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 /* 41 * This function waits for timo clock ticks for something to arrive on 42 * the specified stream. If more than one client is hanging off of a 43 * single endpoint, and at least one has specified a non-zero timeout, 44 * then all will be woken. 45 * 46 * Returns: 47 * 0 on success or positive error code. On 48 * success, "events" is set to 49 * 0 on timeout or no events(timout = 0), 50 * 1 if desired event has occurred 51 * 52 * Most of the code is from strwaitq(). 53 */ 54 55 #include <sys/param.h> 56 #include <sys/types.h> 57 #include <sys/proc.h> 58 #include <sys/file.h> 59 #include <sys/user.h> 60 #include <sys/vnode.h> 61 #include <sys/errno.h> 62 #include <sys/stream.h> 63 #include <sys/ioctl.h> 64 #include <sys/stropts.h> 65 #include <sys/strsubr.h> 66 #include <sys/tihdr.h> 67 #include <sys/timod.h> 68 #include <sys/tiuser.h> 69 #include <sys/t_kuser.h> 70 #include <sys/signal.h> 71 #include <sys/siginfo.h> 72 #include <sys/time.h> 73 #include <sys/debug.h> 74 75 /* 76 * Poll for an input event. 77 * 78 * timo is measured in ticks 79 */ 80 int 81 t_kspoll(TIUSER *tiptr, int timo, int waitflg, int *events) 82 { 83 file_t *fp; 84 vnode_t *vp; 85 klwp_t *lwp = ttolwp(curthread); 86 clock_t timout; /* milliseconds */ 87 int error; 88 u_char pri; 89 int pflag; 90 rval_t rval; 91 92 fp = tiptr->fp; 93 vp = fp->f_vnode; 94 95 if (events == NULL || ((waitflg & READWAIT) == 0)) 96 return (EINVAL); 97 98 /* Convert from ticks to milliseconds */ 99 if (timo < 0) 100 timout = -1; 101 else 102 timout = TICK_TO_MSEC(timo); 103 104 /* 105 * Indicate that the lwp is not to be stopped while doing 106 * this network traffic. This is to avoid deadlock while 107 * debugging a process via /proc. 108 */ 109 if (lwp != NULL) 110 lwp->lwp_nostop++; 111 112 if (waitflg & NOINTR) 113 pflag = MSG_ANY | MSG_HOLDSIG; 114 else 115 pflag = MSG_ANY; 116 pri = 0; 117 error = kstrgetmsg(vp, NULL, NULL, &pri, &pflag, timout, &rval); 118 119 if (lwp != NULL) 120 lwp->lwp_nostop--; 121 122 /* Set the return *events. */ 123 if (error != 0) { 124 if (error == ETIME) { 125 *events = 0; 126 error = 0; 127 } 128 return (error); 129 } 130 *events = 1; 131 return (0); 132 } 133