1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 1997 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*0Sstevel@tonic-gate /* All Rights Reserved */
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate /*
31*0Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988
32*0Sstevel@tonic-gate * The Regents of the University of California
33*0Sstevel@tonic-gate * All Rights Reserved
34*0Sstevel@tonic-gate *
35*0Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from
36*0Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its
37*0Sstevel@tonic-gate * contributors.
38*0Sstevel@tonic-gate */
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
41*0Sstevel@tonic-gate
42*0Sstevel@tonic-gate /*
43*0Sstevel@tonic-gate * This function waits for timo clock ticks for something to arrive on
44*0Sstevel@tonic-gate * the specified stream. If more than one client is hanging off of a
45*0Sstevel@tonic-gate * single endpoint, and at least one has specified a non-zero timeout,
46*0Sstevel@tonic-gate * then all will be woken.
47*0Sstevel@tonic-gate *
48*0Sstevel@tonic-gate * Returns:
49*0Sstevel@tonic-gate * 0 on success or positive error code. On
50*0Sstevel@tonic-gate * success, "events" is set to
51*0Sstevel@tonic-gate * 0 on timeout or no events(timout = 0),
52*0Sstevel@tonic-gate * 1 if desired event has occurred
53*0Sstevel@tonic-gate *
54*0Sstevel@tonic-gate * Most of the code is from strwaitq().
55*0Sstevel@tonic-gate */
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate #include <sys/param.h>
58*0Sstevel@tonic-gate #include <sys/types.h>
59*0Sstevel@tonic-gate #include <sys/proc.h>
60*0Sstevel@tonic-gate #include <sys/file.h>
61*0Sstevel@tonic-gate #include <sys/user.h>
62*0Sstevel@tonic-gate #include <sys/vnode.h>
63*0Sstevel@tonic-gate #include <sys/errno.h>
64*0Sstevel@tonic-gate #include <sys/stream.h>
65*0Sstevel@tonic-gate #include <sys/ioctl.h>
66*0Sstevel@tonic-gate #include <sys/stropts.h>
67*0Sstevel@tonic-gate #include <sys/strsubr.h>
68*0Sstevel@tonic-gate #include <sys/tihdr.h>
69*0Sstevel@tonic-gate #include <sys/timod.h>
70*0Sstevel@tonic-gate #include <sys/tiuser.h>
71*0Sstevel@tonic-gate #include <sys/t_kuser.h>
72*0Sstevel@tonic-gate #include <sys/signal.h>
73*0Sstevel@tonic-gate #include <sys/siginfo.h>
74*0Sstevel@tonic-gate #include <sys/time.h>
75*0Sstevel@tonic-gate #include <sys/debug.h>
76*0Sstevel@tonic-gate
77*0Sstevel@tonic-gate /*
78*0Sstevel@tonic-gate * Poll for an input event.
79*0Sstevel@tonic-gate *
80*0Sstevel@tonic-gate * timo is measured in ticks
81*0Sstevel@tonic-gate */
82*0Sstevel@tonic-gate int
t_kspoll(TIUSER * tiptr,int timo,int waitflg,int * events)83*0Sstevel@tonic-gate t_kspoll(TIUSER *tiptr, int timo, int waitflg, int *events)
84*0Sstevel@tonic-gate {
85*0Sstevel@tonic-gate file_t *fp;
86*0Sstevel@tonic-gate vnode_t *vp;
87*0Sstevel@tonic-gate klwp_t *lwp = ttolwp(curthread);
88*0Sstevel@tonic-gate clock_t timout; /* milliseconds */
89*0Sstevel@tonic-gate int error;
90*0Sstevel@tonic-gate u_char pri;
91*0Sstevel@tonic-gate int pflag;
92*0Sstevel@tonic-gate rval_t rval;
93*0Sstevel@tonic-gate
94*0Sstevel@tonic-gate fp = tiptr->fp;
95*0Sstevel@tonic-gate vp = fp->f_vnode;
96*0Sstevel@tonic-gate
97*0Sstevel@tonic-gate if (events == NULL || ((waitflg & READWAIT) == 0))
98*0Sstevel@tonic-gate return (EINVAL);
99*0Sstevel@tonic-gate
100*0Sstevel@tonic-gate /* Convert from ticks to milliseconds */
101*0Sstevel@tonic-gate if (timo < 0)
102*0Sstevel@tonic-gate timout = -1;
103*0Sstevel@tonic-gate else
104*0Sstevel@tonic-gate timout = TICK_TO_MSEC(timo);
105*0Sstevel@tonic-gate
106*0Sstevel@tonic-gate /*
107*0Sstevel@tonic-gate * Indicate that the lwp is not to be stopped while doing
108*0Sstevel@tonic-gate * this network traffic. This is to avoid deadlock while
109*0Sstevel@tonic-gate * debugging a process via /proc.
110*0Sstevel@tonic-gate */
111*0Sstevel@tonic-gate if (lwp != NULL)
112*0Sstevel@tonic-gate lwp->lwp_nostop++;
113*0Sstevel@tonic-gate
114*0Sstevel@tonic-gate if (waitflg & NOINTR)
115*0Sstevel@tonic-gate pflag = MSG_ANY | MSG_HOLDSIG;
116*0Sstevel@tonic-gate else
117*0Sstevel@tonic-gate pflag = MSG_ANY;
118*0Sstevel@tonic-gate pri = 0;
119*0Sstevel@tonic-gate error = kstrgetmsg(vp, NULL, NULL, &pri, &pflag, timout, &rval);
120*0Sstevel@tonic-gate
121*0Sstevel@tonic-gate if (lwp != NULL)
122*0Sstevel@tonic-gate lwp->lwp_nostop--;
123*0Sstevel@tonic-gate
124*0Sstevel@tonic-gate /* Set the return *events. */
125*0Sstevel@tonic-gate if (error != 0) {
126*0Sstevel@tonic-gate if (error == ETIME) {
127*0Sstevel@tonic-gate *events = 0;
128*0Sstevel@tonic-gate error = 0;
129*0Sstevel@tonic-gate }
130*0Sstevel@tonic-gate return (error);
131*0Sstevel@tonic-gate }
132*0Sstevel@tonic-gate *events = 1;
133*0Sstevel@tonic-gate return (0);
134*0Sstevel@tonic-gate }
135