520 lines
12 KiB
C
520 lines
12 KiB
C
/* $NetBSD: fifo_vnops.c,v 1.16 1995/04/14 23:30:14 mycroft Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)fifo_vnops.c 8.4 (Berkeley) 8/10/94
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/time.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/malloc.h>
|
|
#include <miscfs/fifofs/fifo.h>
|
|
|
|
/*
|
|
* This structure is associated with the FIFO vnode and stores
|
|
* the state associated with the FIFO.
|
|
*/
|
|
struct fifoinfo {
|
|
struct socket *fi_readsock;
|
|
struct socket *fi_writesock;
|
|
long fi_readers;
|
|
long fi_writers;
|
|
};
|
|
|
|
int (**fifo_vnodeop_p)();
|
|
struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
|
|
{ &vop_default_desc, vn_default_error },
|
|
{ &vop_lookup_desc, fifo_lookup }, /* lookup */
|
|
{ &vop_create_desc, fifo_create }, /* create */
|
|
{ &vop_mknod_desc, fifo_mknod }, /* mknod */
|
|
{ &vop_open_desc, fifo_open }, /* open */
|
|
{ &vop_close_desc, fifo_close }, /* close */
|
|
{ &vop_access_desc, fifo_access }, /* access */
|
|
{ &vop_getattr_desc, fifo_getattr }, /* getattr */
|
|
{ &vop_setattr_desc, fifo_setattr }, /* setattr */
|
|
{ &vop_read_desc, fifo_read }, /* read */
|
|
{ &vop_write_desc, fifo_write }, /* write */
|
|
{ &vop_lease_desc, fifo_lease_check }, /* lease */
|
|
{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
|
|
{ &vop_select_desc, fifo_select }, /* select */
|
|
{ &vop_mmap_desc, fifo_mmap }, /* mmap */
|
|
{ &vop_fsync_desc, fifo_fsync }, /* fsync */
|
|
{ &vop_seek_desc, fifo_seek }, /* seek */
|
|
{ &vop_remove_desc, fifo_remove }, /* remove */
|
|
{ &vop_link_desc, fifo_link }, /* link */
|
|
{ &vop_rename_desc, fifo_rename }, /* rename */
|
|
{ &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
|
|
{ &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
|
|
{ &vop_symlink_desc, fifo_symlink }, /* symlink */
|
|
{ &vop_readdir_desc, fifo_readdir }, /* readdir */
|
|
{ &vop_readlink_desc, fifo_readlink }, /* readlink */
|
|
{ &vop_abortop_desc, fifo_abortop }, /* abortop */
|
|
{ &vop_inactive_desc, fifo_inactive }, /* inactive */
|
|
{ &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
|
|
{ &vop_lock_desc, fifo_lock }, /* lock */
|
|
{ &vop_unlock_desc, fifo_unlock }, /* unlock */
|
|
{ &vop_bmap_desc, fifo_bmap }, /* bmap */
|
|
{ &vop_strategy_desc, fifo_strategy }, /* strategy */
|
|
{ &vop_print_desc, fifo_print }, /* print */
|
|
{ &vop_islocked_desc, fifo_islocked }, /* islocked */
|
|
{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
|
|
{ &vop_advlock_desc, fifo_advlock }, /* advlock */
|
|
{ &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */
|
|
{ &vop_valloc_desc, fifo_valloc }, /* valloc */
|
|
{ &vop_vfree_desc, fifo_vfree }, /* vfree */
|
|
{ &vop_truncate_desc, fifo_truncate }, /* truncate */
|
|
{ &vop_update_desc, fifo_update }, /* update */
|
|
{ &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
|
|
{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
|
|
};
|
|
struct vnodeopv_desc fifo_vnodeop_opv_desc =
|
|
{ &fifo_vnodeop_p, fifo_vnodeop_entries };
|
|
|
|
/*
|
|
* Trivial lookup routine that always fails.
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_lookup(ap)
|
|
struct vop_lookup_args /* {
|
|
struct vnode * a_dvp;
|
|
struct vnode ** a_vpp;
|
|
struct componentname * a_cnp;
|
|
} */ *ap;
|
|
{
|
|
|
|
*ap->a_vpp = NULL;
|
|
return (ENOTDIR);
|
|
}
|
|
|
|
/*
|
|
* Open called to set up a new instance of a fifo or
|
|
* to find an active instance of a fifo.
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_open(ap)
|
|
struct vop_open_args /* {
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *vp = ap->a_vp;
|
|
register struct fifoinfo *fip;
|
|
struct socket *rso, *wso;
|
|
int error;
|
|
static char openstr[] = "fifo";
|
|
|
|
if ((fip = vp->v_fifoinfo) == NULL) {
|
|
MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
|
|
vp->v_fifoinfo = fip;
|
|
if (error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0)) {
|
|
free(fip, M_VNODE);
|
|
vp->v_fifoinfo = NULL;
|
|
return (error);
|
|
}
|
|
fip->fi_readsock = rso;
|
|
if (error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0)) {
|
|
(void)soclose(rso);
|
|
free(fip, M_VNODE);
|
|
vp->v_fifoinfo = NULL;
|
|
return (error);
|
|
}
|
|
fip->fi_writesock = wso;
|
|
if (error = unp_connect2(wso, rso)) {
|
|
(void)soclose(wso);
|
|
(void)soclose(rso);
|
|
free(fip, M_VNODE);
|
|
vp->v_fifoinfo = NULL;
|
|
return (error);
|
|
}
|
|
fip->fi_readers = fip->fi_writers = 0;
|
|
wso->so_state |= SS_CANTRCVMORE;
|
|
rso->so_state |= SS_CANTSENDMORE;
|
|
}
|
|
if (ap->a_mode & FREAD) {
|
|
if (fip->fi_readers++ == 0) {
|
|
fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
|
|
if (fip->fi_writers > 0)
|
|
wakeup((caddr_t)&fip->fi_writers);
|
|
}
|
|
}
|
|
if (ap->a_mode & FWRITE) {
|
|
if (fip->fi_writers++ == 0) {
|
|
fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
|
|
if (fip->fi_readers > 0)
|
|
wakeup((caddr_t)&fip->fi_readers);
|
|
}
|
|
}
|
|
if (ap->a_mode & FREAD) {
|
|
if (ap->a_mode & O_NONBLOCK) {
|
|
} else {
|
|
while (fip->fi_writers == 0) {
|
|
VOP_UNLOCK(vp);
|
|
error = tsleep((caddr_t)&fip->fi_readers,
|
|
PCATCH | PSOCK, openstr, 0);
|
|
VOP_LOCK(vp);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
if (ap->a_mode & FWRITE) {
|
|
if (ap->a_mode & O_NONBLOCK) {
|
|
if (fip->fi_readers == 0) {
|
|
error = ENXIO;
|
|
goto bad;
|
|
}
|
|
} else {
|
|
while (fip->fi_readers == 0) {
|
|
VOP_UNLOCK(vp);
|
|
error = tsleep((caddr_t)&fip->fi_writers,
|
|
PCATCH | PSOCK, openstr, 0);
|
|
VOP_LOCK(vp);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
bad:
|
|
VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for read
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_read(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
register struct uio *uio = ap->a_uio;
|
|
register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
|
|
int error, startresid;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_READ)
|
|
panic("fifo_read mode");
|
|
#endif
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
rso->so_state |= SS_NBIO;
|
|
startresid = uio->uio_resid;
|
|
VOP_UNLOCK(ap->a_vp);
|
|
error = soreceive(rso, (struct mbuf **)0, uio, (struct mbuf **)0,
|
|
(struct mbuf **)0, (int *)0);
|
|
VOP_LOCK(ap->a_vp);
|
|
/*
|
|
* Clear EOF indication after first such return.
|
|
*/
|
|
if (uio->uio_resid == startresid)
|
|
rso->so_state &= ~SS_CANTRCVMORE;
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
rso->so_state &= ~SS_NBIO;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_write(ap)
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
|
|
int error;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (ap->a_uio->uio_rw != UIO_WRITE)
|
|
panic("fifo_write mode");
|
|
#endif
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
wso->so_state |= SS_NBIO;
|
|
VOP_UNLOCK(ap->a_vp);
|
|
error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0);
|
|
VOP_LOCK(ap->a_vp);
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
wso->so_state &= ~SS_NBIO;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_ioctl(ap)
|
|
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;
|
|
{
|
|
struct file filetmp;
|
|
int error;
|
|
|
|
if (ap->a_command == FIONBIO)
|
|
return (0);
|
|
if (ap->a_fflag & FREAD) {
|
|
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
|
|
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
if (ap->a_fflag & FWRITE) {
|
|
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
|
|
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
fifo_select(ap)
|
|
struct vop_select_args /* {
|
|
struct vnode *a_vp;
|
|
int a_which;
|
|
int a_fflags;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct file filetmp;
|
|
int ready;
|
|
|
|
if (ap->a_fflags & FREAD) {
|
|
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
|
|
ready = soo_select(&filetmp, ap->a_which, ap->a_p);
|
|
if (ready)
|
|
return (ready);
|
|
}
|
|
if (ap->a_fflags & FWRITE) {
|
|
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
|
|
ready = soo_select(&filetmp, ap->a_which, ap->a_p);
|
|
if (ready)
|
|
return (ready);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is a noop, simply returning what one has been given.
|
|
*/
|
|
fifo_bmap(ap)
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
} */ *ap;
|
|
{
|
|
|
|
if (ap->a_vpp != NULL)
|
|
*ap->a_vpp = ap->a_vp;
|
|
if (ap->a_bnp != NULL)
|
|
*ap->a_bnp = ap->a_bn;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* At the moment we do not do any locking.
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_lock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
fifo_unlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
fifo_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *vp = ap->a_vp;
|
|
register struct fifoinfo *fip = vp->v_fifoinfo;
|
|
int error1, error2;
|
|
|
|
if (ap->a_fflag & FREAD) {
|
|
if (--fip->fi_readers == 0)
|
|
socantsendmore(fip->fi_writesock);
|
|
}
|
|
if (ap->a_fflag & FWRITE) {
|
|
if (--fip->fi_writers == 0)
|
|
socantrcvmore(fip->fi_readsock);
|
|
}
|
|
if (vp->v_usecount > 1)
|
|
return (0);
|
|
error1 = soclose(fip->fi_readsock);
|
|
error2 = soclose(fip->fi_writesock);
|
|
FREE(fip, M_VNODE);
|
|
vp->v_fifoinfo = NULL;
|
|
if (error1)
|
|
return (error1);
|
|
return (error2);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a fifo vnode.
|
|
*/
|
|
fifo_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
printf("tag VT_NON");
|
|
fifo_printinfo(ap->a_vp);
|
|
printf("\n");
|
|
}
|
|
|
|
/*
|
|
* Print out internal contents of a fifo vnode.
|
|
*/
|
|
fifo_printinfo(vp)
|
|
struct vnode *vp;
|
|
{
|
|
register struct fifoinfo *fip = vp->v_fifoinfo;
|
|
|
|
printf(", fifo with %d readers and %d writers",
|
|
fip->fi_readers, fip->fi_writers);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to fifo's.
|
|
*/
|
|
fifo_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
register_t *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 failed operation
|
|
*/
|
|
fifo_ebadf()
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Fifo advisory byte-level locks.
|
|
*/
|
|
/* ARGSUSED */
|
|
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 (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* Fifo bad operation
|
|
*/
|
|
fifo_badop()
|
|
{
|
|
|
|
panic("fifo_badop called");
|
|
/* NOTREACHED */
|
|
}
|