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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1997 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This function waits for timo clock ticks for something to arrive on
* the specified stream. If more than one client is hanging off of a
* single endpoint, and at least one has specified a non-zero timeout,
* then all will be woken.
*
* Returns:
* 0 on success or positive error code. On
* success, "events" is set to
* 0 on timeout or no events(timout = 0),
* 1 if desired event has occurred
*
* Most of the code is from strwaitq().
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/stream.h>
#include <sys/ioctl.h>
#include <sys/stropts.h>
#include <sys/strsubr.h>
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <sys/tiuser.h>
#include <sys/t_kuser.h>
#include <sys/signal.h>
#include <sys/siginfo.h>
#include <sys/time.h>
#include <sys/debug.h>
/*
* Poll for an input event.
*
* timo is measured in ticks
*/
int
t_kspoll(TIUSER *tiptr, int timo, int waitflg, int *events)
{
file_t *fp;
vnode_t *vp;
klwp_t *lwp = ttolwp(curthread);
clock_t timout; /* milliseconds */
int error;
u_char pri;
int pflag;
rval_t rval;
fp = tiptr->fp;
vp = fp->f_vnode;
if (events == NULL || ((waitflg & READWAIT) == 0))
return (EINVAL);
/* Convert from ticks to milliseconds */
if (timo < 0)
timout = -1;
else
timout = TICK_TO_MSEC(timo);
/*
* Indicate that the lwp is not to be stopped while doing
* this network traffic. This is to avoid deadlock while
* debugging a process via /proc.
*/
if (lwp != NULL)
lwp->lwp_nostop++;
if (waitflg & NOINTR)
pflag = MSG_ANY | MSG_HOLDSIG;
else
pflag = MSG_ANY;
pri = 0;
error = kstrgetmsg(vp, NULL, NULL, &pri, &pflag, timout, &rval);
if (lwp != NULL)
lwp->lwp_nostop--;
/* Set the return *events. */
if (error != 0) {
if (error == ETIME) {
*events = 0;
error = 0;
}
return (error);
}
*events = 1;
return (0);
}
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