1 /* $OpenBSD: t_select.c,v 1.1.1.1 2019/11/19 19:57:04 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 53 sig_handler(int signum __unused) 54 { 55 keep_going = 0; 56 } 57 58 static void 59 sigchld(int signum __unused) 60 { 61 } 62 63 static char 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 * 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 /* Adjusted for OpenBSD, on NetBSD sigset_t is a struct */ 80 uint32_t p = (*m); 81 for (size_t k = sizeof(p); k > 0; k--) 82 buf[j++] = xtoa(N(p, k - 1)); 83 buf[j] = '\0'; 84 return buf; 85 } 86 87 static __dead void 88 child(const struct timespec *ts) 89 { 90 struct sigaction sa; 91 sigset_t set, oset, nset; 92 char obuf[sizeof(oset) + 3], nbuf[sizeof(nset) + 3]; 93 int fd; 94 95 memset(&sa, 0, sizeof(sa)); 96 sa.sa_handler = sig_handler; 97 if ((fd = open("/dev/null", O_RDONLY)) == -1) 98 err(1, "open"); 99 100 if (sigaction(SIGTERM, &sa, NULL) == -1) 101 err(1, "sigaction"); 102 103 sigfillset(&set); 104 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) 105 err(1, "sigprocmask"); 106 107 if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1) 108 err(1, "sigprocmask"); 109 110 sigemptyset(&set); 111 112 for (;;) { 113 fd_set rset; 114 FD_ZERO(&rset); 115 FD_SET(fd, &rset); 116 if (pselect(1, &rset, NULL, NULL, ts, &set) == -1) { 117 if(errno == EINTR) { 118 if (!keep_going) 119 break; 120 } 121 } 122 if (ts) 123 break; 124 } 125 if (sigprocmask(SIG_BLOCK, NULL, &nset) == -1) 126 err(1, "sigprocmask"); 127 if (memcmp(&oset, &nset, sizeof(oset)) != 0) 128 atf_tc_fail("pselect() masks don't match " 129 "after timeout %s != %s", 130 prmask(&nset, nbuf, sizeof(nbuf)), 131 prmask(&oset, obuf, sizeof(obuf))); 132 _exit(0); 133 } 134 135 ATF_TC(pselect_sigmask); 136 ATF_TC_HEAD(pselect_sigmask, tc) 137 { 138 atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask " 139 "setting when a signal is received (PR lib/43625)"); 140 } 141 142 ATF_TC_BODY(pselect_sigmask, tc) 143 { 144 pid_t pid; 145 int status; 146 147 signal(SIGCHLD, sigchld); 148 149 switch (pid = fork()) { 150 case 0: 151 child(NULL); 152 /*NOTREACHED*/ 153 case -1: 154 err(1, "fork"); 155 default: 156 sleep(1); 157 if (kill(pid, SIGTERM) == -1) 158 err(1, "kill"); 159 sleep(1); 160 switch (waitpid(pid, &status, WNOHANG)) { 161 case -1: 162 err(1, "wait"); 163 case 0: 164 if (kill(pid, SIGKILL) == -1) 165 err(1, "kill"); 166 atf_tc_fail("pselect() did not receive signal"); 167 break; 168 default: 169 break; 170 } 171 } 172 } 173 174 ATF_TC(pselect_timeout); 175 ATF_TC_HEAD(pselect_timeout, tc) 176 { 177 178 atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask " 179 "setting when a timeout occurs"); 180 } 181 182 ATF_TC_BODY(pselect_timeout, tc) 183 { 184 pid_t pid; 185 int status; 186 static const struct timespec zero = { 0, 0 }; 187 188 signal(SIGCHLD, sigchld); 189 190 switch (pid = fork()) { 191 case 0: 192 child(&zero); 193 break; 194 case -1: 195 err(1, "fork"); 196 default: 197 sleep(1); 198 switch (waitpid(pid, &status, WNOHANG)) { 199 case -1: 200 err(1, "wait"); 201 case 0: 202 if (kill(pid, SIGKILL) == -1) 203 err(1, "kill"); 204 atf_tc_fail("pselect() did not receive signal"); 205 break; 206 default: 207 break; 208 } 209 } 210 } 211 212 ATF_TP_ADD_TCS(tp) 213 { 214 215 ATF_TP_ADD_TC(tp, pselect_sigmask); 216 ATF_TP_ADD_TC(tp, pselect_timeout); 217 218 return atf_no_error(); 219 } 220