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