发现FreeBSD4.8的manual 有错!

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2.      BIOS_VADDRTOPADDR()   Returns the effective physical address which corre-
3.                            sponds to the kernel virtual address addr.
4.                                                                                 
5.      BIOS_VADDRTOPADDR()   Returns the kernel virtual address which corre-
6.                            sponds to the effective physical address addr.

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上面那函数应该是：
BIOS_PADDRTOPADDR()

好象又不是，有空看看man 9 bios

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2.      The packet filter appears as a character special device, /dev/bpf0,
3.      /dev/bpf1, etc.  After opening the device, the file descriptor must be
4.      bound to a specific network interface with the [size=5]BIOCSETIF[/size] ioctl.  A given
5.      interface can be shared by multiple listeners, and the filter underlying
6.      each descriptor will see an identical packet stream.

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没有BIOCSETIF :confused: :rolleyes:
grep -R SIOCSETIF /usr/include|grep define