Annotation of src/tests/kernel/h_segv.c, Revision 1.2
1.2 ! christos 1: /* $NetBSD: h_segv.c,v 1.1 2017/12/07 19:46:40 christos Exp $ */
1.1 christos 2:
3: /*-
4: * Copyright (c) 2017 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Christos Zoulas.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
31: #include <sys/cdefs.h>
1.2 ! christos 32: __RCSID("$NetBSD: h_segv.c,v 1.1 2017/12/07 19:46:40 christos Exp $");
1.1 christos 33:
34: #include <stdio.h>
35: #include <string.h>
36: #include <stdlib.h>
37: #include <unistd.h>
38: #include <signal.h>
39: #include <err.h>
40:
41: // A faulting address
42: static int *p = (int *) 0xfefefef0;
43:
44: static int flags;
45: #define F_RECURSE 1
46: #define F_HANDLE 2
47: #define F_MASK 4
48:
49: static struct {
50: const char *n;
51: int v;
52: } nv[] = {
53: { "recurse", F_RECURSE },
54: { "handle", F_HANDLE },
55: { "mask", F_MASK },
56: };
57:
58: static void
59: foo(int s)
60: {
61: char buf[64];
62: int i = snprintf(buf, sizeof(buf), "got %d\n", s);
63: write(2, buf, i);
64: if (flags & F_RECURSE)
65: *p = 0;
66: exit(EXIT_SUCCESS);
67: }
68:
69: static __dead void
70: usage(void)
71: {
1.2 ! christos 72: fprintf(stderr, "Usage: %s recurse|mask|handle ...\n", getprogname());
1.1 christos 73: exit(EXIT_FAILURE);
74: }
75:
76: int
77: main(int argc, char *argv[])
78: {
79: if (argc == 1)
80: usage();
81:
82: for (int i = 1; i < argc; i++) {
83: size_t j;
84: for (j = 0; j < __arraycount(nv); j++)
85: if (strcmp(nv[j].n, argv[i]) == 0) {
86: flags |= nv[j].v;
87: break;
88: }
89: if (j == __arraycount(nv))
90: usage();
91: }
92:
93: if (flags == 0)
94: usage();
95:
96: if (flags & F_HANDLE) {
97: struct sigaction sa;
98:
99: sa.sa_flags = SA_RESTART;
100: sa.sa_handler = foo;
101: sigemptyset(&sa.sa_mask);
102: if (sigaction(SIGSEGV, &sa, NULL) == -1)
103: err(EXIT_FAILURE, "sigaction");
104: }
105:
106: if (flags & F_MASK) {
107: sigset_t set;
108:
109: sigemptyset(&set);
110: sigaddset(&set, SIGSEGV);
111: if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
112: err(EXIT_FAILURE, "sigprocmask");
113: }
114:
115: *p = 1;
116: return EXIT_SUCCESS;
117: }
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