open_or_die
int in_fd = open_or_die(src, O_RDONLY);
int subdir_dfd = open_or_die("subdir", O_DIRECTORY|O_RDONLY);
int subdir_dfd_ephemeral = open_or_die("subdir.ephemeral",
int dot_dfd = open_or_die(".", O_DIRECTORY|O_RDONLY);
int root_dfd = open_or_die("/", O_DIRECTORY|O_RDONLY);
int dot_dfd_path = open_or_die(".", O_DIRECTORY|O_RDONLY|O_PATH);
int dot_dfd_cloexec = open_or_die(".", O_DIRECTORY|O_RDONLY|O_CLOEXEC);
int fd = open_or_die("execveat", O_RDONLY);
int fd_path = open_or_die("execveat", O_RDONLY|O_PATH);
int fd_symlink = open_or_die("execveat.symlink", O_RDONLY);
int fd_denatured = open_or_die("execveat.denatured", O_RDONLY);
int fd_denatured_path = open_or_die("execveat.denatured",
int fd_script = open_or_die("script", O_RDONLY);
int fd_ephemeral = open_or_die("execveat.ephemeral", O_RDONLY);
int fd_ephemeral_path = open_or_die("execveat.path.ephemeral",
int fd_script_ephemeral = open_or_die("script.ephemeral", O_RDONLY);
int fd_cloexec = open_or_die("execveat", O_RDONLY|O_CLOEXEC);
int fd_script_cloexec = open_or_die("script", O_RDONLY|O_CLOEXEC);