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 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 * 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); 88 ATF_TC_HEAD(swapcontext1, tc) 89 { 90 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() " 91 "alters pthread_self()"); 92 } 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 } 106 107 ATF_TP_ADD_TCS(tp) 108 { 109 ATF_TP_ADD_TC(tp, swapcontext1); 110 111 return atf_no_error(); 112 } 113