t_select.c revision 272343 
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
50sig_handler(int signum)
51{
52	keep_going = 0;
53}
54
55static void
56sigchld(int signum)
57{
58}
59
60static char
61xtoa(uint8_t n)
62{
63	static const char xarray[] = "0123456789abcdef";
64	assert(n < sizeof(xarray));
65	return xarray[n];
66}
67
68static const char *
69prmask(const sigset_t *m, char *buf, size_t len)
70{
71	size_t j = 2;
72	assert(len >= 3 + sizeof(*m));
73	buf[0] = '0';
74	buf[1] = 'x';
75#define N(p, a)	(((p) >> ((a) * 4)) & 0xf)
76	for (size_t i = __arraycount(m->__bits); i > 0; i--) {
77		uint32_t p = m->__bits[i - 1];
78		for (size_t k = sizeof(p); k > 0; k--)
79			buf[j++] = xtoa(N(p, k - 1));
80	}
81	buf[j] = '\0';
82	return buf;
83}
84
85static void
86child(const struct timespec *ts)
87{
88	struct sigaction sa;
89	sigset_t set, oset, nset;
90	char obuf[sizeof(oset) + 3], nbuf[sizeof(nset) + 3];
91	int fd;
92
93	memset(&sa, 0, sizeof(sa));
94	sa.sa_handler = sig_handler;
95	if ((fd = open("/dev/null", O_RDONLY)) == -1)
96		err(1, "open");
97
98	if (sigaction(SIGTERM, &sa, NULL) == -1)
99		err(1, "sigaction");
100
101	sigfillset(&set);
102	if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
103		err(1, "sigprocmask");
104
105	if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
106		err(1, "sigprocmask");
107
108	sigemptyset(&set);
109
110	for (;;) {
111		fd_set rset;
112		FD_ZERO(&rset);
113		FD_SET(fd, &rset);
114		if (pselect(1, &rset, NULL, NULL, ts, &set) == -1) {
115			if(errno == EINTR) {
116				if (!keep_going)
117					break;
118			}
119		}
120		if (ts)
121			break;
122	}
123	if (sigprocmask(SIG_BLOCK, NULL, &nset) == -1)
124		err(1, "sigprocmask");
125	if (memcmp(&oset, &nset, sizeof(oset)) != 0)
126		atf_tc_fail("pselect() masks don't match "
127		    "after timeout %s != %s",
128		    prmask(&nset, nbuf, sizeof(nbuf)),
129		    prmask(&oset, obuf, sizeof(obuf)));
130}
131
132ATF_TC(pselect_sigmask);
133ATF_TC_HEAD(pselect_sigmask, tc)
134{
135	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
136	    "setting when a signal is received (PR lib/43625)");
137}
138
139ATF_TC_BODY(pselect_sigmask, tc)
140{
141	pid_t pid;
142	int status;
143
144	signal(SIGCHLD, sigchld);
145
146	switch (pid = fork()) {
147	case 0:
148		child(NULL);
149	case -1:
150		err(1, "fork");
151	default:
152		sleep(1);
153		if (kill(pid, SIGTERM) == -1)
154			err(1, "kill");
155		sleep(1);
156		switch (waitpid(pid, &status, WNOHANG)) {
157		case -1:
158			err(1, "wait");
159		case 0:
160			if (kill(pid, SIGKILL) == -1)
161				err(1, "kill");
162			atf_tc_fail("pselect() did not receive signal");
163			break;
164		default:
165			break;
166		}
167	}
168}
169
170ATF_TC(pselect_timeout);
171ATF_TC_HEAD(pselect_timeout, tc)
172{
173
174	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
175	    "setting when a timeout occurs");
176}
177
178ATF_TC_BODY(pselect_timeout, tc)
179{
180	pid_t pid;
181	int status;
182	static const struct timespec zero = { 0, 0 };
183
184	signal(SIGCHLD, sigchld);
185
186	switch (pid = fork()) {
187	case 0:
188		child(&zero);
189		break;
190	case -1:
191		err(1, "fork");
192	default:
193		sleep(1);
194		switch (waitpid(pid, &status, WNOHANG)) {
195		case -1:
196			err(1, "wait");
197		case 0:
198			if (kill(pid, SIGKILL) == -1)
199				err(1, "kill");
200			atf_tc_fail("pselect() did not receive signal");
201			break;
202		default:
203			break;
204		}
205	}
206}
207
208ATF_TP_ADD_TCS(tp)
209{
210
211	ATF_TP_ADD_TC(tp, pselect_sigmask);
212	ATF_TP_ADD_TC(tp, pselect_timeout);
213
214	return atf_no_error();
215}
216