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 #include <err.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 static volatile sig_atomic_t saw;
35
36 static void
usr1(int sig __unused)37 usr1(int sig __unused)
38 {
39
40 saw = 1;
41 }
42
43 void foo(void);
44 void qux(void);
45
46 void
foo(void)47 foo(void)
48 {
49 }
50 __weak_reference(foo, _foo);
51
52 static void
bar(void)53 bar(void)
54 {
55 }
56 __strong_reference(bar, baz);
57
58 void
qux(void)59 qux(void)
60 {
61 }
62 __strong_reference(qux, $qux);
63
64 int
main(int argc,char ** argv)65 main(int argc, char **argv)
66 {
67
68 bar(); /* force the symbol to be emitted */
69
70 if (argc == 1)
71 return (EXIT_SUCCESS);
72 if (argc == 2 && strcmp(argv[1], "-s") == 0) {
73 if (signal(SIGUSR1, usr1) == SIG_ERR)
74 err(1, "signal");
75 if (kill(getpid(), SIGUSR1) != 0)
76 err(1, "kill");
77 return (saw == 1 ? EXIT_SUCCESS : EXIT_FAILURE);
78 }
79 return (EXIT_FAILURE);
80 }
81