t_pipe.c revision 314817 
1/* $NetBSD: t_pipe.c,v 1.2 2017/01/13 21:30:41 christos Exp $ */
2
3/*-
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Luke Mewburn and Jaromir Dolecek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__COPYRIGHT("@(#) Copyright (c) 2008\
34 The NetBSD Foundation, inc. All rights reserved.");
35__RCSID("$NetBSD: t_pipe.c,v 1.2 2017/01/13 21:30:41 christos Exp $");
36
37#include <sys/event.h>
38#include <sys/wait.h>
39
40#include <fcntl.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <unistd.h>
44
45#include <atf-c.h>
46
47#include "h_macros.h"
48
49ATF_TC(pipe1);
50ATF_TC_HEAD(pipe1, tc)
51{
52	atf_tc_set_md_var(tc, "descr",
53	    "Checks EVFILT_WRITE for pipes. This test used to trigger "
54	    "problem fixed in rev. 1.5.2.7 of sys/kern/sys_pipe.c");
55}
56ATF_TC_BODY(pipe1, tc)
57{
58	struct kevent event[1];
59	int fds[2];
60	int kq, n;
61
62	RL(pipe(fds));
63	RL(kq = kqueue());
64	RL(close(fds[0]));
65
66	EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
67	ATF_REQUIRE_EQ_MSG((n = kevent(kq, event, 1, NULL, 0, NULL)),
68	    -1, "got: %d", n);
69	ATF_REQUIRE_EQ_MSG(errno, EBADF, "got: %s", strerror(errno));
70}
71
72ATF_TC(pipe2);
73ATF_TC_HEAD(pipe2, tc)
74{
75	atf_tc_set_md_var(tc, "descr",
76	    "Checks EVFILT_WRITE for pipes. This test used to trigger problem "
77	    "fixed in rev. 1.5.2.9 of sys/kern/sys_pipe.c");
78}
79ATF_TC_BODY(pipe2, tc)
80{
81	struct kevent event[1];
82	char buffer[128];
83	int fds[2];
84	int kq, n;
85	int status;
86	pid_t child;
87
88	RL(pipe(fds));
89	RL(kq = kqueue());
90
91	EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
92	RL(kevent(kq, event, 1, NULL, 0, NULL));
93
94	/* spawn child reader */
95	RL(child = fork());
96	if (child == 0) {
97		int sz = read(fds[0], buffer, 128);
98		if (sz > 0)
99			(void)printf("pipe: child read '%.*s'\n", sz, buffer);
100		exit(sz <= 0);
101	}
102
103	RL(n = kevent(kq, NULL, 0, event, 1, NULL));
104
105	(void)printf("kevent num %d flags: %#x, fflags: %#x, data: "
106	    "%" PRId64 "\n", n, event[0].flags, event[0].fflags, event[0].data);
107
108	RL(n = write(fds[1], "foo", 3));
109	RL(close(fds[1]));
110
111	(void)waitpid(child, &status, 0);
112}
113
114ATF_TC(pipe3);
115ATF_TC_HEAD(pipe3, tc)
116{
117	atf_tc_set_md_var(tc, "descr",
118	    "Checks EVFILT_WRITE for pipes. This test used to trigger problem "
119	    "fixed in rev. 1.5.2.10 of sys/kern/sys_pipe.c");
120}
121ATF_TC_BODY(pipe3, tc)
122{
123	struct kevent event[1];
124	int fds[2];
125	int kq;
126
127	RL(pipe(fds));
128	RL(kq = kqueue());
129
130	EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
131	RL(kevent(kq, event, 1, NULL, 0, NULL));
132
133	/* close 'read' end first, then 'write' */
134
135	RL(close(fds[0]));
136	RL(close(fds[1]));
137}
138
139
140ATF_TP_ADD_TCS(tp)
141{
142	ATF_TP_ADD_TC(tp, pipe1);
143	ATF_TP_ADD_TC(tp, pipe2);
144	ATF_TP_ADD_TC(tp, pipe3);
145
146	return atf_no_error();
147}
148