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fifo_vnops.c revision 1.49
      1  1.49  jonathan /*	$NetBSD: fifo_vnops.c,v 1.49 2004/05/22 22:52:14 jonathan Exp $	*/
      2   1.9       cgd 
      3   1.1       cgd /*
      4  1.25      fvdl  * Copyright (c) 1990, 1993, 1995
      5   1.8   mycroft  *	The Regents of the University of California.  All rights reserved.
      6   1.1       cgd  *
      7   1.1       cgd  * Redistribution and use in source and binary forms, with or without
      8   1.1       cgd  * modification, are permitted provided that the following conditions
      9   1.1       cgd  * are met:
     10   1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     11   1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     12   1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13   1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     14   1.1       cgd  *    documentation and/or other materials provided with the distribution.
     15  1.42       agc  * 3. Neither the name of the University nor the names of its contributors
     16   1.1       cgd  *    may be used to endorse or promote products derived from this software
     17   1.1       cgd  *    without specific prior written permission.
     18   1.1       cgd  *
     19   1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20   1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21   1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22   1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23   1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24   1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25   1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26   1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27   1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28   1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29   1.1       cgd  * SUCH DAMAGE.
     30   1.1       cgd  *
     31  1.25      fvdl  *	@(#)fifo_vnops.c	8.10 (Berkeley) 5/27/95
     32   1.1       cgd  */
     33  1.32     lukem 
     34  1.32     lukem #include <sys/cdefs.h>
     35  1.49  jonathan __KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.49 2004/05/22 22:52:14 jonathan Exp $");
     36   1.1       cgd 
     37   1.6   mycroft #include <sys/param.h>
     38  1.25      fvdl #include <sys/systm.h>
     39   1.8   mycroft #include <sys/proc.h>
     40   1.6   mycroft #include <sys/time.h>
     41   1.6   mycroft #include <sys/namei.h>
     42   1.6   mycroft #include <sys/vnode.h>
     43   1.6   mycroft #include <sys/socket.h>
     44  1.45      matt #include <sys/protosw.h>
     45   1.6   mycroft #include <sys/socketvar.h>
     46   1.6   mycroft #include <sys/stat.h>
     47   1.6   mycroft #include <sys/ioctl.h>
     48   1.6   mycroft #include <sys/file.h>
     49   1.6   mycroft #include <sys/errno.h>
     50   1.6   mycroft #include <sys/malloc.h>
     51  1.17  christos #include <sys/un.h>
     52  1.20   mycroft #include <sys/poll.h>
     53  1.36  jdolecek #include <sys/event.h>
     54  1.19   mycroft 
     55   1.6   mycroft #include <miscfs/fifofs/fifo.h>
     56  1.19   mycroft #include <miscfs/genfs/genfs.h>
     57   1.1       cgd 
     58   1.1       cgd /*
     59   1.1       cgd  * This structure is associated with the FIFO vnode and stores
     60   1.1       cgd  * the state associated with the FIFO.
     61   1.1       cgd  */
     62   1.1       cgd struct fifoinfo {
     63   1.1       cgd 	struct socket	*fi_readsock;
     64   1.1       cgd 	struct socket	*fi_writesock;
     65  1.34       chs 	long		fi_opencount;
     66   1.1       cgd 	long		fi_readers;
     67   1.1       cgd 	long		fi_writers;
     68   1.1       cgd };
     69   1.1       cgd 
     70  1.17  christos int (**fifo_vnodeop_p) __P((void *));
     71  1.29  jdolecek const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
     72   1.8   mycroft 	{ &vop_default_desc, vn_default_error },
     73   1.8   mycroft 	{ &vop_lookup_desc, fifo_lookup },		/* lookup */
     74   1.8   mycroft 	{ &vop_create_desc, fifo_create },		/* create */
     75   1.8   mycroft 	{ &vop_mknod_desc, fifo_mknod },		/* mknod */
     76   1.8   mycroft 	{ &vop_open_desc, fifo_open },			/* open */
     77   1.8   mycroft 	{ &vop_close_desc, fifo_close },		/* close */
     78   1.8   mycroft 	{ &vop_access_desc, fifo_access },		/* access */
     79   1.8   mycroft 	{ &vop_getattr_desc, fifo_getattr },		/* getattr */
     80   1.8   mycroft 	{ &vop_setattr_desc, fifo_setattr },		/* setattr */
     81   1.8   mycroft 	{ &vop_read_desc, fifo_read },			/* read */
     82   1.8   mycroft 	{ &vop_write_desc, fifo_write },		/* write */
     83  1.13   mycroft 	{ &vop_lease_desc, fifo_lease_check },		/* lease */
     84   1.8   mycroft 	{ &vop_ioctl_desc, fifo_ioctl },		/* ioctl */
     85  1.20   mycroft 	{ &vop_poll_desc, fifo_poll },			/* poll */
     86  1.36  jdolecek 	{ &vop_kqfilter_desc, fifo_kqfilter },		/* kqfilter */
     87  1.25      fvdl 	{ &vop_revoke_desc, fifo_revoke },		/* revoke */
     88   1.8   mycroft 	{ &vop_mmap_desc, fifo_mmap },			/* mmap */
     89   1.8   mycroft 	{ &vop_fsync_desc, fifo_fsync },		/* fsync */
     90   1.8   mycroft 	{ &vop_seek_desc, fifo_seek },			/* seek */
     91   1.8   mycroft 	{ &vop_remove_desc, fifo_remove },		/* remove */
     92   1.8   mycroft 	{ &vop_link_desc, fifo_link },			/* link */
     93   1.8   mycroft 	{ &vop_rename_desc, fifo_rename },		/* rename */
     94   1.8   mycroft 	{ &vop_mkdir_desc, fifo_mkdir },		/* mkdir */
     95   1.8   mycroft 	{ &vop_rmdir_desc, fifo_rmdir },		/* rmdir */
     96   1.8   mycroft 	{ &vop_symlink_desc, fifo_symlink },		/* symlink */
     97   1.8   mycroft 	{ &vop_readdir_desc, fifo_readdir },		/* readdir */
     98   1.8   mycroft 	{ &vop_readlink_desc, fifo_readlink },		/* readlink */
     99   1.8   mycroft 	{ &vop_abortop_desc, fifo_abortop },		/* abortop */
    100   1.8   mycroft 	{ &vop_inactive_desc, fifo_inactive },		/* inactive */
    101   1.8   mycroft 	{ &vop_reclaim_desc, fifo_reclaim },		/* reclaim */
    102   1.8   mycroft 	{ &vop_lock_desc, fifo_lock },			/* lock */
    103   1.8   mycroft 	{ &vop_unlock_desc, fifo_unlock },		/* unlock */
    104   1.8   mycroft 	{ &vop_bmap_desc, fifo_bmap },			/* bmap */
    105   1.8   mycroft 	{ &vop_strategy_desc, fifo_strategy },		/* strategy */
    106   1.8   mycroft 	{ &vop_print_desc, fifo_print },		/* print */
    107   1.8   mycroft 	{ &vop_islocked_desc, fifo_islocked },		/* islocked */
    108   1.8   mycroft 	{ &vop_pathconf_desc, fifo_pathconf },		/* pathconf */
    109   1.8   mycroft 	{ &vop_advlock_desc, fifo_advlock },		/* advlock */
    110   1.8   mycroft 	{ &vop_blkatoff_desc, fifo_blkatoff },		/* blkatoff */
    111   1.8   mycroft 	{ &vop_valloc_desc, fifo_valloc },		/* valloc */
    112   1.8   mycroft 	{ &vop_vfree_desc, fifo_vfree },		/* vfree */
    113   1.8   mycroft 	{ &vop_truncate_desc, fifo_truncate },		/* truncate */
    114   1.8   mycroft 	{ &vop_update_desc, fifo_update },		/* update */
    115   1.8   mycroft 	{ &vop_bwrite_desc, fifo_bwrite },		/* bwrite */
    116  1.31  sommerfe 	{ &vop_putpages_desc, fifo_putpages }, 		/* putpages */
    117  1.17  christos 	{ (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL }
    118   1.1       cgd };
    119  1.29  jdolecek const struct vnodeopv_desc fifo_vnodeop_opv_desc =
    120   1.8   mycroft 	{ &fifo_vnodeop_p, fifo_vnodeop_entries };
    121   1.1       cgd 
    122   1.1       cgd /*
    123   1.1       cgd  * Trivial lookup routine that always fails.
    124   1.1       cgd  */
    125   1.1       cgd /* ARGSUSED */
    126  1.17  christos int
    127  1.30     lukem fifo_lookup(void *v)
    128  1.17  christos {
    129   1.8   mycroft 	struct vop_lookup_args /* {
    130  1.30     lukem 		struct vnode		*a_dvp;
    131  1.30     lukem 		struct vnode		**a_vpp;
    132  1.30     lukem 		struct componentname	*a_cnp;
    133  1.17  christos 	} */ *ap = v;
    134   1.8   mycroft 
    135   1.8   mycroft 	*ap->a_vpp = NULL;
    136   1.1       cgd 	return (ENOTDIR);
    137   1.1       cgd }
    138   1.1       cgd 
    139   1.1       cgd /*
    140   1.1       cgd  * Open called to set up a new instance of a fifo or
    141   1.1       cgd  * to find an active instance of a fifo.
    142   1.1       cgd  */
    143   1.1       cgd /* ARGSUSED */
    144  1.17  christos int
    145  1.30     lukem fifo_open(void *v)
    146  1.17  christos {
    147   1.8   mycroft 	struct vop_open_args /* {
    148  1.30     lukem 		struct vnode	*a_vp;
    149  1.30     lukem 		int		a_mode;
    150  1.30     lukem 		struct ucred	*a_cred;
    151  1.41      fvdl 		struct proc	*a_p;
    152  1.17  christos 	} */ *ap = v;
    153  1.30     lukem 	struct vnode	*vp;
    154  1.30     lukem 	struct fifoinfo	*fip;
    155  1.30     lukem 	struct proc	*p;
    156  1.30     lukem 	struct socket	*rso, *wso;
    157  1.30     lukem 	int		error;
    158   1.1       cgd 
    159  1.30     lukem 	vp = ap->a_vp;
    160  1.41      fvdl 	p = ap->a_p;
    161  1.30     lukem 
    162   1.1       cgd 	if ((fip = vp->v_fifoinfo) == NULL) {
    163   1.1       cgd 		MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
    164   1.1       cgd 		vp->v_fifoinfo = fip;
    165  1.49  jonathan 		error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, p);
    166  1.49  jonathan 		if (error != 0) {
    167   1.1       cgd 			free(fip, M_VNODE);
    168   1.1       cgd 			vp->v_fifoinfo = NULL;
    169   1.1       cgd 			return (error);
    170   1.1       cgd 		}
    171   1.1       cgd 		fip->fi_readsock = rso;
    172  1.49  jonathan 		error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, p);
    173  1.49  jonathan 		if (error != 0) {
    174   1.1       cgd 			(void)soclose(rso);
    175   1.1       cgd 			free(fip, M_VNODE);
    176   1.1       cgd 			vp->v_fifoinfo = NULL;
    177   1.1       cgd 			return (error);
    178   1.1       cgd 		}
    179   1.1       cgd 		fip->fi_writesock = wso;
    180  1.45      matt 		if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0) {
    181   1.1       cgd 			(void)soclose(wso);
    182   1.1       cgd 			(void)soclose(rso);
    183   1.1       cgd 			free(fip, M_VNODE);
    184   1.1       cgd 			vp->v_fifoinfo = NULL;
    185   1.1       cgd 			return (error);
    186   1.1       cgd 		}
    187   1.8   mycroft 		fip->fi_readers = fip->fi_writers = 0;
    188  1.34       chs 		fip->fi_opencount = 0;
    189   1.1       cgd 		wso->so_state |= SS_CANTRCVMORE;
    190   1.1       cgd 		rso->so_state |= SS_CANTSENDMORE;
    191   1.1       cgd 	}
    192  1.34       chs 	fip->fi_opencount++;
    193   1.8   mycroft 	if (ap->a_mode & FREAD) {
    194  1.16   mycroft 		if (fip->fi_readers++ == 0) {
    195   1.1       cgd 			fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
    196   1.1       cgd 			if (fip->fi_writers > 0)
    197  1.47       jrf 				wakeup(&fip->fi_writers);
    198   1.1       cgd 		}
    199  1.16   mycroft 	}
    200  1.16   mycroft 	if (ap->a_mode & FWRITE) {
    201  1.16   mycroft 		if (fip->fi_writers++ == 0) {
    202  1.16   mycroft 			fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
    203  1.16   mycroft 			if (fip->fi_readers > 0)
    204  1.47       jrf 				wakeup(&fip->fi_readers);
    205   1.2       cgd 		}
    206  1.16   mycroft 	}
    207  1.16   mycroft 	if (ap->a_mode & FREAD) {
    208  1.16   mycroft 		if (ap->a_mode & O_NONBLOCK) {
    209   1.1       cgd 		} else {
    210  1.39    martin 			while (!soreadable(fip->fi_readsock) && fip->fi_writers == 0) {
    211  1.25      fvdl 				VOP_UNLOCK(vp, 0);
    212  1.47       jrf 				error = tsleep(&fip->fi_readers,
    213  1.38  jdolecek 				    PCATCH | PSOCK, "fifor", 0);
    214  1.25      fvdl 				vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    215  1.16   mycroft 				if (error)
    216  1.16   mycroft 					goto bad;
    217   1.1       cgd 			}
    218  1.16   mycroft 		}
    219  1.16   mycroft 	}
    220  1.16   mycroft 	if (ap->a_mode & FWRITE) {
    221  1.16   mycroft 		if (ap->a_mode & O_NONBLOCK) {
    222  1.16   mycroft 			if (fip->fi_readers == 0) {
    223  1.16   mycroft 				error = ENXIO;
    224  1.16   mycroft 				goto bad;
    225  1.16   mycroft 			}
    226  1.16   mycroft 		} else {
    227   1.2       cgd 			while (fip->fi_readers == 0) {
    228  1.25      fvdl 				VOP_UNLOCK(vp, 0);
    229  1.47       jrf 				error = tsleep(&fip->fi_writers,
    230  1.38  jdolecek 				    PCATCH | PSOCK, "fifow", 0);
    231  1.25      fvdl 				vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    232   1.8   mycroft 				if (error)
    233  1.16   mycroft 					goto bad;
    234   1.2       cgd 			}
    235   1.1       cgd 		}
    236   1.1       cgd 	}
    237  1.16   mycroft 	return (0);
    238  1.30     lukem  bad:
    239  1.41      fvdl 	VOP_CLOSE(vp, ap->a_mode, ap->a_cred, p);
    240   1.1       cgd 	return (error);
    241   1.1       cgd }
    242   1.1       cgd 
    243   1.1       cgd /*
    244   1.1       cgd  * Vnode op for read
    245   1.1       cgd  */
    246   1.1       cgd /* ARGSUSED */
    247  1.17  christos int
    248  1.30     lukem fifo_read(void *v)
    249  1.17  christos {
    250   1.8   mycroft 	struct vop_read_args /* {
    251  1.30     lukem 		struct vnode	*a_vp;
    252  1.30     lukem 		struct uio	*a_uio;
    253  1.30     lukem 		int		a_ioflag;
    254  1.30     lukem 		struct ucred	*a_cred;
    255  1.17  christos 	} */ *ap = v;
    256  1.30     lukem 	struct uio	*uio;
    257  1.30     lukem 	struct socket	*rso;
    258  1.35   thorpej 	int		error;
    259  1.35   thorpej 	size_t		startresid;
    260   1.1       cgd 
    261  1.30     lukem 	uio = ap->a_uio;
    262  1.30     lukem 	rso = ap->a_vp->v_fifoinfo->fi_readsock;
    263   1.1       cgd #ifdef DIAGNOSTIC
    264   1.1       cgd 	if (uio->uio_rw != UIO_READ)
    265   1.1       cgd 		panic("fifo_read mode");
    266   1.1       cgd #endif
    267   1.1       cgd 	if (uio->uio_resid == 0)
    268   1.1       cgd 		return (0);
    269   1.8   mycroft 	if (ap->a_ioflag & IO_NDELAY)
    270   1.1       cgd 		rso->so_state |= SS_NBIO;
    271   1.1       cgd 	startresid = uio->uio_resid;
    272  1.25      fvdl 	VOP_UNLOCK(ap->a_vp, 0);
    273  1.27      matt 	error = (*rso->so_receive)(rso, (struct mbuf **)0, uio,
    274  1.27      matt 	    (struct mbuf **)0, (struct mbuf **)0, (int *)0);
    275  1.25      fvdl 	vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
    276   1.1       cgd 	/*
    277   1.1       cgd 	 * Clear EOF indication after first such return.
    278   1.1       cgd 	 */
    279   1.1       cgd 	if (uio->uio_resid == startresid)
    280   1.1       cgd 		rso->so_state &= ~SS_CANTRCVMORE;
    281  1.23    kleink 	if (ap->a_ioflag & IO_NDELAY) {
    282   1.1       cgd 		rso->so_state &= ~SS_NBIO;
    283  1.23    kleink 		if (error == EWOULDBLOCK &&
    284  1.23    kleink 		    ap->a_vp->v_fifoinfo->fi_writers == 0)
    285  1.23    kleink 			error = 0;
    286  1.23    kleink 	}
    287   1.1       cgd 	return (error);
    288   1.1       cgd }
    289   1.1       cgd 
    290   1.1       cgd /*
    291   1.1       cgd  * Vnode op for write
    292   1.1       cgd  */
    293   1.1       cgd /* ARGSUSED */
    294  1.17  christos int
    295  1.30     lukem fifo_write(void *v)
    296  1.17  christos {
    297   1.8   mycroft 	struct vop_write_args /* {
    298  1.30     lukem 		struct vnode	*a_vp;
    299  1.30     lukem 		struct uio	*a_uio;
    300  1.30     lukem 		int		a_ioflag;
    301  1.30     lukem 		struct ucred	*a_cred;
    302  1.17  christos 	} */ *ap = v;
    303  1.30     lukem 	struct socket	*wso;
    304  1.30     lukem 	int		error;
    305   1.1       cgd 
    306  1.30     lukem 	wso = ap->a_vp->v_fifoinfo->fi_writesock;
    307   1.1       cgd #ifdef DIAGNOSTIC
    308   1.8   mycroft 	if (ap->a_uio->uio_rw != UIO_WRITE)
    309   1.1       cgd 		panic("fifo_write mode");
    310   1.1       cgd #endif
    311   1.8   mycroft 	if (ap->a_ioflag & IO_NDELAY)
    312   1.1       cgd 		wso->so_state |= SS_NBIO;
    313  1.25      fvdl 	VOP_UNLOCK(ap->a_vp, 0);
    314  1.27      matt 	error = (*wso->so_send)(wso, (struct mbuf *)0, ap->a_uio, 0,
    315  1.49  jonathan 	    (struct mbuf *)0, 0, curproc /*XXX*/);
    316  1.25      fvdl 	vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
    317   1.8   mycroft 	if (ap->a_ioflag & IO_NDELAY)
    318   1.1       cgd 		wso->so_state &= ~SS_NBIO;
    319   1.1       cgd 	return (error);
    320   1.1       cgd }
    321   1.1       cgd 
    322   1.1       cgd /*
    323   1.1       cgd  * Device ioctl operation.
    324   1.1       cgd  */
    325   1.1       cgd /* ARGSUSED */
    326  1.17  christos int
    327  1.30     lukem fifo_ioctl(void *v)
    328  1.17  christos {
    329   1.8   mycroft 	struct vop_ioctl_args /* {
    330  1.30     lukem 		struct vnode	*a_vp;
    331  1.30     lukem 		u_long		a_command;
    332  1.48       jrf 		void		*a_data;
    333  1.30     lukem 		int		a_fflag;
    334  1.30     lukem 		struct ucred	*a_cred;
    335  1.41      fvdl 		struct proc	*a_p;
    336  1.17  christos 	} */ *ap = v;
    337  1.30     lukem 	struct file	filetmp;
    338  1.30     lukem 	int		error;
    339   1.1       cgd 
    340   1.8   mycroft 	if (ap->a_command == FIONBIO)
    341   1.1       cgd 		return (0);
    342  1.16   mycroft 	if (ap->a_fflag & FREAD) {
    343  1.48       jrf 		filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
    344  1.41      fvdl 		error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
    345  1.16   mycroft 		if (error)
    346  1.16   mycroft 			return (error);
    347  1.16   mycroft 	}
    348  1.16   mycroft 	if (ap->a_fflag & FWRITE) {
    349  1.48       jrf 		filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
    350  1.41      fvdl 		error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
    351  1.16   mycroft 		if (error)
    352  1.16   mycroft 			return (error);
    353  1.16   mycroft 	}
    354  1.16   mycroft 	return (0);
    355   1.1       cgd }
    356   1.1       cgd 
    357   1.1       cgd /* ARGSUSED */
    358  1.17  christos int
    359  1.30     lukem fifo_poll(void *v)
    360  1.17  christos {
    361  1.20   mycroft 	struct vop_poll_args /* {
    362  1.30     lukem 		struct vnode	*a_vp;
    363  1.30     lukem 		int		a_events;
    364  1.41      fvdl 		struct proc	*a_p;
    365  1.17  christos 	} */ *ap = v;
    366  1.30     lukem 	struct file	filetmp;
    367  1.30     lukem 	int		revents;
    368   1.1       cgd 
    369  1.30     lukem 	revents = 0;
    370  1.20   mycroft 	if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
    371  1.48       jrf 		filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
    372  1.20   mycroft 		if (filetmp.f_data)
    373  1.41      fvdl 			revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
    374  1.16   mycroft 	}
    375  1.20   mycroft 	if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
    376  1.48       jrf 		filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
    377  1.20   mycroft 		if (filetmp.f_data)
    378  1.41      fvdl 			revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
    379  1.16   mycroft 	}
    380  1.20   mycroft 
    381  1.20   mycroft 	return (revents);
    382   1.1       cgd }
    383   1.1       cgd 
    384  1.25      fvdl int
    385  1.30     lukem fifo_inactive(void *v)
    386  1.25      fvdl {
    387  1.25      fvdl 	struct vop_inactive_args /* {
    388  1.30     lukem 		struct vnode	*a_vp;
    389  1.41      fvdl 		struct proc	*a_p;
    390  1.25      fvdl 	} */ *ap = v;
    391  1.25      fvdl 
    392  1.25      fvdl 	VOP_UNLOCK(ap->a_vp, 0);
    393  1.25      fvdl 	return (0);
    394  1.25      fvdl }
    395  1.25      fvdl 
    396   1.1       cgd /*
    397   1.1       cgd  * This is a noop, simply returning what one has been given.
    398   1.1       cgd  */
    399  1.17  christos int
    400  1.30     lukem fifo_bmap(void *v)
    401  1.17  christos {
    402   1.8   mycroft 	struct vop_bmap_args /* {
    403  1.30     lukem 		struct vnode	*a_vp;
    404  1.30     lukem 		daddr_t		a_bn;
    405  1.30     lukem 		struct vnode	**a_vpp;
    406  1.30     lukem 		daddr_t		*a_bnp;
    407  1.30     lukem 		int		*a_runp;
    408  1.17  christos 	} */ *ap = v;
    409   1.1       cgd 
    410   1.8   mycroft 	if (ap->a_vpp != NULL)
    411   1.8   mycroft 		*ap->a_vpp = ap->a_vp;
    412   1.8   mycroft 	if (ap->a_bnp != NULL)
    413   1.8   mycroft 		*ap->a_bnp = ap->a_bn;
    414  1.25      fvdl 	if (ap->a_runp != NULL)
    415  1.25      fvdl 		*ap->a_runp = 0;
    416   1.1       cgd 	return (0);
    417   1.1       cgd }
    418   1.1       cgd 
    419   1.1       cgd /*
    420   1.1       cgd  * Device close routine
    421   1.1       cgd  */
    422   1.1       cgd /* ARGSUSED */
    423  1.17  christos int
    424  1.30     lukem fifo_close(void *v)
    425  1.17  christos {
    426   1.8   mycroft 	struct vop_close_args /* {
    427  1.30     lukem 		struct vnode	*a_vp;
    428  1.30     lukem 		int		a_fflag;
    429  1.30     lukem 		struct ucred	*a_cred;
    430  1.41      fvdl 		struct proc	*a_p;
    431  1.17  christos 	} */ *ap = v;
    432  1.30     lukem 	struct vnode	*vp;
    433  1.30     lukem 	struct fifoinfo	*fip;
    434   1.1       cgd 
    435  1.30     lukem 	vp = ap->a_vp;
    436  1.30     lukem 	fip = vp->v_fifoinfo;
    437  1.16   mycroft 	if (ap->a_fflag & FREAD) {
    438  1.16   mycroft 		if (--fip->fi_readers == 0)
    439  1.16   mycroft 			socantsendmore(fip->fi_writesock);
    440  1.16   mycroft 	}
    441   1.8   mycroft 	if (ap->a_fflag & FWRITE) {
    442  1.16   mycroft 		if (--fip->fi_writers == 0)
    443   1.1       cgd 			socantrcvmore(fip->fi_readsock);
    444   1.1       cgd 	}
    445  1.46  wrstuden 	/*
    446  1.46  wrstuden 	 * shut down if either last close, or if close called from
    447  1.46  wrstuden 	 * vclean()
    448  1.46  wrstuden 	 */
    449  1.46  wrstuden 	if ((--fip->fi_opencount == 0)
    450  1.46  wrstuden 	    || ((ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK)) {
    451  1.34       chs 		(void) soclose(fip->fi_readsock);
    452  1.34       chs 		(void) soclose(fip->fi_writesock);
    453  1.34       chs 		FREE(fip, M_VNODE);
    454  1.34       chs 		vp->v_fifoinfo = NULL;
    455  1.34       chs 	}
    456  1.34       chs 	return (0);
    457   1.1       cgd }
    458   1.1       cgd 
    459   1.1       cgd /*
    460   1.1       cgd  * Print out the contents of a fifo vnode.
    461   1.1       cgd  */
    462  1.17  christos int
    463  1.30     lukem fifo_print(void *v)
    464  1.17  christos {
    465   1.8   mycroft 	struct vop_print_args /* {
    466  1.30     lukem 		struct vnode	*a_vp;
    467  1.17  christos 	} */ *ap = v;
    468   1.1       cgd 
    469  1.22  christos 	printf("tag VT_NON");
    470   1.8   mycroft 	fifo_printinfo(ap->a_vp);
    471  1.22  christos 	printf("\n");
    472  1.17  christos 	return 0;
    473   1.1       cgd }
    474   1.1       cgd 
    475   1.1       cgd /*
    476   1.1       cgd  * Print out internal contents of a fifo vnode.
    477   1.1       cgd  */
    478  1.17  christos void
    479  1.30     lukem fifo_printinfo(struct vnode *vp)
    480   1.1       cgd {
    481  1.30     lukem 	struct fifoinfo	*fip;
    482   1.1       cgd 
    483  1.30     lukem 	fip = vp->v_fifoinfo;
    484  1.22  christos 	printf(", fifo with %ld readers and %ld writers",
    485  1.21  christos 	    fip->fi_readers, fip->fi_writers);
    486   1.1       cgd }
    487   1.1       cgd 
    488   1.1       cgd /*
    489   1.8   mycroft  * Return POSIX pathconf information applicable to fifo's.
    490   1.8   mycroft  */
    491  1.17  christos int
    492  1.30     lukem fifo_pathconf(void *v)
    493  1.17  christos {
    494   1.8   mycroft 	struct vop_pathconf_args /* {
    495  1.30     lukem 		struct vnode	*a_vp;
    496  1.30     lukem 		int		a_name;
    497  1.30     lukem 		register_t	*a_retval;
    498  1.17  christos 	} */ *ap = v;
    499   1.8   mycroft 
    500   1.8   mycroft 	switch (ap->a_name) {
    501   1.8   mycroft 	case _PC_LINK_MAX:
    502   1.8   mycroft 		*ap->a_retval = LINK_MAX;
    503   1.8   mycroft 		return (0);
    504   1.8   mycroft 	case _PC_PIPE_BUF:
    505   1.8   mycroft 		*ap->a_retval = PIPE_BUF;
    506   1.8   mycroft 		return (0);
    507   1.8   mycroft 	case _PC_CHOWN_RESTRICTED:
    508  1.26    kleink 		*ap->a_retval = 1;
    509  1.26    kleink 		return (0);
    510  1.26    kleink 	case _PC_SYNC_IO:
    511   1.8   mycroft 		*ap->a_retval = 1;
    512   1.8   mycroft 		return (0);
    513   1.8   mycroft 	default:
    514   1.8   mycroft 		return (EINVAL);
    515   1.8   mycroft 	}
    516   1.1       cgd 	/* NOTREACHED */
    517  1.36  jdolecek }
    518  1.36  jdolecek 
    519  1.36  jdolecek static void
    520  1.36  jdolecek filt_fifordetach(struct knote *kn)
    521  1.36  jdolecek {
    522  1.36  jdolecek 	struct socket *so;
    523  1.36  jdolecek 
    524  1.36  jdolecek 	so = (struct socket *)kn->kn_hook;
    525  1.37  christos 	SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
    526  1.37  christos 	if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
    527  1.36  jdolecek 		so->so_rcv.sb_flags &= ~SB_KNOTE;
    528  1.36  jdolecek }
    529  1.36  jdolecek 
    530  1.36  jdolecek static int
    531  1.36  jdolecek filt_fiforead(struct knote *kn, long hint)
    532  1.36  jdolecek {
    533  1.36  jdolecek 	struct socket *so;
    534  1.36  jdolecek 
    535  1.36  jdolecek 	so = (struct socket *)kn->kn_hook;
    536  1.36  jdolecek 	kn->kn_data = so->so_rcv.sb_cc;
    537  1.36  jdolecek 	if (so->so_state & SS_CANTRCVMORE) {
    538  1.36  jdolecek 		kn->kn_flags |= EV_EOF;
    539  1.36  jdolecek 		return (1);
    540  1.36  jdolecek 	}
    541  1.36  jdolecek 	kn->kn_flags &= ~EV_EOF;
    542  1.36  jdolecek 	return (kn->kn_data > 0);
    543  1.36  jdolecek }
    544  1.36  jdolecek 
    545  1.36  jdolecek static void
    546  1.36  jdolecek filt_fifowdetach(struct knote *kn)
    547  1.36  jdolecek {
    548  1.36  jdolecek 	struct socket *so;
    549  1.36  jdolecek 
    550  1.36  jdolecek 	so = (struct socket *)kn->kn_hook;
    551  1.37  christos 	SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
    552  1.37  christos 	if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
    553  1.36  jdolecek 		so->so_snd.sb_flags &= ~SB_KNOTE;
    554  1.36  jdolecek }
    555  1.36  jdolecek 
    556  1.36  jdolecek static int
    557  1.36  jdolecek filt_fifowrite(struct knote *kn, long hint)
    558  1.36  jdolecek {
    559  1.36  jdolecek 	struct socket *so;
    560  1.36  jdolecek 
    561  1.36  jdolecek 	so = (struct socket *)kn->kn_hook;
    562  1.36  jdolecek 	kn->kn_data = sbspace(&so->so_snd);
    563  1.36  jdolecek 	if (so->so_state & SS_CANTSENDMORE) {
    564  1.36  jdolecek 		kn->kn_flags |= EV_EOF;
    565  1.36  jdolecek 		return (1);
    566  1.36  jdolecek 	}
    567  1.36  jdolecek 	kn->kn_flags &= ~EV_EOF;
    568  1.36  jdolecek 	return (kn->kn_data >= so->so_snd.sb_lowat);
    569  1.36  jdolecek }
    570  1.36  jdolecek 
    571  1.36  jdolecek static const struct filterops fiforead_filtops =
    572  1.36  jdolecek 	{ 1, NULL, filt_fifordetach, filt_fiforead };
    573  1.36  jdolecek static const struct filterops fifowrite_filtops =
    574  1.36  jdolecek 	{ 1, NULL, filt_fifowdetach, filt_fifowrite };
    575  1.36  jdolecek 
    576  1.36  jdolecek /* ARGSUSED */
    577  1.36  jdolecek int
    578  1.36  jdolecek fifo_kqfilter(void *v)
    579  1.36  jdolecek {
    580  1.36  jdolecek 	struct vop_kqfilter_args /* {
    581  1.36  jdolecek 		struct vnode *a_vp;
    582  1.36  jdolecek 		struct knote *a_kn;
    583  1.36  jdolecek 	} */ *ap = v;
    584  1.36  jdolecek 	struct socket	*so;
    585  1.36  jdolecek 	struct sockbuf	*sb;
    586  1.36  jdolecek 
    587  1.36  jdolecek 	so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock;
    588  1.36  jdolecek 	switch (ap->a_kn->kn_filter) {
    589  1.36  jdolecek 	case EVFILT_READ:
    590  1.36  jdolecek 		ap->a_kn->kn_fop = &fiforead_filtops;
    591  1.36  jdolecek 		sb = &so->so_rcv;
    592  1.36  jdolecek 		break;
    593  1.36  jdolecek 	case EVFILT_WRITE:
    594  1.36  jdolecek 		ap->a_kn->kn_fop = &fifowrite_filtops;
    595  1.36  jdolecek 		sb = &so->so_snd;
    596  1.36  jdolecek 		break;
    597  1.36  jdolecek 	default:
    598  1.36  jdolecek 		return (1);
    599  1.36  jdolecek 	}
    600  1.36  jdolecek 
    601  1.36  jdolecek 	ap->a_kn->kn_hook = so;
    602  1.36  jdolecek 
    603  1.37  christos 	SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, ap->a_kn, kn_selnext);
    604  1.36  jdolecek 	sb->sb_flags |= SB_KNOTE;
    605  1.36  jdolecek 	return (0);
    606   1.1       cgd }
    607