cf874b345d
Approved by: trb
622 lines
15 KiB
C
622 lines
15 KiB
C
/*
|
|
* 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/event.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/proc.h> /* XXXKSE */
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/un.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/vnode.h>
|
|
#include <fs/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_print(struct vop_print_args *);
|
|
static int fifo_lookup(struct vop_lookup_args *);
|
|
static int fifo_open(struct vop_open_args *);
|
|
static int fifo_close(struct vop_close_args *);
|
|
static int fifo_read(struct vop_read_args *);
|
|
static int fifo_write(struct vop_write_args *);
|
|
static int fifo_ioctl(struct vop_ioctl_args *);
|
|
static int fifo_poll(struct vop_poll_args *);
|
|
static int fifo_kqfilter(struct vop_kqfilter_args *);
|
|
static int fifo_pathconf(struct vop_pathconf_args *);
|
|
static int fifo_advlock(struct vop_advlock_args *);
|
|
|
|
static void filt_fifordetach(struct knote *kn);
|
|
static int filt_fiforead(struct knote *kn, long hint);
|
|
static void filt_fifowdetach(struct knote *kn);
|
|
static int filt_fifowrite(struct knote *kn, long hint);
|
|
|
|
static struct filterops fiforead_filtops =
|
|
{ 1, NULL, filt_fifordetach, filt_fiforead };
|
|
static struct filterops fifowrite_filtops =
|
|
{ 1, NULL, filt_fifowdetach, filt_fifowrite };
|
|
|
|
vop_t **fifo_vnodeop_p;
|
|
static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_defaultop },
|
|
{ &vop_access_desc, (vop_t *) vop_ebadf },
|
|
{ &vop_advlock_desc, (vop_t *) fifo_advlock },
|
|
{ &vop_close_desc, (vop_t *) fifo_close },
|
|
{ &vop_create_desc, (vop_t *) vop_panic },
|
|
{ &vop_getattr_desc, (vop_t *) vop_ebadf },
|
|
{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
|
|
{ &vop_ioctl_desc, (vop_t *) fifo_ioctl },
|
|
{ &vop_kqfilter_desc, (vop_t *) fifo_kqfilter },
|
|
{ &vop_lease_desc, (vop_t *) vop_null },
|
|
{ &vop_link_desc, (vop_t *) vop_panic },
|
|
{ &vop_lookup_desc, (vop_t *) fifo_lookup },
|
|
{ &vop_mkdir_desc, (vop_t *) vop_panic },
|
|
{ &vop_mknod_desc, (vop_t *) vop_panic },
|
|
{ &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 *) vop_panic },
|
|
{ &vop_readlink_desc, (vop_t *) vop_panic },
|
|
{ &vop_reallocblks_desc, (vop_t *) vop_panic },
|
|
{ &vop_reclaim_desc, (vop_t *) vop_null },
|
|
{ &vop_remove_desc, (vop_t *) vop_panic },
|
|
{ &vop_rename_desc, (vop_t *) vop_panic },
|
|
{ &vop_rmdir_desc, (vop_t *) vop_panic },
|
|
{ &vop_setattr_desc, (vop_t *) vop_ebadf },
|
|
{ &vop_symlink_desc, (vop_t *) vop_panic },
|
|
{ &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);
|
|
|
|
int
|
|
fifo_vnoperate(ap)
|
|
struct vop_generic_args /* {
|
|
struct vnodeop_desc *a_desc;
|
|
<other random data follows, presumably>
|
|
} */ *ap;
|
|
{
|
|
return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
|
|
}
|
|
|
|
/*
|
|
* Trivial lookup routine that always fails.
|
|
*/
|
|
/* ARGSUSED */
|
|
static 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 */
|
|
static int
|
|
fifo_open(ap)
|
|
struct vop_open_args /* {
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct fifoinfo *fip;
|
|
struct thread *td = ap->a_td;
|
|
struct socket *rso, *wso;
|
|
int error;
|
|
|
|
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_td->td_ucred, ap->a_td);
|
|
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_td->td_ucred, ap->a_td);
|
|
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_snd.sb_lowat = PIPE_BUF;
|
|
rso->so_state |= SS_CANTRCVMORE;
|
|
}
|
|
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);
|
|
sowwakeup(fip->fi_writesock);
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
sorwakeup(fip->fi_writesock);
|
|
}
|
|
}
|
|
}
|
|
if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
|
|
while (fip->fi_writers == 0) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
error = tsleep((caddr_t)&fip->fi_readers,
|
|
PCATCH | PSOCK, "fifoor", 0);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
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, td);
|
|
/*
|
|
* XXX: Some race I havn't located is solved
|
|
* by timing out after a sec. Race seen when
|
|
* sendmail hangs here during boot /phk
|
|
*/
|
|
error = tsleep((caddr_t)&fip->fi_writers,
|
|
PCATCH | PSOCK, "fifoow", hz);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
bad:
|
|
VOP_CLOSE(vp, ap->a_mode, ap->a_cred, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for read
|
|
*/
|
|
/* ARGSUSED */
|
|
static 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 thread *td = uio->uio_td;
|
|
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, td);
|
|
error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
|
|
(struct mbuf **)0, (int *)0);
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
rso->so_state &= ~SS_NBIO;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write
|
|
*/
|
|
/* ARGSUSED */
|
|
static 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 thread *td = ap->a_uio->uio_td;
|
|
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, td);
|
|
error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
|
|
(struct mbuf *)0, 0, td);
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
if (ap->a_ioflag & IO_NDELAY)
|
|
wso->so_state &= ~SS_NBIO;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
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 thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct file filetmp; /* Local, so need not be locked. */
|
|
int error;
|
|
|
|
if (ap->a_command == FIONBIO)
|
|
return (0);
|
|
if (ap->a_fflag & FREAD) {
|
|
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
|
|
filetmp.f_cred = ap->a_cred;
|
|
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
|
|
ap->a_td->td_ucred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
if (ap->a_fflag & FWRITE) {
|
|
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
|
|
filetmp.f_cred = ap->a_cred;
|
|
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
|
|
ap->a_td->td_ucred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
fifo_kqfilter(ap)
|
|
struct vop_kqfilter_args /* {
|
|
struct vnode *a_vp;
|
|
struct knote *a_kn;
|
|
} */ *ap;
|
|
{
|
|
struct fifoinfo *fi = ap->a_vp->v_fifoinfo;
|
|
struct socket *so;
|
|
struct sockbuf *sb;
|
|
|
|
switch (ap->a_kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
ap->a_kn->kn_fop = &fiforead_filtops;
|
|
so = fi->fi_readsock;
|
|
sb = &so->so_rcv;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
ap->a_kn->kn_fop = &fifowrite_filtops;
|
|
so = fi->fi_writesock;
|
|
sb = &so->so_snd;
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
ap->a_kn->kn_hook = (caddr_t)so;
|
|
|
|
SLIST_INSERT_HEAD(&sb->sb_sel.si_note, ap->a_kn, kn_selnext);
|
|
sb->sb_flags |= SB_KNOTE;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
filt_fifordetach(struct knote *kn)
|
|
{
|
|
struct socket *so = (struct socket *)kn->kn_hook;
|
|
|
|
SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
|
|
if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
|
|
so->so_rcv.sb_flags &= ~SB_KNOTE;
|
|
}
|
|
|
|
static int
|
|
filt_fiforead(struct knote *kn, long hint)
|
|
{
|
|
struct socket *so = (struct socket *)kn->kn_hook;
|
|
|
|
kn->kn_data = so->so_rcv.sb_cc;
|
|
if (so->so_state & SS_CANTRCVMORE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
}
|
|
kn->kn_flags &= ~EV_EOF;
|
|
return (kn->kn_data > 0);
|
|
}
|
|
|
|
static void
|
|
filt_fifowdetach(struct knote *kn)
|
|
{
|
|
struct socket *so = (struct socket *)kn->kn_hook;
|
|
|
|
SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
|
|
if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
|
|
so->so_snd.sb_flags &= ~SB_KNOTE;
|
|
}
|
|
|
|
static int
|
|
filt_fifowrite(struct knote *kn, long hint)
|
|
{
|
|
struct socket *so = (struct socket *)kn->kn_hook;
|
|
|
|
kn->kn_data = sbspace(&so->so_snd);
|
|
if (so->so_state & SS_CANTSENDMORE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
}
|
|
kn->kn_flags &= ~EV_EOF;
|
|
return (kn->kn_data >= so->so_snd.sb_lowat);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
fifo_poll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct file filetmp;
|
|
int events, revents = 0;
|
|
|
|
events = ap->a_events &
|
|
(POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
|
|
if (events) {
|
|
/*
|
|
* If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is
|
|
* not, then convert the first two to the last one. This
|
|
* tells the socket poll function to ignore EOF so that we
|
|
* block if there is no writer (and no data). Callers can
|
|
* set POLLINIGNEOF to get non-blocking behavior.
|
|
*/
|
|
if (events & (POLLIN | POLLRDNORM) &&
|
|
!(events & POLLINIGNEOF)) {
|
|
events &= ~(POLLIN | POLLRDNORM);
|
|
events |= POLLINIGNEOF;
|
|
}
|
|
|
|
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
|
|
filetmp.f_cred = ap->a_cred;
|
|
if (filetmp.f_data)
|
|
revents |= soo_poll(&filetmp, events,
|
|
ap->a_td->td_ucred, ap->a_td);
|
|
|
|
/* Reverse the above conversion. */
|
|
if ((revents & POLLINIGNEOF) &&
|
|
!(ap->a_events & POLLINIGNEOF)) {
|
|
revents |= (ap->a_events & (POLLIN | POLLRDNORM));
|
|
revents &= ~POLLINIGNEOF;
|
|
}
|
|
}
|
|
events = ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND);
|
|
if (events) {
|
|
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
|
|
filetmp.f_cred = ap->a_cred;
|
|
if (filetmp.f_data) {
|
|
revents |= soo_poll(&filetmp, events,
|
|
ap->a_td->td_ucred, ap->a_td);
|
|
}
|
|
}
|
|
return (revents);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fifo_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *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 (vrefcnt(vp) > 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;
|
|
{
|
|
fifo_printinfo(ap->a_vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to fifo's.
|
|
*/
|
|
static 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);
|
|
}
|