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      1 /* $NetBSD: h_atexit.c,v 1.1 2011/01/12 19:44:08 pgoyette Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code was contributed to The NetBSD Foundation by Jason R. Thorpe.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __COPYRIGHT("@(#) Copyright (c) 2011\
     33  The NetBSD Foundation, inc. All rights reserved.");
     34 __RCSID("$NetBSD: h_atexit.c,v 1.1 2011/01/12 19:44:08 pgoyette Exp $");
     35 
     36 #include <stdio.h>
     37 #include <stdlib.h>
     38 #include <signal.h>
     39 #include <string.h>
     40 #include <unistd.h>
     41 
     42 extern int __cxa_atexit(void (*func)(void *), void *, void *);
     43 extern void __cxa_finalize(void *);
     44 
     45 static int dso_handle_1;
     46 static int dso_handle_2;
     47 static int dso_handle_3;
     48 
     49 static int arg_1;
     50 static int arg_2;
     51 static int arg_3;
     52 
     53 static int exiting_state;
     54 
     55 #define	ASSERT(expr)							\
     56 do {									\
     57 	if ((expr) == 0) {						\
     58 		write(STDERR_FILENO, __func__, strlen(__func__));	\
     59 		write(STDERR_FILENO, ": ", 2);				\
     60 		write(STDERR_FILENO, __STRING(expr),			\
     61 		      strlen(__STRING(expr)));				\
     62 		write(STDERR_FILENO, "\n", 1);				\
     63 		my_abort();						\
     64 	}								\
     65 } while (/*CONSTCOND*/0)
     66 
     67 #define	SUCCESS()							\
     68 do {									\
     69 	write(STDOUT_FILENO, __func__, strlen(__func__));		\
     70 	write(STDOUT_FILENO, "\n", 1);					\
     71 } while (/*CONSTCOND*/0)
     72 
     73 static void
     74 my_abort(void)
     75 {
     76 
     77 	kill(getpid(), SIGABRT);
     78 	/* NOTREACHED */
     79 }
     80 
     81 static void
     82 cxa_handler_5(void *arg)
     83 {
     84 	static int cxa_handler_5_called;
     85 
     86 	ASSERT(arg == (void *)&arg_1);
     87 	ASSERT(cxa_handler_5_called == 0);
     88 	ASSERT(exiting_state == 5);
     89 
     90 	exiting_state--;
     91 	cxa_handler_5_called = 1;
     92 	SUCCESS();
     93 }
     94 
     95 static void
     96 cxa_handler_4(void *arg)
     97 {
     98 	static int cxa_handler_4_called;
     99 
    100 	ASSERT(arg == (void *)&arg_1);
    101 	ASSERT(cxa_handler_4_called == 0);
    102 	ASSERT(exiting_state == 4);
    103 
    104 	exiting_state--;
    105 	cxa_handler_4_called = 1;
    106 	SUCCESS();
    107 }
    108 
    109 static void
    110 cxa_handler_3(void *arg)
    111 {
    112 	static int cxa_handler_3_called;
    113 
    114 	ASSERT(arg == (void *)&arg_2);
    115 	ASSERT(cxa_handler_3_called == 0);
    116 	ASSERT(exiting_state == 3);
    117 
    118 	exiting_state--;
    119 	cxa_handler_3_called = 1;
    120 	SUCCESS();
    121 }
    122 
    123 static void
    124 cxa_handler_2(void *arg)
    125 {
    126 	static int cxa_handler_2_called;
    127 
    128 	ASSERT(arg == (void *)&arg_3);
    129 	ASSERT(cxa_handler_2_called == 0);
    130 	ASSERT(exiting_state == 2);
    131 
    132 	exiting_state--;
    133 	cxa_handler_2_called = 1;
    134 	SUCCESS();
    135 }
    136 
    137 static void
    138 normal_handler_1(void)
    139 {
    140 	static int normal_handler_1_called;
    141 
    142 	ASSERT(normal_handler_1_called == 0);
    143 	ASSERT(exiting_state == 1);
    144 
    145 	exiting_state--;
    146 	normal_handler_1_called = 1;
    147 	SUCCESS();
    148 }
    149 
    150 static void
    151 normal_handler_0(void)
    152 {
    153 	static int normal_handler_0_called;
    154 
    155 	ASSERT(normal_handler_0_called == 0);
    156 	ASSERT(exiting_state == 0);
    157 
    158 	normal_handler_0_called = 1;
    159 	SUCCESS();
    160 }
    161 
    162 int
    163 main(int argc, char *argv[])
    164 {
    165 
    166 	exiting_state = 5;
    167 
    168 	ASSERT(0 == atexit(normal_handler_0));
    169 	ASSERT(0 == atexit(normal_handler_1));
    170 	ASSERT(0 == __cxa_atexit(cxa_handler_4, &arg_1, &dso_handle_1));
    171 	ASSERT(0 == __cxa_atexit(cxa_handler_5, &arg_1, &dso_handle_1));
    172 	ASSERT(0 == __cxa_atexit(cxa_handler_3, &arg_2, &dso_handle_2));
    173 	ASSERT(0 == __cxa_atexit(cxa_handler_2, &arg_3, &dso_handle_3));
    174 
    175 	__cxa_finalize(&dso_handle_1);
    176 	__cxa_finalize(&dso_handle_2);
    177 	exit(0);
    178 }
    179