538 lines
13 KiB
C
538 lines
13 KiB
C
/*
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* Copyright (c) 1990, 1993, 1995
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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 8.10 (Berkeley) 5/27/95
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* $Id: fifo_vnops.c,v 1.42 1998/02/04 22:32:45 eivind Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/unistd.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.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/filio.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/poll.h>
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#include <sys/un.h>
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#include <miscfs/fifofs/fifo.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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static int fifo_badop __P((void));
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static int fifo_print __P((struct vop_print_args *));
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static int fifo_lookup __P((struct vop_lookup_args *));
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static int fifo_open __P((struct vop_open_args *));
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static int fifo_close __P((struct vop_close_args *));
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static int fifo_read __P((struct vop_read_args *));
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static int fifo_write __P((struct vop_write_args *));
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static int fifo_ioctl __P((struct vop_ioctl_args *));
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static int fifo_poll __P((struct vop_poll_args *));
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static int fifo_inactive __P((struct vop_inactive_args *));
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static int fifo_bmap __P((struct vop_bmap_args *));
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static int fifo_pathconf __P((struct vop_pathconf_args *));
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static int fifo_advlock __P((struct vop_advlock_args *));
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vop_t **fifo_vnodeop_p;
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static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) vop_defaultop },
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{ &vop_abortop_desc, (vop_t *) fifo_badop },
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{ &vop_access_desc, (vop_t *) vop_ebadf },
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{ &vop_advlock_desc, (vop_t *) fifo_advlock },
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{ &vop_bmap_desc, (vop_t *) fifo_bmap },
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{ &vop_close_desc, (vop_t *) fifo_close },
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{ &vop_create_desc, (vop_t *) fifo_badop },
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{ &vop_getattr_desc, (vop_t *) vop_ebadf },
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{ &vop_inactive_desc, (vop_t *) fifo_inactive },
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{ &vop_ioctl_desc, (vop_t *) fifo_ioctl },
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{ &vop_lease_desc, (vop_t *) vop_null },
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{ &vop_link_desc, (vop_t *) fifo_badop },
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{ &vop_lookup_desc, (vop_t *) fifo_lookup },
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{ &vop_mkdir_desc, (vop_t *) fifo_badop },
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{ &vop_mknod_desc, (vop_t *) fifo_badop },
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{ &vop_open_desc, (vop_t *) fifo_open },
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{ &vop_pathconf_desc, (vop_t *) fifo_pathconf },
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{ &vop_poll_desc, (vop_t *) fifo_poll },
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{ &vop_print_desc, (vop_t *) fifo_print },
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{ &vop_read_desc, (vop_t *) fifo_read },
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{ &vop_readdir_desc, (vop_t *) fifo_badop },
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{ &vop_readlink_desc, (vop_t *) fifo_badop },
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{ &vop_reallocblks_desc, (vop_t *) fifo_badop },
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{ &vop_reclaim_desc, (vop_t *) vop_null },
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{ &vop_remove_desc, (vop_t *) fifo_badop },
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{ &vop_rename_desc, (vop_t *) fifo_badop },
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{ &vop_rmdir_desc, (vop_t *) fifo_badop },
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{ &vop_setattr_desc, (vop_t *) vop_ebadf },
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{ &vop_symlink_desc, (vop_t *) fifo_badop },
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{ &vop_write_desc, (vop_t *) fifo_write },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc fifo_vnodeop_opv_desc =
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{ &fifo_vnodeop_p, fifo_vnodeop_entries };
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VNODEOP_SET(fifo_vnodeop_opv_desc);
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int
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fifo_vnoperate(ap)
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struct vop_generic_args /* {
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struct vnodeop_desc *a_desc;
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<other random data follows, presumably>
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} */ *ap;
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{
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return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
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}
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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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static int
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fifo_lookup(ap)
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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;
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{
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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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static int
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fifo_open(ap)
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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;
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{
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struct vnode *vp = ap->a_vp;
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struct fifoinfo *fip;
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struct proc *p = ap->a_p;
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struct socket *rso, *wso;
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int error;
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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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error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_p);
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if (error) {
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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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error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_p);
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if (error) {
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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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error = unp_connect2(wso, rso);
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if (error) {
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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_snd.sb_lowat = PIPE_BUF;
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rso->so_state |= SS_CANTRCVMORE;
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}
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if (ap->a_mode & FREAD) {
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fip->fi_readers++;
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if (fip->fi_readers == 1) {
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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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fip->fi_writers++;
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if (fip->fi_writers == 1) {
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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) && (ap->a_mode & O_NONBLOCK) == 0) {
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while (fip->fi_writers == 0) {
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VOP_UNLOCK(vp, 0, p);
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error = tsleep((caddr_t)&fip->fi_readers,
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PCATCH | PSOCK, "fifoor", 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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if (error)
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goto bad;
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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, 0, p);
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error = tsleep((caddr_t)&fip->fi_writers,
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PCATCH | PSOCK, "fifoow", 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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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, 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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static int
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fifo_read(ap)
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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;
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{
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struct uio *uio = ap->a_uio;
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struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
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struct proc *p = uio->uio_procp;
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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, 0, p);
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error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
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(struct mbuf **)0, (int *)0);
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vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
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if (ap->a_ioflag & IO_NDELAY)
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rso->so_state &= ~SS_NBIO;
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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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static int
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fifo_write(ap)
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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;
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{
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struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
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struct proc *p = ap->a_uio->uio_procp;
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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, 0, p);
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error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
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(struct mbuf *)0, 0, p);
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vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
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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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static int
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fifo_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int 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;
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{
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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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static int
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fifo_poll(ap)
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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 ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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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_cred,
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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_cred,
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ap->a_p);
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}
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return (revents);
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}
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static int
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fifo_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap;
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{
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VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
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return (0);
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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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static int
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fifo_bmap(ap)
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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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int *a_runp;
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int *a_runb;
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} */ *ap;
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{
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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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if (ap->a_runp != NULL)
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*ap->a_runp = 0;
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if (ap->a_runb != NULL)
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*ap->a_runb = 0;
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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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static int
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fifo_close(ap)
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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;
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{
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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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fip->fi_readers--;
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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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fip->fi_writers--;
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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 internal contents of a fifo vnode.
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*/
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int
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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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return (0);
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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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static int
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fifo_print(ap)
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struct vop_print_args /* {
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struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
printf("tag VT_NON");
|
|
fifo_printinfo(ap->a_vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to fifo's.
|
|
*/
|
|
int
|
|
fifo_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Fifo advisory byte-level locks.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fifo_advlock(ap)
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Fifo bad operation
|
|
*/
|
|
static int
|
|
fifo_badop()
|
|
{
|
|
|
|
panic("fifo_badop called");
|
|
/* NOTREACHED */
|
|
}
|