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);
ATF_TC_HEAD(getfilerace,tc)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 *
wrkwrk(void * arg)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
ATF_TC_BODY(getfilerace,tc)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
ATF_TP_ADD_TCS(tp)103 ATF_TP_ADD_TCS(tp)
104 {
105 ATF_TP_ADD_TC(tp, getfilerace);
106
107 return atf_no_error();
108 }
109