/*
* Copyright (c) 1990, 1993, 1995
* 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 8.10 (Berkeley) 5/27/95
* $Id: fifo_vnops.c,v 1.29 1997/10/15 09:21:00 phk Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/unistd.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/filio.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/poll.h>
#include <sys/un.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;
};
static int fifo_ebadf __P((void));
static int fifo_print __P((struct vop_print_args *));
vop_t **fifo_vnodeop_p;
static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) vn_default_error },
{ &vop_abortop_desc, (vop_t *) fifo_abortop },
{ &vop_access_desc, (vop_t *) fifo_access },
{ &vop_advlock_desc, (vop_t *) fifo_advlock },
{ &vop_blkatoff_desc, (vop_t *) fifo_blkatoff },
{ &vop_bmap_desc, (vop_t *) fifo_bmap },
{ &vop_bwrite_desc, (vop_t *) fifo_bwrite },
{ &vop_close_desc, (vop_t *) fifo_close },
{ &vop_create_desc, (vop_t *) fifo_create },
{ &vop_fsync_desc, (vop_t *) fifo_fsync },
{ &vop_getattr_desc, (vop_t *) fifo_getattr },
{ &vop_inactive_desc, (vop_t *) fifo_inactive },
{ &vop_ioctl_desc, (vop_t *) fifo_ioctl },
{ &vop_islocked_desc, (vop_t *) fifo_islocked },
{ &vop_lease_desc, (vop_t *) fifo_lease_check },
{ &vop_link_desc, (vop_t *) fifo_link },
{ &vop_lock_desc, (vop_t *) fifo_lock },
{ &vop_lookup_desc, (vop_t *) fifo_lookup },
{ &vop_mkdir_desc, (vop_t *) fifo_mkdir },
{ &vop_mknod_desc, (vop_t *) fifo_mknod },
{ &vop_mmap_desc, (vop_t *) fifo_mmap },
{ &vop_open_desc, (vop_t *) fifo_open },
{ &vop_pathconf_desc, (vop_t *) fifo_pathconf },
{ &vop_poll_desc, (vop_t *) fifo_poll },
{ &vop_print_desc, (vop_t *) fifo_print },
{ &vop_read_desc, (vop_t *) fifo_read },
{ &vop_readdir_desc, (vop_t *) fifo_readdir },
{ &vop_readlink_desc, (vop_t *) fifo_readlink },
{ &vop_reclaim_desc, (vop_t *) fifo_reclaim },
{ &vop_remove_desc, (vop_t *) fifo_remove },
{ &vop_rename_desc, (vop_t *) fifo_rename },
{ &vop_revoke_desc, (vop_t *) fifo_revoke },
{ &vop_rmdir_desc, (vop_t *) fifo_rmdir },
{ &vop_seek_desc, (vop_t *) fifo_seek },
{ &vop_setattr_desc, (vop_t *) fifo_setattr },
{ &vop_strategy_desc, (vop_t *) fifo_strategy },
{ &vop_symlink_desc, (vop_t *) fifo_symlink },
{ &vop_truncate_desc, (vop_t *) fifo_truncate },
{ &vop_unlock_desc, (vop_t *) fifo_unlock },
{ &vop_update_desc, (vop_t *) fifo_update },
{ &vop_valloc_desc, (vop_t *) fifo_valloc },
{ &vop_vfree_desc, (vop_t *) fifo_vfree },
{ &vop_write_desc, (vop_t *) fifo_write },
{ NULL, NULL }
};
static struct vnodeopv_desc fifo_vnodeop_opv_desc =
{ &fifo_vnodeop_p, fifo_vnodeop_entries };
VNODEOP_SET(fifo_vnodeop_opv_desc);
/*
* Trivial lookup routine that always fails.
*/
/* ARGSUSED */
int
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 */
int
fifo_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct fifoinfo *fip;
struct proc *p = ap->a_p;
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;
error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_p);
if (error) {
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_readsock = rso;
error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_p);
if (error) {
(void)soclose(rso);
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_writesock = wso;
error = unp_connect2(wso, rso);
if (error) {
(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) {
fip->fi_readers++;
if (fip->fi_readers == 1) {
fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
if (fip->fi_writers > 0)
wakeup((caddr_t)&fip->fi_writers);
}
}
if (ap->a_mode & FWRITE) {
fip->fi_writers++;
if (fip->fi_writers == 1) {
fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
if (fip->fi_readers > 0)
wakeup((caddr_t)&fip->fi_readers);
}
}
if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
while (fip->fi_writers == 0) {
VOP_UNLOCK(vp, 0, p);
error = tsleep((caddr_t)&fip->fi_readers,
PCATCH | PSOCK, openstr, 0);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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, 0, p);
error = tsleep((caddr_t)&fip->fi_writers,
PCATCH | PSOCK, openstr, 0);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (error)
goto bad;
}
}
}
return (0);
bad:
VOP_CLOSE(vp, ap->a_mode, ap->a_cred, p);
return (error);
}
/*
* Vnode op for read
*/
/* ARGSUSED */
int
fifo_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
struct uio *uio = ap->a_uio;
struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
struct proc *p = uio->uio_procp;
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, 0, p);
error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
(struct mbuf **)0, (int *)0);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
/*
* 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 */
int
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;
struct proc *p = ap->a_uio->uio_procp;
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, 0, p);
error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
(struct mbuf *)0, 0, p);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
if (ap->a_ioflag & IO_NDELAY)
wso->so_state &= ~SS_NBIO;
return (error);
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
int
fifo_ioctl(ap)
struct vop_ioctl_args /* {
struct vnode *a_vp;
int 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 */
int
fifo_poll(ap)
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct file filetmp;
int revents = 0;
if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
if (filetmp.f_data)
revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
ap->a_p);
}
if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
if (filetmp.f_data)
revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
ap->a_p);
}
return (revents);
}
int
fifo_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap;
{
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
return (0);
}
/*
* This is a noop, simply returning what one has been given.
*/
int
fifo_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */ *ap;
{
if (ap->a_vpp != NULL)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp != NULL)
*ap->a_runp = 0;
if (ap->a_runb != NULL)
*ap->a_runb = 0;
return (0);
}
/*
* Device close routine
*/
/* ARGSUSED */
int
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) {
fip->fi_readers--;
if (fip->fi_readers == 0)
socantsendmore(fip->fi_writesock);
}
if (ap->a_fflag & FWRITE) {
fip->fi_writers--;
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 internal contents of a fifo vnode.
*/
int
fifo_printinfo(vp)
struct vnode *vp;
{
register struct fifoinfo *fip = vp->v_fifoinfo;
printf(", fifo with %ld readers and %ld writers",
fip->fi_readers, fip->fi_writers);
return (0);
}
/*
* Print out the contents of a fifo vnode.
*/
static int
fifo_print(ap)
struct vop_print_args /* {
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 failed operation
*/
static int
fifo_ebadf()
{
return (EBADF);
}
/*
* Fifo advisory byte-level locks.
*/
/* ARGSUSED */
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
*/
int
fifo_badop()
{
panic("fifo_badop called");
/* NOTREACHED */
}
