NetBSD/sys/miscfs/fdesc/fdesc_vnops.c

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/* $NetBSD: fdesc_vnops.c,v 1.42 1997/10/10 02:00:56 fvdl Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
changed copyright notice thanks to following statement: Return-Path: jsp@compnews.co.uk Received: from ben.uknet.ac.uk by postgres.Berkeley.EDU (5.61/1.29) id AA25983; Thu, 25 Mar 93 05:37:37 -0800 Received: from fennel.compnews.co.uk by ben.uknet.ac.uk via UKIP with SMTP (PP) id <g.05640-0@ben.uknet.ac.uk>; Thu, 25 Mar 1993 13:37:19 +0000 Received: from sage.compnews.co.uk by fennel.compnews.co.uk; Thu, 25 Mar 93 13:37:08 GMT Message-Id: <28109.9303251337@sage.compnews.co.uk> From: jsp@compnews.co.uk (Jan-Simon Pendry) Date: Thu, 25 Mar 1993 13:37:05 +0100 In-Reply-To: cgd@postgres.berkeley.edu's message as of Mar 25, 5:32am. Phone-Number-1: +44 430 432450 Phone-Number-2: +44 430 432480 x20 Fax-Number: +44 430 432022 X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: cgd@postgres.berkeley.edu Subject: Re: fdesc/kernfs/etc code... You may put this copyright message on the source code: /* * Copyright (c) 1990, 1992 Jan-Simon Pendry * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
changed copyright notice thanks to following statement: Return-Path: jsp@compnews.co.uk Received: from ben.uknet.ac.uk by postgres.Berkeley.EDU (5.61/1.29) id AA25983; Thu, 25 Mar 93 05:37:37 -0800 Received: from fennel.compnews.co.uk by ben.uknet.ac.uk via UKIP with SMTP (PP) id <g.05640-0@ben.uknet.ac.uk>; Thu, 25 Mar 1993 13:37:19 +0000 Received: from sage.compnews.co.uk by fennel.compnews.co.uk; Thu, 25 Mar 93 13:37:08 GMT Message-Id: <28109.9303251337@sage.compnews.co.uk> From: jsp@compnews.co.uk (Jan-Simon Pendry) Date: Thu, 25 Mar 1993 13:37:05 +0100 In-Reply-To: cgd@postgres.berkeley.edu's message as of Mar 25, 5:32am. Phone-Number-1: +44 430 432450 Phone-Number-2: +44 430 432480 x20 Fax-Number: +44 430 432022 X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: cgd@postgres.berkeley.edu Subject: Re: fdesc/kernfs/etc code... You may put this copyright message on the source code: /* * Copyright (c) 1990, 1992 Jan-Simon Pendry * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */
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* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
changed copyright notice thanks to following statement: Return-Path: jsp@compnews.co.uk Received: from ben.uknet.ac.uk by postgres.Berkeley.EDU (5.61/1.29) id AA25983; Thu, 25 Mar 93 05:37:37 -0800 Received: from fennel.compnews.co.uk by ben.uknet.ac.uk via UKIP with SMTP (PP) id <g.05640-0@ben.uknet.ac.uk>; Thu, 25 Mar 1993 13:37:19 +0000 Received: from sage.compnews.co.uk by fennel.compnews.co.uk; Thu, 25 Mar 93 13:37:08 GMT Message-Id: <28109.9303251337@sage.compnews.co.uk> From: jsp@compnews.co.uk (Jan-Simon Pendry) Date: Thu, 25 Mar 1993 13:37:05 +0100 In-Reply-To: cgd@postgres.berkeley.edu's message as of Mar 25, 5:32am. Phone-Number-1: +44 430 432450 Phone-Number-2: +44 430 432480 x20 Fax-Number: +44 430 432022 X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: cgd@postgres.berkeley.edu Subject: Re: fdesc/kernfs/etc code... You may put this copyright message on the source code: /* * Copyright (c) 1990, 1992 Jan-Simon Pendry * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
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* @(#)fdesc_vnops.c 8.12 (Berkeley) 8/20/94
*
* #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp #
*/
/*
* /dev/fd Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/kernel.h> /* boottime */
#include <sys/resourcevar.h>
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#include <sys/socketvar.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/dirent.h>
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#include <sys/tty.h>
#include <miscfs/fdesc/fdesc.h>
#include <miscfs/genfs/genfs.h>
#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
#define FDL_WANT 0x01
#define FDL_LOCKED 0x02
static int fdcache_lock;
dev_t devctty;
#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
#endif
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#define NFDCACHE 4
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#define FD_NHASH(ix) \
(&fdhashtbl[(ix) & fdhash])
LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
u_long fdhash;
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int fdesc_lookup __P((void *));
#define fdesc_create genfs_eopnotsupp
#define fdesc_mknod genfs_eopnotsupp
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int fdesc_open __P((void *));
#define fdesc_close genfs_nullop
#define fdesc_access genfs_nullop
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int fdesc_getattr __P((void *));
int fdesc_setattr __P((void *));
int fdesc_read __P((void *));
int fdesc_write __P((void *));
int fdesc_ioctl __P((void *));
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int fdesc_poll __P((void *));
#define fdesc_mmap genfs_eopnotsupp
#define fdesc_fsync genfs_nullop
#define fdesc_seek genfs_seek
#define fdesc_remove genfs_eopnotsupp
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int fdesc_link __P((void *));
#define fdesc_rename genfs_eopnotsupp
#define fdesc_mkdir genfs_eopnotsupp
#define fdesc_rmdir genfs_eopnotsupp
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int fdesc_symlink __P((void *));
int fdesc_readdir __P((void *));
int fdesc_readlink __P((void *));
#define fdesc_abortop genfs_abortop
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int fdesc_inactive __P((void *));
int fdesc_reclaim __P((void *));
#define fdesc_lock genfs_nullop
#define fdesc_unlock genfs_nullop
#define fdesc_bmap genfs_badop
#define fdesc_strategy genfs_badop
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int fdesc_print __P((void *));
int fdesc_pathconf __P((void *));
#define fdesc_islocked genfs_nullop
#define fdesc_advlock genfs_eopnotsupp
#define fdesc_blkatoff genfs_eopnotsupp
#define fdesc_valloc genfs_eopnotsupp
#define fdesc_vfree genfs_nullop
#define fdesc_truncate genfs_eopnotsupp
#define fdesc_update genfs_nullop
#define fdesc_bwrite genfs_eopnotsupp
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static int fdesc_attr __P((int, struct vattr *, struct ucred *, struct proc *));
int (**fdesc_vnodeop_p) __P((void *));
struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, fdesc_lookup }, /* lookup */
{ &vop_create_desc, fdesc_create }, /* create */
{ &vop_mknod_desc, fdesc_mknod }, /* mknod */
{ &vop_open_desc, fdesc_open }, /* open */
{ &vop_close_desc, fdesc_close }, /* close */
{ &vop_access_desc, fdesc_access }, /* access */
{ &vop_getattr_desc, fdesc_getattr }, /* getattr */
{ &vop_setattr_desc, fdesc_setattr }, /* setattr */
{ &vop_read_desc, fdesc_read }, /* read */
{ &vop_write_desc, fdesc_write }, /* write */
{ &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */
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{ &vop_poll_desc, fdesc_poll }, /* poll */
{ &vop_mmap_desc, fdesc_mmap }, /* mmap */
{ &vop_fsync_desc, fdesc_fsync }, /* fsync */
{ &vop_seek_desc, fdesc_seek }, /* seek */
{ &vop_remove_desc, fdesc_remove }, /* remove */
{ &vop_link_desc, fdesc_link }, /* link */
{ &vop_rename_desc, fdesc_rename }, /* rename */
{ &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */
{ &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */
{ &vop_symlink_desc, fdesc_symlink }, /* symlink */
{ &vop_readdir_desc, fdesc_readdir }, /* readdir */
{ &vop_readlink_desc, fdesc_readlink }, /* readlink */
{ &vop_abortop_desc, fdesc_abortop }, /* abortop */
{ &vop_inactive_desc, fdesc_inactive }, /* inactive */
{ &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */
{ &vop_lock_desc, fdesc_lock }, /* lock */
{ &vop_unlock_desc, fdesc_unlock }, /* unlock */
{ &vop_bmap_desc, fdesc_bmap }, /* bmap */
{ &vop_strategy_desc, fdesc_strategy }, /* strategy */
{ &vop_print_desc, fdesc_print }, /* print */
{ &vop_islocked_desc, fdesc_islocked }, /* islocked */
{ &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */
{ &vop_advlock_desc, fdesc_advlock }, /* advlock */
{ &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, fdesc_valloc }, /* valloc */
{ &vop_vfree_desc, fdesc_vfree }, /* vfree */
{ &vop_truncate_desc, fdesc_truncate }, /* truncate */
{ &vop_update_desc, fdesc_update }, /* update */
{ &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */
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{ (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL }
};
struct vnodeopv_desc fdesc_vnodeop_opv_desc =
{ &fdesc_vnodeop_p, fdesc_vnodeop_entries };
/*
* Initialise cache headers
*/
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void
fdesc_init()
{
int cttymajor;
/* locate the major number */
for (cttymajor = 0; cttymajor < nchrdev; cttymajor++)
if (cdevsw[cttymajor].d_open == cttyopen)
break;
devctty = makedev(cttymajor, 0);
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fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
}
int
fdesc_allocvp(ftype, ix, mp, vpp)
fdntype ftype;
int ix;
struct mount *mp;
struct vnode **vpp;
{
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struct fdhashhead *fc;
struct fdescnode *fd;
int error = 0;
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fc = FD_NHASH(ix);
loop:
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for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
if (vget(fd->fd_vnode, 0))
goto loop;
*vpp = fd->fd_vnode;
return (error);
}
}
/*
* otherwise lock the array while we call getnewvnode
* since that can block.
*/
if (fdcache_lock & FDL_LOCKED) {
fdcache_lock |= FDL_WANT;
sleep((caddr_t) &fdcache_lock, PINOD);
goto loop;
}
fdcache_lock |= FDL_LOCKED;
error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
if (error)
goto out;
MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
(*vpp)->v_data = fd;
fd->fd_vnode = *vpp;
fd->fd_type = ftype;
fd->fd_fd = -1;
fd->fd_link = 0;
fd->fd_ix = ix;
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LIST_INSERT_HEAD(fc, fd, fd_hash);
out:;
fdcache_lock &= ~FDL_LOCKED;
if (fdcache_lock & FDL_WANT) {
fdcache_lock &= ~FDL_WANT;
wakeup((caddr_t) &fdcache_lock);
}
return (error);
}
/*
* vp is the current namei directory
* ndp is the name to locate in that directory...
*/
int
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fdesc_lookup(v)
void *v;
{
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
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} */ *ap = v;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
const char *pname;
struct proc *p;
int nfiles;
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unsigned fd = 0;
int error;
struct vnode *fvp;
char *ln;
pname = ap->a_cnp->cn_nameptr;
if (ap->a_cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
VREF(dvp);
VOP_LOCK(dvp);
return (0);
}
p = ap->a_cnp->cn_proc;
nfiles = p->p_fd->fd_nfiles;
switch (VTOFDESC(dvp)->fd_type) {
default:
case Flink:
case Fdesc:
case Fctty:
error = ENOTDIR;
goto bad;
case Froot:
if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) {
error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
if (error)
goto bad;
*vpp = fvp;
fvp->v_type = VDIR;
VOP_LOCK(fvp);
return (0);
}
if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) {
struct vnode *ttyvp = cttyvp(p);
if (ttyvp == NULL) {
error = ENXIO;
goto bad;
}
error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp);
if (error)
goto bad;
*vpp = fvp;
fvp->v_type = VCHR;
VOP_LOCK(fvp);
return (0);
}
ln = 0;
switch (ap->a_cnp->cn_namelen) {
case 5:
if (bcmp(pname, "stdin", 5) == 0) {
ln = "fd/0";
fd = FD_STDIN;
}
break;
case 6:
if (bcmp(pname, "stdout", 6) == 0) {
ln = "fd/1";
fd = FD_STDOUT;
} else
if (bcmp(pname, "stderr", 6) == 0) {
ln = "fd/2";
fd = FD_STDERR;
}
break;
}
if (ln) {
error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
if (error)
goto bad;
VTOFDESC(fvp)->fd_link = ln;
*vpp = fvp;
fvp->v_type = VLNK;
VOP_LOCK(fvp);
return (0);
} else {
error = ENOENT;
goto bad;
}
/* FALL THROUGH */
case Fdevfd:
if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) {
error = fdesc_root(dvp->v_mount, vpp);
return (error);
}
fd = 0;
while (*pname >= '0' && *pname <= '9') {
fd = 10 * fd + *pname++ - '0';
if (fd >= nfiles)
break;
}
if (*pname != '\0') {
error = ENOENT;
goto bad;
}
if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
error = EBADF;
goto bad;
}
error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
if (error)
goto bad;
VTOFDESC(fvp)->fd_fd = fd;
*vpp = fvp;
return (0);
}
bad:;
*vpp = NULL;
return (error);
}
int
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fdesc_open(v)
void *v;
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
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} */ *ap = v;
struct vnode *vp = ap->a_vp;
switch (VTOFDESC(vp)->fd_type) {
case Fdesc:
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/*
* XXX Kludge: set p->p_dupfd to contain the value of the
* the file descriptor being sought for duplication. The error
* return ensures that the vnode for this device will be
* released by vn_open. Open will detect this special error and
* take the actions in dupfdopen. Other callers of vn_open or
* VOP_OPEN will simply report the error.
*/
ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
return (ENODEV);
case Fctty:
return (cttyopen(devctty, ap->a_mode, 0, ap->a_p));
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case Froot:
case Fdevfd:
case Flink:
break;
}
return (0);
}
static int
fdesc_attr(fd, vap, cred, p)
int fd;
struct vattr *vap;
struct ucred *cred;
struct proc *p;
{
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct stat stb;
int error;
if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
return (EBADF);
switch (fp->f_type) {
case DTYPE_VNODE:
error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
if (error == 0 && vap->va_type == VDIR) {
/*
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* directories can cause loops in the namespace,
* so turn off the 'x' bits to avoid trouble.
*/
vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
}
break;
case DTYPE_SOCKET:
error = soo_stat((struct socket *)fp->f_data, &stb);
if (error == 0) {
vattr_null(vap);
vap->va_type = VSOCK;
vap->va_mode = stb.st_mode;
vap->va_nlink = stb.st_nlink;
vap->va_uid = stb.st_uid;
vap->va_gid = stb.st_gid;
vap->va_fsid = stb.st_dev;
vap->va_fileid = stb.st_ino;
vap->va_size = stb.st_size;
vap->va_blocksize = stb.st_blksize;
vap->va_atime = stb.st_atimespec;
vap->va_mtime = stb.st_mtimespec;
vap->va_ctime = stb.st_ctimespec;
vap->va_gen = stb.st_gen;
vap->va_flags = stb.st_flags;
vap->va_rdev = stb.st_rdev;
vap->va_bytes = stb.st_blocks * stb.st_blksize;
}
break;
default:
panic("fdesc attr");
break;
}
return (error);
}
int
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fdesc_getattr(v)
void *v;
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
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} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
unsigned fd;
int error = 0;
switch (VTOFDESC(vp)->fd_type) {
case Froot:
case Fdevfd:
case Flink:
case Fctty:
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VATTR_NULL(vap);
vap->va_fileid = VTOFDESC(vp)->fd_ix;
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#define R_ALL (S_IRUSR|S_IRGRP|S_IROTH)
#define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH)
#define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH)
switch (VTOFDESC(vp)->fd_type) {
case Flink:
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vap->va_mode = R_ALL|X_ALL;
vap->va_type = VLNK;
vap->va_rdev = 0;
vap->va_nlink = 1;
vap->va_size = strlen(VTOFDESC(vp)->fd_link);
break;
case Fctty:
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vap->va_mode = R_ALL|W_ALL;
vap->va_type = VCHR;
vap->va_rdev = devctty;
vap->va_nlink = 1;
vap->va_size = 0;
break;
default:
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vap->va_mode = R_ALL|X_ALL;
vap->va_type = VDIR;
vap->va_rdev = 0;
vap->va_nlink = 2;
vap->va_size = DEV_BSIZE;
break;
}
vap->va_uid = 0;
vap->va_gid = 0;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
vap->va_blocksize = DEV_BSIZE;
vap->va_atime.tv_sec = boottime.tv_sec;
vap->va_atime.tv_nsec = 0;
vap->va_mtime = vap->va_atime;
vap->va_ctime = vap->va_mtime;
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_bytes = 0;
break;
case Fdesc:
fd = VTOFDESC(vp)->fd_fd;
error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p);
break;
default:
panic("fdesc_getattr");
break;
}
if (error == 0)
vp->v_type = vap->va_type;
return (error);
}
int
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fdesc_setattr(v)
void *v;
{
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
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} */ *ap = v;
struct filedesc *fdp = ap->a_p->p_fd;
struct file *fp;
unsigned fd;
int error;
/*
* Can't mess with the root vnode
*/
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fdesc:
break;
case Fctty:
return (0);
default:
return (EACCES);
}
fd = VTOFDESC(ap->a_vp)->fd_fd;
if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
return (EBADF);
}
/*
* Can setattr the underlying vnode, but not sockets!
*/
switch (fp->f_type) {
case DTYPE_VNODE:
error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p);
break;
case DTYPE_SOCKET:
error = 0;
break;
default:
panic("fdesc setattr");
break;
}
return (error);
}
#define UIO_MX 32
struct fdesc_target {
ino_t ft_fileno;
u_char ft_type;
u_char ft_namlen;
char *ft_name;
} fdesc_targets[] = {
/* NOTE: The name must be less than UIO_MX-16 chars in length */
#define N(s) sizeof(s)-1, s
{ FD_DEVFD, DT_DIR, N("fd") },
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{ FD_STDIN, DT_LNK, N("stdin") },
{ FD_STDOUT, DT_LNK, N("stdout") },
{ FD_STDERR, DT_LNK, N("stderr") },
{ FD_CTTY, DT_UNKNOWN, N("tty") },
#undef N
};
static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]);
int
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fdesc_readdir(v)
void *v;
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
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int *a_eofflag;
off_t *a_cookies;
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int a_ncookies;
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} */ *ap = v;
struct uio *uio = ap->a_uio;
struct dirent d;
struct filedesc *fdp;
int i;
int error;
off_t *cookies = ap->a_cookies;
int ncookies = ap->a_ncookies;
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switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
return (0);
case Fdesc:
return (ENOTDIR);
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default:
break;
}
fdp = uio->uio_procp->p_fd;
if (uio->uio_resid < UIO_MX)
return (EINVAL);
if (uio->uio_offset < 0)
return (EINVAL);
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error = 0;
i = uio->uio_offset;
bzero((caddr_t)&d, UIO_MX);
d.d_reclen = UIO_MX;
if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
struct fdesc_target *ft;
for (ft = &fdesc_targets[i];
uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) {
switch (ft->ft_fileno) {
case FD_CTTY:
if (cttyvp(uio->uio_procp) == NULL)
continue;
break;
case FD_STDIN:
case FD_STDOUT:
case FD_STDERR:
if ((ft->ft_fileno - FD_STDIN) >= fdp->fd_nfiles)
continue;
if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] == NULL)
continue;
break;
}
d.d_fileno = ft->ft_fileno;
d.d_namlen = ft->ft_namlen;
bcopy(ft->ft_name, d.d_name, ft->ft_namlen + 1);
d.d_type = ft->ft_type;
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if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)
break;
if (ncookies-- > 0)
*cookies++ = i + 1;
}
} else {
for (; i - 2 < fdp->fd_nfiles && uio->uio_resid >= UIO_MX;
i++) {
switch (i) {
case 0:
case 1:
d.d_fileno = FD_ROOT; /* XXX */
d.d_namlen = i + 1;
bcopy("..", d.d_name, d.d_namlen);
d.d_name[i + 1] = '\0';
d.d_type = DT_DIR;
break;
default:
if (fdp->fd_ofiles[i - 2] == NULL)
continue;
d.d_fileno = i - 2 + FD_STDIN;
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d.d_namlen = sprintf(d.d_name, "%d", i - 2);
d.d_type = DT_UNKNOWN;
break;
}
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if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)
break;
if (ncookies-- > 0)
*cookies++ = i + 1;
}
}
uio->uio_offset = i;
return (error);
}
int
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fdesc_readlink(v)
void *v;
{
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
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} */ *ap = v;
struct vnode *vp = ap->a_vp;
int error;
if (vp->v_type != VLNK)
return (EPERM);
if (VTOFDESC(vp)->fd_type == Flink) {
char *ln = VTOFDESC(vp)->fd_link;
error = uiomove(ln, strlen(ln), ap->a_uio);
} else {
error = EOPNOTSUPP;
}
return (error);
}
int
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fdesc_read(v)
void *v;
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
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} */ *ap = v;
int error = EOPNOTSUPP;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
error = cttyread(devctty, ap->a_uio, ap->a_ioflag);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
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fdesc_write(v)
void *v;
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
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} */ *ap = v;
int error = EOPNOTSUPP;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
error = cttywrite(devctty, ap->a_uio, ap->a_ioflag);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
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fdesc_ioctl(v)
void *v;
{
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
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} */ *ap = v;
int error = EOPNOTSUPP;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
error = cttyioctl(devctty, ap->a_command, ap->a_data,
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ap->a_fflag, ap->a_p);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
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fdesc_poll(v)
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void *v;
{
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struct vop_poll_args /* {
struct vnode *a_vp;
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int a_events;
struct proc *a_p;
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} */ *ap = v;
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int revents;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
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revents = cttypoll(devctty, ap->a_events, ap->a_p);
break;
default:
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revents = genfs_poll(v);
break;
}
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return (revents);
}
int
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fdesc_inactive(v)
void *v;
{
struct vop_inactive_args /* {
struct vnode *a_vp;
1996-02-10 01:39:56 +03:00
} */ *ap = v;
struct vnode *vp = ap->a_vp;
/*
* Clear out the v_type field to avoid
* nasty things happening in vgone().
*/
vp->v_type = VNON;
return (0);
}
int
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fdesc_reclaim(v)
void *v;
{
struct vop_reclaim_args /* {
struct vnode *a_vp;
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} */ *ap = v;
struct vnode *vp = ap->a_vp;
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struct fdescnode *fd = VTOFDESC(vp);
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LIST_REMOVE(fd, fd_hash);
FREE(vp->v_data, M_TEMP);
vp->v_data = 0;
return (0);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
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int
fdesc_pathconf(v)
void *v;
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
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} */ *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Print out the contents of a /dev/fd vnode.
*/
/* ARGSUSED */
int
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fdesc_print(v)
void *v;
{
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printf("tag VT_NON, fdesc vnode\n");
return (0);
}
int
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fdesc_link(v)
void *v;
{
struct vop_link_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
1996-02-10 01:39:56 +03:00
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}
int
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fdesc_symlink(v)
void *v;
{
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
1996-02-10 01:39:56 +03:00
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}