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 #ifdef __FreeBSD__ 32 #include <sys/types.h> 33 #include <errno.h> 34 #include <string.h> 35 #endif 36 #include <pthread.h> 37 #include <ucontext.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 41 #include <atf-c.h> 42 43 #include "h_common.h" 44 45 #define STACKSIZE 65536 46 47 char stack[STACKSIZE]; 48 ucontext_t nctx; 49 ucontext_t octx; 50 void *oself; 51 void *nself; 52 int val1, val2; 53 54 /* ARGSUSED0 */ 55 static void 56 swapfunc(void *arg) 57 { 58 /* 59 * If the test fails, we are very likely to crash 60 * without the opportunity to report 61 */ 62 nself = (void *)pthread_self(); 63 printf("after swapcontext self = %p\n", nself); 64 65 ATF_REQUIRE_EQ(oself, nself); 66 printf("Test succeeded\n"); 67 /* Go back in main */ 68 ATF_REQUIRE(swapcontext(&nctx, &octx)); 69 70 /* NOTREACHED */ 71 return; 72 } 73 74 /* ARGSUSED0 */ 75 static void * 76 threadfunc(void *arg) 77 { 78 nctx.uc_stack.ss_sp = stack; 79 nctx.uc_stack.ss_size = sizeof(stack); 80 81 makecontext(&nctx, (void *)*swapfunc, 0); 82 83 oself = (void *)pthread_self(); 84 printf("before swapcontext self = %p\n", oself); 85 #ifdef __FreeBSD__ 86 ATF_REQUIRE_MSG(swapcontext(&octx, &nctx) != -1, "swapcontext failed: %s", 87 strerror(errno)); 88 #else 89 PTHREAD_REQUIRE(swapcontext(&octx, &nctx)); 90 #endif 91 92 /* NOTREACHED */ 93 return NULL; 94 } 95 96 97 ATF_TC(swapcontext1); 98 ATF_TC_HEAD(swapcontext1, tc) 99 { 100 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() " 101 "alters pthread_self()"); 102 } 103 ATF_TC_BODY(swapcontext1, tc) 104 { 105 pthread_t thread; 106 107 #if defined(__FreeBSD__) && defined(__mips__) 108 /* 109 * MIPS modifies TLS pointer in set_mcontext(), so 110 * swapping contexts obtained from different threads 111 * gives us different pthread_self() return value. 112 */ 113 atf_tc_skip("Platform is not supported."); 114 #endif 115 116 oself = (void *)&val1; 117 nself = (void *)&val2; 118 119 printf("Testing if swapcontext() alters pthread_self()\n"); 120 121 #ifdef __FreeBSD__ 122 ATF_REQUIRE_MSG(getcontext(&nctx) != -1, "getcontext failed: %s", 123 strerror(errno)); 124 #else 125 PTHREAD_REQUIRE(getcontext(&nctx)); 126 #endif 127 PTHREAD_REQUIRE(pthread_create(&thread, NULL, threadfunc, NULL)); 128 PTHREAD_REQUIRE(pthread_join(thread, NULL)); 129 } 130 131 ATF_TP_ADD_TCS(tp) 132 { 133 ATF_TP_ADD_TC(tp, swapcontext1); 134 135 return atf_no_error(); 136 } 137