1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18 #include <signal.h>
19 #include <setjmp.h>
20
21 static sigjmp_buf sbuf;
22
handler(int sig)23 void handler(int sig)
24 {
25 printf("In handler()\n");
26 siglongjmp(sbuf, 99);
27 printf("After calling siglongjmp, but you won't see me here.\n");
28 }
29
foo()30 void foo()
31 {
32 struct sigaction sact;
33 sigset_t sset;
34 printf("In foo()\n");
35
36 /* Setup signal handler for SIGUSR2 */
37 sigemptyset(&sact.sa_mask);
38 sact.sa_flags = 0;
39 sact.sa_handler = handler;
40 sigaction(SIGUSR2, &sact, NULL);
41
42 /* Unblock SIGUSR2 */
43 sigemptyset(&sset);
44 sigaddset(&sset, SIGUSR2);
45 sigprocmask(SIG_UNBLOCK, &sset, NULL);
46
47 /* Action */
48 kill(getpid(), SIGUSR2);
49
50 printf("After calling kill, but you won't see me here.\n");
51 }
52
bar()53 void bar()
54 {
55 printf("In bar()\n");
56 foo();
57 printf("After calling foo, but you won't see me here.\n");
58 }
59
main()60 int main()
61 {
62 int code, ret;
63 sigset_t sset;
64 printf("In main()\n");
65 sigemptyset(&sset);
66 sigaddset(&sset, SIGUSR1);
67 sigaddset(&sset, SIGUSR2);
68 sigprocmask(SIG_SETMASK, &sset, NULL);
69 if ((code = sigsetjmp(sbuf, 1)) == 0)
70 {
71 bar();
72 ret = 0xDEADBEEF;
73 }
74 else
75 {
76 printf("siglongjmp() back to main, code = %d\n", code);
77 /* Make sure SIGUSR2 still blocked */
78 sigprocmask(SIG_SETMASK, NULL, &sset);
79 ret = sigismember(&sset, SIGUSR2)? 0 : -1;
80 }
81 printf("ret = %d\n", ret);
82
83 return ret;
84 }
85