1 /*- 2 * Copyright (c) 2014 Mark Johnston <markj@FreeBSD.org> 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <err.h> 31 #include <signal.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 static volatile sig_atomic_t saw; 37 38 static void 39 usr1(int sig __unused) 40 { 41 42 saw = 1; 43 } 44 45 void foo(void); 46 void qux(void); 47 48 void 49 foo(void) 50 { 51 } 52 __weak_reference(foo, _foo); 53 54 static void 55 bar(void) 56 { 57 } 58 __strong_reference(bar, baz); 59 60 void 61 qux(void) 62 { 63 } 64 __strong_reference(qux, $qux); 65 66 int 67 main(int argc, char **argv) 68 { 69 70 bar(); /* force the symbol to be emitted */ 71 72 if (argc == 1) 73 return (EXIT_SUCCESS); 74 if (argc == 2 && strcmp(argv[1], "-s") == 0) { 75 if (signal(SIGUSR1, usr1) == SIG_ERR) 76 err(1, "signal"); 77 if (kill(getpid(), SIGUSR1) != 0) 78 err(1, "kill"); 79 return (saw == 1 ? EXIT_SUCCESS : EXIT_FAILURE); 80 } 81 return (EXIT_FAILURE); 82 } 83