1/* $NetBSD: t_scan.c,v 1.2 2021/10/10 19:17:31 wiz Exp $ */ 2 3/*- 4 * Copyright (c) 2021 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__RCSID("$NetBSD: t_scan.c,v 1.2 2021/10/10 19:17:31 wiz Exp $"); 31 32#include <sys/event.h> 33#include <sys/time.h> 34#include <sys/types.h> 35 36#include <err.h> 37#include <pthread.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <unistd.h> 41 42#include <atf-c.h> 43 44/* 45 * Each kevent thread will make this many kevent() calls, and if it 46 * achieves this mark, we assume the race condition has not occurred 47 * the declare the test passes. 48 */ 49#define NKEVENT_CALLS 10000 50 51static int kq; 52 53static void * 54kevent_thread(void *arg) 55{ 56 struct timespec ts = { 0, 0 }; 57 struct kevent event; 58 int rv, i; 59 60 for (i = 0; i < NKEVENT_CALLS; i++) { 61 rv = kevent(kq, NULL, 0, &event, 1, &ts); 62 if (rv < 0) { 63 i = rv; 64 break; 65 } 66 if (rv != 1) { 67 break; 68 } 69 } 70 71 return (void *)(intptr_t)i; 72} 73 74ATF_TC(scan1); 75ATF_TC_HEAD(scan1, tc) 76{ 77 atf_tc_set_md_var(tc, "descr", 78 "Exercises multi-threaded kevent() calls (PR kern/50094)"); 79} 80 81ATF_TC_BODY(scan1, tc) 82{ 83 pthread_t t1, t2; 84 void *v1, *v2; 85 intptr_t r1, r2; 86 struct kevent event; 87 int p[2]; 88 89 ATF_REQUIRE(pipe(p) == 0); 90 ATF_REQUIRE((kq = kqueue()) >= 0); 91 92 EV_SET(&event, p[0], EVFILT_READ, EV_ADD, 0, 0, 0); 93 ATF_REQUIRE(kevent(kq, &event, 1, NULL, 0, NULL) == 0); 94 ATF_REQUIRE(write(p[1], p, 1) == 1); 95 96 ATF_REQUIRE(pthread_create(&t1, NULL, kevent_thread, NULL) == 0); 97 ATF_REQUIRE(pthread_create(&t2, NULL, kevent_thread, NULL) == 0); 98 99 ATF_REQUIRE(pthread_join(t1, &v1) == 0); 100 r1 = (intptr_t)v1; 101 102 ATF_REQUIRE(pthread_join(t2, &v2) == 0); 103 r2 = (intptr_t)v2; 104 105 ATF_REQUIRE(r1 >= 0); 106 ATF_REQUIRE(r2 >= 0); 107 108 ATF_REQUIRE(r1 == NKEVENT_CALLS); 109 ATF_REQUIRE(r2 == NKEVENT_CALLS); 110} 111 112ATF_TP_ADD_TCS(tp) 113{ 114 ATF_TP_ADD_TC(tp, scan1); 115 116 return atf_no_error(); 117} 118