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Diffstat (limited to 'share/man/man9/bpf.9')
| -rw-r--r-- | share/man/man9/bpf.9 | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/share/man/man9/bpf.9 b/share/man/man9/bpf.9 index 5a3ac07..ebf26cb 100644 --- a/share/man/man9/bpf.9 +++ b/share/man/man9/bpf.9 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd December 13, 2006 +.Dd May 11, 2012 .Dt BPF 9 .Os .\" @@ -246,9 +246,31 @@ The function returns 0 when the program is not a valid filter program. .\" +.Sh EVENT HANDLERS +.Nm +invokes +.Fa bpf_track +.Xr EVENTHANDLER 9 +event each time listener attaches to or detaches from an interface. +Pointer to +.Pq Vt "struct ifnet *" +is passed as the first argument, interface +.Fa dlt +follows. Last argument indicates listener is attached (1) or +detached (0). +Note that handler is invoked with +.Nm +global lock held, which implies restriction on sleeping and calling +.Nm +subsystem inside +.Xr EVENTHANDLER 9 +dispatcher. +Note that handler is not called for write-only listeners. +.\" .Sh SEE ALSO .Xr tcpdump 1 , -.Xr bpf 4 +.Xr bpf 4 , +.Xr EVENTHANDLER 9 .\" .Sh HISTORY The Enet packet filter was created in 1980 by Mike Accetta and |
