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/usr/include/x86_64-linux-musl/malloc.h is in musl-dev 1.1.19-1.

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#ifndef _MALLOC_H
#define _MALLOC_H

#ifdef __cplusplus
extern "C" {
#endif

#define __NEED_size_t

#include <bits/alltypes.h>

void *malloc (size_t);
void *calloc (size_t, size_t);
void *realloc (void *, size_t);
void free (void *);
void *valloc (size_t);
void *memalign(size_t, size_t);

size_t malloc_usable_size(void *);

#ifdef __cplusplus
}
#endif

#endif