/*
* Copyright 2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* setjmp.c -- example illustrating an issue with indeterminate value
* of non-volatile automatic variables after transaction abort.
* See libpmemobj(3) for details.
*
* NOTE: To observe the problem (likely segfault on a second call to free()),
* the example program should be compiled with optimizations enabled (-O2).
*/
#include <stdlib.h>
#include <stdio.h>
#include <libpmemobj.h>
/* name of our layout in the pool */
#define LAYOUT_NAME "setjmp_example"
int
main(int argc, const char *argv[])
{
const char path[] = "/pmem-fs/myfile";
PMEMobjpool *pop;
/* create the pmemobj pool */
pop = pmemobj_create(path, LAYOUT_NAME, PMEMOBJ_MIN_POOL, 0666);
if (pop == NULL) {
perror(path);
exit(1);
}
/* initialize pointer variables with invalid addresses */
int *bad_example_1 = (int *)0xBAADF00D;
int *bad_example_2 = (int *)0xBAADF00D;
int *bad_example_3 = (int *)0xBAADF00D;
int *volatile good_example = (int *)0xBAADF00D;
TX_BEGIN(pop) {
bad_example_1 = malloc(sizeof(int));
bad_example_2 = malloc(sizeof(int));
bad_example_3 = malloc(sizeof(int));
good_example = malloc(sizeof(int));
/* manual or library abort called here */
pmemobj_tx_abort(EINVAL);
} TX_ONCOMMIT {
/*
* This section is longjmp-safe
*/
} TX_ONABORT {
/*
* This section is not longjmp-safe
*/
free(good_example); /* OK */
free(bad_example_1); /* undefined behavior */
} TX_FINALLY {
/*
* This section is not longjmp-safe on transaction abort only
*/
free(bad_example_2); /* undefined behavior */
} TX_END
free(bad_example_3); /* undefined behavior */
pmemobj_close(pop);
}