1 /* $NetBSD: t_sigqueue.c,v 1.7 2017/01/13 20:44:10 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 Foundation 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 <sys/cdefs.h> 33 __RCSID("$NetBSD: t_sigqueue.c,v 1.7 2017/01/13 20:44:10 christos Exp $"); 34 35 #include <atf-c.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <sched.h> 42 #include <unistd.h> 43 44 #ifdef __FreeBSD__ 45 #include <err.h> 46 #include <stdio.h> 47 #endif 48 49 static void handler(int, siginfo_t *, void *); 50 51 #define VALUE (int)0xc001dad1 52 static int value; 53 54 static void 55 handler(int signo __unused, siginfo_t *info, void *data __unused) 56 { 57 value = info->si_value.sival_int; 58 kill(0, SIGINFO); 59 } 60 61 ATF_TC(sigqueue_basic); 62 ATF_TC_HEAD(sigqueue_basic, tc) 63 { 64 atf_tc_set_md_var(tc, "descr", "Checks sigqueue(3) sigval delivery"); 65 } 66 67 ATF_TC_BODY(sigqueue_basic, tc) 68 { 69 struct sigaction sa; 70 union sigval sv; 71 72 sa.sa_sigaction = handler; 73 sigemptyset(&sa.sa_mask); 74 sa.sa_flags = SA_SIGINFO; 75 76 if (sigaction(SIGUSR1, &sa, NULL) != 0) 77 atf_tc_fail("sigaction failed"); 78 79 sv.sival_int = VALUE; 80 81 #ifdef __FreeBSD__ 82 /* 83 * From kern_sig.c: 84 * Specification says sigqueue can only send signal to single process. 85 */ 86 if (sigqueue(getpid(), SIGUSR1, sv) != 0) 87 #else 88 if (sigqueue(0, SIGUSR1, sv) != 0) 89 #endif 90 atf_tc_fail("sigqueue failed"); 91 92 sched_yield(); 93 ATF_REQUIRE_EQ(sv.sival_int, value); 94 } 95 96 ATF_TC(sigqueue_err); 97 ATF_TC_HEAD(sigqueue_err, tc) 98 { 99 atf_tc_set_md_var(tc, "descr", "Test errors from sigqueue(3)"); 100 } 101 102 ATF_TC_BODY(sigqueue_err, tc) 103 { 104 static union sigval sv; 105 106 errno = 0; 107 ATF_REQUIRE_ERRNO(EINVAL, sigqueue(getpid(), -1, sv) == -1); 108 } 109 110 static int signals[] = { 111 SIGINT, SIGRTMIN + 1, SIGINT, SIGRTMIN + 0, SIGRTMIN + 2, 112 SIGQUIT, SIGRTMIN + 1 113 }; 114 #ifdef __arraycount 115 #define CNT __arraycount(signals) 116 #else 117 #define CNT (sizeof(signals) / sizeof(signals[0])) 118 #endif 119 120 static sig_atomic_t count = 0; 121 static int delivered[CNT]; 122 123 static void 124 myhandler(int signo, siginfo_t *info, void *context __unused) 125 { 126 delivered[count++] = signo; 127 printf("Signal #%zu: signo: %d\n", (size_t)count, signo); 128 } 129 130 static int 131 asc(const void *a, const void *b) 132 { 133 const int *ia = a, *ib = b; 134 return *ib - *ia; 135 } 136 137 /* 138 * given a array of signals to be delivered in tosend of size len 139 * place in ordered the signals to be delivered in delivery order 140 * and return the number of signals that should be delivered 141 */ 142 static size_t 143 sigorder(int *ordered, const int *tosend, size_t len) 144 { 145 memcpy(ordered, tosend, len * sizeof(*tosend)); 146 qsort(ordered, len, sizeof(*ordered), asc); 147 if (len == 1) 148 return len; 149 150 #ifdef __FreeBSD__ 151 /* 152 * Don't dedupe signal numbers (bug 212173) 153 * 154 * Per kib's comment.. 155 * 156 * " 157 * OTOH, FreeBSD behaviour is to treat all signals as realtime while 158 * there is no mem shortage and siginfo can be allocated. In 159 * particular, signals < SIGRTMIN are not collapsed when queued more 160 * than once. 161 * " 162 */ 163 164 return len; 165 #else 166 167 size_t i, j; 168 for (i = 0, j = 0; i < len - 1; i++) { 169 if (ordered[i] >= SIGRTMIN) 170 continue; 171 if (j == 0) 172 j = i + 1; 173 while (ordered[i] == ordered[j] && j < len) 174 j++; 175 if (j == len) 176 break; 177 ordered[i + 1] = ordered[j]; 178 } 179 return i + 1; 180 #endif 181 } 182 183 ATF_TC(sigqueue_rt); 184 ATF_TC_HEAD(sigqueue_rt, tc) 185 { 186 atf_tc_set_md_var(tc, "descr", "Test queuing of real-time signals"); 187 } 188 189 ATF_TC_BODY(sigqueue_rt, tc) 190 { 191 pid_t pid; 192 union sigval val; 193 struct sigaction act; 194 int ordered[CNT]; 195 struct sigaction oact[CNT]; 196 size_t ndelivered; 197 198 ndelivered = sigorder(ordered, signals, CNT); 199 200 act.sa_flags = SA_SIGINFO; 201 act.sa_sigaction = myhandler; 202 sigemptyset(&act.sa_mask); 203 for (size_t i = 0; i < ndelivered; i++) 204 ATF_REQUIRE(sigaction(ordered[i], &act, &oact[i]) != -1); 205 206 val.sival_int = 0; 207 pid = getpid(); 208 209 sigset_t mask, orig; 210 sigemptyset(&mask); 211 for (size_t i = 0; i < CNT; i++) 212 if (sigaddset(&mask, signals[i]) == -1) 213 warn("sigaddset"); 214 215 216 ATF_REQUIRE(sigprocmask(SIG_BLOCK, &mask, &orig) != -1); 217 218 for (size_t i = 0; i < CNT; i++) 219 ATF_REQUIRE(sigqueue(pid, signals[i], val) != -1); 220 221 ATF_REQUIRE(sigprocmask(SIG_UNBLOCK, &mask, &orig) != -1); 222 sleep(1); 223 ATF_CHECK_MSG((size_t)count == ndelivered, 224 "count %zu != ndelivered %zu", (size_t)count, ndelivered); 225 226 for (size_t i = 0; i < ndelivered; i++) 227 ATF_REQUIRE_MSG(ordered[i] == delivered[i], 228 "%zu: ordered %d != delivered %d", 229 i, ordered[i], delivered[i]); 230 231 if ((size_t)count > ndelivered) 232 for (size_t i = ndelivered; i < (size_t)count; i++) 233 printf("Undelivered signal #%zu: %d\n", i, ordered[i]); 234 235 for (size_t i = 0; i < ndelivered; i++) 236 ATF_REQUIRE(sigaction(signals[i], &oact[i], NULL) != -1); 237 } 238 239 ATF_TP_ADD_TCS(tp) 240 { 241 242 ATF_TP_ADD_TC(tp, sigqueue_basic); 243 ATF_TP_ADD_TC(tp, sigqueue_err); 244 ATF_TP_ADD_TC(tp, sigqueue_rt); 245 246 return atf_no_error(); 247 } 248