114 lines
3 KiB
C
114 lines
3 KiB
C
/* instrumented_alloc.c -- Memory allocation instrumented to fail when
|
|
requested, for testing purposes.
|
|
Copyright (C) 2018-2021 Free Software Foundation, Inc.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
(1) Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
(2) 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.
|
|
|
|
(3) The name of the author may not be used to
|
|
endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */
|
|
|
|
/* Include all the header files of alloc here, to make sure they're not
|
|
processed when including alloc.c below, such that the redefinitions of malloc
|
|
and realloc are only effective in alloc.c itself. This does not work for
|
|
config.h, because it's not wrapped in "#ifndef CONFIG_H\n#define CONFIG_H"
|
|
and "#endif" but that does not seem to be harmful. */
|
|
|
|
#include "config.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <inttypes.h>
|
|
|
|
#include "backtrace.h"
|
|
#include "internal.h"
|
|
|
|
extern void *instrumented_malloc (size_t size);
|
|
extern void *instrumented_realloc (void *ptr, size_t size);
|
|
|
|
#define malloc instrumented_malloc
|
|
#define realloc instrumented_realloc
|
|
#include "alloc.c"
|
|
#undef malloc
|
|
#undef realloc
|
|
|
|
static uint64_t nr_allocs = 0;
|
|
static uint64_t fail_at_alloc = 0;
|
|
|
|
extern int at_fail_alloc_p (void);
|
|
extern uint64_t get_nr_allocs (void);
|
|
extern void set_fail_at_alloc (uint64_t);
|
|
|
|
void *
|
|
instrumented_malloc (size_t size)
|
|
{
|
|
void *res;
|
|
|
|
if (at_fail_alloc_p ())
|
|
return NULL;
|
|
|
|
res = malloc (size);
|
|
if (res != NULL)
|
|
nr_allocs++;
|
|
|
|
return res;
|
|
}
|
|
|
|
void *
|
|
instrumented_realloc (void *ptr, size_t size)
|
|
{
|
|
void *res;
|
|
|
|
if (size != 0)
|
|
{
|
|
if (at_fail_alloc_p ())
|
|
return NULL;
|
|
}
|
|
|
|
res = realloc (ptr, size);
|
|
if (res != NULL)
|
|
nr_allocs++;
|
|
|
|
return res;
|
|
}
|
|
|
|
int
|
|
at_fail_alloc_p (void)
|
|
{
|
|
return fail_at_alloc == nr_allocs + 1;
|
|
}
|
|
|
|
uint64_t
|
|
get_nr_allocs (void)
|
|
{
|
|
return nr_allocs;
|
|
}
|
|
|
|
void
|
|
set_fail_at_alloc (uint64_t nr)
|
|
{
|
|
fail_at_alloc = nr;
|
|
}
|