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fdesc_vnops.c revision 1.96.6.2
      1  1.96.6.2        ad /*	$NetBSD: fdesc_vnops.c,v 1.96.6.2 2007/04/13 20:56:20 ad Exp $	*/
      2      1.15       cgd 
      3       1.1       cgd /*
      4      1.14   mycroft  * Copyright (c) 1992, 1993
      5      1.14   mycroft  *	The Regents of the University of California.  All rights reserved.
      6       1.1       cgd  *
      7       1.8       cgd  * This code is derived from software donated to Berkeley by
      8       1.1       cgd  * Jan-Simon Pendry.
      9       1.1       cgd  *
     10       1.2       cgd  * Redistribution and use in source and binary forms, with or without
     11       1.2       cgd  * modification, are permitted provided that the following conditions
     12       1.2       cgd  * are met:
     13       1.2       cgd  * 1. Redistributions of source code must retain the above copyright
     14       1.2       cgd  *    notice, this list of conditions and the following disclaimer.
     15       1.2       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.2       cgd  *    notice, this list of conditions and the following disclaimer in the
     17       1.2       cgd  *    documentation and/or other materials provided with the distribution.
     18      1.78       agc  * 3. Neither the name of the University nor the names of its contributors
     19       1.2       cgd  *    may be used to endorse or promote products derived from this software
     20       1.2       cgd  *    without specific prior written permission.
     21       1.1       cgd  *
     22       1.2       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23       1.2       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24       1.2       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25       1.2       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26       1.2       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27       1.2       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28       1.2       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29       1.2       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30       1.2       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31       1.2       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32       1.2       cgd  * SUCH DAMAGE.
     33       1.1       cgd  *
     34      1.44      fvdl  *	@(#)fdesc_vnops.c	8.17 (Berkeley) 5/22/95
     35      1.22   mycroft  *
     36      1.22   mycroft  * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp #
     37       1.1       cgd  */
     38       1.1       cgd 
     39       1.1       cgd /*
     40       1.1       cgd  * /dev/fd Filesystem
     41       1.1       cgd  */
     42      1.65     lukem 
     43      1.65     lukem #include <sys/cdefs.h>
     44  1.96.6.2        ad __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.96.6.2 2007/04/13 20:56:20 ad Exp $");
     45       1.1       cgd 
     46       1.8       cgd #include <sys/param.h>
     47       1.8       cgd #include <sys/systm.h>
     48       1.8       cgd #include <sys/time.h>
     49       1.8       cgd #include <sys/proc.h>
     50       1.8       cgd #include <sys/kernel.h>	/* boottime */
     51       1.8       cgd #include <sys/resourcevar.h>
     52      1.30  christos #include <sys/socketvar.h>
     53       1.8       cgd #include <sys/filedesc.h>
     54       1.8       cgd #include <sys/vnode.h>
     55      1.14   mycroft #include <sys/malloc.h>
     56      1.32       mrg #include <sys/conf.h>
     57       1.8       cgd #include <sys/file.h>
     58       1.8       cgd #include <sys/stat.h>
     59       1.8       cgd #include <sys/mount.h>
     60       1.8       cgd #include <sys/namei.h>
     61       1.8       cgd #include <sys/buf.h>
     62      1.14   mycroft #include <sys/dirent.h>
     63      1.30  christos #include <sys/tty.h>
     64      1.92      elad #include <sys/kauth.h>
     65      1.34   mycroft 
     66       1.8       cgd #include <miscfs/fdesc/fdesc.h>
     67      1.34   mycroft #include <miscfs/genfs/genfs.h>
     68       1.8       cgd 
     69      1.96        ad #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
     70       1.8       cgd 
     71       1.8       cgd #define FDL_WANT	0x01
     72       1.8       cgd #define FDL_LOCKED	0x02
     73      1.14   mycroft static int fdcache_lock;
     74      1.14   mycroft 
     75      1.14   mycroft dev_t devctty;
     76       1.8       cgd 
     77       1.8       cgd #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
     78       1.8       cgd FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
     79       1.8       cgd #endif
     80       1.8       cgd 
     81      1.16   mycroft #define	NFDCACHE 4
     82      1.14   mycroft 
     83      1.17   mycroft #define FD_NHASH(ix) \
     84      1.17   mycroft 	(&fdhashtbl[(ix) & fdhash])
     85      1.17   mycroft LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
     86      1.17   mycroft u_long fdhash;
     87      1.14   mycroft 
     88      1.86   xtraeme int	fdesc_lookup(void *);
     89      1.74  jdolecek #define	fdesc_create	genfs_eopnotsupp
     90      1.74  jdolecek #define	fdesc_mknod	genfs_eopnotsupp
     91      1.86   xtraeme int	fdesc_open(void *);
     92      1.34   mycroft #define	fdesc_close	genfs_nullop
     93      1.34   mycroft #define	fdesc_access	genfs_nullop
     94      1.86   xtraeme int	fdesc_getattr(void *);
     95      1.86   xtraeme int	fdesc_setattr(void *);
     96      1.86   xtraeme int	fdesc_read(void *);
     97      1.86   xtraeme int	fdesc_write(void *);
     98      1.86   xtraeme int	fdesc_ioctl(void *);
     99      1.86   xtraeme int	fdesc_poll(void *);
    100      1.86   xtraeme int	fdesc_kqfilter(void *);
    101      1.34   mycroft #define	fdesc_mmap	genfs_eopnotsupp
    102      1.50  wrstuden #define	fdesc_fcntl	genfs_fcntl
    103      1.34   mycroft #define	fdesc_fsync	genfs_nullop
    104      1.40      fvdl #define	fdesc_seek	genfs_seek
    105      1.74  jdolecek #define	fdesc_remove	genfs_eopnotsupp
    106      1.86   xtraeme int	fdesc_link(void *);
    107      1.74  jdolecek #define	fdesc_rename	genfs_eopnotsupp
    108      1.74  jdolecek #define	fdesc_mkdir	genfs_eopnotsupp
    109      1.74  jdolecek #define	fdesc_rmdir	genfs_eopnotsupp
    110      1.86   xtraeme int	fdesc_symlink(void *);
    111      1.86   xtraeme int	fdesc_readdir(void *);
    112      1.86   xtraeme int	fdesc_readlink(void *);
    113      1.34   mycroft #define	fdesc_abortop	genfs_abortop
    114      1.86   xtraeme int	fdesc_inactive(void *);
    115      1.86   xtraeme int	fdesc_reclaim(void *);
    116      1.48  wrstuden #define	fdesc_lock	genfs_lock
    117      1.48  wrstuden #define	fdesc_unlock	genfs_unlock
    118      1.34   mycroft #define	fdesc_bmap	genfs_badop
    119      1.34   mycroft #define	fdesc_strategy	genfs_badop
    120      1.86   xtraeme int	fdesc_print(void *);
    121      1.86   xtraeme int	fdesc_pathconf(void *);
    122      1.48  wrstuden #define	fdesc_islocked	genfs_islocked
    123      1.47    kleink #define	fdesc_advlock	genfs_einval
    124      1.34   mycroft #define	fdesc_bwrite	genfs_eopnotsupp
    125      1.44      fvdl #define fdesc_revoke	genfs_revoke
    126      1.67       chs #define fdesc_putpages	genfs_null_putpages
    127      1.30  christos 
    128      1.92      elad static int fdesc_attr(int, struct vattr *, kauth_cred_t, struct lwp *);
    129      1.30  christos 
    130      1.86   xtraeme int (**fdesc_vnodeop_p)(void *);
    131      1.58  jdolecek const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
    132      1.30  christos 	{ &vop_default_desc, vn_default_error },
    133      1.34   mycroft 	{ &vop_lookup_desc, fdesc_lookup },		/* lookup */
    134      1.34   mycroft 	{ &vop_create_desc, fdesc_create },		/* create */
    135      1.34   mycroft 	{ &vop_mknod_desc, fdesc_mknod },		/* mknod */
    136      1.34   mycroft 	{ &vop_open_desc, fdesc_open },			/* open */
    137      1.34   mycroft 	{ &vop_close_desc, fdesc_close },		/* close */
    138      1.34   mycroft 	{ &vop_access_desc, fdesc_access },		/* access */
    139      1.34   mycroft 	{ &vop_getattr_desc, fdesc_getattr },		/* getattr */
    140      1.34   mycroft 	{ &vop_setattr_desc, fdesc_setattr },		/* setattr */
    141      1.34   mycroft 	{ &vop_read_desc, fdesc_read },			/* read */
    142      1.34   mycroft 	{ &vop_write_desc, fdesc_write },		/* write */
    143      1.34   mycroft 	{ &vop_ioctl_desc, fdesc_ioctl },		/* ioctl */
    144      1.50  wrstuden 	{ &vop_fcntl_desc, fdesc_fcntl },		/* fcntl */
    145      1.35   mycroft 	{ &vop_poll_desc, fdesc_poll },			/* poll */
    146      1.71  jdolecek 	{ &vop_kqfilter_desc, fdesc_kqfilter },		/* kqfilter */
    147      1.44      fvdl 	{ &vop_revoke_desc, fdesc_revoke },		/* revoke */
    148      1.34   mycroft 	{ &vop_mmap_desc, fdesc_mmap },			/* mmap */
    149      1.34   mycroft 	{ &vop_fsync_desc, fdesc_fsync },		/* fsync */
    150      1.34   mycroft 	{ &vop_seek_desc, fdesc_seek },			/* seek */
    151      1.34   mycroft 	{ &vop_remove_desc, fdesc_remove },		/* remove */
    152      1.34   mycroft 	{ &vop_link_desc, fdesc_link },			/* link */
    153      1.34   mycroft 	{ &vop_rename_desc, fdesc_rename },		/* rename */
    154      1.34   mycroft 	{ &vop_mkdir_desc, fdesc_mkdir },		/* mkdir */
    155      1.34   mycroft 	{ &vop_rmdir_desc, fdesc_rmdir },		/* rmdir */
    156      1.34   mycroft 	{ &vop_symlink_desc, fdesc_symlink },		/* symlink */
    157      1.34   mycroft 	{ &vop_readdir_desc, fdesc_readdir },		/* readdir */
    158      1.34   mycroft 	{ &vop_readlink_desc, fdesc_readlink },		/* readlink */
    159      1.34   mycroft 	{ &vop_abortop_desc, fdesc_abortop },		/* abortop */
    160      1.34   mycroft 	{ &vop_inactive_desc, fdesc_inactive },		/* inactive */
    161      1.34   mycroft 	{ &vop_reclaim_desc, fdesc_reclaim },		/* reclaim */
    162      1.34   mycroft 	{ &vop_lock_desc, fdesc_lock },			/* lock */
    163      1.34   mycroft 	{ &vop_unlock_desc, fdesc_unlock },		/* unlock */
    164      1.34   mycroft 	{ &vop_bmap_desc, fdesc_bmap },			/* bmap */
    165      1.34   mycroft 	{ &vop_strategy_desc, fdesc_strategy },		/* strategy */
    166      1.34   mycroft 	{ &vop_print_desc, fdesc_print },		/* print */
    167      1.34   mycroft 	{ &vop_islocked_desc, fdesc_islocked },		/* islocked */
    168      1.34   mycroft 	{ &vop_pathconf_desc, fdesc_pathconf },		/* pathconf */
    169      1.34   mycroft 	{ &vop_advlock_desc, fdesc_advlock },		/* advlock */
    170      1.34   mycroft 	{ &vop_bwrite_desc, fdesc_bwrite },		/* bwrite */
    171      1.67       chs 	{ &vop_putpages_desc, fdesc_putpages },		/* putpages */
    172      1.67       chs 	{ NULL, NULL }
    173      1.30  christos };
    174      1.30  christos 
    175      1.58  jdolecek const struct vnodeopv_desc fdesc_vnodeop_opv_desc =
    176      1.30  christos 	{ &fdesc_vnodeop_p, fdesc_vnodeop_entries };
    177      1.30  christos 
    178      1.70   gehenna extern const struct cdevsw ctty_cdevsw;
    179      1.70   gehenna 
    180      1.14   mycroft /*
    181      1.14   mycroft  * Initialise cache headers
    182      1.14   mycroft  */
    183      1.30  christos void
    184      1.14   mycroft fdesc_init()
    185      1.14   mycroft {
    186      1.32       mrg 	int cttymajor;
    187      1.14   mycroft 
    188      1.32       mrg 	/* locate the major number */
    189      1.70   gehenna 	cttymajor = cdevsw_lookup_major(&ctty_cdevsw);
    190      1.32       mrg 	devctty = makedev(cttymajor, 0);
    191      1.57        ad 	fdhashtbl = hashinit(NFDCACHE, HASH_LIST, M_CACHE, M_NOWAIT, &fdhash);
    192      1.54  jdolecek }
    193      1.54  jdolecek 
    194      1.54  jdolecek /*
    195      1.54  jdolecek  * Free hash table.
    196      1.54  jdolecek  */
    197      1.54  jdolecek void
    198      1.54  jdolecek fdesc_done()
    199      1.54  jdolecek {
    200      1.54  jdolecek 	hashdone(fdhashtbl, M_CACHE);
    201      1.14   mycroft }
    202      1.14   mycroft 
    203      1.48  wrstuden /*
    204      1.48  wrstuden  * Return a locked vnode of the correct type.
    205      1.48  wrstuden  */
    206      1.14   mycroft int
    207       1.8       cgd fdesc_allocvp(ftype, ix, mp, vpp)
    208       1.8       cgd 	fdntype ftype;
    209       1.8       cgd 	int ix;
    210       1.8       cgd 	struct mount *mp;
    211       1.8       cgd 	struct vnode **vpp;
    212       1.8       cgd {
    213      1.17   mycroft 	struct fdhashhead *fc;
    214      1.14   mycroft 	struct fdescnode *fd;
    215       1.8       cgd 	int error = 0;
    216       1.8       cgd 
    217      1.17   mycroft 	fc = FD_NHASH(ix);
    218       1.8       cgd loop:
    219      1.17   mycroft 	for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
    220      1.14   mycroft 		if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
    221      1.76   thorpej 			if (vget(fd->fd_vnode, LK_EXCLUSIVE))
    222       1.8       cgd 				goto loop;
    223      1.14   mycroft 			*vpp = fd->fd_vnode;
    224       1.8       cgd 			return (error);
    225       1.8       cgd 		}
    226       1.8       cgd 	}
    227       1.8       cgd 
    228       1.8       cgd 	/*
    229       1.8       cgd 	 * otherwise lock the array while we call getnewvnode
    230       1.8       cgd 	 * since that can block.
    231      1.83     perry 	 */
    232      1.14   mycroft 	if (fdcache_lock & FDL_LOCKED) {
    233      1.14   mycroft 		fdcache_lock |= FDL_WANT;
    234      1.55   thorpej 		(void) tsleep(&fdcache_lock, PINOD, "fdcache", 0);
    235       1.8       cgd 		goto loop;
    236       1.8       cgd 	}
    237      1.14   mycroft 	fdcache_lock |= FDL_LOCKED;
    238       1.1       cgd 
    239      1.14   mycroft 	error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
    240       1.8       cgd 	if (error)
    241       1.8       cgd 		goto out;
    242      1.14   mycroft 	MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
    243      1.14   mycroft 	(*vpp)->v_data = fd;
    244      1.14   mycroft 	fd->fd_vnode = *vpp;
    245      1.14   mycroft 	fd->fd_type = ftype;
    246      1.14   mycroft 	fd->fd_fd = -1;
    247      1.14   mycroft 	fd->fd_link = 0;
    248      1.14   mycroft 	fd->fd_ix = ix;
    249      1.48  wrstuden 	VOP_LOCK(*vpp, LK_EXCLUSIVE);
    250      1.17   mycroft 	LIST_INSERT_HEAD(fc, fd, fd_hash);
    251       1.8       cgd 
    252       1.8       cgd out:;
    253      1.14   mycroft 	fdcache_lock &= ~FDL_LOCKED;
    254       1.8       cgd 
    255      1.14   mycroft 	if (fdcache_lock & FDL_WANT) {
    256      1.14   mycroft 		fdcache_lock &= ~FDL_WANT;
    257      1.81       jrf 		wakeup(&fdcache_lock);
    258       1.8       cgd 	}
    259       1.8       cgd 
    260       1.8       cgd 	return (error);
    261       1.8       cgd }
    262       1.1       cgd 
    263       1.1       cgd /*
    264       1.1       cgd  * vp is the current namei directory
    265       1.1       cgd  * ndp is the name to locate in that directory...
    266       1.1       cgd  */
    267      1.14   mycroft int
    268      1.30  christos fdesc_lookup(v)
    269      1.30  christos 	void *v;
    270      1.30  christos {
    271      1.14   mycroft 	struct vop_lookup_args /* {
    272      1.14   mycroft 		struct vnode * a_dvp;
    273      1.14   mycroft 		struct vnode ** a_vpp;
    274      1.14   mycroft 		struct componentname * a_cnp;
    275      1.30  christos 	} */ *ap = v;
    276      1.14   mycroft 	struct vnode **vpp = ap->a_vpp;
    277      1.14   mycroft 	struct vnode *dvp = ap->a_dvp;
    278      1.44      fvdl 	struct componentname *cnp = ap->a_cnp;
    279      1.89  christos 	struct lwp *l = cnp->cn_lwp;
    280      1.44      fvdl 	const char *pname = cnp->cn_nameptr;
    281      1.89  christos 	struct proc *p = l->l_proc;
    282      1.84  christos 	int numfiles = p->p_fd->fd_nfiles;
    283      1.30  christos 	unsigned fd = 0;
    284       1.1       cgd 	int error;
    285       1.1       cgd 	struct vnode *fvp;
    286      1.84  christos 	const char *ln;
    287       1.1       cgd 
    288      1.44      fvdl 	if (cnp->cn_namelen == 1 && *pname == '.') {
    289      1.14   mycroft 		*vpp = dvp;
    290      1.44      fvdl 		VREF(dvp);
    291       1.1       cgd 		return (0);
    292       1.1       cgd 	}
    293       1.1       cgd 
    294       1.8       cgd 	switch (VTOFDESC(dvp)->fd_type) {
    295       1.8       cgd 	default:
    296       1.8       cgd 	case Flink:
    297       1.8       cgd 	case Fdesc:
    298       1.8       cgd 	case Fctty:
    299       1.8       cgd 		error = ENOTDIR;
    300       1.8       cgd 		goto bad;
    301       1.8       cgd 
    302       1.8       cgd 	case Froot:
    303      1.46     perry 		if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) {
    304       1.8       cgd 			error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
    305       1.8       cgd 			if (error)
    306       1.8       cgd 				goto bad;
    307      1.14   mycroft 			*vpp = fvp;
    308       1.8       cgd 			fvp->v_type = VDIR;
    309      1.48  wrstuden 			goto good;
    310       1.8       cgd 		}
    311       1.8       cgd 
    312      1.46     perry 		if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) {
    313       1.8       cgd 			struct vnode *ttyvp = cttyvp(p);
    314       1.8       cgd 			if (ttyvp == NULL) {
    315       1.8       cgd 				error = ENXIO;
    316       1.8       cgd 				goto bad;
    317       1.8       cgd 			}
    318       1.8       cgd 			error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp);
    319       1.8       cgd 			if (error)
    320       1.8       cgd 				goto bad;
    321      1.14   mycroft 			*vpp = fvp;
    322      1.32       mrg 			fvp->v_type = VCHR;
    323      1.48  wrstuden 			goto good;
    324       1.8       cgd 		}
    325       1.8       cgd 
    326       1.8       cgd 		ln = 0;
    327      1.44      fvdl 		switch (cnp->cn_namelen) {
    328       1.8       cgd 		case 5:
    329      1.46     perry 			if (memcmp(pname, "stdin", 5) == 0) {
    330       1.8       cgd 				ln = "fd/0";
    331       1.8       cgd 				fd = FD_STDIN;
    332       1.8       cgd 			}
    333       1.1       cgd 			break;
    334       1.8       cgd 		case 6:
    335      1.46     perry 			if (memcmp(pname, "stdout", 6) == 0) {
    336       1.8       cgd 				ln = "fd/1";
    337       1.8       cgd 				fd = FD_STDOUT;
    338       1.8       cgd 			} else
    339      1.46     perry 			if (memcmp(pname, "stderr", 6) == 0) {
    340       1.8       cgd 				ln = "fd/2";
    341       1.8       cgd 				fd = FD_STDERR;
    342       1.8       cgd 			}
    343       1.8       cgd 			break;
    344       1.8       cgd 		}
    345       1.8       cgd 
    346       1.8       cgd 		if (ln) {
    347       1.8       cgd 			error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
    348       1.8       cgd 			if (error)
    349       1.8       cgd 				goto bad;
    350      1.84  christos 			/* XXXUNCONST */
    351      1.84  christos 			VTOFDESC(fvp)->fd_link = __UNCONST(ln);
    352      1.14   mycroft 			*vpp = fvp;
    353       1.8       cgd 			fvp->v_type = VLNK;
    354      1.48  wrstuden 			goto good;
    355       1.8       cgd 		} else {
    356       1.8       cgd 			error = ENOENT;
    357       1.8       cgd 			goto bad;
    358       1.8       cgd 		}
    359       1.8       cgd 
    360      1.14   mycroft 		/* FALL THROUGH */
    361       1.8       cgd 
    362       1.8       cgd 	case Fdevfd:
    363      1.46     perry 		if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) {
    364      1.48  wrstuden 			VOP_UNLOCK(dvp, 0);
    365      1.76   thorpej 			error = fdesc_root(dvp->v_mount, vpp);
    366      1.95       chs 			vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
    367      1.44      fvdl 			if (error)
    368      1.44      fvdl 				goto bad;
    369      1.48  wrstuden 			return (error);
    370       1.8       cgd 		}
    371       1.8       cgd 
    372       1.8       cgd 		fd = 0;
    373       1.8       cgd 		while (*pname >= '0' && *pname <= '9') {
    374       1.8       cgd 			fd = 10 * fd + *pname++ - '0';
    375      1.84  christos 			if (fd >= numfiles)
    376       1.8       cgd 				break;
    377       1.8       cgd 		}
    378       1.1       cgd 
    379       1.8       cgd 		if (*pname != '\0') {
    380       1.8       cgd 			error = ENOENT;
    381       1.8       cgd 			goto bad;
    382       1.8       cgd 		}
    383       1.1       cgd 
    384      1.84  christos 		if (fd >= numfiles || p->p_fd->fd_ofiles[fd] == NULL ||
    385      1.63   thorpej 		    FILE_IS_USABLE(p->p_fd->fd_ofiles[fd]) == 0) {
    386       1.8       cgd 			error = EBADF;
    387       1.8       cgd 			goto bad;
    388       1.8       cgd 		}
    389       1.1       cgd 
    390       1.8       cgd 		error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
    391       1.8       cgd 		if (error)
    392       1.8       cgd 			goto bad;
    393       1.8       cgd 		VTOFDESC(fvp)->fd_fd = fd;
    394      1.14   mycroft 		*vpp = fvp;
    395      1.48  wrstuden 		goto good;
    396       1.8       cgd 	}
    397       1.1       cgd 
    398      1.95       chs bad:
    399      1.14   mycroft 	*vpp = NULL;
    400       1.1       cgd 	return (error);
    401      1.48  wrstuden 
    402      1.95       chs good:
    403      1.48  wrstuden 	return (0);
    404       1.1       cgd }
    405       1.1       cgd 
    406      1.14   mycroft int
    407      1.30  christos fdesc_open(v)
    408      1.30  christos 	void *v;
    409      1.30  christos {
    410      1.14   mycroft 	struct vop_open_args /* {
    411      1.14   mycroft 		struct vnode *a_vp;
    412      1.14   mycroft 		int  a_mode;
    413      1.92      elad 		kauth_cred_t a_cred;
    414      1.89  christos 		struct lwp *a_l;
    415      1.30  christos 	} */ *ap = v;
    416      1.14   mycroft 	struct vnode *vp = ap->a_vp;
    417       1.8       cgd 
    418       1.8       cgd 	switch (VTOFDESC(vp)->fd_type) {
    419       1.8       cgd 	case Fdesc:
    420      1.23   mycroft 		/*
    421      1.79  jdolecek 		 * XXX Kludge: set dupfd to contain the value of the
    422      1.83     perry 		 * the file descriptor being sought for duplication. The error
    423      1.23   mycroft 		 * return ensures that the vnode for this device will be
    424      1.23   mycroft 		 * released by vn_open. Open will detect this special error and
    425      1.23   mycroft 		 * take the actions in dupfdopen.  Other callers of vn_open or
    426      1.23   mycroft 		 * VOP_OPEN will simply report the error.
    427      1.23   mycroft 		 */
    428      1.79  jdolecek 		curlwp->l_dupfd = VTOFDESC(vp)->fd_fd;	/* XXX */
    429      1.82  christos 		return EDUPFD;
    430       1.1       cgd 
    431       1.8       cgd 	case Fctty:
    432  1.96.6.2        ad 		return cdev_open(devctty, ap->a_mode, 0, ap->a_l);
    433      1.30  christos 	case Froot:
    434      1.30  christos 	case Fdevfd:
    435      1.30  christos 	case Flink:
    436      1.30  christos 		break;
    437       1.8       cgd 	}
    438       1.1       cgd 
    439      1.21   mycroft 	return (0);
    440       1.1       cgd }
    441       1.1       cgd 
    442       1.1       cgd static int
    443      1.89  christos fdesc_attr(fd, vap, cred, l)
    444       1.1       cgd 	int fd;
    445       1.1       cgd 	struct vattr *vap;
    446      1.92      elad 	kauth_cred_t cred;
    447      1.89  christos 	struct lwp *l;
    448       1.1       cgd {
    449      1.89  christos 	struct proc *p = l->l_proc;
    450       1.1       cgd 	struct filedesc *fdp = p->p_fd;
    451       1.1       cgd 	struct file *fp;
    452       1.8       cgd 	struct stat stb;
    453       1.1       cgd 	int error;
    454       1.1       cgd 
    455      1.63   thorpej 	if ((fp = fd_getfile(fdp, fd)) == NULL)
    456       1.1       cgd 		return (EBADF);
    457       1.1       cgd 
    458       1.1       cgd 	switch (fp->f_type) {
    459       1.1       cgd 	case DTYPE_VNODE:
    460  1.96.6.1        ad 		FILE_USE(fp);
    461      1.89  christos 		error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, l);
    462  1.96.6.1        ad 		FILE_UNUSE(fp, l);
    463       1.8       cgd 		if (error == 0 && vap->va_type == VDIR) {
    464       1.8       cgd 			/*
    465      1.22   mycroft 			 * directories can cause loops in the namespace,
    466      1.22   mycroft 			 * so turn off the 'x' bits to avoid trouble.
    467       1.8       cgd 			 */
    468      1.41   mycroft 			vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
    469       1.8       cgd 		}
    470       1.1       cgd 		break;
    471       1.1       cgd 
    472      1.69  jdolecek 	default:
    473      1.61  jdolecek 		FILE_USE(fp);
    474      1.69  jdolecek 		memset(&stb, 0, sizeof(stb));
    475      1.89  christos 		error = (*fp->f_ops->fo_stat)(fp, &stb, l);
    476      1.89  christos 		FILE_UNUSE(fp, l);
    477      1.69  jdolecek 		if (error)
    478      1.69  jdolecek 			break;
    479      1.69  jdolecek 
    480      1.69  jdolecek 		vattr_null(vap);
    481      1.69  jdolecek 		switch(fp->f_type) {
    482      1.69  jdolecek 		case DTYPE_SOCKET:
    483      1.69  jdolecek 			vap->va_type = VSOCK;
    484      1.69  jdolecek 			break;
    485      1.69  jdolecek 		case DTYPE_PIPE:
    486      1.69  jdolecek 			vap->va_type = VFIFO;
    487      1.69  jdolecek 			break;
    488      1.69  jdolecek 		default:
    489      1.69  jdolecek 			/* use VNON perhaps? */
    490      1.69  jdolecek 			vap->va_type = VBAD;
    491      1.69  jdolecek 			break;
    492       1.8       cgd 		}
    493      1.69  jdolecek 		vap->va_mode = stb.st_mode;
    494      1.69  jdolecek 		vap->va_nlink = stb.st_nlink;
    495      1.69  jdolecek 		vap->va_uid = stb.st_uid;
    496      1.69  jdolecek 		vap->va_gid = stb.st_gid;
    497      1.69  jdolecek 		vap->va_fsid = stb.st_dev;
    498      1.69  jdolecek 		vap->va_fileid = stb.st_ino;
    499      1.69  jdolecek 		vap->va_size = stb.st_size;
    500      1.69  jdolecek 		vap->va_blocksize = stb.st_blksize;
    501      1.69  jdolecek 		vap->va_atime = stb.st_atimespec;
    502      1.69  jdolecek 		vap->va_mtime = stb.st_mtimespec;
    503      1.69  jdolecek 		vap->va_ctime = stb.st_ctimespec;
    504      1.69  jdolecek 		vap->va_gen = stb.st_gen;
    505      1.69  jdolecek 		vap->va_flags = stb.st_flags;
    506      1.69  jdolecek 		vap->va_rdev = stb.st_rdev;
    507      1.69  jdolecek 		vap->va_bytes = stb.st_blocks * stb.st_blksize;
    508       1.1       cgd 		break;
    509       1.1       cgd 	}
    510       1.1       cgd 
    511       1.1       cgd 	return (error);
    512       1.1       cgd }
    513       1.1       cgd 
    514      1.14   mycroft int
    515      1.30  christos fdesc_getattr(v)
    516      1.30  christos 	void *v;
    517      1.30  christos {
    518      1.14   mycroft 	struct vop_getattr_args /* {
    519      1.14   mycroft 		struct vnode *a_vp;
    520      1.14   mycroft 		struct vattr *a_vap;
    521      1.92      elad 		kauth_cred_t a_cred;
    522      1.89  christos 		struct lwp *a_l;
    523      1.30  christos 	} */ *ap = v;
    524      1.14   mycroft 	struct vnode *vp = ap->a_vp;
    525      1.14   mycroft 	struct vattr *vap = ap->a_vap;
    526       1.1       cgd 	unsigned fd;
    527       1.8       cgd 	int error = 0;
    528       1.1       cgd 
    529       1.8       cgd 	switch (VTOFDESC(vp)->fd_type) {
    530       1.8       cgd 	case Froot:
    531       1.8       cgd 	case Fdevfd:
    532       1.8       cgd 	case Flink:
    533       1.8       cgd 	case Fctty:
    534      1.33       mrg 		VATTR_NULL(vap);
    535       1.8       cgd 		vap->va_fileid = VTOFDESC(vp)->fd_ix;
    536       1.8       cgd 
    537      1.30  christos #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH)
    538      1.30  christos #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH)
    539      1.30  christos #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH)
    540      1.30  christos 
    541       1.8       cgd 		switch (VTOFDESC(vp)->fd_type) {
    542       1.8       cgd 		case Flink:
    543      1.30  christos 			vap->va_mode = R_ALL|X_ALL;
    544       1.8       cgd 			vap->va_type = VLNK;
    545      1.32       mrg 			vap->va_rdev = 0;
    546       1.8       cgd 			vap->va_nlink = 1;
    547       1.8       cgd 			vap->va_size = strlen(VTOFDESC(vp)->fd_link);
    548       1.8       cgd 			break;
    549       1.8       cgd 
    550       1.8       cgd 		case Fctty:
    551      1.30  christos 			vap->va_mode = R_ALL|W_ALL;
    552      1.32       mrg 			vap->va_type = VCHR;
    553      1.32       mrg 			vap->va_rdev = devctty;
    554       1.8       cgd 			vap->va_nlink = 1;
    555       1.8       cgd 			vap->va_size = 0;
    556       1.8       cgd 			break;
    557       1.8       cgd 
    558       1.8       cgd 		default:
    559      1.30  christos 			vap->va_mode = R_ALL|X_ALL;
    560       1.8       cgd 			vap->va_type = VDIR;
    561      1.32       mrg 			vap->va_rdev = 0;
    562       1.8       cgd 			vap->va_nlink = 2;
    563       1.8       cgd 			vap->va_size = DEV_BSIZE;
    564       1.8       cgd 			break;
    565       1.8       cgd 		}
    566       1.1       cgd 		vap->va_uid = 0;
    567       1.1       cgd 		vap->va_gid = 0;
    568      1.80  christos 		vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
    569       1.1       cgd 		vap->va_blocksize = DEV_BSIZE;
    570      1.28       jtc 		vap->va_atime.tv_sec = boottime.tv_sec;
    571      1.28       jtc 		vap->va_atime.tv_nsec = 0;
    572       1.1       cgd 		vap->va_mtime = vap->va_atime;
    573      1.14   mycroft 		vap->va_ctime = vap->va_mtime;
    574       1.1       cgd 		vap->va_gen = 0;
    575       1.1       cgd 		vap->va_flags = 0;
    576       1.1       cgd 		vap->va_bytes = 0;
    577       1.8       cgd 		break;
    578       1.8       cgd 
    579       1.8       cgd 	case Fdesc:
    580       1.8       cgd 		fd = VTOFDESC(vp)->fd_fd;
    581      1.89  christos 		error = fdesc_attr(fd, vap, ap->a_cred, ap->a_l);
    582       1.8       cgd 		break;
    583       1.8       cgd 
    584       1.8       cgd 	default:
    585       1.8       cgd 		panic("fdesc_getattr");
    586      1.83     perry 		break;
    587       1.1       cgd 	}
    588       1.1       cgd 
    589       1.1       cgd 	if (error == 0)
    590       1.1       cgd 		vp->v_type = vap->va_type;
    591       1.8       cgd 
    592       1.1       cgd 	return (error);
    593       1.1       cgd }
    594       1.1       cgd 
    595      1.14   mycroft int
    596      1.30  christos fdesc_setattr(v)
    597      1.30  christos 	void *v;
    598      1.30  christos {
    599      1.14   mycroft 	struct vop_setattr_args /* {
    600      1.14   mycroft 		struct vnode *a_vp;
    601      1.14   mycroft 		struct vattr *a_vap;
    602      1.92      elad 		kauth_cred_t a_cred;
    603      1.89  christos 		struct lwp *a_l;
    604      1.30  christos 	} */ *ap = v;
    605      1.89  christos 	struct filedesc *fdp = ap->a_l->l_proc->p_fd;
    606      1.73        pk 	struct file *fp;
    607       1.1       cgd 	unsigned fd;
    608       1.1       cgd 
    609       1.1       cgd 	/*
    610       1.1       cgd 	 * Can't mess with the root vnode
    611       1.1       cgd 	 */
    612      1.14   mycroft 	switch (VTOFDESC(ap->a_vp)->fd_type) {
    613       1.8       cgd 	case Fdesc:
    614       1.8       cgd 		break;
    615       1.8       cgd 
    616       1.8       cgd 	case Fctty:
    617       1.8       cgd 		return (0);
    618       1.8       cgd 
    619       1.8       cgd 	default:
    620       1.1       cgd 		return (EACCES);
    621       1.8       cgd 	}
    622       1.1       cgd 
    623      1.14   mycroft 	fd = VTOFDESC(ap->a_vp)->fd_fd;
    624      1.73        pk 	if ((fp = fd_getfile(fdp, fd)) == NULL)
    625       1.1       cgd 		return (EBADF);
    626       1.1       cgd 
    627       1.1       cgd 	/*
    628      1.68       jmc 	 * XXX: Can't reasonably set the attr's on any types currently.
    629      1.68       jmc 	 *      On vnode's this will cause truncation and socket/pipes make
    630      1.68       jmc 	 *      no sense.
    631       1.1       cgd 	 */
    632  1.96.6.1        ad 	mutex_exit(&fp->f_lock);
    633      1.69  jdolecek 	return (0);
    634       1.1       cgd }
    635       1.1       cgd 
    636       1.8       cgd 
    637      1.25   mycroft struct fdesc_target {
    638      1.25   mycroft 	ino_t ft_fileno;
    639      1.25   mycroft 	u_char ft_type;
    640      1.25   mycroft 	u_char ft_namlen;
    641      1.84  christos 	const char *ft_name;
    642      1.25   mycroft } fdesc_targets[] = {
    643      1.25   mycroft #define N(s) sizeof(s)-1, s
    644      1.25   mycroft 	{ FD_DEVFD,  DT_DIR,     N("fd")     },
    645      1.27   mycroft 	{ FD_STDIN,  DT_LNK,     N("stdin")  },
    646      1.27   mycroft 	{ FD_STDOUT, DT_LNK,     N("stdout") },
    647      1.27   mycroft 	{ FD_STDERR, DT_LNK,     N("stderr") },
    648      1.25   mycroft 	{ FD_CTTY,   DT_UNKNOWN, N("tty")    },
    649      1.25   mycroft #undef N
    650      1.85  christos #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1)
    651       1.8       cgd };
    652      1.25   mycroft static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]);
    653       1.8       cgd 
    654      1.14   mycroft int
    655      1.30  christos fdesc_readdir(v)
    656      1.30  christos 	void *v;
    657      1.30  christos {
    658      1.14   mycroft 	struct vop_readdir_args /* {
    659      1.14   mycroft 		struct vnode *a_vp;
    660      1.14   mycroft 		struct uio *a_uio;
    661      1.92      elad 		kauth_cred_t a_cred;
    662      1.22   mycroft 		int *a_eofflag;
    663      1.44      fvdl 		off_t **a_cookies;
    664      1.44      fvdl 		int *a_ncookies;
    665      1.30  christos 	} */ *ap = v;
    666      1.14   mycroft 	struct uio *uio = ap->a_uio;
    667      1.25   mycroft 	struct dirent d;
    668       1.1       cgd 	struct filedesc *fdp;
    669      1.53  sommerfe 	off_t i;
    670      1.87  christos 	int j;
    671       1.1       cgd 	int error;
    672      1.44      fvdl 	off_t *cookies = NULL;
    673      1.87  christos 	int ncookies;
    674      1.11        ws 
    675      1.14   mycroft 	switch (VTOFDESC(ap->a_vp)->fd_type) {
    676       1.8       cgd 	case Fctty:
    677      1.87  christos 		return 0;
    678       1.8       cgd 
    679       1.8       cgd 	case Fdesc:
    680      1.87  christos 		return ENOTDIR;
    681      1.30  christos 
    682      1.30  christos 	default:
    683      1.30  christos 		break;
    684       1.8       cgd 	}
    685       1.1       cgd 
    686      1.90      yamt 	fdp = curproc->p_fd;
    687       1.8       cgd 
    688      1.25   mycroft 	if (uio->uio_resid < UIO_MX)
    689      1.87  christos 		return EINVAL;
    690      1.26   mycroft 	if (uio->uio_offset < 0)
    691      1.87  christos 		return EINVAL;
    692      1.25   mycroft 
    693      1.25   mycroft 	error = 0;
    694      1.26   mycroft 	i = uio->uio_offset;
    695      1.87  christos 	(void)memset(&d, 0, UIO_MX);
    696      1.25   mycroft 	d.d_reclen = UIO_MX;
    697      1.44      fvdl 	if (ap->a_ncookies)
    698      1.87  christos 		ncookies = uio->uio_resid / UIO_MX;
    699      1.87  christos 	else
    700      1.87  christos 		ncookies = 0;
    701      1.25   mycroft 
    702      1.14   mycroft 	if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
    703      1.25   mycroft 		struct fdesc_target *ft;
    704      1.51  christos 
    705      1.51  christos 		if (i >= nfdesc_targets)
    706      1.52  sommerfe 			return 0;
    707       1.3       cgd 
    708      1.44      fvdl 		if (ap->a_ncookies) {
    709      1.44      fvdl 			ncookies = min(ncookies, (nfdesc_targets - i));
    710      1.56   thorpej 			cookies = malloc(ncookies * sizeof(off_t),
    711      1.44      fvdl 			    M_TEMP, M_WAITOK);
    712      1.44      fvdl 			*ap->a_cookies = cookies;
    713      1.44      fvdl 			*ap->a_ncookies = ncookies;
    714      1.44      fvdl 		}
    715      1.44      fvdl 
    716      1.87  christos 		for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX &&
    717      1.87  christos 		    i < nfdesc_targets; ft++, i++) {
    718      1.25   mycroft 			switch (ft->ft_fileno) {
    719       1.8       cgd 			case FD_CTTY:
    720      1.90      yamt 				if (cttyvp(curproc) == NULL)
    721       1.8       cgd 					continue;
    722       1.8       cgd 				break;
    723       1.8       cgd 
    724       1.8       cgd 			case FD_STDIN:
    725       1.8       cgd 			case FD_STDOUT:
    726       1.8       cgd 			case FD_STDERR:
    727      1.87  christos 				if (fdp == NULL)
    728       1.8       cgd 					continue;
    729      1.87  christos 				if ((ft->ft_fileno - FD_STDIN) >=
    730      1.87  christos 				    fdp->fd_nfiles)
    731      1.87  christos 					continue;
    732      1.87  christos 				if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN]
    733      1.87  christos 				    == NULL
    734      1.87  christos 				    || FILE_IS_USABLE(
    735      1.87  christos 				    fdp->fd_ofiles[ft->ft_fileno - FD_STDIN])
    736      1.87  christos 				    == 0)
    737       1.8       cgd 					continue;
    738       1.8       cgd 				break;
    739       1.8       cgd 			}
    740      1.25   mycroft 
    741      1.25   mycroft 			d.d_fileno = ft->ft_fileno;
    742      1.25   mycroft 			d.d_namlen = ft->ft_namlen;
    743      1.87  christos 			(void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1);
    744      1.25   mycroft 			d.d_type = ft->ft_type;
    745      1.25   mycroft 
    746      1.81       jrf 			if ((error = uiomove(&d, UIO_MX, uio)) != 0)
    747       1.8       cgd 				break;
    748      1.44      fvdl 			if (cookies)
    749      1.26   mycroft 				*cookies++ = i + 1;
    750       1.3       cgd 		}
    751      1.25   mycroft 	} else {
    752      1.87  christos 		int nfdp = fdp ? fdp->fd_nfiles : 0;
    753      1.44      fvdl 		if (ap->a_ncookies) {
    754      1.87  christos 			ncookies = min(ncookies, nfdp + 2);
    755      1.56   thorpej 			cookies = malloc(ncookies * sizeof(off_t),
    756      1.56   thorpej 			    M_TEMP, M_WAITOK);
    757      1.44      fvdl 			*ap->a_cookies = cookies;
    758      1.44      fvdl 			*ap->a_ncookies = ncookies;
    759      1.44      fvdl 		}
    760      1.87  christos 		for (; i - 2 < nfdp && uio->uio_resid >= UIO_MX; i++) {
    761      1.25   mycroft 			switch (i) {
    762      1.25   mycroft 			case 0:
    763      1.25   mycroft 			case 1:
    764      1.25   mycroft 				d.d_fileno = FD_ROOT;		/* XXX */
    765      1.25   mycroft 				d.d_namlen = i + 1;
    766      1.87  christos 				(void)memcpy(d.d_name, "..", d.d_namlen);
    767      1.25   mycroft 				d.d_name[i + 1] = '\0';
    768      1.25   mycroft 				d.d_type = DT_DIR;
    769      1.25   mycroft 				break;
    770      1.83     perry 
    771      1.25   mycroft 			default:
    772      1.87  christos 				KASSERT(fdp != NULL);
    773      1.87  christos 				j = (int)i - 2;
    774      1.91  christos 				if (fdp == NULL || fdp->fd_ofiles[j] == NULL ||
    775      1.87  christos 				    FILE_IS_USABLE(fdp->fd_ofiles[j]) == 0)
    776      1.25   mycroft 					continue;
    777      1.87  christos 				d.d_fileno = j + FD_STDIN;
    778      1.87  christos 				d.d_namlen = sprintf(d.d_name, "%d", j);
    779      1.25   mycroft 				d.d_type = DT_UNKNOWN;
    780      1.25   mycroft 				break;
    781      1.25   mycroft 			}
    782       1.8       cgd 
    783      1.81       jrf 			if ((error = uiomove(&d, UIO_MX, uio)) != 0)
    784       1.1       cgd 				break;
    785      1.44      fvdl 			if (cookies)
    786      1.26   mycroft 				*cookies++ = i + 1;
    787       1.1       cgd 		}
    788       1.8       cgd 	}
    789       1.8       cgd 
    790      1.44      fvdl 	if (ap->a_ncookies && error) {
    791      1.56   thorpej 		free(*ap->a_cookies, M_TEMP);
    792      1.44      fvdl 		*ap->a_ncookies = 0;
    793      1.44      fvdl 		*ap->a_cookies = NULL;
    794      1.44      fvdl 	}
    795      1.44      fvdl 
    796      1.26   mycroft 	uio->uio_offset = i;
    797      1.87  christos 	return error;
    798       1.8       cgd }
    799       1.8       cgd 
    800      1.14   mycroft int
    801      1.30  christos fdesc_readlink(v)
    802      1.30  christos 	void *v;
    803      1.30  christos {
    804      1.14   mycroft 	struct vop_readlink_args /* {
    805      1.14   mycroft 		struct vnode *a_vp;
    806      1.14   mycroft 		struct uio *a_uio;
    807      1.92      elad 		kauth_cred_t a_cred;
    808      1.30  christos 	} */ *ap = v;
    809      1.14   mycroft 	struct vnode *vp = ap->a_vp;
    810       1.8       cgd 	int error;
    811       1.8       cgd 
    812      1.14   mycroft 	if (vp->v_type != VLNK)
    813      1.14   mycroft 		return (EPERM);
    814      1.14   mycroft 
    815       1.8       cgd 	if (VTOFDESC(vp)->fd_type == Flink) {
    816       1.8       cgd 		char *ln = VTOFDESC(vp)->fd_link;
    817      1.14   mycroft 		error = uiomove(ln, strlen(ln), ap->a_uio);
    818       1.8       cgd 	} else {
    819       1.8       cgd 		error = EOPNOTSUPP;
    820       1.8       cgd 	}
    821       1.8       cgd 
    822       1.8       cgd 	return (error);
    823       1.8       cgd }
    824       1.8       cgd 
    825      1.14   mycroft int
    826      1.30  christos fdesc_read(v)
    827      1.30  christos 	void *v;
    828      1.30  christos {
    829      1.14   mycroft 	struct vop_read_args /* {
    830      1.14   mycroft 		struct vnode *a_vp;
    831      1.14   mycroft 		struct uio *a_uio;
    832      1.14   mycroft 		int  a_ioflag;
    833      1.92      elad 		kauth_cred_t a_cred;
    834      1.30  christos 	} */ *ap = v;
    835       1.8       cgd 	int error = EOPNOTSUPP;
    836      1.49   thorpej 	struct vnode *vp = ap->a_vp;
    837       1.8       cgd 
    838      1.49   thorpej 	switch (VTOFDESC(vp)->fd_type) {
    839       1.8       cgd 	case Fctty:
    840      1.49   thorpej 		VOP_UNLOCK(vp, 0);
    841  1.96.6.2        ad 		error = cdev_read(devctty, ap->a_uio, ap->a_ioflag);
    842      1.49   thorpej 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    843       1.8       cgd 		break;
    844       1.8       cgd 
    845       1.8       cgd 	default:
    846       1.8       cgd 		error = EOPNOTSUPP;
    847       1.8       cgd 		break;
    848       1.8       cgd 	}
    849      1.83     perry 
    850       1.8       cgd 	return (error);
    851       1.8       cgd }
    852       1.8       cgd 
    853      1.14   mycroft int
    854      1.30  christos fdesc_write(v)
    855      1.30  christos 	void *v;
    856      1.30  christos {
    857      1.14   mycroft 	struct vop_write_args /* {
    858      1.14   mycroft 		struct vnode *a_vp;
    859      1.14   mycroft 		struct uio *a_uio;
    860      1.14   mycroft 		int  a_ioflag;
    861      1.92      elad 		kauth_cred_t a_cred;
    862      1.30  christos 	} */ *ap = v;
    863       1.8       cgd 	int error = EOPNOTSUPP;
    864      1.49   thorpej 	struct vnode *vp = ap->a_vp;
    865       1.8       cgd 
    866      1.49   thorpej 	switch (VTOFDESC(vp)->fd_type) {
    867       1.8       cgd 	case Fctty:
    868      1.49   thorpej 		VOP_UNLOCK(vp, 0);
    869  1.96.6.2        ad 		error = cdev_write(devctty, ap->a_uio, ap->a_ioflag);
    870      1.49   thorpej 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    871       1.8       cgd 		break;
    872       1.8       cgd 
    873       1.8       cgd 	default:
    874       1.8       cgd 		error = EOPNOTSUPP;
    875       1.8       cgd 		break;
    876       1.8       cgd 	}
    877      1.83     perry 
    878       1.8       cgd 	return (error);
    879       1.8       cgd }
    880       1.8       cgd 
    881      1.14   mycroft int
    882      1.30  christos fdesc_ioctl(v)
    883      1.30  christos 	void *v;
    884      1.30  christos {
    885      1.14   mycroft 	struct vop_ioctl_args /* {
    886      1.14   mycroft 		struct vnode *a_vp;
    887      1.19       cgd 		u_long a_command;
    888      1.81       jrf 		void *a_data;
    889      1.14   mycroft 		int  a_fflag;
    890      1.92      elad 		kauth_cred_t a_cred;
    891      1.89  christos 		struct lwp *a_l;
    892      1.30  christos 	} */ *ap = v;
    893       1.8       cgd 	int error = EOPNOTSUPP;
    894       1.8       cgd 
    895      1.14   mycroft 	switch (VTOFDESC(ap->a_vp)->fd_type) {
    896       1.8       cgd 	case Fctty:
    897  1.96.6.2        ad 		error = cdev_ioctl(devctty, ap->a_command, ap->a_data,
    898  1.96.6.2        ad 		    ap->a_fflag, ap->a_l);
    899       1.8       cgd 		break;
    900       1.8       cgd 
    901       1.8       cgd 	default:
    902       1.8       cgd 		error = EOPNOTSUPP;
    903       1.8       cgd 		break;
    904       1.1       cgd 	}
    905      1.83     perry 
    906       1.8       cgd 	return (error);
    907       1.8       cgd }
    908       1.8       cgd 
    909      1.14   mycroft int
    910      1.35   mycroft fdesc_poll(v)
    911      1.30  christos 	void *v;
    912      1.30  christos {
    913      1.35   mycroft 	struct vop_poll_args /* {
    914      1.14   mycroft 		struct vnode *a_vp;
    915      1.35   mycroft 		int a_events;
    916      1.89  christos 		struct lwp *a_l;
    917      1.30  christos 	} */ *ap = v;
    918      1.35   mycroft 	int revents;
    919       1.8       cgd 
    920      1.14   mycroft 	switch (VTOFDESC(ap->a_vp)->fd_type) {
    921       1.8       cgd 	case Fctty:
    922  1.96.6.2        ad 		revents = cdev_poll(devctty, ap->a_events, ap->a_l);
    923       1.8       cgd 		break;
    924       1.1       cgd 
    925       1.8       cgd 	default:
    926      1.35   mycroft 		revents = genfs_poll(v);
    927       1.8       cgd 		break;
    928       1.8       cgd 	}
    929      1.34   mycroft 
    930      1.35   mycroft 	return (revents);
    931      1.71  jdolecek }
    932      1.71  jdolecek 
    933      1.71  jdolecek int
    934      1.71  jdolecek fdesc_kqfilter(v)
    935      1.71  jdolecek 	void *v;
    936      1.71  jdolecek {
    937      1.71  jdolecek 	struct vop_kqfilter_args /* {
    938      1.71  jdolecek 		struct vnode *a_vp;
    939      1.71  jdolecek 		struct knote *a_kn;
    940      1.71  jdolecek 	} */ *ap = v;
    941      1.71  jdolecek 	int error;
    942      1.71  jdolecek 	struct proc *p;
    943      1.89  christos 	struct lwp *l;
    944      1.71  jdolecek 	struct file *fp;
    945      1.71  jdolecek 
    946      1.71  jdolecek 	switch (VTOFDESC(ap->a_vp)->fd_type) {
    947      1.71  jdolecek 	case Fctty:
    948  1.96.6.2        ad 		error = cdev_kqfilter(devctty, ap->a_kn);
    949      1.71  jdolecek 		break;
    950      1.71  jdolecek 
    951      1.71  jdolecek 	case Fdesc:
    952      1.71  jdolecek 		/* just invoke kqfilter for the underlying descriptor */
    953      1.89  christos 		l = curlwp;	/* XXX hopefully ok to use curproc here */
    954      1.89  christos 		p = l->l_proc;
    955      1.71  jdolecek 		if ((fp = fd_getfile(p->p_fd, VTOFDESC(ap->a_vp)->fd_fd)) == NULL)
    956      1.71  jdolecek 			return (1);
    957      1.83     perry 
    958      1.71  jdolecek 		FILE_USE(fp);
    959      1.71  jdolecek 		error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn);
    960      1.89  christos 		FILE_UNUSE(fp, l);
    961      1.71  jdolecek 		break;
    962      1.71  jdolecek 
    963      1.71  jdolecek 	default:
    964      1.71  jdolecek 		return (genfs_kqfilter(v));
    965      1.71  jdolecek 	}
    966      1.71  jdolecek 
    967      1.71  jdolecek 	return (error);
    968       1.1       cgd }
    969       1.1       cgd 
    970      1.14   mycroft int
    971      1.30  christos fdesc_inactive(v)
    972      1.30  christos 	void *v;
    973      1.30  christos {
    974      1.14   mycroft 	struct vop_inactive_args /* {
    975      1.14   mycroft 		struct vnode *a_vp;
    976      1.89  christos 		struct lwp *a_l;
    977      1.30  christos 	} */ *ap = v;
    978      1.14   mycroft 	struct vnode *vp = ap->a_vp;
    979      1.14   mycroft 
    980       1.1       cgd 	/*
    981       1.1       cgd 	 * Clear out the v_type field to avoid
    982       1.1       cgd 	 * nasty things happening in vgone().
    983       1.1       cgd 	 */
    984      1.44      fvdl 	VOP_UNLOCK(vp, 0);
    985       1.1       cgd 	vp->v_type = VNON;
    986       1.1       cgd 	return (0);
    987       1.1       cgd }
    988       1.1       cgd 
    989      1.14   mycroft int
    990      1.30  christos fdesc_reclaim(v)
    991      1.30  christos 	void *v;
    992      1.30  christos {
    993      1.14   mycroft 	struct vop_reclaim_args /* {
    994      1.14   mycroft 		struct vnode *a_vp;
    995      1.30  christos 	} */ *ap = v;
    996      1.14   mycroft 	struct vnode *vp = ap->a_vp;
    997      1.17   mycroft 	struct fdescnode *fd = VTOFDESC(vp);
    998      1.14   mycroft 
    999      1.17   mycroft 	LIST_REMOVE(fd, fd_hash);
   1000      1.14   mycroft 	FREE(vp->v_data, M_TEMP);
   1001      1.14   mycroft 	vp->v_data = 0;
   1002      1.14   mycroft 
   1003      1.14   mycroft 	return (0);
   1004      1.14   mycroft }
   1005      1.14   mycroft 
   1006      1.14   mycroft /*
   1007      1.14   mycroft  * Return POSIX pathconf information applicable to special devices.
   1008      1.14   mycroft  */
   1009      1.30  christos int
   1010      1.30  christos fdesc_pathconf(v)
   1011      1.30  christos 	void *v;
   1012      1.30  christos {
   1013      1.14   mycroft 	struct vop_pathconf_args /* {
   1014      1.14   mycroft 		struct vnode *a_vp;
   1015      1.14   mycroft 		int a_name;
   1016      1.18       cgd 		register_t *a_retval;
   1017      1.30  christos 	} */ *ap = v;
   1018       1.8       cgd 
   1019      1.14   mycroft 	switch (ap->a_name) {
   1020      1.14   mycroft 	case _PC_LINK_MAX:
   1021      1.14   mycroft 		*ap->a_retval = LINK_MAX;
   1022      1.14   mycroft 		return (0);
   1023      1.14   mycroft 	case _PC_MAX_CANON:
   1024      1.14   mycroft 		*ap->a_retval = MAX_CANON;
   1025      1.14   mycroft 		return (0);
   1026      1.14   mycroft 	case _PC_MAX_INPUT:
   1027      1.14   mycroft 		*ap->a_retval = MAX_INPUT;
   1028      1.14   mycroft 		return (0);
   1029      1.14   mycroft 	case _PC_PIPE_BUF:
   1030      1.14   mycroft 		*ap->a_retval = PIPE_BUF;
   1031      1.14   mycroft 		return (0);
   1032      1.14   mycroft 	case _PC_CHOWN_RESTRICTED:
   1033      1.14   mycroft 		*ap->a_retval = 1;
   1034      1.14   mycroft 		return (0);
   1035      1.14   mycroft 	case _PC_VDISABLE:
   1036      1.14   mycroft 		*ap->a_retval = _POSIX_VDISABLE;
   1037      1.45    kleink 		return (0);
   1038      1.45    kleink 	case _PC_SYNC_IO:
   1039      1.45    kleink 		*ap->a_retval = 1;
   1040      1.14   mycroft 		return (0);
   1041      1.14   mycroft 	default:
   1042      1.14   mycroft 		return (EINVAL);
   1043       1.8       cgd 	}
   1044      1.14   mycroft 	/* NOTREACHED */
   1045       1.8       cgd }
   1046       1.8       cgd 
   1047       1.1       cgd /*
   1048       1.1       cgd  * Print out the contents of a /dev/fd vnode.
   1049       1.1       cgd  */
   1050       1.1       cgd /* ARGSUSED */
   1051      1.14   mycroft int
   1052      1.94  christos fdesc_print(void *v)
   1053       1.1       cgd {
   1054      1.37  christos 	printf("tag VT_NON, fdesc vnode\n");
   1055      1.14   mycroft 	return (0);
   1056      1.14   mycroft }
   1057      1.14   mycroft 
   1058      1.14   mycroft int
   1059      1.83     perry fdesc_link(v)
   1060      1.30  christos 	void *v;
   1061      1.30  christos {
   1062      1.29   mycroft 	struct vop_link_args /* {
   1063      1.29   mycroft 		struct vnode *a_dvp;
   1064      1.83     perry 		struct vnode *a_vp;
   1065      1.29   mycroft 		struct componentname *a_cnp;
   1066      1.30  christos 	} */ *ap = v;
   1067      1.83     perry 
   1068      1.29   mycroft 	VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
   1069      1.29   mycroft 	vput(ap->a_dvp);
   1070      1.29   mycroft 	return (EROFS);
   1071      1.29   mycroft }
   1072      1.29   mycroft 
   1073      1.29   mycroft int
   1074      1.30  christos fdesc_symlink(v)
   1075      1.30  christos 	void *v;
   1076      1.30  christos {
   1077      1.29   mycroft 	struct vop_symlink_args /* {
   1078      1.29   mycroft 		struct vnode *a_dvp;
   1079      1.29   mycroft 		struct vnode **a_vpp;
   1080      1.29   mycroft 		struct componentname *a_cnp;
   1081      1.29   mycroft 		struct vattr *a_vap;
   1082      1.29   mycroft 		char *a_target;
   1083      1.30  christos 	} */ *ap = v;
   1084      1.83     perry 
   1085      1.29   mycroft 	VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
   1086      1.29   mycroft 	vput(ap->a_dvp);
   1087      1.29   mycroft 	return (EROFS);
   1088       1.1       cgd }
   1089