#define _GNU_SOURCE

#include <dlfcn.h>
#include <string.h>
#include <sys/types.h>
#include <pwd.h>

char *username = "alice";

int getlogin_r(char *buf, size_t bufsize) {
    strncpy(buf, username, bufsize);
    return 0;
}

struct passwd *getpwuid(uid_t uid) {
    struct passwd *(*getpwuid)(uid_t) = dlsym(RTLD_NEXT, "getpwuid");
    struct passwd *pass = getpwuid(uid);
    pass->pw_name = username;
    return pass;
}