__waitpid not a cancellation point

[Ulrich Drepper]

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Roland McGrath wrote:
> Linuxthreads overrides waitpid but not __waitpid, so only the public name
> is a cancellation point.  It also overrides system, so that is made a
> cancellation point separately.  But it does not override popen/pclose,
> so those use __waitpid with no cancellation wrapper inside or out.
> Is this how it should be?

The standard does not require that functions which are implemented using 
other interfaces which are cancelation points must themselves be 
cancelation points.  I.e., the standard does not require a specific 
implementation.

This is what we should take advantage of.

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