115 lines
3 KiB
C
115 lines
3 KiB
C
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/* instrumented_alloc.c -- Memory allocation instrumented to fail when
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requested, for testing purposes.
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Copyright (C) 2018-2021 Free Software Foundation, Inc.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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(1) Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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(2) Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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(3) The name of the author may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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/* Include all the header files of alloc here, to make sure they're not
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processed when including alloc.c below, such that the redefinitions of malloc
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and realloc are only effective in alloc.c itself. This does not work for
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config.h, because it's not wrapped in "#ifndef CONFIG_H\n#define CONFIG_H"
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and "#endif" but that does not seem to be harmful. */
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#include "config.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <inttypes.h>
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#include "backtrace.h"
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#include "internal.h"
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extern void *instrumented_malloc (size_t size);
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extern void *instrumented_realloc (void *ptr, size_t size);
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#define malloc instrumented_malloc
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#define realloc instrumented_realloc
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#include "alloc.c"
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#undef malloc
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#undef realloc
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static uint64_t nr_allocs = 0;
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static uint64_t fail_at_alloc = 0;
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extern int at_fail_alloc_p (void);
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extern uint64_t get_nr_allocs (void);
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extern void set_fail_at_alloc (uint64_t);
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void *
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instrumented_malloc (size_t size)
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{
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void *res;
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if (at_fail_alloc_p ())
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return NULL;
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res = malloc (size);
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if (res != NULL)
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nr_allocs++;
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return res;
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}
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void *
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instrumented_realloc (void *ptr, size_t size)
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{
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void *res;
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if (size != 0)
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{
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if (at_fail_alloc_p ())
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return NULL;
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}
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res = realloc (ptr, size);
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if (res != NULL)
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nr_allocs++;
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return res;
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}
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int
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at_fail_alloc_p (void)
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{
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return fail_at_alloc == nr_allocs + 1;
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}
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uint64_t
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get_nr_allocs (void)
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{
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return nr_allocs;
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}
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void
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set_fail_at_alloc (uint64_t nr)
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{
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fail_at_alloc = nr;
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}
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