1/* $NetBSD: t_swapcontext.c,v 1.9 2018/02/28 21:36:50 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: t_swapcontext.c,v 1.9 2018/02/28 21:36:50 uwe Exp $"); 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} 65 66/* ARGSUSED0 */ 67static void * 68threadfunc(void *arg) 69{ 70 nctx.uc_stack.ss_sp = stack; 71 nctx.uc_stack.ss_size = sizeof(stack); 72 nctx.uc_link = &octx; 73 74 makecontext(&nctx, swapfunc, 0); 75 76 oself = (void *)pthread_self(); 77 printf("before swapcontext self = %p\n", oself); 78 ATF_REQUIRE_MSG(swapcontext(&octx, &nctx) != -1, "swapcontext failed: %s", 79 strerror(errno)); 80 81 return NULL; 82} 83 84 85ATF_TC(swapcontext1); 86ATF_TC_HEAD(swapcontext1, tc) 87{ 88 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() " 89 "alters pthread_self()"); 90} 91ATF_TC_BODY(swapcontext1, tc) 92{ 93 pthread_t thread; 94 95 oself = (void *)&val1; 96 nself = (void *)&val2; 97 98 printf("Testing if swapcontext() alters pthread_self()\n"); 99 100 ATF_REQUIRE_MSG(getcontext(&nctx) != -1, "getcontext failed: %s", 101 strerror(errno)); 102 PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL)); 103 PTHREAD_REQUIRE(pthread_join(thread, NULL)); 104} 105 106ATF_TP_ADD_TCS(tp) 107{ 108 ATF_TP_ADD_TC(tp, swapcontext1); 109 110 return atf_no_error(); 111} 112