1#define _GNU_SOURCE
 2#include <stdlib.h>
 3#include <unistd.h>
 4
 5static void dummy(char *old, char *new) {}
 6weak_alias(dummy, __env_rm_add);
 7
 8int clearenv()
 9{
10#ifdef __wasilibc_unmodified_upstream // Lazy environment variable init.
11#else
12// This specialized header is included within the function body to arranges for
13// the environment variables to be lazily initialized. It redefined `__environ`,
14// so don't remove or reorder it with respect to other code.
15#include "wasi/libc-environ-compat.h"
16#endif
17	char **e = __environ;
18	__environ = 0;
19	if (e) while (*e) __env_rm_add(*e++, 0);
20	return 0;
21}