1 /* $NetBSD: t_swapcontext.c,v 1.2 2014/08/25 16:31:15 bouyer 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 <pthread.h>
32 #include <ucontext.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35
36 #include <atf-c.h>
37
38 #include "h_common.h"
39
40 #define STACKSIZE 65536
41
42 char stack[STACKSIZE];
43 ucontext_t nctx;
44 ucontext_t octx;
45 void *oself;
46 void *nself;
47 int val1, val2;
48
49 /* ARGSUSED0 */
50 static void
swapfunc(void * arg)51 swapfunc(void *arg)
52 {
53 /*
54 * If the test fails, we are very likely to crash
55 * without the opportunity to report
56 */
57 nself = (void *)pthread_self();
58 printf("after swapcontext self = %p\n", nself);
59
60 ATF_REQUIRE_EQ(oself, nself);
61 printf("Test succeeded\n");
62 /* Go back in main */
63 ATF_REQUIRE(swapcontext(&nctx, &octx));
64
65 /* NOTREACHED */
66 return;
67 }
68
69 /* ARGSUSED0 */
70 static void *
threadfunc(void * arg)71 threadfunc(void *arg)
72 {
73 nctx.uc_stack.ss_sp = stack;
74 nctx.uc_stack.ss_size = sizeof(stack);
75
76 makecontext(&nctx, (void *)*swapfunc, 0);
77
78 oself = (void *)pthread_self();
79 printf("before swapcontext self = %p\n", oself);
80 PTHREAD_REQUIRE(swapcontext(&octx, &nctx));
81
82 /* NOTREACHED */
83 return NULL;
84 }
85
86
87 ATF_TC(swapcontext1);
ATF_TC_HEAD(swapcontext1,tc)88 ATF_TC_HEAD(swapcontext1, tc)
89 {
90 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() "
91 "alters pthread_self()");
92 }
ATF_TC_BODY(swapcontext1,tc)93 ATF_TC_BODY(swapcontext1, tc)
94 {
95 pthread_t thread;
96
97 oself = (void *)&val1;
98 nself = (void *)&val2;
99
100 printf("Testing if swapcontext() alters pthread_self()\n");
101
102 PTHREAD_REQUIRE(getcontext(&nctx));
103 PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL));
104 PTHREAD_REQUIRE(pthread_join(thread, NULL));
105 }
106
ATF_TP_ADD_TCS(tp)107 ATF_TP_ADD_TCS(tp)
108 {
109 ATF_TP_ADD_TC(tp, swapcontext1);
110
111 return atf_no_error();
112 }
113