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