/* $OpenBSD: fdesc_vnops.c,v 1.36 2003/09/23 16:51:12 millert Exp $ */ /* $NetBSD: fdesc_vnops.c,v 1.32 1996/04/11 11:24:29 mrg 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. * * 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. 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. * * @(#)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 #include #include #include #include #include /* boottime */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) static struct lock 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 #define NFDCACHE 4 #define FD_NHASH(ix) \ (&fdhashtbl[(ix) & fdhash]) LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; static u_long fdhash; int fdesc_badop(void *); int fdesc_lookup(void *); #define fdesc_create eopnotsupp #define fdesc_mknod eopnotsupp int fdesc_open(void *); #define fdesc_close nullop #define fdesc_access nullop int fdesc_getattr(void *); int fdesc_setattr(void *); int fdesc_read(void *); int fdesc_write(void *); int fdesc_ioctl(void *); int fdesc_poll(void *); #define fdesc_fsync nullop #define fdesc_remove eopnotsupp #define fdesc_revoke vop_generic_revoke int fdesc_link(void *); #define fdesc_rename eopnotsupp #define fdesc_mkdir eopnotsupp #define fdesc_rmdir eopnotsupp int fdesc_symlink(void *); int fdesc_readdir(void *); int fdesc_readlink(void *); int fdesc_inactive(void *); int fdesc_reclaim(void *); #define fdesc_lock vop_generic_lock #define fdesc_unlock vop_generic_unlock #define fdesc_bmap fdesc_badop #define fdesc_strategy fdesc_badop int fdesc_print(void *); int fdesc_pathconf(void *); #define fdesc_islocked vop_generic_islocked #define fdesc_advlock eopnotsupp #define fdesc_bwrite eopnotsupp int (**fdesc_vnodeop_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 */ { &vop_revoke_desc, fdesc_revoke }, /* revoke */ { &vop_poll_desc, fdesc_poll }, /* poll */ { &vop_fsync_desc, fdesc_fsync }, /* fsync */ { &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, vop_generic_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_bwrite_desc, fdesc_bwrite }, /* bwrite */ { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL } }; struct vnodeopv_desc fdesc_vnodeop_opv_desc = { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; /* * Initialise cache headers */ int fdesc_init(vfsp) struct vfsconf *vfsp; { int cttymajor; /* locate the major number */ for (cttymajor = 0; cttymajor < nchrdev; cttymajor++) if (cdevsw[cttymajor].d_open == cttyopen) break; devctty = makedev(cttymajor, 0); fdhashtbl = hashinit(NFDCACHE, M_CACHE, M_WAITOK, &fdhash); lockinit(&fdcache_lock, PVFS, "fdfs", 0, 0); return (0); } int fdesc_allocvp(ftype, ix, mp, vpp) fdntype ftype; int ix; struct mount *mp; struct vnode **vpp; { struct proc *p = curproc; /* XXX */ struct fdhashhead *fc; struct fdescnode *fd; int error = 0; if ((error = lockmgr(&fdcache_lock, LK_EXCLUSIVE, NULL, p)) != 0) return error; fc = FD_NHASH(ix); loop: LIST_FOREACH(fd, fc, fd_hash) { if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { if (vget(fd->fd_vnode, 0, p)) goto loop; *vpp = fd->fd_vnode; goto out; } } 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; LIST_INSERT_HEAD(fc, fd, fd_hash); out: lockmgr(&fdcache_lock, LK_RELEASE, NULL, p); return (error); } /* * vp is the current namei directory * ndp is the name to locate in that directory... */ int fdesc_lookup(v) void *v; { struct vop_lookup_args /* { struct vnode * a_dvp; struct vnode ** a_vpp; struct componentname * a_cnp; } */ *ap = v; struct vnode **vpp = ap->a_vpp; struct vnode *dvp = ap->a_dvp; struct componentname *cnp = ap->a_cnp; char *pname = cnp->cn_nameptr; struct proc *p = cnp->cn_proc; int nfiles = p->p_fd->fd_nfiles; unsigned fd = 0; int error; struct vnode *fvp; char *ln; if (cnp->cn_namelen == 1 && *pname == '.') { *vpp = dvp; VREF(dvp); return (0); } switch (VTOFDESC(dvp)->fd_type) { default: case Flink: case Fdesc: case Fctty: error = ENOTDIR; goto bad; case Froot: if (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; goto good; } if (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; goto good; } ln = 0; switch (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; goto good; } else { error = ENOENT; goto bad; } /* FALL THROUGH */ case Fdevfd: if (cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { VOP_UNLOCK(dvp, 0, p); cnp->cn_flags |= PDIRUNLOCK; error = fdesc_root(dvp->v_mount, vpp); if (error) goto bad; /* If we're at the last component and need the * parent locked, undo the unlock above. */ if (((~cnp->cn_flags & (ISLASTCN | LOCKPARENT)) == 0) && ((error = vn_lock(dvp, LK_EXCLUSIVE, p)) == 0)) cnp->cn_flags &= ~PDIRUNLOCK; 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_getfile(p->p_fd, 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; goto good; } bad: *vpp = NULL; return (error); good: /* * As "." was special cased above, we now unlock the parent if we're * supposed to. We're only supposed to not unlock if this is the * last component, and the caller requested LOCKPARENT. So if either * condition is false, unlock. */ if (((~cnp->cn_flags) & (ISLASTCN | LOCKPARENT)) != 0) { VOP_UNLOCK(dvp, 0, p); cnp->cn_flags |= PDIRUNLOCK; } return (0); } int fdesc_open(v) void *v; { struct vop_open_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; switch (VTOFDESC(vp)->fd_type) { case Fdesc: /* * 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)); case Froot: case Fdevfd: case Flink: break; } return (0); } int 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; } */ *ap = v; struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; unsigned int fd; struct stat stb; struct filedesc *fdp; struct file *fp; int error = 0; switch (VTOFDESC(vp)->fd_type) { case Froot: case Fdevfd: case Flink: case Fctty: bzero((caddr_t) vap, sizeof(*vap)); vattr_null(vap); vap->va_fileid = VTOFDESC(vp)->fd_ix; #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: 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: 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: 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; fdp = ap->a_p->p_fd; if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); memset(&stb, 0, sizeof(stb)); FREF(fp); error = (*fp->f_ops->fo_stat)(fp, &stb, ap->a_p); FRELE(fp); if (error != 0) break; vattr_null(vap); vap->va_type = IFTOVT(stb.st_mode); vap->va_mode = stb.st_mode; /* * directories can cause loops in the namespace, * so turn off the 'x' bits to avoid trouble. */ if (vap->va_type == VDIR) vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 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_getattr"); break; } if (error == 0) vp->v_type = vap->va_type; return (error); } int 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; } */ *ap = v; struct vattr *vap = ap->a_vap; struct proc *p = ap->a_p; struct vnode *vp; struct file *fp; int error; /* * Can't mess with the root vnode */ switch (VTOFDESC(ap->a_vp)->fd_type) { case Fdesc: break; case Fctty: if (vap->va_flags != VNOVAL) return (EOPNOTSUPP); return (0); default: return (EACCES); } if ((error = getvnode(p->p_fd, VTOFDESC(ap->a_vp)->fd_fd, &fp)) != 0) { /* * getvnode returns EINVAL if the file is not a vnode. * We siltently drop all changes except chflags when that * happens. */ if (error == EINVAL) { if (vap->va_flags == VNOVAL) error = 0; else error = EOPNOTSUPP; } return (error); } vp = (struct vnode *)fp->f_data; if (vp->v_mount->mnt_flag & MNT_RDONLY) { error = EROFS; goto out; } /* * Directories can cause deadlocks. */ if (vp->v_type == VDIR) { error = EOPNOTSUPP; goto out; } vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, p); error = VOP_SETATTR(vp, vap, ap->a_cred, p); VOP_UNLOCK(vp, 0, p); out: FRELE(fp); 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") }, { 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 fdesc_readdir(v) void *v; { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; int *a_ncookies; u_long **a_cookies; } */ *ap = v; struct uio *uio = ap->a_uio; struct dirent d; struct filedesc *fdp; int i; int error; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: return (0); case Fdesc: return (ENOTDIR); default: break; } fdp = uio->uio_procp->p_fd; if (uio->uio_resid < UIO_MX) return (EINVAL); error = 0; i = uio->uio_offset; if (i < 0) return (EINVAL); 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 (fd_getfile(fdp, 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; if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) break; } } 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 (fd_getfile(fdp, i - 2) == NULL) continue; d.d_fileno = i - 2 + FD_STDIN; d.d_namlen = snprintf(d.d_name, sizeof d.d_name, "%d", i - 2); d.d_type = DT_UNKNOWN; break; } if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) break; } } uio->uio_offset = i; return (error); } int fdesc_readlink(v) void *v; { struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *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 fdesc_read(v) void *v; { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *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 fdesc_write(v) void *v; { struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *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 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; } */ *ap = v; int error = EOPNOTSUPP; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: error = cttyioctl(devctty, ap->a_command, ap->a_data, ap->a_fflag, ap->a_p); break; default: error = EOPNOTSUPP; break; } return (error); } int fdesc_poll(v) void *v; { struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct proc *a_p; } */ *ap = v; int revents; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: revents = cttypoll(devctty, ap->a_events, ap->a_p); break; default: revents = ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); break; } return (revents); } int fdesc_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; /* * Clear out the v_type field to avoid * nasty things happening in vgone(). */ VOP_UNLOCK(vp, 0, ap->a_p); vp->v_type = VNON; return (0); } int fdesc_reclaim(v) void *v; { struct vop_reclaim_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct fdescnode *fd = VTOFDESC(vp); 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. */ int fdesc_pathconf(v) void *v; { struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *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 fdesc_print(v) void *v; { printf("tag VT_NON, fdesc vnode\n"); return (0); } int fdesc_link(v) void *v; { struct vop_link_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } int 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; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } /* * /dev/fd "should never get here" operation */ /*ARGSUSED*/ int fdesc_badop(v) void *v; { panic("fdesc: bad op"); /* NOTREACHED */ }