tests/lib/libc/sys/t_select.c

   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 }