Re: suggestion for improvement to vfork() man page

+(However, on such systems,
+the preferred standard way of accomplishing the same result is to use
+.BR posix_spawn (3).)

I'm not sure I agree on this.  Linux posix_spawn()
calls fork() which for us is undesirable on MMU systems
due to the cost of copying large page tables.

To the extent that we would add support for non-MMU
platforms, we would stick with direct invocation of
vfork() even if the posix_spawn() on those targets
used vfork() instead of fork().  One less #ifdef,
of which we have far too many as it is.

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