1 /* $NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 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_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $"); 31 32 #include <sys/types.h> 33 34 #include <assert.h> 35 #include <atf-c.h> 36 #include <fcntl.h> 37 #include <stdlib.h> 38 #include <pthread.h> 39 40 #include <rump/rump.h> 41 #include <rump/rump_syscalls.h> 42 43 #include "h_macros.h" 44 45 ATF_TC(getfilerace); 46 ATF_TC_HEAD(getfilerace, tc) 47 { 48 49 atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. " 50 "fd_getfile() and fd_close() (PR kern/43694)"); 51 } 52 53 static int fd; 54 static volatile bool quit; 55 56 static void * 57 wrkwrk(void *arg) 58 { 59 60 /* just something to cause fd_getfile() to be called */ 61 while (!quit) 62 rump_sys_write(fd, &fd, sizeof(fd)); 63 64 return NULL; 65 } 66 67 /* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */ 68 #define DEFAULT_ITERATIONS 10000 69 70 ATF_TC_BODY(getfilerace, tc) 71 { 72 pthread_t pt; 73 int fd_wrk; 74 int i, iters; 75 76 /* 77 * Want a multiprocessor virtual kernel. A multiprocessor host 78 * probably helps too, but that's harder to do in software... 79 */ 80 setenv("RUMP_NCPU", "2", 1); 81 rump_init(); 82 83 fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0); 84 if (fd == -1) 85 atf_tc_fail_errno("cannot open /dev/null"); 86 87 if (atf_tc_has_config_var(tc, "iters")) 88 iters = atoi(atf_tc_get_config_var(tc, "iters")); 89 else 90 iters = DEFAULT_ITERATIONS; 91 92 pthread_create(&pt, NULL, wrkwrk, NULL); 93 for (i = 0; i < iters; i++) { 94 rump_sys_close(fd_wrk); 95 fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0); 96 assert(fd == fd_wrk); 97 } 98 99 quit = true; 100 pthread_join(pt, NULL); 101 } 102 103 ATF_TP_ADD_TCS(tp) 104 { 105 ATF_TP_ADD_TC(tp, getfilerace); 106 107 return atf_no_error(); 108 } 109