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