tests/lib/libpthread/t_sigmask.c

   1 /* $NetBSD: t_sigmask.c,v 1.3 2013/10/19 17:45:01 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __COPYRIGHT("@(#) Copyright (c) 2008, 2010\
  31  The NetBSD Foundation, inc. All rights reserved.");
  32 __RCSID("$NetBSD: t_sigmask.c,v 1.3 2013/10/19 17:45:01 christos Exp $");
  33
  34 /*
  35  * Regression test for pthread_sigmask when SA upcalls aren't started yet.
  36  *
  37  * Written by Christian Limpach <cl@NetBSD.org>, December 2003.
  38  * Public domain.
  39  */
  40
  41 #include <errno.h>
  42 #include <pthread.h>
  43 #include <signal.h>
  44 #include <stdio.h>
  45 #include <unistd.h>
  46
  47 #include <sys/resource.h>
  48
  49 #include <atf-c.h>
  50
  51 #include "h_common.h"
  52
  53 static volatile sig_atomic_t flag;
  54 static volatile sig_atomic_t flag2;
  55
  56 static volatile pthread_t thr_usr1;
  57 static volatile pthread_t thr_usr2;
  58
  59 static sig_atomic_t count = 0;
  60
  61 ATF_TC(upcalls_not_started);
  62 ATF_TC_HEAD(upcalls_not_started, tc)
  63 {
  64         atf_tc_set_md_var(tc, "descr", "Checks pthread_sigmask when SA upcalls "
  65             "aren't started yet");
  66 }
  67 ATF_TC_BODY(upcalls_not_started, tc)
  68 {
  69         sigset_t nset;
  70         struct rlimit rlim;
  71
  72         rlim.rlim_cur = rlim.rlim_max = 0;
  73         (void) setrlimit(RLIMIT_CORE, &rlim);
  74
  75         sigemptyset(&nset);
  76         sigaddset(&nset, SIGFPE);
  77         pthread_sigmask(SIG_BLOCK, &nset, NULL);
  78
  79         kill(getpid(), SIGFPE);
  80 }
  81
  82 static void
  83 upcalls_not_started_handler1(int sig, siginfo_t *info, void *ctx)
  84 {
  85
  86         kill(getpid(), SIGUSR2);
  87         /*
  88          * If the mask is properly set, SIGUSR2 will not be handled
  89          * until this handler returns.
  90          */
  91         flag = 1;
  92 }
  93
  94 static void
  95 upcalls_not_started_handler2(int sig, siginfo_t *info, void *ctx)
  96 {
  97         if (flag == 1)
  98                 flag = 2;
  99 }
 100
 101 ATF_TC(before_threads);
 102 ATF_TC_HEAD(before_threads, tc)
 103 {
 104         atf_tc_set_md_var(tc, "descr", "Checks that signal masks are respected "
 105             "before threads are started");
 106 }
 107 ATF_TC_BODY(before_threads, tc)
 108 {
 109         struct sigaction act;
 110
 111         act.sa_sigaction = upcalls_not_started_handler1;
 112         sigemptyset(&act.sa_mask);
 113         sigaddset(&act.sa_mask, SIGUSR2);
 114         act.sa_flags = SA_SIGINFO;
 115
 116         ATF_REQUIRE_EQ(sigaction(SIGUSR1, &act, NULL), 0);
 117
 118         act.sa_sigaction = upcalls_not_started_handler2;
 119         sigemptyset(&act.sa_mask);
 120         act.sa_flags = SA_SIGINFO;
 121         (void)sigaction(SIGUSR2, &act, NULL);
 122
 123         kill(getpid(), SIGUSR1);
 124
 125         ATF_REQUIRE_EQ(flag, 2);
 126         printf("Success: Both handlers ran in order\n");
 127 }
 128
 129 static void
 130 respected_while_running_handler1(int sig, siginfo_t *info, void *ctx)
 131 {
 132
 133         kill(getpid(), SIGUSR2);
 134         /*
 135          * If the mask is properly set, SIGUSR2 will not be handled
 136          * by the current thread until this handler returns.
 137          */
 138         flag = 1;
 139         thr_usr1 = pthread_self();
 140 }
 141
 142 static void
 143 respected_while_running_handler2(int sig, siginfo_t *info, void *ctx)
 144 {
 145         if (flag == 1)
 146                 flag = 2;
 147         flag2 = 1;
 148         thr_usr2 = pthread_self();
 149 }
 150
 151 static void *
 152 respected_while_running_threadroutine(void *arg)
 153 {
 154
 155         kill(getpid(), SIGUSR1);
 156         sleep(1);
 157
 158         if (flag == 2)
 159                 printf("Success: Both handlers ran in order\n");
 160         else if (flag == 1 && flag2 == 1 && thr_usr1 != thr_usr2)
 161                 printf("Success: Handlers were invoked by different threads\n");
 162         else {
 163                 printf("Failure: flag=%d, flag2=%d, thr1=%p, thr2=%p\n",
 164                         (int)flag, (int)flag2, (void *)thr_usr1, (void *)thr_usr2);
 165                 atf_tc_fail("failure");
 166         }
 167
 168         return NULL;
 169 }
 170
 171 ATF_TC(respected_while_running);
 172 ATF_TC_HEAD(respected_while_running, tc)
 173 {
 174         atf_tc_set_md_var(tc, "descr", "Checks that signal masks are respected "
 175             "while threads are running");
 176 }
 177 ATF_TC_BODY(respected_while_running, tc)
 178 {
 179         struct sigaction act;
 180         pthread_t thread;
 181
 182         act.sa_sigaction = respected_while_running_handler1;
 183         sigemptyset(&act.sa_mask);
 184         sigaddset(&act.sa_mask, SIGUSR2);
 185         act.sa_flags = SA_SIGINFO;
 186
 187         ATF_REQUIRE_EQ(sigaction(SIGUSR1, &act, NULL), 0);
 188
 189         act.sa_sigaction = respected_while_running_handler2;
 190         sigemptyset(&act.sa_mask);
 191         act.sa_flags = SA_SIGINFO;
 192         (void)sigaction(SIGUSR2, &act, NULL);
 193
 194         PTHREAD_REQUIRE(pthread_create(&thread, NULL,
 195             respected_while_running_threadroutine, NULL));
 196         PTHREAD_REQUIRE(pthread_join(thread, NULL));
 197 }
 198
 199 static void
 200 incorrect_mask_bug_handler(int sig)
 201 {
 202         count++;
 203 }
 204
 205 static void *
 206 incorrect_mask_bug_sleeper(void* arg)
 207 {
 208         int i;
 209         for (i = 0; i < 10; i++)
 210                 sleep(1);
 211
 212         atf_tc_fail("sleeper");
 213 }
 214
 215 ATF_TC(incorrect_mask_bug);
 216 ATF_TC_HEAD(incorrect_mask_bug, tc)
 217 {
 218         atf_tc_set_md_var(tc, "descr", "Checks for bug in libpthread where "
 219             "incorrect signal mask was used");
 220 }
 221 ATF_TC_BODY(incorrect_mask_bug, tc)
 222 {
 223         pthread_t id;
 224         struct sigaction act;
 225
 226         act.sa_sigaction = NULL;
 227         sigemptyset(&act.sa_mask);
 228         act.sa_flags = 0;
 229         act.sa_handler = incorrect_mask_bug_handler;
 230
 231         ATF_REQUIRE_EQ_MSG(sigaction(SIGALRM, &act, NULL), 0, "%s",
 232             strerror(errno));
 233
 234         sigaddset(&act.sa_mask, SIGALRM);
 235         PTHREAD_REQUIRE(pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL));
 236
 237         PTHREAD_REQUIRE(pthread_create(&id, NULL, incorrect_mask_bug_sleeper,
 238             NULL));
 239         sleep(1);
 240
 241         sigemptyset(&act.sa_mask);
 242         PTHREAD_REQUIRE(pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL));
 243
 244         for (;;) {
 245                 alarm(1);
 246                 if (select(1, NULL, NULL, NULL, NULL) == -1 && errno == EINTR)
 247                         if (count == 2)
 248                                 return;
 249         }
 250 }
 251
 252 ATF_TP_ADD_TCS(tp)
 253 {
 254
 255         ATF_TP_ADD_TC(tp, upcalls_not_started);
 256         ATF_TP_ADD_TC(tp, before_threads);
 257         ATF_TP_ADD_TC(tp, respected_while_running);
 258         ATF_TP_ADD_TC(tp, incorrect_mask_bug);
 259
 260         return atf_no_error();
 261 }