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 47 static sig_atomic_t keep_going = 1; 48 49 static void 50 sig_handler(int signum __unused) 51 { 52 keep_going = 0; 53 } 54 55 static void 56 sigchld(int signum __unused) 57 { 58 } 59 60 static char 61 xtoa(uint8_t n) 62 { 63 static const char xarray[] = "0123456789abcdef"; 64 assert(n < sizeof(xarray)); 65 return xarray[n]; 66 } 67 68 static const char * 69 prmask(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 85 static __dead void 86 child(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 } 132 133 ATF_TC(pselect_sigmask); 134 ATF_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 } 139 140 ATF_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 } 171 172 ATF_TC(pselect_timeout); 173 ATF_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 } 179 180 ATF_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 } 209 210 ATF_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