode & O_NONBLOCK)
			return (0);
		while (fip->fi_writers == 0) {
			VOP_UNLOCK(vp);
			error = tsleep((caddr_t)&fip->fi_readers, PSOCK | PCATCH,
			    		openstr, 0);
			VOP_LOCK(vp);
			if (error)
				break;
		}
	} else {
		fip->fi_writers++;
		if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) {
			error = ENXIO;
		} else {
			if (fip->fi_writers == 1) {
				fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
				if (fip->fi_readers > 0)
					wakeup((caddr_t)&fip->fi_readers);
			}
			while (fip->fi_readers == 0) {
				VOP_UNLOCK(vp);
				error = tsleep((caddr_t)&fip->fi_writers,
				    		PSOCK | PCATCH, openstr, 0);
				VOP_LOCK(vp);
				if (error)
					break;
			}
		}
	}
	if (error)
		fifo_close(vp, mode, cred, p);
	return (error);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
int
fifo_read(vp, uio, ioflag, cred)
	struct vnode *vp;
	register struct uio *uio;
	int ioflag;
	struct ucred *cred;
{
	register struct socket *rso = vp->v_fifoinfo->fi_readsock;
	int error, startresid;

#ifdef DIAGNOSTIC
	if (uio->uio_rw != UIO_READ)
		panic("fifo_read mode");
#endif
	if (uio->uio_resid == 0)
		return (0);
	if (ioflag & IO_NDELAY)
		rso->so_state |= SS_NBIO;
	startresid = uio->uio_resid;
	VOP_UNLOCK(vp);
	error = soreceive(rso, (struct mbuf **)0, uio, 
		(struct mbuf **)0, (struct mbuf **)0, (int *)0);
	VOP_LOCK(vp);
	/*
	 * Clear EOF indication after first such return.
	 */
	if (uio->uio_resid == startresid)
		rso->so_state &= ~SS_CANTRCVMORE;
	if (ioflag & IO_NDELAY)
		rso->so_state &= ~SS_NBIO;
	return (error);
}

/*
 * Vnode op for write
 */
/* ARGSUSED */
int
fifo_write(vp, uio, ioflag, cred)
	struct vnode *vp;
	register struct uio *uio;
	int ioflag;
	struct ucred *cred;
{
	struct socket *wso = vp->v_fifoinfo->fi_writesock;
	int error;

#ifdef DIAGNOSTIC
	if (uio->uio_rw != UIO_WRITE)
		panic("fifo_write mode");
#endif
	if (ioflag & IO_NDELAY)
		wso->so_state |= SS_NBIO;
	VOP_UNLOCK(vp);
	error = sosend(wso, (struct mbuf *)0, uio, 0, (struct mbuf *)0, 0);
	VOP_LOCK(vp);
	if (ioflag & IO_NDELAY)
		wso->so_state &= ~SS_NBIO;
	return (error);
}

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
int
fifo_ioctl(vp, com, data, fflag, cred, p)
	struct vnode *vp;
	int com;
	caddr_t data;
	int fflag;
	struct ucred *cred;
	struct proc *p;
{
	struct file filetmp;
	int error;

	if (com == FIONBIO)
		return (0);
	if (fflag & FREAD)
		filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	else
		filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
	return (soo_ioctl(&filetmp, com, data, p));
}

/* ARGSUSED */
int
fifo_select(vp, which, fflag, cred, p)
	struct vnode *vp;
	int which, fflag;
	struct ucred *cred;
	struct proc *p;
{
	struct file filetmp;
	int error;

	if (fflag & FREAD)
		filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	else
		filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
	return (soo_select(&filetmp, which, p));
}

/*
 * This is a noop, simply returning what one has been given.
 */
int
fifo_bmap(vp, bn, vpp, bnp)
	struct vnode *vp;
	daddr_t bn;
	struct vnode **vpp;
	daddr_t *bnp;
{

	if (vpp != NULL)
		*vpp = vp;
	if (bnp != NULL)
		*bnp = bn;
	return (0);
}

/*
 * At the moment we do not do any locking.
 */
/* ARGSUSED */
int
fifo_lock(vp)
	struct vnode *vp;
{

	return (0);
}

/* ARGSUSED */
int
fifo_unlock(vp)
	struct vnode *vp;
{

	return (0);
}

/*
 * Device close routine
 */
/* ARGSUSED */
int
fifo_close(vp, fflag, cred, p)
	register struct vnode *vp;
	int fflag;
	struct ucred *cred;
	struct proc *p;
{
	register struct fifoinfo *fip = vp->v_fifoinfo;
	int error1, error2;

	if (fflag & FWRITE) {
		fip->fi_writers--;
		if (fip->fi_writers == 0)
			socantrcvmore(fip->fi_readsock);
	} else {
		fip->fi_readers--;
		if (fip->fi_readers == 0)
			socantsendmore(fip->fi_writesock);
	}
	if (vp->v_usecount > 1)
		return (0);
	error1 = soclose(fip->fi_readsock);
	error2 = soclose(fip->fi_writesock);
	FREE(fip, M_VNODE);
	vp->v_fifoinfo = NULL;
	if (error1)
		return (error1);
	return (error2);
}

/*
 * Print out the contents of a fifo vnode.
 */
void
fifo_print(vp)
	struct vnode *vp;
{

	printf("tag VT_NON");
	fifo_printinfo(vp);
	printf("\n");
}

/*
 * Print out internal contents of a fifo vnode.
 */
void
fifo_printinfo(vp)
	struct vnode *vp;
{
	register struct fifoinfo *fip = vp->v_fifoinfo;

	printf(", fifo with %d readers and %d writers",
		fip->fi_readers, fip->fi_writers);
}

/*
 * Fifo failed operation
 */
int
fifo_ebadf()
{

	return (EBADF);
}

/*
 * Fifo advisory byte-level locks.
 */
/* ARGSUSED */
int
fifo_advlock(vp, id, op, fl, flags)
	struct vnode *vp;
	caddr_t id;
	int op;
	struct flock *fl;
	int flags;
{

	return (EOPNOTSUPP);
}

/*
 * Fifo bad operation
 */
int
fifo_badop()
{

	panic("fifo_badop called");
	/* NOTREACHED */
}
#endif	/*FIFO*/
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
600f7f07	33	* from: @(#)fifo_vnops.c 7.7 (Berkeley) 4/15/91
4c45483e	34	* $Id: fifo_vnops.c,v 1.4 1993/10/16 15:24:02 rgrimes Exp $
15637ed4 RG	35	*/
15637ed4 RG	36
cfdfcf49	37	#ifdef FIFO
15637ed4 RG	38	#include "param.h"
	39	#include "time.h"
	40	#include "namei.h"
	41	#include "vnode.h"
	42	#include "socket.h"
	43	#include "socketvar.h"
	44	#include "stat.h"
	45	#include "systm.h"
	46	#include "ioctl.h"
	47	#include "file.h"
	48	#include "fifo.h"
	49	#include "errno.h"
	50	#include "malloc.h"
	51
	52	/*
	53	* This structure is associated with the FIFO vnode and stores
	54	* the state associated with the FIFO.
	55	*/
	56	struct fifoinfo {
	57	struct socket *fi_readsock;
	58	struct socket *fi_writesock;
	59	long fi_readers;
	60	long fi_writers;
	61	};
	62
	63	struct vnodeops fifo_vnodeops = {
	64	fifo_lookup, /* lookup */
	65	fifo_create, /* create */
	66	fifo_mknod, /* mknod */
	67	fifo_open, /* open */
	68	fifo_close, /* close */
	69	fifo_access, /* access */
	70	fifo_getattr, /* getattr */
	71	fifo_setattr, /* setattr */
	72	fifo_read, /* read */
	73	fifo_write, /* write */
	74	fifo_ioctl, /* ioctl */
	75	fifo_select, /* select */
	76	fifo_mmap, /* mmap */
	77	fifo_fsync, /* fsync */
	78	fifo_seek, /* seek */
	79	fifo_remove, /* remove */
	80	fifo_link, /* link */
	81	fifo_rename, /* rename */
	82	fifo_mkdir, /* mkdir */
	83	fifo_rmdir, /* rmdir */
	84	fifo_symlink, /* symlink */
	85	fifo_readdir, /* readdir */
	86	fifo_readlink, /* readlink */
	87	fifo_abortop, /* abortop */
	88	fifo_inactive, /* inactive */
	89	fifo_reclaim, /* reclaim */
	90	fifo_lock, /* lock */
	91	fifo_unlock, /* unlock */
	92	fifo_bmap, /* bmap */
	93	fifo_strategy, /* strategy */
	94	fifo_print, /* print */
	95	fifo_islocked, /* islocked */
	96	fifo_advlock, /* advlock */
	97	};
	98
	99	/*
	100	* Trivial lookup routine that always fails.
	101	*/
102	/* ARGSUSED */
4c45483e	103	int
15637ed4 RG	104	fifo_lookup(vp, ndp, p)
	105	struct vnode *vp;
	106	struct nameidata *ndp;
	107	struct proc *p;
	108	{
	109
	110	ndp->ni_dvp = vp;
	111	ndp->ni_vp = NULL;
	112	return (ENOTDIR);
	113	}
	114
	115	/*
	116	* Open called to set up a new instance of a fifo or
	117	* to find an active instance of a fifo.
	118	*/
	119	/* ARGSUSED */
4c45483e	120	int
15637ed4 RG	121	fifo_open(vp, mode, cred, p)
	122	register struct vnode *vp;
	123	int mode;
	124	struct ucred *cred;
	125	struct proc *p;
	126	{
	127	register struct fifoinfo *fip;
	128	struct socket rso, wso;
	129	int error;
	130	static char openstr[] = "fifo";
	131
	132	if ((mode & (FREAD\|FWRITE)) == (FREAD\|FWRITE))
	133	return (EINVAL);
	134	if ((fip = vp->v_fifoinfo) == NULL) {
	135	MALLOC(fip, struct fifoinfo , sizeof(fip), M_VNODE, M_WAITOK);
	136	vp->v_fifoinfo = fip;
	137	fip->fi_readers = fip->fi_writers = 0;
	138	if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
	139	free(fip, M_VNODE);
	140	vp->v_fifoinfo = NULL;
	141	return (error);
	142	}
	143	fip->fi_readsock = rso;
	144	if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
	145	(void)soclose(rso);
	146	free(fip, M_VNODE);
	147	vp->v_fifoinfo = NULL;
	148	return (error);
	149	}
	150	fip->fi_writesock = wso;
	151	if (error = unp_connect2(wso, rso)) {
	152	(void)soclose(wso);
	153	(void)soclose(rso);
	154	free(fip, M_VNODE);
	155	vp->v_fifoinfo = NULL;
	156	return (error);
	157	}
	158	wso->so_state \|= SS_CANTRCVMORE;
	159	rso->so_state \|= SS_CANTSENDMORE;
	160	}
	161	error = 0;
	162	if (mode & FREAD) {
	163	fip->fi_readers++;
	164	if (fip->fi_readers == 1) {
	165	fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
	166	if (fip->fi_writers > 0)
	167	wakeup((caddr_t)&fip->fi_writers);
	168	}
	169	if (mode & O_NONBLOCK)
	170	return (0);
	171	while (fip->fi_writers == 0) {
	172	VOP_UNLOCK(vp);
	173	error = tsleep((caddr_t)&fip->fi_readers, PSOCK \| PCATCH,
	174	openstr, 0);
	175	VOP_LOCK(vp);
	176	if (error)
	177	break;
	178	}
	179	} else {
	180	fip->fi_writers++;
	181	if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) {
	182	error = ENXIO;
	183	} else {
	184	if (fip->fi_writers == 1) {
185	fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
186	if (fip->fi_readers > 0)
187	wakeup((caddr_t)&fip->fi_readers);
188	}
189	while (fip->fi_readers == 0) {
190	VOP_UNLOCK(vp);
191	error = tsleep((caddr_t)&fip->fi_writers,
192	PSOCK \| PCATCH, openstr, 0);
193	VOP_LOCK(vp);
194	if (error)
195	break;
196	}
197	}
198	}
199	if (error)
200	fifo_close(vp, mode, cred, p);
201	return (error);
202	}
203
204	/*
205	* Vnode op for read
206	*/
207	/* ARGSUSED */
4c45483e	208	int
15637ed4 RG	209	fifo_read(vp, uio, ioflag, cred)
	210	struct vnode *vp;
	211	register struct uio *uio;
	212	int ioflag;
	213	struct ucred *cred;
	214	{
	215	register struct socket *rso = vp->v_fifoinfo->fi_readsock;
	216	int error, startresid;
	217
	218	#ifdef DIAGNOSTIC
	219	if (uio->uio_rw != UIO_READ)
	220	panic("fifo_read mode");
	221	#endif
	222	if (uio->uio_resid == 0)
	223	return (0);
	224	if (ioflag & IO_NDELAY)
	225	rso->so_state \|= SS_NBIO;
	226	startresid = uio->uio_resid;
	227	VOP_UNLOCK(vp);
4c45483e GW	228	error = soreceive(rso, (struct mbuf **)0, uio,
4c45483e GW	229	(struct mbuf )0, (struct mbuf )0, (int *)0);
15637ed4 RG	230	VOP_LOCK(vp);
	231	/*
	232	* Clear EOF indication after first such return.
	233	*/
	234	if (uio->uio_resid == startresid)
	235	rso->so_state &= ~SS_CANTRCVMORE;
	236	if (ioflag & IO_NDELAY)
	237	rso->so_state &= ~SS_NBIO;
	238	return (error);
	239	}
	240
	241	/*
	242	* Vnode op for write
	243	*/
	244	/* ARGSUSED */
4c45483e	245	int
15637ed4 RG	246	fifo_write(vp, uio, ioflag, cred)
	247	struct vnode *vp;
	248	register struct uio *uio;
	249	int ioflag;
	250	struct ucred *cred;
	251	{
	252	struct socket *wso = vp->v_fifoinfo->fi_writesock;
	253	int error;
	254
	255	#ifdef DIAGNOSTIC
	256	if (uio->uio_rw != UIO_WRITE)
	257	panic("fifo_write mode");
	258	#endif
	259	if (ioflag & IO_NDELAY)
	260	wso->so_state \|= SS_NBIO;
	261	VOP_UNLOCK(vp);
8604ac85	262	error = sosend(wso, (struct mbuf )0, uio, 0, (struct mbuf )0, 0);
15637ed4 RG	263	VOP_LOCK(vp);
	264	if (ioflag & IO_NDELAY)
	265	wso->so_state &= ~SS_NBIO;
	266	return (error);
	267	}
	268
	269	/*
	270	* Device ioctl operation.
	271	*/
	272	/* ARGSUSED */
4c45483e	273	int
15637ed4 RG	274	fifo_ioctl(vp, com, data, fflag, cred, p)
	275	struct vnode *vp;
	276	int com;
	277	caddr_t data;
	278	int fflag;
	279	struct ucred *cred;
	280	struct proc *p;
	281	{
	282	struct file filetmp;
	283	int error;
	284
	285	if (com == FIONBIO)
	286	return (0);
	287	if (fflag & FREAD)
	288	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	289	else
	290	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
	291	return (soo_ioctl(&filetmp, com, data, p));
	292	}
	293
	294	/* ARGSUSED */
4c45483e	295	int
15637ed4 RG	296	fifo_select(vp, which, fflag, cred, p)
	297	struct vnode *vp;
	298	int which, fflag;
	299	struct ucred *cred;
	300	struct proc *p;
	301	{
	302	struct file filetmp;
	303	int error;
	304
	305	if (fflag & FREAD)
	306	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	307	else
	308	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
	309	return (soo_select(&filetmp, which, p));
	310	}
	311
	312	/*
	313	* This is a noop, simply returning what one has been given.
	314	*/
4c45483e	315	int
15637ed4 RG	316	fifo_bmap(vp, bn, vpp, bnp)
	317	struct vnode *vp;
	318	daddr_t bn;
	319	struct vnode **vpp;
	320	daddr_t *bnp;
	321	{
	322
	323	if (vpp != NULL)
	324	*vpp = vp;
	325	if (bnp != NULL)
	326	*bnp = bn;
	327	return (0);
	328	}
	329
	330	/*
	331	* At the moment we do not do any locking.
	332	*/
	333	/* ARGSUSED */
4c45483e	334	int
15637ed4 RG	335	fifo_lock(vp)
	336	struct vnode *vp;
	337	{
	338
	339	return (0);
	340	}
	341
	342	/* ARGSUSED */
4c45483e	343	int
15637ed4 RG	344	fifo_unlock(vp)
	345	struct vnode *vp;
	346	{
	347
	348	return (0);
	349	}
	350
	351	/*
	352	* Device close routine
	353	*/
	354	/* ARGSUSED */
4c45483e	355	int
15637ed4 RG	356	fifo_close(vp, fflag, cred, p)
	357	register struct vnode *vp;
	358	int fflag;
	359	struct ucred *cred;
	360	struct proc *p;
	361	{
	362	register struct fifoinfo *fip = vp->v_fifoinfo;
	363	int error1, error2;
	364
	365	if (fflag & FWRITE) {
	366	fip->fi_writers--;
	367	if (fip->fi_writers == 0)
	368	socantrcvmore(fip->fi_readsock);
	369	} else {
	370	fip->fi_readers--;
	371	if (fip->fi_readers == 0)
	372	socantsendmore(fip->fi_writesock);
	373	}
	374	if (vp->v_usecount > 1)
	375	return (0);
	376	error1 = soclose(fip->fi_readsock);
	377	error2 = soclose(fip->fi_writesock);
	378	FREE(fip, M_VNODE);
	379	vp->v_fifoinfo = NULL;
	380	if (error1)
	381	return (error1);
	382	return (error2);
	383	}
	384
	385	/*
	386	* Print out the contents of a fifo vnode.
	387	*/
4c45483e	388	void
15637ed4 RG	389	fifo_print(vp)
	390	struct vnode *vp;
	391	{
	392
	393	printf("tag VT_NON");
	394	fifo_printinfo(vp);
	395	printf("\n");
	396	}
	397
	398	/*
	399	* Print out internal contents of a fifo vnode.
	400	*/
4c45483e	401	void
15637ed4 RG	402	fifo_printinfo(vp)
	403	struct vnode *vp;
	404	{
	405	register struct fifoinfo *fip = vp->v_fifoinfo;
	406
	407	printf(", fifo with %d readers and %d writers",
	408	fip->fi_readers, fip->fi_writers);
	409	}
	410
	411	/*
	412	* Fifo failed operation
	413	*/
4c45483e	414	int
15637ed4 RG	415	fifo_ebadf()
	416	{
	417
	418	return (EBADF);
	419	}
	420
	421	/*
	422	* Fifo advisory byte-level locks.
	423	*/
	424	/* ARGSUSED */
4c45483e	425	int
15637ed4 RG	426	fifo_advlock(vp, id, op, fl, flags)
	427	struct vnode *vp;
	428	caddr_t id;
	429	int op;
	430	struct flock *fl;
	431	int flags;
	432	{
	433
	434	return (EOPNOTSUPP);
	435	}
	436
	437	/*
	438	* Fifo bad operation
	439	*/
4c45483e	440	int
15637ed4 RG	441	fifo_badop()
	442	{
	443
	444	panic("fifo_badop called");
	445	/* NOTREACHED */
	446	}
cfdfcf49	447	#endif /FIFO/