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@dwbuiten dwbuiten/posixmemalign.c
Last active May 29, 2019

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/*
* posix_memalign wrapper with random failurres
*
* Copyright (c) 2013, Derek Buitenhuis
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#define LOADSYM(symbol) \
do { \
system_##symbol = dlsym(RTLD_NEXT, #symbol); \
if ((err = dlerror())) { \
fprintf(stdout, "Can't load "#symbol" symbol: %s\n", err); \
_exit(1); \
} \
} while(0)
int posix_memalign(void **memptr, size_t alignment, size_t size)
{
static time_t seed = 0;
static int prob = 0;
static uint64_t iteration = 0;
static int (* system_posix_memalign)(void **memptr, size_t alignment, size_t size) = NULL;
static void (* system_srand) (unsigned int seed) = NULL;
static int (* system_rand) (void) = NULL;
static char *(* system_getenv) (const char *name) = NULL;
static int (* system_atoi) (const char *str) = NULL;
int ret;
if (!system_posix_memalign) {
char *err;
dlerror();
LOADSYM(posix_memalign);
LOADSYM(srand);
LOADSYM(rand);
LOADSYM(getenv);
LOADSYM(atoi);
}
if (!seed) {
char *usertime = system_getenv("MALLOC_SEED");
if (!usertime)
seed = time(NULL);
else
seed = system_atoi(usertime);
system_srand(seed);
}
if (!prob) {
char *userprob = system_getenv("MALLOC_FAILPROB");
if (!userprob)
prob = 10000;
else
prob = system_atoi(userprob);
}
if (!(system_rand() % prob)) {
fprintf(stdout,
"FAILED. Iteration = %"PRId64", Seed = %lld.\n",
iteration, (long long) seed);
ret = 0;
} else {
ret = system_posix_memalign(memptr, alignment, size);
}
iteration++;
return ret;
}
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