yumkam@gmail.com (Yuriy M. Kaminskiy)
writes:

> Ruediger Meier <sweet_f_a@gmx.de> writes:
>
>> From: Ruediger Meier <ruediger.meier@ga-group.nl>
>>
[...]
> `O_CREAT`, etc; most notable, `O_CLOEXEC`; however, if `O_CLOEXEC` is missing
> on system, "c.h" defines it as 0, so it is silently ignored on those
> systems, instead of being emulated; so, whenever it matters, callers
> must call **both** `open(O_CLOEXEC)` and `fcntl(F_SETFD,FD_CLOEXEC)`]).

... something like attached below. In some cases it is maybe
unnecessary, but better safe than sorry.