1 /* $OpenBSD: t_select.c,v 1.2 2020/11/09 23:18:51 bluhm Exp $ */
2 /* $NetBSD: t_select.c,v 1.4 2017/01/13 21:18:33 christos Exp $ */
3
4 /*-
5 * Copyright (c) 2011 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundatiom
9 * by Christos Zoulas.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include "macros.h"
34
35 #include <assert.h>
36 #include <sys/types.h>
37 #include <sys/select.h>
38 #include <sys/wait.h>
39 #include <err.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <errno.h>
46 #include <fcntl.h>
47
48 #include "atf-c.h"
49
50 static sig_atomic_t keep_going = 1;
51
52 static void
sig_handler(int signum __unused)53 sig_handler(int signum __unused)
54 {
55 keep_going = 0;
56 }
57
58 static void
sigchld(int signum __unused)59 sigchld(int signum __unused)
60 {
61 }
62
63 static char
xtoa(uint8_t n)64 xtoa(uint8_t n)
65 {
66 static const char xarray[] = "0123456789abcdef";
67 assert(n < sizeof(xarray));
68 return xarray[n];
69 }
70
71 static const char *
prmask(const sigset_t * m,char * buf,size_t len)72 prmask(const sigset_t *m, char *buf, size_t len)
73 {
74 size_t j = 2;
75 assert(len >= 3 + sizeof(*m));
76 buf[0] = '0';
77 buf[1] = 'x';
78 #define N(p, a) (((p) >> ((a) * 4)) & 0xf)
79 #ifdef __OpenBSD__
80 /* On NetBSD sigset_t is a struct */
81 uint32_t p = (*m);
82 for (size_t k = sizeof(p); k > 0; k--)
83 buf[j++] = xtoa(N(p, k - 1));
84 #else
85 for (size_t i = __arraycount(m->__bits); i > 0; i--) {
86 uint32_t p = m->__bits[i - 1];
87 for (size_t k = sizeof(p); k > 0; k--)
88 buf[j++] = xtoa(N(p, k - 1));
89 }
90 #endif
91 buf[j] = '\0';
92 return buf;
93 }
94
95 static __dead void
child(const struct timespec * ts)96 child(const struct timespec *ts)
97 {
98 struct sigaction sa;
99 sigset_t set, oset, nset;
100 char obuf[sizeof(oset) + 3], nbuf[sizeof(nset) + 3];
101 int fd;
102
103 memset(&sa, 0, sizeof(sa));
104 sa.sa_handler = sig_handler;
105 if ((fd = open("/dev/null", O_RDONLY)) == -1)
106 err(1, "open");
107
108 if (sigaction(SIGTERM, &sa, NULL) == -1)
109 err(1, "sigaction");
110
111 sigfillset(&set);
112 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
113 err(1, "sigprocmask");
114
115 if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
116 err(1, "sigprocmask");
117
118 sigemptyset(&set);
119
120 for (;;) {
121 fd_set rset;
122 FD_ZERO(&rset);
123 FD_SET(fd, &rset);
124 if (pselect(1, &rset, NULL, NULL, ts, &set) == -1) {
125 if(errno == EINTR) {
126 if (!keep_going)
127 break;
128 }
129 }
130 if (ts)
131 break;
132 }
133 if (sigprocmask(SIG_BLOCK, NULL, &nset) == -1)
134 err(1, "sigprocmask");
135 if (memcmp(&oset, &nset, sizeof(oset)) != 0)
136 atf_tc_fail("pselect() masks don't match "
137 "after timeout %s != %s",
138 prmask(&nset, nbuf, sizeof(nbuf)),
139 prmask(&oset, obuf, sizeof(obuf)));
140 _exit(0);
141 }
142
143 ATF_TC(pselect_sigmask);
ATF_TC_HEAD(pselect_sigmask,tc)144 ATF_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
ATF_TC_BODY(pselect_sigmask,tc)150 ATF_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 /*NOTREACHED*/
161 case -1:
162 err(1, "fork");
163 default:
164 sleep(1);
165 if (kill(pid, SIGTERM) == -1)
166 err(1, "kill");
167 sleep(1);
168 switch (waitpid(pid, &status, WNOHANG)) {
169 case -1:
170 err(1, "wait");
171 case 0:
172 if (kill(pid, SIGKILL) == -1)
173 err(1, "kill");
174 atf_tc_fail("pselect() did not receive signal");
175 break;
176 default:
177 break;
178 }
179 }
180 }
181
182 ATF_TC(pselect_timeout);
ATF_TC_HEAD(pselect_timeout,tc)183 ATF_TC_HEAD(pselect_timeout, tc)
184 {
185
186 atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
187 "setting when a timeout occurs");
188 }
189
ATF_TC_BODY(pselect_timeout,tc)190 ATF_TC_BODY(pselect_timeout, tc)
191 {
192 pid_t pid;
193 int status;
194 static const struct timespec zero = { 0, 0 };
195
196 signal(SIGCHLD, sigchld);
197
198 switch (pid = fork()) {
199 case 0:
200 child(&zero);
201 break;
202 case -1:
203 err(1, "fork");
204 default:
205 sleep(1);
206 switch (waitpid(pid, &status, WNOHANG)) {
207 case -1:
208 err(1, "wait");
209 case 0:
210 if (kill(pid, SIGKILL) == -1)
211 err(1, "kill");
212 atf_tc_fail("pselect() did not receive signal");
213 break;
214 default:
215 break;
216 }
217 }
218 }
219
ATF_TP_ADD_TCS(tp)220 ATF_TP_ADD_TCS(tp)
221 {
222
223 ATF_TP_ADD_TC(tp, pselect_sigmask);
224 ATF_TP_ADD_TC(tp, pselect_timeout);
225
226 return atf_no_error();
227 }
228