int explain_dirfd_or_die(DIR *dir);
int explain_dirfd_on_error(DIR *dir);
DESCRIPTION
The explain_dirfd_or_die function is used to call the
dirfd(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_dirfd(3) function, and
then the process terminates by calling exit(EXIT_FAILURE).
The explain_dirfd_on_error function is used to call the
dirfd(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_dirfd(3) function, but
still returns to the caller.
dir
The dir, exactly as to be passed to the dirfd(3) system call.
RETURN VALUE
The explain_dirfd_or_die function only returns on success, see
dirfd(3) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_dirfd_on_error function always returns the value return
by the wrapped dirfd(3) system call.
EXAMPLE
The explain_dirfd_or_die function is intended to be used in a
fashion similar to the following example: