[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	7.13 (Berkeley) %G%
 */

#include "param.h"
#include "proc.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;
};

int (**fifo_vnodeop_p)();
struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, fifo_lookup },		/* lookup */
	{ &vop_create_desc, fifo_create },		/* create */
	{ &vop_mknod_desc, fifo_mknod },		/* mknod */
	{ &vop_open_desc, fifo_open },		/* open */
	{ &vop_close_desc, fifo_close },		/* close */
	{ &vop_access_desc, fifo_access },		/* access */
	{ &vop_getattr_desc, fifo_getattr },		/* getattr */
	{ &vop_setattr_desc, fifo_setattr },		/* setattr */
	{ &vop_read_desc, fifo_read },		/* read */
	{ &vop_write_desc, fifo_write },		/* write */
	{ &vop_ioctl_desc, fifo_ioctl },		/* ioctl */
	{ &vop_select_desc, fifo_select },		/* select */
	{ &vop_mmap_desc, fifo_mmap },		/* mmap */
	{ &vop_fsync_desc, fifo_fsync },		/* fsync */
	{ &vop_seek_desc, fifo_seek },		/* seek */
	{ &vop_remove_desc, fifo_remove },		/* remove */
	{ &vop_link_desc, fifo_link },		/* link */
	{ &vop_rename_desc, fifo_rename },		/* rename */
	{ &vop_mkdir_desc, fifo_mkdir },		/* mkdir */
	{ &vop_rmdir_desc, fifo_rmdir },		/* rmdir */
	{ &vop_symlink_desc, fifo_symlink },		/* symlink */
	{ &vop_readdir_desc, fifo_readdir },		/* readdir */
	{ &vop_readlink_desc, fifo_readlink },		/* readlink */
	{ &vop_abortop_desc, fifo_abortop },		/* abortop */
	{ &vop_inactive_desc, fifo_inactive },		/* inactive */
	{ &vop_reclaim_desc, fifo_reclaim },		/* reclaim */
	{ &vop_lock_desc, fifo_lock },		/* lock */
	{ &vop_unlock_desc, fifo_unlock },		/* unlock */
	{ &vop_bmap_desc, fifo_bmap },		/* bmap */
	{ &vop_strategy_desc, fifo_strategy },		/* strategy */
	{ &vop_print_desc, fifo_print },		/* print */
	{ &vop_islocked_desc, fifo_islocked },		/* islocked */
	{ &vop_advlock_desc, fifo_advlock },		/* advlock */
	{ &vop_blkatoff_desc, fifo_blkatoff },		/* blkatoff */
	{ &vop_vget_desc, fifo_vget },		/* vget */
	{ &vop_valloc_desc, fifo_valloc },		/* valloc */
	{ &vop_vfree_desc, fifo_vfree },		/* vfree */
	{ &vop_truncate_desc, fifo_truncate },		/* truncate */
	{ &vop_update_desc, fifo_update },		/* update */
	{ &vop_bwrite_desc, fifo_bwrite },		/* bwrite */
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc fifo_vnodeop_opv_desc =
	{ &fifo_vnodeop_p, fifo_vnodeop_entries };

/*
 * Trivial lookup routine that always fails.
 */
/* ARGSUSED */
fifo_lookup (ap)
	struct vop_lookup_args *ap;
#define dvp (ap->a_dvp)
#define vpp (ap->a_vpp)
#define cnp (ap->a_cnp)
{
	
	*vpp = NULL;
	return (ENOTDIR);
}
#undef dvp
#undef vpp
#undef cnp

/*
 * Open called to set up a new instance of a fifo or
 * to find an active instance of a fifo.
 */
/* ARGSUSED */
fifo_open (ap)
	struct vop_open_args *ap;
#define vp (ap->a_vp)
#define mode (ap->a_mode)
#define cred (ap->a_cred)
#define p (ap->a_p)
{
	USES_VOP_CLOSE;
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	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);
		}
		fip->fi_readers = fip->fi_writers = 0;
		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,
				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, openstr, 0);
				VOP_LOCK(vp);
				if (error)
					break;
			}
		}
	}
	if (error)
		VOP_CLOSE(vp, mode, cred, p);
	return (error);
}
#undef vp
#undef mode
#undef cred
#undef p

/*
 * Vnode op for read
 */
/* ARGSUSED */
fifo_read (ap)
	struct vop_read_args *ap;
#define vp (ap->a_vp)
#define uio (ap->a_uio)
#define ioflag (ap->a_ioflag)
#define cred (ap->a_cred)
{
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	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);
}
#undef vp
#undef uio
#undef ioflag
#undef cred

/*
 * Vnode op for write
 */
/* ARGSUSED */
fifo_write (ap)
	struct vop_write_args *ap;
#define vp (ap->a_vp)
#define uio (ap->a_uio)
#define ioflag (ap->a_ioflag)
#define cred (ap->a_cred)
{
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	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);
}
#undef vp
#undef uio
#undef ioflag
#undef cred

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
fifo_ioctl (ap)
	struct vop_ioctl_args *ap;
#define vp (ap->a_vp)
#define com (ap->a_command)
#define data (ap->a_data)
#define fflag (ap->a_fflag)
#define cred (ap->a_cred)
#define p (ap->a_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));
}
#undef vp
#undef com
#undef data
#undef fflag
#undef cred
#undef p

/* ARGSUSED */
fifo_select (ap)
	struct vop_select_args *ap;
#define vp (ap->a_vp)
#define which (ap->a_which)
#define fflag (ap->a_fflags)
#define cred (ap->a_cred)
#define p (ap->a_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));
}
#undef vp
#undef which
#undef fflag
#undef cred
#undef p

/*
 * This is a noop, simply returning what one has been given.
 */
fifo_bmap (ap)
	struct vop_bmap_args *ap;
#define vp (ap->a_vp)
#define bn (ap->a_bn)
#define vpp (ap->a_vpp)
#define bnp (ap->a_bnp)
{

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

/*
 * At the moment we do not do any locking.
 */
/* ARGSUSED */
fifo_lock (ap)
	struct vop_lock_args *ap;
#define vp (ap->a_vp)
{

	return (0);
}
#undef vp

/* ARGSUSED */
fifo_unlock (ap)
	struct vop_unlock_args *ap;
#define vp (ap->a_vp)
{

	return (0);
}
#undef vp

/*
 * Device close routine
 */
/* ARGSUSED */
fifo_close (ap)
	struct vop_close_args *ap;
#define vp (ap->a_vp)
#define fflag (ap->a_fflag)
#define cred (ap->a_cred)
#define p (ap->a_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);
}
#undef vp
#undef fflag
#undef cred
#undef p

/*
 * Print out the contents of a fifo vnode.
 */
fifo_print (ap)
	struct vop_print_args *ap;
#define vp (ap->a_vp)
{

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

/*
 * 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 (ap)
	struct vop_advlock_args *ap;
#define vp (ap->a_vp)
#define id (ap->a_id)
#define op (ap->a_op)
#define fl (ap->a_fl)
#define flags (ap->a_flags)
{

	return (EOPNOTSUPP);
}
#undef vp
#undef id
#undef op
#undef fl
#undef flags

/*
 * 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	*
ea67b335	7	* @(#)fifo_vnops.c 7.13 (Berkeley) %G%
cc6b488e KM	8	*/
	9
	10	#include "param.h"
063b2136	11	#include "proc.h"
cc6b488e KM	12	#include "time.h"
	13	#include "namei.h"
	14	#include "vnode.h"
	15	#include "socket.h"
	16	#include "socketvar.h"
	17	#include "stat.h"
8429d022	18	#include "systm.h"
cc6b488e KM	19	#include "ioctl.h"
cc6b488e KM	20	#include "file.h"
81b4c293	21	#include "fifo.h"
cc6b488e KM	22	#include "errno.h"
	23	#include "malloc.h"
	24
	25	/*
	26	* This structure is associated with the FIFO vnode and stores
	27	* the state associated with the FIFO.
	28	*/
	29	struct fifoinfo {
	30	struct socket *fi_readsock;
	31	struct socket *fi_writesock;
	32	long fi_readers;
	33	long fi_writers;
	34	};
	35
9342689a JH	36	int (**fifo_vnodeop_p)();
	37	struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
	38	{ &vop_default_desc, vn_default_error },
	39	{ &vop_lookup_desc, fifo_lookup }, /* lookup */
	40	{ &vop_create_desc, fifo_create }, /* create */
	41	{ &vop_mknod_desc, fifo_mknod }, /* mknod */
	42	{ &vop_open_desc, fifo_open }, /* open */
	43	{ &vop_close_desc, fifo_close }, /* close */
	44	{ &vop_access_desc, fifo_access }, /* access */
	45	{ &vop_getattr_desc, fifo_getattr }, /* getattr */
	46	{ &vop_setattr_desc, fifo_setattr }, /* setattr */
	47	{ &vop_read_desc, fifo_read }, /* read */
	48	{ &vop_write_desc, fifo_write }, /* write */
	49	{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
	50	{ &vop_select_desc, fifo_select }, /* select */
	51	{ &vop_mmap_desc, fifo_mmap }, /* mmap */
	52	{ &vop_fsync_desc, fifo_fsync }, /* fsync */
	53	{ &vop_seek_desc, fifo_seek }, /* seek */
	54	{ &vop_remove_desc, fifo_remove }, /* remove */
	55	{ &vop_link_desc, fifo_link }, /* link */
	56	{ &vop_rename_desc, fifo_rename }, /* rename */
	57	{ &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
	58	{ &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
	59	{ &vop_symlink_desc, fifo_symlink }, /* symlink */
	60	{ &vop_readdir_desc, fifo_readdir }, /* readdir */
	61	{ &vop_readlink_desc, fifo_readlink }, /* readlink */
	62	{ &vop_abortop_desc, fifo_abortop }, /* abortop */
	63	{ &vop_inactive_desc, fifo_inactive }, /* inactive */
	64	{ &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
	65	{ &vop_lock_desc, fifo_lock }, /* lock */
	66	{ &vop_unlock_desc, fifo_unlock }, /* unlock */
	67	{ &vop_bmap_desc, fifo_bmap }, /* bmap */
	68	{ &vop_strategy_desc, fifo_strategy }, /* strategy */
	69	{ &vop_print_desc, fifo_print }, /* print */
	70	{ &vop_islocked_desc, fifo_islocked }, /* islocked */
	71	{ &vop_advlock_desc, fifo_advlock }, /* advlock */
	72	{ &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */
	73	{ &vop_vget_desc, fifo_vget }, /* vget */
	74	{ &vop_valloc_desc, fifo_valloc }, /* valloc */
	75	{ &vop_vfree_desc, fifo_vfree }, /* vfree */
	76	{ &vop_truncate_desc, fifo_truncate }, /* truncate */
	77	{ &vop_update_desc, fifo_update }, /* update */
	78	{ &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
	79	{ (struct vnodeop_desc)NULL, (int()())NULL }
cc6b488e	80	};
9342689a JH	81	struct vnodeopv_desc fifo_vnodeop_opv_desc =
9342689a JH	82	{ &fifo_vnodeop_p, fifo_vnodeop_entries };
cc6b488e KM	83
	84	/*
	85	* Trivial lookup routine that always fails.
	86	*/
81b4c293	87	/* ARGSUSED */
9342689a JH	88	fifo_lookup (ap)
	89	struct vop_lookup_args *ap;
	90	#define dvp (ap->a_dvp)
	91	#define vpp (ap->a_vpp)
	92	#define cnp (ap->a_cnp)
cc6b488e	93	{
085e9ab7 JH	94
085e9ab7 JH	95	*vpp = NULL;
cc6b488e KM	96	return (ENOTDIR);
cc6b488e KM	97	}
9342689a JH	98	#undef dvp
	99	#undef vpp
	100	#undef cnp
cc6b488e KM	101
	102	/*
	103	* Open called to set up a new instance of a fifo or
	104	* to find an active instance of a fifo.
	105	*/
	106	/* ARGSUSED */
9342689a JH	107	fifo_open (ap)
	108	struct vop_open_args *ap;
	109	#define vp (ap->a_vp)
	110	#define mode (ap->a_mode)
	111	#define cred (ap->a_cred)
	112	#define p (ap->a_p)
cc6b488e	113	{
9342689a JH	114	USES_VOP_CLOSE;
	115	USES_VOP_LOCK;
	116	USES_VOP_UNLOCK;
cc6b488e KM	117	register struct fifoinfo *fip;
	118	struct socket rso, wso;
	119	int error;
bcc829cc	120	static char openstr[] = "fifo";
cc6b488e KM	121
	122	if ((mode & (FREAD\|FWRITE)) == (FREAD\|FWRITE))
	123	return (EINVAL);
	124	if ((fip = vp->v_fifoinfo) == NULL) {
	125	MALLOC(fip, struct fifoinfo , sizeof(fip), M_VNODE, M_WAITOK);
	126	vp->v_fifoinfo = fip;
ed89f575 KM	127	if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
	128	free(fip, M_VNODE);
	129	vp->v_fifoinfo = NULL;
cc6b488e	130	return (error);
ed89f575	131	}
cc6b488e KM	132	fip->fi_readsock = rso;
	133	if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
	134	(void)soclose(rso);
ed89f575 KM	135	free(fip, M_VNODE);
ed89f575 KM	136	vp->v_fifoinfo = NULL;
cc6b488e KM	137	return (error);
	138	}
	139	fip->fi_writesock = wso;
	140	if (error = unp_connect2(wso, rso)) {
	141	(void)soclose(wso);
	142	(void)soclose(rso);
ed89f575 KM	143	free(fip, M_VNODE);
ed89f575 KM	144	vp->v_fifoinfo = NULL;
cc6b488e KM	145	return (error);
cc6b488e KM	146	}
80c4c463	147	fip->fi_readers = fip->fi_writers = 0;
cc6b488e KM	148	wso->so_state \|= SS_CANTRCVMORE;
	149	rso->so_state \|= SS_CANTSENDMORE;
	150	}
	151	error = 0;
	152	if (mode & FREAD) {
	153	fip->fi_readers++;
	154	if (fip->fi_readers == 1) {
	155	fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
	156	if (fip->fi_writers > 0)
	157	wakeup((caddr_t)&fip->fi_writers);
	158	}
	159	if (mode & O_NONBLOCK)
	160	return (0);
80c4c463 KM	161	while (fip->fi_writers == 0) {
	162	VOP_UNLOCK(vp);
	163	error = tsleep((caddr_t)&fip->fi_readers, PSOCK,
	164	openstr, 0);
	165	VOP_LOCK(vp);
	166	if (error)
cc6b488e	167	break;
80c4c463	168	}
cc6b488e KM	169	} else {
	170	fip->fi_writers++;
	171	if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) {
	172	error = ENXIO;
	173	} else {
	174	if (fip->fi_writers == 1) {
	175	fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
	176	if (fip->fi_readers > 0)
	177	wakeup((caddr_t)&fip->fi_readers);
	178	}
80c4c463 KM	179	while (fip->fi_readers == 0) {
	180	VOP_UNLOCK(vp);
	181	error = tsleep((caddr_t)&fip->fi_writers,
	182	PSOCK, openstr, 0);
	183	VOP_LOCK(vp);
	184	if (error)
cc6b488e	185	break;
80c4c463	186	}
cc6b488e KM	187	}
	188	}
	189	if (error)
9342689a	190	VOP_CLOSE(vp, mode, cred, p);
cc6b488e KM	191	return (error);
cc6b488e KM	192	}
9342689a JH	193	#undef vp
	194	#undef mode
	195	#undef cred
	196	#undef p
cc6b488e KM	197
	198	/*
	199	* Vnode op for read
	200	*/
	201	/* ARGSUSED */
9342689a JH	202	fifo_read (ap)
	203	struct vop_read_args *ap;
	204	#define vp (ap->a_vp)
	205	#define uio (ap->a_uio)
	206	#define ioflag (ap->a_ioflag)
	207	#define cred (ap->a_cred)
cc6b488e	208	{
9342689a JH	209	USES_VOP_LOCK;
9342689a JH	210	USES_VOP_UNLOCK;
cc6b488e KM	211	register struct socket *rso = vp->v_fifoinfo->fi_readsock;
	212	int error, startresid;
	213
81b4c293	214	#ifdef DIAGNOSTIC
cc6b488e KM	215	if (uio->uio_rw != UIO_READ)
cc6b488e KM	216	panic("fifo_read mode");
81b4c293	217	#endif
cc6b488e KM	218	if (uio->uio_resid == 0)
	219	return (0);
	220	if (ioflag & IO_NDELAY)
	221	rso->so_state \|= SS_NBIO;
	222	startresid = uio->uio_resid;
	223	VOP_UNLOCK(vp);
	224	error = soreceive(rso, (struct mbuf *)0, uio, (int )0,
	225	(struct mbuf )0, (struct mbuf )0);
	226	VOP_LOCK(vp);
	227	/*
	228	* Clear EOF indication after first such return.
	229	*/
	230	if (uio->uio_resid == startresid)
	231	rso->so_state &= ~SS_CANTRCVMORE;
	232	if (ioflag & IO_NDELAY)
	233	rso->so_state &= ~SS_NBIO;
	234	return (error);
	235	}
9342689a JH	236	#undef vp
	237	#undef uio
	238	#undef ioflag
	239	#undef cred
cc6b488e KM	240
	241	/*
	242	* Vnode op for write
	243	*/
	244	/* ARGSUSED */
9342689a JH	245	fifo_write (ap)
	246	struct vop_write_args *ap;
	247	#define vp (ap->a_vp)
	248	#define uio (ap->a_uio)
	249	#define ioflag (ap->a_ioflag)
	250	#define cred (ap->a_cred)
cc6b488e	251	{
9342689a JH	252	USES_VOP_LOCK;
9342689a JH	253	USES_VOP_UNLOCK;
cc6b488e KM	254	struct socket *wso = vp->v_fifoinfo->fi_writesock;
	255	int error;
	256
81b4c293	257	#ifdef DIAGNOSTIC
cc6b488e KM	258	if (uio->uio_rw != UIO_WRITE)
cc6b488e KM	259	panic("fifo_write mode");
81b4c293	260	#endif
cc6b488e KM	261	if (ioflag & IO_NDELAY)
	262	wso->so_state \|= SS_NBIO;
	263	VOP_UNLOCK(vp);
4032098c	264	error = sosend(wso, (struct mbuf )0, uio, 0, (struct mbuf )0, 0);
cc6b488e KM	265	VOP_LOCK(vp);
	266	if (ioflag & IO_NDELAY)
	267	wso->so_state &= ~SS_NBIO;
	268	return (error);
	269	}
9342689a JH	270	#undef vp
	271	#undef uio
	272	#undef ioflag
	273	#undef cred
cc6b488e KM	274
	275	/*
	276	* Device ioctl operation.
	277	*/
	278	/* ARGSUSED */
9342689a JH	279	fifo_ioctl (ap)
	280	struct vop_ioctl_args *ap;
	281	#define vp (ap->a_vp)
	282	#define com (ap->a_command)
	283	#define data (ap->a_data)
	284	#define fflag (ap->a_fflag)
	285	#define cred (ap->a_cred)
	286	#define p (ap->a_p)
cc6b488e KM	287	{
	288	struct file filetmp;
	289	int error;
	290
	291	if (com == FIONBIO)
	292	return (0);
	293	if (fflag & FREAD)
	294	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	295	else
	296	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
81b4c293	297	return (soo_ioctl(&filetmp, com, data, p));
cc6b488e	298	}
9342689a JH	299	#undef vp
	300	#undef com
	301	#undef data
	302	#undef fflag
	303	#undef cred
	304	#undef p
cc6b488e KM	305
cc6b488e KM	306	/* ARGSUSED */
9342689a JH	307	fifo_select (ap)
	308	struct vop_select_args *ap;
	309	#define vp (ap->a_vp)
	310	#define which (ap->a_which)
	311	#define fflag (ap->a_fflags)
	312	#define cred (ap->a_cred)
	313	#define p (ap->a_p)
cc6b488e KM	314	{
	315	struct file filetmp;
	316	int error;
	317
	318	if (fflag & FREAD)
	319	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
	320	else
	321	filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
81b4c293	322	return (soo_select(&filetmp, which, p));
cc6b488e	323	}
9342689a JH	324	#undef vp
	325	#undef which
	326	#undef fflag
	327	#undef cred
	328	#undef p
cc6b488e KM	329
	330	/*
	331	* This is a noop, simply returning what one has been given.
	332	*/
9342689a JH	333	fifo_bmap (ap)
	334	struct vop_bmap_args *ap;
	335	#define vp (ap->a_vp)
	336	#define bn (ap->a_bn)
	337	#define vpp (ap->a_vpp)
	338	#define bnp (ap->a_bnp)
cc6b488e KM	339	{
	340
	341	if (vpp != NULL)
	342	*vpp = vp;
	343	if (bnp != NULL)
	344	*bnp = bn;
	345	return (0);
	346	}
9342689a JH	347	#undef vp
	348	#undef bn
	349	#undef vpp
	350	#undef bnp
cc6b488e KM	351
	352	/*
	353	* At the moment we do not do any locking.
	354	*/
	355	/* ARGSUSED */
9342689a JH	356	fifo_lock (ap)
	357	struct vop_lock_args *ap;
	358	#define vp (ap->a_vp)
cc6b488e KM	359	{
	360
	361	return (0);
	362	}
9342689a	363	#undef vp
cc6b488e KM	364
cc6b488e KM	365	/* ARGSUSED */
9342689a JH	366	fifo_unlock (ap)
	367	struct vop_unlock_args *ap;
	368	#define vp (ap->a_vp)
cc6b488e KM	369	{
	370
	371	return (0);
	372	}
9342689a	373	#undef vp
cc6b488e KM	374
	375	/*
	376	* Device close routine
	377	*/
	378	/* ARGSUSED */
9342689a JH	379	fifo_close (ap)
	380	struct vop_close_args *ap;
	381	#define vp (ap->a_vp)
	382	#define fflag (ap->a_fflag)
	383	#define cred (ap->a_cred)
	384	#define p (ap->a_p)
cc6b488e KM	385	{
	386	register struct fifoinfo *fip = vp->v_fifoinfo;
	387	int error1, error2;
	388
	389	if (fflag & FWRITE) {
	390	fip->fi_writers--;
	391	if (fip->fi_writers == 0)
	392	socantrcvmore(fip->fi_readsock);
	393	} else {
	394	fip->fi_readers--;
	395	if (fip->fi_readers == 0)
	396	socantsendmore(fip->fi_writesock);
	397	}
	398	if (vp->v_usecount > 1)
	399	return (0);
	400	error1 = soclose(fip->fi_readsock);
	401	error2 = soclose(fip->fi_writesock);
	402	FREE(fip, M_VNODE);
	403	vp->v_fifoinfo = NULL;
	404	if (error1)
	405	return (error1);
	406	return (error2);
	407	}
9342689a JH	408	#undef vp
	409	#undef fflag
	410	#undef cred
	411	#undef p
cc6b488e KM	412
	413	/*
	414	* Print out the contents of a fifo vnode.
	415	*/
9342689a JH	416	fifo_print (ap)
	417	struct vop_print_args *ap;
	418	#define vp (ap->a_vp)
cc6b488e KM	419	{
	420
	421	printf("tag VT_NON");
	422	fifo_printinfo(vp);
	423	printf("\n");
	424	}
9342689a	425	#undef vp
cc6b488e KM	426
	427	/*
	428	* Print out internal contents of a fifo vnode.
	429	*/
	430	fifo_printinfo(vp)
	431	struct vnode *vp;
	432	{
	433	register struct fifoinfo *fip = vp->v_fifoinfo;
	434
	435	printf(", fifo with %d readers and %d writers",
	436	fip->fi_readers, fip->fi_writers);
	437	}
	438
	439	/*
	440	* Fifo failed operation
	441	*/
	442	fifo_ebadf()
	443	{
	444
	445	return (EBADF);
	446	}
	447
a4128336 KM	448	/*
	449	* Fifo advisory byte-level locks.
	450	*/
81b4c293	451	/* ARGSUSED */
9342689a JH	452	fifo_advlock (ap)
	453	struct vop_advlock_args *ap;
	454	#define vp (ap->a_vp)
	455	#define id (ap->a_id)
	456	#define op (ap->a_op)
	457	#define fl (ap->a_fl)
	458	#define flags (ap->a_flags)
a4128336 KM	459	{
	460
	461	return (EOPNOTSUPP);
	462	}
9342689a JH	463	#undef vp
	464	#undef id
	465	#undef op
	466	#undef fl
	467	#undef flags
a4128336	468
cc6b488e KM	469	/*
	470	* Fifo bad operation
	471	*/
	472	fifo_badop()
	473	{
	474
	475	panic("fifo_badop called");
	476	/* NOTREACHED */
	477	}