1 /*
2 
3  * Copyright (c) 2002-2003, Intel Corporation. All rights reserved.
4  * Created by:  rusty.lynch REMOVE-THIS AT intel DOT com
5  * This file is licensed under the GPL license.  For the full content
6  * of this license, see the COPYING file at the top level of this
7  * source tree.
8 
9   Test case for assertion #4 of the sigaction system call that shows
10   that attempting to add SIGKILL can not be added to the signal mask
11   for a signal handler.
12 
13   Steps:
14   1. Fork a new process
15   2. (parent) wait for child
16   3. (child) Setup a signal handler for SIGTERM with SIGKILL added to
17              the signal mask
18   4. (child) raise SIGTERM
19   5. (child, signal handler) raise SIGKILL
20   5. (child) If still alive then exit -1
21   6. (parent - returning from wait) If child was killed then return success,
22      otherwise fail.
23 */
24 
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include "posixtest.h"
31 
handler(int signo LTP_ATTRIBUTE_UNUSED)32 void handler(int signo LTP_ATTRIBUTE_UNUSED)
33 {
34 	raise(SIGKILL);
35 	exit(0);
36 }
37 
main(void)38 int main(void)
39 {
40 	if (fork() == 0) {
41 		/* child */
42 
43 		/*
44 		 * NOTE: This block of code will return 0 for error
45 		 *       and anything else for success.
46 		 */
47 
48 		struct sigaction act;
49 
50 		act.sa_handler = handler;
51 		act.sa_flags = 0;
52 		sigemptyset(&act.sa_mask);
53 		sigaddset(&act.sa_mask, SIGKILL);
54 		if (sigaction(SIGTERM, &act, 0) == -1) {
55 			perror("Unexpected error while attempting to "
56 			       "setup test pre-conditions");
57 			return PTS_PASS;
58 		}
59 
60 		if (raise(SIGTERM) == -1) {
61 			perror("Unexpected error while attempting to "
62 			       "setup test pre-conditions");
63 		}
64 
65 		return PTS_PASS;
66 	} else {
67 		int s;
68 
69 		/* parent */
70 		if (wait(&s) == -1) {
71 			perror("Unexpected error while setting up test "
72 			       "pre-conditions");
73 			return PTS_UNRESOLVED;
74 		}
75 
76 		if (!WIFEXITED(s)) {
77 			printf("Test PASSED\n");
78 			return PTS_PASS;
79 		}
80 	}
81 
82 	printf("Test FAILED\n");
83 	return PTS_FAIL;
84 }
85