[Bug 216922] bpf(4): opening already opened device returns EBUSY; not documented as supported error in open(2)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216922

            Bug ID: 216922
           Summary: bpf(4): opening already opened device returns EBUSY;
                    not documented as supported error in open(2)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

We have some code at $work that opens bpf(4) devices. It has to handle EBUSY
because of this line of code:
https://svnweb.freebsd.org/base/head/sys/net/bpf.c?annotate=303382#l869

It seems like there are 2 bugs, potentially:
- open(2) should note that behavior for character devices may vary from the
ERRORS section.
- bpf(4) returning EBUSY when the device is in use should be documented,
somewhere (maybe in bpf(9)?).

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