1/*	$NetBSD: t_select.c,v 1.4 2017/01/13 21:18:33 christos 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 __unused)
51{
52	keep_going = 0;
53}
54
55static void
56sigchld(int signum __unused)
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 __dead 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	_exit(0);
131}
132
133ATF_TC(pselect_sigmask);
134ATF_TC_HEAD(pselect_sigmask, tc)
135{
136	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
137	    "setting when a signal is received (PR lib/43625)");
138}
139
140ATF_TC_BODY(pselect_sigmask, tc)
141{
142	pid_t pid;
143	int status;
144
145	signal(SIGCHLD, sigchld);
146
147	switch (pid = fork()) {
148	case 0:
149		child(NULL);
150		/*NOTREACHED*/
151	case -1:
152		err(1, "fork");
153	default:
154		sleep(1);
155		if (kill(pid, SIGTERM) == -1)
156			err(1, "kill");
157		sleep(1);
158		switch (waitpid(pid, &status, WNOHANG)) {
159		case -1:
160			err(1, "wait");
161		case 0:
162			if (kill(pid, SIGKILL) == -1)
163				err(1, "kill");
164			atf_tc_fail("pselect() did not receive signal");
165			break;
166		default:
167			break;
168		}
169	}
170}
171
172ATF_TC(pselect_timeout);
173ATF_TC_HEAD(pselect_timeout, tc)
174{
175
176	atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
177	    "setting when a timeout occurs");
178}
179
180ATF_TC_BODY(pselect_timeout, tc)
181{
182	pid_t pid;
183	int status;
184	static const struct timespec zero = { 0, 0 };
185
186	signal(SIGCHLD, sigchld);
187
188	switch (pid = fork()) {
189	case 0:
190		child(&zero);
191		break;
192	case -1:
193		err(1, "fork");
194	default:
195		sleep(1);
196		switch (waitpid(pid, &status, WNOHANG)) {
197		case -1:
198			err(1, "wait");
199		case 0:
200			if (kill(pid, SIGKILL) == -1)
201				err(1, "kill");
202			atf_tc_fail("pselect() did not receive signal");
203			break;
204		default:
205			break;
206		}
207	}
208}
209
210ATF_TP_ADD_TCS(tp)
211{
212
213	ATF_TP_ADD_TC(tp, pselect_sigmask);
214	ATF_TP_ADD_TC(tp, pselect_timeout);
215
216	return atf_no_error();
217}
218