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/* Be paranoid. Check that we actually opened the /dev/null
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if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0
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|| __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
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#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR