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Re: Bogus ifdef guard in sys/null.h
Bernd Ernesti <netbsd%lists.veego.de@localhost> wrote:
> > POSIX says that both stddef.h and unistd.h shall provide NULL. This
> shall != must
> So not a mandatory requirement.
Apart from "shall" having a slightly stronger notation in English (and
commonly used in standards or legal texts as a synonym of "must"), POSIX
explicitly defines what "shall" means:
For an implementation that conforms to POSIX.1-2008, describes a
feature or behavior that is mandatory. An application can rely on
the existence of the feature or behavior.
For an application or user, describes a behavior that is mandatory.
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