[unix-history] / usr / src / sys / miscfs / fifofs / fifo_vnops.c

/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)fifo_vnops.c	7.8 (Berkeley) %G%
 */

#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 */
	fifo_blkatoff,		/* blkatoff */
	fifo_vget,		/* vget */
	fifo_valloc,		/* valloc */
	fifo_vfree,		/* vfree */
	fifo_truncate,		/* truncate */
	fifo_update,		/* update */
	fifo_bwrite,		/* bwrite */
};

/*
 * Trivial lookup routine that always fails.
 */
/* ARGSUSED */
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 */
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;
		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)
			if (error = tsleep((caddr_t)&fip->fi_readers, PSOCK,
			    openstr, 0))
				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)
				if (error = tsleep((caddr_t)&fip->fi_writers,
				    PSOCK, openstr, 0))
					break;
		}
	}
	if (error)
		fifo_close(vp, mode, cred, p);
	return (error);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
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, (int *)0,
		(struct mbuf **)0, (struct mbuf **)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 */
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);
	VOP_LOCK(vp);
	if (ioflag & IO_NDELAY)
		wso->so_state &= ~SS_NBIO;
	return (error);
}

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
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 */
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.
 */
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 */
fifo_lock(vp)
	struct vnode *vp;
{

	return (0);
}

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

	return (0);
}

/*
 * Device close routine
 */
/* ARGSUSED */
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.
 */
fifo_print(vp)
	struct vnode *vp;
{

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

/*
 * Print out internal contents of a fifo vnode.
 */
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
 */
fifo_ebadf()
{

	return (EBADF);
}

/*
 * Fifo advisory byte-level locks.
 */
/* ARGSUSED */
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
 */
fifo_badop()
{

	panic("fifo_badop called");
	/* NOTREACHED */
}
Commit	Line	Data
cc6b488e KM	1	/*
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
dbf0c423	5	* %sccs.include.redist.c%
cc6b488e	6	*
ffcee610	7	* @(#)fifo_vnops.c 7.8 (Berkeley) %G%
cc6b488e KM	8	*/
	9
	10	#include "param.h"
	11	#include "time.h"
	12	#include "namei.h"
	13	#include "vnode.h"
	14	#include "socket.h"
	15	#include "socketvar.h"
	16	#include "stat.h"
8429d022	17	#include "systm.h"
cc6b488e KM	18	#include "ioctl.h"
cc6b488e KM	19	#include "file.h"
81b4c293	20	#include "fifo.h"
cc6b488e KM	21	#include "errno.h"
	22	#include "malloc.h"
	23
	24	/*
	25	* This structure is associated with the FIFO vnode and stores
	26	* the state associated with the FIFO.
	27	*/
	28	struct fifoinfo {
	29	struct socket *fi_readsock;
	30	struct socket *fi_writesock;
	31	long fi_readers;
	32	long fi_writers;
	33	};
	34
cc6b488e KM	35	struct vnodeops fifo_vnodeops = {
cc6b488e KM	36	fifo_lookup, /* lookup */
81b4c293 KM	37	fifo_create, /* create */
81b4c293 KM	38	fifo_mknod, /* mknod */
cc6b488e KM	39	fifo_open, /* open */
cc6b488e KM	40	fifo_close, /* close */
81b4c293 KM	41	fifo_access, /* access */
	42	fifo_getattr, /* getattr */
	43	fifo_setattr, /* setattr */
cc6b488e KM	44	fifo_read, /* read */
	45	fifo_write, /* write */
	46	fifo_ioctl, /* ioctl */
	47	fifo_select, /* select */
81b4c293 KM	48	fifo_mmap, /* mmap */
	49	fifo_fsync, /* fsync */
	50	fifo_seek, /* seek */
	51	fifo_remove, /* remove */
	52	fifo_link, /* link */
	53	fifo_rename, /* rename */
	54	fifo_mkdir, /* mkdir */
	55	fifo_rmdir, /* rmdir */
	56	fifo_symlink, /* symlink */
	57	fifo_readdir, /* readdir */
	58	fifo_readlink, /* readlink */
	59	fifo_abortop, /* abortop */
	60	fifo_inactive, /* inactive */
	61	fifo_reclaim, /* reclaim */
cc6b488e KM	62	fifo_lock, /* lock */
	63	fifo_unlock, /* unlock */
	64	fifo_bmap, /* bmap */
81b4c293	65	fifo_strategy, /* strategy */
cc6b488e	66	fifo_print, /* print */
81b4c293	67	fifo_islocked, /* islocked */
a4128336	68	fifo_advlock, /* advlock */
ffcee610 KM	69	fifo_blkatoff, /* blkatoff */
	70	fifo_vget, /* vget */
	71	fifo_valloc, /* valloc */
	72	fifo_vfree, /* vfree */
	73	fifo_truncate, /* truncate */
	74	fifo_update, /* update */
	75	fifo_bwrite, /* bwrite */
cc6b488e KM	76	};
	77
	78	/*
	79	* Trivial lookup routine that always fails.
	80	*/
81b4c293 KM	81	/* ARGSUSED */
81b4c293 KM	82	fifo_lookup(vp, ndp, p)
cc6b488e KM	83	struct vnode *vp;
cc6b488e KM	84	struct nameidata *ndp;
81b4c293	85	struct proc *p;
cc6b488e KM	86	{
	87
	88	ndp->ni_dvp = vp;
	89	ndp->ni_vp = NULL;
	90	return (ENOTDIR);
	91	}
	92
	93	/*
	94	* Open called to set up a new instance of a fifo or
	95	* to find an active instance of a fifo.
	96	*/
	97	/* ARGSUSED */
81b4c293	98	fifo_open(vp, mode, cred, p)
cc6b488e KM	99	register struct vnode *vp;
	100	int mode;
	101	struct ucred *cred;
81b4c293	102	struct proc *p;
cc6b488e KM	103	{
	104	register struct fifoinfo *fip;
	105	struct socket rso, wso;
	106	int error;
bcc829cc	107	static char openstr[] = "fifo";
cc6b488e KM	108
	109	if ((mode & (FREAD\|FWRITE)) == (FREAD\|FWRITE))
	110	return (EINVAL);
	111	if ((fip = vp->v_fifoinfo) == NULL) {
	112	MALLOC(fip, struct fifoinfo , sizeof(fip), M_VNODE, M_WAITOK);
	113	vp->v_fifoinfo = fip;
ed89f575 KM	114	if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
	115	free(fip, M_VNODE);
	116	vp->v_fifoinfo = NULL;
cc6b488e	117	return (error);
ed89f575	118	}
cc6b488e KM	119	fip->fi_readsock = rso;
	120	if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
	121	(void)soclose(rso);
ed89f575 KM	122	free(fip, M_VNODE);
ed89f575 KM	123	vp->v_fifoinfo = NULL;
cc6b488e KM	124	return (error);
	125	}
	126	fip->fi_writesock = wso;
	127	if (error = unp_connect2(wso, rso)) {
	128	(void)soclose(wso);
	129	(void)soclose(rso);
ed89f575 KM	130	free(fip, M_VNODE);
ed89f575 KM	131	vp->v_fifoinfo = NULL;
cc6b488e KM	132	return (error);
	133	}
	134	wso->so_state \|= SS_CANTRCVMORE;
	135	rso->so_state \|= SS_CANTSENDMORE;
	136	}
	137	error = 0;
	138	if (mode & FREAD) {
	139	fip->fi_readers++;
	140	if (fip->fi_readers == 1) {
	141	fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
	142	if (fip->fi_writers > 0)
	143	wakeup((caddr_t)&fip->fi_writers);
	144	}
	145	if (mode & O_NONBLOCK)
	146	return (0);
	147	while (fip->fi_writers == 0)
bcc829cc MK	148	if (error = tsleep((caddr_t)&fip->fi_readers, PSOCK,
bcc829cc MK	149	openstr, 0))
cc6b488e KM	150	break;
	151	} else {
	152	fip->fi_writers++;
	153	if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) {
	154	error = ENXIO;
	155	} else {
	156	if (fip->fi_writers == 1) {
	157	fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
	158	if (fip->fi_readers > 0)
	159	wakeup((caddr_t)&fip->fi_readers);
	160	}
	161	while (fip->fi_readers == 0)
bcc829cc MK	162	if (error = tsleep((caddr_t)&fip->fi_writers,
bcc829cc MK	163	PSOCK, openstr, 0))
cc6b488e KM	164	break;
	165	}
	166	}
	167	if (error)
81b4c293	168	fifo_close(vp, mode, cred, p);
cc6b488e KM	169	return (error);
	170	}
	171
	172	/*
	173	* Vnode op for read
	174	*/
	175	/* ARGSUSED */
	176	fifo_read(vp, uio, ioflag, cred)
	177	struct vnode *vp;
	178	register struct uio *uio;
	179	int ioflag;
	180	struct ucred *cred;
	181	{
	182	register struct socket *rso = vp->v_fifoinfo->fi_readsock;
	183	int error, startresid;
	184
81b4c293	185	#ifdef DIAGNOSTIC
cc6b488e KM	186	if (uio->uio_rw != UIO_READ)
cc6b488e KM	187	panic("fifo_read mode");
81b4c293	188	#endif
cc6b488e KM	189	if (uio->uio_resid == 0)
	190	return (0);
	191	if (ioflag & IO_NDELAY)
	192	rso->so_state \|= SS_NBIO;
	193	startresid = uio->uio_resid;
	194	VOP_UNLOCK(vp);
	195	error = soreceive(rso, (struct mbuf *)0, uio, (int )0,
	196	(struct mbuf )0, (struct mbuf )0);
	197	VOP_LOCK(vp);
	198	/*
	199	* Clear EOF indication after first such return.
	200	*/
	201	if (uio->uio_resid == startresid)
	202	rso->so_state &= ~SS_CANTRCVMORE;
	203	if (ioflag & IO_NDELAY)
	204	rso->so_state &= ~SS_NBIO;
	205	return (error);
	206	}
	207
	208	/*
	209	* Vnode op for write
	210	*/
	211	/* ARGSUSED */
	212	fifo_write(vp, uio, ioflag, cred)
	213	struct vnode *vp;
	214	register struct uio *uio;
	215	int ioflag;
	216	struct ucred *cred;
	217	{
	218	struct socket *wso = vp->v_fifoinfo->fi_writesock;
	219	int error;
	220
81b4c293	221	#ifdef DIAGNOSTIC
cc6b488e KM	222	if (uio->uio_rw != UIO_WRITE)
cc6b488e KM	223	panic("fifo_write mode");
81b4c293	224	#endif
cc6b488e KM	225	if (ioflag & IO_NDELAY)
	226	wso->so_state \|= SS_NBIO;
	227	VOP_UNLOCK(vp);
	228	error = sosend(wso, (struct mbuf )0, uio, 0, (struct mbuf )0);
	229	VOP_LOCK(vp);
	230	if (ioflag & IO_NDELAY)
	231	wso->so_state &= ~SS_NBIO;
	232	return (error);
	233	}
	234
	235	/*
	236	* Device ioctl operation.
	237	*/
	238	/* ARGSUSED */
81b4c293	239	fifo_ioctl(vp, com, data, fflag, cred, p)
cc6b488e KM	240	struct vnode *vp;
	241	int com;
	242	caddr_t data;
	243	int fflag;
	244	struct ucred *cred;
81b4c293	245	struct proc *p;
cc6b488e KM	246	{
	247	struct file filetmp;
	248	int error;
	249
	250	if (com == FIONBIO)
	251	return (0);
	252	if (fflag & FREAD)
	253	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	254	else
	255	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
81b4c293	256	return (soo_ioctl(&filetmp, com, data, p));
cc6b488e KM	257	}
	258
	259	/* ARGSUSED */
81b4c293	260	fifo_select(vp, which, fflag, cred, p)
cc6b488e KM	261	struct vnode *vp;
	262	int which, fflag;
	263	struct ucred *cred;
81b4c293	264	struct proc *p;
cc6b488e KM	265	{
	266	struct file filetmp;
	267	int error;
	268
	269	if (fflag & FREAD)
	270	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	271	else
	272	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
81b4c293	273	return (soo_select(&filetmp, which, p));
cc6b488e KM	274	}
	275
	276	/*
	277	* This is a noop, simply returning what one has been given.
	278	*/
	279	fifo_bmap(vp, bn, vpp, bnp)
	280	struct vnode *vp;
	281	daddr_t bn;
	282	struct vnode **vpp;
	283	daddr_t *bnp;
	284	{
	285
	286	if (vpp != NULL)
	287	*vpp = vp;
	288	if (bnp != NULL)
	289	*bnp = bn;
	290	return (0);
	291	}
	292
	293	/*
	294	* At the moment we do not do any locking.
	295	*/
	296	/* ARGSUSED */
	297	fifo_lock(vp)
	298	struct vnode *vp;
	299	{
	300
	301	return (0);
	302	}
	303
	304	/* ARGSUSED */
	305	fifo_unlock(vp)
	306	struct vnode *vp;
	307	{
	308
	309	return (0);
	310	}
	311
	312	/*
	313	* Device close routine
	314	*/
	315	/* ARGSUSED */
81b4c293	316	fifo_close(vp, fflag, cred, p)
cc6b488e KM	317	register struct vnode *vp;
	318	int fflag;
	319	struct ucred *cred;
81b4c293	320	struct proc *p;
cc6b488e KM	321	{
	322	register struct fifoinfo *fip = vp->v_fifoinfo;
	323	int error1, error2;
	324
	325	if (fflag & FWRITE) {
	326	fip->fi_writers--;
	327	if (fip->fi_writers == 0)
	328	socantrcvmore(fip->fi_readsock);
	329	} else {
	330	fip->fi_readers--;
	331	if (fip->fi_readers == 0)
	332	socantsendmore(fip->fi_writesock);
	333	}
	334	if (vp->v_usecount > 1)
	335	return (0);
	336	error1 = soclose(fip->fi_readsock);
	337	error2 = soclose(fip->fi_writesock);
	338	FREE(fip, M_VNODE);
	339	vp->v_fifoinfo = NULL;
	340	if (error1)
	341	return (error1);
	342	return (error2);
	343	}
	344
	345	/*
	346	* Print out the contents of a fifo vnode.
	347	*/
	348	fifo_print(vp)
	349	struct vnode *vp;
	350	{
	351
	352	printf("tag VT_NON");
	353	fifo_printinfo(vp);
	354	printf("\n");
	355	}
	356
	357	/*
	358	* Print out internal contents of a fifo vnode.
	359	*/
	360	fifo_printinfo(vp)
	361	struct vnode *vp;
	362	{
	363	register struct fifoinfo *fip = vp->v_fifoinfo;
	364
	365	printf(", fifo with %d readers and %d writers",
	366	fip->fi_readers, fip->fi_writers);
	367	}
	368
	369	/*
	370	* Fifo failed operation
	371	*/
	372	fifo_ebadf()
	373	{
	374
	375	return (EBADF);
	376	}
	377
a4128336 KM	378	/*
	379	* Fifo advisory byte-level locks.
	380	*/
81b4c293	381	/* ARGSUSED */
a4128336 KM	382	fifo_advlock(vp, id, op, fl, flags)
	383	struct vnode *vp;
	384	caddr_t id;
	385	int op;
	386	struct flock *fl;
	387	int flags;
	388	{
	389
	390	return (EOPNOTSUPP);
	391	}
	392
cc6b488e KM	393	/*
	394	* Fifo bad operation
	395	*/
	396	fifo_badop()
	397	{
	398
	399	panic("fifo_badop called");
	400	/* NOTREACHED */
	401	}