Dear Michael Kerrisk,
in my application I am using munlock() as described in the man page. munlock()
fails and returns ENOMEM. The man page for this error has not helped me to find
out what the problem was. I traced my code and discovered that this error
appears when "the process's maximum number of mappings would have been
exceeded", as it is mentioned at the man page of mmap(). This happens because
munlock() splits the vma's.
I believe that this information should be a part of the man page of munlock().
-- 
Met vriendelijke groet/Kind regards
Mehdi Aqadjani Memar
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