t_select.c revision 1.3
1 /* $NetBSD: t_select.c,v 1.3 2012/03/18 07:00:52 jruoho 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) 51 { 52 keep_going = 0; 53 } 54 55 static void 56 sigchld(int signum) 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 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 } 131 132 ATF_TC(pselect_sigmask); 133 ATF_TC_HEAD(pselect_sigmask, tc) 134 { 135 atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask " 136 "setting when a signal is received (PR lib/43625)"); 137 } 138 139 ATF_TC_BODY(pselect_sigmask, tc) 140 { 141 pid_t pid; 142 int status; 143 144 signal(SIGCHLD, sigchld); 145 146 switch (pid = fork()) { 147 case 0: 148 child(NULL); 149 case -1: 150 err(1, "fork"); 151 default: 152 sleep(1); 153 if (kill(pid, SIGTERM) == -1) 154 err(1, "kill"); 155 sleep(1); 156 switch (waitpid(pid, &status, WNOHANG)) { 157 case -1: 158 err(1, "wait"); 159 case 0: 160 if (kill(pid, SIGKILL) == -1) 161 err(1, "kill"); 162 atf_tc_fail("pselect() did not receive signal"); 163 break; 164 default: 165 break; 166 } 167 } 168 } 169 170 ATF_TC(pselect_timeout); 171 ATF_TC_HEAD(pselect_timeout, tc) 172 { 173 174 atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask " 175 "setting when a timeout occurs"); 176 } 177 178 ATF_TC_BODY(pselect_timeout, tc) 179 { 180 pid_t pid; 181 int status; 182 static const struct timespec zero = { 0, 0 }; 183 184 signal(SIGCHLD, sigchld); 185 186 switch (pid = fork()) { 187 case 0: 188 child(&zero); 189 break; 190 case -1: 191 err(1, "fork"); 192 default: 193 sleep(1); 194 switch (waitpid(pid, &status, WNOHANG)) { 195 case -1: 196 err(1, "wait"); 197 case 0: 198 if (kill(pid, SIGKILL) == -1) 199 err(1, "kill"); 200 atf_tc_fail("pselect() did not receive signal"); 201 break; 202 default: 203 break; 204 } 205 } 206 } 207 208 ATF_TP_ADD_TCS(tp) 209 { 210 211 ATF_TP_ADD_TC(tp, pselect_sigmask); 212 ATF_TP_ADD_TC(tp, pselect_timeout); 213 214 return atf_no_error(); 215 } 216
Indexes created Thu Oct 02 07:10:07 GMT 2025