1/*
2 * Copyright (c) 2002-2003, Intel Corporation. All rights reserved.
3 * Created by:  rusty.lynch REMOVE-THIS AT intel DOT com
4 * This file is licensed under the GPL license.  For the full content
5 * of this license, see the COPYING file at the top level of this
6 * source tree.
7
8  Test case for assertion #25 of the sigaction system call that verifies
9  that when the sa_sigaction signal-catching function is entered, then
10  the signal that was caught is added to the signal mask by raising that
11  signal in the signal handler and verifying that the handler is not
12  reentered.
13
14  Steps:
15  1. Fork a new process
16  2. (parent) wait for child
17  3. (child) Setup a signal handler for SIGSEGV
18  4. (child) raise SIGSEGV
19  5. (child, signal handler) increment handler count
20  6. (child, signal handler) if count is 1 then raise SIGSEGV
21  7. (child, signal handler) if count is 2 then set error variable
22  8. (child) if error is set then return -1, else return 0
23  6. (parent - returning from wait) If child returned 0 then exit 0,
24     otherwise exit -1.
25*/
26
27#include <signal.h>
28#include <stdio.h>
29#include <stdlib.h>
30#include <sys/wait.h>
31#include <unistd.h>
32#include "posixtest.h"
33
34int handler_count = 0;
35int handler_error = 0;
36
37void handler(int signo)
38{
39	static int inside_handler = 0;
40
41	printf("SIGSEGV caught\n");
42	if (inside_handler) {
43		printf("Signal caught while inside handler\n");
44		handler_error++;
45		exit(-1);
46	}
47
48	inside_handler++;
49	handler_count++;
50
51	if (handler_count == 1) {
52		printf("Raising SIGSEGV\n");
53		raise(SIGSEGV);
54		printf("Returning from raising SIGSEGV\n");
55	}
56
57	inside_handler--;
58}
59
60int main(void)
61{
62	if (fork() == 0) {
63		/* child */
64
65		struct sigaction act;
66
67		act.sa_handler = handler;
68		act.sa_flags = 0;
69		sigemptyset(&act.sa_mask);
70		if (sigaction(SIGSEGV, &act, 0) == -1) {
71			perror("Unexpected error while attempting to "
72			       "setup test pre-conditions");
73			return PTS_UNRESOLVED;
74		}
75
76		if (raise(SIGSEGV) == -1) {
77			perror("Unexpected error while attempting to "
78			       "setup test pre-conditions");
79			return PTS_UNRESOLVED;
80		}
81
82		if (handler_error)
83			return PTS_UNRESOLVED;
84
85		return PTS_PASS;
86	} else {
87		int s;
88
89		/* parent */
90		if (wait(&s) == -1) {
91			perror("Unexpected error while setting up test "
92			       "pre-conditions");
93			return PTS_UNRESOLVED;
94		}
95
96		if (!WEXITSTATUS(s)) {
97			printf("Test PASSED\n");
98			return PTS_PASS;
99		}
100	}
101
102	printf("Test FAILED\n");
103	return PTS_FAIL;
104}
105