1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2023 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <signal.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <stdbool.h>
40
41 #define HANDLER_NOT_CALLED 0
42 #define HANDLER_SUCCESS 1
43 #define HANDLER_FAILED 2
44
45 static sig_atomic_t handler_result;
46 static sig_atomic_t handler_sig_expect;
47 static sig_atomic_t handler_sig_received;
48
49 static void
signal_handler(int sig)50 signal_handler(int sig)
51 {
52 handler_sig_received = sig;
53 if (sig == (int) handler_sig_expect)
54 handler_result = HANDLER_SUCCESS;
55 else
56 handler_result = HANDLER_FAILED;
57 }
58
59 static const int test_signals[] = {
60 SIGABRT,
61 SIGFPE,
62 SIGILL,
63 SIGINT,
64 SIGSEGV,
65 SIGTERM,
66 };
67
68 #define MODE_IGN 0
69 #define MODE_CATCH 1
70 #define MODE_MAX 2
71
72 #define NTEST_SIG (sizeof(test_signals)/sizeof(test_signals[0]))
73
main(void)74 int main(void)
75 {
76 void (*old_func)(int);
77 void (*new_func)(int);
78 void (*prev_func)(int);
79 int ret;
80 unsigned u;
81 int fail = 0;
82 int mode;
83
84 for (u = 0; u < NTEST_SIG; u++) {
85 int sig = test_signals[u];
86 prev_func = SIG_DFL;
87 for (mode = 0; mode < MODE_MAX; mode++) {
88 switch (mode) {
89 case MODE_IGN:
90 new_func = SIG_IGN;
91 break;
92 case MODE_CATCH:
93 new_func = signal_handler;
94 break;
95 }
96
97 /* Set up the signal handler */
98 old_func = signal(sig, new_func);
99 if (old_func != SIG_DFL) {
100 printf("signal %d: old_func was %p, not SIG_DFL\n",
101 sig, old_func);
102 fail = 1;
103 }
104
105 /* Invoke the handler */
106 prev_func = new_func;
107 handler_result = HANDLER_NOT_CALLED;
108 handler_sig_expect = (sig_atomic_t) sig;
109
110 ret = raise(sig);
111 if (ret != 0) {
112 printf("signal %d: raise returned %d\n", sig, ret);
113 fail = 1;
114 }
115
116 /* Validate the results */
117 switch (mode) {
118 case MODE_IGN:
119 if (handler_result != HANDLER_NOT_CALLED) {
120 printf("signal %d: handler called with SIG_IGN\n", sig);
121 fail = 1;
122 }
123 break;
124 case MODE_CATCH:
125 switch (handler_result) {
126 case HANDLER_NOT_CALLED:
127 printf("signal %d: handler not called\n", sig);
128 fail = 1;
129 break;
130 case HANDLER_SUCCESS:
131 prev_func = SIG_DFL;
132 break;
133 case HANDLER_FAILED:
134 printf("signal %d: handler failed, received signal %d\n",
135 sig, (int) handler_sig_received);
136 fail = 1;
137 break;
138 }
139 break;
140 default:
141 fail = 1;
142 break;
143 }
144
145 old_func = signal(sig, SIG_DFL);
146 if (old_func != prev_func) {
147 printf("signal %d: after test, signal is %p expected %p\n",
148 sig, old_func, prev_func);
149 fail = 1;
150 }
151 }
152 }
153 exit(fail);
154 }
155
