_rtld_expand_path
size_t n = _rtld_expand_path(buf, sizeof(buf), argv[0], p, ep);
size_t _rtld_expand_path(char *, size_t, const char *, const char *,
len = _rtld_expand_path(epath, sizeof(epath), execname, bp, ep);
size_t _rtld_expand_path(char *, size_t, const char *, const char *,\