1 /* 2 * Copyright (c) 1998 Daniel M. Eischen <eischen@vigrid.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Daniel M. Eischen. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY DANIEL M. EISCHEN AND CONTRIBUTORS ``AS IS'' 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/lib/libc_r/test/sigsuspend_d.c,v 1.1.2.1 2000/07/17 22:18:32 jasone Exp $ 33 */ 34 #include <stdlib.h> 35 #include <unistd.h> 36 37 #include <errno.h> 38 #include <pthread.h> 39 #include <pthread_np.h> 40 #include <signal.h> 41 #include <stdio.h> 42 #include <string.h> 43 44 static int sigcounts[NSIG + 1]; 45 static int sigfifo[NSIG + 1]; 46 static int fifo_depth = 0; 47 static sigset_t suspender_mask; 48 static pthread_t suspender_tid; 49 50 51 static void * 52 sigsuspender (void *arg) 53 { 54 int status, i; 55 sigset_t run_mask; 56 57 /* Run with all signals blocked. */ 58 sigfillset (&run_mask); 59 sigprocmask (SIG_SETMASK, &run_mask, NULL); 60 61 /* Allow these signals to wake us up during a sigsuspend. */ 62 sigfillset (&suspender_mask); /* Default action */ 63 sigdelset (&suspender_mask, SIGINT); /* terminate */ 64 sigdelset (&suspender_mask, SIGHUP); /* terminate */ 65 sigdelset (&suspender_mask, SIGQUIT); /* create core image */ 66 sigdelset (&suspender_mask, SIGURG); /* ignore */ 67 sigdelset (&suspender_mask, SIGIO); /* ignore */ 68 sigdelset (&suspender_mask, SIGUSR2); /* terminate */ 69 70 while (sigcounts[SIGINT] == 0) { 71 status = sigsuspend (&suspender_mask); 72 if ((status == 0) || (errno != EINTR)) { 73 fprintf (stderr, "Unable to suspend for signals, " 74 "errno %d, return value %d\n", 75 errno, status); 76 exit (1); 77 } 78 for (i = 0; i < fifo_depth; i++) 79 fprintf (stderr, "Sigsuspend woke up by signal %d\n", 80 sigfifo[i]); 81 fifo_depth = 0; 82 } 83 84 pthread_exit (arg); 85 return (NULL); 86 } 87 88 89 static void 90 sighandler (int signo) 91 { 92 sigset_t set, suspend_set; 93 pthread_t self; 94 95 if ((signo >= 0) && (signo <= NSIG)) 96 sigcounts[signo]++; 97 98 /* 99 * If we are running on behalf of the suspender thread, 100 * ensure that we have the correct mask set. 101 */ 102 self = pthread_self (); 103 if (self == suspender_tid) { 104 sigfifo[fifo_depth] = signo; 105 fifo_depth++; 106 fprintf (stderr, 107 " -> Suspender thread signal handler caught signal %d\n", 108 signo); 109 110 /* Get the current signal mask. */ 111 sigprocmask (SIG_SETMASK, NULL, &set); 112 113 /* The handler should run with the current signal masked. */ 114 suspend_set = suspender_mask; 115 sigaddset(&suspend_set, signo); 116 117 if (memcmp(&set, &suspend_set, sizeof(set))) 118 fprintf (stderr, 119 " >>> FAIL: sigsuspender signal handler running " 120 "with incorrect mask.\n"); 121 } 122 else 123 fprintf (stderr, 124 " -> Main thread signal handler caught signal %d\n", 125 signo); 126 } 127 128 129 static void 130 send_thread_signal (pthread_t tid, int signo) 131 { 132 if (pthread_kill (tid, signo) != 0) { 133 fprintf (stderr, "Unable to send thread signal, errno %d.\n", 134 errno); 135 exit (1); 136 } 137 } 138 139 140 static void 141 send_process_signal (int signo) 142 { 143 if (kill (getpid (), signo) != 0) { 144 fprintf (stderr, "Unable to send process signal, errno %d.\n", 145 errno); 146 exit (1); 147 } 148 } 149 150 151 int main (int argc, char *argv[]) 152 { 153 pthread_attr_t pattr; 154 void * exit_status; 155 struct sigaction act; 156 sigset_t oldset; 157 sigset_t newset; 158 159 /* Initialize our signal counts. */ 160 memset ((void *) sigcounts, 0, NSIG * sizeof (int)); 161 162 /* Ignore signal SIGIO. */ 163 sigemptyset (&act.sa_mask); 164 sigaddset (&act.sa_mask, SIGIO); 165 act.sa_handler = SIG_IGN; 166 act.sa_flags = 0; 167 sigaction (SIGIO, &act, NULL); 168 169 /* Install a signal handler for SIGURG. */ 170 sigemptyset (&act.sa_mask); 171 sigaddset (&act.sa_mask, SIGURG); 172 act.sa_handler = sighandler; 173 act.sa_flags = SA_RESTART; 174 sigaction (SIGURG, &act, NULL); 175 176 /* Install a signal handler for SIGXCPU */ 177 sigemptyset (&act.sa_mask); 178 sigaddset (&act.sa_mask, SIGXCPU); 179 sigaction (SIGXCPU, &act, NULL); 180 181 /* Get our current signal mask. */ 182 sigprocmask (SIG_SETMASK, NULL, &oldset); 183 184 /* Mask out SIGUSR1 and SIGUSR2. */ 185 newset = oldset; 186 sigaddset (&newset, SIGUSR1); 187 sigaddset (&newset, SIGUSR2); 188 sigprocmask (SIG_SETMASK, &newset, NULL); 189 190 /* Install a signal handler for SIGUSR1 */ 191 sigemptyset (&act.sa_mask); 192 sigaddset (&act.sa_mask, SIGUSR1); 193 sigaction (SIGUSR1, &act, NULL); 194 195 /* Install a signal handler for SIGUSR2 */ 196 sigemptyset (&act.sa_mask); 197 sigaddset (&act.sa_mask, SIGUSR2); 198 sigaction (SIGUSR2, &act, NULL); 199 200 /* 201 * Initialize the thread attribute. 202 */ 203 if ((pthread_attr_init (&pattr) != 0) || 204 (pthread_attr_setdetachstate (&pattr, 205 PTHREAD_CREATE_JOINABLE) != 0)) { 206 fprintf (stderr, "Unable to initialize thread attributes.\n"); 207 exit (1); 208 } 209 210 /* 211 * Create the sigsuspender thread. 212 */ 213 if (pthread_create (&suspender_tid, &pattr, sigsuspender, NULL) != 0) { 214 fprintf (stderr, "Unable to create thread, errno %d.\n", errno); 215 exit (1); 216 } 217 pthread_set_name_np (suspender_tid, "sigsuspender"); 218 219 /* 220 * Verify that an ignored signal doesn't cause a wakeup. 221 * We don't have a handler installed for SIGIO. 222 */ 223 send_thread_signal (suspender_tid, SIGIO); 224 sleep (1); 225 send_process_signal (SIGIO); 226 sleep (1); 227 if (sigcounts[SIGIO] != 0) 228 fprintf (stderr, "FAIL: sigsuspend wakes up for ignored signal " 229 "SIGIO.\n"); 230 231 /* 232 * Verify that a signal with a default action of ignore, for 233 * which we have a signal handler installed, will release a 234 * sigsuspend. 235 */ 236 send_thread_signal (suspender_tid, SIGURG); 237 sleep (1); 238 send_process_signal (SIGURG); 239 sleep (1); 240 if (sigcounts[SIGURG] != 2) 241 fprintf (stderr, 242 "FAIL: sigsuspend doesn't wake up for SIGURG.\n"); 243 244 /* 245 * Verify that a SIGUSR2 signal will release a sigsuspended 246 * thread. 247 */ 248 send_thread_signal (suspender_tid, SIGUSR2); 249 sleep (1); 250 send_process_signal (SIGUSR2); 251 sleep (1); 252 if (sigcounts[SIGUSR2] != 2) 253 fprintf (stderr, 254 "FAIL: sigsuspend doesn't wake up for SIGUSR2.\n"); 255 256 /* 257 * Verify that a signal, blocked in both the main and 258 * sigsuspender threads, does not cause the signal handler 259 * to be called. 260 */ 261 send_thread_signal (suspender_tid, SIGUSR1); 262 sleep (1); 263 send_process_signal (SIGUSR1); 264 sleep (1); 265 if (sigcounts[SIGUSR1] != 0) 266 fprintf (stderr, "FAIL: signal hander called for SIGUSR1.\n"); 267 268 /* 269 * Verify that we can still kill the process for a signal 270 * not being waited on by sigwait. 271 */ 272 send_process_signal (SIGPIPE); 273 fprintf (stderr, "FAIL: SIGPIPE did not terminate process.\n"); 274 275 /* 276 * Wait for the thread to finish. 277 */ 278 pthread_join (suspender_tid, &exit_status); 279 280 return (0); 281 } 282