1/* $NetBSD: t_swapcontext.c,v 1.3 2017/01/16 16:27:06 christos Exp $ */
2
3/*
4 * Copyright (c) 2012 Emmanuel Dreyfus. All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__RCSID("$NetBSD");
30
31#include <sys/types.h>
32#include <errno.h>
33#include <pthread.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <ucontext.h>
38
39#include <atf-c.h>
40
41#include "h_common.h"
42
43#define STACKSIZE 65536
44
45char stack[STACKSIZE];
46ucontext_t nctx;
47ucontext_t octx;
48void *oself;
49void *nself;
50int val1, val2;
51
52/* ARGSUSED0 */
53static void
54swapfunc(void *arg)
55{
56	/*
57	 * If the test fails, we are very likely to crash
58	 * without the opportunity to report
59	 */
60	nself = (void *)pthread_self();
61	printf("after swapcontext self = %p\n", nself);
62
63	ATF_REQUIRE_EQ(oself, nself);
64	printf("Test succeeded\n");
65	/* Go back in main */
66	ATF_REQUIRE(swapcontext(&nctx, &octx));
67
68	/* NOTREACHED */
69	return;
70}
71
72/* ARGSUSED0 */
73static void *
74threadfunc(void *arg)
75{
76	nctx.uc_stack.ss_sp = stack;
77	nctx.uc_stack.ss_size = sizeof(stack);
78
79	makecontext(&nctx, (void *)*swapfunc, 0);
80
81	oself = (void *)pthread_self();
82	printf("before swapcontext self = %p\n", oself);
83	ATF_REQUIRE_MSG(swapcontext(&octx, &nctx) != -1, "swapcontext failed: %s",
84	    strerror(errno));
85
86	/* NOTREACHED */
87	return NULL;
88}
89
90
91ATF_TC(swapcontext1);
92ATF_TC_HEAD(swapcontext1, tc)
93{
94	atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
95	    "alters pthread_self()");
96}
97ATF_TC_BODY(swapcontext1, tc)
98{
99	pthread_t thread;
100
101	oself = (void *)&val1;
102	nself = (void *)&val2;
103
104	printf("Testing if swapcontext() alters pthread_self()\n");
105
106	ATF_REQUIRE_MSG(getcontext(&nctx) != -1, "getcontext failed: %s",
107	    strerror(errno));
108	PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
109	PTHREAD_REQUIRE(pthread_join(thread, NULL));
110}
111
112ATF_TP_ADD_TCS(tp)
113{
114	ATF_TP_ADD_TC(tp, swapcontext1);
115
116	return atf_no_error();
117}
118