508 lines
12 KiB
C
508 lines
12 KiB
C
/* $NetBSD: fifo_vnops.c,v 1.23 1997/05/18 12:19:29 kleink Exp $ */
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fifo_vnops.c 8.4 (Berkeley) 8/10/94
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/time.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/un.h>
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#include <sys/poll.h>
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#include <miscfs/fifofs/fifo.h>
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#include <miscfs/genfs/genfs.h>
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/*
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* This structure is associated with the FIFO vnode and stores
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* the state associated with the FIFO.
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*/
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struct fifoinfo {
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struct socket *fi_readsock;
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struct socket *fi_writesock;
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long fi_readers;
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long fi_writers;
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};
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int (**fifo_vnodeop_p) __P((void *));
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struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_lookup_desc, fifo_lookup }, /* lookup */
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{ &vop_create_desc, fifo_create }, /* create */
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{ &vop_mknod_desc, fifo_mknod }, /* mknod */
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{ &vop_open_desc, fifo_open }, /* open */
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{ &vop_close_desc, fifo_close }, /* close */
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{ &vop_access_desc, fifo_access }, /* access */
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{ &vop_getattr_desc, fifo_getattr }, /* getattr */
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{ &vop_setattr_desc, fifo_setattr }, /* setattr */
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{ &vop_read_desc, fifo_read }, /* read */
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{ &vop_write_desc, fifo_write }, /* write */
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{ &vop_lease_desc, fifo_lease_check }, /* lease */
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{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
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{ &vop_poll_desc, fifo_poll }, /* poll */
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{ &vop_mmap_desc, fifo_mmap }, /* mmap */
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{ &vop_fsync_desc, fifo_fsync }, /* fsync */
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{ &vop_seek_desc, fifo_seek }, /* seek */
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{ &vop_remove_desc, fifo_remove }, /* remove */
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{ &vop_link_desc, fifo_link }, /* link */
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{ &vop_rename_desc, fifo_rename }, /* rename */
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{ &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
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{ &vop_symlink_desc, fifo_symlink }, /* symlink */
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{ &vop_readdir_desc, fifo_readdir }, /* readdir */
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{ &vop_readlink_desc, fifo_readlink }, /* readlink */
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{ &vop_abortop_desc, fifo_abortop }, /* abortop */
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{ &vop_inactive_desc, fifo_inactive }, /* inactive */
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{ &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
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{ &vop_lock_desc, fifo_lock }, /* lock */
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{ &vop_unlock_desc, fifo_unlock }, /* unlock */
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{ &vop_bmap_desc, fifo_bmap }, /* bmap */
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{ &vop_strategy_desc, fifo_strategy }, /* strategy */
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{ &vop_print_desc, fifo_print }, /* print */
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{ &vop_islocked_desc, fifo_islocked }, /* islocked */
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{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
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{ &vop_advlock_desc, fifo_advlock }, /* advlock */
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{ &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, fifo_valloc }, /* valloc */
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{ &vop_vfree_desc, fifo_vfree }, /* vfree */
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{ &vop_truncate_desc, fifo_truncate }, /* truncate */
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{ &vop_update_desc, fifo_update }, /* update */
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{ &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
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{ (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL }
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};
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struct vnodeopv_desc fifo_vnodeop_opv_desc =
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{ &fifo_vnodeop_p, fifo_vnodeop_entries };
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/*
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* Trivial lookup routine that always fails.
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*/
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/* ARGSUSED */
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int
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fifo_lookup(v)
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void *v;
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{
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struct vop_lookup_args /* {
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struct vnode * a_dvp;
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struct vnode ** a_vpp;
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struct componentname * a_cnp;
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} */ *ap = v;
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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}
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/*
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* Open called to set up a new instance of a fifo or
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* to find an active instance of a fifo.
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*/
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/* ARGSUSED */
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int
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fifo_open(v)
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void *v;
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{
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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register struct vnode *vp = ap->a_vp;
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register struct fifoinfo *fip;
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struct socket *rso, *wso;
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int error;
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static char openstr[] = "fifo";
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if ((fip = vp->v_fifoinfo) == NULL) {
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MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
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vp->v_fifoinfo = fip;
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if ((error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0)) != 0) {
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_readsock = rso;
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if ((error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0)) != 0) {
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(void)soclose(rso);
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_writesock = wso;
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if ((error = unp_connect2(wso, rso)) != 0) {
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(void)soclose(wso);
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(void)soclose(rso);
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_readers = fip->fi_writers = 0;
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wso->so_state |= SS_CANTRCVMORE;
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rso->so_state |= SS_CANTSENDMORE;
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}
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if (ap->a_mode & FREAD) {
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if (fip->fi_readers++ == 0) {
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fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
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if (fip->fi_writers > 0)
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wakeup((caddr_t)&fip->fi_writers);
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}
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}
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if (ap->a_mode & FWRITE) {
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if (fip->fi_writers++ == 0) {
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fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
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if (fip->fi_readers > 0)
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wakeup((caddr_t)&fip->fi_readers);
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}
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}
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if (ap->a_mode & FREAD) {
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if (ap->a_mode & O_NONBLOCK) {
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} else {
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while (fip->fi_writers == 0) {
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VOP_UNLOCK(vp);
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error = tsleep((caddr_t)&fip->fi_readers,
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PCATCH | PSOCK, openstr, 0);
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VOP_LOCK(vp);
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if (error)
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goto bad;
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}
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}
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}
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if (ap->a_mode & FWRITE) {
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if (ap->a_mode & O_NONBLOCK) {
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if (fip->fi_readers == 0) {
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error = ENXIO;
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goto bad;
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}
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} else {
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while (fip->fi_readers == 0) {
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VOP_UNLOCK(vp);
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error = tsleep((caddr_t)&fip->fi_writers,
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PCATCH | PSOCK, openstr, 0);
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VOP_LOCK(vp);
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if (error)
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goto bad;
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}
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}
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}
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return (0);
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bad:
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VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
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return (error);
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}
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/*
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* Vnode op for read
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*/
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/* ARGSUSED */
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int
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fifo_read(v)
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void *v;
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{
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap = v;
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register struct uio *uio = ap->a_uio;
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register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
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int error, startresid;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("fifo_read mode");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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if (ap->a_ioflag & IO_NDELAY)
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rso->so_state |= SS_NBIO;
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startresid = uio->uio_resid;
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VOP_UNLOCK(ap->a_vp);
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error = soreceive(rso, (struct mbuf **)0, uio, (struct mbuf **)0,
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(struct mbuf **)0, (int *)0);
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VOP_LOCK(ap->a_vp);
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/*
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* Clear EOF indication after first such return.
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*/
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if (uio->uio_resid == startresid)
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rso->so_state &= ~SS_CANTRCVMORE;
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if (ap->a_ioflag & IO_NDELAY) {
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rso->so_state &= ~SS_NBIO;
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if (error == EWOULDBLOCK &&
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ap->a_vp->v_fifoinfo->fi_writers == 0)
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error = 0;
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}
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return (error);
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}
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/*
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* Vnode op for write
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*/
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/* ARGSUSED */
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int
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fifo_write(v)
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void *v;
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{
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap = v;
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struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
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int error;
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#ifdef DIAGNOSTIC
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if (ap->a_uio->uio_rw != UIO_WRITE)
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panic("fifo_write mode");
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#endif
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if (ap->a_ioflag & IO_NDELAY)
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wso->so_state |= SS_NBIO;
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VOP_UNLOCK(ap->a_vp);
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error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0);
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VOP_LOCK(ap->a_vp);
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if (ap->a_ioflag & IO_NDELAY)
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wso->so_state &= ~SS_NBIO;
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return (error);
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}
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/*
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* Device ioctl operation.
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*/
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/* ARGSUSED */
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int
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fifo_ioctl(v)
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void *v;
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{
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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u_long a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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struct file filetmp;
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int error;
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if (ap->a_command == FIONBIO)
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return (0);
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if (ap->a_fflag & FREAD) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
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error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
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if (error)
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return (error);
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}
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if (ap->a_fflag & FWRITE) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
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error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
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if (error)
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return (error);
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}
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return (0);
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}
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/* ARGSUSED */
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int
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fifo_poll(v)
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void *v;
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{
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct proc *a_p;
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} */ *ap = v;
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struct file filetmp;
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int revents = 0;
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if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
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if (filetmp.f_data)
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revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
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}
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if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
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if (filetmp.f_data)
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revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
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}
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return (revents);
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}
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/*
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* This is a noop, simply returning what one has been given.
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*/
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int
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fifo_bmap(v)
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void *v;
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{
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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} */ *ap = v;
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if (ap->a_vpp != NULL)
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*ap->a_vpp = ap->a_vp;
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if (ap->a_bnp != NULL)
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*ap->a_bnp = ap->a_bn;
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return (0);
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}
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/*
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* At the moment we do not do any locking.
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*/
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/* ARGSUSED */
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int
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fifo_lock(v)
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void *v;
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{
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return (0);
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}
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/* ARGSUSED */
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int
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fifo_unlock(v)
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void *v;
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{
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return (0);
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}
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/*
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* Device close routine
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*/
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/* ARGSUSED */
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int
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fifo_close(v)
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void *v;
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{
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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register struct vnode *vp = ap->a_vp;
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register struct fifoinfo *fip = vp->v_fifoinfo;
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int error1, error2;
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if (ap->a_fflag & FREAD) {
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if (--fip->fi_readers == 0)
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socantsendmore(fip->fi_writesock);
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}
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if (ap->a_fflag & FWRITE) {
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if (--fip->fi_writers == 0)
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socantrcvmore(fip->fi_readsock);
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}
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if (vp->v_usecount > 1)
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return (0);
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error1 = soclose(fip->fi_readsock);
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error2 = soclose(fip->fi_writesock);
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FREE(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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if (error1)
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return (error1);
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return (error2);
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}
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/*
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* Print out the contents of a fifo vnode.
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*/
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int
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fifo_print(v)
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void *v;
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{
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struct vop_print_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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printf("tag VT_NON");
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fifo_printinfo(ap->a_vp);
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printf("\n");
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return 0;
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}
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/*
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* Print out internal contents of a fifo vnode.
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*/
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void
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fifo_printinfo(vp)
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struct vnode *vp;
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{
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register struct fifoinfo *fip = vp->v_fifoinfo;
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printf(", fifo with %ld readers and %ld writers",
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fip->fi_readers, fip->fi_writers);
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}
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/*
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* Return POSIX pathconf information applicable to fifo's.
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*/
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int
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fifo_pathconf(v)
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void *v;
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{
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struct vop_pathconf_args /* {
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struct vnode *a_vp;
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int a_name;
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register_t *a_retval;
|
|
} */ *ap = v;
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|