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