Problem with large numbers of bpf devices

Dag-Erling Smorgrav des at
Sun Jun 8 15:06:11 PDT 2003

"Kevin Oberman" <oberman at> writes:
> A STABLE (not updated since 12/13/02) system shows very strange behavior
> for devices with a minor mode greater than 256. tcpdump does not work
> reliably and ls is, uh, "strange", using hex for the minor mode.

Minor numbers are traditionally 8-bit, but FreeBSD has 24-bit minor
numbers with a gap between the upper 16 and the lower 8.  ls(1) prints
8-bit minors in a format compatible with other unices, and uses the
incompatible hex format only for minors above 255.

Dag-Erling Smorgrav - des at

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