[PATCH] [BZ #18433] Check file access/existence before forking.

[Roland McGrath]

That article talks about the complications of using vfork with standard
library interfaces.  That is not directly relevant to using vfork in the
implementation of the library.  The vfork semantics raise subtle issues and
great care needs to be taken when using it, but the article you cited is
not really relevant to implementation choices here.