Date: Mon, 29 Jul 2019 13:04:05 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Yuri <yuri@rawbw.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Is there an way for a program to know when the list of network interfaces has changed (without rescanning them)? Message-ID: <4c60eb9c-2947-1d2b-3c65-8b87201a0487@grosbein.net> In-Reply-To: <de8fe1fc-81a1-80f3-82e5-1ec41f639b63@rawbw.com> References: <de8fe1fc-81a1-80f3-82e5-1ec41f639b63@rawbw.com>
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29.07.2019 12:35, Yuri wrote:
> I am asking because wireshark doesn't sense the interface list changes, and it just always shows the list from the time it was launched .
There is a way as we have devd(8) reading kernel-generated events and running commands in response.
Look at default /etc/devd.conf rules for example:
notify 0 {
match "system" "IFNET";
match "subsystem" "!(usbus|wlan)[0-9]+";
match "type" "ATTACH";
action "/etc/pccard_ether $subsystem start";
};
Quoting devd(8) manual page:
> Since devctl(4) allows only one active reader, devd multiplexes it,
> forwarding all events to any number of connected clients. Clients
> connect by opening the SOCK_SEQPACKET UNIX domain socket at
> /var/run/devd.seqpacket.pipe.
We have bsnmpd(1) in base system and its module usr.sbin/bsnmpd/modules/snmp_hostres
acting as client of devd, for example.
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