Bug #5241 ยป freebsd_map_stack.patch
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/*
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* FreeBSD require a first (i.e. addr) argument of mmap(2) is not NULL
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* if MAP_STACK is passed.
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* http://www.FreeBSD.org/cgi/query-pr.cgi?pr=158755
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*/
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#if defined(MAP_STACK) && !defined(__FreeBSD__)
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#if defined(MAP_STACK) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
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#define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON | MAP_STACK)
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#else
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#define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON)
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