t_select.c revision 312040 
1/*	$NetBSD: t_select.c,v 1.3 2012/03/18 07:00:52 jruoho Exp $ */
2
3/*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundatiom
8 * by Christos Zoulas.
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 <assert.h>
33#include <sys/types.h>
34#include <sys/select.h>
35#include <sys/wait.h>
36#include <err.h>
37#include <stdio.h>
38#include <string.h>
39#include <signal.h>
40#include <stdlib.h>
41#include <unistd.h>
42#include <errno.h>
43#include <fcntl.h>
44
45#include <atf-c.h>
46
47static sig_atomic_t keep_going = 1;
48
49static void
50#ifdef __FreeBSD__
51sig_handler(int signum __unused)
52#else
53sig_handler(int signum)
54#endif
55{
56	keep_going = 0;
57}
58
59static void
60#ifdef __FreeBSD__
61sigchld(int signum __unused)
62#else
63sigchld(int signum)
64#endif
65{
66}
67
68static char
69xtoa(uint8_t n)
70{
71	static const char xarray[] = "0123456789abcdef";
72	assert(n < sizeof(xarray));
73	return xarray[n];
74}
75
76static const char *
77prmask(const sigset_t *m, char *buf, size_t len)
78{
79	size_t j = 2;
80	assert(len >= 3 + sizeof(*m));
81	buf[0] = '0';
82	buf[1] = 'x';
83#define N(p, a)	(((p) >> ((a) * 4)) & 0xf)
84	for (size_t i = __arraycount(m->__bits); i > 0; i--) {
85		uint32_t p = m->__bits[i - 1];
86		for (size_t k = sizeof(p); k > 0; k--)
87			buf[j++] = xtoa(N(p, k - 1));
88	}
89	buf[j] = '\0';
90	return buf;
91}
92
93static void
94child(const struct timespec *ts)
95{
96	struct sigaction sa;
97	sigset_t set, oset, nset;
98	char obuf[sizeof(oset) + 3], nbuf[sizeof(nset) + 3];
99	int fd;
100
101	memset(&sa, 0, sizeof(sa));
102	sa.sa_handler = sig_handler;
103	if ((fd = open("/dev/null", O_RDONLY)) == -1)
104		err(1, "open");
105
106	if (sigaction(SIGTERM, &sa, NULL) == -1)
107		err(1, "sigaction");
108
109	sigfillset(&set);
110	if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
111		err(1, "sigprocmask");
112
113	if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
114		err(1, "sigprocmask");
115
116	sigemptyset(&set);
117
118	for (;;) {
119		fd_set rset;
120		FD_ZERO(&rset);
121		FD_SET(fd, &rset);
122		if (pselect(1, &rset, NULL, NULL, ts, &set) == -1) {
123			if(errno == EINTR) {
124				if (!keep_going)
125					break;
126			}
127		}
128		if (ts)
129			break;
130	}
131	if (sigprocmask(SIG_BLOCK, NULL, &nset) == -1)
132		err(1, "sigprocmask");
133	if (memcmp(&oset, &nset, sizeof(oset)) != 0)
134		atf_tc_fail("pselect() masks don't match "
135		    "after timeout %s != %s",
136		    prmask(&nset, nbuf, sizeof(nbuf)),
137		    prmask(&oset, obuf, sizeof(obuf)));
138#ifdef	__FreeBSD__
139	_exit(0);
140#endif
141}
142
143ATF_TC(pselect_sigmask);
144ATF_TC_HEAD(pselect_sigmask, tc)
145{
146	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
147	    "setting when a signal is received (PR lib/43625)");
148}
149
150ATF_TC_BODY(pselect_sigmask, tc)
151{
152	pid_t pid;
153	int status;
154
155	signal(SIGCHLD, sigchld);
156
157	switch (pid = fork()) {
158	case 0:
159		child(NULL);
160#ifdef	__FreeBSD__
161		break;
162#endif
163	case -1:
164		err(1, "fork");
165	default:
166		sleep(1);
167		if (kill(pid, SIGTERM) == -1)
168			err(1, "kill");
169		sleep(1);
170		switch (waitpid(pid, &status, WNOHANG)) {
171		case -1:
172			err(1, "wait");
173		case 0:
174			if (kill(pid, SIGKILL) == -1)
175				err(1, "kill");
176			atf_tc_fail("pselect() did not receive signal");
177			break;
178		default:
179			break;
180		}
181	}
182}
183
184ATF_TC(pselect_timeout);
185ATF_TC_HEAD(pselect_timeout, tc)
186{
187
188	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
189	    "setting when a timeout occurs");
190}
191
192ATF_TC_BODY(pselect_timeout, tc)
193{
194	pid_t pid;
195	int status;
196	static const struct timespec zero = { 0, 0 };
197
198	signal(SIGCHLD, sigchld);
199
200	switch (pid = fork()) {
201	case 0:
202		child(&zero);
203		break;
204	case -1:
205		err(1, "fork");
206	default:
207		sleep(1);
208		switch (waitpid(pid, &status, WNOHANG)) {
209		case -1:
210			err(1, "wait");
211		case 0:
212			if (kill(pid, SIGKILL) == -1)
213				err(1, "kill");
214			atf_tc_fail("pselect() did not receive signal");
215			break;
216		default:
217			break;
218		}
219	}
220}
221
222ATF_TP_ADD_TCS(tp)
223{
224
225	ATF_TP_ADD_TC(tp, pselect_sigmask);
226	ATF_TP_ADD_TC(tp, pselect_timeout);
227
228	return atf_no_error();
229}
230