tests/lib/libpthread/t_sigmask.c

   1 /* $NetBSD: t_sigmask.c,v 1.2 2010/11/03 16:10:22 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 1.2 2010/11/03 16:10:22 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         int ret;
 111
 112         act.sa_sigaction = upcalls_not_started_handler1;
 113         sigemptyset(&act.sa_mask);
 114         sigaddset(&act.sa_mask, SIGUSR2);
 115         act.sa_flags = SA_SIGINFO;
 116
 117         ATF_REQUIRE_EQ(sigaction(SIGUSR1, &act, NULL), 0);
 118
 119         act.sa_sigaction = upcalls_not_started_handler2;
 120         sigemptyset(&act.sa_mask);
 121         act.sa_flags = SA_SIGINFO;
 122         ret = sigaction(SIGUSR2, &act, NULL);
 123
 124         kill(getpid(), SIGUSR1);
 125
 126         ATF_REQUIRE_EQ(flag, 2);
 127         printf("Success: Both handlers ran in order\n");
 128 }
 129
 130 static void
 131 respected_while_running_handler1(int sig, siginfo_t *info, void *ctx)
 132 {
 133
 134         kill(getpid(), SIGUSR2);
 135         /*
 136          * If the mask is properly set, SIGUSR2 will not be handled
 137          * by the current thread until this handler returns.
 138          */
 139         flag = 1;
 140         thr_usr1 = pthread_self();
 141 }
 142
 143 static void
 144 respected_while_running_handler2(int sig, siginfo_t *info, void *ctx)
 145 {
 146         if (flag == 1)
 147                 flag = 2;
 148         flag2 = 1;
 149         thr_usr2 = pthread_self();
 150 }
 151
 152 static void *
 153 respected_while_running_threadroutine(void *arg)
 154 {
 155
 156         kill(getpid(), SIGUSR1);
 157         sleep(1);
 158
 159         if (flag == 2)
 160                 printf("Success: Both handlers ran in order\n");
 161         else if (flag == 1 && flag2 == 1 && thr_usr1 != thr_usr2)
 162                 printf("Success: Handlers were invoked by different threads\n");
 163         else {
 164                 printf("Failure: flag=%d, flag2=%d, thr1=%p, thr2=%p\n",
 165                         (int)flag, (int)flag2, (void *)thr_usr1, (void *)thr_usr2);
 166                 atf_tc_fail("failure");
 167         }
 168
 169         return NULL;
 170 }
 171
 172 ATF_TC(respected_while_running);
 173 ATF_TC_HEAD(respected_while_running, tc)
 174 {
 175         atf_tc_set_md_var(tc, "descr", "Checks that signal masks are respected "
 176             "while threads are running");
 177 }
 178 ATF_TC_BODY(respected_while_running, tc)
 179 {
 180         struct sigaction act;
 181         pthread_t thread;
 182         int rv;
 183
 184         act.sa_sigaction = respected_while_running_handler1;
 185         sigemptyset(&act.sa_mask);
 186         sigaddset(&act.sa_mask, SIGUSR2);
 187         act.sa_flags = SA_SIGINFO;
 188
 189         ATF_REQUIRE_EQ(sigaction(SIGUSR1, &act, NULL), 0);
 190
 191         act.sa_sigaction = respected_while_running_handler2;
 192         sigemptyset(&act.sa_mask);
 193         act.sa_flags = SA_SIGINFO;
 194         rv = sigaction(SIGUSR2, &act, NULL);
 195
 196         PTHREAD_REQUIRE(pthread_create(&thread, NULL,
 197             respected_while_running_threadroutine, NULL));
 198         PTHREAD_REQUIRE(pthread_join(thread, NULL));
 199 }
 200
 201 static void
 202 incorrect_mask_bug_handler(int sig)
 203 {
 204         count++;
 205 }
 206
 207 static void *
 208 incorrect_mask_bug_sleeper(void* arg)
 209 {
 210         int i;
 211         for (i = 0; i < 10; i++)
 212                 sleep(1);
 213
 214         atf_tc_fail("sleeper");
 215 }
 216
 217 ATF_TC(incorrect_mask_bug);
 218 ATF_TC_HEAD(incorrect_mask_bug, tc)
 219 {
 220         atf_tc_set_md_var(tc, "descr", "Checks for bug in libpthread where "
 221             "incorrect signal mask was used");
 222 }
 223 ATF_TC_BODY(incorrect_mask_bug, tc)
 224 {
 225         pthread_t id;
 226         struct sigaction act;
 227
 228         act.sa_sigaction = NULL;
 229         sigemptyset(&act.sa_mask);
 230         act.sa_flags = 0;
 231         act.sa_handler = incorrect_mask_bug_handler;
 232
 233         ATF_REQUIRE_EQ_MSG(sigaction(SIGALRM, &act, NULL), 0, "%s",
 234             strerror(errno));
 235
 236         sigaddset(&act.sa_mask, SIGALRM);
 237         PTHREAD_REQUIRE(pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL));
 238
 239         PTHREAD_REQUIRE(pthread_create(&id, NULL, incorrect_mask_bug_sleeper,
 240             NULL));
 241         sleep(1);
 242
 243         sigemptyset(&act.sa_mask);
 244         PTHREAD_REQUIRE(pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL));
 245
 246         for (;;) {
 247                 alarm(1);
 248                 if (select(1, NULL, NULL, NULL, NULL) == -1 && errno == EINTR)
 249                         if (count == 2)
 250                                 return;
 251         }
 252 }
 253
 254 ATF_TP_ADD_TCS(tp)
 255 {
 256
 257         ATF_TP_ADD_TC(tp, upcalls_not_started);
 258         ATF_TP_ADD_TC(tp, before_threads);
 259         ATF_TP_ADD_TC(tp, respected_while_running);
 260         ATF_TP_ADD_TC(tp, incorrect_mask_bug);
 261
 262         return atf_no_error();
 263 }