mmap() return value when length == 0

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hello,

on linux (2.4.9 and 2.2.18), the mmap() syscall will return NULL if the
length argument is 0 rather than returning MAP_FAILED (-1). this is
different than both solaris and hp-ux, and the linux man page doesn't
indicate that it should do this.

so, is this indeed the desired behaviour or a longstanding bug?

thanks,
jacob

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