问如何最好地将全局计算在main中与动态加载的库共享？

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#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>

extern char **environ;

extern int g_common;

int main() {
    char *argv[2] = {"/bin/true", NULL};

    // SSCCE HACK: don't do this at home!
    // environ[0] is unimportant so we replace it
    environ[0] = "LD_PRELOAD=/tmp/foobar.so";

    g_common = 1;
    printf("main: g_common is %d\n", g_common);

    if (!fork())
        execve(*argv, argv, environ);
}

int g_common;

#include <stdio.h>

extern int g_common;

void init() {
    printf("foobar.so: g_common is %d\n", g_common);
}