t_swapcontext.c revision 1.7 
1/* $NetBSD: t_swapcontext.c,v 1.7 2018/02/27 20:34:04 uwe 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
52static void
53swapfunc(void)
54{
55	/*
56	 * If the test fails, we are very likely to crash
57	 * without the opportunity to report
58	 */
59	nself = (void *)pthread_self();
60	printf("after swapcontext self = %p\n", nself);
61
62	ATF_REQUIRE_EQ(oself, nself);
63	printf("Test succeeded\n");
64	/* Go back in main */
65	ATF_REQUIRE(swapcontext(&nctx, &octx));
66
67	/* NOTREACHED */
68	return;
69}
70
71/* ARGSUSED0 */
72static void *
73threadfunc(void *arg)
74{
75	nctx.uc_stack.ss_sp = stack;
76	nctx.uc_stack.ss_size = sizeof(stack);
77
78	makecontext(&nctx, swapfunc, 0);
79
80	oself = (void *)pthread_self();
81	printf("before swapcontext self = %p\n", oself);
82	ATF_REQUIRE_MSG(swapcontext(&octx, &nctx) != -1, "swapcontext failed: %s",
83	    strerror(errno));
84
85	return NULL;
86}
87
88
89ATF_TC(swapcontext1);
90ATF_TC_HEAD(swapcontext1, tc)
91{
92	atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
93	    "alters pthread_self()");
94}
95ATF_TC_BODY(swapcontext1, tc)
96{
97	pthread_t thread;
98
99	oself = (void *)&val1;
100	nself = (void *)&val2;
101
102	printf("Testing if swapcontext() alters pthread_self()\n");
103
104	ATF_REQUIRE_MSG(getcontext(&nctx) != -1, "getcontext failed: %s",
105	    strerror(errno));
106	PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
107	PTHREAD_REQUIRE(pthread_join(thread, NULL));
108}
109
110ATF_TP_ADD_TCS(tp)
111{
112	ATF_TP_ADD_TC(tp, swapcontext1);
113
114	return atf_no_error();
115}
116