1#include <unistd.h>
 2#include <stdlib.h>
 3#include <sysexits.h>
 4#include <wasi/api.h>
 5#include <wasi/libc.h>
 6#include <wasi/libc-environ.h>
 7
 8// If the program does use `environ`, it'll get this version of
 9// `__wasilibc_environ`, which is initialized with a constructor function, so
10// that it's initialized whenever user code might want to access it.
11char **__wasilibc_environ;
12weak_alias(__wasilibc_environ, _environ);
13weak_alias(__wasilibc_environ, environ);
14
15// We define this function here in the same source file as
16// `__wasilibc_environ`, so that this function is called in iff environment
17// variable support is used.
18// Concerning the 50 -- levels up to 100 are reserved for the implementation,
19// so we an arbitrary number in the middle of the range to allow other
20// reserved things to go before or after.
21__attribute__((constructor(50)))
22static void __wasilibc_initialize_environ_eagerly(void) {
23    __wasilibc_initialize_environ();
24}
25
26// See the comments in libc-environ.h.
27void __wasilibc_maybe_reinitialize_environ_eagerly(void) {
28    // This translation unit is linked in if `environ` is used, meaning we need
29    // to eagerly reinitialize the environment variables.
30    __wasilibc_initialize_environ();
31}