The explain_adjtime_or_die function is used to call the
adjtime(2) system call. On failure an explanation will be printed
to stderr, obtained from the explain_adjtime(3) function,
and then the process terminates by calling exit(EXIT_FAILURE).
The explain_adjtime_on_error function is used to call the
adjtime(2) system call. On failure an explanation will be printed
to stderr, obtained from the explain_adjtime(3) function,
but still returns to the caller.
delta
The delta, exactly as to be passed to the adjtime(2) system call.
olddelta
The olddelta, exactly as to be passed to the adjtime(2) system
call.
RETURN VALUE
The explain_adjtime_or_die function only returns on success, see
adjtime(2) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_adjtime_on_error function always returns the value
return by the wrapped adjtime(2) system call.
EXAMPLE
The explain_adjtime_or_die function is intended to be used in a
fashion similar to the following example: