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/usr/lib/klibc/include/malloc.h is in libklibc-dev 1.5.25-1ubuntu2.

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/*
 * malloc.h
 *
 * Apparently people haven't caught on to use <stdlib.h>, which is the
 * standard place for this crap since the 1980's...
 */

#ifndef _MALLOC_H
#define _MALLOC_H

#include <klibc/extern.h>
#include <klibc/compiler.h>
#include <stddef.h>

__extern void free(void *);

__extern __mallocfunc void *malloc(size_t);
__extern __mallocfunc void *calloc(size_t, size_t);
__extern __mallocfunc void *realloc(void *, size_t);

#endif				/* _MALLOC_H */