[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	7.15 (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;
{
	
	*ap->a_vpp = 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 (ap)
	struct vop_open_args *ap;
{
	USES_VOP_CLOSE;
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	register struct vnode *vp = ap->a_vp;
	register struct fifoinfo *fip;
	struct socket *rso, *wso;
	int error;
	static char openstr[] = "fifo";

	if ((ap->a_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 (ap->a_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 (ap->a_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 && (ap->a_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, ap->a_mode, ap->a_cred, ap->a_p);
	return (error);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
fifo_read (ap)
	struct vop_read_args *ap;
{
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	register struct uio *uio = ap->a_uio;
	register struct socket *rso = ap->a_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 (ap->a_ioflag & IO_NDELAY)
		rso->so_state |= SS_NBIO;
	startresid = uio->uio_resid;
	VOP_UNLOCK(ap->a_vp);
	error = soreceive(rso, (struct mbuf **)0, uio, (int *)0,
		(struct mbuf **)0, (struct mbuf **)0);
	VOP_LOCK(ap->a_vp);
	/*
	 * Clear EOF indication after first such return.
	 */
	if (uio->uio_resid == startresid)
		rso->so_state &= ~SS_CANTRCVMORE;
	if (ap->a_ioflag & IO_NDELAY)
		rso->so_state &= ~SS_NBIO;
	return (error);
}

/*
 * Vnode op for write
 */
/* ARGSUSED */
fifo_write (ap)
	struct vop_write_args *ap;
{
	USES_VOP_LOCK;
	USES_VOP_UNLOCK;
	struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
	int error;

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

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
fifo_ioctl (ap)
	struct vop_ioctl_args *ap;
{
	struct file filetmp;
	int error;

	if (ap->a_command == FIONBIO)
		return (0);
	if (ap->a_fflag & FREAD)
		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
	else
		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
	return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p));
}

/* ARGSUSED */
fifo_select (ap)
	struct vop_select_args *ap;
{
	struct file filetmp;
	int error;

	if (ap->a_fflags & FREAD)
		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
	else
		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
	return (soo_select(&filetmp, ap->a_which, ap->a_p));
}

/*
 * This is a noop, simply returning what one has been given.
 */
fifo_bmap (ap)
	struct vop_bmap_args *ap;
{

	if (ap->a_vpp != NULL)
		*ap->a_vpp = ap->a_vp;
	if (ap->a_bnp != NULL)
		*ap->a_bnp = ap->a_bn;
	return (0);
}

/*
 * At the moment we do not do any locking.
 */
/* ARGSUSED */
fifo_lock (ap)
	struct vop_lock_args *ap;
{

	return (0);
}

/* ARGSUSED */
fifo_unlock (ap)
	struct vop_unlock_args *ap;
{

	return (0);
}

/*
 * Device close routine
 */
/* ARGSUSED */
fifo_close (ap)
	struct vop_close_args *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct fifoinfo *fip = vp->v_fifoinfo;
	int error1, error2;

	if (ap->a_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 (ap)
	struct vop_print_args *ap;
{

	printf("tag VT_NON");
	fifo_printinfo(ap->a_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 (ap)
	struct vop_advlock_args *ap;
{

	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	*
406c9a0d	7	* @(#)fifo_vnops.c 7.15 (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)
9342689a JH	89	struct vop_lookup_args *ap;
cc6b488e	90	{
085e9ab7	91
e1b76915	92	*ap->a_vpp = NULL;
cc6b488e KM	93	return (ENOTDIR);
	94	}
	95
	96	/*
	97	* Open called to set up a new instance of a fifo or
	98	* to find an active instance of a fifo.
	99	*/
	100	/* ARGSUSED */
9342689a JH	101	fifo_open (ap)
9342689a JH	102	struct vop_open_args *ap;
cc6b488e	103	{
9342689a JH	104	USES_VOP_CLOSE;
	105	USES_VOP_LOCK;
	106	USES_VOP_UNLOCK;
406c9a0d	107	register struct vnode *vp = ap->a_vp;
cc6b488e KM	108	register struct fifoinfo *fip;
	109	struct socket rso, wso;
	110	int error;
bcc829cc	111	static char openstr[] = "fifo";
cc6b488e	112
e1b76915	113	if ((ap->a_mode & (FREAD\|FWRITE)) == (FREAD\|FWRITE))
cc6b488e	114	return (EINVAL);
406c9a0d	115	if ((fip = vp->v_fifoinfo) == NULL) {
cc6b488e	116	MALLOC(fip, struct fifoinfo , sizeof(fip), M_VNODE, M_WAITOK);
406c9a0d	117	vp->v_fifoinfo = fip;
ed89f575 KM	118	if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
ed89f575 KM	119	free(fip, M_VNODE);
406c9a0d	120	vp->v_fifoinfo = NULL;
cc6b488e	121	return (error);
ed89f575	122	}
cc6b488e KM	123	fip->fi_readsock = rso;
	124	if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
	125	(void)soclose(rso);
ed89f575	126	free(fip, M_VNODE);
406c9a0d	127	vp->v_fifoinfo = NULL;
cc6b488e KM	128	return (error);
	129	}
	130	fip->fi_writesock = wso;
	131	if (error = unp_connect2(wso, rso)) {
	132	(void)soclose(wso);
	133	(void)soclose(rso);
ed89f575	134	free(fip, M_VNODE);
406c9a0d	135	vp->v_fifoinfo = NULL;
cc6b488e KM	136	return (error);
cc6b488e KM	137	}
80c4c463	138	fip->fi_readers = fip->fi_writers = 0;
cc6b488e KM	139	wso->so_state \|= SS_CANTRCVMORE;
	140	rso->so_state \|= SS_CANTSENDMORE;
	141	}
	142	error = 0;
e1b76915	143	if (ap->a_mode & FREAD) {
cc6b488e KM	144	fip->fi_readers++;
	145	if (fip->fi_readers == 1) {
	146	fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
	147	if (fip->fi_writers > 0)
	148	wakeup((caddr_t)&fip->fi_writers);
	149	}
e1b76915	150	if (ap->a_mode & O_NONBLOCK)
cc6b488e	151	return (0);
80c4c463	152	while (fip->fi_writers == 0) {
406c9a0d	153	VOP_UNLOCK(vp);
80c4c463 KM	154	error = tsleep((caddr_t)&fip->fi_readers, PSOCK,
80c4c463 KM	155	openstr, 0);
406c9a0d	156	VOP_LOCK(vp);
80c4c463	157	if (error)
cc6b488e	158	break;
80c4c463	159	}
cc6b488e KM	160	} else {
cc6b488e KM	161	fip->fi_writers++;
e1b76915	162	if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) {
cc6b488e KM	163	error = ENXIO;
	164	} else {
	165	if (fip->fi_writers == 1) {
	166	fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
	167	if (fip->fi_readers > 0)
	168	wakeup((caddr_t)&fip->fi_readers);
	169	}
80c4c463	170	while (fip->fi_readers == 0) {
406c9a0d	171	VOP_UNLOCK(vp);
80c4c463 KM	172	error = tsleep((caddr_t)&fip->fi_writers,
80c4c463 KM	173	PSOCK, openstr, 0);
406c9a0d	174	VOP_LOCK(vp);
80c4c463	175	if (error)
cc6b488e	176	break;
80c4c463	177	}
cc6b488e KM	178	}
	179	}
	180	if (error)
406c9a0d	181	VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
cc6b488e KM	182	return (error);
	183	}
	184
	185	/*
	186	* Vnode op for read
	187	*/
	188	/* ARGSUSED */
9342689a JH	189	fifo_read (ap)
9342689a JH	190	struct vop_read_args *ap;
cc6b488e	191	{
9342689a JH	192	USES_VOP_LOCK;
9342689a JH	193	USES_VOP_UNLOCK;
406c9a0d	194	register struct uio *uio = ap->a_uio;
e1b76915	195	register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
cc6b488e KM	196	int error, startresid;
cc6b488e KM	197
81b4c293	198	#ifdef DIAGNOSTIC
406c9a0d	199	if (uio->uio_rw != UIO_READ)
cc6b488e	200	panic("fifo_read mode");
81b4c293	201	#endif
406c9a0d	202	if (uio->uio_resid == 0)
cc6b488e	203	return (0);
e1b76915	204	if (ap->a_ioflag & IO_NDELAY)
cc6b488e	205	rso->so_state \|= SS_NBIO;
406c9a0d	206	startresid = uio->uio_resid;
e1b76915	207	VOP_UNLOCK(ap->a_vp);
406c9a0d	208	error = soreceive(rso, (struct mbuf *)0, uio, (int )0,
cc6b488e	209	(struct mbuf )0, (struct mbuf )0);
e1b76915	210	VOP_LOCK(ap->a_vp);
cc6b488e KM	211	/*
	212	* Clear EOF indication after first such return.
	213	*/
406c9a0d	214	if (uio->uio_resid == startresid)
cc6b488e	215	rso->so_state &= ~SS_CANTRCVMORE;
e1b76915	216	if (ap->a_ioflag & IO_NDELAY)
cc6b488e KM	217	rso->so_state &= ~SS_NBIO;
	218	return (error);
	219	}
	220
	221	/*
	222	* Vnode op for write
	223	*/
	224	/* ARGSUSED */
9342689a JH	225	fifo_write (ap)
9342689a JH	226	struct vop_write_args *ap;
cc6b488e	227	{
9342689a JH	228	USES_VOP_LOCK;
9342689a JH	229	USES_VOP_UNLOCK;
e1b76915	230	struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
cc6b488e KM	231	int error;
cc6b488e KM	232
81b4c293	233	#ifdef DIAGNOSTIC
e1b76915	234	if (ap->a_uio->uio_rw != UIO_WRITE)
cc6b488e	235	panic("fifo_write mode");
81b4c293	236	#endif
e1b76915	237	if (ap->a_ioflag & IO_NDELAY)
cc6b488e	238	wso->so_state \|= SS_NBIO;
e1b76915 JH	239	VOP_UNLOCK(ap->a_vp);
	240	error = sosend(wso, (struct mbuf )0, ap->a_uio, 0, (struct mbuf )0, 0);
	241	VOP_LOCK(ap->a_vp);
	242	if (ap->a_ioflag & IO_NDELAY)
cc6b488e KM	243	wso->so_state &= ~SS_NBIO;
	244	return (error);
	245	}
	246
	247	/*
	248	* Device ioctl operation.
	249	*/
	250	/* ARGSUSED */
9342689a JH	251	fifo_ioctl (ap)
9342689a JH	252	struct vop_ioctl_args *ap;
cc6b488e KM	253	{
	254	struct file filetmp;
	255	int error;
	256
e1b76915	257	if (ap->a_command == FIONBIO)
cc6b488e	258	return (0);
e1b76915 JH	259	if (ap->a_fflag & FREAD)
e1b76915 JH	260	filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
cc6b488e	261	else
e1b76915 JH	262	filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
e1b76915 JH	263	return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p));
cc6b488e KM	264	}
	265
	266	/* ARGSUSED */
9342689a JH	267	fifo_select (ap)
9342689a JH	268	struct vop_select_args *ap;
cc6b488e KM	269	{
	270	struct file filetmp;
	271	int error;
	272
e1b76915 JH	273	if (ap->a_fflags & FREAD)
e1b76915 JH	274	filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
cc6b488e	275	else
e1b76915 JH	276	filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
e1b76915 JH	277	return (soo_select(&filetmp, ap->a_which, ap->a_p));
cc6b488e KM	278	}
	279
	280	/*
	281	* This is a noop, simply returning what one has been given.
	282	*/
9342689a JH	283	fifo_bmap (ap)
9342689a JH	284	struct vop_bmap_args *ap;
cc6b488e KM	285	{
cc6b488e KM	286
e1b76915 JH	287	if (ap->a_vpp != NULL)
	288	*ap->a_vpp = ap->a_vp;
	289	if (ap->a_bnp != NULL)
	290	*ap->a_bnp = ap->a_bn;
cc6b488e KM	291	return (0);
	292	}
	293
	294	/*
	295	* At the moment we do not do any locking.
	296	*/
	297	/* ARGSUSED */
9342689a JH	298	fifo_lock (ap)
9342689a JH	299	struct vop_lock_args *ap;
cc6b488e KM	300	{
	301
	302	return (0);
	303	}
	304
	305	/* ARGSUSED */
9342689a JH	306	fifo_unlock (ap)
9342689a JH	307	struct vop_unlock_args *ap;
cc6b488e KM	308	{
	309
	310	return (0);
	311	}
	312
	313	/*
	314	* Device close routine
	315	*/
	316	/* ARGSUSED */
9342689a JH	317	fifo_close (ap)
9342689a JH	318	struct vop_close_args *ap;
cc6b488e	319	{
406c9a0d JH	320	register struct vnode *vp = ap->a_vp;
406c9a0d JH	321	register struct fifoinfo *fip = vp->v_fifoinfo;
cc6b488e KM	322	int error1, error2;
cc6b488e KM	323
e1b76915	324	if (ap->a_fflag & FWRITE) {
cc6b488e KM	325	fip->fi_writers--;
	326	if (fip->fi_writers == 0)
	327	socantrcvmore(fip->fi_readsock);
	328	} else {
	329	fip->fi_readers--;
	330	if (fip->fi_readers == 0)
	331	socantsendmore(fip->fi_writesock);
	332	}
406c9a0d	333	if (vp->v_usecount > 1)
cc6b488e KM	334	return (0);
	335	error1 = soclose(fip->fi_readsock);
	336	error2 = soclose(fip->fi_writesock);
	337	FREE(fip, M_VNODE);
406c9a0d	338	vp->v_fifoinfo = NULL;
cc6b488e KM	339	if (error1)
	340	return (error1);
	341	return (error2);
	342	}
	343
	344	/*
	345	* Print out the contents of a fifo vnode.
	346	*/
9342689a JH	347	fifo_print (ap)
9342689a JH	348	struct vop_print_args *ap;
cc6b488e KM	349	{
	350
	351	printf("tag VT_NON");
e1b76915	352	fifo_printinfo(ap->a_vp);
cc6b488e KM	353	printf("\n");
	354	}
	355
	356	/*
	357	* Print out internal contents of a fifo vnode.
	358	*/
	359	fifo_printinfo(vp)
	360	struct vnode *vp;
	361	{
	362	register struct fifoinfo *fip = vp->v_fifoinfo;
	363
	364	printf(", fifo with %d readers and %d writers",
	365	fip->fi_readers, fip->fi_writers);
	366	}
	367
	368	/*
	369	* Fifo failed operation
	370	*/
	371	fifo_ebadf()
	372	{
	373
	374	return (EBADF);
	375	}
	376
a4128336 KM	377	/*
	378	* Fifo advisory byte-level locks.
	379	*/
81b4c293	380	/* ARGSUSED */
9342689a JH	381	fifo_advlock (ap)
9342689a JH	382	struct vop_advlock_args *ap;
a4128336 KM	383	{
	384
	385	return (EOPNOTSUPP);
	386	}
	387
cc6b488e KM	388	/*
	389	* Fifo bad operation
	390	*/
	391	fifo_badop()
	392	{
	393
	394	panic("fifo_badop called");
	395	/* NOTREACHED */
	396	}