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Subjectshared mmapping of /dev/zero

Hi,

I want to do a shared mmap of /dev/zero ind read/write mode but I get only
EINVAL. I used PROT_READ | PROT_WRITE (yes /dev/zero is opened read/write).
I use linux-1.3.97 and libc-5.3.12.

tia,
ron

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